1. A vent valve, comprising:

the valve comprises a valve body, a valve body and a valve body, wherein the valve body is provided with an inner cavity extending along a first direction, two ends of the valve body are provided with openings communicated with the inner cavity along the first direction, and the inner cavity is provided with a center line extending along the first direction;

a plurality of damper blades disposed circumferentially around the centerline and located within the internal cavity, each of the damper blades having a rotational axis, the rotational axis of each of the damper blades being perpendicular to the centerline;

the transmission mechanism is arranged outside the inner cavity of the valve body, and each air valve blade is connected with the transmission mechanism;

the driving device is arranged outside the inner cavity of the valve body and connected with the transmission mechanism, and the driving device is used for driving the transmission mechanism so that the transmission mechanism drives each air valve blade to synchronously rotate around a respective rotating shaft, and the ventilation valve is switched between a closed state and an open state; wherein the content of the first and second substances,

in the closed state, side ends of the adjacent air valve blades are attached to each other, the side ends extend in a radial direction, and the radial direction is perpendicular to the first direction;

in the open state, side ends of adjacent damper blades are separated.

2. A vent valve according to claim 1, wherein the actuator drives each of the damper blades to rotate synchronously through the same angle about the respective pivot axis to switch the vent valve between the closed and open positions.

3. A vent valve according to claim 1 or 2, wherein the transmission mechanism comprises:

the primary transmission part is annular, is sleeved on the outer surface of the valve body and is connected with the driving device;

the secondary transmission parts are in one-to-one correspondence with the air valve blades, and each secondary transmission part is connected with the rotating shaft of the corresponding air valve blade and is connected with the primary transmission part;

the driving device is used for driving the primary transmission parts to rotate forwards or reversely along the circumferential direction so as to synchronously drive each secondary transmission part, so that each secondary transmission part drives the corresponding air valve blade to rotate forwards or reversely around the respective rotating shaft;

in the process that the primary transmission part rotates in the circumferential direction, the vent valve is switched from the closed state to the open state;

and in the process that the primary transmission part rotates along the circumferential direction in the reverse direction, the ventilation valve is switched from the opening state to the closing state.

4. The vent valve according to claim 3, wherein the primary driving portion is a driving ring, the secondary driving portion is a blade lever, one end of the blade lever is rotatably connected to the driving ring, the other end of the blade lever is fixedly connected to the rotating shaft of the vane of the air valve, and the other end of each blade lever can swing around the connecting point of the rotating shaft and the blade lever.

5. The vent valve according to claim 4, wherein the outer peripheral surface of the driving ring is provided with a plurality of first protrusions corresponding to the plurality of blade levers one to one, the one end of the blade lever is provided with a first through hole extending along the extending direction of the blade lever, and the first protrusions corresponding to the blade lever are engaged with the first through hole and can move along the hole wall of the first through hole.

6. The vent valve according to claim 3, wherein the primary transmission portion is a transmission ring, the secondary transmission portion comprises a connecting rod and a rocker, one end of the connecting rod is rotatably connected with the transmission ring, the other end of the connecting rod is rotatably connected with one end of the rocker, and the other end of the rocker is fixedly connected with the rotating shaft of the air valve blade.

7. A vent valve as defined in claim 4 or 6, further comprising: one end of the driving deflector rod is rotatably connected with the transmission ring, and the other end of the driving deflector rod is fixedly connected with the driving device; the driving device is used for driving the driving deflector rod to swing forwards or backwards so as to drive the transmission ring to rotate forwards or backwards along the circumferential direction.

8. The vent valve according to claim 7, wherein the outer peripheral surface of the driving ring is provided with a second protrusion corresponding to the driver, the one end of the driver is provided with a second through hole extending along the extending direction of the driver, and the second protrusion is engaged with the second through hole and can move along the hole wall of the second through hole.

9. The vent valve according to claim 3, wherein the primary transmission portion is a gear plate, and teeth are provided at one end of the gear plate in the first direction, the teeth being distributed along the circumferential direction; the secondary transmission part is a blade gear, and the blade gear is fixedly connected with a rotating shaft of the air valve blade and meshed with the teeth of the gear disc.

10. A vent valve as defined in claim 9, further comprising: and the driving gear is fixedly connected with the driving device and is meshed with the teeth of the gear disc, and the driving device is used for driving the driving gear to rotate forwards or reversely so as to drive the gear disc to rotate forwards or reversely along the circumferential direction.

11. A vent valve according to any of claims 1 to 10, wherein in the closed state, in the first direction, each of the damper blades comprises a front side and a back side, the front side of the side end of one side of the damper blade is provided with a first V-shaped configuration, and the back side of the side end of the other side of the damper blade is provided with a second V-shaped configuration;

the wind valve blade comprises a first V-shaped structure and a second V-shaped structure, wherein the first V-shaped structure and the second V-shaped structure are adjacent to each other, the outer edge of the first V-shaped structure is located in the second V-shaped structure, and the outer edge of the second V-shaped structure is located in the first V-shaped structure.

12. The vent valve of claim 11, wherein the first V-shaped structure comprises a first surface and a second surface connected, the first surface of the first V-shaped structure being closer to an outer edge of the first V-shaped structure than the second surface;

the second V-shaped structure comprises a first surface and a second surface which are connected, and the first surface of the second V-shaped structure is closer to the outer edge of the second V-shaped structure than the second surface;

in the closed state, the first surface of the first V-shaped structure and the first surface of the second V-shaped structure of the adjacent air valve blade are attached to each other.

13. The vent valve of claim 11, wherein the outer edges of the first V-shaped structure are of a rounded design and the outer edges of the second V-shaped structure are of a rounded design.

14. A vent valve according to claim 11, wherein, in the first orientation, the opening of the first V-shaped structure is disposed upwardly and the opening of the second V-shaped structure is disposed downwardly.

15. A vent valve as defined in any of claims 1 to 14, further comprising: the supporting part is arranged at the center of the inner cavity of the valve body, the central line penetrates through the supporting part, one end of the rotating shaft of each air valve blade is rotatably supported on the supporting part, and the other end of the rotating shaft is fixedly connected with the transmission mechanism.

16. The vent valve of claim 15, wherein the support portion comprises an upper bowl cover and a lower bowl cover that interface in the first direction, the upper bowl cover and the lower bowl cover interface to form a plurality of pivot support holes spaced apart along the circumferential direction, the one end of the pivot being supported in the pivot support holes.

17. A ventilation valve as claimed in any one of claims 1 to 16, wherein a plurality of impeller air volume meters are further provided in the interior chamber of the valve body, each impeller air volume meter comprising:

a rotating portion rotatable in the circumferential direction;

the device comprises a shell, a first shaft seat and a second shaft seat, wherein the shell is provided with the first shaft seat and the second shaft seat which are distributed at intervals along a first direction;

the sharp shaft extends along the first direction, the sharp shaft is positioned in the shell, a shaft hole of the rotating part is sleeved on the sharp shaft, the sharp shaft and the rotating part coaxially rotate, two tip ends of the sharp shaft are respectively arranged on the first shaft seat and the second shaft seat, and a bearing is not arranged between the shaft hole of the rotating part and the sharp shaft;

and a plurality of impeller blades provided on an outer peripheral surface of the rotating portion at intervals in the circumferential direction.

18. The vent valve of claim 17, wherein each of the impeller vanes includes a first portion and a second portion, the first portion being connected to the rotating portion; wherein, along a second direction, the width of the first portion gradually increases, the width of the second portion is equal, the maximum width of the first portion is equal to the width of the second portion, and the second direction is a direction from the first portion to the second portion.

19. The vent valve of claim 18, wherein the first section has a length of L1 and the second section has a length of L2, wherein 0.45 ≦ L2/(L1+ L2) ≦ 0.6.

20. The vent valve of claim 18, wherein the first section has an area of S1 and the second section has an area of S2, wherein 1.2 ≦ S2/S1 ≦ 1.5.

21. A vent valve according to claim 18, wherein each of the impeller vanes is angled from horizontal by an angle α of 30 ° to 45 °.

22. The vent valve of claim 18, wherein the diameter of the rotating portion is D1, and the outer diameter of the integral structure formed by the rotating portion and the plurality of impeller vanes is D2, 2 ≦ D2/D1 ≦ 4.

23. The vent valve of claim 17, wherein the second bearing above the spike shaft in the first direction is an adjustment screw that is threadably coupled to the housing to adjust a distance between the adjustment screw and the first bearing.

24. A vent valve according to any of claims 1 to 23, wherein the drive means is an electric motor.

25. A vent valve according to any of claims 1 to 23, wherein the damper blade is fan-shaped.

Background

The ventilation valve is a regulating valve with simple structure and wide application, can be applied to ventilation and environmental protection engineering in various industries such as chemical industry, building materials, power stations and the like, and is used as a control device for regulating or cutting off the flow of a gas medium.

Existing vent valves typically include a valve body and a plurality of vanes disposed within the valve body. Usually, a gear mechanism is arranged in the center of the valve body, and the driving device of the valve body drives the gear mechanism to rotate the blades. Since the gear transmission mechanism is arranged at the central position of the valve body, a certain internal space of the valve body can be occupied.

Disclosure of Invention

The invention aims to solve the technical problem that the internal space of the valve body of the ventilation valve is occupied by a transmission mechanism. The invention provides a ventilation valve which is provided with an external transmission mechanism, namely, the transmission mechanism is moved outwards, and the occupied space of the central position of an air valve is reduced. Especially for a small-caliber air valve, the flow area is effectively increased.

In order to solve the above technical problem, an embodiment of the present invention discloses a vent valve, including: the valve comprises a valve body, a valve body and a valve body, wherein the valve body is provided with an inner cavity extending along a first direction, two ends of the valve body are provided with openings communicated with the inner cavity along the first direction, and the inner cavity is provided with a center line extending along the first direction; a plurality of damper blades disposed circumferentially around the centerline and located within the internal cavity, each of the damper blades having a rotational axis, the rotational axis of each of the damper blades being perpendicular to the centerline; the transmission mechanism is arranged outside the inner cavity of the valve body, and each air valve blade is connected with the transmission mechanism; the driving device is arranged outside the inner cavity of the valve body and connected with the transmission mechanism, and the driving device is used for driving the transmission mechanism so that the transmission mechanism drives each air valve blade to synchronously rotate around a respective rotating shaft, and the ventilation valve is switched between a closed state and an open state; wherein, in the closed state, side ends of adjacent damper blades are attached to each other, the side ends extend in a radial direction, and the radial direction is perpendicular to the first direction; in the open state, side ends of adjacent damper blades are separated.

By adopting the technical scheme, the ventilation valve is provided with the outer transmission mechanism, namely the transmission mechanism is moved outwards, and the occupied space of the central position of the air valve is reduced. Especially for a small-caliber air valve, the flow area is effectively increased.

According to another embodiment of the present invention, the transmission mechanism drives each of the air valve blades to rotate synchronously by the same angle around the respective rotating shaft, so as to switch the ventilation valve between the closed state and the open state.

According to another embodiment of the invention, the transmission mechanism comprises:

the primary transmission part is annular, is sleeved on the outer surface of the valve body and is connected with the driving device;

the secondary transmission parts are in one-to-one correspondence with the air valve blades, and each secondary transmission part is connected with the rotating shaft of the corresponding air valve blade and is connected with the primary transmission part;

the driving device is used for driving the primary transmission parts to rotate forwards or reversely along the circumferential direction so as to synchronously drive each secondary transmission part, so that each secondary transmission part drives the corresponding air valve blade to rotate forwards or reversely around the respective rotating shaft;

in the process that the primary transmission part rotates in the circumferential direction, the vent valve is switched from the closed state to the open state;

and in the process that the primary transmission part rotates along the circumferential direction in the reverse direction, the ventilation valve is switched from the opening state to the closing state.

According to another specific embodiment of the present invention, the primary transmission portion is a transmission ring, the secondary transmission portion is a blade shift lever, one end of the blade shift lever is rotatably connected to the transmission ring, the other end of the blade shift lever is fixedly connected to the rotating shaft of the vane of the air valve, and the other end of each blade shift lever can swing with a connection point of the rotating shaft and the blade shift lever as a fulcrum.

According to another specific embodiment of the present invention, the outer peripheral surface of the driving ring is provided with a plurality of first protrusions corresponding to the plurality of blade shift levers one to one, the one end of the blade shift lever is provided with a first through hole extending along the extending direction of the blade shift lever, and the first protrusions corresponding to the blade shift lever are clamped in the first through hole and can move along the hole wall of the first through hole.

According to another specific embodiment of the invention, the primary transmission part is a transmission ring, the secondary transmission part comprises a connecting rod and a rocker, one end of the connecting rod is rotatably connected with the transmission ring, the other end of the connecting rod is rotatably connected with one end of the rocker, and the other end of the rocker is fixedly connected with a rotating shaft of the air valve blade.

According to another embodiment of the present invention, the method further comprises: one end of the driving deflector rod is rotatably connected with the transmission ring, and the other end of the driving deflector rod is fixedly connected with the driving device; the driving device is used for driving the driving deflector rod to swing forwards or backwards so as to drive the transmission ring to rotate forwards or backwards along the circumferential direction.

According to another specific embodiment of the present invention, a second protrusion corresponding to the driving lever is disposed on an outer circumferential surface of the driving ring, a second through hole extending along an extending direction of the driving lever is disposed at the one end of the driving lever, and the second protrusion is engaged with the second through hole and is capable of moving along a hole wall of the second through hole.

According to another specific embodiment of the present invention, the primary transmission part is a gear plate, and one end of the gear plate in the first direction is provided with teeth distributed along the circumferential direction; the secondary transmission part is a blade gear, and the blade gear is fixedly connected with a rotating shaft of the air valve blade and meshed with the teeth of the gear disc.

According to another embodiment of the present invention, the method further comprises: and the driving gear is fixedly connected with the driving device and is meshed with the teeth of the gear disc, and the driving device is used for driving the driving gear to rotate forwards or reversely so as to drive the gear disc to rotate forwards or reversely along the circumferential direction.

According to another embodiment of the present invention, in the closed state, along the first direction, each of the damper blades includes a front surface and a back surface, the front surface of the side end of one side of the damper blade is provided with a first V-shaped structure, and the back surface of the side end of the other side of the damper blade is provided with a second V-shaped structure;

the wind valve blade comprises a first V-shaped structure and a second V-shaped structure, wherein the first V-shaped structure and the second V-shaped structure are adjacent to each other, the outer edge of the first V-shaped structure is located in the second V-shaped structure, and the outer edge of the second V-shaped structure is located in the first V-shaped structure.

According to another embodiment of the present invention, the first V-shaped structure comprises a first surface and a second surface connected, the first surface of the first V-shaped structure being closer to an outer edge of the first V-shaped structure than the second surface;

the second V-shaped structure comprises a first surface and a second surface which are connected, and the first surface of the second V-shaped structure is closer to the outer edge of the second V-shaped structure than the second surface;

in the closed state, the first surface of the first V-shaped structure and the first surface of the second V-shaped structure of the adjacent air valve blade are attached to each other.

According to another embodiment of the present invention, the outer edge of the first V-shaped structure is of a rounded design and the outer edge of the second V-shaped structure is of a rounded design.

According to another embodiment of the present invention, along the first direction, the opening of the first V-shaped structure is disposed upward, and the opening of the second V-shaped structure is disposed downward.

According to another embodiment of the present invention, the method further comprises: the supporting part is arranged at the center of the inner cavity of the valve body, the central line penetrates through the supporting part, one end of the rotating shaft of each air valve blade is rotatably supported on the supporting part, and the other end of the rotating shaft is fixedly connected with the transmission mechanism.

According to another specific embodiment of the present invention, the supporting portion includes an upper bowl cover and a lower bowl cover which are butted in the first direction, the upper bowl cover and the lower bowl cover are butted to form a plurality of rotating shaft supporting holes which are distributed at intervals in the circumferential direction, and the one end of the rotating shaft is supported in the rotating shaft supporting holes.

According to another specific embodiment of the present invention, a plurality of impeller type air volume meters are further disposed in the inner cavity of the valve body, each impeller type air volume meter comprising:

a rotating portion rotatable in the circumferential direction;

the device comprises a shell, a first shaft seat and a second shaft seat, wherein the shell is provided with the first shaft seat and the second shaft seat which are distributed at intervals along a first direction;

the sharp shaft extends along the first direction, the sharp shaft is positioned in the shell, a shaft hole of the rotating part is sleeved on the sharp shaft, the sharp shaft and the rotating part coaxially rotate, two tip ends of the sharp shaft are respectively arranged on the first shaft seat and the second shaft seat, and a bearing is not arranged between the shaft hole of the rotating part and the sharp shaft;

and a plurality of impeller blades provided on an outer peripheral surface of the rotating portion at intervals in the circumferential direction.

According to another embodiment of the invention, each of the impeller blades comprises a first portion and a second portion, the first portion being connected to the rotating portion; wherein the content of the first and second substances,

the width of the first part is gradually increased along a second direction, the width of the second part is equal, the maximum width of the first part is equal to the width of the second part, and the second direction is a direction from the first part to the second part.

According to another embodiment of the invention, the length of the first fraction is L1 and the length of the second fraction is L2, wherein 0.45. ltoreq. L2/(L1+ L2). ltoreq.0.6.

According to another embodiment of the present invention, the area of the first portion is S1 and the area of the second portion is S2, wherein 1.2 ≦ S2/S1 ≦ 1.5.

According to another embodiment of the invention, each of the impeller blades has an angle α with the horizontal direction, which is 30 ° or more and 45 ° or less.

According to another embodiment of the invention, the diameter of the rotating part is D1, and the outer diameter of the integral structure formed by the rotating part and the impeller blades is D2, 2 ≦ D2/D1 ≦ 4.

According to another specific embodiment of the present invention, along the first direction, the second shaft seat located above the pointed shaft is an adjusting screw, and the adjusting screw is in threaded connection with the housing to adjust a distance between the adjusting screw and the first shaft seat.

According to another embodiment of the invention, the drive means is an electric motor.

According to another embodiment of the invention, the damper blade is fan-shaped.

Drawings

FIG. 1 shows a first perspective view of a vent valve according to an embodiment of the present invention;

FIG. 2 shows a second perspective view of a vent valve in accordance with an embodiment of the present invention;

FIG. 3 shows a first perspective view of a vane in a vent valve according to an embodiment of the invention;

FIG. 4 shows a second perspective view of a vane in the vent valve of an embodiment of the present invention;

FIG. 5 shows a third perspective view of a vent valve according to an embodiment of the present invention;

FIG. 6 shows a fourth perspective view of a vent valve according to an embodiment of the present invention;

FIG. 7 shows a fifth perspective view of a vent valve according to an embodiment of the present invention;

FIG. 8 shows a sixth perspective view of a vent valve according to an embodiment of the present invention;

FIG. 9 shows a seventh perspective view of a vent valve according to an embodiment of the present invention;

FIG. 10 shows a perspective view eight of a vent valve according to an embodiment of the invention;

FIG. 11 shows a ninth perspective view of a vent valve in accordance with an embodiment of the present invention;

FIG. 12 shows a perspective view ten of a vent valve of an embodiment of the present invention;

FIG. 13 shows an eleventh perspective view of a vent valve in accordance with an embodiment of the present invention;

fig. 14 is a first perspective view of an impeller air gauge in a ventilation valve according to an embodiment of the present invention;

fig. 15 is a second perspective view of an impeller air gauge in the ventilation valve according to the embodiment of the present invention;

figure 16 shows a third perspective view of an impeller air gauge in a ventilation valve according to an embodiment of the present invention;

fig. 17 shows a fourth perspective view of an impeller air gauge in a vent valve according to an embodiment of the present invention;

fig. 18 shows a first top view of an impeller air gauge in a ventilation valve according to an embodiment of the present invention;

figure 19 shows a side view of an impeller air gauge in a ventilation valve according to an embodiment of the present invention;

fig. 20 is an exploded perspective view of an impeller air gauge in a ventilation valve according to an embodiment of the present invention;

fig. 21 is a second plan view of the impeller type air gauge in the ventilation valve according to the embodiment of the present invention;

fig. 22 is a sectional view of a portion a-a in fig. 21.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

With reference to fig. 1 to 8, the present application provides a vent valve 1 comprising: valve body 10, a plurality of air valve blades 20, transmission mechanism 30 and drive device 40.

Wherein the valve body 10 has an inner cavity 11 extending in a first direction (shown as Z direction in fig. 1), both ends of the valve body 10 have openings (openings of one end of the valve body 10 are shown in fig. 1) communicating with the inner cavity 11 in the first direction, and the inner cavity 11 has a center line (shown as O in fig. 1) extending in the first direction. Illustratively, the valve body 10 is cylindrical. The plurality of air valve blades 20 are arranged along the circumferential direction (shown by T in figure 1) around the central line and are positioned in the inner cavity 11, each air valve blade 20 is provided with a rotating shaft 21, and the rotating shaft 21 of each air valve blade 20 is perpendicular to the central line. Illustratively, the damper blade 20 is fan-shaped.

In the present application, the transmission mechanism 30 is disposed outside the inner cavity 11 of the valve body 10, and each of the air valve blades 20 is connected to the transmission mechanism 30. The driving device 40 is disposed outside the inner cavity 11 of the valve body 10 and connected to the transmission mechanism 30, and the driving device 40 is configured to drive the transmission mechanism 30, so that the transmission mechanism 30 drives each of the air valve blades 20 to rotate synchronously around the respective rotating shaft 21 (the direction P in fig. 3 is a rotating direction), so as to switch the ventilation valve 1 between the closed state and the open state.

Illustratively, the driving device 40 is a motor (e.g., a stepper motor) mounted on the outer surface of the valve body 10 via a mounting portion 41 (e.g., a mounting plate). Referring to fig. 1 to 4, when the valve body 10 is in a closed state (the opening of the vent valve 1 is 0 °), the side ends 22 of the adjacent damper blades 20 are attached to each other, and have a certain sealing performance. The lateral ends 22 of the damper blades 20 extend in a radial direction (shown as M in fig. 1 to 4), which is perpendicular to the first direction.

Referring to fig. 5 to 8, the valve body 10 is in an open state, and the side ends 22 of the adjacent damper blades 20 are separated. Illustratively, the transmission mechanism 30 drives each of the damper blades 20 to synchronously rotate in the forward direction around the respective rotating shaft 21, and the vent valve 1 is switched from the closed state to the open state. The transmission mechanism 30 drives each air valve blade 20 to synchronously rotate reversely around the respective rotating shaft 21, and the ventilation valve 1 is switched from the open state to the closed state.

The opening degree of the vent valve 1 in the open state can be controlled by the angle of each of the damper blades 20 rotated about the respective rotation shaft 21 by the driving device 40. Fig. 5 and 6 show that the opening degree of the vent valve 1 is 45 °, and the angle between each of the damper blades 20 and the horizontal direction may be 45 °. Fig. 7 and 8 show that the opening degree of the ventilation valve 1 is 90 °, and the angle of each of the damper blades 20 from the horizontal direction may be 90 °. The opening size of the vent valve 1 in the open state is not limited, and the vent valve 1 is correspondingly controlled according to actual ventilation requirements, for example, the opening of the vent valve 1 is 30 degrees, 60 degrees, 75 degrees and the like.

In this application, move the drive mechanism of valve body 10 outward (outside the inner chamber 11 of locating valve body 10), drive mechanism 30 does not set up the center department at the inner chamber 11 of valve body 10, and drive mechanism 30 no longer occupies the space of the central point department of putting of valve body 10 of vent valve 1, can effectively increase vent valve 1's flow area. Particularly, in the case of the small-bore vent valve 1, the flow area of the vent valve 1 can be further increased while reducing the space occupied by the transmission mechanism 30 at the center position of the valve body 10.

Illustratively, a support part is arranged at the center of the inner cavity 11 of the valve body 10, a central line passes through the support part, one end of the rotating shaft 21 of each air flap blade 20 is rotatably supported on the support part, and the other end is fixedly connected with the transmission mechanism 30. In some possible embodiments, referring to fig. 2 and 3, the support portion includes an upper bowl cover 12 and a lower bowl cover 13 which are butted in a first direction, the upper bowl cover 12 and the lower bowl cover 13 are butted to form a plurality of rotating shaft support holes 131 which are distributed at intervals in the circumferential direction, and one end of the rotating shaft 21 is supported in the rotating shaft support holes 131. Wherein, the upper bowl cover 12 and the lower bowl cover 13 are respectively provided with a cavity, and the outer edge is provided with a plurality of half rotating shaft supporting holes 131 which are distributed at intervals along the circumferential direction, when the upper bowl cover 12 and the lower bowl cover 13 are butted along the first direction, the upper bowl cover 12 and the lower bowl cover 13 form a complete rotating shaft supporting hole 131, so that one end of the rotating shaft 21 can be supported in the rotating shaft supporting hole 131.

That is, the space at the center position of the valve body 10 of the present application is occupied by the support portion. After the above-described transmission mechanism 30 is moved outward, the space occupied by the support portion at the center position, for example, the space at the center position of the valve body 10 can be reduced to Φ 29mm to Φ 32 mm.

The number of the damper blades 20 is not limited by the present application, 9 damper blades 20 are shown in fig. 1 to 8, and a corresponding number of damper blades 20 may be used according to the use requirement in other embodiments. Exemplarily, the central portion of the air valve blade 20 is provided with the rotating shaft 21. In the present application, the air valve blade 20 and the rotating shaft 21 are of an integrated structure. Namely, in the production process, the air valve blade 20 and the rotating shaft 21 are integrally formed, so that the strength of the air valve blade 20 is effectively improved. Illustratively, the thickness of the damper blade 20 is 3mm to 5 mm. The above-mentioned air valve blade 20 is made of non-metal material, such as polyethylene material (PE), polyvinyl chloride material (PVC), polypropylene material (PP), etc. for example, but the present application is not limited thereto, and other materials may be used as the material of the air valve blade 20.

In some possible embodiments, the transmission mechanism 30 drives each of the damper blades 20 to rotate synchronously in the forward direction or in the reverse direction by the same angle around the respective rotation shaft 21, so as to switch the vent valve 1 between the closed state and the open state. This is provided to facilitate the control of the synchronous rotation of all the damper blades 20 after the plurality of damper blades 20 are arranged in the valve body 10 to switch the vent valve 1 between the closed state and the open state.

With continued reference to fig. 1-8, the transmission 30 of the present application includes: a primary transmission part, which is annular (for example, a transmission ring 31 and a gear disc 31a described later), is sleeved on the outer surface of the valve body 10, and is connected with the driving device 40; a plurality of secondary transmission parts (a blade lever 31 and a link 34, a rocker 35, and a blade gear 36, which will be described later) corresponding to the plurality of damper blades 20 one by one, each secondary transmission part being connected to the rotating shaft 21 of the corresponding damper blade 20 and to the primary transmission part.

Thus, the driving device 40 drives the primary transmission portion to rotate in a circumferential direction in a forward direction (indicated by a direction in fig. 2) or a reverse direction (indicated by B direction in fig. 2) to synchronously drive each secondary transmission portion, and then each secondary transmission portion drives the corresponding damper blade 20 to rotate around the respective rotating shaft 21 in the forward direction or the reverse direction. During the process that the primary transmission part rotates along the circumferential direction (the direction A in figure 2), the ventilation valve 1 is switched from the closed state to the open state; during the reverse rotation of the primary transmission portion in the circumferential direction (indicated by the direction B in fig. 2), the vent valve 1 is switched from the open state to the closed state.

The driving device 40 is exemplified as a motor. The output shaft 42 of the motor is connected with the first-stage transmission part, the output shaft 42 of the motor transmits the moment to the first-stage transmission part, and the output shaft 42 of the motor and the first-stage transmission part are always synchronous; the first-stage transmission part transmits the torque to the second-stage transmission part in a unified mode, and then the torque is transmitted to each air valve blade 20 through the second-stage transmission part, so that each air valve blade 20 is synchronous all the time when rotating, and the closing of the air valve blades 20 is guaranteed. The external transmission structure solves the problem that the multiple air valve blades 20 rotate asynchronously, can reduce air leakage and solve the problem of squeal.

In some possible embodiments, referring to fig. 1 to 8, the primary transmission part is a transmission ring 31, and the transmission ring 31 is a steel transmission ring 31. The second-stage transmission part is a blade shift lever 32, one end of the blade shift lever 32 is rotatably connected with the transmission ring 31, and the other end of the blade shift lever is fixedly connected with the rotating shaft 21 of the air valve blade 20. Illustratively, in the first direction, the primary transmission portion may be located above the secondary transmission portion (shown in fig. 2); alternatively, the primary drive portion may be located below the secondary drive portion (shown in FIG. 1).

The motor drives the transmission ring 31 to rotate forwards along the circumferential direction, the transmission ring 31 transmits torque to each blade shift lever 32, each blade shift lever 32 can swing with the connection point of the rotating shaft 21 and the blade shift lever 32 as a fulcrum (the intersection point N of a dotted line C and a dotted line D in fig. 2), and swing from the position shown by C in fig. 2 to the position shown by D in fig. 2 to 8, so that each blade shift lever 32 can drive the rotating shaft 21 of the corresponding air valve blade 20 to rotate forwards when swinging, each air valve blade 20 can rotate forwards around the respective rotating shaft 21, and the ventilation valve 1 is switched from a closed state to an open state.

Or, the motor drives the transmission ring 31 to rotate reversely in the circumferential direction, the transmission ring 31 transmits torque to each blade shift lever 32, so that the other end of each blade shift lever 32 swings around the connection point of the rotating shaft 21 and the blade shift lever 32 as a fulcrum, and swings from the position shown in D in fig. 2 to 8 to the position shown in C in fig. 2, thereby each blade shift lever 32 drives the rotating shaft 21 of the corresponding air valve blade 20 to rotate reversely when swinging, each air valve blade 20 rotates reversely around the respective rotating shaft 21, and the ventilation valve 1 is switched from the open state to the closed state.

In the process of swinging the blade deflector 32, the driving ring 31, the blade deflector 32 and the motor are always synchronous, so that all the air valve blades 20 are ensured to synchronously rotate in the forward direction or the reverse direction.

The rotational connection between the blade shift lever 32 and the driving ring 31 is not limited, in some possible embodiments, the outer peripheral surface of the driving ring 31 is provided with a plurality of first protrusions 311 corresponding to the plurality of blade shift levers 32 one to one, one end of the blade shift lever 32 is provided with a first through hole 321 extending along the extending direction of the blade shift lever 32, and the first protrusion 311 corresponding to the blade shift lever 32 is clamped in the first through hole 321 and can move along the hole wall of the first through hole 321. When motor drive driving ring 31 is along circumference forward or reverse rotation, because first lug 311 and first through-hole 321 joint on the driving ring 31 to, driving ring 31 can transmit moment synchronization for each blade driving lever 32, and driving ring 31 continues circumferential direction's in-process, first lug 311 can remove along the pore wall of first through-hole 321, in order to drive each blade driving lever 32 synchronous oscillation, drives each blast gate blade 20 synchronous forward or reverse rotation then. This improves the synchronicity of the transmission.

Exemplarily, fig. 2 shows the vent valve 1 in the closed state, and the first protrusion 311 on the driving ring 31 is located at the upper left corner of the first through hole 321. Fig. 6 shows the vent valve 1 in a 45 ° open state, with the first projection 311 on the driving ring 31 at the bottom position of the first through hole 321. Fig. 8 shows the vent valve 1 in a 90 ° opening state, the first protrusion 311 on the driving ring 31 is located at the upper left corner of the first through hole 321, fig. 8 shows the vane shift lever 32 swinging to the right to the extreme position, and fig. 2 shows the air valve vane 20 swinging to the left to the extreme position.

The application does not limit the connection mode of the driving device 40 and the transmission ring 31, and the mode of driving the transmission ring 31 to rotate forward or reversely belongs to the protection scope of the application. Exemplarily, referring to fig. 2 and 5, the transmission mechanism 30 of the present application further includes: the actuator 33, for example, the actuator 33 has the same structure as the blade lever 32. The driving lever 33 of the present application has one end rotatably connected to the driving ring 31 and the other end fixedly connected to the driving device 40. The driving device 40 is used for driving the driving lever 33 to swing forwards or backwards so as to drive the transmission ring 31 to rotate forwards or backwards along the circumferential direction. For example, the output shaft 42 of the motor rotates forward or backward, and the output shaft 42 of the motor drives the driver 33 to swing forward or backward, thereby driving the driving ring 31 to rotate forward or backward in the circumferential direction during the swing of the driver 33.

Because the output shaft 42 of the motor is fixedly connected with the driving shift lever 33, the driving shift lever 33 is always synchronous with the output shaft 42 of the motor, so that the transmission ring 31, the blade shift lever 32, the driving shift lever 33 and the output shaft 42 of the motor are always synchronous in the process that the driving shift lever 33 swings forwards or backwards, and all the air valve blades 20 are ensured to synchronously rotate forwards or backwards.

The rotation connection between the driving lever 33 and the driving ring 31 is not limited, in some possible embodiments, a second protrusion 312 corresponding to the driving lever 33 is disposed on the outer circumferential surface of the driving ring 31, a second through hole 331 extending along the extending direction of the driving lever 33 is disposed at one end of the driving lever 33, and the second protrusion 312 is engaged in the second through hole 331 and can move along the hole wall of the second through hole 331. When the output shaft 42 of the motor drives the driving lever 33 to swing forward or backward, because the second protruding block 312 on the driving ring 31 is connected with the second through hole 331 in a clamping manner, the driving lever 33 can transmit the torque to the driving ring 31 synchronously, the driving lever 33 continues to swing forward or backward, the second protruding block 312 can move along the hole wall of the second through hole 331 to drive the driving ring 31 to rotate forward or backward synchronously along the circumferential direction, and then each air valve blade 20 is driven to rotate forward or backward synchronously. This improves the synchronicity of the transmission.

It should be noted that the primary transmission portion and the secondary transmission portion are not limited to the structures described in the above embodiments. In some possible embodiments, referring to fig. 9 and 10, the primary transmission part is a transmission ring 31, the secondary transmission part includes a connecting rod 34 and a rocker 35, one end of the connecting rod 34 is rotatably connected with the transmission ring 31, the other end of the connecting rod is rotatably connected with one end of the rocker 35, and the other end of the rocker 35 is fixedly connected with the rotating shaft 21 of the air valve blade 20.

The difference from the above-described embodiment is that the structure of the two-stage transmission portion is different. Correspondingly, in the process that the motor drives the transmission ring 31 to rotate forwards or reversely along the circumferential direction, the transmission ring 31 transmits the torque to each connecting rod 34, each connecting rod 34 transmits the torque to the corresponding rocker 35, the rocker 35 can swing forwards or reversely by taking the connecting point of the rotating shaft 21 and the rocker 35 as a fulcrum, so that each rocker 35 can drive the rotating shaft 21 of the corresponding air valve blade 20 to rotate forwards or reversely when swinging, each air valve blade 20 can rotate forwards or reversely around the rotating shaft 21, and the ventilation valve 1 is switched from the closed state to the open state.

In this embodiment, the connection between the driving device 40 and the driving ring 31 is not limited, and the connection shown in fig. 1 to 8 may be adopted, that is, the motor is connected to the driving ring 31 through the driving lever 33. In some possible embodiments, the driving motor may be connected to the driving ring 31 by means of the above-mentioned rocker 35 and link 34. For example, one end of the link 34 is rotatably connected to the driving ring 31, the other end is rotatably connected to one end of the rocker 35, and the other end of the rocker 35 is fixedly connected to the output shaft 42 of the motor.

In some possible embodiments, referring to fig. 11 and 12, the primary transmission part is a gear disc 31a, and one end of the gear disc 31a in the first direction is provided with teeth 311 distributed along the circumferential direction; the secondary transmission part is a blade gear 36, and the blade gear 36 is fixedly connected with the rotating shaft 21 of the air valve blade 20 and meshed with the teeth 311 of the gear disc 31 a. In the present application, the blade gear 36 is located below the gear plate 31a, and the lower end of the gear plate 31a in the first direction is provided with teeth 311 distributed in the circumferential direction. In some possible embodiments, the blade gear 36 is located above the gear disc 31a, and the upper end of the gear disc 31a in the first direction is provided with teeth 311 distributed along the circumferential direction.

The difference from the above embodiment is that the primary transmission portion and the secondary transmission portion are different in structure. Correspondingly, during the forward or reverse rotation of the motor-driven gear disc 31a along the circumferential direction, the gear disc 31a is meshed with each blade gear 36, so that the torque is transmitted to each blade gear 36, each blade gear 36 can rotate forward or reverse, and therefore, when each blade gear 36 rotates forward or reverse, the rotating shaft 21 of the corresponding air valve blade 20 can be driven to rotate forward or reverse, and then each air valve blade 20 can rotate forward or reverse around the corresponding rotating shaft 21, and the ventilation valve 1 is switched from the closed state to the open state.

With continued reference to fig. 11 and 12, the transmission mechanism 30 further includes: and the driving gear 37, the driving gear 37 and the driving device 40 are fixedly connected and meshed with the teeth 311 of the gear disc 31a, and the driving device 40 is used for driving the driving gear 37 to rotate forwards or backwards so as to drive the gear disc 31a to rotate forwards or backwards along the circumferential direction. For example, the output shaft 42 of the motor is connected to the drive gear 37, and the drive gear 37 and the plurality of blade gears 36 are located in the same circumferential direction. Thus, when the output shaft 42 of the motor rotates forward or backward, the driving gear 37 is driven to rotate forward or backward, and then the driving gear plate 31a rotates forward or backward in the circumferential direction. In this form, the teeth 311 on the gear disc 31a are fully utilized, and the gear disc 31a is driven by the motor in the circumferential direction through the transmission structure of the teeth 311, so that the structure of the vent valve 1 is compact.

It should be noted that the above-mentioned first-stage transmission part and second-stage transmission part are examples, and the way in which the transmission mechanism 30 moves outwards and can drive the air valve blade 20 to rotate belongs to the protection scope of the present application.

With continued reference to fig. 2-4, the vent valve 1 is in a closed state, with each damper blade 20 including a front face 23 and a back face 24 in a first orientation. Illustratively, when the vent valve 1 is in the closed state, the front surface 23 and the back surface 24 of each damper blade 20 are perpendicular to the center line O of the valve body 10. When the vent valve 1 is opened at 45 degrees (in the state shown in fig. 5 and 6), the front surface 23 and the back surface 24 of each of the damper blades 20 form an angle of 45 degrees with the horizontal direction. When the vent valve 1 is opened by 90 ° (the state shown in fig. 7 and 8), the front surface 23 and the back surface 24 of each of the damper blades 20 are at an angle of 90 ° to the horizontal direction.

As described above, the damper blade 20 of the present application has a fan shape, and the fan-shaped damper blade 20 includes an arc-shaped section and a radial section (the side end 22 of the damper blade 20 described in the foregoing embodiment) connected to both ends of the arc-shaped section and extending in the radial direction. That is, the fan-shaped air valve blade 20 includes side ends 22 located at both sides of the arc-shaped segment, the front surface 23 of one side end 22 of the air valve blade 20 of the present application is provided with a first V-shaped structure 231, and the back surface 24 of the other side end 22 of the air valve blade 20 is provided with a second V-shaped structure 241.

When the vent valve 1 is in the closed state, the first V-shaped structure 231 and the second V-shaped structure 241 of the adjacent damper blades 20 are attached to each other, the outer edge of the first V-shaped structure 231 is located in the second V-shaped structure 241, and the outer edge of the second V-shaped structure 241 is located in the first V-shaped structure 231. Equivalently, the side ends 22 of adjacent damper blades 20 overlap to effect a seal. The air valve blades 20 are in a 'handle' structure, and the sealing performance is good when the ventilation valve 1 is closed.

In some possible embodiments, the first V-shaped structure 231 of the damper blade 20 of the present application includes a first surface 2311 and a second surface 2312 that are connected, the first surface 2311 of the first V-shaped structure 231 being closer to an outer edge 2313 of the first V-shaped structure 231 than the second surface 2312; the second V-shaped structure 241 includes a first surface 2411 and a second surface 2412 connected together, and the first surface 2411 of the second V-shaped structure 241 is closer to an outer edge 2413 of the second V-shaped structure 241 than the second surface 2412. When the vent valve 1 is in the closed state, the first surface 2311 of the first V-shaped structure 231 of the adjacent damper blade 20 and the first surface 2411 of the second V-shaped structure 241 are attached to each other. That is, the first surface 2311 of the first V-shaped structure 231 of the damper blade 20 and the first surface 2411 of the second V-shaped structure 241 are overlapped together.

In some possible embodiments, the outer edge 2313 of the first V-shaped structure 231 is of a rounded design and the outer edge 2413 of the second V-shaped structure 241 is of a rounded design. The edges of the damper blades 20 are rounded to eliminate squeal. Illustratively, the noise when the vent valve is closed (0.5 m from the vent valve) was tested using a noise meter, and the noise was reduced by 5db and the high frequency squeal was completely eliminated when the vent valve 1 was fully closed and the pre-valve pressure was 1200 Pa. The air leakage rate is reduced to 30cmh from the original 90 cmh.

In some possible embodiments, the opening of the first V-shaped structure 231 is disposed upward and the opening of the second V-shaped structure 241 is disposed downward along the first direction. Thus arranged, the damper blades 20 of the ventilation valve 1 are rotated in opposite directions about the respective rotation shafts 21 to be overlapped with each other. That is, it is advantageous to maintain the sealing property when the ventilation valve 1 is switched from the open state to the closed state.

Illustratively, the first surface 2311 and the second surface 2312 of the first V-shaped structure 231 of the present application are disposed at an obtuse angle, such as 135 °. The first surface 2411 and the second surface 2412 of the second V-shaped structure 241 of the present application are disposed at an obtuse angle, such as 135 °. This is advantageous for eliminating squeal after the adjacent damper blades 20 are overlapped, and reducing the amount of air leakage.

Referring to fig. 9 to 13, a plurality of vane air gauges 50 are further disposed in the inner cavity 11 of the valve body 10 of the ventilation valve 1 of the present application, so that the amount of air introduced into the ventilation valve 1 can be better measured. Illustratively, the distances from the axes of the impeller air gauges 50 to the center line O of the valve body 10 are unequal, so as to measure the air volume of the ventilation valve 1 with different rotation radiuses. In the present application, fig. 13 shows that three vane air gauges 50 monitor the ventilation volume of the ventilation valve 1, and the distances from the axes of the three vane air gauges 50 to the center line O of the valve body 10 are different. The number of the impeller type air flow meters 50 is not limited in the present application, and a corresponding number of impeller type air flow meters 50 (for example, 4, 5, 6, etc.) may be provided in the valve body 10 according to the use requirement, so as to better monitor the air flow of the three portions of the outer side, the inner side, and the middle of the vent valve 1.

Referring to fig. 13 to 15, a plurality of vane type wind instruments 50 are fixed in the valve body 10 of the ventilation valve 1 by a fixing bracket 60. The fixing bracket 60 includes three sections that meet at a point, and one vane-type air gauge 50 is provided on each section of the fixing bracket 60. Illustratively, the fixing bracket 60 is fixed to the upper bowl cover 12 at a central position of the valve body 10 by a fixing rod. Illustratively, the fixing bracket 60 is provided with a threaded hole, the upper bowl cover 12 is provided with a threaded hole, the fixing rod is a screw rod extending along a first direction, and two ends of the screw rod are respectively in threaded connection with the fixing bracket 60 and the upper bowl cover 12.

Referring to fig. 14 to 18, each vane-type wind instrument 50 includes: a rotating portion 503 capable of rotating in a circumferential direction (indicated by a direction T in fig. 14); a plurality of impeller blades 504 provided on the outer peripheral surface of the rotating portion 503 at intervals in the circumferential direction, each impeller blade 504 including a first portion 5041 and a second portion 5042, the first portion 5041 being connected to the rotating portion 503. In the second direction, the width of the first portion 5041 gradually increases, the width of the second portion 5042 is equal, the maximum width of the first portion 5041 is equal to the width of the second portion 5042, the second direction is a direction from the first portion 5041 to the second portion 5042, and the second direction is a radial direction perpendicular to the rotating portion 503.

The shape of the impeller blade 504 formed by the first part 5041 and the second part 5042 is similar to a shovel shape, the shovel-shaped impeller blade 504 can increase the frontal area, so that the thrust of wind load on the impeller blade 504 is increased, the moment M exerted by the wind load on the axis of the impeller type wind meter 50 is increased, the initial wind speed is reduced, and the impeller blade 504 can be pushed to rotate by small wind quantity. Where M is L × F, L is the length of the impeller blade 504 (L1+ L2 described later), and F is the force applied by the wind to the impeller blade 504.

In some possible embodiments, referring to FIG. 18, the first portion 5041 of the impeller blade 504 has a length L1 and the second portion 5042 has a length L2, wherein 0.45 ≦ L2/(L1+ L2) ≦ 0.6. Thus configured, the impeller blades 504 have sufficient length to create a frontal area such that wind loads can propel the impeller blades 504 to rotate against friction. Illustratively, the overall length L of the impeller blades 504 ranges between 10mm and 25mm in length.

Illustratively, the area of the first portion 5041 of the impeller blades 504 is S1 and the area of the second portion 5042 of the impeller blades 504 is S2, wherein 1.2 ≦ S2/S1 ≦ 1.5. Illustratively, the area of the frontal area (S1+ S2) of the impeller blades 504 ranges from 100mm²To 250mm². This may increase the frontal area and thus increase the thrust of the wind load on the damper blades 20.

With continued reference to fig. 18, the diameter of the rotating part 503 of the vane-type wind instrument 50 of the present application is D1, and the outer diameter of the overall structure formed by the rotating part 503 and the plurality of vane blades 504 (the outer diameter of O1 shown in fig. 18) is D2, 2 ≦ D2/D1 ≦ 4. Illustratively, the diameter of the impeller type air flow meter 50 is reduced from original phi 73mm to phi 50mm, so that the impeller type air flow meter 50 occupies a small flow area, and the small-diameter ventilation valve 1 is possible. Since the impeller type air flow meter 50 is made smaller, the weight is reduced, the moment generated by the friction force at the axis of the impeller type air flow meter 50 is reduced, and the impeller blade 504 can be pushed with a small air volume.

Referring to FIG. 19, each impeller blade 504 of the present application is angled from the horizontal (the angle between dashed line F and dashed line E in FIG. 19) by α, 30 ≦ α ≦ 45. Within this angle range, the impeller blades 504 can be pushed with a small amount of wind. Illustratively, the optimized impeller blade 504 configuration uses a starting wind speed that is reduced from 0.8m/s to 0.5 m/s.

With continued reference to fig. 15-17 in conjunction with fig. 20-22, the vane-type wind instrument 50 further includes: the housing 501 is provided with a first shaft seat 507 and a second shaft seat 506 spaced apart from each other in a first direction (shown as Z direction in fig. 22). The housing 501 is provided with a first mounting seat 509 and a second mounting seat 502 along a first direction. The first mounting seat 509 is located below the housing 501 and mounted on the fixing bracket 60 (see fig. 15) in the foregoing embodiment, the first mounting seat 509 has a first mounting hole 5091, and the first shaft seat 507 is mounted in the first mounting hole 5091. The second mounting seat 502 is located above the housing 501 and connected to the inner wall of the housing 501, the second mounting seat 502 includes three sections meeting at one point, a second mounting hole 5021 is formed in the meeting point of the three sections of the second mounting seat 502, and the second shaft seat 506 is mounted in the second mounting hole 5021.

In addition, the vane-wheel type wind instrument 50 further includes a tip shaft 508 extending along the first direction, the tip shaft 508 is located in the housing 501, the shaft hole 5031 of the rotating portion 503 is sleeved on the tip shaft 508, and two tips of the tip shaft 508 are respectively installed on the first shaft seat 507 and the second shaft seat 506. Illustratively, the rotating portion 503 is fixedly connected to the tip shaft 508, and the rotating portion 503 rotates coaxially with the tip shaft 508. The impeller-type air flow meter 50 of the present application does not employ a bearing structure, but rather employs a wear-resistant tip shaft 508 and a wear-resistant shaft seat structure. The vent valve 1 can be used in digestion experiments (strong acid high temperature heating) without the problem that the bearing is corroded. In addition, the sharp shaft 508 structure can reduce the initial wind speed, and the impeller blades 504 can be pushed to rotate by small wind quantity.

Illustratively, referring to fig. 20, the two ends 5092 of the first mounting socket 509 of the present application extend in a first direction (shown in the Z direction in fig. 20) and are inserted into the housing 501 to snap-fit with the housing 501. Illustratively, the outer peripheral surface of the housing 501 is provided with a plug hole 5011, and both ends 5092 of the first mounting seat 509 are inserted into the plug hole 5011 of the housing 501 along the first direction and are clamped with the plug hole 5011 of the housing 501. The connection stability of the first mount 509 and the housing 501 is improved.

Illustratively, the anemometer vane anemometer 50 of the present application employs an acid mist resistant material. Illustratively, the tip shaft 508 is made of a ceramic, such as zirconia or silicon carbide. The material of the shaft seat is polytetrafluoroethylene (abbreviated as PTFE) or artificial gem stone. The impeller blades 504 and the rotor 503 are made of PP (polypropylene), PPs (phenylene sulfide), or the like.

With continued reference to fig. 20 and 22, in the first orientation, the second shaft mount 506 above the pointed shaft 508 is an adjustment screw that is threadedly coupled to the housing 501, i.e., the second mounting hole 5021, to adjust the distance between the adjustment screw and the first shaft mount 507. The adjusting screw structure at the top of the pointed shaft 508 can be used for calibrating the machining error of each pointed shaft 508 in the first direction, and adjusting the rotation resistance of the pointed shaft 508, so that the rotating speeds of all the impeller blades 504 are the same when the air volume is the same, and the air volume measurement and the measurement accuracy of the vent valve 1 are improved.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.