1. An electrically operated valve, including stator module, valve part, valve body and sleeve pipe, stator module is located the periphery of sleeve pipe, stator module with the valve body spacing or fixed connection, its characterized in that: the electric valve also comprises a first sealing ring, the stator assembly is provided with a concave part, at least part of the concave part is opened towards the valve body, the first sealing ring is positioned in the concave part, the concave part is positioned on the periphery of the sleeve, and the first sealing ring is positioned between the valve body and the stator assembly; the concave part is provided with a first mounting surface and a second mounting surface, the inner side of part of the first sealing ring is abutted with the periphery of the sleeve in the radial direction, and the outer side of the first sealing ring is abutted with the second mounting surface; in the axial direction, the first sealing ring is limited by the first mounting surface.

2. An electrically operated valve as claimed in claim 1, wherein: an included angle is formed between the second mounting surface and the side wall of the sleeve, the included angle is larger than 0 degree and smaller than 90 degrees, and the second mounting surface is opposite to the outer peripheral surface of the sleeve.

3. An electrically operated valve as claimed in claim 1 or 2, wherein: the electric valve further comprises a compression nut and a supporting pad, the valve body is in limit connection with the valve component through the compression nut, the sleeve is in limit connection with the valve component, the supporting pad is located at the upper end of the compression nut, the supporting pad is in limit connection with the compression nut or the supporting pad and the compression nut are integrated, a part of an opening of the concave portion faces the supporting pad, and the lower end face of the first sealing ring is abutted to the supporting pad.

4. An electrically operated valve as claimed in claim 3, wherein: the supporting pad is in limit connection with the compression nut, the outer peripheral wall of the compression nut is provided with an external thread, the valve body is provided with an internal thread, and the compression nut is in threaded connection with the valve body; the compression nut is further provided with at least two pits, the supporting pad is provided with at least two protrusions, and the pits are matched with the protrusions to enable the supporting pad to be limited.

5. An electrically operated valve as claimed in claim 3, wherein: the supporting pad and the compression nut are integrated, the outer peripheral wall of the integrated piece is provided with an external thread, the valve body is provided with an internal thread, and the integrated piece is in threaded connection with the valve body; the integrated piece is also provided with at least two concave pits, and the lower end face of the first sealing ring is abutted to the integrated piece.

6. An electrically operated valve as claimed in any one of claims 1 to 5 wherein: stator module still includes stator housing, winding, skeleton, the portion of moulding plastics, the winding is located stator housing's inside, the skeleton does the winding provides the support, the portion of moulding plastics with winding, skeleton, stator housing are for the integrative formation of moulding plastics of inserts of moulding plastics, the concave part is located the portion of moulding plastics.

7. An electrically operated valve as claimed in any one of claims 1 to 6 wherein: the injection molding part is provided with a first cavity and a second cavity, the electric valve is also provided with a circuit board, the circuit board is positioned in the first cavity, and the circuit board is electrically connected/signal-connected with the winding; at least part of the second cavity is located in the middle of the stator assembly and at least part of the sleeve is located in the second cavity.

8. A method of assembling an electrically operated valve comprising the steps of:

assembling the valve component and the sleeve to form a valve component and sleeve assembly;

assembling the valve component and the sleeve assembly with the valve body, and connecting the valve component, the sleeve assembly and the valve body in a limiting manner by screwing a compression nut to form a valve seat assembly;

limiting the supporting pad and the compression nut;

assembling a first sealing ring, namely sleeving the first sealing ring from the upper end of the sleeve and abutting against the supporting pad;

with stator module and valve body spacing connection, including with clamp plate and stator module fixed connection, align stator module's second chamber and sleeve pipe, align concave part and first sealing washer position to exert to stator module and push in down the power until with the valve body butt and first sealing washer is located the concave part, the rethread screw is with clamp plate and valve body spacing connection.

9. The assembly method of claim 8, wherein:

and forming a concave part on the stator assembly, wherein the concave part is provided with a first mounting surface and a second mounting surface, the first mounting surface is opposite to the valve body, the second mounting surface is opposite to the sleeve, the first sealing ring is abutted against the second mounting surface, and the included angle between the second mounting surface and the sleeve is more than 5 degrees and less than or equal to 18 degrees.

Background

The electric valve is used in an air-conditioning refrigeration system, and comprises a stator assembly, a rotor assembly and a sleeve, wherein the sleeve is positioned between the rotor assembly and the stator assembly, and how to reduce the external moisture entering the stator assembly through the gap between the sleeve and the stator assembly is a technical problem.

Disclosure of Invention

The invention provides an electric valve which is beneficial to reducing the phenomenon that external moisture enters a stator assembly through a gap between a sleeve and the stator assembly; the invention also provides an assembling method of the electric valve.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electrically operated valve, including stator module, valve part, valve body and sleeve pipe, stator module is located the periphery of sleeve pipe, stator module with the valve body spacing or fixed connection, its characterized in that: the electric valve also comprises a first sealing ring, the stator assembly is provided with a concave part, at least part of the concave part is opened towards the valve body, the first sealing ring is positioned in the concave part, the concave part is positioned on the periphery of the sleeve, and the first sealing ring is positioned between the valve body and the stator assembly; the concave part is provided with a first mounting surface and a second mounting surface, the inner side of part of the first sealing ring is abutted with the periphery of the sleeve in the radial direction, and the outer side of the first sealing ring is abutted with the second mounting surface; in the axial direction, the first sealing ring is limited by the first mounting surface.

An assembling method of an electric valve, wherein a valve part and a sleeve are assembled to form a valve part and sleeve assembly; assembling the valve component and the sleeve assembly with the valve body, and connecting the valve component, the sleeve assembly and the valve body in a limiting manner by screwing a compression nut to form a valve seat assembly; limiting the supporting pad and the compression nut; assembling a first sealing ring, namely sleeving the first sealing ring from the upper end of the sleeve and abutting against the supporting pad; with stator module and valve body spacing connection, including with clamp plate and stator module fixed connection, align stator module's second chamber and sleeve pipe, align concave part and first sealing washer position to exert to stator module and push in down the power until with the valve body butt and first sealing washer is located the concave part, the rethread screw is with clamp plate and valve body spacing connection.

This technical scheme's motorised valve is through setting up first sealing washer between stator module and valve part to carry on spacingly by recess and sleeve pipe that form in stator module and corresponding valve body to first sealing washer, be favorable to reducing the moisture among the external environment to a certain extent and pass through stator module and sheathed tube clearance entering stator module.

The assembling method of the electric valve in the technical scheme is beneficial to assembling the first sealing ring, and the assembling process is simpler.

Drawings

Figure 1 is a cross-sectional view of one embodiment of an electrically operated valve;

FIG. 2 is an enlarged partial cross-sectional schematic view of FIG. 1;

FIG. 3 is a cross-sectional view of a stator assembly;

FIG. 4 is an enlarged partial schematic view at I of FIG. 3;

FIG. 5 is a schematic perspective view of the support pad;

FIG. 6 is a perspective view of the compression nut;

fig. 7 is a perspective view of another embodiment of a compression nut and support pad.

Detailed Description

The invention will be further described with reference to the following figures and specific examples:

fig. 1 shows an embodiment of an electric valve 100, and the electric valve 100 can be applied to an air conditioning system for flow rate adjustment and on-off control of the system, and is particularly suitable for an automotive air conditioning system. The electric valve 100 includes a stator assembly 1, a circuit board 2, a valve member 3, a valve body 4, a rotor assembly 31, and a sleeve 9. The stator assembly 1 is positioned at the periphery of the rotor assembly 31, and the stator assembly 1 and the rotor assembly 31 can directly or indirectly drive the valve component 3 to move; the stator assembly 1 is located at the outer periphery of the sleeve 9, and the sleeve 9 is located between the stator assembly 1 and the rotor assembly 31. The stator assembly 1 is limited or fixedly connected with the valve body 4, and the stator assembly 1 is electrically connected/signal-connected with the circuit board 2. The stator assembly 1 comprises windings 12, the windings 12 being located inside the stator assembly 1. The valve member 3 includes a valve element 32, a valve seat 33, and the electric valve further includes a valve port 331, the valve port 331 is located on the valve seat 33 in the present embodiment, and as another embodiment, the valve port may be directly provided on the valve body, and the valve seat is omitted. When the electric valve 100 works, the current passing through the winding 12 of the stator assembly 1 is controlled to change according to a predetermined rule, so that the stator assembly 1 is controlled to generate a changing excitation magnetic field, the rotor assembly 31 rotates under the action of the excitation magnetic field, the rotor assembly 31 can directly or indirectly drive the valve core 32 to move relative to the valve port 331, the opening degree of the valve port 331 is adjusted, and the flow rate adjustment and on-off control of a system are realized. It is explained here that if the stator assembly 1 is located at the outer periphery of the casing 9, the designated sub-assembly is located outside the casing wall, rather than on the casing wall. Other references to the periphery herein should be understood the same.

Stator module 1 still includes stator housing 11, skeleton 13, the portion 14 of moulding plastics, winding 12 is located the inside of stator housing 11, skeleton 13 provides the support for winding 12, for the integrative portion 14 of moulding plastics inserts such as winding 12, skeleton 13, stator housing 11, the portion 14 of moulding plastics has first chamber 141 and second chamber 142, first chamber 141 and second chamber 142 do not communicate, first chamber 141 is located winding 12 top, second chamber 142 is located stator module 1's middle part, first chamber 141 and second chamber 142 are separated through the first cover body 143 of the portion 14 of moulding plastics. The circuit board 2 is located the first chamber 141, and winding 12 is connected with circuit board 2 electricity/signal connection, still is equipped with apron 15 above the first chamber 141, and apron 15 passes through welded fastening with the portion 14 of moulding plastics to through set up second sealing washer 6 between apron 15 and the portion 14 of moulding plastics in order to seal up first chamber 141, prevent that external steam, impurity etc. from getting into and influencing circuit board 2 normal work. The valve member 3 is at least partially located in the second cavity 142.

With reference to fig. 2, the valve unit 3 further includes a connecting member 35, a nut 36, a lead screw 37, and the electric valve further includes a compression nut 38. The sleeve 9 is located in the second cavity 142 and a portion of the sleeve 9 is located between the rotor assembly 31 and the stator assembly 1, providing isolation. The rotor assembly 31 is fixedly connected with one end of the screw rod 37. The inner wall of the nut 36 is provided with an internal thread section 361, the other end of the screw rod 37 penetrates through the nut 36 and is connected with the valve core 32, the outer peripheral wall of the screw rod 37 is provided with an external thread section matched with the internal thread section 361, and the internal thread of the screw rod 37 and the external thread of the nut 36 are matched with each other to convert the rotation of the rotor assembly into the movement of the valve core 32 in the axial direction. In this embodiment, the nut 36 is fixedly connected to the connecting member 35, the valve seat 33 is located in the valve body 4, and the valve element 32 is at least partially located in the valve seat 33. The coupling 35 has a flange 351, a lower end surface of the flange 351 abuts against the valve body 4, the compression nut 38 is fitted to a radial outer periphery of a main body side wall of the coupling 35, the compression nut 38 contacts an upper end surface of the flange 351, and the compression nut 38 is screwed to the valve body 4, so that the coupling 35 is fixedly connected to the valve body 4. The electric valve further comprises a pressing plate 7, the stator assembly 1 is fixedly connected with the valve body 4 through the pressing plate 7, the cross section of the pressing plate 7 is approximately L-shaped, one part of the pressing plate 7 is fixedly connected with the stator assembly 1, and the other part of the pressing plate 7 can be fixedly connected with the valve body 4 through the modes of threaded connection and the like. When the stator assembly 1 generates an excitation magnetic field, the rotor assembly 31 drives the screw rod 37 to rotate together under the action of the excitation magnetic field, meanwhile, the screw rod 37 and the nut 36 are in threaded fit, the valve core 32 can be driven to move axially, the valve core 32 changes the flow cross section area of the working medium at the valve port 331 by approaching and departing from the valve port 331, and then throttling and/or on-off of the working medium can be formed at the valve port 331.

Referring to fig. 1 and 2, the stator assembly 1 further has a recess 144, the recess 144 is formed by injection molding at the injection molding part 14, at least a part of the recess 144 is opened toward the valve body 4, the recess 144 is located between the valve member 3 and the stator assembly 1, the recess 144 is also located between the valve body 4 and the stator assembly 1, and specifically, the recess 144 is located at a position where the injection molding part 14 is close to the valve body 4 and the sleeve 9 and is located at the outer periphery of the sleeve 9. The electric valve 100 further comprises a support pad 34 and a first sealing ring 5, the support pad 34 is fixedly connected with the compression nut 38, the recess 144 is located between the support pad 34 and the injection molding part 14 when viewed from the axial direction, the recess 144 is located between the sleeve 9 and the injection molding part 14 when viewed from the radial direction, and the first sealing ring 5 is located in the recess 144. Referring to fig. 4, the recess 144 has a first mounting surface 1441, a second mounting surface 1442, and a connecting portion 1443, the first mounting surface 1441 is substantially perpendicular to the side wall of the main body of the sleeve 9, the first mounting surface 1441 is disposed opposite to the valve body 4, the second mounting surface 1442 is disposed opposite to the outer peripheral surface of the sleeve 9, the second mounting surface 1442 is connected to the first mounting surface 1441 by the connecting portion, the connecting portion 1443 is arc-shaped, the recess 144 may have no connecting portion, and the second mounting surface 1442 may be directly connected to the first mounting surface 1441. The outer side of the first seal ring 5 abuts against the second mounting surface 1442 in the radial direction, and the inner side of the first seal ring 5 abuts against the side wall of the sleeve 9; it is spacing that first sealing washer 5 passes through first installation face 1441 in axial direction, first sealing washer 5 be located supporting pad 34 top and with supporting pad 34 upper surface butt, first sealing washer 5 produces radial deformation through sleeve pipe 9 and stator module 1 and the extrusion of valve body 4. The supporting pad 34 is supported in gland nut 38, and gland nut 38 is connected with the valve body is spacing, and first sealing washer 5 supports in supporting pad 34, is equivalent to partly first sealing washer 5 and the indirect spacing of valve body 4, provides at least part support by valve body 4 to first sealing washer 5.

The compression nut 38 is constructed as shown in fig. 6, the outer peripheral wall of the compression nut 38 has an external thread (the external thread is not shown in the drawing), and the compression nut 38 has two recesses 381. The two recesses 381 have the function that a tool can act on the two recesses 381 to fix the compression nut 38 and the valve body 4 by screwing during assembly. In order to change original motorised valve structure as far as possible, increased supporting pad 34 on gland nut 38 structure basis in this embodiment, its structure is as shown in fig. 5, and supporting pad 34 mainly plays the supporting role to first sealing washer 5, makes the indirect butt of first sealing washer 5 in valve body 4 for first sealing washer is more stable firm. In order to restrict the rotation of the supporting pad 34 relative to the gland nut 38, the lower end of the supporting pad 34 is further provided with two positioning bosses 341, the positioning bosses 341 are matched with the pits 381 of the gland nut 38, the positioning bosses 341 of the supporting pad are pressed into the pits 381 of the gland nut 38, the limiting effect can be achieved on the supporting pad 34, and the damage to the first sealing ring 5 caused by the shaking or the rotation of the supporting pad 34 in the vibration process of the electric valve is reduced.

The first mounting surface 1441 and the second mounting surface 1442 are planar in this embodiment, the second mounting surface 1442 forms an included angle α with a side wall of the main body of the sleeve, the included angle α is greater than 0 ° and smaller than 90 °, the second mounting surface 1442 is located on a side away from the sleeve 9, in the direction shown in the drawing, one end of the concave portion 144 close to the winding 12 is narrow, and one end of the concave portion 144 close to the valve body 4/the support pad 34 is wide, and the structure is narrow at the top and wide at the bottom. Under the electric valve structure shown in the attached figure 1, in order to keep other structure sizes in the electric valve unchanged as much as possible and meet the requirement that the first sealing ring reaches a certain compression rate, such as 25% -35% compression rate, the included angle alpha can be selected to be 5-18 degrees under the condition of meeting the structural constraint. The size of the included angle alpha can be properly adjusted according to different sizes of the electric valve structures.

In fig. 4 the angle alpha is specifically 10 deg., and in fig. 4 some of the lines present in fig. 3 have been omitted. Of course, the first mounting surface 1441 and the second mounting surface 1442 are not limited to a plane (the plane in this specification is a broad plane, and includes a smooth plane, a flat surface with roughness observed by naked eyes, etc.), but may also be a curved surface with a radian, and at this time, the included angle α between the second mounting surface and the sleeve is the included angle between the tangent plane of the second mounting surface and the sleeve.

The technical scheme also provides an assembly method of the electric valve, which comprises the following steps:

assembling the valve part 3 and the sleeve 9 to form a valve part and sleeve assembly, assembling the valve part, the sleeve assembly and the valve body 4, and connecting the valve part, the sleeve assembly and the valve body 4 in a limiting way to form a valve seat assembly by screwing the compression nut 38; the supporting pad 34 is sleeved in from the upper end of the sleeve 9 and is contacted with the compression nut 38, and the positioning boss 341 of the supporting pad 34 is inserted into the concave pit 381 of the compression nut 38, so that the supporting pad 34 is limited by the compression nut 38.

The limit connection of the valve component, the sleeve assembly and the valve body comprises the following specific operations of forming a valve seat assembly by screwing the compression nut 38 to limit and connect the valve component, the sleeve assembly and the valve body 4: the compression nut 38 is sleeved from the upper end of the sleeve 9 to abut against the valve body 4, the compression nut 38 acts on the pit 381 of the compression nut 38 through a tool, and the compression nut 38 is fixedly connected with the valve body 4 through threads, so that the valve body 4 and the valve component and sleeve component are fixed.

The assembly of the first seal ring includes the first seal ring 5 being inserted from the upper end of the sleeve 9 against the support pad 34.

Stator module and valve body's spacing connection includes: the pressure plate 7 is fixedly connected with the stator assembly 1, the second cavity 142 of the stator assembly 1 is aligned with the sleeve 9, the concave part 144 is aligned with the position of the first sealing ring 5, downward force is applied to the stator assembly 1 to be pressed in until the pressure plate is abutted against the valve body 4 and the first sealing ring 5 is positioned in the concave part 144, and then the pressure plate 7 is fixedly connected with the valve body 4 through the screw 8.

The assembly of the electric valve also comprises the following steps that the stator assembly 1 and the circuit board 2 are assembled, and the cover plate 15 and the injection molding part 14 are sealed and welded and fixed through the second sealing ring 6; this step can be placed before or after the stator assembly is in positive connection with the valve body.

This embodiment is through setting up contained angle alpha, is convenient for push into the in-process of concave part 144 at first sealing washer 5 and discharges the interior air of concave part 144, reduces the assembly degree of difficulty, simultaneously, also reduces the wearing and tearing when first sealing washer 5 assembles. First sealing washer 5 after the assembly can to a certain extent with stator module mould plastics the metal material in the portion 14 isolated with external, reduce outside moisture or impurity and get into stator module 1 inside probably, reduce the risk that metal material such as winding 12, stator housing 11 corrodes and circuit board 2 damages. If the second mounting surface 1442 of the concave portion 144 does not deviate from the sleeve by the angle α, when the stator assembly 1 is mounted and the stator assembly 1 is sleeved downward toward the valve seat assembly, an air spring is easily formed between the concave portion 144 of the stator assembly and the valve seat assembly, and the stator assembly 1 is more and more difficult to sleeve. And even if the stator assembly 1 and the valve seat assembly are assembled by brute force, after the screw 8 of the pressing plate 7 is screwed, the formed air spring enables the stator assembly and the valve seat assembly to have the force of mutual separation for a long time, so that the pressing plate 7 for fixing the stator assembly 1 and the valve body 4 is continuously stressed, the pressing plate 7 is deformed, and the relative distance between the stator assembly and the valve seat assembly is increased.

The present technical solution further provides another embodiment of the electric valve, which is different from the previous embodiment in that in the present embodiment, the compression nut 38 and the support pad 34 are integrally designed, as shown in fig. 7, the compression nut and the support pad that are integrally designed are hereinafter referred to as an integrated piece 38a, the lower end of the integrated piece 38a is the compression nut of the first embodiment, the upper end of the integrated piece 38a is the support pad of the first embodiment, the whole integrated piece is also provided with two recesses 381a, the function of the whole integrated piece is the same as that of the recesses 381 of the first embodiment, and the tool can act on the two recesses 381a to screw and fix the integrated piece 38a and the valve body 4 by threads during assembly. Through being integrative with gland nut and supporting pad design, can simplify the assembly step (spacing connection of supporting pad and gland nut can omit), improve assembly efficiency.

The corresponding assembling method of the electric valve comprises the following steps:

assembling the valve component 3 and the sleeve to form a valve component and sleeve assembly, assembling the valve component and the sleeve assembly with the valve body 4, and connecting the valve component and the sleeve assembly with the valve body 4 in a limiting manner by screwing the integrated part 38a to form a valve seat assembly;

assembling the first seal ring, including inserting the first seal ring 5 from the upper end of the sleeve 9 and abutting against the upper end (corresponding to the support pad of the first embodiment) of the integrated piece 38 a;

stator module and valve body's spacing connection includes: the pressure plate 7 is fixedly connected with the stator assembly 1, the second cavity 142 of the stator assembly 1 is aligned with the sleeve 9, the concave part 144 is aligned with the position of the first sealing ring 5, downward force is applied to the stator assembly 1 to be pressed in until the pressure plate is abutted against the valve body 4 and the first sealing ring 5 is positioned in the concave part 144, and then the pressure plate 7 is fixedly connected with the valve body 4 through the screw 8.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.