1. The utility model provides an automatic coupling's gas circuit connector comprises gas circuit UNICOM mechanism and closing mechanism, its characterized in that:

the opening and closing mechanism is a normally closed and ejecting valve mechanism, the normally closed is realized by a spring compression valve, and the valve is opened by ejecting a front sliding rod of the air channel communication mechanism when the coupler is combined;

the air channel communicating mechanism is a double-channel mutual coupling communicating mechanism and comprises a convex end communicating structure with a mandril and a concave end communicating structure with a front sliding rod, the mandril of the convex end communicating structure of one air connector is combined with the front sliding rod of the concave end communicating structure of the other air connector when the car coupler is combined, and the front sliding rod of the concave end communicating structure of one air connector is combined with the mandril of the convex end communicating structure of the other air connector to realize double-channel mutual coupling communication; the end face of each passage concave end communicating structure is in pressing contact with an outer end sealing ring arranged on the combining end face of the convex end communicating structure to realize sealing.

2. The gas circuit connector of an automatic coupler of claim 1, wherein: the rear end of the ejector rod of the convex end communicating structure is a spherical surface and is matched with the spherical concave surface of the convex end base of the convex end communicating structure to realize the swinging of the ejector rod.

3. The gas circuit connector of an automatic coupler of claim 2, wherein: the opening and closing mechanism includes: the gas circuit breaker comprises an annular base, an opening and closing valve body arranged in the base, a return spring sleeved on the opening and closing valve body and a gas circuit inlet arranged on the side wall of the base; the front end face of the opening and closing valve body is supported by a reset spring and is tightly pressed and combined with a front end seat connected with the annular base through a front end seat end face sealing ring to realize normal closing, and the front end face of the opening and closing valve body is also connected with a front sliding rod to drive and compress the spring when a coupler is combined, so that the opening and closing mechanism is opened by separating the front end face of the opening and closing valve body from the front end seat end face.

4. The gas circuit connector of an automatic coupler of claim 3, wherein: the rear end of an annular base of the opening and closing mechanism is provided with a rear end seat, the center of the rear end seat is provided with a sliding shaft, a rear sliding rod at the rear part of the opening and closing valve body is of a hollow structure, the inner wall of the rear sliding rod can slide along the sliding shaft, the rear end of the rear sliding rod is of a disc structure which is radially larger than the rear sliding rod, and a base end face sealing ring is arranged on the contact surface of the disc structure and the bottom end of the base to realize normally closed sealing of.

5. The gas circuit connector of an automatic coupler of claim 4, wherein: the rear end of the ejector rod is provided with an ejector rod resetting mechanism; the ejector rod resetting mechanism comprises a plurality of sets of radial floating springs and contacts, wherein the radial floating springs are arranged on the convex end base along the circumferential wall of the ejector rod at intervals, the radial floating springs are arranged in the radial direction, the rear ends of the radial floating springs are limited by bolts, the front ends of the radial floating springs are supported and arranged in the radial through holes, and the contacts are supported and combined with the edge of the circumferential wall of the spherical sliding ring at the rear end of the ejector rod.

6. The pneumatic connector of an automatic coupler of claim 5, wherein: the front end part of the convex end base is tightly pressed by a convex end cover to realize the end face annular end seal with the concave end communicating structure; the convex end cover presses the outer end sealing ring on the outer end surface of the pressure spring stop, and the rear end surface of the pressure spring stop is provided with an annular pressure spring which is tightly pressed on the radial sliding sleeve wing edge of the push rod rear end step structure.

7. The pneumatic connector of an automatic coupler of claim 5, wherein: a radial sealing ring arranged in the concave end communicating structure is tightly pressed on the end surface of the front end seat through an end cover and is fixed, and a through hole is formed in the side wall of an inner cavity of the front end seat and is communicated with an inner cavity of a convex end base of the convex end communicating structure; and a guide inclined plane for the ejector rod to enter is arranged on the inner side wall of the end cover inlet.

8. The pneumatic connector of an automatic coupler of claim 5, wherein: the front sliding rod and the rear sliding rod are in annular sealing connection, and a vent hole is reserved in the middle of the connection position and communicated with the inner cavity of the front sliding rod and the inner cavity of the rear sliding rod.

9. The pneumatic connector of an automatic coupler of claim 5, wherein: vent grooves are uniformly formed in the radial direction of the rod body of the front sliding rod; a front sliding rod sliding sleeve is arranged at the front part of the rod body of the front sliding rod; the front sliding rod sliding sleeve is in axial sliding fit in the inner hole of the front end seat.

10. The pneumatic connector of an automatic coupler of claim 5, wherein: the rear sliding rod is in sliding fit with the central sliding shaft of the rear end seat through a rear end seat sliding sleeve, and a ventilation groove is axially formed in the rear end seat sliding sleeve and is communicated with the inner cavity of the rear sliding rod and the inner cavity of the rear end seat.

Background

At present, the automatic coupler is mainly a tight-lock coupler used for a motor train and a subway, and the connection and the separation of a gas circuit connector interface are synchronously carried out with the coupling and the uncoupling of the coupler.

The existing automatic coupler often does not have the tight connection characteristic of a tight-lock coupler, the sealing performance cannot meet the requirement, and a gas circuit connector interface still deflects when the coupler is connected, so that the existing automatic coupler cannot adapt to the large precision tolerance condition of butt joint. And the requirement on the drift diameter of a gas path is larger on a railway freight car and a common speed passenger car, so the general type of the gas path connector of the tight-lock coupler is not good.

The Chinese application CN104358953 discloses an air duct connector for a tight-lock type car coupler for a vehicle, which comprises valve port rubber, a valve head, a pressure spring, a valve body, a sealing gasket, a tappet spring, a main air duct and an unhooking pipe, wherein the valve head is provided with a cylinder body extending towards the direction of the valve body, the cylinder body is sleeved on a valve hole seat of the valve body and is in sliding fit with the valve hole seat, a sealing ring is arranged between the cylinder body and the valve hole seat of the valve body, the pressure spring is sleeved outside the cylinder body, one end of the pressure spring is abutted against the valve head, the other end of the pressure spring is abutted against the valve body, the rear part of the unhooking pipe is inserted into an unhooking pipe hole of the valve body and is in sliding seal fit with the unhooking pipe hole, an unhooking pipe spring is arranged in the unhooking pipe hole, one end of the unhooking pipe spring is abutted against the rear end of the unhooking pipe, and the other end of the valve body wall at the bottom of the unhooking pipe hole is abutted against the valve body wall. The application adopts conventional end sealing, and the sealing performance can not meet the requirement.

Disclosure of Invention

The invention aims to provide a gas circuit connector suitable for an automatic coupler. The coupler has large gas path flux, can meet the coupling of various automatic couplers, has a floating ejector rod structure, reduces the influence of deflection conditions when the couplers are coupled, and realizes effective sealing butt joint of the gas paths of the couplers.

The invention is realized by the following technical scheme:

the utility model provides an automatic coupling's gas circuit connector comprises gas circuit UNICOM mechanism and closing mechanism, its characterized in that:

the opening and closing mechanism is a normally closed and ejecting valve mechanism, the normally closed is realized by a spring compression valve, and the valve is opened by ejecting a front sliding rod of the air channel communication mechanism when the coupler is combined;

the air channel communicating mechanism is a double-channel mutual coupling communicating mechanism and comprises a convex end communicating structure with a mandril and a concave end communicating structure with a front sliding rod, the mandril of the convex end communicating structure of one air connector is combined with the front sliding rod of the concave end communicating structure of the other air connector when the car coupler is combined, and the front sliding rod of the concave end communicating structure of one air connector is combined with the mandril of the convex end communicating structure of the other air connector to realize double-channel mutual coupling communication; the end face of each passage concave end communicating structure is in pressing contact with an outer end sealing ring arranged on the combining end face of the convex end communicating structure to realize sealing.

The rear end of the ejector rod of the convex end communicating structure is a spherical surface and is matched with the spherical concave surface of the convex end base of the convex end communicating structure to realize the swinging of the ejector rod.

The opening and closing mechanism includes: the gas circuit breaker comprises an annular base, an opening and closing valve body arranged in the base, a return spring sleeved on the opening and closing valve body and a gas circuit inlet arranged on the side wall of the base; the front end face of the opening and closing valve body is supported by a reset spring and is tightly pressed and combined with a front end seat connected with the annular base through a front end seat end face sealing ring to realize normal closing, and the front end face of the opening and closing valve body is also connected with a front sliding rod to drive and compress the spring when a coupler is combined, so that the opening and closing mechanism is opened by separating the front end face of the opening and closing valve body from the front end seat end face.

The rear end of an annular base of the opening and closing mechanism is provided with a rear end seat, the center of the rear end seat is provided with a sliding shaft, a rear sliding rod at the rear part of the opening and closing valve body is of a hollow structure, the inner wall of the rear sliding rod can slide along the sliding shaft, the rear end of the rear sliding rod is of a disc structure which is radially larger than the rear sliding rod, and a base end face sealing ring is arranged on the contact surface of the disc structure and the bottom end of the base to realize normally closed sealing of the rear end of the base.

The rear end of the ejector rod is provided with an ejector rod resetting mechanism; the ejector rod resetting mechanism comprises a plurality of sets of radial floating springs and contacts, wherein the radial floating springs are arranged on the convex end base along the circumferential wall of the ejector rod at intervals, the radial floating springs are arranged in the radial direction, the rear ends of the radial floating springs are limited by bolts, the front ends of the radial floating springs are supported and arranged in the radial through holes, and the contacts are supported and combined with the edge of the circumferential wall of the spherical sliding ring at the rear end of the ejector rod. The ejector rod resetting mechanism further comprises a pressure spring which is arranged on the step surface at the rear end of the ejector rod and is fixed with the convex end base in a limiting mode through the pressure spring stopper.

The front end part of the convex end base is tightly pressed by a convex end cover to realize the end face annular end seal with the concave end communicating structure; the convex end cover presses the outer end sealing ring on the outer end surface of the pressure spring stop, and the rear end surface of the pressure spring stop is provided with an annular pressure spring which is tightly pressed on the radial sliding sleeve wing edge of the push rod rear end step structure.

A radial sealing ring arranged in the concave end communicating structure is tightly pressed on the end surface of the front end seat through an end cover and is fixed, and a through hole is formed in the side wall of an inner cavity of the front end seat and is communicated with an inner cavity of a convex end base of the convex end communicating structure; and a guide inclined plane for the ejector rod to enter is arranged on the inner side wall of the end cover inlet.

The front sliding rod and the rear sliding rod are in annular sealing connection, and a vent hole is reserved in the middle of the connection position and communicated with the inner cavity of the front sliding rod and the inner cavity of the rear sliding rod.

Vent grooves are uniformly formed in the radial direction of the rod body of the front sliding rod; a front sliding rod sliding sleeve is arranged at the front part of the rod body of the front sliding rod; the front sliding rod sliding sleeve is in axial sliding fit in the inner hole of the front end seat.

The rear sliding rod is in sliding fit with the central sliding shaft of the rear end seat through a rear end seat sliding sleeve, and the rear end seat sliding sleeve is radially provided with a vent groove which is communicated with the inner cavity of the rear sliding rod and the inner cavity of the rear end seat.

The front sliding rod and the rear sliding rod of the air circuit connector are sealed with the base by adopting end face sealing, when the air circuit connector is in a cut-off state, the pressure of the pressure air acting on the front sliding rod and the rear sliding rod is basically the same, so that the pressure of the connector acting on the sealing is not influenced by the pressure of the pressure air and is adjusted only by the pressure of the reset spring.

The air vent is reserved between the front sliding rod and the rear sliding rod, when the air-circuit connector is in a connection passage state, pressure air flows into the inner cavity of the rear end seat through the air vent reserved between the front sliding rod and the rear sliding rod, the pressure of the pressure air acting on the front sliding rod and the rear sliding rod is kept basically the same, and the pressure of the connector acting on the seal is not influenced by the pressure of the pressure air and is only adjusted by the pressure of the reset spring.

The rod body of the front sliding rod is provided with a strip-shaped through hole, and the drift diameters of the inner cavity of the front sliding rod and the inner cavity of the front end seat are enlarged.

The radial sealing ring is arranged between the front end seat and the end cover, when the ejector rod of the air circuit connector extends into the front end seat and is in contact with the front sliding rod, the sealing ring already surrounds the rod body of the ejector rod, and when the ejector rod pushes the front sliding rod to open the air circuit, air pressure acts on the radial sealing ring to enable the sealing ring to be tightly pressed on the rod body of the ejector rod, so that the self-sealing effect of the air pressure is achieved.

The end cover is provided with a guiding inclined plane for guiding the ejector rod to enter the front end seat when the air circuit connector is in butt joint.

The convex end base and the spherical surface of the spherical surface sliding ring are in sealing fit with each other, so that the ejector rod can swing around the spherical center of the spherical surface at a certain angle. The convex end base is uniformly provided with a plurality of sets of radial floating springs and contact structures in the radial direction, so that the push rod can float in the radial direction through the end face of the spherical sliding ring and the end face of the radial sliding sleeve.

The gas circuit connector of the invention has the following advantages:

1) two-stage sealing is realized after the two air circuit connectors are butted, the sealing effect is good, the first stage is the sealing of the ejector rod body and the radial sealing ring, and the second stage is the sealing of the end cover and the outer end sealing ring.

2) The air path connector has a large air path, and the double-path design ensures that the overall path is not smaller than the path of the air main pipe of the railway passenger car and the freight car.

3) The ejector rod of the gas circuit connector adopts a floating structure, can float in the radial direction and can also rotate for a certain angle along the rear end of the ejector rod, so that reliable connection is ensured when the butt joint precision is not high.

4) The connection force of the air circuit connector is adjustable, and through the design of the base end face sealing ring and the front end seat end face sealing ring, the air pressure in the air circuit has no influence on the connection force of the air circuit connector, is only influenced by the spring pressure, and can be adjusted only by adjusting the spring pressure.

5) The gas circuit connector is not separated into one position and two positions when being installed on a vehicle, adopts an inter-embracing intercommunication structure, can realize good sealing and solve the one-position and two-position structure matching problem of a plug-in type connecting structure, realizes undifferentiated matching connection when a coupler of a railway vehicle is connected, and has simple installation and simplified operation.

6) The reserved air passage interface of the air passage connector is arranged on the side surface, the whole structure is short, and the compression stroke of the coupler is not influenced.

Drawings

FIG. 1 is a schematic view of a gas circuit connector;

FIG. 2 is a schematic diagram of the path status of the pneumatic connector;

FIG. 3 is a schematic view of the communication between two pneumatic connectors;

fig. 4 is a schematic view showing a state of an installation position of the gas circuit connector.

In the figure, 1 is a rear end seat, 2 is a rear end seat sliding sleeve, 3 is a rear sliding rod, 4 is a base end face sealing ring, 5 is a return spring, 6 is a base, 7 is a front end seat end face sealing ring, 8 is a front sliding rod, 9 is a front end seat, 10 is a front sliding rod sliding sleeve, 11 is a radial sealing ring, 12 is an end cover, 13 is a convex end base, 14 is a pressure spring, 15 is a push rod, 16 is a spherical sliding ring, 17 is a radial sliding sleeve, 18 is an outer end sealing ring, 19 is a pressure spring stopper, 20 is a convex end cover, 21 is a radial floating spring, 22 is a contact, 23 is a coupler, and 24 is a pneumatic connector.

Detailed Description

The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.

With reference to the attached drawings.

The air circuit connector of the automatic coupler consists of an air circuit communicating mechanism and an opening and closing mechanism. The opening and closing mechanism is a normally closed and ejecting valve mechanism, the normally closed is realized by a spring compression valve, and the valve is opened by ejecting a front sliding rod of the air channel communication mechanism when the coupler is combined;

the air channel communicating mechanism is a double-channel mutual coupling communicating mechanism, which comprises a convex end communicating structure with a mandril 15 and a concave end communicating structure with a front sliding rod 8, wherein the mandril 15 of the convex end communicating structure of one air connector is combined with the front sliding rod 8 of the concave end communicating structure of the other air connector when the car coupler is combined, and the front sliding rod 8 of the concave end communicating structure of one air connector is combined with the mandril 15 of the convex end communicating structure of the other air connector to realize double-channel mutual coupling communication; wherein, each passageway ejector pin 15 tightly combines at ejector pin 15 perisporium with the radial seal circle 11 that sets up in the concave end UNICOM structure and realizes sealedly, and the terminal surface of each passageway concave end UNICOM structure compresses tightly the contact with the outer end sealing washer 18 that the convex end UNICOM structure combination terminal surface set up and realizes sealedly.

The rear end of the ejector rod 15 of the convex end communicating structure is a spherical surface and is matched with the spherical concave surface of the convex end base of the convex end communicating structure to realize the swing of the ejector rod 15.

The opening and closing mechanism includes: the device comprises an annular base 6, an opening and closing valve body arranged in the base 6, a return spring 5 sleeved on the opening and closing valve body, and an air path inlet arranged on the side wall of the base 6; the front end face of the opening and closing valve body is supported by a reset spring 5 and is tightly pressed and combined with a front end seat 9 connected with an annular base 6 through a front end seat end face seal ring 7 to realize normal closing, the front end face of the opening and closing valve body is also connected with a front sliding rod 8 to be connected with a coupler to be combined to drive and compress the reset spring 5, and the front end face of the opening and closing valve body is separated from the end face of the front end seat 9 to realize opening and closing.

The rear end of an annular base 6 of the opening and closing mechanism is provided with a rear end seat 1, the center of the rear end seat 1 is provided with a sliding shaft, a rear sliding rod 3 at the rear part of the opening and closing valve body is of a hollow structure, the inner wall of the rear sliding rod 3 can slide along the sliding shaft, the rear end of the rear sliding rod 3 is of a disc structure which is radially larger than the rear sliding rod 3, and a base end face seal ring 4 is arranged on the contact surface of the disc structure and the bottom end of the base 6 to realize normally closed seal of the rear end of the base 6.

The rear end of the ejector rod 15 is provided with an ejector rod resetting mechanism; the ejector rod resetting mechanism comprises a plurality of sets of radial floating springs 21 and contacts 22 which are arranged along the circumferential wall of the ejector rod 15 at intervals on the convex end base 13, in the radial direction, each radial floating spring 21 is arranged in the radial direction, the rear end of each radial floating spring is installed and limited by a bolt, the front end of each radial floating spring supports and installs the contact 22 in a radial through hole, and the contact 22 is combined with the edge of the circumferential wall of the spherical sliding ring 16 at the rear end of the ejector rod 15 in a supporting manner.

The front end part of the convex end base 13 is tightly pressed by a convex end cover 20 to form an outer end sealing ring 18 so as to realize end face annular end sealing with the concave end communicating structure; the convex end cover 20 presses the outer end sealing ring 18 on the outer end surface of the pressure spring stop 19, and the rear end surface of the pressure spring stop 19 is provided with an annular pressure spring 14 which is pressed on the flange of the radial sliding sleeve 17 of the step structure at the rear end of the ejector rod 15.

A radial sealing ring 11 arranged in the concave end communicating structure is tightly pressed on the end surface of the front end seat 9 through an end cover 12 and fixed, and the side wall of the inner cavity of the front end seat 9 is provided with a through hole communicated with the inner cavity of the convex end base of the convex end communicating structure; the inner side wall of the inlet of the end cover 12 is provided with a guide inclined plane for the mandril to enter.

The front slide bar 8 is connected with the rear slide bar 3 in an annular sealing way, and a vent hole is reserved in the middle of the joint and is communicated with the inner cavity of the front slide bar 8 and the inner cavity of the rear slide bar 3.

The rod body of the front sliding rod 8 is uniformly provided with vent grooves in the radial direction; a front sliding rod sliding sleeve 10 is arranged at the front part of the rod body of the front sliding rod 8; the front sliding rod sliding sleeve 10 is axially and slidably matched in the inner hole of the front end seat 9.

The rear sliding rod 3 is in sliding fit with the central sliding shaft of the rear end seat 1 through a rear end seat sliding sleeve 2, and a vent groove is radially formed in the rear end seat sliding sleeve 2 and is communicated with the inner cavity of the rear sliding rod 3 and the inner cavity of the rear end seat 1.

As shown in fig. 1, the gas circuit connector 24 of the automatic coupler of this example includes: the device comprises a rear end seat 1, a rear end seat sliding sleeve 2, a rear sliding rod 3, a base end face sealing ring 4, a return spring 5, a base 6, a front end seat end face sealing ring 7, a front sliding rod 8, a front end seat 9, a front sliding rod sliding sleeve 10, a radial sealing ring 11, an end cover 12, a convex end base 13, a pressure spring 14, a push rod 15, a spherical sliding ring 16, a radial sliding sleeve 17, an outer end sealing ring 18, a pressure spring stopper 19, a convex end cover 20, a radial floating spring 21, a contact 22 and the like.

The sliding shaft rod body of the rear end seat 1 is provided with a rear end seat sliding sleeve 2 which extends into the inner hole of the rear sliding rod 3 to be matched with the inner hole in an axial sliding manner.

And a ventilation groove is reserved in the radial direction of the rear end seat sliding sleeve 2.

An air pipe connector is arranged on the side surface of the inner cavity of the base 6, and an air pipe of the vehicle is communicated with the air path butt joint connector through the air pipe connector. The base 6 is respectively connected with the rear end seat 1 and the front end seat 9 in a sealing way. And a base end face seal ring 4 is arranged on a through hole at the rear end of the base 6. The inner cavity end face of the base 6 presses the front slide bar 8 on the front end seat end face seal ring 7 arranged on the front end seat 9 through the reset spring 5, and simultaneously the rear slide bar 3 is also pressed on the base end face seal ring 4 arranged on the base 6. At this time, the inner cavity of the base 6, the inner cavities of the rear end seat 1 and the front end seat 9 are in a closed state, and the air path is disconnected.

The front sliding rod 8 is connected with the rear sliding rod 3 in a sealing way, and a vent hole is reserved at the joint. The inner cavity of the rear end seat 1 is communicated with the inner cavity of the front end seat 9. The body of the front sliding rod 8 is provided with a vent groove in the radial direction and is provided with a front sliding rod sliding sleeve 10. The front slide bar 8 is axially slidably fitted in the inner bore of the front end seat 9 by a front slide bar sliding sleeve 10.

The end face of the front end seat 9 is provided with a radial sealing ring 11 which is pressed tightly on the end face of the front end seat 9 through an end cover 12. The side surface of the inner cavity of the front end seat 9 is provided with a through hole which is connected with the air hole of the convex end base 13 in a sealing way.

The edge of the inner hole of the end cover 12 is provided with a guide slope.

The male end base 13 is sealingly connected to the male end cap 20. The convex end cover 20 presses the outer end sealing ring 18 on the outer end of the pressure spring stop 19, and the pressure spring stop 19 presses the pressure spring 14 on the wing edge of the radial sliding sleeve 17.

The hole of the convex end base 13 is provided with a spherical surface which is connected with the spherical surface of the spherical sliding ring 16 in a sealing way. The rear end face of the ejector rod 15 is connected with the end face of the spherical sliding ring 16 in a sealing mode. The ram 15 is slidable along the spherical surface of the convex end base 13 by a spherical sliding ring 16.

The convex end base 13 is uniformly provided with a radial floating spring 21 and a contact 22 in the radial direction, and the floating spring 21 presses the end surface of the contact 22. The contact 22 is pressed against the wing edge of the push rod 15, the push rod 15 can float radially through the end surface of the spherical sliding ring 16 and the end surface of the radial sliding sleeve 17, and the floating spring 21 and the contact 22 provide the radial floating return elastic force for the push rod 15.

As shown in fig. 2, in the open state of the air circuit connector 24, the rear slide bar 3 and the front slide bar 8 slide backward, the return spring 5 is compressed, the base 6 is communicated with the inner cavities of the rear end seat 1 and the front end seat 9, and the air circuit is in the open state.

As shown in fig. 3, after the two air circuit connectors 24 are connected, the push rod 15 pushes against the end surface of the front slide bar 8 and compresses the return spring 5 backwards, the front slide bar 8 and air enter the inner cavity of the front slide bar 8 and the inner cavity of the convex end base 13 through the gap between the base end surface sealing rings 4, and then respectively lead to the inner cavities of the push rods 15 of the two air circuit connectors 24, and the air circuits of the two air circuit connectors 24 are in a passage state. Meanwhile, the radial sealing ring 11 is tightly attached to the rod body of the ejector rod 15 due to air pressure to play a primary sealing role, and the outer end sealing ring 18 is pressed to the end face of the front end cover to play a secondary sealing role. When the two air circuit connectors 24 are separated, the return spring 5 presses the rear slide bar 3 and the front slide bar 8 on the base end face sealing ring 4 and the front end seat end face sealing ring 7 respectively, and the air circuit is disconnected.

As shown in fig. 4, a gas circuit connector 24 of the present invention is mounted at an intermediate position above coupler 23.

The working principle is as follows:

when the car couplers are connected, the air circuit connectors 24 respectively installed on the two car couplers are oppositely butted, the ejector rod 15 extends into the hole of the end cover 12 and then jacks the end surface of the front sliding rod 8 to push the front sliding rod 8 to move back and forth, the seal between the base 6 and the front end seat 9 is opened, the air circuit is communicated, and air flows into the front end seat 9 through the base 6. The ejector rod 15 of one air connector 24 and the radial sealing ring 11 of the other air connector 24 are tightly combined and attached to the shaft surface of the ejector rod 15 to form a primary radial seal, and the end cover 12 of one air connector 24 is pressed, contacted and sealed with the outer end sealing ring 18 of the other air connector 24 to form a secondary end seal. One path of air enters the inner hole of the mandril 15 through the inner hole of the front slide bar 8 and then flows to the inner cavity of the front end seat 9 of the other air circuit connector 24; the other air flows into the inner cavity of the front end seat 9 of the other air circuit connector 24 through the inner hole of the convex end base 13 and the inner hole of the mandril 15. The two paths of air are converged in the inner cavity of the front end seat 9 and then flow to the inner cavity of the base 6, and the inner cavities of the bases 6 of the two air circuit connectors 24 are communicated with each other to realize air communication.