CN111828760A

CN111828760A - Female joint

Info

Publication number: CN111828760A
Application number: CN202010720983.1A
Authority: CN
Inventors: 黄英文; 李致亮; 陈昌中; 谢洋; 潘超; 袁露
Original assignee: Gree Electric Appliances Inc of Zhuhai; Gree Wuhan Electric Appliances Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Gree Wuhan Electric Appliances Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-10-27

Abstract

The invention provides a female connector, relates to the technical field of connecting devices, and solves the technical problem that in the prior art, in the process of air conditioner production test, the operation is laborious when a male connector is assembled on the female connector. The female joint comprises a rocker component, a thimble structure and a shell structure, wherein the thimble structure is arranged in the shell structure, the rocker component is rotationally connected with the shell structure, and the rocker component can drive the thimble structure to move when rotating; when the male connector is inserted into the female connector, an interval exists between the ejector pin structure and the male connector, and the ejector pin structure can extrude the male connector to open a communication channel between the female connector and the male connector by rotating the rocker assembly. The invention is used for realizing joint butt joint with labor saving and high efficiency.

Description

Female joint

Technical Field

The invention relates to the technical field of connecting devices, in particular to a female joint.

Background

In actual production, when a pipe connection is required for testing, a quick-connect connection is typically used. Particularly, in the air conditioner production test, the butt joint test is carried out on the external unit and the standard internal unit through the quick connector. Along with the development of the society, the labor cost is improved, the requirement on the comfort of personnel operation is continuously improved, and the requirements on labor saving, rapidness and high efficiency of quick inflation connection for air conditioner production test are provided. Some existing technologies have certain effect on automatic falling of the joint, and certain manual labor intensity is reduced.

The patent publication No. CN203517108U discloses a female joint, wherein when the pressure is increased to 1MPa or above during the butt joint of the female joint and the male joint, the butt joint of the female joint and the male joint becomes very difficult, which is not beneficial to labor-saving operation, and the butt joint pressure of the joints is generally 1.5MPa or above during air-conditioning test, so that the butt joint process is laborious and inconvenient.

Disclosure of Invention

The invention aims to provide a female connector, which solves the technical problem that in the process of air conditioner production test in the prior art, the operation is labor-consuming when a male connector is assembled on the female connector. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

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

the invention provides a female joint which comprises a rocker assembly, a thimble structure and a shell structure, wherein the thimble structure is arranged in the shell structure, the rocker assembly is rotationally connected with the shell structure, and the rocker assembly can drive the thimble structure to move when rotating; when the male connector is inserted into the female connector, a space exists between the ejector pin structure and the male connector, and the ejector pin structure can extrude the male connector by rotating the rocker assembly so as to open a communication channel between the female connector and the male connector.

Preferably or optionally, the rocker assembly comprises an extrusion arc surface, the arc center of the extrusion arc surface deviates from the rotation center of the rocker assembly, and the ejector pin structure is driven to move along the axis direction of the female joint by the rotation of the extrusion arc surface.

Preferably or optionally, the rocker assembly comprises a circular turntable, a rocker rod and a rocker rod shaft, the rocker rod shaft is formed on two end faces of the circular turntable, the rocker rod shaft is supported on a rocker rod frame of the housing structure and is rotatably connected with the rocker rod frame, the rocker rod is connected to a circumferential surface of the circular turntable, and a partial region of the circumferential surface of the circular turntable forms the extrusion arc surface.

Preferably or optionally, the rocker subassembly still includes the gag lever post, the gag lever post sets up on the circumferential surface of circular carousel, the gag lever post overlaps with the cover and establishes rubber ring pad on the rocker frame contacts in order to be used for the restriction the hand lever continues to rotate along former direction.

Preferably or optionally, a rolling element is arranged between the rocker assembly and the thimble structure, and the rolling element can be driven to roll between the rocker assembly and the thimble structure when the rocker assembly rotates.

Preferably or optionally, an elastic device is arranged between the thimble structure and the housing structure, and the elastic device is used for realizing automatic resetting of the thimble structure.

Preferably or optionally, the shell structure includes a sleeve, the thimble structure is inserted into the sleeve, a hole check ring is arranged on the inner side wall of the sleeve, a step structure is formed on the inner side wall of the sleeve, a sealing seat bowl is arranged between the step structure and the hole check ring, and the sealing seat bowl can be in sealing fit with the thimble structure.

Preferably or optionally, a gas pipe joint is arranged on the female joint, a gas cavity is formed inside the female joint, and the gas pipe joint is communicated with the gas cavity; when gas is introduced into the gas cavity through the gas pipe connector, the gas in the gas cavity can extrude the ejection mechanism of the female connector so that the ejection mechanism extrudes the male connector to separate the male connector from the female connector.

Preferably or optionally, the housing structure includes a housing, a casing is disposed in the housing, the gas cavity is formed between the casing and the housing, the gas pipe joint is connected to the housing, and the ejection mechanism is located between the housing and the casing; the shell with be provided with between the casing and prevent the structure of mixing gas, prevent the structure of mixing gas and be used for preventing gas cavity's gas and refrigerant in the female joint from taking place to mix gas.

Preferably or optionally, a sealing ring groove is formed in the outer circumferential side surface of the casing, at least two sealing ring grooves are arranged in the axial direction of the casing, a sealing ring is arranged in each sealing ring groove and used for sealing the casing and the outer shell, an exhaust hole is formed in the outer shell, the position where the exhaust hole is communicated with the inner side surface of the outer shell is located between the two adjacent sealing ring grooves, and the sealing ring and the exhaust hole are used for forming the anti-air-leakage structure.

According to the female joint provided by the invention, when the male joint is assembled on the female joint, the distance exists between the male joint and the ejector pin structure, so that the installation pressure of the male joint is reduced, the rocker assembly is rotated, the ejector pin structure can move towards the direction close to the male joint along the axis direction of the female joint, a channel between the female joint and the male joint is opened in the moving process of the ejector pin structure, the rocker assembly is additionally arranged on the female joint to realize the communication between the female joint and the male joint, so that the butt joint of the male joint and the female joint is convenient, and the problem of high pressure of the male joint in the installation process is avoided.

The preferred technical scheme of the invention can at least produce the following technical effects:

the female connector is provided with the air pipe connector, the gas cavity is formed in the female connector, the air pipe connector is used for connecting compressed air, when the male connector is required to be separated from the female connector, the compressed gas can be introduced into the gas cavity through the air pipe connector, and under the action of the gas pressure in the gas cavity, the male connector is ejected out by the ejection mechanism in the female connector so as to realize automatic separation of the male connector and the female connector, so that the operation efficiency is improved, and the labor intensity is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a female connector provided in an embodiment of the present invention;

FIG. 2 is a schematic view of the assembly of the female connector and the male connector provided by the embodiment of the present invention (the female connector and the male connector are not in communication);

FIG. 3 is a schematic view of the assembly of the female connector and the male connector provided by the embodiment of the present invention (the female connector and the male connector are not in communication);

FIG. 4 is a schematic view of the assembly of the female connector and the male connector according to the present invention (the female connector and the male connector are in communication with each other);

FIG. 5 is a first schematic view of a first embodiment of the present invention showing the separation of a female connector from a male connector;

fig. 6 is a partial enlarged view B of fig. 5;

FIG. 7 is a second schematic view of a female connector and a male connector of the present invention during separation;

FIG. 8 is a partial schematic view C of FIG. 7;

FIG. 9 is a third schematic view of a female connector and a male connector of the present invention during separation;

FIG. 10 is a partial schematic view D of FIG. 9;

FIG. 11 is a fourth schematic view of a female connector and a male connector of the present invention during separation;

FIG. 12 is a partial schematic view E of FIG. 11;

FIG. 13 is a schematic view of a female connector and a male connector provided in accordance with an embodiment of the present invention in a fully separated configuration;

fig. 14 is a partial schematic view a of fig. 3.

FIG. 1-male connector; 2-cutting the ferrule; 3-a gasket; 4-a first spring; 5-a first steel wire retainer ring; 6-steel ball; 7-spring seats; 8-a second steel wire retainer ring; 9-a second spring; 10-a first O-ring; 11-a baffle plate; 12-a housing; 13-a third spring; 14-a second O-ring; 15-a third O-ring; 16-a fourth O-ring; 17-a push cylinder; 18-a housing; 19-a sleeve; 20-a thimble; 21-sealing a seat bowl; 22-retaining ring for hole; 23-top sleeve; 24-a fourth spring; 25-an adapter; 26-a fifth O-ring; 27-a third wire retainer ring; 28-a latch; 29-sixth O-ring; 30-ejector pin rear seat; 31-a fifth spring; 32-hex nut; 33-core pressing; 34-a rubber ring pad; 35-rocker frame; 36-a bearing; 37-a rocker assembly; 38-rocker shaft; 39-hand rocker; 40-a circular turntable; 41-a limiting rod; 42-a connector; 43-air pipe joint; 44-a gas chamber; 45-air vent.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Referring to fig. 1 to 14, the present invention provides a female joint, including a rocker assembly 37, an ejector pin structure and a housing structure, wherein the ejector pin structure is disposed in the housing structure, the rocker assembly 37 is rotatably connected to the housing structure, and the rocker assembly 37 can drive the ejector pin structure to move when rotating; when the male connector 1 is inserted into the female connector, there is a space between the pin structure and the male connector 1, and the pin structure can press the male connector 1 by rotating the rocker assembly 37 to open the communication channel between the female connector and the male connector 1. In the prior art, in the process of assembling the male connector to the female connector, the installation pressure of the male connector 1 is relatively large, and the condition of labor waste in installation exists; in the invention, the structure of the female joint is changed, and the rocker assembly 37 is utilized to open the communication channel between the female joint and the male joint 1, which comprises the following specific steps: when the male connector 1 is assembled on the female connector, an interval exists between the male connector 1 and the ejector pin structure, the channel on the male connector 1 and the channel on the female connector are not communicated (the installation pressure of the male connector 1 is reduced), the rocker assembly 37 is rotated, the ejector pin structure can move towards the direction close to the male connector 1 along the axis direction of the female connector, in the process of moving the ejector pin structure, the channel on the female connector is opened (a gap exists between the ejector pin structure and the sealing seat bowl 21), the ejector pin structure abuts against the sealing structure inside the male connector 1, so that the channel on the male connector 1 is opened, and then the communication channel between the female connector and the male connector 1 is opened. Through add rocker subassembly 37 on female joint to be used for realizing the intercommunication between female joint and the male joint 1, make male joint and female joint butt joint convenient, avoid male joint 1 to have the great problem of pressure in the installation.

As an optional implementation manner of the embodiment of the present invention, the principle that the rocker assembly 37 can drive the thimble structure to move is as follows: the rocker assembly 37 comprises an extrusion arc surface, the arc center of the extrusion arc surface is deviated from the rotation center of the rocker assembly 37, and the ejector pin structure is driven to move along the axis direction of the female joint by the rotation of the extrusion arc surface. Because the arc center of the extrusion arc surface is deviated from the rotation center of the rocker assembly 37, when the rocker assembly 37 rotates, the distance between the position where the extrusion arc surface contacts the bearing 36 and the rotation center of the rocker assembly 37 changes (the extrusion arc surface can also directly contact the pressing core 33), so that the extrusion arc surface can extrude the bearing 36 to drive the thimble structure to move towards the direction close to the male connector 1 along the axis direction of the female connector.

As an optional implementation manner of the embodiment of the present invention, the specific structure of the rocker assembly 37 is as follows: the rocker assembly 37 comprises a circular turntable 40, a hand lever 39 and a rocker shaft 38, the rocker shaft 38 is formed on two end faces of the circular turntable 40, the rocker shaft 38 is supported on a rocker frame 35 of the shell structure and is rotatably connected with the rocker frame 35, the circular turntable 40 is located in the rocker frame 35, the hand lever 39 is connected on the circumferential face of the circular turntable 40, and a partial area of the circumferential face of the circular turntable 40 forms an extrusion arc face. The rocker arm 35 is cylindrical and in order to avoid the rocker arm 35 from limiting the rotation of the rocker arm 39, the rocker arm 35 is provided with a groove so that the rocker arm 39 can rotate from the position illustrated in fig. 3 to the position illustrated in fig. 4. When the rocker assembly 37 is rotated, only a hand is needed to apply force to the hand lever 39, so that the thimble structure is conveniently pushed to move towards the direction close to the male connector 1, and the operation is labor-saving.

As an optional implementation manner of the embodiment of the present invention, the rocker assembly 37 further includes a limiting rod 41, the limiting rod 41 is disposed on a circumferential surface of the circular turntable 40, and the limiting rod 41 contacts with the rubber ring pad 34 sleeved on the rocker frame 35 to limit the hand lever 39 to continue to rotate along the original direction. In order to avoid interference between the stopper rod 41 and the rocker frame 35, a groove is also provided in the rocker frame 35 to engage with the stopper rod 41 so that the stopper rod 41 can rotate. In addition, the slot on the rocker arm 35 also prevents the circular turntable 40 from interfering with the rocker arm 35.

As an optional implementation manner of the embodiment of the present invention, a rolling element is disposed between the rocker assembly 37 and the thimble structure, and when the rocker assembly 37 rotates, the rolling element can be driven to roll between the rocker assembly 37 and the thimble structure. The rolling element may be a bearing 36, when the rocker assembly 37 rotates, the bearing 36 and the thimble structure can be driven to move along the axial direction of the female joint, meanwhile, the bearing 36 can also rotate, and the bearing 36 is used for reducing friction.

As an optional implementation manner of the embodiment of the present invention, an elastic device is disposed between the thimble structure and the housing structure, and the elastic device is configured to implement automatic resetting of the thimble structure. The housing structure includes a sleeve 19, a thimble 20 is inserted into the sleeve 19, and a fourth spring 24 is disposed between a thimble seat 30 and the sleeve 19, as shown in fig. 1, which illustrates that the fourth spring 24 is disposed between the thimble seat 30 and a hole retainer 22 on the sleeve 19, and when the thimble 20 is in the position illustrated in fig. 4, the fourth spring 24 is in a compressed state. In addition, referring to fig. 1, a fifth spring 31 is arranged between the rocker frame 35 and the pressing core 33, and the fifth spring 31 is also beneficial to the return of the thimble 20.

As an optional implementation manner of the embodiment of the present invention, referring to fig. 1, the housing structure includes a sleeve 19, the thimble 20 is inserted into the sleeve 19, a hole retaining ring 22 is disposed on an inner sidewall of the sleeve 19, a step structure is formed on the inner sidewall of the sleeve 19, a seal seat bowl 21 is disposed between the step structure and the hole retaining ring 22, and the seal seat bowl 21 can be in sealing fit with the thimble 20. Referring to fig. 1, the thimble 20 is shown in a sealing state with the seal seat bowl 21.

Referring to fig. 3, it is shown that the male connector 1 and the female connector are in an unconnected state, and at this time, the hand lever 39 is parallel to the axial direction of the female connector, and the position where the circular turntable 40 contacts the bearing 36 is relatively close to the rotation center of the circular turntable 40; referring to fig. 4, the state that the male connector 1 is communicated with the female connector is shown, at this time, the hand lever 39 is perpendicular to the axial direction of the female connector, and the position where the circular turntable 40 contacts with the bearing 36 is relatively far away from the rotation center of the circular turntable 40; when the rocker assembly 37 rotates from the position illustrated in fig. 3 and shown in fig. 4, the thimble 20 moves toward the male connector 1, and during the movement of the thimble 20, there is a gap between the thimble 20 and the seal seat bowl 21, and the thimble 20 abuts against the seal structure inside the male connector 1, so that the passage on the male connector 1 is opened. When the rocker assembly 37 is rotated from the position shown in fig. 4 and illustrated in fig. 3, the needle 20 is reset by the fourth spring 24, the needle 20 is sealed with the seal seat bowl 21, and the passage of the male connector 1 is closed.

As an optional implementation manner of the embodiment of the invention, a gas pipe connector 43 is arranged on the female connector, a gas cavity 44 is formed inside the female connector, and the gas pipe connector 43 is communicated with the gas cavity 44; when gas is introduced into the gas chamber 44 through the gas pipe connector 43, the gas in the gas chamber 44 can press the ejection mechanism of the female connector so that the ejection mechanism presses the male connector 1 to separate the male connector 1 from the female connector. The air pipe connector 43 is used for connecting compressed air, and the connector 42 is used for connecting air-conditioning refrigerant. When the male connector 1 needs to be separated from the female connector, compressed gas can be introduced into the gas cavity 44 through the gas pipe connector 43, the ejection mechanism moves under the action of gas pressure in the gas cavity 44, and the ejection mechanism pushes the male connector 1 to move in the moving process until the male connector 1 is separated from the female connector, so that the male connector 1 is automatically separated from the female connector.

As an optional implementation manner of the embodiment of the present invention, the housing structure includes a housing 18, a casing 12 is disposed in the housing 18, the casing 12 is disposed in the housing 18, a gas cavity 44 is formed between the casing 12 and the housing 18, a gas pipe connector 43 is connected to the housing 18, and an ejection mechanism is located between the housing 18 and the casing 12; an air leakage prevention structure is arranged between the shell 18 and the shell 12 and is used for preventing air in the air cavity 44 from being mixed with refrigerant in the female joint in an air leakage manner. The specific structure of the anti-air-leakage structure can be as follows: referring to fig. 3 and 14, a seal ring groove is formed on the outer circumferential side surface of the casing 12, at least two seal ring grooves are formed in the axial direction of the casing 12, a seal ring is arranged in each seal ring groove and used for sealing the casing 12 and the casing 18, referring to fig. 14, a fourth O-ring 16 is arranged in each seal ring groove, an exhaust hole 45 is formed in the casing 18, the position where the exhaust hole 45 is communicated with the inner side surface of the casing 18 is located between the two adjacent seal ring grooves, and the seal ring and the exhaust hole 45 are used for forming an anti-air-leakage structure. Referring to fig. 14, the shell 12 and the housing 18 are sealed by double O-rings, an exhaust hole 45 with a diameter of 0.8mm is designed between the two sealing rings, and when the fourth O-ring 16 on the left side is abnormal, the refrigerant leaks into the air through the exhaust hole 45 and does not contact with the compressed air; when the fourth O-ring 16 on the right side is abnormal, the compressed air leaks into the air through the air vent 45 and does not contact with the refrigerant, so that the phenomenon of air leakage between the refrigerant and the compressed air is avoided as much as possible.

Referring to fig. 5-13, the process of automatically separating the male connector 1 is illustrated, as follows:

referring to fig. 5 and 6, in order to introduce compressed air into the gas cavity 44, the compressed air extrudes the push cylinder 17, the third spring 13 is compressed under the limiting action of the baffle plate 11, the push cylinder 17 moves towards one side butted with the male connector 1 and pushes against the spring seat 7 to move together, due to the limiting action of the gasket 3, the spring seat 7 extrudes the first spring 4, and the cutting sleeve 2 moves towards one side butted with the male connector 1 under the action of the second spring 9;

referring to fig. 7 and 8, the third spring 13 is illustrated in a compressed state, the first spring 4 is compressed between the spring seat 7 and the washer 3, the steel ring of the spring seat 7 is gradually opened, and the male connector 1 cannot move in a direction of separating from the female connector when the steel ring is not completely opened;

referring to fig. 9 and 10, the push cylinder 17 is in contact with the baffle 11, the third spring 13 is compressed to the maximum, the steel ball 6 is positioned in the spring seat 7, and the gasket 3 and the male joint 1 move in the direction of separating from the female joint under the extrusion of the first spring 4 and the spring seat 7;

referring to fig. 11 and 12, the lower washer 3 and the male connector 1 continue to move in the direction of disengaging from the female connector under the action of the first spring 4 until the male connector 1 disengages from the female connector;

referring to fig. 13 and 2, the third spring 13 is extended, the push cylinder 17 is reset, and the spring seat 7 is abutted against the second wire retainer ring 8 under the action of the first spring 4.

According to the female joint, when the air conditioner is produced and tested, the butt joint of the male joint is labor-saving, the male joint can automatically fall off after the test is completed, the operation efficiency is improved, the labor intensity is reduced, and the operation comfort is improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A female joint is characterized by comprising a rocker component (37), a thimble structure and a shell structure, wherein,

the ejector pin structure is arranged in the shell structure, the rocker component (37) is rotatably connected with the shell structure, and the rocker component (37) can drive the ejector pin structure to move when rotating;

when the male connector (1) is inserted into the female connector, a space exists between the ejector pin structure and the male connector (1), and the ejector pin structure can extrude the male connector (1) by rotating the rocker assembly (37) so as to open a communication channel between the female connector and the male connector (1).

2. The female joint according to claim 1, wherein the rocker assembly (37) comprises an extruded circular arc surface, the circular arc center of the extruded circular arc surface is offset from the rotation center of the rocker assembly (37), and the ejector pin structure is driven to move along the axial direction of the female joint by the rotation of the extruded circular arc surface.

3. The box joint according to claim 2, wherein the rocker assembly (37) comprises a circular turntable (40), a rocker lever (39) and a rocker lever shaft (38), the rocker lever shaft (38) is formed on two end faces of the circular turntable (40), the rocker lever shaft (38) is supported on a rocker frame (35) of the housing structure and is rotatably connected with the rocker frame (35), the rocker lever (39) is connected on a circumferential face of the circular turntable (40), and a partial area of the circumferential face of the circular turntable (40) forms the extrusion arc face.

4. The female joint according to claim 3, wherein the rocker assembly (37) further comprises a limiting rod (41), the limiting rod (41) is arranged on the circumferential surface of the circular turntable (40), and the limiting rod (41) is in contact with a rubber gasket pad (34) sleeved on the rocker frame (35) to limit the hand rocker (39) to continuously rotate along the original direction.

5. The female joint according to any one of claims 1 to 4, wherein a rolling member is disposed between the rocker assembly (37) and the thimble structure, and the rocker assembly (37) can be driven to roll between the rocker assembly (37) and the thimble structure when rotating.

6. The female connector according to any one of claims 1 to 4, wherein an elastic means is provided between the pin structure and the housing structure, the elastic means being configured to achieve automatic resetting of the pin structure.

7. The female joint according to claim 6, wherein the housing structure comprises a sleeve, the thimble structure is inserted into the sleeve (19), a hole retainer ring (22) is arranged on the inner side wall of the sleeve (19) and a step structure is formed on the inner side wall of the sleeve (19), a sealing seat bowl (21) is arranged between the step structure and the hole retainer ring (22), and the sealing seat bowl (21) can be in sealing fit with the thimble structure.

8. The female joint according to claim 1, wherein a gas pipe joint (43) is arranged on the female joint, a gas cavity (44) is formed inside the female joint, and the gas pipe joint (43) is communicated with the gas cavity (44); when gas is introduced into the gas cavity (44) through the gas pipe connector (43), the gas in the gas cavity (44) can extrude the ejection mechanism of the female connector so that the ejection mechanism extrudes the male connector (1) to separate the male connector (1) from the female connector.

9. The box joint of claim 8, wherein the housing structure includes a housing (18), a housing (12) is disposed within the housing (18), the housing (12) is disposed within the housing (18) and the gas chamber (44) is formed between the housing (12) and the housing (18), the gas pipe joint (43) is connected to the housing (18), and the ejection mechanism is located between the housing (18) and the housing (12);

an anti-gas-leakage structure is arranged between the shell (18) and the shell (12), and is used for preventing gas in the gas cavity (44) and a refrigerant in the female joint from being mixed in a gas-leakage manner.

10. The female joint according to claim 9, wherein a seal ring groove is formed on an outer circumferential side surface of the housing (12), at least two seal ring grooves are formed in an axial direction of the housing (12), a seal ring is arranged in the seal ring groove and used for sealing the housing (12) and the outer shell (18), an exhaust hole (45) is formed in the outer shell (18), a position where the exhaust hole (45) is communicated with an inner side surface of the outer shell (18) is located between the two adjacent seal ring grooves, and the seal ring and the exhaust hole (45) are used for forming the air leakage prevention structure.