A leak detection device and a switch machine

Abstract

The utility model discloses a kind of leak detection device and switch machine, leak detection device includes device shell, gas circuit control module and electrical control module;Device shell is provided with gas circuit control module and electrical control module;Gas circuit control module, the shell inner cavity of the external device needing to carry out leakage position detection is connected, for the air input of this external device shell inner cavity, so that external device shell inner cavity air pressure becomes positive air pressure;Electrical control module is connected with gas circuit control module, for gas circuit control module provides working electricity, and display the power supply state of gas circuit control module, and control to open or close gas circuit control module;External device is immersed in water.The utility model design science, can efficiently, reliably detect the leakage site of switch machine (specifically sealed switch machine) etc. external device, significantly improve the daily detection maintenance efficiency of switch machine, have great practical significance.

Description

Technical Field

[0001] This utility model relates to the technical field of railway turnout switching equipment, and in particular to a leak detection device and a switch machine, which is used to detect the leakage location (i.e., leak point) on a sealed switch machine. Background Technology

[0002] A switch machine is an important signaling infrastructure device used to reliably switch the position of a turnout, change the direction of the turnout, lock the turnout switch rail, and reflect the position and status of the turnout. It can effectively ensure traffic safety, improve transportation efficiency, and reduce the labor intensity of traffic operators.

[0003] To extend the service life of switch machines, sealed switch machines have emerged. Sealed switch machines are a new type of product that is an improvement and upgrade of the original switch machine. This product meets the requirements of IP67 protection level, and its sealing performance directly affects the condition of the internal parts of the switch machine and the service life of the switch machine.

[0004] Currently, for sealed switch machines with poor sealing performance (i.e., leak points), detecting the leak location requires immersing the switch machine in a water tank for a certain period, then disassembling it and examining the water ingress inside to locate and determine the leak point, followed by repair. This process is time-consuming, inefficient, and significantly increases the daily inspection and maintenance costs of switch machines.

[0005] Therefore, there is an urgent need to develop a technology that can efficiently and reliably detect leaks in switch machines (specifically, sealed switch machines), thereby improving the efficiency of daily inspection and maintenance of switch machines. Utility Model Content

[0006] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a leak detection device and a switch machine.

[0007] Therefore, this utility model provides a leak detection device, including a device housing, a gas path control module, and an electrical control module;

[0008] The device housing is equipped with a pneumatic control module and an electrical control module;

[0009] The air circuit control module is connected to the inner cavity of the housing of the external device that needs to detect the leak location. It is used to input air into the inner cavity of the outer device housing so that the air pressure in the inner cavity of the outer device housing becomes positive air pressure.

[0010] The electrical control module is connected to the gas circuit control module. It is used to provide working power to the gas circuit control module, display the power supply status of the gas circuit control module, and control the opening or closing of the gas circuit control module.

[0011] The external devices are submerged in water;

[0012] The device housing includes a grid;

[0013] The grid is located on the right side wall of the housing of the device.

[0014] As can be seen from the technical solution provided by this utility model above, compared with the prior art, this utility model provides a leak detection device and a switch machine. Its structure is scientifically designed and can efficiently and reliably detect the leakage points of external devices such as switch machines (specifically, sealed switch machines), significantly improving the efficiency of daily inspection and maintenance of switch machines, and has great practical significance.

[0015] After testing, it was found that this utility model utilizes an air pump to fill the inner cavity of the switch machine with gas, creating positive pressure within the cavity. The positive pressure value of the gas filling the inner cavity is precisely controlled by a pressure switch. By observing the bubbling areas of the switch machine in water, the leakage points of the switch machine can be quickly detected. The detection method is efficient and convenient. Attached Figure Description

[0016] Figure 1a A three-dimensional structural diagram of a leak detection device provided by this utility model;

[0017] Figure 1b A three-dimensional exploded disassembly diagram of a leak detection device provided by this utility model;

[0018] Figure 1c A three-dimensional structural diagram of the working state of a leak detection device provided by this utility model when connected to a sealed switch machine;

[0019] Figure 2 A schematic diagram of the gas path of a leak detection device provided by this utility model;

[0020] Figure 3 A schematic diagram of the control circuit of one embodiment of a leak detection device provided by this utility model;

[0021] Figure 4a A schematic diagram of the housing mechanism in a leak detection device provided by this utility model;

[0022] Figure 4b A schematic diagram of the grid mechanism in a leak detection device provided by this utility model;

[0023] Figure 5 A schematic diagram of the structure of the box cover in a leak detection device provided by this utility model;

[0024] Figure 6a A schematic diagram of the connector structure in a leak detection device provided by this utility model;

[0025] Figure 6b A schematic diagram of the disassembly and assembly of the handle in a leak detection device provided by this utility model;

[0026] Figure 6c A schematic diagram of the connector body in a leak detection device provided by this utility model;

[0027] Figure 7 A schematic diagram of the circuit control principle of the self-locking button S1 after it is pressed in a leak detection device provided by this utility model;

[0028] Figure 8 A schematic diagram of the circuit control principle for the switch machine cavity pressure reaching the set parameter A in a leak detection device provided by this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] See Figures 1a to 1c , Figures 2 to 3 , Figures 4a to 4b , Figure 5 , Figures 6a to 6c , Figures 7 to 8 This utility model provides a leak detection device for detecting leak locations (i.e. leak points) on external devices such as sealed turnouts. The device includes a housing, a gas path control module, and an electrical control module.

[0034] The device housing is equipped with a pneumatic control module and an electrical control module;

[0035] The air circuit control module is connected to the inner cavity of the housing of an external device (such as a sealed switch machine 12 or other sealed devices that need to detect leak locations (i.e., leak points) that needs to be detected) and is used to input air into the inner cavity of the housing of the external device (such as a sealed switch machine) so that the air pressure in the inner cavity of the housing of the external device becomes positive air pressure.

[0036] The electrical control module is connected to the gas circuit control module. It is used to provide working power to the gas circuit control module, display the power supply status of the gas circuit control module, and control the opening or closing of the gas circuit control module.

[0037] The external device is submerged in water (e.g., in a container filled with water).

[0038] In this utility model, the device housing includes a hollow shell 11 and a box cover 6;

[0039] The top of the housing 11 is open and is provided with a cover 6;

[0040] The air circuit control module includes an air pump 7, a pressure switch 8, an intermediate air tube 2, a three-way connector 3, and a connecting connector 1;

[0041] The electrical control module includes a battery 9 and an illuminated self-locking button 5;

[0042] The air pump 7, pressure switch 8, medium air pipe 2 and tee connector 3 in the air circuit control module and the battery 9 in the electrical control module are located inside the housing 11 of the device casing.

[0043] The top of the lid 6 is equipped with an illuminated self-locking button 5.

[0044] In practice, for the outer casing of the device, the top of the casing 11 is fixedly connected to the cover 6 by four screws 4;

[0045] In terms of specific implementation, such as Figure 4a As shown, four shell threaded holes 1101 are provided at the four corners of the top of the shell 11;

[0046] like Figure 5 As shown, a stepped through hole 602 is vertically provided at each of the four corners of the box cover 6;

[0047] Four threaded holes 1101 are provided corresponding to four stepped through holes 602;

[0048] After the screw 4 passes through the stepped through hole 602 on the cover 6, it is threadedly fixed to the housing threaded hole 1101 on the housing 11 corresponding to the position.

[0049] In specific implementation, for the outer shell of the device, a circular through hole 601 is vertically provided at the rear end of the cover 6;

[0050] A self-locking button with an indicator light is provided on the through hole 601 of the box cover.

[0051] In a specific implementation, the device housing also includes a grid 10;

[0052] The grid 10 is located on the right side wall of the housing 11.

[0053] In terms of specific implementation, such as Figure 4b As shown, annular protrusions 1001 are provided around the four edges of the grid 10;

[0054] The grid 10 has multiple circular grid through holes 1002 extending through the inner side of the annular protrusion 1001.

[0055] A circular first housing through hole 1102 is provided at the lower part of the rear end of the right side wall of the housing 11;

[0056] The grid 10 is disposed in the first housing through hole 1102.

[0057] Furthermore, the first housing through hole 1102 of the housing 11 is connected to the annular protrusion 1001 of the grid 10.

[0058] It should be noted that the annular protrusion 1001 of the grid 10 and the first housing through hole 1102 of the housing 11 are interference fit. The main function of the grid 10 is to enable the circulation of air inside and outside the housing 11 during the operation of the air pump 7.

[0059] In specific implementation, a circular second housing through hole 1103 is provided at the upper left end of the front side wall of the housing 11;

[0060] The intermediate air pipe 2 in the air circuit control module passes through the second housing through hole 1103;

[0061] It should be noted that the second housing through hole 1103 of the housing 11 is used to extend the air pipe 2 outward.

[0062] It should be noted that the air pipe 2 and the second housing through hole 1103 of the housing 11 are transition fit (for example, it can be clearance fit or interference fit).

[0063] In terms of specific implementation, for the gas circuit control module, the three-way connector 3 is a T-type three-way connector with three interfaces.

[0064] In specific implementation, for the air circuit control module, the air outlet of the air pump 7 is sealed and connected to the first interface on the three-way connector 3;

[0065] The second interface on the tee connector 3 is sealed to the air inlet on one side of the connector 1 via an air pipe 2.

[0066] The third port on the tee connector 3 is sealed to the air pressure detection port on the pressure switch 8 through a hollow connecting pipe.

[0067] The connector 1 is sealed to the inner cavity interface on the housing of the external device (e.g., a sealed switch machine 12, or other sealed device that needs to detect leaks) that needs to be leaked (i.e., leak point).

[0068] The air outlet on the other side of connector 1 is connected to the inner cavity of the outer device housing through this inner cavity interface;

[0069] The air pump 7 is used to input air into the inner cavity of the housing of an external device (such as a sealed switch machine or other sealed devices that need to detect leaks) through the tee connector 3, the air pipe 2 and the butt connector 1, so that the air pressure in the inner cavity of the external device housing becomes positive air pressure.

[0070] Furthermore, the external device is preferably a sealed switch machine.

[0071] In specific implementation, for the air circuit control module, pressure switch 8 is used to connect to the inner cavity of the outer device (e.g., a sealed switch machine) housing through three-way connector 3, air pipe 2 and connector 1, and to detect the pressure value (i.e., positive pressure value) of the inner cavity of the outer device (e.g., a sealed switch machine) housing.

[0072] In terms of specific implementation, for the gas path control module, see [link / reference]. Figures 6a to 6cAs shown, connector 1 includes connector body 104 and sealing ring 106;

[0073] The connector body 104 is sealed to the inner cavity interface on the housing of the external device (e.g., a sealed switch machine) that needs to detect the leak location (i.e., the leak point);

[0074] Among them, an annular groove 1043 is provided on the cylindrical surface around one end of the connector body 104;

[0075] A sealing ring 106 is provided on the annular groove 1043 of the connector body 104;

[0076] An annular groove 1043 is located inside the inner cavity interface of the outer device (e.g., a sealed switch machine) housing, and an elastic sealing ring 106 is provided between the two.

[0077] It should be noted that the two sides of the elastic sealing ring 106 abut against the annular groove 1043 and the side opposite to the inner cavity interface of the external device (i.e., they are in tight contact).

[0078] Furthermore, the sealing ring 106 is a Y-type sealing ring;

[0079] Furthermore, a threaded through hole 1041 is provided at the axial center position of the connector body 104;

[0080] One end of the threaded through hole 1041 on the connector body 104 is threadedly and sealed to the threaded part of one end of the hollow air pipe interface 101.

[0081] The other end of the tracheal inlet 101 is sealed and connected to one end of the central air tube 2;

[0082] Furthermore, the connector 1 also includes a disassembly handle 102, a nut 103, and an elastic washer 105;

[0083] A threaded blind hole 1042 is provided on the other end face of the connector body 104;

[0084] One end of the disassembly handle 102 has a connecting rod, and the outer end of the connecting rod has an external thread 1021;

[0085] The external thread 1021 on the disassembly handle 102 is threadedly connected to the blind thread hole 1042 on the connector body 104, and is fastened by the nut 103 and the elastic washer 105.

[0086] The nut 103 is threadedly connected to the external thread 1021 on the disassembly handle 102;

[0087] The elastic washer 105 is located between the nut 103 and the connector body 104;

[0088] The two sides of the elastic washer 105 abut against the opposite side of the nut 103 and the connector body 104 (i.e., they are in tight contact).

[0089] It should be noted that the disassembly handle 102 is used to allow workers to easily install and disassemble the connector 1 with the inner cavity interface on the housing of the external device (such as a sealed switch machine) that needs to be tested for leak locations (i.e., leak points).

[0090] For specific implementation details, see [link / reference] Figure 3 As shown, for the electrical control module, the illuminated self-locking button 5 includes a self-locking button S1 and an indicator light 1HL;

[0091] For the electrical control module, the positive terminal of battery 9 is connected to the thirteenth contact 13 of the self-locking button S1;

[0092] The fourteenth contact 14 of the self-locking button S1 is connected to the fifth contact 05 of the indicator light 1HL and the first contact 01 of the pressure switch 8, respectively.

[0093] The negative terminal of battery 9 is connected to the sixth contact 06 of indicator light 1HL and the positive power supply contact 03 of air pump 7, respectively.

[0094] The second contact 02 of the pressure switch 8 is connected to the negative power supply contact 04 of the air pump 7.

[0095] Furthermore, for the gas circuit control module, a pressure parameter value A is preset on the pressure switch 8;

[0096] When the pressure value (i.e., positive pressure value) detected by the pressure switch 8 in the inner cavity of the housing of an external device (e.g., a sealed switch machine) reaches (e.g., equal to or greater than) the pressure parameter value A, the normally closed first contact 01 and normally closed second contact 02 of the pressure switch 8 are disconnected.

[0097] It should be noted that the first contact 01 and the second contact 02 of the pressure switch 8 are normally closed contacts.

[0098] Furthermore, the pressure parameter value A of the pressure switch 8 is preferably 10 kPa.

[0099] It should be noted that, see Figure 7 As shown, when the operator presses the self-locking button S1 in the illuminated self-locking button 5, the fifth contact 05 of the indicator light 1HL of the illuminated self-locking button 5 is connected to the positive terminal of the battery 9 through the self-locking button S1, and the sixth contact 06 of the indicator light 1HL is connected to the negative terminal of the battery 9 through the wire. At this time, the indicator light 1HL lights up, indicating that the system is powered on.

[0100] At this time, the positive power supply contact 03 of the air pump 7 is successively connected to the positive terminal of the battery 9 through the second contact 02 and the first contact 01 of the pressure switch 8, the fourteenth contact 14 and the thirteenth contact 13 of the self-locking button S1. The negative power supply contact 04 of the air pump 7 is connected to the negative terminal of the battery 9 through a wire, and the air pump 7 starts to work, and starts to fill the inner cavity of an external device (such as a sealed switch machine) that needs to detect the leakage position (i.e., the leakage point) with gas. The pressure switch 8 starts to monitor the positive pressure value in the inner cavity of the external device housing. When the positive pressure value in the inner cavity of the external device (such as a sealed switch machine) housing reaches the pressure parameter value A preset on the pressure switch 8, the first contact 01 and the second contact 02 of the pressure switch 8 are disconnected, and then the working circuit of the air pump 7 is disconnected, and the air pump 7 stops working, that is, it no longer fills the inner cavity of the external device (such as a sealed switch machine) housing with gas. During this process, the bubbling position of the external device (such as a sealed switch machine) in water is the leakage point of the external device (such as a sealed switch machine).

[0101] It should be further noted that for the sealed switch machine, the parameter A set by the pressure switch 8 cannot be too large or too small; because the protection level of the sealed switch machine can reach IP67, that is, when the switch machine is 1 m underwater, the switch machine should not let water in. When the switch machine is 1 m underwater, the pressure difference between the inner cavity and the outside of the switch machine is about 10 kPa. Therefore, the pressure parameter value A of the pressure switch 8 can be correspondingly set to 10 kPa.

[0102] To understand the present invention more clearly, the technical principle and working mechanism of the illuminated self-locking button 5 will be explained below.

[0103] In the present invention, specifically, the illuminated self-locking button 5 is a mature conventional electrical device in the prior art. For example, an illuminated self-locking button with the model number XB2BW33B1C produced by Schneider Electric Co., Ltd. can be used. Its function in the present invention is to connect or disconnect the working power supply of the leakage point detection device supporting the sealed switch machine of the present invention and indicate the power supply state of the leakage point detection device.

[0104] Among them, the illuminated self-locking button 5 is composed of two parts, a self-locking button S1 and an indicator light 1HL, and includes four contacts, namely the thirteenth contact 13 and the fourteenth contact 14 of the self-locking button S1 and the fifth contact 05 and the sixth contact 06 of the indicator light 1HL.

[0105] It should be noted that the thirteenth contact 13 and the fourteenth contact 14 of the self-locking button S1 are normally open contacts.

[0106] The working principle of the self-locking button S1 is as follows: When the operator presses and releases the button, it is held in place by its own locking mechanism, which closes the thirteenth contact 13 and the fourteenth contact 14 of the self-locking button S1. At this time, the self-locking button S1 is used to connect the working power of the leak detection device of this utility model. When the operator presses and releases the button again, the self-locking button S1 will disconnect its own locking mechanism, opening the thirteenth contact 13 and the fourteenth contact 14 of the self-locking button S1. At this time, the self-locking button S1 is used to turn off the working power of the leak detection device of this utility model.

[0107] To better understand this utility model, the technical principle and working mechanism of the pressure switch 8 are explained below.

[0108] In this utility model, specifically, the pressure switch 8 is a conventional electrical device with mature existing technology. For example, a pressure switch with model number QPM11-NC-01 produced by Noker Pneumatic Co., Ltd. can be used. Its function is to disconnect the working circuit of the air pump 7 when the positive pressure in the inner cavity of the switch machine housing reaches the preset pressure parameter value A, so that the air pump 7 stops working.

[0109] Among them, the first contact 01 and the second contact 02 of the pressure switch 8 are normally closed contacts. The working principle of the pressure switch 8 is as follows: when the pressure inside the switch housing increases, the diaphragm inside the pressure switch deforms. When the pressure reaches the set value (i.e., the preset pressure parameter value A), the diaphragm inside the pressure switch drives the first contact 01 and the second contact 02 through the pull rod inside the pressure switch, so that the first contact 01 and the second contact 02 are disconnected.

[0110] It should be noted that the set pressure parameter value A of the pressure switch 8 is: the set value reached by inflating the internal cavity of the external device (e.g., a sealed switch machine) housing with air through the air pump 7. The function of this value is: when the internal cavity of the external device (e.g., a sealed switch machine) housing is inflated to the set value, the diaphragm inside the pressure switch 8 deforms, thereby disconnecting the first contact 01 and the second contact 02 of the pressure switch 8.

[0111] See Figure 8 As shown, when the pressure inside the switch machine housing reaches the pressure parameter value A preset on the pressure switch 8, the first contact 01 and the second contact 02 of the pressure switch 8 are disconnected, thereby disconnecting the working circuit of the air pump 7 and causing the air pump 7 to stop working, that is, no longer filling the housing of the external device (e.g., a sealed switch machine) with gas.

[0112] Based on the leak detection device provided by this utility model, this utility model also provides a switch machine, which includes the leak detection device as described above.

[0113] In practice, the switch machine is a sealed switch machine 12, and the inner cavity interface on its housing is sealed to the connector 1 in the air circuit control module.

[0114] In summary, compared with the prior art, this utility model provides a leak detection device and a switch machine. Its structure is scientifically designed and can efficiently and reliably detect leaks in external devices such as switch machines (specifically, sealed switch machines), significantly improving the efficiency of daily inspection and maintenance of switch machines, and has significant practical significance.

[0115] After testing, it was found that this utility model utilizes an air pump to fill the inner cavity of the switch machine with gas, creating positive pressure within the cavity. The positive pressure value of the gas filling the inner cavity is precisely controlled by a pressure switch. By observing the bubbling areas of the switch machine in water, the leakage points of the switch machine can be quickly detected. The detection method is efficient and convenient.

[0116] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A leak detection device, characterized in that, Includes the device housing, pneumatic control module, and electrical control module; The device housing is equipped with a pneumatic control module and an electrical control module; The air circuit control module is connected to the inner cavity of the housing of the external device that needs to detect the leak location. It is used to input air into the inner cavity of the outer device housing so that the air pressure in the inner cavity of the outer device housing becomes positive air pressure. The electrical control module is connected to the gas circuit control module. It is used to provide working power to the gas circuit control module, display the power supply status of the gas circuit control module, and control the opening or closing of the gas circuit control module. The external devices are submerged in water; The device housing includes a grid (10). The grid (10) is set on the right side wall of the housing (11) of the device housing.

2. The leak detection device as described in claim 1, characterized in that, The device housing includes a hollow shell (11) and a lid (6). The top of the housing (11) is open and is provided with a lid (6). The air circuit control module includes an air pump (7), a pressure switch (8), an air hose (2), a three-way connector (3), and a butt connector (1); The electrical control module includes a battery (9) and an illuminated self-locking button (5); The air pump (7), pressure switch (8), medium air pipe (2) and three-way connector (3) in the air circuit control module and the battery (9) in the electrical control module are located in the inner cavity of the housing (11) of the device casing; The top of the lid (6) is equipped with a self-locking button with an indicator light (5).

3. The leak detection device as described in claim 2, characterized in that, For the outer casing of the device, the top of the casing (11) is fixedly connected to the cover (6) by four screws (4); Four housing threaded holes (1101) are provided at the four corners of the top of the housing (11). A stepped through hole (602) is vertically provided at each of the four corners of the box cover (6); Four threaded holes (1101) are provided corresponding to four stepped through holes (602); After the screw (4) passes through the stepped through hole (602) on the cover (6), it is threadedly fixed to the housing threaded hole (1101) on the housing (11) corresponding to the position; And / or, For the outer casing of the device, a circular through hole (601) is provided vertically through the rear end of the cover (6). A self-locking button with an indicator light (5) is provided on the through hole (601) of the box cover.

4. The leak detection device as described in claim 2, characterized in that, For the device housing, the grid (10) is provided with annular protrusions (1001) around its four edges. The grid (10) has multiple circular grid through holes (1002) through it in the direction inside the annular protrusion (1001). A circular first housing through hole (1102) is provided at the lower part of the rear end of the right side wall of the housing (11). The first housing through hole (1102) of the housing (11) is connected to the annular protrusion (1001) of the grid (10); And / or, A circular second housing through hole (1103) is provided at the upper left end of the front side wall of the housing (11). The air pipe (2) in the air circuit control module passes through the second housing through hole (1103).

5. The leak detection device as described in claim 2, characterized in that, For the air circuit control module, the air outlet of the air pump (7) is sealed to the first interface on the three-way connector (3); The second port on the tee connector (3) is sealed to the air inlet on one side of the connector (1) through a medium air pipe (2); The third port on the tee connector (3) is sealed to the air pressure detection port on the pressure switch (8) through a hollow connecting pipe; The connector (1) is sealed to the inner cavity interface on the outer device housing.

6. The leak detection device as described in any one of claims 2 to 5, characterized in that, The connector (1) includes a connector body (104) and a sealing ring (106). The connector body (104) is sealed to the inner cavity interface on the outer device housing; Among them, an annular groove (1043) is provided on the cylindrical surface around one end of the connector body (104). A sealing ring (106) is provided on the annular groove (1043) of the connector body (104). An annular groove (1043) is located inside the inner cavity interface of the outer device housing, and an elastic sealing ring (106) is provided between the two.

7. The leak detection device as described in claim 6, characterized in that, A threaded through hole (1041) is provided at the axial center position of the connector body (104). One end of the threaded through hole (1041) on the connector body (104) is threadedly and sealed to the threaded part of the hollow air pipe interface (101). The other end of the tracheal inlet (101) is sealed to one end of the central air tube (2); And / or, The connector (1) also includes a disassembly handle (102), a nut (103) and a resilient washer (105). A threaded blind hole (1042) is provided on the other end face of the connector body (104). One end of the disassembly handle (102) has a connecting rod, the outer end of which has an external thread (1021). The external thread (1021) on the disassembly handle (102) is threadedly connected to the threaded blind hole (1042) on the connector body (104), and is fastened by a nut (103) and an elastic washer (105); The nut (103) is threadedly connected to the external thread (1021) on the disassembly handle (102); The elastic washer (105) is located between the nut (103) and the connector body (104); The two sides of the elastic washer (105) abut against the opposite sides of the nut (103) and the connector body (104), respectively.

8. The leak detection device as described in any one of claims 2 to 5, characterized in that, For the electrical control module, the illuminated self-locking button (5) includes a self-locking button S1 and an indicator light 1HL; For the electrical control module, the positive terminal of the battery (9) is connected to the thirteenth contact (13) of the self-locking button S1; The fourteenth contact (14) of the self-locking button S1 is connected to the fifth contact (05) of the indicator light 1HL and the first contact (01) of the pressure switch (8), respectively; The negative terminal of the battery (9) is connected to the sixth contact (06) of the indicator light 1HL and the positive power supply contact (03) of the air pump (7), respectively; The second contact (02) of the pressure switch (8) is connected to the negative power supply contact (04) of the air pump (7).

9. A switch machine, characterized in that, Includes the leak detection device as described in any one of claims 1 to 8.

10. The switch machine as described in claim 9, characterized in that, The switch machine is a sealed switch machine, and its inner cavity interface on the housing is sealed to the connector (1) in the air circuit control module.

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