Leakage point detection device and point switch

Abstract

The invention discloses a leakage point detection device and a point switch. The leakage point detection device comprises a device shell, a gas circuit control module and an electrical control module. A gas circuit control module and an electrical control module are arranged on the device shell; the air path control module is connected with a shell inner cavity of an external device needing leakage position detection and is used for inputting air into the shell inner cavity of the external device, so that the air pressure of the shell inner cavity of the external device becomes positive air pressure; the electrical control module is connected with the gas path control module and used for providing working electricity for the gas path control module, displaying the power supply state of the gas path control module and controlling the gas path control module to be opened or closed; and the external device is immersed in water. The method is scientific in design, can efficiently and reliably detect leakage parts of external devices such as the switch machine (particularly a sealed switch machine) and the like, remarkably improves the daily detection and maintenance efficiency of the switch machine, and has great practical significance.

Description

Technical Field

[0001] The present invention relates to the technical field of railway switch conversion equipment, and particularly to a leakage point detection device and a switch machine, which are applied to detect the leakage position (i.e., the leakage point) on a sealed switch machine. Background Art

[0002] A switch machine is an important signal basic equipment for reliably converting the position of a switch, changing the opening direction of the switch, locking the switch tongue rail, and reflecting the position and state of the switch. It can well ensure the safety of train operation, improve the transportation efficiency, and reduce the labor intensity of train operation personnel.

[0003] In order to extend the service life of the switch machine, a sealed switch machine has emerged accordingly. The sealed switch machine is a new product improved and upgraded on the basis of the original switch machine. This product can meet the requirements of protection level IP67, and its sealing performance directly affects the state of the internal parts of the switch machine and the service life of the switch machine product.

[0004] Currently, for a sealed switch machine with poor sealing performance (i.e., there is a leakage point), in order to detect its leakage position (i.e., the leakage point), it is necessary to put the switch machine product into a water tank, soak it for a certain period of time, and then disassemble the switch machine. By checking the traces of water ingress inside the switch machine product, the leakage part of the product is found and judged, and then the leakage part of the product is repaired. Therefore, it takes a lot of time, the detection efficiency is low, and the daily detection and maintenance cost of the switch machine is significantly increased.

[0005] Therefore, there is an urgent need to develop a technology at present, which can efficiently and reliably detect the leakage part of the switch machine (specifically, the sealed switch machine), and then improve the daily detection and maintenance efficiency of the switch machine. Summary of the Invention

[0006] The purpose of the present invention is to provide a leakage point detection device and a switch machine in view of the technical defects existing in the prior art.

[0007] To this end, the present invention provides a leakage point detection device, which includes a device housing, a gas path control module, and an electrical control module;

[0008] The gas path control module and the electrical control module are arranged on the device housing;

[0009] The gas path control module is connected to the inner cavity of the housing of an external device that needs to detect the leakage position, and is used to input air into the inner cavity of the housing of the external device, so that the air pressure in the inner cavity of the housing of the external device becomes a positive air pressure;

[0010] The electrical control module is connected to the gas circuit control module, used to supply 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] Among them, the external device is immersed in water.

[0012] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a leak point detection device and a switch machine, the structure design of which is scientific, and can efficiently and reliably detect the leakage parts of external devices such as switch machines (specifically, sealed switch machines), significantly improving the daily detection and maintenance efficiency of switch machines, and having great practical significance.

[0013] After inspection, for the present invention, by using an air inflation pump to fill the inner cavity of the switch machine with gas to form a positive pressure in the inner cavity of the switch machine, accurately controlling the positive pressure value of the gas filled into the inner cavity of the switch machine through a pressure switch, and by checking the bubbling parts of the switch machine in water, the leakage parts of the switch machine can be quickly detected, and the detection method is efficient and convenient. Description of the Drawings

[0014] Figure 1a It is a three-dimensional structure schematic diagram of a leak point detection device provided by the present invention;

[0015] Figure 1b It is a three-dimensional exploded decomposition structure schematic diagram of a leak point detection device provided by the present invention;

[0016] Figure 1c It is a three-dimensional structure schematic diagram of the working state when a leak point detection device provided by the present invention is connected to a sealed switch machine;

[0017] Figure 2 It is a gas circuit schematic diagram of a leak point detection device provided by the present invention;

[0018] Figure 3 It is a schematic diagram of the control circuit of an embodiment in a leak point detection device provided by the present invention;

[0019] Figure 4a It is a schematic diagram of the mechanism of the housing in a leak point detection device provided by the present invention;

[0020] Figure 4b It is a schematic diagram of the mechanism of the grid in a leak point detection device provided by the present invention;

[0021] Figure 5 It is a structural schematic diagram of the box cover in a leak point detection device provided by the present invention;

[0022] Figure 6a It is a structural schematic diagram of the docking head in a leak point detection device provided by the present invention;

[0023] Figure 6b Schematic structural diagram of the disassembly and assembly handle in a leak point detection device provided by the present invention;

[0024] Figure 6c Schematic structural diagram of the joint body in a leak point detection device provided by the present invention;

[0025] Figure 7 Schematic diagram of the circuit control principle after the self-locking button S1 is pressed in a leak point detection device provided by the present invention;

[0026] Figure 8 Schematic diagram of the circuit control principle when the pressure in the inner cavity of the switch machine reaches the set parameter A in a leak point detection device provided by the present invention. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In the description of this patent, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0030] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0031] See Figures 1a to 1c 、 Figures 2 to 3 、 Figures 4a to 4b 、 Figure 5 、 Figures 6a to 6c 、 Figures 7 to 8 , the present invention provides a leak point detection device, which is applied to detect the leakage position (i.e., the leak point) on an external device such as a sealed switch. The device includes a device housing, a gas path control module, and an electrical control module;

[0032] The gas path control module and the electrical control module are provided on the device housing;

[0033] The gas path 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 device that needs to detect the leak point) that needs to detect the leakage position (i.e., the leak point), and is used to input air into the inner cavity of the housing of the external device, so that the air pressure in the inner cavity of the housing of the external device becomes a positive air pressure;

[0034] The electrical control module is connected to the gas path control module, and is used to provide working power for the gas path control module, display the power supply state of the gas path control module, and control the opening or closing of the gas path control module;

[0035] Wherein, the external device is immersed in water (such as immersed in a water-filled container).

[0036] In the present invention, the device housing includes a hollow housing 11 and a box cover 6;

[0037] The top of the housing 11 is open and provided with a box cover 6;

[0038] The gas path control module includes an air inflation pump 7, a pressure switch 8, a hollow air pipe 2, a three-way joint 3, and a docking head 1;

[0039] The electrical control module includes a battery 9 and a lighted self-locking button 5;

[0040] The air inflation pump 7, the pressure switch 8, the hollow air pipe 2, and the three-way joint 3 in the gas path control module, and the battery 9 in the electrical control module are located in the inner cavity of the housing 11 of the device housing;

[0041] The top of the box cover 6 is provided with a lighted self-locking button 5.

[0042] In terms of specific implementation, for the device housing, the top of the housing 11 is fixedly connected to the box cover 6 by four screws 4;

[0043] In terms of specific implementation, as Figure 4a shown, four housing threaded holes 1101 are provided at the four corner positions at the top of the housing 11;

[0044] As Figure 5 shown, a stepped through hole 602 is vertically penetrated through each of the four corner positions of the box cover 6;

[0045] The four threaded holes 1101 and the four stepped through holes 602 are arranged in correspondence;

[0046] After the screw 4 passes through the stepped through hole 602 on the box cover 6, it is threadedly and fixedly connected to the housing threaded hole 1101 on the corresponding housing 11.

[0047] In terms of specific implementation, for the device housing, at the rear end of the box cover 6, a circular box cover through hole 601 is vertically penetrated;

[0048] A button with a lamp and self-locking 5 is provided on the box cover through hole 601.

[0049] In terms of specific implementation, the device housing further includes a grid 10;

[0050] The grid 10 is provided on the right side wall of the housing 11.

[0051] In terms of specific implementation, as Figure 4b shown, an annular protrusion 1001 is provided around the four peripheral edges of the grid 10;

[0052] The grid 10 is provided with a plurality of circular grid through holes 1002 penetrating in the inner direction of the annular protrusion 1001;

[0053] At the lower position of the rear end of the right side wall of the housing 11, a circular first housing through hole 1102 is provided;

[0054] The grid 10 is arranged in the first housing through hole 1102.

[0055] Furthermore, the first housing through hole 1102 of the housing 11 is in mating connection with the annular protrusion 1001 of the grid 10.

[0056] 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 in interference fit. The main function of the grid 10 is to realize the air circulation inside and outside the housing 11 during the operation of the air pump 7.

[0057] In terms of specific implementation, at the upper left position of the front side wall of the housing 11, a circular second housing through hole 1103 is provided;

[0058] The middle air pipe 2 in the air circuit control module penetrates through the second housing through-hole 1103;

[0059] It should be noted that the second housing through-hole 1103 of the housing 11 is used to extend the middle air pipe 2 outwards.

[0060] It should be noted that the middle air pipe 2 and the second housing through-hole 1103 of the housing 11 are in transitional fit (for example, it can be clearance fit or interference fit).

[0061] In terms of specific implementation, for the air circuit control module, the tee joint 3 is a T-shaped tee joint with three interfaces.

[0062] In terms of specific implementation, for the air circuit control module, the air outlet of the air inflation pump 7 is hermetically connected to the first interface on the tee joint 3;

[0063] The second interface on the tee joint 3 is hermetically connected to the air inlet on one side of the docking head 1 through a middle air pipe 2;

[0064] The third interface on the tee joint 3 is hermetically connected to the air pressure detection port on the pressure switch 8 through a hollow connecting pipe;

[0065] The docking head 1 is hermetically connected to the inner cavity interface on the housing of an external device (such as a sealed switch machine 12, or other sealed devices that need to detect leakage points) that needs to detect the leakage position (i.e., the leakage point);

[0066] The air outlet on the other side of the docking head 1 is communicated with the inner cavity of the housing of the external device through this inner cavity interface;

[0067] The air inflation 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 leakage points) through the tee joint 3, the middle air pipe 2 and the docking head 1, so that the air pressure in the inner cavity of the housing of the external device becomes a positive air pressure.

[0068] Furthermore, the external device is preferably a sealed switch machine.

[0069] In terms of specific implementation, for the air circuit control module, the pressure switch 8 is used to communicate with the inner cavity of the housing of an external device (such as a sealed switch machine) through the tee joint 3, the middle air pipe 2 and the docking head 1, and detect the pressure value (i.e., the positive pressure value) in the inner cavity of the housing of the external device (such as a sealed switch machine).

[0070] In terms of specific implementation, for the air circuit control module, see Figures 6a to 6c As shown, the docking head 1 includes a joint body 104 and a sealing ring 106;

[0071] The joint body 104 is hermetically connected to the inner cavity interface on the housing of an external device (such as a sealed switch machine) where leakage position (i.e., leakage point) detection is required.

[0072] Among them, an annular circular groove 1043 is provided on the circumferential cylindrical surface at one end of the joint body 104.

[0073] A sealing ring 106 is provided on the annular circular groove 1043 of the joint 104.

[0074] The annular circular groove 1043 is located inside the inner cavity interface of the external device (such as a sealed switch machine) housing, and an elastic sealing ring 106 is provided between them.

[0075] It should be noted that both sides of the elastic sealing ring 106 are in contact with (i.e., tightly abut against) the annular circular groove 1043 and the side of the inner cavity interface of the external device that faces it.

[0076] Furthermore, the sealing ring 106 is a Y-shaped sealing ring.

[0077] Furthermore, a threaded through hole 1041 of the joint body is provided through the axial center position of the joint body 104.

[0078] One end of the threaded through hole 1041 on the joint body 104 is threadedly and hermetically connected to the threaded part at one end of the threaded part of the hollow air pipe interface 101.

[0079] The other end of the air pipe interface 101 is hermetically connected to one end of the hollow air pipe 2.

[0080] Furthermore, for the joint 1, it also includes a disassembly and assembly handle 102, a nut 103, and an elastic washer 105.

[0081] A threaded blind hole 1042 of the joint body is provided on the end face at the other end of the joint body 104.

[0082] One end of the disassembly and assembly handle 102 has a connecting rod, and an external thread 1021 is provided on the outer side end of the connecting rod.

[0083] The external thread 1021 on the disassembly and assembly handle 102 is threadedly connected to the threaded blind hole 1042 on the joint body 104, and is fastened by the nut 103 and the elastic washer 105.

[0084] Among them, the nut 103 is threadedly connected to the external thread 1021 on the disassembly and assembly handle 102.

[0085] The elastic washer 105 is located between the nut 103 and the joint body 104.

[0086] Both sides of the elastic washer 105 are in contact with (i.e., tightly abut against) the nut 103 and the side of the joint body 104 that faces it.

[0087] It should be noted that the dismountable handle 102 is used to enable the staff to conveniently install and disassemble the connector 1 and the internal cavity interface on the housing of the external device (such as a sealed switch machine) that needs to detect the leakage position (i.e., the leakage point).

[0088] Specifically, as shown in Figure 3 For the electrical control module, the lighted self-locking button 5 includes a self-locking button S1 and an indicator light 1HL;

[0089] For the electrical control module, the positive terminal of the battery 9 is connected to the contact 13 of the self-locking button S1;

[0090] The contact 14 of the self-locking button S1 is respectively connected to the contact 05 of the indicator light 1HL and the contact 01 of the pressure switch 8;

[0091] The negative terminal of the battery 9 is respectively connected to the contact 06 of the indicator light 1HL and the positive power supply contact 04 of the air pump 7;

[0092] The contact 02 of the pressure switch 8 is connected to the negative power supply contact 04 of the air pump 7.

[0093] Furthermore, for the gas path control module, a pressure parameter value A is preset on the pressure switch 8;

[0094] When the pressure value (i.e., the positive pressure value) in the internal cavity of the housing of the external device (such as a sealed switch machine) detected by the pressure switch 8 reaches (e.g., equals or is greater than) the pressure parameter value A, the normally closed contact 01 and the normally closed contact 02 of the pressure switch 8 are disconnected.

[0095] It should be noted that the contacts 01 and 02 of the pressure switch 8 are normally closed contacts.

[0096] Furthermore, the pressure parameter value A of the pressure switch 8 is preferably 10 kPa.

[0097] It should be noted that as shown in Figure 7 When the staff presses the self-locking button S1 in the lighted self-locking button 5 by hand, the contact 05 of the indicator light 1HL of the lighted self-locking button 5 is connected to the positive terminal of the battery 9 through the self-locking button S1, and the contact 06 of the indicator light 1HL is connected to the negative terminal of the battery 9 through a wire. At this time, the indicator light 1HL lights up, indicating that the system is powered;

[0098] 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 normally closed contact 02 and the normally closed contact 01 of the pressure switch 8, the contacts 14 and 15 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. The air pump 7 starts to work and begins to fill the inner cavity of the 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 preset pressure parameter value A on the pressure switch 8, the normally closed contact 01 and the normally closed contact 02 of the pressure switch 8 are disconnected, thereby disconnecting the working circuit of the air pump 7, 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 the water is the leakage point of the external device (such as a sealed switch machine).

[0099] 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 equal to 10 kPa. Therefore, the pressure parameter value A of the pressure switch 8 can be correspondingly set to 10 kPa.

[0100] To understand the present invention more clearly, the technical principle and working mechanism of the lighted self-locking button 5 will be explained below.

[0101] In the present invention, specifically, the lighted self-locking button 5 is a mature conventional electrical device in the prior art. For example, a lighted self-locking button with the model XB2BW33B1C produced by Schneider Electric SA 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.

[0102] Among them, the lighted self-locking button 5 is composed of a self-locking button S1 and an indicator light 1HL, and includes four contacts, namely the contacts 13 and 14 of the self-locking button S1 and the contacts 05 and 06 of the indicator light 1HL.

[0103] It should be noted that the contacts 13 and 14 of the self-locking button S1 are normally open contacts;

[0104] The working principle of the self-locking button S1 is: after the staff presses and releases the button, the button is held by its own locking mechanism, and the contacts 13 and 14 of the self-locking button S1 can be closed. At this time, in the present invention, the self-locking button S1 is used to connect the working power of the leakage detection device of the present invention; after being pressed and released again, the self-locking button S1 will disconnect the button's own locking mechanism, and disconnect the contacts 13 and 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 leakage detection device of the present invention.

[0105] In order to more clearly understand the present invention, the technical principle and working mechanism of the pressure switch 8 are explained below.

[0106] In the present invention, in specific implementation, the pressure switch 8 is a conventional electrical device with mature prior art. For example, a pressure switch of model QPM11-NC-01 produced by Noke 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 a preset pressure parameter value A, so that the air pump 7 stops working.

[0107] Among them, contact 01 and contact 02 of pressure switch 8 are normally closed contacts. The working principle of pressure switch 8 is: when the pressure detected by it in the inner cavity of the switch machine housing increases, the diaphragm inside the pressure switch is deformed. When the pressure reaches the set value (that is, the pre-set pressure parameter value A), the diaphragm inside the pressure switch drives contact 01 and contact 02 through the pull rod inside the pressure switch, so that contact 01 and contact 02 are disconnected.

[0108] It should be noted that the set pressure parameter value A of the pressure switch 8 is: the set value reached by inflating the inner cavity pressure of the shell of the external device (such as a sealed switch machine) through the air pump 7. The function of this value is: when the inner cavity pressure of the shell of the external device (such as a sealed switch machine) is inflated to the set value, the diaphragm inside the pressure switch 8 is deformed, thereby disconnecting the contacts 01 and 02 of the pressure switch 8.

[0109] See also Figure 8 As shown, when the pressure in the inner cavity of the switch machine housing reaches the pressure parameter value A preset on the pressure switch 8, the contacts 01 and 02 of the pressure switch 8 are disconnected, thereby disconnecting the working circuit of the air pump 7, causing the air pump 7 to stop working, that is, no longer filling gas into the inner cavity of the housing of the external device (such as a sealed type switch machine).

[0110] Based on the leakage point detection device provided by the present invention, the present invention further provides a switch machine, which includes the leakage point detection device as described above.

[0111] In specific implementation, the switch machine is a sealed switch machine 12, and the inner cavity interface on the shell is sealedly connected to the docking head 1 in the air circuit control module.

[0112] In summary, compared with the prior art, the present invention provides a leak point detection device and a switch machine, with a scientific structural design, capable of efficiently and reliably detecting the leakage parts of external devices such as switch machines (specifically, sealed switch machines), significantly improving the daily detection and maintenance efficiency of switch machines, and having great practical significance.

[0113] After inspection, for the present invention, by using an air inflation pump to fill the inner cavity of the switch machine with gas to form a positive pressure in the inner cavity of the switch machine, precisely controlling the positive pressure value of the gas filled into the inner cavity of the switch machine through a pressure switch, and by checking the bubbling parts of the switch machine in water, the leakage parts of the switch machine can be quickly detected, and the detection method is efficient and convenient.

[0114] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A leak point detection device, characterized in that, It includes a device housing, a gas path control module, and an electrical control module; The gas path control module and the electrical control module are provided on the device housing; The gas path control module is connected to the inner cavity of the housing of an external device that needs to detect the leakage position, and is used to input air into the inner cavity of the housing of the external device, so that the air pressure in the inner cavity of the housing of the external device becomes a positive air pressure; The electrical control module is connected to the gas path control module, and is used to provide working power for the gas path control module, display the power supply status of the gas path control module, and control the opening or closing of the gas path control module; Among them, the external device is immersed in water.

2. The leak point detection device according to claim 1, characterized in that, The device housing includes a hollow housing (11) and a box cover (6); The top of the housing (11) is open and provided with a box cover (6); The gas path control module includes an air inflation pump (7), a pressure switch (8), a middle air pipe (2), a three-way joint (3), and a docking head (1); The electrical control module includes a battery (9) and a lighted self-locking button (5); The air inflation pump (7), the pressure switch (8), the middle air pipe (2), and the three-way joint (3) in the gas path control module, and the battery (9) in the electrical control module are located in the inner cavity of the housing (11) of the device housing; The lighted self-locking button (5) is provided on the top of the box cover (6).

3. The leak point detection device according to claim 2, wherein For the device housing, the top of the housing (11) and the box cover (6) are fixedly connected by four screws (4); Four housing threaded holes (1101) are provided at the four corner positions of the top of the housing (11); A stepped through hole (602) is vertically penetrated through each of the four corner positions of the box cover (6); The four threaded holes (1101) and the four stepped through holes (602) are arranged corresponding to each other; After the screw (4) passes through the stepped through hole (602) on the box cover (6), it is threadedly and fixedly connected to the housing threaded hole (1101) on the corresponding housing (11); and / or For the device housing, at the rear end of the box cover (6), a circular box cover through hole (601) is vertically penetrated; The lighted self-locking button (5) is provided on the box cover through hole (601).

4. The leak point detection device according to claim 2, wherein At the upper left position of the front side wall of the housing (11), a circular second housing through hole (1103) is provided; The middle air pipe (2) in the gas path control module passes through the second housing through hole (1103).

5. The leak point detection device according to claim 2, wherein For the gas path control module, the air outlet of the air inflation pump (7) is hermetically connected to the first interface on the three-way joint (3); The second interface on the three-way joint (3) is hermetically connected to the air inlet on one side of the docking head (1) through a middle air pipe (2); The third interface on the three-way joint (3) is hermetically connected to the air pressure detection port on the pressure switch (8) through a hollow connecting pipe; The docking head (1) is hermetically connected to the inner cavity interface on the housing of the external device; The air inflation pump (7) is used to input air into the inner cavity of the housing of the external device through the three-way joint (3), the middle air pipe (2), and the docking head (1), so that the air pressure in the inner cavity of the housing of the external device becomes a positive air pressure.

6. The leak point detection device according to claim 2, wherein, The docking head (1) includes a joint body (104) and a sealing ring (106); The joint body (104) is hermetically connected to the inner cavity interface on the housing of the external device; Among them, an annular circular groove (1043) is provided on the circumferential cylindrical surface at one end of the joint body (104); A sealing ring (106) is provided on the annular circular groove (1043) of the joint (104); The annular circular groove (1043) is located inside the inner cavity interface of the external device housing, and an elastic sealing ring (106) is provided between the two.

7. The leak point detection device according to claim 6, characterized in that, A threaded through hole (1041) of the joint body is provided through the axial center position of the joint body (104); One end of the threaded through hole (1041) on the joint body (104) is threadedly and hermetically connected to the threaded part at one end of the hollow air pipe interface (101); The other end of the air pipe interface (101) is hermetically connected to one end of the hollow air pipe (2); and / or, For the docking joint (1), it further includes a disassembly and assembly handle (102), a nut (103) and an elastic washer (105); A threaded blind hole (1042) of the joint body is provided on the end face at the other end of the joint body (104); One end of the disassembly and assembly handle (102) has a connecting rod, and an external thread (1021) is provided on the outer side end of the connecting rod; The external thread (1021) on the disassembly and assembly handle (102) is threadedly connected to the threaded blind hole (1042) on the joint body (104), and is fastened by a nut (103) and an elastic washer (105); Among them, the nut (103) is threadedly connected to the external thread (1021) on the disassembly and assembly handle (102); The elastic washer (105) is located between the nut (103) and the joint body (104); Both sides of the elastic washer (105) are abutted against the opposite sides of the nut (103) and the joint body (104) respectively.

8. The leak point detection device according to claim 2, 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 contact 13 of the self-locking button S1; The contact 14 of the self-locking button S1 is respectively connected to the contact 05 of the indicator light 1HL and the contact 01 of the pressure switch (8); The negative terminal of the battery (9) is respectively connected to the contact 06 of the indicator light 1HL and the positive power supply contact 04 of the air pump (7); The contact 02 of the pressure switch (8) is connected to the negative power supply contact 04 of the air pump (7). and / or, For the gas circuit control module, a pressure parameter value A is preset on the pressure switch (8); When the pressure value inside the inner cavity of the external device housing detected by the pressure switch (8) reaches the pressure parameter value A, the normally closed contact 01 and the normally closed contact 02 of the pressure switch (8) are disconnected.

9. A switch machine, characterized in that, It includes a leak point detection device according to any one of claims 1 to 8.

10. The switch machine according to claim 9, characterized in that, The switch machine is a sealed switch machine, and the inner cavity interface on its housing is hermetically connected to the docking joint (1) in the gas circuit control module.

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