Anti-creeping detection device for high-low voltage complete switch cabinet

Abstract

The invention relates to the technical field of detection devices, in particular to an anti-creeping detection device for a high-low voltage whole-set switch cabinet, a detection electroprobe is further arranged on the outer side of a cabinet body so as to provide an auxiliary creeping detection effect for the switch cabinet, and the nib of the detection electroprobe provides a protection effect through an arranged detection protection assembly; according to the scheme, an electric leakage detection auxiliary effect is provided for the inner cavity of the cabinet body, the cabinet body and the cabinet door through the detection electroprobe; on the basis of providing electric leakage detection for the cabinet body through the detection electroprobe, the scheme also provides protection for the nib of the detection electroprobe through the arranged detection protection assembly so as to ensure the sensitivity of the detection work; after the rubber installation clamping ring is clamped into the plugging clamping groove, positioning of the detection electroprobe can be completed, a pen point arranged at the front end of the detection electroprobe can penetrate through a penetrating cavity in the bearing disc body, and in the process, on one hand, the pen point of the detection electroprobe is protected so that the pen point can be prevented from being exposed to the outer side for a long time.

Description

Technical Field

[0001] This invention relates to the field of detection device technology, and in particular to a leakage current detection device for high and low voltage switchgear. Background Technology

[0002] A document with publication number CN112886416A discloses a remotely monitored automatic leakage current warning switchgear. The specification states that "when using this remotely monitored automatic leakage current warning switchgear, firstly, the switchgear body is connected via a bus connector and an input connector. When leakage occurs within the switchgear body, the current drives the heating plate through the detection wire, causing the heating plate temperature to rise. The rising temperature of the heating plate then heats the magnet through a heat-conducting plate, weakening the magnet's magnetic force and reducing its attraction to the magnetic block. The third reset spring pushes the movable rod upwards through the baffle, causing the top plate to move upwards and pushing the limit block out of the limit groove, thus disconnecting the limit block from the limit groove. At this time, the bus connector is pushed to the right by the first reset spring, and the guide block slides along the guide groove, disconnecting the bus connector from the input connector and breaking the circuit within the switchgear body."

[0003] In the above-mentioned scheme, when performing leakage current detection on high and low voltage switchgear, a corresponding leakage current detection module is installed inside the switchgear for detection. In actual use, if the leakage current detection module malfunctions, it may misjudge whether there is a leakage. Therefore, it is generally necessary for staff to open the switchgear regularly for inspection. This procedure lacks a suitable leakage current detection auxiliary mechanism to help staff judge whether there is a leakage. Blindly opening the switchgear for inspection and maintenance may cause electric shock hazards.

[0004] After further searching, document CN218850151U discloses a leakage-proof high and low voltage switchgear. The solution discloses that "when it is necessary to open the door panel of the high and low voltage switchgear to inspect the inside of the switchgear, a test pen on the elastic rope installed on the door panel is used to test the door panel and the outer wall of the high and low voltage switchgear to see if there is any leakage. If there is no leakage, the door panel can be opened to carry out maintenance work, which brings great convenience to the staff and avoids electric shock."

[0005] This solution uses a test pen to detect the outside of the cabinet and determines whether there is a leakage by checking if the cabinet is energized. However, the test pen used to assist in detecting leakage lacks the ability to detect the inside of the cabinet, and the test pen tip is exposed on the outside without a protective structure. If the test pen tip is contaminated, it will affect the detection work.

[0006] Therefore, this invention proposes a leakage current detection device for high and low voltage switchgear to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a leakage current detection device for high and low voltage switchgear to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a leakage current detection device for high and low voltage switchgear, comprising a first detection conductive strip equidistantly arranged on the inner wall of the cabinet and a second detection conductive strip arranged on the inner side of the cabinet door; The second detection transmission strip is horizontally installed on the inside of the cabinet door, and adjacent second detection transmission strips are connected by connecting transmission strips; A testing pen is also installed on the outside of the cabinet; A detection and protection component is also installed on the outside of the cabinet door.

[0009] Preferably, an elastic connecting rope is provided on the side of the tail end of the test pen, and the other end of the elastic connecting rope is connected to the suspension assembly. The suspension assembly includes a rubber chuck connected to the other end of an elastic connecting rope, which is adapted to and plugs into a positioning collar fixed to the outside of the cabinet door. Handles are symmetrically fixed on the rubber chuck to facilitate separation of the rubber chuck from the positioning collar.

[0010] Preferably, a detection through hole is also provided in the cabinet door, which is aligned with one of the second detection transmission strips on the inner side of the cabinet door; A detection protection component is installed at the outer opening of the detection through hole.

[0011] Preferably, the detection protection component includes a rubber mounting ring that is fixedly disposed on the outer wall of the detection pen; The detection and protection assembly also includes a support plate, on which a mounting base is fixedly installed at the bottom edge. The mounting base is fixed to the side wall of the cabinet door by screws.

[0012] Preferably, a through cavity is provided at the center of the end of the bearing disk, the opening of the through cavity is circular, and the axes of the through cavity and the detection through hole are on the same straight line; A sealing groove is provided at one end of the cavity through which the test pen is inserted. The sealing groove engages with the rubber mounting ring on the outer wall of the test pen to provide installation positioning for the test pen.

[0013] Preferably, the detection and protection component further includes an auxiliary structure; The auxiliary structure includes a protective tube body, which is composed of two loading half-tubes joined together. The protective tube body is adapted to be inserted into the through cavity in the carrier plate.

[0014] Preferably, a support arc plate is fixedly provided on the outer wall of the front end of the loading half-pipe; After the two loading half-pipes are spliced ​​together, the support arc plates set at their front ends are joined together to form a support ring; The support ring is secured in the sealing groove and fixed with screws.

[0015] Preferably, cleaning brush bristles are provided on the inner sidewalls of both loading half-pipes; The cleaning brush bristles on the inside of one half-tube are staggered with those on the inside of the other half-tube, forming a cleaning brush net. This cleaning brush is used to clean the tip of the test pen to ensure its detection sensitivity.

[0016] Preferably, arc-shaped baffles are fixedly installed on the inner sidewalls of the tail ends of both loading half-pipes; Two curved baffles meet to form a limiting baffle ring, which provides a blocking effect against the cleaned-out impurities to prevent them from entering the inner cavity of the cabinet.

[0017] Preferably, a receiving groove is also provided on the supporting arc plate, and the receiving groove is arc-shaped; After the supporting arc plate is connected, the receiving groove on it is connected to form an annular cavity. A drying cotton strip is also provided in the receiving groove. The drying cotton strip is used to improve the sealing performance of the rubber mounting ring and the sealing groove and to prevent external moisture from entering the through cavity.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The high and low voltage switchgear leakage detection device designed in this invention includes a first detection conductive strip equally spaced on the inner wall of the cabinet and a second detection conductive strip disposed on the inner side of the cabinet door; wherein the second detection conductive strip is arranged horizontally on the inner side of the cabinet door, and adjacent second detection conductive strips are connected by connecting conductive strips; a detection pen is also disposed on the outer side of the cabinet to provide a leakage auxiliary detection function for the switchgear, and the tip of the detection pen is protected by a detection protection component; This solution uses a test pen to assist in detecting leakage current in the cabinet's internal cavity, as well as the cabinet itself and its doors. In addition to using the test pen to detect whether there is leakage current in the cabinet, this solution also uses a detection protection component to protect the tip of the test pen, thereby ensuring the sensitivity of its detection work. Once the rubber mounting ring is inserted into the sealing slot, the positioning of the test pen is completed. At the same time, the pen tip at the front end of the test pen will pass through the through cavity in the carrier plate. This process provides protection for the pen tip to prevent it from being exposed to the outside for a long time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram on the right side showing the structural connection between the switch cabinet and the leakage current detection device of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structural connection at point A; Figure 3 This is a schematic diagram of the connection between the switch cabinet and the leakage current detection device of the present invention on the left side; Figure 4 for Figure 3 Enlarged schematic diagram of the structural connection at point B; Figure 5 This is an exploded view of the connection between the detection pen, the suspension assembly, and the detection protection assembly of the present invention. Figure 6 This is a schematic diagram of the connection between the detection and protection component structure of the present invention and the front side before the explosion. Figure 7 for Figure 6 Enlarged schematic diagram of the structural connection at point C; Figure 8 This is a schematic diagram of the structure of the protective component of the present invention connected to the explosion tail side; Figure 9 for Figure 8 Enlarged schematic diagram of the structural connection at point D; Figure 10 This is an exploded view of the connection between the drying cotton column and the mounting base structure of the present invention; Figure 11 This is a schematic diagram of the front side of the connection between the drying cotton column and the extension card end structure of the present invention; Figure 12 This is a schematic diagram of the connection between the drying cotton column and the extension card end structure of the present invention. Figure 13 This is a schematic diagram of the internal structure of the drying cotton column of the present invention.

[0020] In the diagram: Cabinet 1, Cabinet door 2, Detection through hole 21, First detection transmission strip 3, Second detection transmission strip 4, Arc-shaped slope 41, Connecting transmission strip 42, Detection pen 5, Elastic connecting rope 51, Rubber chuck 601, Handle 602, Positioning collar 603, Rubber mounting collar 701, Bearing plate 702, Mounting base 703, Through cavity 704, Sealing slot 705, Loading half-pipe 801, Support arc plate 802, Cleaning brush 803, Arc-shaped baffle 804, Receiving groove 805, Drying cotton strip 806, Drying cotton column 901, Extension end 902, Receiving cavity 903, Cleaning through cavity 904, Annular retention groove 1001, Mounting slot 1002, Mounting block 1003, Cleaning scraper 1004. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-9 A leakage current detection device for high and low voltage switchgear includes a first detection conductive strip 3 equidistantly arranged on the inner side wall of the cabinet 1 and a second detection conductive strip 4 arranged on the inner side of the cabinet door 2; wherein the second detection conductive strip 4 is arranged horizontally on the inner side of the cabinet door 2, and adjacent second detection conductive strips 4 are connected by connecting conductive strips 42. A detection pen 5 is also installed on the outside of the cabinet 1 to provide a leakage current auxiliary detection function for the switch cabinet. The tip of the detection pen 5 is protected by the detection protection component.

[0023] According to the appendix Figure 1-4 As shown, this solution uses a test pen 5 to provide an auxiliary function for leakage current detection of the inner cavity of cabinet 1, as well as cabinet 1 and cabinet door 2.

[0024] To use the test pen 5, the tip of the test pen 5 is brought into contact with the object being tested, while the thumb is in contact with the metal head at the end of the test pen 5. If the object being tested has current, the current passes through the tip of the pen, then through the neon bulb in the test pen 5, and finally is conducted to the human body through the metal head at the end of the test pen 5. The human body forms a circuit with the ground, and the neon bulb in the test pen 5 will light up. If the object being tested does not have current, the neon bulb in the test pen 5 will not light up.

[0025] In addition to using the test pen 5 to detect whether the cabinet 1 is leaking current, this solution also uses a detection protection component to protect the tip of the test pen 5 to ensure the sensitivity of its detection work.

[0026] Combined with appendix Figure 4-7 As shown, an elastic connecting rope 51 is connected to the side of the tail end of the test pen 5, and the other end of the elastic connecting rope 51 is connected to the suspension assembly. The suspension assembly includes a rubber chuck 601 connected to the other end of the elastic connecting rope 51. The rubber chuck 601 is adapted to be inserted into the positioning collar 603 fixed on the outside of the cabinet door 2. A handle 602 is also symmetrically fixed on the rubber chuck 601 to facilitate the separation of the rubber chuck 601 from the positioning collar 603.

[0027] An elastic connecting rope 51 is provided on one side of the tail end of the test pen 5, and the other end of the elastic connecting rope 51 is connected to the suspension assembly. The elastic connecting rope 51 provides convenience for the use of the test pen 5. When the cabinet door 2 needs to be opened, the test pen 5 can provide a test for the cabinet door 2 and the outside of the cabinet body 1.

[0028] From the appendix Figure 5-6 As shown, the positioning of the test pen 5 is achieved by the engagement of the rubber mounting ring 701 on the outside of the test pen 5 with the sealing groove 705 on the carrier plate 702.

[0029] The cabinet door 2 is equipped with a detection through hole 21, which is aligned with one of the second detection conduction strips 4 on the inner side of the cabinet door 2. A detection protection component is provided at the outer opening of the detection through hole 21. That is, after the rubber mounting ring 701 is inserted into the sealing groove 705, the positioning of the detection pen 5 is completed. At the same time, the pen tip at the front end of the detection pen 5 will pass through the through cavity 704 in the support plate 702 and will contact the second detection conduction strip 4. In this process, the pen tip of the detection pen 5 is protected to prevent it from being exposed to the outside for a long time.

[0030] On the other hand, combined with the appendix Figure 2 As shown, the second detection transmission strip 4 located on the inner side of the cabinet door 2 is aligned with the first detection transmission strip 3 located on the inner side wall of the cabinet body 1. An arc-shaped slope 41 is provided at the end of the second detection transmission strip 4 near the first detection transmission strip 3. The function of the arc-shaped slope 41 is that when the cabinet door 2 is closed, the second detection transmission strip 4 will contact the first detection transmission strip 3, and the arc-shaped slope 41 will not cause the second detection transmission strip 4 to get stuck when it contacts the first detection transmission strip 3.

[0031] The detection protection assembly also includes a support plate 702, on which a mounting base 703 is fixedly installed at the bottom edge. The mounting base 703 is fixed to the side wall of the cabinet door 2 by screws. A through cavity 704 is provided through the center of the end of the support plate 702. The opening of the through cavity 704 is circular, and the axes of the through cavity 704 and the detection through hole 21 are on the same straight line. A sealing groove 705 is provided at one end of the through cavity 704. The sealing groove 705 is engaged with the rubber mounting ring 701 on the outer side wall of the detection pen 5.

[0032] The tip of the test pen 5 is disconnected from the second detection conduction strip 4. This means that while protecting the test pen 5, it can also provide a leakage detection auxiliary function for the inside of the cabinet 1. When a leakage problem occurs inside the cabinet 1, the current is conducted through the first detection conduction strip 3 to the second detection conduction strip 4, and then to the test pen.

[0033] When it is necessary to open cabinet door 2 to inspect and maintain cabinet body 1, the first step is to manually determine whether there is a leakage problem inside cabinet body 1. First, touch the metal tip of the test pen 5 with your hand and check whether the neon bulb in the test pen 5 lights up to determine if there is a leakage problem. If there is a leakage problem, the power needs to be cut off before maintenance work can be carried out. If no leakage is detected, in order to improve the accuracy of the test, it is necessary to perform another test on the outside of cabinet door 2 and cabinet body 1 to further improve the safety of operation. That is, at this time, pull the test pen 5 outward until the rubber mounting ring 701 on the outside of the test pen 5 is separated from the sealing groove 705. Then, hold the test pen 5 to test the outer wall of cabinet door 2. After confirming that there is no current, the cabinet door 2 can be opened.

[0034] After opening, if it is necessary to test the various working components inside the cabinet 1, the test pen 5 can be removed. That is, the rubber chuck 601 connected to one end of the elastic connecting rope 51 can be removed from the positioning collar 603. Pull the handle 602 by hand until the rubber chuck 601 is separated from the positioning collar 603. Then use the test pen 5 to test the leakage current of the various working components inside the cabinet 1.

[0035] Combined with the appendix Figure 6-9 As shown, the detection and protection component also includes an auxiliary structure. This auxiliary structure includes a protective tube body, which is formed by splicing two loading half-tubes 801. The protective tube body is adapted to be inserted into the through cavity 704 in the bearing plate 702. A support arc plate 802 is fixedly installed on the outer wall of the front end of the loading half-tube 801. After the two loading half-tubes 801 are spliced, the support arc plate 802 at its front end is joined to form a support ring. The support ring is locked in the sealing slot 705 and fixed by screws. Cleaning bristles 803 are provided on the inner wall of both loading half-tubes 801. The cleaning bristles 803 on the inner side of one loading half-tube 801 are staggered with the cleaning bristles 803 on the inner side of the other loading half-tube 801, forming a cleaning brush net.

[0036] When the test pen 5 is inserted into the carrier plate 702 for positioning, the tip of the test pen 5 passes through the cleaning brush in the protective tube. The cleaning brush can clean the test pen tip of the test pen 5, that is, prevent excessive impurities from adhering to the pen tip. Impurities that adhere to the pen tip when it comes into contact with the object being tested or are exposed to the outside world during use can be cleaned when passing through the cleaning brush, so as to ensure the sensitivity of the test pen 5.

[0037] From the appendix Figure 7 and attached Figure 9 As shown, this solution also includes a receiving groove 805 on the supporting arc plate 802, which is arc-shaped. After the supporting arc plate 802 is connected, the receiving groove 805 on it connects to form an annular cavity. A drying cotton strip 806 is also provided in the receiving groove 805. The drying cotton strip 806 is used to improve the sealing performance of the rubber mounting ring 701 and the sealing groove 705 and to prevent external moisture from entering the through cavity 704.

[0038] Then from the appendix Figure 7-8 As shown, arc-shaped baffles 804 are fixedly installed on the inner sidewalls of the tail ends of the two loading half-pipes 801; the two arc-shaped baffles 804 are joined together to form a limiting baffle ring, which provides a blocking effect for the cleaned-up impurities to prevent them from entering the inner cavity of the cabinet 1.

[0039] In other words, when the tip of the test pen 5 passes through the cleaning brush in the protective tube, the impurities on the tip are cleaned by the cleaning brush. Some impurities will adhere to the cleaning brush, and some impurities will fall onto the inner wall of the protective tube. The limit ring provides a blocking effect for the falling impurities. After a certain period of use, when it is necessary to clean the impurities collected in the protective tube and the impurities on the cleaning brush, the protective tube can be directly removed from the through cavity 704 in the carrier plate 702.

[0040] First, release the fixing of the front end support arc plate 802 of the loading half tube 801, that is, release the screw fixing the support arc plate 802. Then, take the loading half tube 801 out of the through cavity 704. After taking it out, clean the impurities in the loading half tube 801 and on the corresponding cleaning brush bristles 803.

[0041] Example 2: Based on Example 1, please refer to the appendix. Figure 10 - Appendix Figure 13 In cases of severe external humidity, this solution improves the drying and sealing effect by installing drying cotton columns 901, thereby preventing external moisture from entering the cabinet 1.

[0042] An extension clip 902 is provided at the front end of the drying cotton column 901. The drying cotton column 901 is placed in the through cavity 704 in the support plate 702. The extension clip 902 is clipped in the sealing slot 705 and fixed by screws.

[0043] A cleaning cavity 904 is provided in the drying cotton column 901, and a receiving cavity 903 is provided in the extension card end 902. The receiving cavity 903 is connected to the cleaning cavity 904. The cleaning cavity 904 can also provide a cleaning function for the pen tip of the test pen 5. The receiving cavity 903 is used to hold the pen body of the test pen 5.

[0044] During the process of inserting the pen tip of the test pen 5 into the cleaning cavity 904, in order to further improve the cleaning effect on the impurities adhering to the pen tip, this solution also provides an annular retention groove 1001 on the inner side wall of the cleaning cavity 904 and an installation slot 1002 equally spaced in the annular retention groove 1001. The installation slot 1002 engages with the installation block 1003 at the bottom of the cleaning scraper 1004. In order to further improve the installation stability of the cleaning scraper 1004, that is, to improve the engagement strength between the installation block 1003 and the installation slot 1002, glue can be applied to the installation block 1003 before it is engaged in the installation slot 1002 to improve the installation strength of the installation block 1003.

[0045] When the tip of the test pen 5 enters the cleaning cavity 904 of the drying cotton column 901, the cleaning scraper 1004 provides a scraping function to remove the impurities adhering to the tip. The scraped impurities will temporarily remain in the annular retention groove 1001, which serves as a temporary storage function. When cleaning later, the drying cotton column 901 is removed, and the impurities in the annular retention groove 1001 are then cleaned in a concentrated manner.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-low voltage complete switch cabinet anti-creeping detection device, characterized in that: The first detection conducting strip (3) is arranged equidistantly on the inner side wall of the cabinet body (1), and the second detection conducting strip (4) is arranged on the inner side of the cabinet door (2); The second detection conducting strip (4) is arranged transversely on the inner side of the cabinet door (2), and the adjacent second detection conducting strips (4) are connected through the connecting conducting strip (42); The detection electric pen (5) is further arranged on the outer side of the cabinet body (1); The detection protection assembly is further arranged on the outer side of the cabinet door (2).

2. The leakage protection detection device for high-low voltage switch cabinet according to claim 1, characterized in that: The elastic connecting rope (51) is connected to the tail end of the detection electric pen (5), and the other end of the elastic connecting rope (51) is connected to the hanging assembly; The hanging assembly comprises a rubber chuck (601) connected to the other end of the elastic connecting rope (51), and the rubber chuck (601) is matched and inserted with the positioning sleeve ring (603) fixed on the outer side of the cabinet door (2); A handle (602) is symmetrically fixed on the rubber chuck (601), so that the rubber chuck (601) can be separated from the positioning sleeve ring (603).

3. The leakage protection detection device for high-low voltage switch cabinet according to claim 1, characterized in that: A detection through hole (21) is further arranged in the cabinet door (2), and the detection through hole (21) is aligned with one of the second detection conducting strips (4) on the inner side of the cabinet door (2); A detection protection assembly is arranged at the outer hole position of the detection through hole (21).

4. The leakage protection detection device for high-low voltage switch cabinet according to claim 3, characterized in that: The detection protection assembly comprises a rubber mounting snap ring (701) fixed on the outer side wall of the detection electric pen (5); The detection protection assembly further comprises a bearing disc body (702), and a mounting seat (703) is fixed on the bottom end of the bearing disc body (702), and the mounting seat (703) is fixed on the side wall of the cabinet door (2) through screws.

5. The leakage protection detection device for high-low voltage switch cabinet according to claim 4, characterized in that: A through cavity (704) is arranged at the center of the end of the bearing disc body (702), the cavity opening of the through cavity (704) is circular, and the axis of the through cavity (704) and the detection through hole (21) are on the same straight line; A blocking slot (705) is arranged at one end of the through cavity (704), and the blocking slot (705) is connected with the rubber mounting snap ring (701) on the outer side wall of the detection electric pen (5) to provide mounting and positioning for the detection electric pen (5).

6. The leakage protection detection device for high-low voltage switch cabinet according to claim 5, characterized in that: The detection protection assembly further comprises an auxiliary structure; The auxiliary structure comprises a protection pipe body, which is formed by splicing two loading half-pipes (801), and the protection pipe body is matched and inserted with the through cavity (704) in the bearing disc body (702).

7. The leakage protection detection device for high-low voltage switch cabinet according to claim 6, characterized in that: A support arc plate (802) is fixed on the outer side wall of the front end of the loading half-pipe (801); After the two loading half-pipes (801) are spliced, the support arc plates (802) arranged at the front ends of the two loading half-pipes (801) are connected to form a support ring. The support ring is clamped in the blocking slot (705) and is fixed by screws.

8. The leakage protection detection device for high-low voltage switch cabinet according to claim 6, characterized in that: Cleaning bristles (803) are arranged on the inner side walls of the two loading half-pipes (801); The cleaning bristles (803) on the inner side of one of the loading half-pipes (801) are arranged staggered with the cleaning bristles (803) on the inner side of the other loading half-pipe (801), and the two form a cleaning brush net.

9. The leakage protection detection device for high-low voltage switch cabinet according to claim 8, characterized in that: The arc-shaped blocking strips (804) are fixedly arranged on the inner side walls of the tail ends of the two loading half-pipes (801); The two arc-shaped blocking strips (804) are abutted to form a limiting blocking ring.

10. The leakage protection detection device for high-low voltage switch cabinet according to claim 7, characterized in that: The supporting arc-shaped plate (802) is further provided with a containing groove (805), which is arranged in an arc shape; After the abutment of the supporting arc-shaped plate (802), the containing grooves (805) on the supporting arc-shaped plate (802) are abutted to form an annular cavity groove, and the drying cotton (806) is further arranged in the containing groove (805), which is used for improving the sealing performance of the rubber mounting snap ring (701) and the blocking snap groove (705) and avoiding the entry of external moisture into the through cavity (704).

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