A cable joint and connector block

Abstract

The application provides a cable joint and a connecting seat. The cable joint comprises a joint body, a metal shell and a conductive assembly. The joint body has a through hole. The conductive assembly is arranged in the middle of the through hole. The joint body has a first end and a second end. The first end is used for the cable to pass into the through hole and contact the conductive assembly. The second end is used for plugging with the connecting seat. The conductive assembly is used for conducting the cable and the connecting seat. The metal shell is in a cylindrical shape and is sleeved on the outer periphery of the joint body and extends to the first end. The metal shell has high structural strength and can produce elastic deformation. After the cable bears external force, the metal shell can bear large stress, reduce the deformation of the joint body, and further reduce the damage of the rubber due to serious deformation, thereby reducing the risk of electric leakage of the cable joint.

Description

Technical Field

[0001] The embodiments of this application relate to the field of connector technology, and more specifically, to a cable connector and connector base. Background Technology

[0002] Cable joints are critical components for connecting cables to each other and to electrical equipment. They play a vital role in ensuring the stability, sealing, and safety of circuit connections, especially in medium- and high-voltage applications. During use, one end of the cable is located inside the cable joint, which tightly wraps around the cable and connects it to other cables or electrical equipment via plugging, threading, or other methods.

[0003] Most existing medium-voltage cable joints are made of silicone rubber or ethylene propylene rubber. Cables are often subjected to tension during use, and prolonged use can cause severe deformation of the cable joints, affecting their insulation performance and potentially leading to creepage, breakdown, or excessive partial discharge near the cable joints.

[0004] Therefore, how to reduce the risk of leakage current in cable joints is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To overcome the above-mentioned deficiencies, embodiments of this application provide a cable connector with a lower risk of leakage, thereby improving the safety of cable connections. This application also provides a connector including the aforementioned cable connector.

[0006] According to one aspect, at least one embodiment of this application provides a cable connector, including a connector body, a metal housing, and conductive components, wherein... The connector body has a through hole, and the conductive component is located in the middle of the through hole. The connector body also has a first end and a second end. The first end is used for the cable to pass through the through hole and contact the conductive component, and the second end is used for insertion into the connector base. Conductive components are used to connect the cable to the connector; The metal shell is cylindrical and is fitted around the outer periphery of the connector body, extending to the first end where the metal shell is cylindrical.

[0007] In some embodiments, the connector body includes an insulating layer and a first shielding layer. The first shielding layer has a first covering section and a second covering section distributed along the axial direction. The insulating layer is separated from the first end by a first preset distance. The first covering section covers the outer periphery of the insulating layer, and the second covering section is located between the insulating layer and the first end.

[0008] In some embodiments, a sealing assembly is also included, disposed around the first end and the cable, for sealing between the connector body and the cable.

[0009] In some embodiments, the sealing assembly includes a sleeve, a portion of which is fitted over the outside of the first end, and the remainder is fitted over the outer periphery of the cable.

[0010] In some embodiments, a receiving space is formed between the sleeve and the connector body to accommodate the cable, and the sealing assembly further includes a sealant disposed in the receiving space.

[0011] In some embodiments, the connector body further includes a second shielding layer, the conductive component includes a terminal block, the second shielding layer is located in the middle of the connector body in the axial direction, the second shielding element is disposed around the terminal block for shielding the electric field between the terminal block and the cable, and the insulating layer can be used for insulation between the first shielding layer and the second shielding layer.

[0012] In some embodiments, the distance between the second shielding layer and the second covering segment is greater than a preset value.

[0013] This application also provides a connector, including a metal housing and a socket for mating with a cable connector in any of the above embodiments, wherein the metal housing is electrically connected to the cable connector when the cable connector is inserted into the socket, and the metal housing is grounded.

[0014] In some embodiments, the device further includes an insulating portion and a conductive core, wherein the conductive core is disposed inside the insulating portion and the outer surface of the insulating portion away from the conductive core has a conductive coating.

[0015] In some embodiments, the device further includes a conductive rubber ring, the inner wall of the metal housing has a positioning groove extending axially, the outer surface of the insulating part has an annular platform for positioning in conjunction with the positioning groove, the conductive rubber ring is located at both ends of the annular platform, the inner wall of the conductive rubber ring is bonded to the conductive coating, and the outer wall is bonded to the metal housing.

[0016] The beneficial effects of the embodiments of this application are as follows: In this application, the cable joint uses a metal shell, which has high structural strength and can undergo a certain degree of elastic deformation. After the cable is subjected to external force, the metal shell can withstand greater stress, reducing the deformation of the joint body, thereby reducing the occurrence of damage to the rubber due to severe deformation and lowering the risk of leakage of the cable joint. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this application and these drawings without any creative effort.

[0018] Figure 1This is a schematic diagram of the structure of a cable connector provided in one embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the structure of the intermediate connector body; Figure 3 This is a schematic diagram of the structure of a connector provided in one embodiment of this application; Figure 4 for Figure 1 Cable connectors and Figure 3 A schematic diagram of the structure connected to the connecting seat in the middle; Figure 5 for Figure 3 A magnified view of part A in the image; Figures 1 to 5 The attached figures are labeled as follows: 1. Metal shell; 2. Connector body; 21. First shielding layer; 211. First covering section; 212. Second covering section; 22. Insulating layer; 23. Second shielding layer; 24. Connector insert; 25. Through hole; 26. First end; 27. Second end; 3. Conductive component; 31. Terminal; 32. Conductive rod; 4. Sealing component; 41. Sleeve; 42. Sealant; 5. Connecting component; 51. Connecting shell; 52. Connecting sleeve; 01. Wire core; 02. Insulator; 03. Insulating shield; 04. Metal shield; 05. Sheath. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the application.

[0020] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figure 1 As shown, the cable connector provided in this application includes a metal shell 1, a connector body 2, and a conductive component 3. The connector body 2 has an axially penetrating through-hole 25, and the conductive component 3 is disposed in the middle of the through-hole 25. The connector body 2 also has a first end 26 and a second end 27. The cable can pass through the through-hole 25 from the first end 26 and make contact with the conductive component 3 to conduct electricity. The second end 27 of the connector body 2 can be inserted into a connector base, and the conductive component 3 can make contact with the conductive core inside the connector base to conduct electricity, thereby achieving an electrical connection with the cable.

[0026] The metal housing 1 is cylindrical and fits around the outer periphery of the connector body 2. Additionally, the cable connector includes a connector, which also fits around the outer periphery of the connector body 2. One end of the metal housing 1 is flush with the first end 26 of the connector body 2, and the other end is connected to the connector. When the second end 27 of the connector body 2 is inserted into the connector base, the connector can be used to connect to the connector base. In this embodiment, the metal shell 1 can tightly wrap the connector body 2, which in turn can tightly wrap the cable. When the cable is under tension, it applies a shear force to the cable connector, which can cause deformation. Because this embodiment uses a metal shell, which has high structural strength and can withstand large shear forces, the deformation of the cable connector can be reduced, thereby reducing the risk of cable connector damage and the occurrence of leakage.

[0027] In some embodiments, such as Figure 2As shown, a connector insert 24 is provided in the through hole 25. The portion of the through hole 25 located between the connector insert 24 and the first end 26 can maintain a constant diameter. The portion of the through hole 25 located in the connector insert 24 away from the first end 26 has a gradually increasing diameter in the direction away from the first end 26, for insertion and mating with the connector seat. The conductive component 3 includes a terminal block 31 and a conductive rod 32, as shown... Figure 1 As shown, the connector insert 24 confines the terminal 31 to the side of the connector insert 24 near the first end 26. The end face of the terminal 31 near the first end 26 has a first insertion hole, and the other end face has a second insertion hole. The cable core 01 is inserted into the first insertion hole and fits against the inner wall of the first insertion hole, achieving conductivity between the core and the terminal 31. The conductive rod 32 is inserted into the terminal 31 through the second insertion hole, achieving conductivity with the terminal 31. The conductive rod 32 is also used to connect to the connector, achieving conductivity with the connector.

[0028] Optionally, the first and second sockets of the terminal block 31 are coaxially arranged and isolated by a blocking part in the terminal block 31, meaning the first and second sockets are not connected. Therefore, the stress borne by the cable and conductive rod 32 is transmitted to the terminal block 31 and then to the connector body 2, preventing stress from being directly transmitted to the cable and thus avoiding damage to the connection points and excessive connection resistance.

[0029] In some embodiments, such as Figure 2 As shown, the connector body 2 includes a first shielding layer 21, a first insulation layer 22, and a second shielding layer 23 arranged sequentially from the outside in. The first shielding layer 21 is used to shield induced voltage. Specifically, the current in a cable often changes, and this changing current can induce current in other conductors due to electromagnetic induction. In this embodiment, the first shielding layer 21 extends from the first end 26 to the second end 27 of the connector body 2. The cable core 01, conductive component 3, and conductive structure of the connector are all located inside the first shielding layer 21, thus shielding the electric field inside the entire cable connector and preventing leakage caused by electromagnetic induction. Furthermore, the first shielding layer 21 is attached to the metal shell 1, which can be grounded. The induced current generated by the first shielding layer 21 can be guided to the ground through the metal shell 1, preventing safety accidents caused by leakage and improving the safety of the cable connector.

[0030] Optionally, the second shielding layer 23 is located at the center of the connector body 2 in the axial direction. For example... Figure 1As shown, the terminal 31 is located inside the second shield. Due to the complex internal structure of the terminal 31, including the cable core 01, the terminal 31 itself, and the conductive rod 32, the electric field distribution at the terminal 31 is also complex. The terminal 31 contacts the cable core 01 with extremely high voltage, and the numerous protruding parts of the terminal 31 can easily cause the insulation layer 22 to break down, affecting the safety of the cable joint. The second shield 23 surrounds the terminal 31 and contacts it, thus the second shield 23 and the terminal 31 are at the same potential. The outer circumferential surface of the second shield 23 is flat, which makes the electric field more uniform, preventing excessively high electromotive force and improving the safety of the cable joint. Furthermore, in this application, a rounded corner structure is used between the circumferential and end faces of the second shield 23 to further avoid protruding positions and prevent the insulation layer 22 from being broken down.

[0031] The cable structure, from the inside out, includes a conductor 01, an insulator 02, an insulating shield 03, a metallic shield 04, and a sheath 05. The conductor 01 conducts electricity. The insulator 02 encloses the conductor 01 for insulation. The insulating shield 03 encloses the insulator 02, and the metallic shield 04 encloses the insulating shield 03. The insulating shield 03 has good contact with the shielded insulation layer 22 and is at the same potential as the metallic shield 04, thus preventing partial discharge between the insulation layer 22 and the sheath 05. The metallic shield 04 can generate current in the conductor 01. In the prior art, the connector body 2 of the cable joint also has a first end 26, through which the cable conductor 01 is inserted. The insertion point of the conductor 01 also carries the risk of induced current causing insulation layer 22 breakdown. To avoid this, the prior art uses a shielding structure around the through-hole 25 near the first end 26 of the connector body 2. The insulation layer 22 of the connector body 2 also extends to the first end 26, isolating the shielding structure from the first insulation layer 22. The structure of cable connectors in the prior art is relatively complex, increasing the manufacturing cost of the cable connectors.

[0032] In one specific embodiment of this application, such as Figure 2As shown, the insulation layer 22 is located inside the first shielding layer 21, extending from the second end 27 of the connector body 2 to a position at a first preset distance from the first end 26. The first shielding layer 21 includes a first covering section 211 and a second covering section 212. The first covering section 211 covers the outer periphery of the insulation layer 22, and the second covering section 212 is located between the insulation layer 22 and the first end 26, that is, the second covering section 212 directly covers the outer periphery of the cable. Compared with the prior art, this embodiment does not require a shielding structure for the cable near the first end 26; instead, the first shielding layer 21 provides the shielding function, simplifying the cable connector structure. The insulation layer 22 also does not need to extend to the first end 26 of the connector body 2, avoiding the problem of insulation layer 22 near the first end 26 of the connector body 2 being broken down.

[0033] High-voltage devices can cause creepage, resulting in leakage. In this embodiment, the safety distance D between the second shielding layer 23 and the second covering section is greater than a preset value to prevent current from being conducted to the first shielding layer 21 through creepage, thus avoiding leakage. Figure 1 In the embodiment shown, the preset value is 83mm. The safety distance D can be selected as a value greater than 83mm. In other embodiments, the preset value can be determined according to the voltage magnitude, which is not limited here.

[0034] In some embodiments, such as Figure 1 As shown, the distance between the second shielding layer 23 and the first end 26 is greater than the distance between the terminal 31 and one end of the first end 26. Therefore, the terminal 31 is completely located inside the second shielding layer 23, and the electric field of the terminal 31 can be completely shielded by the second shielding layer 23, ensuring the safety of the terminal 31.

[0035] In some embodiments, the cable connector further includes a sealing component 4. For example... Figure 1 As shown, the sealing component 4 is arranged around the first end 26 and the cable, and is used to seal the connection between the connector body 2 and the cable. The sealing component 4 is sleeved on the outer periphery of the connector body 2, and also wraps around the metal shell 1, with the cable located inside the sealing component 4. The sealing component 4 can seal the end of the cable connector, preventing water or dust from entering between the cable and the cable connector, thus improving the sealing performance of the cable connector. In addition, the sealing component 4 wrapping around the metal shell 1 can also improve the structural strength of the cable connector. When the cable is subjected to shear or tensile forces, the sealing component 4 can share the stress on the cable, thereby reducing the risk of damage to the cable connector during use. The sealing component 4 can be connected to the metal shell 1 by means of threaded connection, interference fit, etc.

[0036] In some embodiments, such as Figure 1As shown, the sealing assembly 4 includes a sleeve 41, with a portion of the sleeve 41 fitted onto the outside of the first end 26 and the remainder fitted onto the outer circumference of the cable. Optionally, the sleeve 41 is a cold shrink tubing. The cold shrink tubing is positioned at the connection between the cable and the connector body 2. Since the connector body 2 and the cable have different diameters, the cold shrink tubing portion can be fitted onto the outside of the metal housing 1 via an interference fit, while the remainder is fitted onto the outer circumference of the cable, tightly wrapping the cable and improving the sealing performance of the cable connector. The cold shrink tubing has good insulation properties and does not require deformation through heating or other methods, thus providing high safety. Of course, the sleeve 41 can also be made of heat shrink tubing or other tubing materials. In other embodiments, the sleeve 41 can also be connected to the metal housing 1 via threaded connections, snap-fit ​​connections, or other methods.

[0037] In some embodiments, a receiving space is formed between the sleeve 41 and the connector body 2 to accommodate the cable, and the sealing assembly 4 further includes a sealant 42 disposed within the receiving space. Figure 1 As shown, the receiving space is located between the sleeve 41, the connector body 2, and the cable. The sealant 42 is disposed within this receiving space, further improving the sealing performance of the cable connector. Optionally, the cold shrink tubing can be pre-movably fitted around the outer periphery of the cable, and then the sealant 42 can be wrapped around the cable near the connector body 2. After the sealant 42 is wrapped, the cold shrink tubing is moved and fitted around the outer periphery of the metal housing 1, ensuring the cold shrink tubing tightly wraps around the metal housing 1 and the cable. Of course, the sealant 42 can also be applied using filling or other methods; this is not limited here.

[0038] In this embodiment, the cable joint uses a sealing component 4 to seal the end connected to the cable, improving the sealing performance of the cable joint and enabling it to withstand the tensile stress on the cable, thereby increasing the structural strength of the cable joint and reducing the risk of cable joint damage. Furthermore, the sealing component 4 employs a two-layer seal of sleeve 41 and sealant 42, further enhancing the sealing and insulation performance of the cable joint.

[0039] This application also provides a connector. Figure 3 A two-way connector is shown, with both ends being sockets. Cable connectors in any of the above embodiments can be plugged into these sockets. In other embodiments, the connector can be a three-way connector, a four-way connector, a six-way connector, etc., and is not limited thereto. The more sockets a connector has, the more cable connectors it can connect.

[0040] exist Figure 3In the illustrated embodiment, the connector includes a metal outer shell, an insulating part, and a conductive core arranged sequentially from the outside in. The metal outer shell is cylindrical and can be grounded. The end of the insulating part is tapered; specifically, the diameter of the insulating part gradually decreases towards the insertion port. An annular insertion port is formed between the metal outer shell and the insulating part, into which the connector body 2 can be inserted. The conductive core is located in the center of the insulating part and has a central insertion port. The conductive rod 32 of the cable connector can be inserted into the central insertion port, connecting the cable core 01 to the conductive core.

[0041] Optionally, the cable connector may also include a connecting assembly 5 for connecting the metal housing 1 of the cable connector to the metal housing of the connector base. Figure 4 As shown, the outer periphery of the connector body 2 has circumferentially distributed limiting bosses, and the metal shell 1 is disposed between the limiting bosses and the first end 26 of the connector body 2. The connecting assembly 5 may include a connecting sleeve 52 and a connecting housing 51. Both the connecting housing 51 and the connecting sleeve 52 are made of conductive material, specifically metal. The connecting housing 51 can be sleeved on the end of the metal shell 1 away from the first end 26 of the connector body 2, and the connecting housing 51 can be fixedly connected to the metal shell 1 by means of a set screw or the like. The inner surface of the connecting housing 51 has a stepped groove, which abuts against the side of the limiting boss away from the metal shell, thereby achieving the axial positioning of the connecting housing 51 and the metal shell 1 in the cable connector. The connecting sleeve 52 is rotatably sleeved on the end of the connecting housing 51 away from the metal shell 1, and the connecting sleeve 52 can also be threadedly connected to the metal shell, thereby connecting the metal shell 1 to the metal shell. When the cable connector is inserted into the socket, the metal shell can be grounded by being connected to the metal shell 1 through the connecting assembly 5.

[0042] In some embodiments, the outer surface of the insulating portion away from the conductive core has a conductive coating. For example... Figure 3 and Figure 5 As shown, the battery cell is located inside the insulation layer. A changing electric field passes through the battery cell, and the conductive coating on the outer surface of the insulation layer generates an induced current, which serves to shield the electric field inside the connector. The conductive coating is also attached to the metal casing and grounded through the metal casing. Grounding the conductive coating ensures that it is at zero potential, preventing excessive potential difference between the battery cell and the metal casing or partial discharge in the metal casing structure that could cause insulation breakdown, thus improving the safety of the connector.

[0043] Optional, such as Figure 3 As shown, the inner wall of the metal casing has a circumferentially arranged positioning groove, and the outer wall of the insulating part has a circumferentially arranged annular platform. The axial length of the annular platform is less than the axial length of the positioning groove, so the annular platform can be inserted into the positioning groove. The annular platform fits against the bottom of the positioning groove, and the portions of the insulating part located at both ends of the annular platform fit against the top of the side wall of the positioning groove. A conductive coating is applied to the portion of the insulating part that fits against the metal casing.

[0044] In some embodiments, the connector further includes a conductive rubber ring, such as Figure 3 As shown, conductive rubber rings are located at both ends of the ring platform. The inner wall of the conductive rubber ring is bonded to the conductive coating, and the outer wall is bonded to the metal shell. The side walls of the ring platform and the side walls of the positioning groove are bonded to the conductive rubber rings from both sides. The conductive rubber rings can buffer the force between the insulating part and the metal shell, and also enable the conductive coating on the outer surface of the insulating part to conduct electricity between the insulating part and the metal shell.

[0045] In this embodiment, the metal casing of the connector is grounded. When the cable connector is connected to the connector, the metal casing 1 is conductive to the metal casing, thereby grounding the metal casing 1 and improving the safety of the connector and the cable connector. A conductive coating is provided on the outer peripheral surface of the insulating part. The conductive coating is attached to and conductive to the metal casing. The metal casing can ground the conductive coating, and the current induced by the conductive coating can be conducted to the ground through the metal casing, further improving the safety of the connector.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A cable connector, characterized in that, It includes the connector body, metal housing, and conductive components, among which, The connector body has a through hole, the conductive component is disposed in the middle of the through hole, and the connector body also has a first end and a second end. The first end is used for the cable to pass through the through hole and contact the conductive component, and the second end is used for insertion into the connector base. The conductive component is used to connect the cable to the connector; The metal shell is cylindrical and is fitted around the outer periphery of the connector body, extending to the first end.

2. The cable connector according to claim 1, characterized in that, The connector body includes an insulating layer and a first shielding layer. The first shielding layer has a first covering section and a second covering section distributed along the axial direction. The insulating layer is separated from the first end by a first preset distance. The first covering section covers the outer periphery of the insulating layer, and the second covering section is located between the insulating layer and the first end.

3. The cable connector according to claim 1, characterized in that, It also includes a sealing assembly disposed around the first end and the cable for sealing between the connector body and the cable.

4. The cable connector according to claim 3, characterized in that, The sealing assembly includes a sleeve, a portion of which is fitted onto the outside of the first end, and the remainder is fitted onto the outer periphery of the cable.

5. The cable connector according to claim 4, characterized in that, A receiving space is formed between the sleeve and the connector body to accommodate the cable, and the sealing assembly further includes a sealant disposed in the receiving space.

6. The cable connector according to claim 2, characterized in that, The connector body further includes a second shielding layer, the conductive component includes a terminal block, the second shielding layer is located in the middle of the connector body in the axial direction, the second shielding element is arranged around the terminal block to shield the electric field between the terminal block and the cable, and the insulating layer is used to insulate between the first shielding layer and the second shielding layer.

7. The cable connector according to claim 6, characterized in that, The safe distance between the second shielding layer and the second covering segment is greater than a preset value.

8. A connector, characterized in that, It includes a metal housing and a socket for mating with a cable connector as described in any one of claims 1 to 7, wherein the metal housing is in communication with the cable connector when it is inserted into the socket, and the metal housing is grounded.

9. The connector according to claim 8, characterized in that, It also includes an insulating part and a conductive core, the conductive core being disposed inside the insulating part, and the outer surface of the insulating part away from the conductive core having a conductive coating.

10. The connector according to claim 9, characterized in that, It also includes a conductive rubber ring, the inner wall of the metal shell has a positioning groove extending axially, the outer surface of the insulating part has an annular platform for positioning in conjunction with the positioning groove, the conductive rubber ring is located at both ends of the annular platform, the inner wall of the conductive rubber ring is in contact with the conductive coating, and the outer wall is in contact with the metal shell.

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