High temperature resistant radio frequency coaxial connector

Abstract

The invention relates to a high temperature resistant radio frequency coaxial connector, and relates to the technical field of radio frequency connection, the high temperature resistant radio frequency coaxial connector comprises a housing and a pin, the housing is provided with a connecting hole, the pin is inserted into the connecting hole, the pin is provided with a first glass insulator, the first glass insulator is provided with an assembly block, and the assembly block is connected with the housing. The application has the effect of improving the stability of signal transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency connection, and in particular to a high-temperature resistant radio frequency coaxial connector. Background Art

[0002] Radio frequency connectors mainly play the role of signal interconnection and power transmission in various electronic devices. After the radio frequency connectors are connected to the circuit, they can transmit various voltage and current signals, microwave radio frequency signals or power, and are widely used in the fields of electronics, communication, computer, automobile, energy, aerospace, etc.

[0003] Common radio frequency coaxial connectors generally include a housing and a pin. The pin is inserted into the jack of the housing, and the housing and the pin are connected together by welding or other means. The inner wall material of the jack of the common radio frequency coaxial connector housing is beryllium bronze plated with gold, and an insulating material is provided on the inner wall to wrap the pin. The common insulating material is PTFE.

[0004] When radio frequency coaxial connectors are applied, they often generate relatively high heat. In a high-temperature environment for a long time, the insulating material is not resistant to high temperature, and the elasticity of the insulating material in the jack gradually loses, resulting in the deformation of the insulating material at the jack connection, causing the pin to shake or shift, affecting the stability of the electrical signal connection, and resulting in unstable signal transmission of the connector. Summary of the Invention

[0005] In order to improve the stability of signal transmission, the present application provides a high-temperature resistant radio frequency coaxial connector.

[0006] The high-temperature resistant radio frequency coaxial connector provided by the present application adopts the following technical solutions: A high-temperature resistant radio frequency coaxial connector includes a housing and a pin. The housing is provided with a connection hole, the pin is inserted into the connection hole, the pin is provided with a first glass insulator, the first glass insulator is provided with an assembly block, and the assembly block is connected to the housing.

[0007] By adopting the above technical solution, the inner wall material of the connection hole of the existing RF connector housing is mostly bronze material, and an auxiliary pad made of PTFE insulating material is provided to limit and fix the pin inserted into the connection hole. However, after the RF connector is used for a long time, it will generate high temperature, which will soften the PTFE, resulting in the possible shaking or tilting of the pin, and problems such as unstable signal transmission, and easy influence on mechanical performance and sealing performance. In this application, the inner wall of the housing connection hole is made of titanium alloy material instead of bronze material to improve the high-temperature resistance performance, overall quality and hardness. At the same time, the first glass insulator made of glass is used as the insulating material, and together with the assembly block, the first glass insulator is connected and arranged between the pin and the housing, thus replacing the PTFE as the insulating material. Compared with traditional polymer plastics, the glass material has better high-temperature resistance performance, improves the high-temperature resistance performance of the connector, thereby reducing the possibility of the pin shaking, improving the stability of the pin, and further improving the stability of signal transmission, so as to reduce the influence of problems such as unstable signal transmission, poor mechanical performance and sealing performance.

[0008] Preferably, the housing is provided with a connection groove communicating with the connection hole, and the first glass insulator and the assembly block are inserted into the connection groove.

[0009] By adopting the above technical solution, the first glass insulator and the assembly block are inserted into the connection groove, and the first glass insulator and the assembly block abut against the inner wall of the connection groove, which is convenient for welding or other assembly methods, and at the same time can improve the stability of the connection assembly, thereby improving the stability of the pin installation and assembly, and further improving the stability of signal transmission.

[0010] Preferably, it further includes an inner conductor, the inner conductor is arranged in the connection hole and connected to the pin, the inner conductor is provided with a first jack, and the pin is inserted into the first jack.

[0011] By adopting the above technical solution, the pin is inserted into the first jack. Through the connection circuit built in the inner conductor, the inner conductor is signal-connected to the pin. When the RF connection is made, the corresponding connector inserted into the connection hole realizes signal connection with the pin through the inner conductor, forming a complete connection circuit. At the same time, by setting the inner conductor, the contact area with the corresponding connector is increased, thereby improving the connection stability of the corresponding connector and the stability of the transmitted signal.

[0012] Preferably, the end of the inner conductor away from the pin is provided with a second jack.

[0013] By adopting the above technical solution, the inner conductor is provided with a second jack for inserting the plug of the corresponding connecting member, further improving the contact area with the corresponding connecting member and enhancing the connection stability. At the same time, the plug of the corresponding connecting member is inserted into the second jack and abuts against the inner wall of the second jack, so that the pin is electrically connected to the plug of the corresponding connecting member through the internal circuit of the inner conductor, thus conducting the connection circuit. At the same time, the plug of the corresponding connecting member is inserted into the second jack, increasing the sealing performance and reducing the possibility of external impurities affecting the connection stability of the plug of the corresponding connecting member, and enhancing the stability of the transmitted signal.

[0014] Preferably, the inner conductor is provided with a second glass insulator, and the outer shell is provided with a clamping assembly for clamping the inner conductor.

[0015] By adopting the above technical solution, the second glass insulator is used as an insulating material for insulation treatment. After the inner conductor and the pin are assembled together and inserted into the connection hole, the clamping assembly clamps the second glass insulator, thereby improving the stability of the pin when assembling the assembly block and the outer shell, reducing the possibility of the pin shaking when assembling the assembly block and the outer shell, which may cause the pin and the inner conductor to be skewed after assembly, and thus reducing the possibility of unstable connection signals. At the same time, the outer wall of the second glass insulator can be frosted to increase the friction force, thereby enhancing the clamping stability.

[0016] Preferably, the clamping assembly includes a clamping rod and a clamping spring. The inner wall of the connection hole is provided with a clamping groove. The clamping rod is slidably arranged in the clamping groove. The clamping spring is arranged in the clamping groove and connected to the clamping rod. The clamping rod can be slidably inserted into the connection hole and abuts against the second glass insulator.

[0017] By adopting the above technical solution, the clamping spring is used to push the clamping rod to abut against the second glass insulator on the inner conductor inserted into the connection hole, thereby clamping the inner conductor to improve the stability of the inner conductor and the pin inserted into the connection hole. On the one hand, it keeps the pin stable, facilitating the assembly of the outer shell and the assembly block, and also reducing the possibility of the pin being skewed after assembly, which may cause unstable transmission signals. On the other hand, it improves the stability of the pin during use, reduces the possibility of the pin shaking affecting signal transmission, and enhances the stability of signal transmission.

[0018] Preferably, the outer shell is provided with an auxiliary groove communicating with the clamping groove. An auxiliary plate is slidably arranged in the auxiliary groove. The auxiliary plate can abut against the first glass insulator. An auxiliary spring connected to the auxiliary plate is arranged in the auxiliary groove. The auxiliary plate is provided with an auxiliary hole through which the clamping rod can pass.

[0019] By adopting the above technical solution, when the pin and the inner conductor are inserted into the connection hole of the outer shell, the first glass insulator abuts against and pushes the auxiliary plate to slide in the auxiliary groove, and the auxiliary plate slides in the auxiliary groove and compresses the auxiliary spring. When the second glass insulator and the assembly block abut against the outer shell, at this time, the auxiliary plate slides a certain distance, and the auxiliary hole is aligned with the clamping rod. At this time, the clamping spring resumes and pushes the clamping rod through the auxiliary hole and into the connection hole. The clamping rod abuts against the second glass insulator, thus completing the clamping. The clamping action is combined with the action of assembling the pin onto the outer shell, which is convenient for use. When the pin is assembled onto the outer shell, the clamping rod automatically completes the clamping of the second glass insulator, thereby improving the stability of the pin during subsequent assembly and welding, reducing the assembly steps at the same time, and improving the convenience of assembly.

[0020] Preferably, the second glass insulator is provided with a clamping hole, and the clamping rod can be inserted into the clamping hole.

[0021] By adopting the above technical solution, the clamping rod is inserted into the clamping hole opened on the second glass insulator, further improving the stability of the clamping rod clamping the second glass insulator, facilitating the assembly between the assembly block and the outer shell, and improving the convenience of assembly.

[0022] Preferably, the clamping groove penetrates through the outer side wall of the outer shell. An installation block is inserted into the clamping groove. The installation block is connected to one end of the clamping spring away from the clamping rod. The outer shell is sleeved with an installation ring. The installation ring covers the clamping groove and abuts against the installation block. The installation ring is connected to the outer shell.

[0023] By adopting the above technical solution, one end of the clamping spring is connected to the clamping rod, and the other end of the clamping spring is connected to the installation block. When assembling the outer shell, after inserting the auxiliary spring and the auxiliary plate into the auxiliary groove, insert the clamping rod, the clamping spring and the installation block into the clamping groove in sequence so that the clamping rod abuts against the auxiliary plate. Continue to push the installation block so that the installation block is completely inserted into the clamping and compresses the clamping spring. Then, sleeve the installation ring on the outer shell and push the installation ring so that the installation ring moves to cover the clamping groove and abuts against the installation block. Then, connect the installation ring and the outer wall of the outer shell together by welding or other means. The operation is simple and convenient, facilitating the assembly of the outer shell.

[0024] A processing method for a high-temperature-resistant radio frequency coaxial connector: The first step: Assemble the pin, the first glass insulator and the assembly block together by glass sintering; The second step: Assemble the second glass insulator and the inner conductor together, and assemble the inner conductor and the pin together by laser welding so that the internal circuits of the pin and the inner conductor are electrically connected; The third step: Insert the inner conductor and the pin into the connection hole, and assemble the assembly block and the outer shell together by laser welding; The fourth step: Treat the surface of the assembly block to improve the conductivity and corrosion resistance.

[0025] By adopting the above technical scheme, the first glass insulator connecting pin and assembly block are made by glass sintering, and then the second glass insulator is fixedly assembled on the outer wall of the inner conductor by gluing or other means, and then the pin and the inner conductor are assembled by laser welding, so that the internal circuits of the inner conductor and the pin are connected to form the pin of the connector, and then the inner conductor and the pin are inserted into the connecting hole, so that the second glass insulator and the assembly block are against the side wall of the outer shell, and then the assembly block and the outer shell are assembled together by laser welding, and the surface of the assembly block is treated to improve the conductivity and corrosion resistance, so as to complete the production of the RF coaxial connector, wherein the welding method adopts laser welding, which is convenient for operation, stable assembly, and also improves the high temperature performance.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By providing a shell, a pin, a connection hole, a first glass insulator, an assembly block and a connection groove, the first glass insulator is sintered to connect the assembly block and the pin, the pin is inserted into the connection hole of the shell, and the first glass insulator and the assembly block are inserted into the connection groove and abut against the inner wall of the connection groove, and the shell and the assembly block are connected by welding. Compared with traditional polymer plastics, glass materials have better high temperature resistance, improve the high temperature resistance of the connector, thereby reducing the possibility of pin shaking, improving the stability of the pin, and thus improving the stability of signal transmission; 2. By arranging an inner conductor, a first jack, a second jack, a second glass insulator and a clamping assembly, a pin is inserted into the first jack at one end of the inner conductor, and a plug of a corresponding connector is inserted into the second jack at the other end of the inner conductor, so that the signal connection pin and the corresponding connector plug are connected, and the RF signal connection can be completed through the matching equipment at the other end of the pin. At the same time, the second glass insulator position on the inner conductor is clamped by the clamping assembly, so as to improve the stability of the inner conductor fixation, thereby improving the stability of signal transmission; 3. By arranging a clamping rod, a clamping spring, a clamping groove, an auxiliary groove, an auxiliary plate, an auxiliary spring and an auxiliary hole, during the process of inserting the inner conductor into the connecting hole, the first glass insulator abuts and pushes the auxiliary plate to move in the auxiliary groove and compress the auxiliary spring. When the first glass insulator abuts against the outer shell, the auxiliary hole is aligned with the clamping rod. At this time, the clamping spring recovers and pushes the clamping rod through the auxiliary hole to be inserted into the connecting hole to abut against the second glass insulator, thereby completing the clamping. The operation is simple and convenient, and the use is convenient. The clamping process is combined with the process of assembling the inner conductor and the outer shell, thereby simplifying the operation and improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of a high temperature resistant radio frequency coaxial connector provided in an embodiment of the present application.

[0028] Figure 2 This is a cross-sectional view of a high-temperature-resistant RF coaxial connector provided by an embodiment of the present application.

[0029] Figure 3 It is Figure 2 an enlarged view of area A in

[0030] Explanation of reference numerals: 1. Outer shell; 11. Connection hole; 12. Connection groove; 13. Auxiliary groove; 14. Clamping groove; 2. Pin; 21. First glass insulator; 22. Assembly block; 3. Inner conductor; 31. First jack; 32. Second jack; 33. Second glass insulator; 331. Clamping hole; 4. Clamping assembly; 41. Clamping rod; 42. Clamping spring; 5. Auxiliary plate; 51. Auxiliary spring; 52. Auxiliary hole; 6. Mounting block; 61. Mounting ring. Detailed implementation manners

[0031] The following further elaborates on the present application in conjunction with the Figures 1-3 accompanying drawings.

[0032] An embodiment of the present application discloses a high-temperature-resistant RF coaxial connector. Referring to Figure 1 and Figure 2 , it includes an outer shell 1 and a pin 2. A connection hole 11 runs through the middle of the outer shell 1. A first glass insulator 21 made of glass is fixedly arranged around the outside of the pin 2, and an annular assembly block 22 is fixedly arranged on the outer side wall of the first glass insulator 21. A connection groove 12 communicating with the connection hole 11 is arranged on the side wall of one end of the outer shell 1. The first glass insulator 21 and the assembly block 22 are adaptively inserted into the connection groove 12, and the assembly block 22 is fixedly connected to the outer shell 1 by welding. The inside of the connection hole 11 is made of titanium alloy material to improve the high-temperature resistance performance, overall quality and hardness. The first glass insulator 21 is made of glass material. Compared with traditional polymer plastics, the glass material has better high-temperature resistance performance, which improves the high-temperature resistance performance of the connector, thereby reducing the possibility of the pin 2 shaking, improving the stability of the pin 2, and further improving the stability of signal transmission.

[0033] To improve the stability of RF connection, referring to Figure 2 , it further includes an inner conductor 3. The two ends of the inner conductor 3 are respectively provided with a first jack 31 and a second jack 32. The pin 2 is adaptively inserted into the first jack 31, and the inner conductor 3 is inserted into the connection hole 11. The second jack 32 is for the insertion of the plug of the corresponding connector (not shown in the figure), so that the inner conductor 3 electrically connects the corresponding connector and the pin 2 through the internal circuit, and cooperates with the end of the pin 2 away from the inner conductor 3 to be plugged and matched with an external transmission structure (not shown in the figure), thereby completing the transmission of RF signals. The internal circuits of the inner conductor 3 and the pin 2 are not shown in the figure. The inner conductor 3 increases the overall RF connection stability by increasing the connection area.

[0034] To improve the overall stability, referring to Figure 2 and Figure 3 , a second glass insulator 33 made of glass is fixedly sleeved on the outer wall of the inner conductor 3, and a plurality of clamping holes 331 are arranged on the outer side wall of the second glass insulator 33. The outer shell 1 is provided with a clamping assembly 4 for clamping the inner conductor 3. The clamping assembly 4 includes a clamping rod 41 and a clamping spring 42. A plurality of clamping grooves 14 communicating with the connection holes 11 are arranged on the outer side wall of the outer shell 1. The clamping rod 41 is slidably arranged in the clamping grooves 14 and can enter the connection holes 11 and be inserted into the clamping holes 331 of the second glass insulator 33. The clamping spring 42 is arranged in the clamping grooves 14, and a mounting block 6 is also adaptively inserted in the clamping grooves 14. One end of the clamping spring 42 is fixedly connected to the end wall of the clamping rod 41 far from the second glass insulator 33, and the other end of the clamping spring 42 is fixedly connected to the mounting block 6. An installation ring 61 is sleeved on the outer shell 1. The installation ring 61 covers the clamping grooves 14 and abuts against the mounting block 6, and the outer shell 1 is fixedly welded on the outer shell 1. By inserting the clamping rod 41 into the clamping holes 331 of the second glass insulator 33, the inner conductor 3 is clamped and fixed, so as to improve the overall stability and reduce the possibility that the shaking of the inner conductor 3 affects the signal transmission quality.

[0035] To improve the convenience of assembly, referring to Figure 2 and Figure 3 , a circle of auxiliary grooves 13 communicating with the clamping grooves 14 are arranged on the inner bottom wall of the connection groove 12. An annular auxiliary plate 5 is slidably arranged in the auxiliary grooves 13. The auxiliary plate 5 can abut against the first glass insulator 21. A plurality of auxiliary springs 51 are arranged in the auxiliary grooves 13. One end of the auxiliary springs 51 is fixedly connected to the end wall of the auxiliary plate 5 far from the first glass insulator 21. The auxiliary plate 5 is provided with a plurality of auxiliary holes 52 communicating with the clamping grooves 14, and the clamping rod 41 can pass through the auxiliary holes 52. In another embodiment, an inclined surface is arranged on the end wall of the clamping rod 41 to facilitate the clamping rod 41 to pass through the auxiliary holes 52 and be inserted into the clamping holes 331. When the inner conductor 3 and the pin 2 are inserted into the connection holes 11, the first glass insulator 21 and the assembly block 22 are inserted into the connection groove 12. During this process, the first glass insulator 21 abuts against and pushes the auxiliary plate 5 to move. The auxiliary plate 5 moves in the auxiliary grooves 13 and compresses the auxiliary springs 51. When the first glass insulator 21 and the assembly block 22 abut against the inner bottom wall of the connection groove 12, at this time, the auxiliary holes 52 are aligned with the clamping grooves 14, and the clamping spring 42 restores and pushes the clamping rod 41 to pass through the clamping grooves 14. The clamping rod 41 enters the connection holes 11 and is inserted into the clamping holes 331 on the second glass insulator 33. By combining the clamping action with the assembly action, the operation is simplified and the convenience of assembly is improved.

[0036] The embodiment of the present application discloses a processing method for a high-temperature resistant radio frequency coaxial connector: Step 1: Sinter the first glass insulator 21 by means of glass sintering and assemble the pin 2 and the assembly block 22 together through the first glass insulator 21; Step 2: Sheath and adhesively fix the second glass insulator 33 on the inner conductor 3, and start several clamping holes 331 on the second glass insulator 33; Step 3: Insert the pin 2 into the first jack 31 of the inner conductor 3, and assemble the inner conductor 3 and the pin 2 by means of laser welding, and make the pin 2 conduct with the internal circuit of the inner conductor 3; Step 4: Insert the auxiliary spring 51 and the auxiliary plate 5 into the auxiliary groove 13 in sequence, and insert the clamping rod 41, the clamping spring 42 and the mounting block 6 into the clamping groove 14 from the outer side wall of the housing 1 in sequence, so that the clamping rod 41 abuts against the auxiliary plate 5, insert the mounting block 6 completely into the clamping groove 14 and compress the clamping spring 42, sleuth the mounting ring 61 on the housing 1 and cover the clamping groove 14 to abut against the mounting block 6, and weld the mounting ring 61 and the outer side wall of the housing 1 together by means of laser welding; Step 5: Insert the inner conductor 3 and the pin 2 into the connection hole 11, and make the first glass insulator 21 and the assembly block 22 insert into the connection groove 12. At this time, the clamping rod 41 inserts into the clamping groove 14 of the second glass insulator 33, and assemble the assembly block 22 and the housing 1 together by means of laser welding; Step 6: Perform electroplating treatment on the surface of the assembly block 22 to improve the conductivity and corrosion resistance.

[0037] Assemble the components of the high-temperature resistant radio frequency coaxial connector in sequence through the above steps, so as to produce the high-temperature resistant radio frequency coaxial connector. The assembly operation is simple and convenient, which is convenient for large-scale mass production. At the same time, the produced high-temperature resistant radio frequency coaxial connector has good physical properties and good high-temperature resistance.

[0038] The implementation principle of a high-temperature resistant radio frequency coaxial connector in an embodiment of the present application is as follows: Connect the pin 2 and the housing 1 through the first glass insulator 21 made of glass material. Compared with traditional polymer plastics, the glass material has better high-temperature resistance, which improves the high-temperature resistance of the connector, thereby reducing the possibility of the pin 2 shaking under high-temperature conditions. At the same time, during the assembly process, when the pin 2 and the inner conductor 3 are inserted into the connection hole 11, after the second glass insulator 33 pushes the auxiliary plate 5 to move, the clamping spring 42 restores to push the clamping rod 41 to pass through the auxiliary hole 52 and insert into the clamping hole 331 of the second glass insulator 33. Through the clamping and locking of the clamping rods 41 in multiple directions, the stability of the inner conductor 3 and the pin 2 during use is improved, and the possibility of the pin 2 and the inner conductor 3 shaking or moving during use is reduced, so as to reduce the possibility of signal interruption caused by poor contact, and further improve the stability of signal transmission.

[0039] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A high-temperature resistant radio frequency coaxial connector, characterized in that: It includes a housing (1) and a pin (2). The housing (1) is provided with a connection hole (11), the pin (2) is inserted into the connection hole (11), the pin (2) is provided with a first glass insulator (21), the first glass insulator (21) is provided with an assembly block (22), and the assembly block (22) is connected to the housing (1).

2. The high-temperature resistant radio frequency coaxial connector according to claim 1, wherein: The housing (1) is provided with a connection groove (12) communicating with the connection hole (11), and the first glass insulator (21) and the assembly block (22) are inserted into the connection groove (12).

3. A high-temperature resistant radio frequency coaxial connector according to claim 1, characterized in that: It further includes an inner conductor (3). The inner conductor (3) is arranged in the connection hole (11) and connected to the pin (2). The inner conductor (3) is provided with a first jack (31), and the pin (2) is inserted into the first jack (31).

4. The high-temperature resistant radio frequency coaxial connector according to claim 3, wherein: One end of the inner conductor (3) far from the pin (2) is provided with a second jack (32).

5. The high-temperature resistant radio frequency coaxial connector according to claim 3, wherein: The inner conductor (3) is provided with a second glass insulator (33), and the housing (1) is provided with a clamping assembly (4) for clamping the inner conductor (3).

6. The high-temperature resistant radio frequency coaxial connector according to claim 5, characterized in that: The clamping assembly (4) includes a clamping rod (41) and a clamping spring (42). The inner wall of the connection hole (11) is provided with a clamping groove (14). The clamping rod (41) is slidably arranged in the clamping groove (14). The clamping spring (42) is arranged in the clamping groove (14) and connected to the clamping rod (41). The clamping rod (41) can be slidably inserted into the connection hole (11) and abuts against the second glass insulator (33).

7. The high-temperature resistant radio frequency coaxial connector according to claim 6, wherein: The housing (1) is provided with an auxiliary groove (13) communicating with the clamping groove (14). An auxiliary plate (5) is slidably arranged in the auxiliary groove (13). The auxiliary plate (5) can abut against the first glass insulator (21). An auxiliary spring (51) connected to the auxiliary plate (5) is arranged in the auxiliary groove (13). The auxiliary plate (5) is provided with an auxiliary hole (52) through which the clamping rod (41) can pass.

8. The high-temperature-resistant radio frequency coaxial connector according to claim 7, characterized in that: The second glass insulator (33) is provided with a clamping hole (331) into which the clamping rod (41) can be inserted.

9. The high-temperature resistant radio frequency coaxial connector according to claim 6, characterized in that: The clamping groove (14) penetrates the outer side wall of the housing (1). An installation block (6) is inserted into the clamping groove (14). The installation block (6) is connected to one end of the clamping spring (42) far from the clamping rod (41). The housing (1) is sleeved with an installation ring (61). The installation ring (61) covers the clamping groove (14) and abuts against the installation block (6). The installation ring (61) is connected to the housing (1).

10. A processing method for manufacturing a high-temperature-resistant radio frequency coaxial connector as claimed in claim 6, characterized in that: The first step: Assemble the pin (2), the first glass insulator (21) and the assembly block (22) together by glass sintering; The second step: Assemble the second glass insulator (33) and the inner conductor (3) together, and assemble the inner conductor (3) and the pin (2) together by laser welding so that the internal circuits of the pin (2) and the inner conductor (3) are electrically connected; Step 3: Insert the inner conductor (3) and the pin (2) into the connection hole (11), and assemble the assembly block (22) and the housing (1) together by laser welding; Step 4: Treat the surface of the assembly block (22) to improve the conductivity and corrosion resistance.

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