Protection mechanism for power conversion box

Abstract

The invention discloses a protection mechanism for a power conversion box, and relates to the technical field of power protection, the protection mechanism comprises a conversion main body, the bottom of one side of the inner wall of the conversion main body is fixedly connected with a protection shell, one side of the outer wall of the protection shell is fixedly connected with a mounting box, and the inner wall of the protection shell is provided with a protection assembly. A voltage stabilizer is fixedly connected to the center of one side of the outer wall of the mounting box, a wire is inserted into one side of the outer wall of the voltage stabilizer, and one end of the wire is inserted into the input end of the conversion body. According to the protection mechanism for the power conversion box, a micro valve arranged in the gas storage bin is started, and carbon dioxide gas filled in the gas storage bin is sprayed into the mounting pipe along the gas guide pipe, so that the problem that in the using process of a traditional protection mechanism for the power conversion box, when a circuit breaker is triggered and a power supply is cut off due to unstable voltage, power terminals are separated is further solved; the contact area is suddenly reduced, so that the local electric field is suddenly increased, the temperature of the generated arc is high, internal devices are damaged, and fire disasters are easily caused.

Description

Technical Field

[0001] This invention relates to the field of power protection technology, and specifically to a protection mechanism for a power conversion box. Background Technology

[0002] Power equipment is a power production and consumption system composed of power generation, transmission, transformation, distribution and consumption. Outdoor power supply equipment, namely outdoor power supply protection box, releases a lot of heat during operation, which remains inside the box and reduces the operating efficiency of the equipment. Therefore, an outdoor power supply protection box is needed to facilitate heat dissipation.

[0003] The existing technology has the following problems:

[0004] 1. During use, when the circuit breaker is triggered and the power is cut off due to unstable voltage, the contact area of ​​the power terminals decreases sharply at the moment of separation, resulting in a surge in the local electric field and a high arc temperature. This can not only damage the internal devices but also easily cause a fire.

[0005] 2. In the operation of existing power conversion boxes, the protection mechanism often causes the conversion box to lose power when a short circuit occurs, resulting in the equipment losing power and suddenly stopping. Summary of the Invention

[0006] The present invention provides a protection mechanism for a power conversion box to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A protection mechanism for a power conversion box includes a conversion body, a protective shell fixedly connected to the bottom of one side of the inner wall of the conversion body, and a mounting box fixedly connected to one side of the outer wall of the protective shell. A protective component is provided on the inner wall of the protective shell. A voltage regulator is fixedly connected to the center of one side of the outer wall of the mounting box, and a wire is inserted into one side of the outer wall of the voltage regulator. One end of the wire is inserted into the input end of the conversion body.

[0009] The protection component includes a mounting tube fixedly connected to the center of the inner cavity of the protection housing, and a connection terminal fixedly connected to one side of the outer wall of the mounting tube. A cable is inserted into the input end of the connection terminal, and a conductive post is fixedly connected to the output end of the connection terminal. A conductive tube is slidably connected to the outer wall of the conductive post, and the outer wall of the conductive tube is slidably connected to the inner wall of the mounting tube. A connecting wire is fixedly connected to one end of the outer wall of the conductive tube, and one end of the connecting wire is fixedly connected to the end of the outer wall of the voltage regulator away from the wire.

[0010] A further improvement of the technical solution of the present invention is that: both ends of the outer wall of the connecting terminal near the conductive post are fixedly connected to an electric telescopic rod, and the output end of the electric telescopic rod is fixedly connected to both ends of the outer wall of the conductive tube; a sealing plate is fixedly connected to one end of the outer wall of the conductive tube, and a sealing ring is fixedly connected to the outer wall of the sealing plate; and the outer wall of the sealing ring is slidably connected to the inner wall of the mounting tube.

[0011] A further improvement of the technical solution of the present invention is that: an elastic sealing tube is fixedly connected to one end of the outer wall of the sealing plate, and a gas guide tube is inserted into the inner wall of the elastic sealing tube; a gas storage chamber is installed at one end of the gas guide tube, and the bottom of the gas storage chamber is fixedly connected to the bottom of one side of the inner wall of the mounting box.

[0012] A further improvement of the technical solution of the present invention is that: both ends of the inner wall of the mounting tube are fixedly connected to a support frame, and the inner wall of the support frame is rotatably connected to a linkage rod, and one end of the outer wall of the linkage rod is fixedly connected to a push plate, and one side of the outer wall of the push plate is in contact with the outer wall of the conductive tube.

[0013] A further improvement of the technical solution of the present invention is that: a locking block is fixedly connected to the end of the outer wall of the linkage rod away from the push plate, and one end of the locking block is engaged with the outer wall of the conductive column.

[0014] A further improvement of the technical solution of the present invention is that: an electric wire is fixedly connected to one end of the outer wall of the linkage rod near the push plate, and a conductive block is fixedly connected to one end of the electric wire; the two ends of the outer wall of the conductive block are fixedly connected to the inner wall of the mounting tube; a shunt wire is fixedly connected to the middle of one side of the outer wall of the conductive block; and one end of the outer wall of the shunt wire is slidably connected to the end of the inner cavity of the sealing plate away from the sealing ring.

[0015] A further improvement of the technical solution of the present invention is that: one end of the shunt wire is fixedly connected to a parallel connector, and the bottom of the parallel connector is fixedly connected to the end of the inner wall of the mounting box away from the gas storage chamber, while the output end of the parallel connector is plugged into the input end of the conversion body.

[0016] A further improvement of the technical solution of the present invention is that: a contact block is fixedly connected to the side of the inner wall of the conductive tube away from the connecting line, and one side of the outer wall of the contact block is in contact with one end of the outer wall of the conductive column; a plurality of insulating elastic blocks are fixedly connected to one end of the inner wall of the conductive tube, and the outer wall of the insulating elastic blocks is in contact with the outer wall of the conductive column.

[0017] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0018] 1. This invention provides a protection mechanism for a power conversion box. By setting an elastic sealing tube at one end of the outer wall of the sealing plate, and during the movement of the sealing plate and the sealing ring, the gas guide pipe connected to the output end of the gas storage chamber is inserted into the elastic sealing tube. At this time, the micro valve built into the gas storage chamber is activated, and the carbon dioxide gas filled in the gas storage chamber is sprayed into the installation pipe along the gas guide pipe. This further solves the problem that in the traditional protection mechanism for power conversion boxes, when the circuit breaker is triggered and the power is cut off due to voltage instability, the contact area decreases sharply at the moment the power terminals separate, resulting in a surge in the local electric field and a high arc temperature. This not only damages the internal devices but also easily causes a fire.

[0019] 2. This invention provides a protection mechanism for a power conversion box. By setting a conductive block at one end of the inner wall of the mounting tube, the current in the wires at both ends enters the conductive block and flows along the branch wire set in the middle of one side of the outer wall of the conductive block into the parallel connector set at the end of the inner wall of the mounting box away from the gas storage chamber. The current is then quickly fed into the backup power branch set in the conversion body through the parallel connector. This further solves the problem that in the use of traditional power conversion box protection mechanisms, when a short circuit occurs, the conversion box often loses power, causing the equipment to lose power and suddenly stop. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the protective shell structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the mounting pipe structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the linkage structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the mounting pipe of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged diagram of point A in the middle.

[0026] In the diagram: 1. Converter body; 2. Protective housing; 3. Mounting box; 4. Voltage regulator; 5. Wire; 6. Mounting tube; 7. Connecting terminal; 8. Cable; 9. Conductive post; 10. Conductive tube; 11. Connecting wire; 12. Electric telescopic rod; 13. Sealing plate; 14. Sealing ring; 15. Elastic sealing tube; 16. Air duct; 17. Air storage chamber; 18. Support frame; 19. Linkage rod; 20. Push plate; 21. Locking block; 22. Wire; 23. Conductive block; 24. Diverter wire; 25. Parallel connector; 26. Contact block; 27. Insulating elastic locking block. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0028] like Figures 1 to 6 As shown in the embodiment of the present invention, a protection mechanism for a power conversion box includes a conversion body 1. A protective shell 2 is fixedly connected to the bottom of one side of the inner wall of the conversion body 1, and a mounting box 3 is fixedly connected to one side of the outer wall of the protective shell 2. A protection component is provided on the inner wall of the protective shell 2. A voltage regulator 4 is fixedly connected to the center of one side of the outer wall of the mounting box 3, and a wire 5 is inserted into one side of the outer wall of the voltage regulator 4. One end of the wire 5 is inserted into the input end of the conversion body 1. The protection component includes a mounting tube 6 fixedly connected to the center of the inner cavity of the protective shell 2, and a connecting terminal 7 is fixedly connected to one side of the outer wall of the mounting tube 6. A cable 8 is inserted into the input end of the connecting terminal 7. A conductive post 9 is fixedly connected to the output end of the connecting terminal 7, and a conductive tube 10 is slidably connected to the outer wall of the conductive post 9. The outer wall of the conductive tube 10 is slidably connected to the inner wall of the mounting tube 6. A connecting wire 11 is fixedly connected to one end of the outer wall of the conductive tube 10, and one end of the connecting wire 11 is connected to the outer wall of the voltage regulator 4 away from the wire 5. One end is fixedly connected, and both ends of the outer wall of the connecting terminal 7 near the conductive post 9 are fixedly connected to an electric telescopic rod 12. The output end of the electric telescopic rod 12 is fixedly connected to both ends of the outer wall of the conductive tube 10. One end of the outer wall of the conductive tube 10 is fixedly connected to a sealing plate 13, and the outer wall of the sealing plate 13 is fixedly connected to a sealing ring 14. The outer wall of the sealing ring 14 is slidably connected to the inner wall of the mounting tube 6. One end of the outer wall of the sealing plate 13 is fixedly connected to an elastic sealing tube 15, and the elastic sealing tube 15 is slidably connected to the inner wall of the mounting tube 6. A gas guide tube 16 is inserted into the inner wall of the plug tube 15. A gas storage chamber 17 is installed at one end of the gas guide tube 16, and the bottom of the gas storage chamber 17 is fixedly connected to the bottom of one side of the inner wall of the mounting box 3. A contact block 26 is fixedly connected to the inner wall of the conductive tube 10 away from the connecting line 11, and one side of the outer wall of the contact block 26 contacts one end of the outer wall of the conductive post 9. A plurality of insulating elastic clips 27 are fixedly connected to one end of the inner wall of the conductive tube 10, and the outer wall of the insulating elastic clips 27 contacts the outer wall of the conductive post 9.

[0029] During operation, a protective housing 2 is installed at the bottom of one side of the inner wall of the conversion body 1, and an installation box 3 is set on one side of the outer wall of the protective housing 2. Then, a gas storage chamber 17 filled with carbon dioxide gas is installed at one end of the top of the inner wall of the installation box 3, and the output end of the gas storage chamber 17 is connected to the gas guide pipe 16. An installation pipe 6 is set at the center of the inner cavity of the protective housing 2, and a connection terminal 7 is set on one side of the outer wall of the installation pipe 6. Then, the output end of the cable 8 is passed through the conversion body 1 and connected to the input end of the connection terminal 7, so that the current enters the connection terminal 7 along the cable 8, and enters the conductive pipe 10 set on the inner wall of the installation pipe 6 along the conductive post 9 set at the output end of the connection terminal 7. By setting several insulating elastic blocks 27 at one end of the inner wall of the conductive tube 10, the insulating elastic blocks 27 limit the conductive post 9, preventing the conductive post 9 from being misaligned and contacting the inner wall of the conductive tube 10. Since a contact block 26 is set at one end of the inner wall of the conductive tube 10, and one end of the contact block 26 is in contact with the conductive post 9, the current flows along the contact block 26 and is discharged through the connecting line 11 set at one end of the outer wall of the conductive tube 10. Since the output end of the connecting line 11 is connected to a voltage regulator 4 (which is the prior art and is a voltage regulator throughout), the current is transferred through the voltage regulator 4, and the current flows along the wire 5 set at the output end of the voltage regulator 4 into the conversion body 1.

[0030] It should be further explained that when voltage instability triggers the circuit breaker inside the conversion body 1, the protective housing 2 loses its power support. At this time, the electric telescopic rods 12 (which are existing technology and have a built-in mechanical self-resetting structure to release elastic potential energy and push the push rod to reset and extend) located on both ends of the outer wall of the connecting terminal 7 near the conductive post 9 extend, and the output end of the electric telescopic rod 12 pushes the conductive tube 10, causing the contact block 26 on the inner wall of the conductive tube 10 to move away from the conductive post 9, thereby completely detaching the conductive post 9 from the conductive tube 10. During this process, a sealing plate 13 is set at one end of the outer wall of the conductive tube 10. Since the outer wall of the sealing plate 13 is provided with a sealing ring 14, the conductive tube 10, the sealing plate 13, and the sealing ring 14 are pushed towards the mounting box 3 by the electric telescopic rod 12. Lateral movement is achieved by setting an elastic sealing tube 15 at one end of the outer wall of the sealing plate 13. During the movement of the sealing plate 13 and the sealing ring 14, the gas guide tube 16 connected to the output end of the gas storage chamber 17 is inserted into the elastic sealing tube 15. At this time, the built-in micro valve of the gas storage chamber 17 is activated, and the carbon dioxide gas filled in the gas storage chamber 17 is sprayed into the installation tube 6 along the gas guide tube 16, so that the carbon dioxide gas is quickly filled in the installation tube 6. This avoids the generation of an electric arc in the installation tube 6 when the conductive post 9 separates from the contact block 26. This further solves the problem that when the circuit breaker is triggered and the power is cut off due to voltage instability in the protection mechanism of the traditional power conversion box, the contact area decreases sharply at the moment the power terminals separate, resulting in a surge in the local electric field and a high arc temperature. This not only damages the internal device but also easily causes a fire.

[0031] Both ends of the inner wall of the mounting tube 6 are fixedly connected to support frames 18, and the inner wall of the support frame 18 is rotatably connected to a linkage rod 19. One end of the outer wall of the linkage rod 19 is fixedly connected to a push plate 20, and one side of the outer wall of the push plate 20 contacts the outer wall of the conductive tube 10. The end of the outer wall of the linkage rod 19 away from the push plate 20 is fixedly connected to a locking block 21, and one end of the locking block 21 is engaged with the outer wall of the conductive post 9. The end of the outer wall of the linkage rod 19 near the push plate 20 is fixedly connected to a wire 22, and one end of the wire 22 is fixed... A conductive block 23 is connected, and the two ends of the outer wall of the conductive block 23 are fixedly connected to the inner wall of the mounting tube 6. A shunt wire 24 is fixedly connected to the middle of one side of the outer wall of the conductive block 23, and one end of the outer wall of the shunt wire 24 is slidably connected to the end of the inner cavity of the sealing plate 13 away from the sealing ring 14. A parallel connector 25 is fixedly connected to one end of the shunt wire 24, and the bottom of the parallel connector 25 is fixedly connected to the end of the inner wall of the mounting box 3 away from the gas storage chamber 17. The output end of the parallel connector 25 is plugged into the input end of the conversion body 1.

[0032] During operation, support frames 18 are installed at both ends of the inner wall of the installation pipe 6, and linkage rods 19 are installed on the inner walls of the support frames 18. When the electric telescopic rod 12 pushes the conductive pipe 10 to move, and the carbon dioxide in the gas storage chamber 17 enters the installation pipe 6 through the gas guide pipe 16, a push plate 20 is installed at one end of the outer wall of the linkage rod 19, and one side of the outer wall of the push plate 20 is released from the restriction of the installation pipe 6. Under the action of the spring-loaded device installed between the support frame 18 and the linkage rod 19, the outer wall of the linkage rod 19 is moved away from the locking block 21 at the end of the push plate 20 and contacts the outer wall of the conductive post 9. The current flows along the linkage rod along the locking block 21 that is in contact with the outer wall of the conductive post 9. 19 enters the wire 22 set at one end of its outer wall near the push plate 20. By setting a conductive block 23 at one end of the inner wall of the mounting tube 6, the current in the wires 22 at both ends enters the conductive block 23 and flows along the shunt wire 24 set in the middle of one side of the outer wall of the conductive block 23 into the parallel connector 25 (which belongs to the prior art) set at one end of the inner wall of the mounting box 3 away from the gas storage chamber 17. The current is then quickly fed into the backup power branch set in the conversion body 1 through the parallel connector 25. This further solves the problem that when a short circuit occurs in the circuit of the traditional power conversion box protection mechanism, the conversion box will often lose power, causing the equipment to lose power and suddenly stop.

[0033] The working principle of the protection mechanism of this power conversion box will be explained in detail below.

[0034] like Figures 1-6As shown, a protective housing 2 is installed at the bottom of one side of the inner wall of the conversion body 1, and an installation box 3 is set on one side of the outer wall of the protective housing 2. Then, a gas storage chamber 17 filled with carbon dioxide gas is installed at one end of the top of the inner wall of the installation box 3, and the output end of the gas storage chamber 17 is connected to the gas guide pipe 16. An installation pipe 6 is set at the center of the inner cavity of the protective housing 2, and a connection terminal 7 is set on one side of the outer wall of the installation pipe 6. Then, the output end of the cable 8 passes through the conversion body 1 and is connected to the input end of the connection terminal 7, so that the current enters the connection terminal 7 along the cable 8, and enters the conductive pipe 10 set on the inner wall of the installation pipe 6 along the conductive post 9 set at the output end of the connection terminal 7. Several insulating elastic blocks 2 are set at one end of the inner wall of the conductive pipe 10. 7. The insulating elastic locking block 27 is used to limit the conductive post 9, preventing misalignment, and makes contact with the inner wall of the conductive tube 10. Since a contact block 26 is provided at one end of the inner wall of the conductive tube 10, and one end of the contact block 26 is in contact with the conductive post 9, the current flows along the contact block 26 and is discharged through the connecting line 11 provided at one end of the outer wall of the conductive tube 10. Since the output end of the connecting line 11 is connected to a voltage regulator 4 (which is existing technology and is a voltage stabilizer throughout), the voltage regulator 4 transfers the current, allowing the current to enter the conversion body 1 through the wire 5 provided at the output end of the voltage regulator 4. When the voltage is unstable and the circuit breaker provided in the conversion body 1 is triggered, the protective housing 2 loses power support. At this time, the circuit breaker provided outside the connecting terminal 7... The electric telescopic rods 12 (which are existing technology and have a built-in mechanical self-resetting structure to release elastic potential energy and push the push rod to reset and extend) extend near the conductive post 9 on both ends of the wall, and the output end of the electric telescopic rods 12 pushes the conductive tube 10, and the contact block 26 on the inner wall of the conductive tube 10 moves away from the conductive post 9, so that the conductive post 9 is completely separated from the conductive tube 10. During this period, a sealing plate 13 is set at one end of the outer wall of the conductive tube 10. Since the outer wall of the sealing plate 13 is provided with a sealing ring 14, the conductive tube 10, the sealing plate 13, and the sealing ring 14 move towards the mounting box 3 under the push of the electric telescopic rods 12. An elastic sealing tube 15 is set at one end of the outer wall of the sealing plate 13, and During the movement of the sealing plate 13 and the sealing ring 14, the gas guide pipe 16 connected to the output end of the gas storage chamber 17 is inserted into the elastic sealing pipe 15. At this time, the built-in micro valve of the gas storage chamber 17 is activated, and the carbon dioxide gas filled in the gas storage chamber 17 is sprayed into the installation pipe 6 along the gas guide pipe 16, so that the carbon dioxide gas is quickly filled in the installation pipe 6. This prevents the generation of an electric arc in the installation pipe 6 when the conductive post 9 separates from the contact block 26. This further solves the problem that when the protection mechanism of the traditional power conversion box is used, the contact area decreases sharply when the power terminals separate due to voltage instability, resulting in a surge in the local electric field and a high arc temperature. This not only damages the internal device but also easily causes a fire.

[0035] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A protection mechanism for a power conversion box, comprising a conversion body (1), characterized in that: A protective shell (2) is fixedly connected to the bottom of one side of the inner wall of the conversion body (1), and a mounting box (3) is fixedly connected to one side of the outer wall of the protective shell (2). A protective component is provided on the inner wall of the protective shell (2). A voltage regulator (4) is fixedly connected to the center of one side of the outer wall of the mounting box (3), and a wire (5) is inserted into one side of the outer wall of the voltage regulator (4). One end of the wire (5) is inserted into the input end of the conversion body (1). The protective assembly includes an installation tube (6) fixedly connected to the center of the inner cavity of the protective housing (2), and a connection terminal (7) fixedly connected to one side of the outer wall of the installation tube (6). A cable (8) is inserted into the input end of the connection terminal (7). A conductive post (9) is fixedly connected to the output end of the connection terminal (7). A conductive tube (10) is slidably connected to the outer wall of the conductive post (9). The outer wall of the conductive tube (10) is slidably connected to the inner wall of the installation tube (6). A connecting wire (11) is fixedly connected to one end of the outer wall of the conductive tube (10), and one end of the connecting wire (11) is fixedly connected to the end of the outer wall of the voltage regulator (4) away from the wire (5).

2. The protection mechanism for a power conversion box according to claim 1, characterized in that: Both ends of the outer wall of the connecting terminal (7) near the conductive post (9) are fixedly connected to an electric telescopic rod (12), and the output end of the electric telescopic rod (12) is fixedly connected to both ends of the outer wall of the conductive tube (10). One end of the outer wall of the conductive tube (10) is fixedly connected to a sealing plate (13), and the outer wall of the sealing plate (13) is fixedly connected to a sealing ring (14), and the outer wall of the sealing ring (14) is slidably connected to the inner wall of the mounting tube (6).

3. The protection mechanism for a power conversion box according to claim 2, characterized in that: One end of the outer wall of the sealing plate (13) is fixedly connected to an elastic sealing tube (15), and an air guide tube (16) is inserted into the inner wall of the elastic sealing tube (15). One end of the air guide tube (16) is equipped with an air storage chamber (17), and the bottom of the air storage chamber (17) is fixedly connected to the bottom of one side of the inner wall of the mounting box (3).

4. The protection mechanism for a power conversion box according to claim 3, characterized in that: Both ends of the inner wall of the mounting tube (6) are fixedly connected to a support frame (18), and the inner wall of the support frame (18) is rotatably connected to a linkage rod (19). One end of the outer wall of the linkage rod (19) is fixedly connected to a push plate (20), and one side of the outer wall of the push plate (20) is in contact with the outer wall of the conductive tube (10).

5. The protection mechanism for a power conversion box according to claim 4, characterized in that: The outer wall of the linkage rod (19) away from the push plate (20) is fixedly connected to a locking block (21), and one end of the locking block (21) is engaged with the outer wall of the conductive post (9).

6. The protection mechanism for a power conversion box according to claim 5, characterized in that: The outer wall of the linkage rod (19) is fixedly connected to one end of the push plate (20) with an electric wire (22), and one end of the electric wire (22) is fixedly connected to a conductive block (23). The two ends of the outer wall of the conductive block (23) are fixedly connected to the inner wall of the mounting tube (6). A shunt wire (24) is fixedly connected to the middle of one side of the outer wall of the conductive block (23), and one end of the outer wall of the shunt wire (24) is slidably connected to the end of the inner cavity of the sealing plate (13) away from the sealing ring (14).

7. A protection mechanism for a power conversion box according to claim 6, characterized in that: One end of the shunt wire (24) is fixedly connected to a parallel connector (25), and the bottom of the parallel connector (25) is fixedly connected to the end of the inner wall of the mounting box (3) away from the gas storage chamber (17), while the output end of the parallel connector (25) is plugged into the input end of the conversion body (1).

8. A protection mechanism for a power conversion box according to claim 7, characterized in that: A contact block (26) is fixedly connected to the inner wall of the conductive tube (10) away from the connecting line (11), and one side of the outer wall of the contact block (26) is in contact with one end of the outer wall of the conductive post (9). A plurality of insulating elastic blocks (27) are fixedly connected to one end of the inner wall of the conductive tube (10), and the outer wall of the insulating elastic blocks (27) is in contact with the outer wall of the conductive post (9).

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