Explosion-proof piezoresistor

Abstract

The utility model relates to the technical field of piezoresistor explosion prevention, and provides an explosion-proof piezoresistor, which comprises a first shell and a second shell, the upper surface of the first shell is fixedly connected with a plurality of through holes arranged at equal intervals, the inner cavities of the plurality of through holes are provided with rubber plugs, the inner cavity of each rubber plug is provided with a vent hole, and the vent hole is communicated with the first shell. L-shaped frames are symmetrically and fixedly connected to the outer side wall of the first shell, positioning blocks are fixedly connected to the ends of the two L-shaped frames, the first shell and the second shell are fixedly connected through a connecting assembly, the connecting assembly comprises connecting blocks, and the connecting blocks are symmetrically and fixedly connected to the outer side wall of the second shell. According to the utility model, the through hole, the rubber plug and the vent hole are matched, the diameter of the vent hole is gradually reduced from inside to outside, and the vent hole is communicated with the outside after being closed up for a certain distance, so that the explosion of the shell caused by gas generated in the shell due to high temperature is effectively prevented, and the overall safety of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of varistor explosion protection, in particular to an explosion-proof varistor. Background Art

[0002] A varistor refers to a voltage-limiting type component that is sensitive to voltage changes. Its characteristics are: at a specified temperature, when the voltage exceeds a certain critical value, its resistance value will decrease sharply, and the current passing through it will increase sharply. The voltage and current do not show a linear relationship. Therefore, the varistor is also called a non-linear rheostat.

[0003] For example, the publicly disclosed patent with the publication number CN219642611U discloses an explosion-proof varistor, which includes: a first mounting plate and a second mounting plate. The middle parts of the first mounting plate and the second mounting plate are respectively provided with a first clamping groove and a second clamping groove. A first clamping plate and a second clamping plate are respectively installed in the middle parts of the first clamping groove and the second clamping groove. Positioning holes are provided at the four corners of the first mounting plate, and positioning rods are installed at the four corners of the second mounting plate. Through the above structure, by using the mutual cooperation of the first clamping plate, the second clamping plate, the first mounting plate and the second mounting plate, a double protection effect can be achieved on the varistor.

[0004] However, in the prior art, with the increase in temperature, the low-resistance linearization phenomenon of the varistor will gradually intensify, which means that the linear relationship between its resistance value and voltage change becomes less obvious, thus affecting its normal operation. In a high-temperature environment, the leakage current of the varistor will increase, and these leakage currents may concentrate and flow into the weak points of the resistor, further increasing the risk of its damage, thereby affecting the safety of the device. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that in the prior art, in a high-temperature environment, the leakage current of the varistor will increase, and these leakage currents may concentrate and flow into the weak points of the resistor, further increasing the risk of its damage.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: an explosion-proof varistor, including a first outer shell and a second outer shell. A plurality of equally spaced through holes are fixedly connected to the upper surface of the first outer shell. Rubber plugs are arranged in the inner cavities of the plurality of through holes. Vent holes are provided in the inner cavities of each rubber plug. The shape of the vent holes gradually decreases from the inside to the outside. L-shaped frames are symmetrically and fixedly connected to the outer side wall of the first outer shell. Positioning blocks are fixedly connected to the ends of the two L-shaped frames. The first outer shell and the second outer shell are fixedly connected to each other through a connecting component.

[0007] As a preferred embodiment, the connecting component includes a connecting block, the connecting block is symmetrically and fixedly connected to the outer side wall of the second housing, and connecting cavities are formed at the centers of the upper surfaces of the two connecting blocks.

[0008] As a preferred embodiment, limiting grooves are symmetrically formed on both sides of the upper surfaces of the two connecting blocks, guide rods are fixedly connected to the inner walls of each limiting groove, and moving blocks are slidably connected to the surfaces of the guide rods.

[0009] As a preferred embodiment, an inclined plate is fixedly connected to the upper surface of the moving block, a push-pull block is fixedly connected to the outer side wall of each inclined plate, one side of the moving block is fixedly connected to the inner wall of the limiting groove through a return spring, and the connecting cavity is fitted with a positioning block.

[0010] As a preferred embodiment, a plurality of shock-absorbing springs arranged at equal intervals are provided on one side of the upper surface of the second housing, and one end of each shock-absorbing spring is fixedly connected through a placing plate.

[0011] As a preferred embodiment, second sliding grooves are symmetrically formed on the other side of the upper surface of the second housing, the inner bottom wall of the second sliding groove is fixedly connected to a second abutting block through a second extrusion spring, and the second sliding groove is slidably connected to the second abutting block.

[0012] As a preferred embodiment, first sliding grooves are symmetrically formed on one side of the lower surface of the first housing, the inner top wall of the first sliding groove is fixedly connected to a first abutting block through a first extrusion spring, and the first abutting block is slidably connected to the first sliding groove.

[0013] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0014] 1. By means of the cooperation of the through hole, the rubber plug and the ventilation hole, the diameter of the ventilation hole gradually decreases from the inside to the outside and converges for a certain distance before communicating with the outside, effectively preventing the housing from bursting caused by the generation of gas inside the housing due to high temperature, and improving the overall safety of the device.

[0015] 2. By providing a connecting component to facilitate quick disassembly of the device for subsequent maintenance and repair. During disassembly, pull the push-pull block outward, the push-pull block drives the moving block to slide in the guide rod through the inclined plate and compresses the return spring. At this time, remove the positioning block from the connecting cavity. During installation, only need to press down the positioning block, and the positioning block exerts a lateral force on the inclined plate. The overall structure is simple, the disassembly and assembly are convenient, and it is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an explosion-proof varistor provided by the present utility model;

[0017] Figure 2 Schematic diagram of the structure at the vent hole of an explosion-proof varistor provided by the present utility model;

[0018] Figure 3 Schematic diagram of the structure at the connection assembly of an explosion-proof varistor provided by the present utility model;

[0019] Figure 4 An explosion-proof varistor provided by the present utility model Figure 3 Enlarged schematic diagram of the structure at position A in

[0020] Legend description:

[0021] 1. First outer shell; 2. Second outer shell; 3. Through hole; 4. Rubber plug; 5. Vent hole; 6. L-shaped frame; 7. Positioning block; 8. First chute; 9. First compression spring; 10. First grinding block; 11. Shock-absorbing spring; 12. Placing board; 13. Second chute; 14. Second compression spring; 15. Second grinding block; 16. Connecting block; 17. Connecting cavity; 18. Guide rod; 19. Moving block; 20. Inclined plate; 21. Push-pull block; 22. Return spring. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1 - 4 , the present utility model provides a technical solution: an explosion-proof varistor, including a first outer shell 1 and a second outer shell 2. A plurality of through holes 3 arranged at equal intervals are fixedly connected to the upper surface of the first outer shell 1. Rubber plugs 4 are arranged in the inner cavities of the plurality of through holes 3. Vent holes 5 are opened in the inner cavities of each rubber plug 4. The shape of the vent holes 5 gradually decreases from the inside to the outside. Symmetrically fixed to the outer side wall of the first outer shell 1 are L-shaped frames 6. Positioning blocks 7 are fixedly connected to the ends of the two L-shaped frames 6. The first outer shell 1 and the second outer shell 2 are fixedly connected through a connection assembly. In the manner of the cooperation of the through holes 3, the rubber plugs 4 and the vent holes 5, the diameter of the vent holes 5 gradually decreases from the inside to the outside and converges for a certain distance before communicating with the outside, effectively preventing the explosion of the outer shell caused by the generation of gas in the outer shell due to high temperature, and improving the overall safety of the device.

[0024] As Figures 1 - 4As shown in the figure, the connecting component includes a connecting block 16. The connecting block 16 is symmetrically and fixedly connected to the outer side wall of the second housing 2. Connecting cavities 17 are provided at the centers of the upper surfaces of the two connecting blocks 16. Limiting grooves are symmetrically provided on both sides of the upper surfaces of the two connecting blocks 16. Guide rods 18 are fixedly connected to the inner walls of each limiting groove. A moving block 19 is slidably connected to the surface of the guide rod 18. An inclined plate 20 is fixedly connected to the upper surface of the moving block 19. Push-pull blocks 21 are fixedly connected to the outer side walls of each inclined plate 20. One side of the moving block 19 is fixedly connected to the inner wall of the limiting groove through a return spring 22. And the connecting cavity 17 is fitted with the positioning block 7. During disassembly, the push-pull block 21 is pulled outward. The push-pull block 21 drives the moving block 19 to slide in the guide rod 18 and compress the return spring 22 through the inclined plate 20. At this time, the positioning block 7 is removed from the connecting cavity 17. During installation, only the positioning block 7 needs to be pressed down. The positioning block 7 exerts a lateral force on the inclined plate 20. The overall structure is simple, the disassembly and assembly are convenient, it is suitable for large-scale promotion, and the practicability and safety of the device are further improved.

[0025] As Figures 1 - 4 shown, a number of shock-absorbing springs 11 arranged at equal intervals are provided on one side of the upper surface of the second housing 2. One end of each shock-absorbing spring 11 is fixedly connected through a placement plate 12. Due to the design of the cooperation between the shock-absorbing spring 11 and the placement plate 12, the wear of the varistor is effectively avoided, and the service life of the device is prolonged.

[0026] As Figures 1 - 4 shown, second sliding grooves 13 are symmetrically provided on the other side of the upper surface of the second housing 2. The inner bottom wall of the second sliding groove 13 is fixedly connected to a second abutting block 15 through a second pressing spring 14. And the second sliding groove 13 is slidably connected to the second abutting block 15. First sliding grooves 8 are symmetrically provided on one side of the lower surface of the first housing 1. The inner top wall of the first sliding groove 8 is fixedly connected to a first abutting block 10 through a first pressing spring 9. And the first abutting block 10 is slidably connected to the first sliding groove 8. The first abutting block 10 slides in the first sliding groove 8 and compresses the first pressing spring 9. The second abutting block 15 slides in the second sliding groove 13 and compresses the second pressing spring 14, so as to stabilize the end of the varistor, ensure the stable operation of the varistor, further ensure the stable operation of the varistor, and is suitable for large-scale promotion.

[0027] Working principle: When in use, first place the varistor on the surface of the storage plate 12, with the end of the varistor on the surface of the second grinding block 15. At this time, assemble the first outer shell 1 and the second outer shell 2. Place the positioning block 7 in the connection cavity 17 and continuously press down. The positioning block 7 exerts a lateral force on the inclined plate 20, and the inclined plate 20 compresses the return spring 22 through the moving block 19. When the positioning block 7 is completely fitted with the connection cavity 17, the return spring 22 quickly rebounds to drive the push-pull block 21 to reset and limit the positioning block 7. Repeat the above steps during disassembly and assembly. The overall structure is simple, the disassembly and assembly are convenient, and it is suitable for large-scale promotion. While the first outer shell 1 and the second outer shell 2 are assembled to fix the varistor, the first grinding block 10 slides in the first chute 8 to compress the first compression spring 9, and the second grinding block 15 slides in the second chute 13 and compresses the second compression spring 14, thereby stabilizing the end of the varistor and ensuring the stable operation of the varistor. The diameter of the vent hole 5 gradually decreases from the inside to the outside and converges for a certain distance before communicating with the outside, effectively preventing the outer shell from bursting due to the gas generated inside the outer shell caused by high temperature, and improving the overall safety of the device.

[0028] The above are only the preferred embodiments of the present invention, and do not limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. An explosion-proof varistor, comprising a first housing (1) and a second housing (2), characterized in that: The upper surface of the first outer shell (1) is fixedly connected with a plurality of through holes (3) arranged at equal intervals. Rubber plugs (4) are arranged in the inner cavities of the plurality of through holes (3). Vent holes (5) are formed in the inner cavities of each of the rubber plugs (4). The shape of the vent holes (5) gradually decreases from inside to outside. The outer side wall of the first outer shell (1) is symmetrically and fixedly connected with L-shaped frames (6). Positioning blocks (7) are fixedly connected to the ends of the two L-shaped frames (6). The first outer shell (1) and the second outer shell (2) are fixedly connected to each other through a connecting component.

2. The explosion-proof varistor according to claim 1, wherein: The connecting component includes connecting blocks (16). The connecting blocks (16) are symmetrically and fixedly connected to the outer side wall of the second outer shell (2). Connecting cavities (17) are formed at the centers of the upper surfaces of the two connecting blocks (16).

3. An explosion-proof varistor according to claim 2, characterized in that: Limiting grooves are symmetrically formed on both sides of the upper surfaces of the two connecting blocks (16). Guide rods (18) are fixedly connected to the inner walls of each of the limiting grooves. Moving blocks (19) are slidably connected to the surfaces of the guide rods (18).

4. The explosion-proof varistor according to claim 3, wherein: The upper surface of the moving block (19) is fixedly connected with inclined plates (20). Push-pull blocks (21) are fixedly connected to the outer side walls of each of the inclined plates (20). One side of the moving block (19) is fixedly connected to the inner wall of the limiting groove through a return spring (22), and the connecting cavity (17) is fitted with the positioning block (7).

5. The explosion-proof varistor according to claim 4, wherein: A plurality of shock-absorbing springs (11) arranged at equal intervals are provided on one side of the upper surface of the second outer shell (2). One end of each of the shock-absorbing springs (11) is fixedly connected through a placing plate (12).

6. The explosion-proof varistor according to claim 1, characterized in that: On the other side of the upper surface of the second outer shell (2), second sliding grooves (13) are symmetrically formed. The inner bottom wall of the second sliding grooves (13) is fixedly connected to a second abutting block (15) through a second pressing spring (14), and the second sliding grooves (13) are slidably connected to the second abutting block (15).

7. An explosion-proof varistor according to claim 1, characterized in that: On one side of the lower surface of the first outer shell (1), first sliding grooves (8) are symmetrically formed. The inner top wall of the first sliding grooves (8) is fixedly connected to a first abutting block (10) through a first pressing spring (9), and the first abutting block (10) is slidably connected to the first sliding grooves (8).

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