A thin arc-extinguishing flame-resistant piezoresistor

Abstract

The utility model relates to a pressure sensitive resistor technical field especially thin arc extinguishing flame -retardant pressure sensitive resistor, including insulating casing, pressure sensitive resistor main part and pin, two the pin fixed connection is in the outer wall lower extreme of pressure sensitive resistor main part, pressure sensitive resistor main part fixedly placed in the inside of insulating casing, the inside of insulating casing is equipped with both sides even flame -retardant resistor structure. This thin arc extinguishing flame -retardant pressure sensitive resistor, the flame -retardant layer is equipped with one in the up and down, the flame -retardant layer adopts ultrathin mica piece to make, both sides mica piece will the pressure sensitive resistor main part in the middle clamped in the middle, the insulating particle layer also is equipped with the metal oxide filling of thin even, such both sides insulating particle layer will the flame -retardant layer to the pressure sensitive resistor main part both sides extrusion, therefore the thickness of pressure sensitive resistor main part both sides is more average, and both sides flame -retardant and mechanical performance also are more close, effectively in the guarantee thinness inconvenient case, reduce thin arc extinguishing flame -retardant pressure sensitive resistor explosion risk.

Description

Technical Field

[0001] This utility model relates to the field of varistor technology, specifically a thin arc-extinguishing and flame-retardant varistor. Background Technology

[0002] A varistor is a voltage-limiting element that is sensitive to voltage changes. Its characteristics are: at a specified temperature, when the voltage exceeds a certain critical value, its resistance will decrease sharply and the current through it will increase sharply. The voltage and current are not linearly related. Therefore, varistors are also called nonlinear rheostats.

[0003] For example, the authorized announcement number "CN201707986U" is named a thin arc-extinguishing and flame-retardant varistor. It has good stability and obvious arc-extinguishing and flame-retardant effects, while its height is greatly reduced compared to existing products, meeting the market demand for thin arc-extinguishing and flame-retardant varistors. However, existing thin arc-extinguishing and flame-retardant varistors use mica sheets for flame retardancy in order to minimize the thickness of the varistor. However, the mica sheet is only set on one side of the varistor, while the other side still uses flame-retardant filling particles. Although the thickness of the varistor is greatly reduced, the thickness of the two sides of the varistor is different. One side is a thinner mica sheet and insulating shell, while the other side is filled with insulating particles. Therefore, there is a difference in the flame-retardant performance on both sides of the varistor. When in use, the heat generated by the resistor will concentrate to one side, thereby increasing the possibility of the resistor exploding and burning.

[0004] Meanwhile, existing thin arc-extinguishing and flame-retardant varistors utilize the casing sealing layer to place some insulating particles on top of the thin arc-extinguishing and flame-retardant varistor. When the varistor suddenly explodes, the shock wave and energy generated by the explosion will push the insulating particles out like shotgun pellets, resulting in increased destructive power of the thin arc-extinguishing and flame-retardant varistor. Utility Model Content

[0005] The purpose of this invention is to solve the problems of uneven flame retardancy on both sides of existing thin arc-extinguishing and flame-retardant varistors and excessive explosive destructive force of varistors, and to propose a thin arc-extinguishing and flame-retardant varistor.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A thin arc-extinguishing and flame-retardant varistor is designed, comprising an insulating shell, a varistor body, and pins. Two pins are fixedly connected to the lower end of the outer wall of the varistor body. The varistor body is fixedly placed inside the insulating shell. The inner side of the insulating shell is provided with a uniform flame-retardant resistor structure on both sides, and the top of the outer wall of the insulating shell is provided with an explosive particulate barrier structure.

[0008] The uniform flame-retardant resistor structure includes partitions and positioning blocks. Multiple positioning blocks are movably connected to both ends of the inner side of the insulating shell. Flame-retardant layers are fixedly connected to the inner side of the multiple positioning blocks. Insulating particle layers are fixedly provided on the outer side of the two flame-retardant layers. Two partitions are fixedly connected to the outer side of the insulating particle layers.

[0009] The explosive particulate matter blocking structure includes welded blocks and welded points. Multiple welded points are fixedly connected to the top of the outer wall of the insulating shell. Welded blocks are fixedly connected to the outer side of the multiple welded points. Multiple welded blocks are directly and laterally connected to multiple crossbeams. Interception nets are fixedly connected to the inner side of the multiple crossbeams.

[0010] The inner side of the interception net is close to the outer wall of the partition, and the multiple welding points are equidistantly distributed along the outer circumference of the insulating shell.

[0011] The outer wall of the insulating housing is fixedly connected with wiring holes, and pins are movably sleeved on the inner side of the two wiring holes.

[0012] A ceramic pad is fixedly connected to the bottom of the insulating shell, and multiple heat dissipation grooves are fixedly opened at the bottom of the ceramic pad.

[0013] The present invention proposes a thin arc-extinguishing and flame-retardant varistor, the advantages of which are as follows: a partition is embedded in the top opening of the insulating shell, so that the partition can press down to fix the varistor body inside the insulating shell. A flame-retardant layer is provided on both the top and bottom, and the flame-retardant layer is made of ultra-thin mica sheet. The mica sheets on both sides sandwich the varistor body in the middle. The insulating particle layer is also filled with a uniform thickness of metal oxide. In this way, the insulating particle layers on both sides squeeze the flame-retardant layer to both sides of the varistor body. Therefore, the thickness of the varistor body on both sides is relatively uniform, and the flame-retardant and mechanical properties on both sides are also closer. This effectively reduces the explosion risk of the thin arc-extinguishing and flame-retardant varistor while ensuring the thinness.

[0014] The welding points are made of carbon steel and are round. The welding blocks are welded to the welding points after the varistor body is placed inside the insulating shell and the partition is embedded in the insulating shell. The crossbeams are staggered and intercept the outside of the partition under the fixation of the welding blocks. The inside of the interception net is close to the outer wall of the partition, and a layer of ultra-thin asbestos mesh is fixed to the inside of the crossbeams. In this way, the asbestos mesh has flame-retardant function. At the same time, in conjunction with the crossbeams tightened on the outside, when the varistor explodes, the fragments of the explosion can be intercepted by the mesh plate, reducing the destructive force of the explosion. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 for Figure 1 A frontal sectional view;

[0017] Figure 3 for Figure 1 A side sectional view;

[0018] Figure 4 for Figure 2 Enlarged sectional view of section A in the middle;

[0019] Figure 5 for Figure 2 Enlarged sectional view of section B in the middle;

[0020] Figure 6 for Figure 3 Enlarged sectional view of section C.

[0021] In the diagram: 1. Insulating shell, 2. Varistor body, 3. Pins, 4. Uniform flame-retardant resistor structure on both sides, 41. Partition, 42. Insulating particle layer, 43. Positioning block, 44. Flame-retardant layer, 5. Explosive particulate barrier structure, 51. Welding block, 52. Welding point, 53. Crossbeam, 54. Interception net, 6. Wiring hole, 71. Ceramic pad, 72. Heat dissipation groove. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Example 1:

[0024] Please see Figure 1-6 In this embodiment, a thin arc-extinguishing and flame-retardant varistor includes an insulating shell 1, a varistor body 2, and leads 3. Two leads 3 are fixedly connected to the lower end of the outer wall of the varistor body 2. The leads 3 are made of copper, which provides good conductivity. The varistor body 2 is fixedly placed inside the insulating shell 1. The insulating shell 1 is made of epoxy resin material, which provides good insulation, mechanical properties, and chemical stability. It can effectively protect the varistor from the influence of the external environment and ensure its stable operation. The inner side of the insulating shell 1 is provided with a uniform flame-retardant resistor structure 4 on both sides, and the top of the outer wall of the insulating shell 1 is provided with an explosive particulate matter blocking structure 5.

[0025] The uniformly flame-retardant resistor structure 4 includes a partition plate 41 and positioning blocks 43. Multiple positioning blocks 43 are movably connected to both ends of the interior of the insulating shell 1. The partition plate 41 is embedded at the top opening of the insulating shell 1, so that the partition plate 41 can press down to fix the varistor body 2 inside the insulating shell 1. Flame-retardant layers 44 are fixedly connected to the inner sides of the multiple positioning blocks 43. There is one flame-retardant layer 44 at both the top and bottom. The flame-retardant layer 44 is made of ultra-thin mica sheet. The mica sheets on both sides clamp the varistor body 2 in the middle. In the middle, an insulating particle layer 42 is fixedly provided on the outer side of the two flame-retardant layers 44. The insulating particle layer 42 is also filled with a uniformly thin metal oxide. In this way, the insulating particle layers 42 on both sides squeeze the flame-retardant layer 44 towards both sides of the varistor body 2. Therefore, the thickness on both sides of the varistor body 2 is relatively uniform, and the flame-retardant and mechanical properties on both sides are also closer. This effectively reduces the risk of explosion of the thin arc-extinguishing flame-retardant varistor while ensuring a reduction in thickness. The two partitions 41 are fixedly connected to the outer side of the insulating particle layer 42.

[0026] The explosive particulate matter containment structure 5 includes welding blocks 51 and welding points 52. Multiple welding points 52 are fixedly connected to the top of the outer wall of the insulating shell 1. The welding points 52 are made of carbon steel and are round. Welding blocks 51 are fixedly connected to the outer sides of the multiple welding points 52. The welding blocks 51 are welded to the welding points 52 after the varistor body 2 inside the insulating shell 1 is installed and the partition plate 41 is embedded in the insulating shell 1. Multiple crossbeams 53 are horizontally connected between the multiple welding blocks 51. The crossbeams 53 are welded... The connecting block 51 is fixed and interlaced on the outside of the partition 41. Multiple crossbeams 53 are fixedly connected to the inner side of the interception net 54. The inner side of the interception net 54 is close to the outer wall of the partition 41. The inner side of the crossbeam 53 is fixed with an ultra-thin asbestos mesh. In this way, the asbestos mesh has flame-retardant function. At the same time, in conjunction with the crossbeam 53 tightened on the outside, when the varistor explodes, the fragments of the explosion can be intercepted by the mesh plate, reducing the destructive force of the explosion. Multiple welding points 52 are equidistantly distributed along the outer circumference of the insulating shell 1.

[0027] The outer wall of the insulating housing 1 is fixedly connected with wiring holes 6. The wiring holes 6 are reserved holes, which can facilitate the two pins 3 of the varistor to pass through the wiring holes 6 and be soldered to the circuit board. The pins 3 are movably sleeved on the inner side of the two wiring holes 6.

[0028] A ceramic pad 71 is fixedly connected to the bottom of the insulating shell 1. The ceramic pad 71 is made of artificial PCD ceramic material. PCD ceramic has good thermal conductivity, so the ceramic pad 71 can accelerate the heat dissipation of the varistor. Multiple heat dissipation grooves 72 are fixedly opened at the bottom of the ceramic pad 71. The heat dissipation grooves 72 are multiple staggered grooves and long strip supports, which increase the contact area between the bottom of the ceramic pad 71 and the outside, thereby achieving the effect of increasing heat dissipation.

[0029] Working principle:

[0030] Thin arc-extinguishing and flame-retardant varistors are connected to circuit boards or circuit devices by soldering through two pins at the bottom. They are often used to construct overvoltage protection circuits, noise reduction circuits, spark suppression circuits, and lightning protection circuits. The thin arc-extinguishing and flame-retardant varistor is designed to be thin enough to fit into some ultra-thin electronic products. It is equipped with a mica layer and insulating particles to play a flame-retardant role. Moreover, the varistor uses the internal zinc oxide grain and grain boundary layer microstructure to conduct under high voltage. Through multi-stage series or parallel varistor units, energy is dispersed and absorbed, reducing the energy basis of arc generation, thereby achieving the arc extinguishing effect.

[0031] Main components of a thin arc-extinguishing and flame-retardant varistor:

[0032] Two pins 3 are fixedly connected to the lower end of the outer wall of the varistor body 2. The pins 3 are made of copper, which has good conductivity. The insulating shell 1 is made of epoxy resin material. The insulating shell 1 can provide good insulation, mechanical properties and chemical stability, and can effectively protect the varistor from the influence of the external environment and ensure its stable operation.

[0033] Thin arc-extinguishing and flame-retardant varistors with uniformly arranged flame-retardant structures:

[0034] The partition 41 is embedded in the top opening of the insulating shell 1, so that the partition 41 can press down to fix the varistor body 2 inside the insulating shell 1. There is a flame retardant layer 44 on both the top and bottom. The flame retardant layer 44 is made of ultra-thin mica sheets. The mica sheets on both sides sandwich the varistor body 2 in the middle. The insulating particle layer 42 is also filled with metal oxide of uniform thickness. In this way, the insulating particle layers 42 on both sides squeeze the flame retardant layer 44 to both sides of the varistor body 2. Therefore, the thickness of both sides of the varistor body 2 is relatively uniform, and the flame retardant and mechanical properties on both sides are also closer. This effectively reduces the risk of explosion of thin arc-extinguishing flame retardant varistor while ensuring thinness.

[0035] Thin arc-extinguishing and flame-retardant varistor structure for intercepting explosion fragments:

[0036] Welding point 52 is made of carbon steel. Welding block 51 can be welded to welding point 52 after the varistor body 2 is placed inside the insulating shell 1 and the partition 41 is embedded in the insulating shell 1. The crossbeam 53 is staggered and intercepted on the outside of the partition 41 under the fixation of welding block 51. The inner side of the interception net 54 is close to the outer wall of the partition 41. The inner side of the crossbeam 53 is fixed with an ultra-thin asbestos net. In this way, the asbestos net has flame-retardant function. At the same time, with the crossbeam 53 tightened on the outside, when the varistor explodes, the explosion fragments can be intercepted by the mesh plate, reducing the destructive force of the explosion.

[0037] Wiring and heat dissipation structure of thin arc-extinguishing and flame-retardant varistors:

[0038] Wiring hole 6 is a reserved hole, which allows the two leads 3 of the varistor to pass through wiring hole 6 and be soldered to the circuit board.

[0039] The ceramic pad 71 is made of artificial PCD fired ceramic material. PCD ceramic has good thermal conductivity, so the ceramic pad 71 can accelerate the heat dissipation of the varistor. The heat dissipation groove 72 consists of multiple staggered grooves and long strip supports, which increases the contact area between the lower end of the ceramic pad 71 and the outside world, thereby achieving the effect of increasing heat dissipation.

[0040] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A thin arc-extinguishing and flame-retardant varistor, comprising an insulating housing (1), a varistor body (2), and leads (3), wherein two leads (3) are fixedly connected to the lower end of the outer wall of the varistor body (2), characterized in that: The varistor body (2) is fixedly placed inside the insulating shell (1). The inner side of the insulating shell (1) is provided with a two-sided uniform flame-retardant resistor structure (4). The top of the outer wall of the insulating shell (1) is provided with an explosive particulate blocking structure (5). The two-sided uniform flame-retardant resistor structure (4) includes a partition (41) and a positioning block (43). Multiple positioning blocks (43) are movably connected to the two ends inside the insulating shell (1). A flame-retardant layer (44) is fixedly connected to the inner side of multiple positioning blocks (43). An insulating particle layer (42) is fixedly provided on the outer side of two flame-retardant layers (44). Two partitions (41) are fixedly connected to the outer side of the insulating particle layer (42).

2. The thin arc-extinguishing and flame-retardant varistor according to claim 1, characterized in that: The explosive particulate barrier structure (5) includes a welding block (51) and welding points (52). Multiple welding points (52) are fixedly connected to the top of the outer wall of the insulating shell (1). Welding blocks (51) are fixedly connected to the outer side of multiple welding points (52). Multiple crossbeams (53) are horizontally connected between multiple welding blocks (51). An interception net (54) is fixedly connected to the inner side of multiple crossbeams (53).

3. The thin arc-extinguishing and flame-retardant varistor according to claim 2, characterized in that: The inner side of the interception net (54) is close to the outer wall of the partition (41), and the plurality of welding points (52) are equidistantly distributed along the outer circumference of the insulating shell (1).

4. The thin arc-extinguishing and flame-retardant varistor according to claim 1, characterized in that: The outer wall of the insulating housing (1) is fixedly connected with wiring holes (6), and pins (3) are movably sleeved on the inner side of the two wiring holes (6).

5. The thin arc-extinguishing and flame-retardant varistor according to claim 1, characterized in that: A ceramic pad (71) is fixedly connected to the lowest end of the insulating shell (1), and a plurality of heat dissipation grooves (72) are fixedly opened at the lower end of the ceramic pad (71).

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