Thin arc-extinguishing flame-retardant piezoresistor

Abstract

The utility model discloses a thin arc-extinguishing flame-retardant piezoresistor which comprises an insulating shell, a shell sealing cover plate and a piezoresistor body, the top of the insulating shell is open, a mica sheet is laid at the inner bottom of the insulating shell, the bottom surface of the piezoresistor body is attached to the mica sheet, and the shell sealing cover plate is arranged on the top of the piezoresistor body. Pins of the piezoresistor body penetrate through the mica sheet and then penetrate out of the bottom of the insulating shell, the shell sealing cover plate is fixedly connected to the top of the insulating shell, and the bottom of the shell sealing cover plate is provided with an arc extinguishing grid used for extinguishing electric arcs generated when the piezoresistor body is broken down. The arc extinguishing grid compresses the piezoresistor body in the insulating shell; according to the utility model, the mica sheet is matched with the arc extinguishing grid arranged at the bottom of the sealing cover plate of the shell and the limiting groove arranged at the bottom of the arc extinguishing grid, so that the piezoresistor body is wrapped in a space enclosed by the mica sheet and the limiting groove, and the piezoresistor has the effect of accurate and quick assembly process.

Description

Technical Field

[0001] The utility model relates to the technical field of varistors, and particularly relates to a thin arc-extinguishing and flame-retardant varistor. Background Art

[0002] Chinese Patent with publication number CN102237161B discloses a thin arc-extinguishing and flame-retardant varistor, which has an insulating housing and a varistor body encapsulated in the insulating housing. There is a gap between the inner wall of the insulating housing and the varistor body to form a powder accommodating cavity. Two lead electrodes pass through the housing sealing layer and extend outside the insulating housing. At least one side of the inner wall of the insulating housing and the built-in varistor body are isolated by an insulating, non-combustible and high-temperature-resistant gasket, which occupies the powder accommodating cavity on this side. The cavity between the other surfaces of the insulating housing and the outer wall of the varistor body is filled with non-combustible insulating particles. The electrodes are bent at a 90-degree angle in the powder accommodating cavity and then pass through the housing sealing layer and extend outside the insulating housing.

[0003] The above varistor can effectively prevent the high-temperature arc generated by the short-circuit breakdown of the built-in varistor body from eroding the insulating housing.

[0004] However, in the process of production and assembly, it is necessary to add an insulating, non-combustible and high-temperature-resistant gasket in the insulating housing, then place the varistor body in the insulating housing, then fill the insulating housing with non-combustible insulating particles, and then cover the housing sealing layer on the insulating housing. The whole assembly process is rather cumbersome and inefficient. At the same time, there is also a problem that when filling the non-combustible insulating particles, the varistor body may shift in the insulating housing, resulting in the housing sealing layer being unable to pass through the pins of the varistor body to cover the insulating housing. Moreover, the above varistor seals the whole varistor body in the insulating housing, and cannot effectively dissipate the heat generated during the operation of the varistor body.

[0005] Therefore, a thin arc-extinguishing and flame-retardant varistor is proposed. Content of the Utility Model

[0006] The purpose of the utility model is to provide a thin arc-extinguishing and flame-retardant varistor, so as to solve or at least alleviate one or more of the above problems and other problems existing in the prior art.

[0007] To achieve the above purpose, the main technical solutions adopted by the utility model include:

[0008] Thin arc extinguishing and flame retardant varistor, including an insulating housing, a housing sealing cover plate and a varistor body. The top of the insulating housing is open. A mica sheet is laid on the inner bottom of the insulating housing. The bottom surface of the varistor body is adhered to the mica sheet. The pins of the varistor body penetrate through the mica sheet and then pass out from the bottom of the insulating housing. The housing sealing cover plate is fixedly connected to the top of the insulating housing. An arc extinguishing grid for extinguishing the arc generated when the varistor body is broken down is provided at the bottom of the housing sealing cover plate. The arc extinguishing grid presses the varistor body tightly in the insulating housing.

[0009] In the thin arc extinguishing and flame retardant varistor according to the present invention, a through hole is provided on the mica sheet, and an extraction hole is provided at one end of the insulating housing. The through hole is connected to the extraction hole.

[0010] In the thin arc extinguishing and flame retardant varistor according to the present invention, the arc extinguishing grid includes longitudinal arc extinguishing partitions. There are multiple longitudinal arc extinguishing partitions, and the multiple longitudinal arc extinguishing partitions are equidistantly distributed at the bottom of the insulating housing.

[0011] In the thin arc extinguishing and flame retardant varistor according to the present invention, the arc extinguishing grid further includes multiple transverse arc extinguishing partitions, and the multiple transverse arc extinguishing partitions are equidistantly distributed at the bottom of the insulating housing.

[0012] In the thin arc extinguishing and flame retardant varistor according to the present invention, a limiting groove is provided at the bottom of the arc extinguishing grid, and the varistor body is limited in the limiting groove.

[0013] In the thin arc extinguishing and flame retardant varistor according to the present invention, the arc extinguishing grid and the housing sealing cover plate are integrally formed by injection molding.

[0014] In the thin arc extinguishing and flame retardant varistor according to the present invention, a fireproof ceramic coating is sprayed on the surface of the arc extinguishing grid and the surface of the housing sealing cover plate.

[0015] In the thin arc extinguishing and flame retardant varistor according to the present invention, a plurality of ventilation holes are provided at the top of the housing sealing cover plate.

[0016] The present invention has at least the following beneficial effects:

[0017] The utility model makes the varistor body be wrapped in the space surrounded by mica sheets and the limiting groove by arranging mica sheets in cooperation with the arc extinguishing grid arranged at the bottom of the shell sealing cover plate and the limiting groove opened at the bottom of the arc extinguishing grid. When the varistor body is broken down, the generated arc can be effectively extinguished, and it has excellent arc extinguishing and flame retardant performance. Moreover, during assembly, the mica sheets are placed in the insulating shell, then the varistor body is installed in the insulating shell, and then the shell sealing cover plate is covered on the top of the insulating shell, and the assembly process is accurate and fast;

[0018] By arranging the ventilation holes, the heat generated during the operation of the varistor body can be dissipated, and when the varistor body is broken down, the internal pressure of the insulating shell can be relieved. Description of the Drawings

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0020] Figure 1 It is a schematic structural diagram of the thin arc extinguishing and flame retardant varistor of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of another perspective of the thin arc extinguishing and flame retardant varistor of the present utility model;

[0022] Figure 3 It is an exploded structural diagram of the thin arc extinguishing and flame retardant varistor of the present utility model;

[0023] Figure 4 It is a schematic structural diagram of the shell sealing cover plate of the present utility model;

[0024] Figure 5 It is a schematic cross-sectional structural diagram of the thin arc extinguishing and flame retardant varistor of the present utility model.

[0025] Explanation of the Reference Numerals in the Drawings:

[0026] 1. Insulating shell; 101. Lead-out hole; 2. Shell sealing cover plate; 201. Longitudinal arc extinguishing partition; 202. Transverse arc extinguishing partition; 203. Ventilation hole; 204. Limiting groove; 3. Varistor body; 301. Pin; 4. Mica sheet; 401. Through hole. Detailed Embodiment

[0027] The following will detail the implementation manners of the present application in conjunction with the drawings and embodiments, so as to fully understand how the present application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0028] Please refer to Figures 1 to 5 As shown, this embodiment provides a thin arc-extinguishing and flame-retardant varistor. Its overall thickness is 5 - 8 mm, which is a thin structure. It includes an insulating housing 1, a housing sealing cover plate 2, and a varistor body 3. The top of the insulating housing 1 is open. A mica sheet 4 is laid on the inner bottom of the insulating housing 1. The bottom surface of the varistor body 3 is fitted on the mica sheet 4. A through hole 401 is opened on the mica sheet 4. An extraction hole 101 is opened at one end of the insulating housing 1. The through hole 401 is connected to the extraction hole 101. The pin 301 of the varistor body 3 passes through the through hole 401 on the mica sheet 4 and then passes out from the extraction hole 101 on the insulating housing 1. The housing sealing cover plate 2 is fixedly connected to the top of the insulating housing 1. An arc-extinguishing grid for extinguishing the arc generated when the varistor body 3 is broken down is provided at the bottom of the housing sealing cover plate 2. The arc-extinguishing grid presses the varistor body 3 tightly in the insulating housing 1. In this embodiment, the arc-extinguishing grid includes a plurality of longitudinal arc-extinguishing partitions 201 and a plurality of transverse arc-extinguishing partitions 202. The plurality of longitudinal arc-extinguishing partitions 201 and the plurality of transverse arc-extinguishing partitions 202 are evenly distributed at the bottom of the insulating housing 1. A limiting groove 204 is opened at the bottom of the arc-extinguishing grid. The varistor body 3 is limited in the limiting groove 204.

[0029] By adopting the above technical solution, through the mica sheet 4 provided in cooperation with the arc-extinguishing grid provided at the bottom of the housing sealing cover plate 2 and the limiting groove 204 opened at the bottom of the arc-extinguishing grid, the varistor body 3 is wrapped in the space surrounded by the mica sheet 4 and the limiting groove 204. When the varistor body 3 is broken down, the arc generated during breakdown can be effectively extinguished, having excellent arc-extinguishing and flame-retardant performance. Moreover, during assembly, the mica sheet 4 is placed in the insulating housing 1, then the varistor body 3 is installed in the insulating housing 1, and then the housing sealing cover plate 2 is fixed to the top of the insulating housing 1, so that the varistor body 3 is wrapped in the space surrounded by the mica sheet 4 and the limiting groove 204, and the assembly process is accurate and fast.

[0030] In this embodiment, the arc-extinguishing grid and the housing sealing cover plate 2 are integrally formed by injection molding, and its material can be made of BMC molding compound with high temperature resistance and good insulation performance.

[0031] In order to further improve the high temperature resistance of the housing sealing cover plate 2 and the arc-extinguishing grid, in some embodiments, a fireproof ceramic coating is sprayed on the surface of the arc-extinguishing grid and the surface of the housing sealing cover plate 2.

[0032] A plurality of ventilation holes 203 are opened at the top of the housing sealing cover plate 2. Through the ventilation holes 203 provided, the heat generated during the operation of the varistor body 3 can be dissipated, and when the varistor body 3 is broken down, the internal pressure of the insulating housing 1 can be relieved.

[0033] The above description shows and describes several preferred embodiments of the present utility model. However, as previously mentioned, it should be understood that the present utility model is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in the relevant field. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. Thin arc-extinguishing flame-retardant varistor, characterized by: The invention comprises an insulating shell (1), a shell sealing cover plate (2) and a varistor body (3); the top of the insulating shell (1) is open, the inner bottom of the insulating shell (1) is paved with a mica sheet (4), the bottom surface of the varistor body (3) is attached to the mica sheet (4), the pins (301) of the varistor body (3) pass through the mica sheet (4) and then pass out from the bottom of the insulating shell (1); the shell sealing cover plate (2) is fixedly connected to the top of the insulating shell (1), and the bottom of the shell sealing cover plate (2) is provided with an arc extinguishing grid for extinguishing the arc generated when the varistor body (3) is broken down, and the arc extinguishing grid presses the varistor body (3) tightly into the insulating shell (1).

2. The thin arc-extinguishing flame-retardant varistor according to claim 1, characterized in that: A through hole (401) is provided on the mica sheet (4), an outlet hole (101) is provided at one end of the insulating shell (1), and the through hole (401) is connected to the outlet hole (101).

3. The thin arc-extinguishing flame-retardant varistor according to claim 2, characterized in that: The arc extinguishing grid comprises a longitudinal arc extinguishing chute (201), a plurality of the longitudinal arc extinguishing chute (201) are provided, and the plurality of longitudinal arc extinguishing chute (201) are equidistantly distributed on the bottom of the insulating housing (1).

4. The thin arc-extinguishing flame-retardant varistor according to claim 3, characterized in that: The arc extinguishing grid further comprises a plurality of transverse arc extinguishing chute plates (202), wherein the plurality of transverse arc extinguishing chute plates (202) are distributed at equal intervals on the bottom of the insulating housing (1).

5. The thin arc-extinguishing flame-retardant varistor according to claim 4, characterized in that: A limiting groove (204) is provided at the bottom of the arc extinguishing grid, and the varistor body (3) is limited in the limiting groove (204).

6. The thin arc-extinguishing flame-retardant varistor according to claim 5, characterized in that: The arc extinguishing grid and the housing sealing cover plate (2) are integrally formed by injection molding.

7. The thin arc-extinguishing flame-retardant varistor according to claim 6, characterized in that: The surface of the arc extinguishing grid and the surface of the shell sealing cover plate (2) are both sprayed with a fireproof ceramic coating.

8. The thin arc-extinguishing flame-retardant varistor according to claim 7, characterized in that: A plurality of vent holes (203) are provided on the top of the shell sealing cover plate (2).

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