Thermal tripping protection piezoresistor

Abstract

The utility model relates to the technical field of thermal tripping protection piezoresistors, in particular to a thermal tripping protection piezoresistor which comprises a piezoresistor body and first electrode plates, the two sides of the lower end of the piezoresistor body are connected with the first electrode plates, and the inner walls of the upper conductive end and the lower conductive end are connected with hot melting fuses. An insulating cylinder is arranged on the outer wall of the hot melting fuse, and the tail ends of the two sides of the insulating cylinder are fixedly connected with the conductive ends. Through cooperation of the insulating cylinder, the elastic electrode support, the piezoresistor body, the shell and the hot-melt fuse, after installation is completed, the shell is pressed on the front side of the piezoresistor body, and it is prevented that dust is stacked at the electric connection position such as the electric conduction end to affect the electric conduction effect; the problem that in the prior art, in the process that a hot melting fuse is installed on a piezoresistor, wiring needs to be conducted continuously through pressing pieces, and the installation and replacement process is tedious due to the bolt tightening process is effectively solved.

Description

A thermal trip protection varistor Technical Field

[0001] This utility model relates to the field of thermal trip protection varistor technology, specifically a thermal trip protection varistor. Background Technology

[0002] Varistors are used in series in circuits as overvoltage protection components. However, when the energy of an abnormal overvoltage exceeds the varistor's load capacity, it will eventually cause the varistor to break down and short-circuit, which may further lead to fire or even explosion of the varistor itself. To solve this problem, the existing technology connects the varistor and a thermal trip device in series. Under normal circumstances, the varistor is connected in the circuit to provide overvoltage protection, and a thermal fuse is generally used as the thermal trip device. However, in the existing technology, the process of installing the thermal fuse into the varistor requires repeated tightening of the wiring and bolts to complete the circuit connection, which makes the installation and replacement process cumbersome. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that the installation and replacement process of the existing device, which uses a hot-melt fuse to install the varistor, is cumbersome due to the need to constantly tighten the wires and bolts. Therefore, this invention proposes a thermal trip protection varistor.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A thermal trip protection varistor is designed, comprising a varistor body and an electrode plate. The electrode plate is connected to both sides of the lower end of the varistor body. Elastic electrode supports are fixed to the upper and lower sides of the left front end of the varistor body. The rear end of the elastic electrode support is connected to one side circuit of the varistor body through an electrode plate. A conductive end is clamped inside the elastic electrode support. A thermal fuse is connected to the inner wall of the upper and lower conductive ends. An insulating cylinder is provided on the outer wall of the thermal fuse. Both ends of the insulating cylinder are fixedly connected to the conductive end.

[0006] Preferably, the inner front wall of the elastic electrode support is machined with an inwardly curved arc surface consistent with the outer wall of the conductive end, and both the upper and lower ends of the elastic electrode support are machined with outwardly curved stop bars.

[0007] Preferably, a sheath is fixed to the outer wall of the insulating cylinder, and an outer shell is fixed to the outer wall of the sheath.

[0008] Preferably, the rear side of the outer wall of the housing is in contact with the outer wall of the varistor body.

[0009] The thermal trip protection varistor proposed in this utility model has the following advantages:

[0010] By coordinating the insulating cylinder, elastic electrode support, varistor body, outer shell, and thermal fuse, a larger voltage will cause the thermal fuse to overheat and melt, disconnecting the internal circuit of the varistor body and thus cutting off its connection with the external circuit, thereby protecting the varistor body. After the circuit is repaired, the user can manually or with tools pull the outer shell outward to remove the conductive end from inside the elastic electrode support. Then, a new insulating cylinder with an outer shell, conductive end, and thermal fuse is installed, and the above operation process is repeated. After installation, the outer shell is pressed against the front of the varistor body to prevent dust from accumulating at the conductive end and other contact points, which would affect the conductivity. The quick installation and replacement process using the thermal fuse structure effectively avoids the cumbersome installation and replacement process of existing technologies that require constant clamping of wires and tightening of bolts when installing thermal fuses into varistors. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the external structure of this utility model;

[0012] Figure 2 is a partial cross-sectional view of the present invention as shown in Figure 1.

[0013] Figure 3 is a partial structural schematic diagram of the insulating cylinder in Figure 2 of this utility model;

[0014] Figure 4 is a schematic diagram of the structure at point I in Figure 2 of this utility model.

[0015] In the diagram: 1. Varistor body, 2. Electrode plate one, 3. Outer shell, 4. Conductive end, 5. Sheath, 6. Elastic electrode support, 7. Thermal fuse, 8. Electrode plate two, 9. Insulating cylinder. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Referring to Figures 1-4: In this embodiment, a thermally tripped varistor includes a varistor body 1 and electrode plates 2. Electrode plates 2 are connected to both sides of the lower end of the varistor body 1. All circuit connection structures in this embodiment are made of copper, and all insulating materials are made of rubber. The varistor body 1 involved in this embodiment is a CNR type 14D680K varistor. Elastic electrode supports 6 are fixed to the upper and lower sides of the left front end of the varistor body 1. The elastic electrode supports 6 have conductive properties and elastic reset capability, which can be achieved through a corresponding heat treatment process. Existing technology is fully capable of meeting this processing requirement. The rear end of the elastic electrode supports 6 is connected to an electric... The second electrode 8 is connected to one side of the circuit of the varistor body 1. The inner side of the elastic electrode support 6 holds the conductive end 4. The inner walls of the upper and lower conductive ends 4 are connected to the thermal fuse 7. The material of the thermal fuse 7 can be determined according to the specific application. The outer wall of the thermal fuse 7 is provided with an insulating cylinder 9. Both ends of the insulating cylinder 9 are fixedly connected to the conductive end 4. The inner front wall of the elastic electrode support 6 is processed with an inwardly curved arc surface consistent with the outer wall of the conductive end 4. Both the upper and lower ends of the elastic electrode support 6 are processed with outwardly curved stops. The outer wall of the insulating cylinder 9 is fixedly connected with a sheath 5. The outer wall of the sheath 5 is fixedly connected with a shell 3. The rear side of the outer wall of the shell 3 is in contact with the outer wall of the varistor body 1.

[0018] Working principle:

[0019] When this thermal trip protection varistor is required, the user inserts the insulating cylinder 9, which includes the outer casing 3, conductive terminals 4, and thermal fuse 7, from the front of the varistor body 1 to the rear. This causes the conductive terminals 4 to push the elastic electrode support 6 open. At its extreme position, the elastic electrode support 6 is spring-loaded inward, locking the conductive terminals 4 into the corresponding position, thus installing the thermal fuse 7. The thermal fuse 7 is connected to the internal circuit structure of the varistor body 1 through the conductive terminals 4, elastic electrode support 6, and electrode plate 2. In actual use, the varistor body 1 is connected to the corresponding circuit through electrode plate 2. During use, before the abnormal overvoltage energy exceeds the varistor's load capacity, the large voltage will cause the thermal fuse 7 to overheat and melt, thus protecting the varistor body. 1. Disconnect the internal circuit and thus disconnect the connection with the external circuit to protect the varistor body 1 (i.e., thermal tripping effect). After the circuit is repaired, the user can manually or with tools pull the outer shell 3 outward to remove the conductive end 4 from the inside of the elastic electrode bracket 6. Then, repeat the above operation process to install the new insulating cylinder 9 with the outer shell 3, conductive end 4 and thermal fuse 7. After installation, the outer shell 3 is pressed on the front side of the varistor body 1 to prevent dust from accumulating at the conductive end 4 and other electrical connection points and affecting the conductivity. Through the quick installation and replacement process of the thermal fuse 7 structure, the problem of the cumbersome installation and replacement process caused by the need to constantly tighten the bolts and connect the wires when installing the thermal fuse to the varistor in the existing technology is effectively avoided.

[0020] 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 thermal trip protection varistor, comprising a varistor body (1) and an electrode plate (2), wherein the lower ends of the varistor body (1) are connected to the electrode plate (2), characterized in that: The front left side of the varistor body (1) is fixed with elastic electrode brackets (6) on both the upper and lower sides. The rear end of the elastic electrode bracket (6) is connected to one side circuit of the varistor body (1) through electrode plate two (8). The inner side of the elastic electrode bracket (6) holds a conductive end (4). The inner wall of the upper and lower conductive ends (4) is connected with a thermal fuse (7). The outer wall of the thermal fuse (7) is provided with an insulating cylinder (9). The two ends of the insulating cylinder (9) are fixedly connected to the conductive end (4).

2. The thermal trip protection varistor of claim 1, wherein: The inner front wall of the elastic electrode support (6) is machined with an inwardly curved arc surface that is consistent with the outer wall of the conductive end (4), and the upper and lower ends of the elastic electrode support (6) are machined with outwardly curved stop bars.

3. The thermal trip protection varistor according to claim 1, characterized in that: The outer wall of the insulating cylinder (9) is fixedly connected to a sheath (5), and the outer wall of the sheath (5) is fixedly connected to a shell (3).

4. The thermal trip protection varistor of claim 3, wherein: The rear side of the outer wall of the outer shell (3) is in contact with the outer wall of the varistor body (1).

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