A mechanical tripping thermal protection varistor

By designing a mechanical tripping thermal protection varistor including frame, housing, compression spring, slider, varistor and pin, the problem of ineffective cutting in the prior art is solved, and the effect of quickly cutting off the circuit and protecting the safety of the equipment is achieved.

CN222705262UActive Publication Date: 2025-04-01XIAMEN SET ELECTRONICS CO LTD
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Patent Information

Application Number
CN202420252393.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-02-01
Publication Date
2025-04-01
Estimated Expiration
2034-02-01

AI Technical Summary

Technical Problem

The existing thermal protection varistor cannot be effectively cut off under overcurrent conditions, which may cause the disengagement device material to melt through, product fire, or even damage to the equipment that needs protection. The structure is complex and requires higher structural parts.

Method used

A mechanical tripping thermal protection varistor is designed, including frame, shell, pressure spring, slider, varistor and pin. Through the positional relationship and connection relationship between each other, the low-temperature alloy melts when the varistor is turned on, and the stressed end of the slider is twisted under the elastic potential energy released by the compression spring. The force-applied end pushes the pin and the lead pin to separate, and cuts off the arc to protect the circuit.

Benefits of technology

It realizes rapid circuit cutting in the case of overcurrent, prevents arcing, protects equipment safety, simplifies structural design, and reduces dimensional requirements.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of varistors, and in particular to a mechanical tripping thermal protection varistor, comprising a frame, a shell, a compression spring, a slider, a varistor and a pin, and through the positional relationship and connection relationship between each other, when the varistor is turned on, the lead pin on the varistor is heated, the low-temperature alloy used for pin welding is melted by the heat, and the bonding force between the pin and the lead pin fails. At this time, the force-bearing end of the slider is twisted around the rotation axis under the action of the elastic potential energy released by the compression spring, so that the force-applying end of the slider pushes the pin to quickly separate from the lead pin, and at the same time, the force-applying end of the slider cuts off the arc generated by the pin and the lead pin during the sliding process, thereby protecting the circuit.
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Description

Technical Field

[0001] The utility model relates to the technical field of varistor, in particular to a mechanical tripping thermal protection varistor. Background Art

[0002] Thermal protection type varistors are an overvoltage protection device used to protect electrical equipment in the event of overvoltage. When the varistor is subjected to overvoltage, the low melting point alloy between the electrode of the varistor and the reed electrode melts due to heat, and the varistor is disconnected from the reed electrode, thereby achieving the function of protecting the electrical equipment. However, the existing thermal protection type varistors on the market cannot effectively cut off when they are subjected to ampere-level overcurrents, which will cause the material of the device to melt through, the product to catch fire, and may even damage the equipment to be protected. The safety of equipment and personnel cannot be guaranteed, and the structure on the market is complex, requiring higher requirements for the size of the structural parts. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a mechanical tripping thermal protection varistor.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A mechanical tripping thermal protection varistor comprises a frame, a shell, a compression spring, a slider, a varistor and a pin; the varistor is arranged on one side of the frame and is provided with a lead pin, the frame is provided with an opening for the lead pin to extend from one side of the frame to the other side, the slider is rotatably arranged on the other side of the frame, the slider is provided with a force-bearing end and a force-applying end, when the frame is assembled in the shell, the force-bearing end of the slider and the shell act together on the two ends of the compression spring to put the compression spring in an energy storage state, the pin is welded to the lead pin by a low-temperature alloy, and the force-applying end of the slider acts on the pin.

[0006] Furthermore, the rotation center of the slider is located between the force receiving end and the force applying end.

[0007] Furthermore, the slider is provided with a limiting channel, and the pin is arranged in the limiting channel and contacts with the inner side wall of the limiting channel to form a force-applying end.

[0008] Furthermore, the pin is welded to a side surface of the lead-out pin away from the force-applying end by means of a low-temperature alloy.

[0009] Furthermore, the slider is provided with a protrusion, the protrusion is embedded in one end of the compression spring for connection, and the other end of the compression spring is abutted against or fixedly connected to the inner wall of the shell.

[0010] Furthermore, a bending portion is provided on the other side of the frame, and the bending portion abuts against the middle portion of the pin.

[0011] Furthermore, a strip-shaped limiting groove for accommodating a compression spring is provided on the other side of the frame.

[0012] Furthermore, a notch is provided at the bottom of the strip-shaped limiting groove, and the force-bearing end of the sliding block extends from the notch into the strip-shaped limiting groove and is connected to one end of the compression spring.

[0013] Furthermore, the force-applying end of the slider is provided with an arc-shaped raised rib for separating the disconnected pin and the lead-out pin.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a mechanical tripping thermal protection varistor, comprising a frame, a shell, a compression spring, a slider, a varistor and a pin, and through the positional relationship and connection relationship between them, when the varistor is turned on, the lead pin on the varistor is heated, the low-temperature alloy used for pin welding is melted by the heat, and the bonding force between the pin and the lead pin fails. At this time, the force-bearing end of the slider is twisted around the rotation axis under the action of the elastic potential energy released by the compression spring, so that the force-applying end of the slider pushes the pin to quickly separate from the lead pin. At the same time, the force-applying end of the slider cuts off the arc generated by the pin and the lead pin during the sliding process, thereby protecting the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded schematic diagram of a mechanical trip thermal protection varistor of the utility model when it is not tripped;

[0017] Figure 2 It is an exploded schematic diagram of another perspective of a mechanical trip thermal protection varistor of the utility model when it is not tripped;

[0018] Figure 3 for Figure 1 The main view;

[0019] Figure 4 It is a schematic diagram of the structure of a mechanical tripping thermal protection varistor of the utility model when it is tripped;

[0020] Description of labels:

[0021] 1. Frame; 11. Rotating axis; 12. Bending portion; 13. Strip limit groove; 2. Housing; 3. Compression spring; 4. Slider; 41. Force-bearing end; 42. Force-applying end; 5. Varistor; 51. Lead pin P1; 52. Lead pin P2; 53. Lead pin P3; 54. Lead pin P4; 55. Lead pin P5; 6. Pin. DETAILED DESCRIPTION

[0022] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0023] Please refer to Figures 1 to 4 The utility model provides a mechanical tripping thermal protection varistor, comprising a frame, a shell, a compression spring, a slider, a varistor and a pin; the varistor is arranged on one side of the frame and the varistor is provided with a lead pin, the frame is provided with an opening for the lead pin to extend from one side of the frame to the other side, the slider is rotatably arranged on the other side of the frame, the slider is provided with a force-bearing end and a force-applying end, when the slider is assembled in the shell, the force-bearing end of the slider and the shell act together on the two ends of the compression spring to put the compression spring in an energy storage state, the pin is welded to the lead pin by a low-temperature alloy, and the force-applying end of the slider acts on the pin.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides a mechanical tripping thermal protection varistor, comprising a frame, a shell, a compression spring, a slider, a varistor and a pin, and through the positional relationship and connection relationship between them, when the varistor is turned on, the lead pin on the varistor is heated, the low-temperature alloy used for pin welding is melted by the heat, and the bonding force between the pin and the lead pin fails. At this time, the force-bearing end of the slider is twisted around the rotation axis under the action of the elastic potential energy released by the compression spring, so that the force-applying end of the slider pushes the pin to quickly separate from the lead pin. At the same time, the force-applying end of the slider cuts off the arc generated by the pin and the lead pin during the sliding process, thereby protecting the circuit.

[0026] Furthermore, the rotation center of the slider is located between the force receiving end and the force applying end.

[0027] It can be seen from the above description that the rotation center of the slider plays the role of a fulcrum, that is, it plays the role of a seesaw for the force-bearing end and the force-applying end.

[0028] Furthermore, the slider is provided with a limiting channel, and the pin is arranged in the limiting channel and contacts with the inner side wall of the limiting channel to form a force-applying end.

[0029] It can be seen from the above description that the limiting channel plays a limiting role on the pin and also plays a force application role.

[0030] Furthermore, the pin is welded to a side surface of the lead-out pin away from the force-applying end by means of a low-temperature alloy.

[0031] As can be seen from the above description, the welding point is arranged on a side of the lead-out pin away from the force-applying end, which is conducive to rapid separation.

[0032] Furthermore, the slider is provided with a protrusion, the protrusion is embedded in one end of the compression spring for connection, and the other end of the compression spring is abutted against or fixedly connected to the inner wall of the shell.

[0033] From the above description, it can be seen that the slider is provided with a protrusion, which can achieve the effect of being tightly connected with the compression spring to avoid slipping, detachment, etc., which will affect the stability of the structure.

[0034] Furthermore, a bending portion is provided on the other side of the frame, and the bending portion abuts against the middle portion of the pin.

[0035] It can be seen from the above description that the bending portion is provided to assist the pin in bending when it is subjected to force.

[0036] Furthermore, a strip-shaped limiting groove for accommodating a compression spring is provided on the other side of the frame.

[0037] It can be seen from the above description that providing the strip-shaped limiting groove can effectively limit the activity space of the compression spring, thereby preventing the compression spring from twisting laterally and further affecting the elastic potential energy.

[0038] Furthermore, a notch is provided at the bottom of the strip-shaped limiting groove, and the force-bearing end of the sliding block extends from the notch into the strip-shaped limiting groove and is connected to one end of the compression spring.

[0039] Furthermore, the force-applying end of the slider is provided with an arc-shaped raised rib for separating the disconnected pin and the lead-out pin.

[0040] Please refer to Figures 1 to 4 , Embodiment 1 of the present utility model is:

[0041] A mechanical tripping thermal protection varistor comprises a frame 1, a housing 2, a compression spring 3, a slider 4, a varistor 5 and a pin 6;

[0042] The varistor 5 includes three lead pins, namely lead pin P1 51, lead pin P2 52 and lead pin P3 53, wherein lead pin P2 52 and lead pin P3 53 are located at the same electrode of the varistor 5; the current flows in the direction that lead pin P5 55 is connected to one electrode of the circuit, lead pin P4 54 and lead pin P3 of the varistor are welded with a low-temperature alloy, lead pin P1 of the varistor is connected to another electrode of the circuit, and lead pin P2 of the varistor is used as a test pin to monitor the on-off state of the varistor: in this embodiment, lead pin P3 is added to be directly welded to the pin, reducing the varistor electrode sheet used for excessive action, and can absorb the heat of the varistor faster, so that the low-temperature alloy melts, the slider moves, and the circuit is cut off.

[0043] The varistor 5 is arranged on one side of the frame and is provided with a lead pin, which is the lead pin P3 53. The frame 1 is provided with an opening for the lead pin to extend from one side of the frame to the other side; that is, the lead pin P3 penetrates to the other side of the frame and is welded with the lead pin P4 using a low-temperature alloy to achieve electrical connection;

[0044] The other side of the frame 1 is provided with a rotating shaft 11, and the slider 4 is provided with a center hole for mounting on the rotating shaft, so that the slider can be rotatably arranged on the other side of the frame through the rotating shaft. The slider 4 is provided with a force-bearing end 41 and a force-applying end 42, and the rotation center of the slider 4 is located between the force-bearing end and the force-applying end. Among them, the force-bearing end is the slider b end, and the force-applying end is the slider a end; the slider force-applying end is provided with an arc-shaped raised rib for separating the disconnected pin and the lead-out pin.

[0045] When the frame 1 is assembled in the housing 2, the force-bearing end 41 of the slider and the housing 2 act together on the two ends of the compression spring 3 to put the compression spring in an energy storage state; a bending portion 12 is provided on the other side of the frame 1, and the bending portion 12 abuts against the middle of the pin. A strip-shaped limiting groove 13 for placing the compression spring is provided on the other side of the frame 1. A notch is provided at the bottom of the strip-shaped limiting groove 13, and the force-bearing end 41 of the slider extends from the notch into the strip-shaped limiting groove and is connected to one end of the compression spring. The pin is made of a conductive material with ductility and plasticity.

[0046] In the present solution, a compression spring is used to achieve this. Of course, other methods may also be used, such as pulling and twisting a tension spring or a torsion spring to separate the isolation circuit.

[0047] The pin 6 is welded to the lead pin by a low temperature alloy. Specifically, the pin is welded to a side of the lead pin away from the force-applying end by a low temperature alloy. The force-applying end of the slider acts on the pin. The slider is provided with a limit channel, and the pin is arranged in the limit channel and contacts the inner side wall of the limit channel to form a force-applying end. The slider is provided with a protrusion, and the protrusion is embedded in one end of a compression spring for connection, and the other end of the compression spring is abutted or fixedly connected to the inner side wall of the shell.

[0048] The working principle of the above mechanical trip thermal protection varistor is: when the varistor is turned on, the lead pin P3 is heated, the low-temperature alloy used for welding the lead pin P4 is melted by the heat, and the lead pin P4 is separated from the varistor lead pin P3;

[0049] Driven by the pressure of the compression spring, the slider b end twists around the rotation axis. During the twisting process, the slider a end drives the lead pin P4 to separate from the pressure-sensitive lead pin P3. At the same time, the raised ribs at the slider a end cut off the arc generated by the lead pin P4 and the pressure-sensitive lead pin P3 during the sliding process, thereby protecting the circuit.

[0050] To summarize, the utility model provides a mechanical tripping thermal protection varistor, comprising a frame, a housing, a compression spring, a slider, a varistor and a pin, and through the positional relationship and connection relationship between them, when the varistor is turned on, the lead pins on the varistor heat up, the low-temperature alloy used for pin welding melts due to the heat, and the bonding force between the pins and the lead pins fails. At this time, the force-bearing end of the slider twists around the rotation axis under the action of the elastic potential energy released by the compression spring, so that the force-applying end of the slider pushes the pin to quickly separate from the lead pin. At the same time, the force-applying end of the slider cuts off the arc generated by the pin and the lead pin during the sliding process, thereby protecting the circuit.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A mechanical trip thermal protection varistor, characterized in that: It includes a frame, a shell, a compression spring, a slider, a varistor and a pin; the varistor is arranged on one side of the frame and the varistor is provided with a lead pin, the frame is provided with an opening for the lead pin to extend from one side of the frame to the other side, the slider is rotatably arranged on the other side of the frame, the slider is provided with a force-bearing end and a force-applying end, when the frame is assembled in the shell, the force-bearing end of the slider and the shell act together on the two ends of the compression spring to put the compression spring in an energy storage state, the pin is welded to the lead pin by a low-temperature alloy, and the force-applying end of the slider acts on the pin.

2. A mechanical trip thermal protection varistor according to claim 1, characterized in that: The rotation center of the slider is located between the force receiving end and the force applying end.

3. A mechanical trip thermal protection varistor according to claim 1, characterized in that: The slider is provided with a limiting channel, and the pin is arranged in the limiting channel and contacts with the inner side wall of the limiting channel to form a force-applying end.

4. A mechanical trip thermal protection varistor according to claim 3, characterized in that: The pin is welded to a side surface of the lead-out pin away from the force-applying end by means of a low-temperature alloy.

5. A mechanical trip thermal protection varistor according to claim 1, characterized in that: The slider is provided with a protrusion, the protrusion is embedded in one end of a compression spring for connection, and the other end of the compression spring is abutted against or fixedly connected with the inner wall of the shell.

6. A mechanical trip thermal protection varistor according to claim 1, characterized in that: A bending portion is provided on the other side of the frame, and the bending portion abuts against the middle portion of the pin.

7. The mechanical trip thermal protection varistor according to claim 1, characterized in that: A strip-shaped limiting groove for accommodating a compression spring is provided on the other side of the frame.

8. A mechanical trip thermal protection varistor according to claim 7, characterized in that: A notch is provided at the bottom of the strip-shaped limiting groove, and the force-bearing end of the sliding block extends from the notch into the strip-shaped limiting groove and is connected with one end of the compression spring.

9. The mechanical trip thermal protection varistor according to claim 1, characterized in that: The force-applying end of the slider is provided with an arc-shaped raised rib for separating the disconnected pin and the lead-out pin.