CN221262279U

CN221262279U - Thermal fuse

Info

Publication number: CN221262279U
Application number: CN202322312568.4U
Authority: CN
Inventors: 徐忠厚; 黄园辉; 林宗金
Original assignee: Xiamen Celtic Electronics Co ltd
Current assignee: Xiamen Celtic Electronics Co ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2024-07-02
Anticipated expiration: 2033-08-28

Abstract

The utility model relates to the technical field of fuses, in particular to a thermal fuse. Through setting up two at least parallel connection's thermal link to can improve breaking capacity, and adjacent two or more thermal link supports each other and sets up, can make all thermal link feel the same temperature as far as possible, and then can improve the precision that the fusing temperature of thermal link set for, reduce the temperature and set for the requirement.

Description

Thermal fuse

Technical Field

The utility model relates to the technical field of fuses, in particular to a thermal fuse.

Background

A thermal fuse is a non-resettable component that contains a thermal element that breaks a circuit when exposed to temperatures exceeding a designed temperature for a sufficient period of time. The thermal link is widely applied to the fields of household appliances of various sizes, personal care appliances, commercial appliances, industrial control, automation and the like, and provides over-temperature protection.

When more than two thermal fuses are used together, due to different assembly modes, certain deviation exists in the environmental temperature sensed by each thermal fuse, so that higher requirements are put forward on the fusing temperature setting of all the thermal fuses.

Disclosure of utility model

The technical problems to be solved by the utility model are as follows: provided is a thermal fuse which can make all thermal fuses feel the same temperature as much as possible, and further can improve the accuracy of setting the fusing temperature of the thermal fuses and reduce the temperature setting requirements.

In order to solve the technical problems, the utility model adopts the following technical scheme:

A thermal fuse comprising at least two thermal links connected in parallel, adjacent two or more of the thermal links being disposed against each other.

Further, the thermal fuse body adopts a metal shell, all the thermal fuse bodies are electrically connected with each other through the metal shell, and outgoing lines of all the thermal fuse bodies are electrically connected with each other through terminals.

Further, the thermal fuse further comprises a heat transfer structure, and at least two thermal fuses are fixedly connected through the heat transfer structure.

Further, the heat transfer structure comprises a clamping piece in a ring shape, the clamping piece is made of metal or ceramic, and the clamping piece is sleeved on the periphery of all the thermal fuses so that all the thermal fuses are fixedly connected.

Further, the heat transfer structure comprises a clamping piece in a semi-surrounding structure, the clamping piece is made of metal or ceramic, all thermal fuses are arranged in the clamping piece, and the opening of the clamping piece corresponding to the semi-surrounding structure is a shrinkage opening.

Further, gaps between the thermal fuses and the clamping pieces which are abutted against each other are filled with heat conducting materials. Further, the electric current fuse comprises an electric current fuse element, at least two of the thermal fuses comprise a first thermal fuse body and a second thermal fuse body, the rated action temperature of the first thermal fuse body is smaller than that of the second thermal fuse body, and the electric current fuse element is connected with the second thermal fuse body in series and then connected with the first thermal fuse body in parallel.

Further, the current fusing element is in a wire shape or a sheet shape, and the current fusing element is disposed in a material resistant to high temperature and arc.

Further, still include shell and electrode slice, be equipped with spacing post in the shell, spacing post and shell medial surface form the passageway that power supply fusing element placed jointly, the one end of electrode slice penetrates to inside and the electric connection of electric current fusing element by the outside of shell, the other end and the thermal link electricity of electrode slice are connected, the shell intussuseption is filled with fluxing agent just fluxing agent cladding is on the electric current fusing element, the clamping piece corresponds half surrounding structure's opening part and is equipped with the border of buckling of being connected with shell lateral surface fixed connection.

The utility model has the beneficial effects that:

According to the thermal fuse provided by the utility model, the breaking capacity can be improved by arranging at least two thermal fuses which are connected in parallel, and two or more adjacent thermal fuses are mutually abutted, so that all the thermal fuses can feel the same temperature as much as possible, the accuracy of setting the fusing temperature of the thermal fuses can be improved, and the temperature setting requirement is reduced.

Drawings

Fig. 1 is a front view of a thermal fuse according to a first embodiment of the present utility model;

FIG. 2 is a side view of a thermal fuse according to a first embodiment of the present utility model;

FIG. 3 is an exploded view of a thermal fuse according to a first embodiment of the present utility model;

FIG. 4 is a top view of a thermal fuse according to a second embodiment of the present utility model;

fig. 5 is a front view of a thermal fuse according to a second embodiment of the present utility model;

Fig. 6 is a bottom view of a thermal fuse according to a second embodiment of the present utility model;

FIG. 7 is an exploded view of a thermal fuse according to a second embodiment of the present utility model;

description of the reference numerals:

1. a first thermal link; 2. a terminal; 3. a second thermal fuse; 4. a clamping piece;

11. A first thermal link; 12. a current fusing element; 13. an electrode sheet; 14. a housing; 15. a fusing auxiliary agent; 16. a second thermal fuse; 17. and (5) clamping the sheet.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 7, the thermal fuse provided by the present utility model includes at least two thermal fuses connected in parallel, and two or more adjacent thermal fuses are disposed against each other.

From the above description, the beneficial effects of the utility model are as follows:

From the above description, it is apparent that the thermal link employs a metal housing, which further improves the heat transfer capability, and allows all thermal links to experience the same temperature and provide electrical connection as much as possible.

From the above description, it is known that the addition of the heat transfer structure can further make all the thermal fuses feel the same temperature.

From the above description, the annular clamping piece made of metal or ceramic is used as a heat transfer structure, so that the thermal fuse links are fixed as closely as possible, and the same temperature can be sensed as much as possible.

From the above description, the clamping piece made of metal or ceramic and having a semi-surrounding structure is adopted as the heat transfer structure, so that the thermal fuse links are fixed, the thermal fuse links can be tightly attached together as much as possible, and the same temperature can be sensed as much as possible.

Further, gaps between the thermal fuses and the clamping pieces which are abutted against each other are filled with heat conducting materials.

As is apparent from the above description, the heat conduction effect can be further improved by filling the heat conduction material in the specific position.

Further, the electric current fuse comprises an electric current fuse element, at least two of the thermal fuses comprise a first thermal fuse body and a second thermal fuse body, the rated action temperature of the first thermal fuse body is smaller than that of the second thermal fuse body, and the electric current fuse element is connected with the second thermal fuse body in series and then connected with the first thermal fuse body in parallel.

As can be seen from the above description, when the thermal fuse works normally, since the main loop resistance is far smaller than the branch resistance, most of the current flows through the first thermal fuse body, when the first thermal fuse body senses abnormal temperature and breaks, the current is diverted from the main loop to the branch, so as to avoid arcing caused by breaking of the first thermal fuse body, and after the current fusing element breaks, the spring in the first thermal fuse body pushes the contact to a safe distance, so that even if the voltage drop of the circuit is fully applied to the two poles of the first thermal fuse body, no arc is generated. If the current of the circuit is too small, the abnormal temperature will continue to rise due to the fact that the current fusing element fuses, the current is small at the moment, and serious arc discharge cannot occur.

From the above description, it is known that the current fusing element is in a wire shape or a sheet shape, and the current fusing element is placed in a material resistant to high temperature and arc, and the resistance to high temperature and arc can be further improved.

As is apparent from the above description, the above structure realizes the assembly and connection of the respective components, and the provision of the fusing aid can accelerate the fusing response of the current fusing element and improve the breaking capacity.

Referring to fig. 1 to 3, a first embodiment of the present utility model is as follows:

The utility model provides a thermal fuse which comprises two thermal fuses and a heat transfer structure which are connected in parallel, wherein rated operating temperatures of the two thermal fuses are the same. The two thermal fuses are a first thermal fuse 1 and a second thermal fuse 3, respectively.

Two thermal links all adopt metal casing, and two adjacent thermal links are mutually supported and are set up. All the thermal fuses are electrically connected with each other through the metal shell, and the outgoing lines of all the thermal fuses are electrically connected with each other through the terminals, namely, the leads on one side of the sealing glue of the two thermal fuses are connected through the terminal 2, so that a parallel circuit is formed, and current is shunted to the two thermal fuses during normal operation. When the ambient temperature reaches the preset fusing temperature, the two thermal fuses act synchronously, and the electric arc energy is reduced as the current is shunted, so that the product is safely disconnected.

The annular clamping pieces 4 made of metal materials are used as a heat transfer structure, and are sleeved on the peripheries of all the thermal fuses so that all the thermal fuses are fixedly connected, and the effect of fixing the thermal fuses is achieved, so that the thermal fuses can be clung to each other as much as possible, and the same temperature is ensured to be sensed.

Of course, in some embodiments, a ceramic clamping piece may be used instead of a metal clamping piece, both of which have the advantage of fast heat conduction, so that the two thermal fuses are ensured to feel the same temperature;

In order to further improve the heat conduction effect, gaps between the thermal fuse body and the metal sheet or the ceramic block which are abutted against each other can be filled with materials with high heat conductivity coefficients, such as heat conducting resin, graphene and the like.

Referring to fig. 4 to 7, a second embodiment of the present utility model is as follows:

The utility model provides a thermal fuse, which comprises two thermal fuses connected in parallel, a heat transfer structure, a current fusing element 12, a shell 14 and an electrode slice 13. Wherein the two thermal fuses are a first thermal fuse 11 and a second thermal fuse 16, respectively. The rated operating temperature of the first thermal fuse is smaller than that of the second thermal fuse, the current fusing element is a wire-shaped or sheet-shaped fuse wire or fuse piece, and the current fusing element is placed in a high-temperature and arc-resistant material, such as silicon rubber, quartz sand, arc extinguishing paste and the like.

The current fusing element 12 is connected in series with the second thermal fuse and then connected in parallel with the first thermal fuse. The method comprises the following steps: the current fusing element is connected in series on the lead wire at one side of the second thermal fuse body sealing glue, the other end of the current fusing element is connected with the lead wire at one side of the first thermal fuse body sealing glue, and therefore a parallel circuit is formed by the main loop of the first thermal fuse body, the second thermal fuse body and the branch circuit connected in series with the current fusing element.

The shell is internally provided with a limit column, the limit column and the inner side surface of the shell jointly form a channel for placing the power supply fusing element, one end of the electrode plate penetrates into the shell from the outside of the shell to be electrically connected with the power supply fusing element, the other end of the electrode plate is electrically connected with the thermal fuse body, the shell is internally filled with a fusing assistant 15 and the fusing assistant is coated on the power supply fusing element, and the opening of the clamping piece corresponding to the semi-surrounding structure is provided with a bending edge fixedly connected with the outer side surface of the shell.

Two thermal links all adopt metal casing, and two adjacent thermal links are mutually supported and are set up.

The clamping piece 17 which is made of metal or ceramic and is in a semi-surrounding structure is used as a heat transfer structure, all thermal fuses are arranged in the clamping piece, and the opening of the clamping piece corresponding to the semi-surrounding structure is a shrinkage opening. The clamping piece plays a role in fixing the thermal link so that the thermal link can be clung together as much as possible, and the same temperature is ensured to be sensed.

When the thermal fuse works normally, because the resistance of the main loop is far smaller than the resistance of the branch circuit, most of current flows through the first thermal fuse body, when the first thermal fuse body senses abnormal temperature and breaks, the current is diverted from the main loop to the branch circuit, arc discharge is avoided when the first thermal fuse body breaks, after the current fusing element breaks, the spring in the first thermal fuse body pushes away the contact to a safe distance, and even if the voltage drop of the circuit is completely applied to the two poles of the first thermal fuse body, electric arcs can not be generated. If the current of the circuit is too small, the abnormal temperature will continue to rise due to the fact that the current fusing element fuses, the current is small at the moment, and serious arc discharge cannot occur.

In summary, according to the thermal fuse provided by the utility model, the breaking capacity can be improved by arranging at least two thermal fuses connected in parallel, and two or more adjacent thermal fuses are arranged in an abutting manner, so that all the thermal fuses can feel the same temperature as much as possible, the accuracy of setting the fusing temperature of the thermal fuses can be improved, and the temperature setting requirement can be reduced.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims

1. A thermal fuse comprising at least two thermal links connected in parallel, characterized in that two or more adjacent thermal links are disposed against each other; the thermal fuse further comprises a heat transfer structure, and at least two thermal fuses are fixedly connected through the heat transfer structure.

2. The thermal fuse of claim 1, wherein the thermal fuse links employ a metal housing, all thermal fuse links are electrically connected to each other through the metal housing, and the lead wires of all thermal fuse links are electrically connected to each other through terminals.

3. The thermal fuse according to claim 1, wherein the heat transfer structure comprises a ring-shaped clamping piece made of metal or ceramic, and the clamping piece is sleeved on the periphery of all the thermal fuses so as to fixedly connect all the thermal fuses.

4. The thermal fuse according to claim 1, wherein the heat transfer structure comprises a clip in a semi-enclosed structure, the clip is made of metal or ceramic, all thermal fuses are disposed in the clip, and the clip corresponds to an opening of the semi-enclosed structure and is a shrinkage opening.

5. A thermal fuse as claimed in claim 3 or claim 4, wherein the gap between the thermally fused links and the clip are filled with a thermally conductive material.

6. A thermal fuse according to claim 3, further comprising a current fusing element, at least two of said thermal fuses comprising a first thermal fuse and a second thermal fuse, said first thermal fuse having a rated operating temperature less than a rated operating temperature of the second thermal fuse, said current fusing element being connected in series with the second thermal fuse and then in parallel with the first thermal fuse.

7. The thermal fuse of claim 6, wherein the current fusing element is in the form of a wire or sheet and is disposed in a high temperature and arc resistant material.

8. The thermal fuse of claim 7, further comprising a housing and an electrode plate, wherein a limit post is arranged in the housing, the limit post and the inner side of the housing together form a channel for placing the current fusing element, one end of the electrode plate penetrates into the interior from the exterior of the housing to be electrically connected with the current fusing element, the other end of the electrode plate is electrically connected with the thermal fuse body, the housing is filled with a fluxing agent and the fluxing agent is coated on the current fusing element, and a bending edge fixedly connected with the outer side of the housing is arranged at an opening of the clamping piece corresponding to the semi-surrounding structure.