CN211238100U - Prevent temperature fuse of leakage - Google Patents

Abstract

The utility model relates to a prevent temperature fuse of leakage, it includes first shell and seals resin seal through first installing fuse body in the first shell, the fuse body includes second shell, a pair of pin, helps fusing agent, fusible alloy and second and seals the resin, the second seals the resin will a pair of pin, helps fusing agent with the fusible alloy is sealed in the second shell, help fusing agent parcel fusible alloy, a pair of pin is in pass through in the second shell fusible alloy links to each other to outside extension passes in proper order the second seals resin and first sealing resin and exposes outside the first shell. The utility model discloses a temperature fuse is owing to set up first shell and second shell, helps the fusing agent can not spill over, ensures temperature fuse safe in utilization, improves its life.

Description

Prevent temperature fuse of leakage

Technical Field

The utility model relates to a prevent temperature fuse of leakage.

Background

A thermal fuse (thermal fuse) is a non-resettable circuit thermal protection device incorporating a thermal element (a fusible alloy formed into a specified size, also known as a temperature sensing body) which, when exposed to temperatures in excess of a designed temperature (i.e., the rated operating temperature of the thermal fuse: the temperature at which the conductive state of the thermal fuse changes, see the rated operating temperature definition of the national standard GB 9816-20093.10) for a sufficient period of time will open the circuit and thereby protect the circuit.

The temperature fuse comprises a pin, a ceramic or plastic protective shell, a fluxing agent and a fusible alloy. The structure of the temperature fuse is as follows: the shell is wrapped by fusible alloy coated with fusing assistant, and the fusible alloy is electrically and thermally connected with an external circuit through pins. The fusible alloy and the pins are brazed into a whole under the action of the soldering flux through the fusible alloy. When the temperature of the external circuit is higher than the rated temperature of the temperature fuse, the fusible alloy is rapidly disconnected under the promotion of the fluxing and fusing agent and shrinks to the two ends of the pin to realize the disconnection, so that the protected external circuit is cut off.

For some electrical heating appliances, the temperature during normal operation can be as high as 100 ℃ or even more, which requires that the housing of the temperature fuse has a high temperature resistance. The ceramic shell is a shell material with good temperature resistance, and is commonly used for the shell of the temperature fuse.

However, the ceramic of the thermal fuse of the ceramic shell has poor shaping, so that when the ceramic is subjected to external force and microcracks occur, the fluxing medium in the ceramic is ejected, and the thermal fuse is failed. Or the high-temperature expansion of the internal fusing assistant causes the cracking of the ceramic shell, so that the fusing assistant of the temperature fuse emerges. In addition, the coefficient of thermal expansion of the ceramic case and the coefficient of expansion of the sealing resin of the temperature fuse do not match. The micro-crack between the ceramic shell and the sealing resin occurs after the temperature fuse of the ceramic shell is impacted by high and low temperatures, and then the fluxing agent of the temperature fuse overflows along the crack.

Disclosure of Invention

The utility model aims at providing a prevent temperature fuse of leakage to solve above-mentioned problem.

In order to realize the purpose, the adopted specific technical scheme is as follows:

the utility model provides a prevent temperature fuse of leakage, its includes first shell and seals the resin seal through first and install fuse body in the first shell, fuse body includes second shell, a pair of pin, helps fusing agent, fusible alloy and second and seals the resin, the second seal the resin will a pair of pin, fluxing agent with the fusible alloy is sealed in the second shell, help fusing agent parcel fusible alloy, a pair of pin is in pass through in the second shell fusible alloy links to each other to outside extension passes in proper order the second seals resin and first seals the resin and exposes outside the first shell.

Further, a gap is provided between the first housing and the second housing.

Further, the pins are wrapped with an insulating layer extending all the way from the outside of the second housing to the outside of the first housing.

Further, the second shell is a square body.

Furthermore, one end of the first shell, exposed by the pins, is a plane, and the other end of the first shell is an arc surface.

Furthermore, one end of the arc surface of the first shell is provided with a screw hole for installation.

Further, the first housing is a ceramic housing and the second housing is a plastic housing.

Further, the first sealing resin and the second sealing resin are both epoxy resin.

Further, the pins are made of tinned copper wires or tinned copper clad steel wires.

Further, the fusible alloy is a lead-free alloy.

The above technical scheme is adopted in the utility model, the beneficial effect who has is, the utility model discloses a temperature fuse is owing to set up first shell and second shell, helps the fusing agent can not spill over, ensures temperature fuse safe in utilization, improves its life.

Drawings

Fig. 1 is a schematic perspective view of a leak-proof temperature fuse according to an embodiment of the present invention;

FIG. 2 is an exploded view of the thermal fuse shown in FIG. 1;

fig. 3 is a sectional view of the thermal fuse shown in fig. 1.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

As shown in fig. 1 to 3, a leak-proof thermal fuse includes a first case 1 and a fuse body 2 hermetically mounted in the first case 1 by a first sealing resin 3, the fuse body 2 including a second case 21, a pair of leads 22, a fluxing agent 23, a fusible alloy 24, and a second sealing resin 25, wherein the second sealing resin 25 seals the pair of leads 22, the fluxing agent 23, and the fusible alloy 24 in the second case 21 to prevent the fluxing agent 23 from overflowing. The fusing assistant agent 23 wraps the fusible alloy 24 and is used for accelerating the fusing speed of the fusible alloy 24 and improving the circuit safety. The fusing assistant 23 may be rosin or a mixture of rosin esterification products, etc. Preferably, the fusible alloy 24 is a lead-free alloy to meet environmental requirements. Its main components include Sn, Bi, in and Ag. A pair of leads 22 are connected by a fusible alloy 24 in the second casing and extend outwardly through the second sealing resin 25 and the first sealing resin 3 in this order to be exposed to the outside of the first casing 1.

The first shell 1 and the second shell 21 are made of different materials and can play a role in buffering. Preferably the first housing is a plastic housing and the second housing is a ceramic housing. The heat-resistant fusing assistant can resist temperature and prevent the shell from cracking and leaking due to expansion of the fusing assistant. And adopt inside and outside two-layer shell, can realize double insulation, ensure its safe in utilization.

Preferably, the first housing 1 and the second housing 21 have a gap therebetween. If the fluxing agent inside the second casing 21 overflows, the gap between the first casing 1 and the second casing 21 can be accommodated, so that the fluxing agent is prevented from leaking outside, and the use safety is improved.

The pin 22 may be made of a tin-plated copper wire or a tin-plated copper-clad steel wire or the like. Preferably, the pins 22 are wrapped with an insulating layer (not shown) that extends all the way out from the outside of the second housing 21 to the outside of the first housing 1, which prevents fluxing agent inside the second housing 21 from escaping along the gaps between the insulating layer and the pin conductors.

In the illustrated embodiment, one end of the first housing 1, where the lead 22 is exposed, is a plane, and the other end is an arc surface. And one end of the arc surface of the first shell 1 is provided with a screw hole 11 for installation, so that the temperature fuse can be conveniently installed on a corresponding position.

In the illustrated embodiment, the second housing 21 is a square. Of course, it may be in other shapes such as a cylinder.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications of the invention can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (10)

1. The utility model provides a prevent temperature fuse of leakage which characterized in that, includes first shell and seals the resin seal through the first fuse body of installing in first shell, the fuse body includes second shell, a pair of pin, helps fusing agent, fusible alloy and second and seals the resin, the second seals the resin with a pair of pin, fluxing agent and fusible alloy are sealed in the second shell, help fusing agent parcel fusible alloy, a pair of pin is in the second shell through fusible alloy links to each other to outside extension passes in proper order the second seals resin and first seals the resin and exposes outside the first shell.

2. The leak resistant temperature fuse of claim 1, wherein the first housing and the second housing have a gap therebetween.

3. The leak resistant thermal fuse according to claim 1, wherein said leads are wrapped with an insulating layer extending from an exterior of said second housing all the way outward to an exterior of said first housing.

4. The leak resistant temperature fuse according to claim 1, wherein said second housing is a square.

5. A leak resistant thermal fuse as in claim 1 wherein said first housing from which said leads are exposed has a flat surface at one end and an arcuate surface at the other end.

6. The leak resistant thermal fuse according to claim 5, wherein said first housing has a circular arc surface with a screw hole at one end for mounting.

7. The leak resistant thermal fuse according to claim 1, wherein said first housing is a ceramic housing and said second housing is a plastic housing.

8. The leak resistant thermal fuse according to claim 1, wherein said first sealing resin and said second sealing resin are both epoxy resins.

9. The leak resistant thermal fuse according to claim 1, wherein said pins are made of tinned copper wire or tinned copper clad steel wire.

10. The leak resistant thermal fuse according to claim 1, wherein said fusible alloy is a lead-free alloy.

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