CN203085468U - Novel temperature fuse wire - Google Patents

Abstract

A new type of thermal fuse, including metal pins, sealing resin, shell, flux, two fusible alloys, metal pins and two ends of the two fusible alloys are welded and connected, fusible alloys and part of the metal pins are made of sealing resin It is packaged in the insulating space of the shell, and the flux is filled in the closed space of the shell and the sealing resin package. The two fusible alloys are in the shape of "X" and welded to the metal pins. triangle shape. During the action of the utility model, the intersection point of the two fusible alloys is weak, and the disconnection point starts to break from the intersection. The adsorption of the metal pin to the fusible alloy is relatively large, which is conducive to the shrinkage of the fusible alloy to the pin. Avoiding the reconnection of fusible alloys, the structure of the shell can reduce the generation of arcs, avoid sparks and potential safety hazards of burning, and improve the safety of use. After disconnection, the shell can effectively prevent the reconnection of molten fusible alloys. Permanently disconnect the circuit.

Description

New thermal fuse

technical field

The utility model relates to the field of special resistance products in electronic circuits, in particular to a new type of thermal fuse.

Background technique

Thermal cutoffs are non-resettable devices with one-time action. They are widely used in thermal protection of equipment to prevent one or more parts from reaching dangerous temperatures under fault conditions. The existing thermal fuses are mainly alloy-type thermal fuses, which are composed of fusible alloys with low melting points and fluxing agents, and are packaged in plastic or ceramic shells. Under normal working conditions, the fusible alloys and the two leads The feet remain connected, and when the temperature fuse feels abnormal heat and reaches the predetermined melting point temperature, the fusible alloy melts and disconnects the circuit under the action of the flux.

In the thermal fuse of the prior art, since the fusible alloy is connected to the two pins in a straight line, an arc is often generated due to the excessive current of the two pins during the operation process, which in turn causes sparks and burning of the thermal fuse product. , which brings certain hidden dangers to the use. For this reason, in order to improve safety, the thermal fuse of the prior art also adopts two parallel-connected fusible alloys to connect the two pins in a straight line. Although, the thermal fuse improves the However, in the process of use, one of the fusible alloys often breaks and the other does not break, and even one of them breaks, and the broken fusible alloy breaks and fuses in the unbroken state. On the broken fusible alloy, the result must be that the thermal fuse loses the performance of disconnecting the circuit and cannot effectively protect the circuit.

Contents of the invention

The new temperature fuse provided by the utility model changes the linear connection between the two parallel fusible alloys and the two pins in the prior art, and the anti-arc design is carried out on the structure, which can effectively reduce the arc effect during the operation process. Avoid safety hazards such as sparks and burning.

The utility model is realized through the following scheme: a novel temperature fuse, including a metal pin, a sealing resin, a shell, a fluxing agent, two fusible alloys, and the two ends of the metal pin and the two fusible alloys are welded and connected, and are fusible The alloy and part of the metal pins are encapsulated in the insulating space of the shell by the sealing resin, and the fluxing agent is filled in the internal airtight space of the shell and the sealing resin encapsulation. The feet are soldered and have an inwardly raised triangle at the bottom of the housing.

Compared with the existing technology, the utility model, in the process of action, because the intersection of the two fusible alloys is relatively weak, the breaking point starts to break from the intersection, and at the same time, the metal pins on each side and the two The root fusible alloy has two solder joints, and the adsorption of the metal pin to the molten fusible alloy is relatively large, which is conducive to the shrinkage of the fusible alloy to the pin and can avoid the situation that the fusible alloy is reconnected. At the same time, the shell has an inwardly protruding triangular shape, which can effectively block the arc at both ends of the metal pin, thereby reducing the generation of arc, avoiding sparks, burning and other safety hazards, and improving the safety of the thermal fuse. After disconnection, the melted The fusible alloy can be deposited on the bottom of the casing, and the raised triangular shape of the casing can effectively prevent the reconnection of the molten fusible alloy, which can permanently disconnect the circuit, thus improving the safety of use.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model.

Fig. 2 is a schematic cross-sectional view of a thermal fuse connected in parallel with two fusible alloys in the prior art.

In Fig. 1: 1-metal pin, 2-sealing resin, 3-shell, 4-fusing agent, 5-fusible alloy.

In Figure 2: 1'-metal pin, 2'-sealing resin, 3'-shell, 4'-fusing agent, 5'-fusible alloy.

Detailed ways

A new type of thermal fuse, including metal pins (1), sealing resin (2), shell (3), flux (4), two fusible alloys (5), metal pins (1) and two fusible The two ends of the alloy (5) are welded and connected, the fusible alloy (5) and some metal pins (1) are encapsulated in the insulating space of the shell (3) by the sealing resin (2), and the shell (3) and the sealing resin ( 2) The internal airtight space of the package is filled with a fusing agent (4), which is characterized in that: two fusible alloys (5) are in the shape of "X" and welded to the metal pin (1), and there is a Inwardly convex triangular shape.

The utility model works like this: in the process of action, because the intersection of two fusible alloys (5) is relatively weak, the breaking point starts to break from the intersection, and at the same time, the metal pins (1) on each side ) and two fusible alloys (5) have two solder joints, and the adsorption of the metal pin (1) to the molten fusible alloy (5) is relatively large, which is beneficial to the fusion of the fusible alloy (5) to the metal pin ( 1) Shrinkage can avoid the situation that the fusible alloy (5) is connected again. At the same time, the shell (3) has an inwardly protruding triangular shape, which can effectively block the arc at both ends of the metal pin (1), thereby reducing the generation of arc, avoiding sparks, burning and other safety hazards, and improving the safety of the thermal fuse. After disconnection, the molten fusible alloy (5) can be deposited on the bottom of the casing (3), and the raised triangular shape of the casing (3) can effectively block the reconnection of the molten fusible alloy (5), which can permanently disconnect the circuit. The safety of use is thus increased.

Claims (1)

1. novel Thermal Cutoffs, comprise metal pins (1), seal resin (2), shell (3), the disconnected agent (4) of fluxing, two fusible alloys (5), the two ends of metal pins (1) and two fusible alloys (5) are welded to connect, fusible alloy (5) and part metals pin (1) are encapsulated in shell (3) insulating space by sealing resin (2), and at shell (3) with seal in the inside confined space of resin (2) encapsulation the filling disconnected agent (4) of fluxing, it is characterized in that: two fusible alloys (5) are " X " shape and metal pins (1) is welded to connect, and have inwardly protruded triangular shape in shell (3) bottom.

Images