JPS608571B2 - heat sensing switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, fuses, bimetals, etc. have been used to automatically shut off the dragon path depending on the temperature.

The former melts quickly to prevent damage to electrical equipment when an excessive current flows due to a short circuit or overload, while the latter uses two metals with different coefficients of thermal expansion bonded together, and changes in temperature to cause electrical circuits to melt. It opens and closes automatically. However, fuses are inappropriate for use in devices and equipment that require the current to be cut off for their own safety when the built-in circuit receives or accumulates heat from the outside and its temperature rises. It is.

Furthermore, since bimetals open and close electric circuits when a certain temperature is reached, they functionally meet the above purpose, but there are problems in terms of cost and maintenance. The present invention has been proposed in view of the above circumstances, and is based on the following: ``A thermofusible magnet made by bonding and molding a powdered magnetic material with a solidifying agent that melts it at a constant temperature.
A heat sink characterized by having a switch buried therein that can close an electric circuit in a magnetic field, and configured so that when the temperature rises above the melting point of the magnet, the magnet loses its magnetic force and shuts off. The present invention relates to a heat-sensing switch, and its purpose is to provide a heat-sensing switch that has a simple configuration and is easy to maintain, which is useful for the safety of various devices and equipment and for detecting abnormal temperature rises. As described above, in the present invention, a switch that can close an electric circuit using a magnetic field (hereinafter referred to as a reed switch) is embedded in a heat-melting magnet formed by bonding and molding a powdered magnetic material with a solidifying agent that melts it at a constant temperature. , which constitutes one heat-sensing switch as a whole, and by incorporating the switch into the circuits of various devices and devices, when the temperature reaches the melting point of the magnet or higher, the The magnetic field is melted, the magnetic force is lost, and the haze path is cut off, thereby maintaining the safety of devices and equipment and detecting abnormal temperature rises. In addition, by appropriately selecting the solidifying material of the powdered magnetic material such as paraffin and low-temperature melting solution in the hot-melting magnet, hot-melting magnets that melt at various temperatures and lose their magnetic force can be created. The magnet melts and loses magnetic force at a predetermined temperature depending on the application,
It is possible to manufacture a heat sensing switch configured so that the haze path is blocked. The present invention will be described below with reference to Examples.

Powdered magnetic materials such as ferrite, melted paraffin,
It is mixed with a solidifying material such as a low-temperature melting solution, poured into a mold, cooled and solidified while applying a magnetic field, and then removed from the mold to obtain a permanent magnet.

To embed the reed switch in the magnet, the reed switch is placed in a mold in advance and the solidifying material is poured into the mold, or the magnet is drilled and the reed switch is inserted and fixed after the magnet is manufactured. At this time, since there are various types of paraffin and low-temperature melting solutions with different melting temperatures, it is possible to create magnets that lose their magnetic force by melting at various temperatures.

The heat-sensing switch according to the present invention manufactured in this way has excellent formability and workability. When equipment is housed in a containment vessel with excellent shock, water, and fire resistance functions, heat may accumulate due to long-term operation, which may have an adverse effect on semiconductors and the containment vessel.

In such cases, failure can be prevented by adding to the circuit a heat-sensitive switch whose melting point is below the temperature that would cause adverse effects. In addition, if the above-mentioned switch having a melting point of a predetermined temperature is installed in a structure and a current is constantly or intermittently flowing, when a fire occurs and the temperature rises,
The magnet melts and loses its magnetic force, and current no longer flows, allowing abnormalities to be detected.

In addition, during low-temperature transportation of frozen foods, etc., if the storage temperature rises during storage, storage, etc., the quality will deteriorate, so a heat-sensing switch with a magnet that melts at a predetermined low temperature is installed inside the warehouse. By installing this, quality control becomes possible.

Claims (1)

[Claims] 1 A switch capable of closing an electric circuit in a magnetic field is embedded in a heat-melting magnet formed by bonding and molding a powdered magnetic material with a solidifying agent that melts it at a constant temperature, and when the temperature rises above the melting point of the magnet. A heat sensing switch characterized in that it is configured to lose the magnet and open circuit when it rises.