JPH0740285Y2 - Molded mold temperature switch - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention [Industrial field of application] The present invention is a temperature switch formed by encapsulation molding with a thermoplastic or thermosetting resin, and is a ring-shaped permanent magnet or temperature-sensitive magnetic material that constitutes a temperature switching element. The present invention relates to a structure in which a positioning groove is provided on the end surface of the.

[Conventional technology]

Conventionally, in this type of temperature switch, as shown in FIG. 3, a ring-shaped permanent magnet 1, a ring-shaped temperature-sensitive magnetic substance 2, and a spacer 3 are arranged on the outer peripheral portion of the reed switch 4, and the reed switch lead 41, 42 is connected to the wire connecting terminals 51 and 52 respectively and is sealed and molded with resin (one example is shown in FIG. 5). As can be seen from FIG.
The ring-shaped assembly of the permanent magnet 1, the temperature-sensitive magnetic body 2, and the spacer 3 arranged on the outer periphery of the ring is not fixed, and both end surfaces of the ring-shaped assembly, that is, the permanent assembly, are not fixed at the time of encapsulation molding. Although the end face of the magnet is positioned by the core positioning pins 61 and 62, if molding is performed in this state, the core positioning pin does not work in the longitudinal direction of the assembly, but there is no positioning in the lateral direction. However, the injection pressure causes the positions of the ring-shaped assembly of the permanent magnet, the temperature-sensitive magnetic body, and the spacer to be displaced, which causes the reed switch 4 to be damaged.

[Problems to be solved by the device]

SUMMARY OF THE INVENTION In order to eliminate these drawbacks described above, the present invention provides a constant radial direction on the end faces of a permanent magnet or a temperature-sensitive magnetic body that is located at both ends of a magnetic circuit assembly including a permanent magnet, a temperature-sensitive magnetic body, and a spacer. It is an object of the present invention to provide a positioning groove having a width and a depth, to prevent lateral displacement of a magnetic circuit assembly during injection, to prevent damage to a reed switch, and to provide a temperature switch with stable quality.

B. Configuration of the Invention [Means for Solving the Problems] The present invention is positioned on both end parts of a magnetic circuit assembly composed of a permanent magnet, a temperature-sensitive magnetic body, and a spacer during the sealing process of a temperature switch formed by molding. A groove for use is provided, and the groove is configured to fit with the core positioning pin so as to prevent the magnetic circuit assembly from slipping during sealing molding. A groove is provided so that the core positioning pin fits in the radial direction of the end faces of the magnetic body and the permanent magnet. That is, the reed switch, the temperature-sensitive magnetic material, the permanent magnet, the spacer, and the wire connecting terminal are integrally formed with a thermoplastic or thermosetting resin having an expansion coefficient close to that of each component. In the above temperature switch, the temperature-sensitive magnetic body, the permanent magnet, the ring-shaped permanent magnet located outside the magnetic circuit composed of the spacer, or the temperature-sensitive magnetic body is provided with a radial groove on the end surface. A sealed mold type temperature switch is provided.

[Action]

A positioning groove is provided on the side surface of the permanent magnet or the temperature-sensitive magnetic material that constitutes the magnetic circuit of the temperature switch to eliminate the positional deviation of the magnetic circuit during injection molding and to prevent damage to the reed switch enclosed inside.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a state in which a magnetic circuit assembly having permanent magnets provided with positioning grooves according to the present invention arranged at both ends is fixed by core positioning pins, and FIG. 2 is a lead for sealing molding die. It is a perspective view which shows the state which fixed the switch assembly and the magnetic circuit assembly.

Core positioning pins 61, 62 (shown in FIG. 1) fixed to the sealing mold 7 in FIG. 2 at a certain depth in the longitudinal direction of the central portion of the end face of the permanent magnet 1 in FIG. When forming a temperature switch element by providing grooves 91 and 92 that fit with the above, the side where the permanent magnet grooves 91 and 92 are provided is placed on the outside, and the grooves are aligned in the same direction and temporarily fixed. I'll do it. At the time of sealing molding of the temperature switch, the reed switch element is set in the sealing molding die 7 as shown in FIG. 2, and the magnetic circuit assembly is positioned and fixed by the core positioning pin. Therefore, even if the molding resin is injected from the injection gate opening 8 of the molding die toward the core assembly, the groove 9 on the end surface of the permanent magnet is formed.
Since the 1,92 and the core positioning pins 61,62 are fitted together, the core assembly is not displaced and the reed switch 4 is not damaged. Although the permanent magnets are arranged on both sides of the magnetic circuit in the present embodiment, the permanent magnets and the temperature-sensing magnets are arranged in the same manner as in the above-described embodiments even when the permanent magnets are arranged at one end and the ring of the temperature-sensitive magnetic material is arranged at the other end. A similar effect was obtained by providing a similar groove on the outer end surface of each magnetic ring.

C. Effects of the Invention From the above, according to the present invention, the permanent magnet or the temperature-sensitive magnetic body has only the longitudinal fixing of the magnetic circuit assembly by providing the groove for fitting with the core positioning pin on the end surface. It is also possible to provide a sealed molding temperature switch of which quality is stable because the magnetic circuit assembly is fixed in the lateral direction and the deviation of the magnetic circuit assembly during sealing molding is eliminated, and the reed switch is not damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a magnetic circuit assembly having permanent magnets provided with positioning grooves according to the present invention at both ends is fixed by positioning pins. FIG. 2 is a perspective view showing a state in which a permanent magnet having a positioning groove of the present invention is fixed to a magnetic circuit assembly having both ends arranged and a sealing mold. FIG. 3 is a perspective view of a temperature switch element using a conventional permanent magnet. FIG. 4 is a perspective view showing a state in which a temperature switch element using a conventional permanent magnet is fixed to a core positioning pin. FIG. 5 is a perspective view of a sealing molding temperature switch. FIG. 6 is a perspective view of a magnetic circuit assembly assembled using a conventional permanent magnet. 1 ... Permanent magnet, 2 ... Temperature-sensitive magnetic material, 3 ... Spacer, 4 ... Reed switch, 41, 42 ... Reed switch lead, 51, 52
… Wire connection terminals, 61, 62… Core positioning pins, 7
… Sealing mold, 8… Injection gate port, 11, 12, 91, 92…
Groove, 10 ... Magnetic circuit assembly.

Claims (1)

[Scope of utility model registration request] 1. A reed switch, a temperature-sensitive magnetic material, a permanent magnet,
In a temperature switch which is composed of a spacer and a wire connecting terminal and is integrally molded of a thermoplastic or thermosetting resin having an expansion coefficient close to that of each component, a temperature-sensitive magnetic substance, a permanent magnet, A sealed molding temperature switch, characterized in that a ring-shaped permanent magnet located outside a magnetic circuit constituted by a spacer or a radial groove is provided on an end face of a temperature-sensitive magnetic body.