JPH0247545Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature switch comprising a reed switch combined with a temperature-sensitive magnetic material and a permanent magnet.

As shown in FIGS. 1a and 1b, respectively, in cross-sectional and perspective views, this type of temperature switch uses parts of ferromagnetic lead pieces 4a and 4b as contacts to connect a glass tube 4c to a glass tube 4c.
An annular temperature-sensitive magnetic material 1 having a predetermined Kyrie point is arranged around the outer periphery of a reed switch 4 enclosed within the reed switch 4, and two annular permanent magnets magnetized in the same axial direction are sandwiched therebetween. 2 and 3 are fixed with adhesive.

When such temperature switches are used to control the amount of heat generated in stages according to the ambient temperature, for example, it is necessary to install a plurality of them in parallel at the location where the temperature is to be detected. However, with such a temperature switch, if an excessive force such as pulling or bending is applied to the lead piece of the reed switch when it is attached to the device in which it will be used, that force will be transmitted to the glass tube of the reed switch through the lead piece. , malfunctions such as damage to the glass tube sealing portion, resulting in changes in operating temperature characteristics, or complete failure to operate, are likely to occur. Also, if two or more of these temperature switches are installed side by side, the temperature switch is a temperature switch that opens and closes the contacts of the reed switch using magnetism, and if the individual temperature switches are placed adjacent to each other without any gaps, the individual magnets will Due to mutual interference, the operating temperature changes slightly, making it impossible to obtain a predetermined operating temperature. For this reason, each temperature switch must be installed in a position where there is relatively little interference, or each temperature switch must be fixed with a certain distance between them. Furthermore, since the outer shape is ring-shaped and the magnets must be attached while resisting the repulsive force between the magnets, the attachment work is extremely complicated and difficult.

Therefore, as shown in FIGS. 2a, b and 3 a, b, conventionally, the temperature switch main body 10 is assembled in a predetermined position from the front and fixed with a fixing band 5 such as tape, or for a predetermined period of time. A fixing body 6 made of resin, for example, is provided to stop the base plate, and the fixing body 6 is attached to the device. However, even with this method, the work is complicated, and there is a risk that the individual temperature switches may be deviated due to factors such as vibration and shock, resulting in a lack of reliability.

The present invention was developed in view of the above-mentioned drawbacks, and by integrally molding multiple temperature switches with resin, it is possible to create a composite structure that is easy to handle, has high reliability, and is easy to install. The purpose is to provide a mold temperature switch.

Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 4 is a perspective view of an embodiment of the present invention. Part of the left and right lead pieces 4a and 4b of the reed switch 4 is led out to the outside by an appropriate length, and the two temperature switch bodies 10 and the lead pieces 4 of the reed switch 4 are led out.
They are arranged at predetermined positions or with intervals in the axial direction of a and 4b, and are integrally molded with a thermoplastic resin or thermosetting resin with a uniform thickness and a melting point sufficiently higher than the detection temperature. It is something. The temperature switch body 10 is a glass tube 4 of a reed switch.
c. Since the reed pieces 4a and 4b are integrally fixed with resin, even if an external force from handling is applied to the reed piece led out, that force will not be transmitted to the glass tube 4c of the reed switch 4 inside. Therefore, there will be no change in operating temperature characteristics or malfunction.
The two temperature switches are installed in advance in the mold at a position where the predetermined operating temperature can be obtained, or with a gap between them, and are integrated, so each temperature switch is not affected by factors such as vibration or shock. The operating temperature does not change due to misalignment, making it an extremely reliable composite temperature switch that is easy to handle and install.

The shape of the mold and the number of temperature switches are not limited to the embodiment shown in Fig. 4, but may be changed depending on the shape of the device to be attached, the method of installation, and the number of temperature switches required, for example, as shown in Fig. 5. As shown in FIG. 6, three temperature switches may be molded into a cylindrical shape or a triangular prism shape as shown in FIG.

The present invention is not only a so-called normally closed type temperature switch, in which the reed switch contacts close in a range below the Curie temperature and open in a range above the Curie temperature, but also a reed switch that opens in a range below the Curie temperature. It can be applied to a so-called normally open type temperature switch that closes in a region higher than the temperature, or a combination of both.

As described above, the present invention uses thermoplastic resin or thermosetting resin to integrally mold multiple temperature switches, thereby applying excessive force such as tension or bending to the external lead piece. Even if it is
Since the reed piece is integrally fixed with resin, the force is not transmitted to the glass tube of the internal reed switch.
No changes in operating characteristics or malfunctions will occur. In addition, since multiple temperature switches are integrally fixed at predetermined positions and intervals using resin, the individual temperature switches will not shift due to vibration or impact, and the operating temperature will not change. Since the temperature switch and the temperature switch are fixed in a mold, it is possible to obtain a composite temperature switch that is extremely reliable with little variation and is easy to handle and install.
Note that among thermoplastic resins and thermosetting resins,
For example, by appropriately selecting a material with high heat resistance and strength, a heat-resistant composite temperature switch and a strong composite temperature switch can be made. In addition, the shape can be freely set according to the shape of the device used and how it is installed, and the number and combination of temperature switches can be arbitrarily selected, making it an extremely versatile composite temperature switch. Furthermore, conventionally, temperature-sensitive magnetic materials, permanent magnets, and reed switches were fixed with adhesive, but when molded with resin as in the present invention, they are installed and fixed with resin, so there is no need for adhesive, and There is no need for the complicated work of aligning the device in a predetermined position or fixing it with a fixing band after a gap.It is only necessary to install it in a predetermined position using a mold, which can significantly reduce the number of man-hours.

[Brief explanation of drawings]

Figures 1a and b are a sectional view and a perspective view, respectively, showing the structure of a conventionally used temperature switch, and Figures 2a and b are a front view and a side view, respectively, showing a conventional method of fixing a temperature switch. , Figure 3 a, b
4 is a front view and a side view for explaining another conventional fixing method, and FIG. 4 is a perspective view of an embodiment of the present invention.
5 and 6 are perspective views of other embodiments, respectively. 10...Temperature switch body, 1...Temperature-sensitive magnetic material, 2, 3...Permanent magnet, 4...Reed switch, 4a, 4b...Reed piece, 4c...Glass tube, 5...Fixing band, 6 ...Fixed body, 7...Thermoplastic resin or thermosetting resin.

Claims (1)

[Scope of utility model registration request] In a temperature switch configured by fixing a temperature-sensitive magnetic material and a permanent magnet to the outer periphery of the reed switch,
It consists of a plurality of temperature switches having different Curie point temperatures of the temperature-sensitive magnetic material, and these temperature switches can be set to only the normally closed type, only the normally open type, or the normally closed type and the normally open type to the contact point of the reed switch. A composite temperature switch characterized in that parts are aligned and assembled, and the combination is integrally molded with thermoplastic resin or thermosetting resin.