JPH0743910Y2 - Temperature switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is a reed switch having a magnetic material reed piece by controlling the amount and distribution of magnetic flux from a permanent magnet by a temperature-sensitive magnetic material whose magnetic characteristics change with temperature. The present invention relates to a temperature switch that opens and closes the contact.

<Prior Art> Ferromagnetic lead pieces 4a4b as shown in FIGS. 3 and 4.
The ring-shaped temperature-sensitive magnetic body 1 is arranged on the outer circumference of the reed switch 4 enclosed in the glass tube 4c with a part of the contact point corresponding to the contact point. Further, the temperature switch body is constructed by fixing two annular permanent magnets 2 and 3 magnetized in the same direction so as to sandwich the temperature-sensitive magnetic body 1 to the glass tube 4c with an adhesive. The temperature switch body shown in FIGS. 3 and 4 is a normally closed type temperature switch in which the contact of the reed switch is closed to open when the ambient temperature reaches the operation set temperature due to the temperature rise. There are normally open type and band operation type temperature switches.

When the temperature switch body 14 having the above-described structure is attached to the device, if the structure of the reed switch is left as it is, an unreasonable force such as pulling or bending is applied to handle the lead of the reed switch. Therefore, there is a problem that the glass tube sealing portion is damaged and the operating temperature characteristic is changed, or that the operating failure is likely to occur at all. Furthermore, since the outer shape is circular,
There is a problem that it is difficult to attach and the thermal response is poor. For this reason, as shown in FIGS. 5 and 6, a plate-shaped body having good heat conductivity is provided with an attachment hole 5a at one end and the other end is formed into a tubular shape. The temperature switch body 14 is inserted into the portion 5b, and the external connection lead wires 8 and 9 are connected to the lead pieces 4a and 4b, respectively. The connection portions are covered with fixed tubes 6 and 7, respectively, and the temperature switch body 14 is arranged so that one ends of the fixed tubes 6 and 7 are inserted into the tubular portion 5b. After that, an adhesive is injected from the gap 5c of the tubular portion 5b, and the temperature switch body 14 and the fixed tubes 6 and 7 arranged at both ends of the temperature switch body 14 are bonded and fixed to the tubular portion 5b. Further, an adhesive is injected into the lead outlets 6a and 7a of the fixed tubes 6 and 7 to bond the lead wires 8 and 9 to the fixed tubes 6 and 7, respectively. In this way, the external force applied to the lead wires 8 and 9 is prevented from being transmitted to the internal reed switch. After that, the holding member 5 is attached to the device using the attachment hole 5a.

<Problems to be solved by the device> In the case of the conventional temperature switch, since the temperature switch body is fixed to the holding member, it is not only easy to mount on the device, but also the glass tube sealing part is damaged. Never. Further, the thermal response is improved. However, as described above, the work for fixing and supporting the temperature switch main body to the holding member is extremely complicated, and there is a problem that the cost becomes high.

An object of the present invention is to provide a temperature switch that facilitates work when fixing the temperature switch body to a holding member.

<Means for Solving the Problems> According to the present invention, a temperature switch body constituted by fixing an annular temperature-sensitive magnetic body and an annular permanent magnet to the outer circumference of a reed switch, and for holding the temperature switch body. Holding member and an insulating plate that supports the holding member together with the temperature switch body, the holding member is made of a non-magnetic material having good thermal conductivity, and the holding member extends in a predetermined direction. A tubular portion to which the annular temperature-sensitive magnetic body and the annular permanent magnet are attached in contact with each other, a first edge portion formed integrally with the tubular portion and extending in a direction orthogonal to the predetermined direction, and the tubular portion integrally with the tubular portion. A second edge portion that is formed and extends in a direction orthogonal to the predetermined direction and that faces the first edge portion, and the insulating plate is formed with a hole portion that extends in the predetermined direction; The tubular part is the above The tubular portion is inserted into the hole portion and is held by the insulating plate, and the insulating plate is sandwiched by the first and second edge portions, and the insulating plate is provided with an external connection terminal. A temperature switch is obtained in which the lead piece of the reed switch is connected to the external connection terminal.

<Example> The present invention will be described below with reference to an example.

With reference to FIGS. 1 and 2, a rectangular insertion hole is provided at a substantially central portion of the heat resistant insulating substrate 10. Also,
External connection terminals are provided near both ends of the insulating substrate 10.
12 and 13 are attached. And this insulating substrate
A holding member 11 having good thermal conductivity is fixed to 10 as described later. The holding member 11 is a non-magnetic aluminum plate or copper plate, and is used as a heat absorbing / dissipating plate.

As shown in FIG. 2, the holding member 11 has an edge portion (first edge portion) 11a whose one end is bent downward, a tubular portion 11b formed in a side surface of a circular pipe, and a stepped portion 11c. It has a mounting portion 11d extending rightward in the figure (this step portion 11c
Is used as an edge portion (second edge portion)). A mounting hole 11e is formed in the mounting portion 11d.

The tubular portion 11b of the holding member 11 is inserted into the insertion hole of the insulating substrate 10, and the insulating substrate 10 is firmly sandwiched by the edge portion 11a and the step portion 11c and fixed by an adhesive.

As described above, the temperature switch body 14 composed of the reed switch 4, the temperature-sensitive magnetic body 1, and the permanent magnets 2 and 3 has the holding member 11
It is fixed to the tubular portion 11b of this with an adhesive. After that, lead piece 4
The a and 4b are connected to the external connection terminals 12 and 13 by soldering (or welding) or the like. The lead piece 4a
If 4b and 4b are bent in the middle, expansion and contraction due to heat, vibration, and shock can be better absorbed.

The temperature switch constructed as described above has a mounting portion 11d.
It is screwed to the device under test using the mounting hole 11e formed in.

<Advantages of Device> As described above, according to the present invention, the temperature switch can be easily attached to the holding member and the assembling can be facilitated. Therefore, cost reduction can be achieved. Moreover, since the holding member has good thermal conductivity, the thermal response is not deteriorated, and since the lead terminal is connected and fixed to the external terminal mounted on the insulating substrate, external force may be directly applied to the lead terminal (lead piece). Absent.
In other words, a low-cost and highly reliable temperature switch can be supplied.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the temperature switch according to the present invention, FIG. 2 is a side view showing an embodiment of the temperature switch according to the present invention, and FIGS. 3 and 4 are the structure of the temperature switch body. FIG. 5 is a sectional view and a perspective view, FIG. 5 and FIG. 6 are an exploded view and a perspective view showing a conventional temperature switch, respectively. 1 ... Temperature-sensitive magnetic material, 2, 3 ... Permanent magnet, 4 ... Reed switch, 4a, 4b ... Reed piece, 4c ... Glass tube, 5 ... Holding member, 5
a ... gap, 6,7 ... fixed tube, 6a, 7a ... lead outlet, 8,9 ... lead wire, 10 ... insulating substrate, 11 ... holding member, 12,13 ... external terminal, 14 ... temperature switch body

Claims (1)

[Scope of utility model registration request] 1. A temperature switch body formed by fixing an annular temperature-sensitive magnetic body and an annular permanent magnet to the outer circumference of a reed switch, and a holding member for holding the temperature switch body.
An insulating plate that supports the holding member together with the temperature switch body, the holding member is made of a non-magnetic material having good thermal conductivity, and the holding member extends in a predetermined direction and the annular temperature-sensitive magnetic body is formed. And a tubular portion to which the annular permanent magnet is abutted and mounted, a first edge portion formed integrally with the tubular portion and extending in a direction orthogonal to the predetermined direction, and the first direction formed integrally with the tubular portion and the predetermined direction. Has a first edge portion and a second edge portion that faces the first edge portion, and a hole portion that extends in the predetermined direction is formed in the insulating plate, and the tubular portion has the hole. The tubular portion is inserted into a portion and is held by the insulating plate, and the insulating plate is sandwiched by the first and second edge portions,
An external connection terminal is provided on the insulating plate, and a lead piece of the reed switch is connected to the external connection terminal.