JPS628111Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature switch consisting of a reed switch, an annular permanent magnet, and an annular temperature-sensitive magnetic material, and is particularly applicable to a temperature switch that is grounded to a container (for example, the body of an automobile). The present invention relates to a temperature switch suitable for detecting the temperature of an insulating fluid (for example, torque converter oil) in a container.

FIG. 1 shows a so-called normally closed type temperature switch, which is a conventional example of a temperature switch consisting of a reed switch, an annular permanent magnet, and an annular temperature-sensitive magnetic material, and is capable of opening the reed switch at a predetermined temperature.

In the figure, an annular temperature-sensitive magnetic material 3 having a Curie point corresponding to the operating temperature is interposed between annular permanent magnets 1 and 2 whose magnetic poles are oriented in the axial direction and in the same direction to form a cylindrical body. It consists of a reed switch inserted into the body.

When this temperature switch main body is used for liquid temperature detection, conventionally, as shown in Fig. 2, it is housed in a bottomed cylindrical case 5 made of brass or the like, and the inside is filled with a resin 6 having good thermal conductivity, and the insulating material is One lead 4a of the reed switch 4, which is connected to the external connection terminal 8 through the lid 7, is electrically insulated from the case 5, and the temperature switch body is fixed. The structure is such that the adhesive 9 is raised to prevent liquid from entering the case 5, the external connection terminal 8 is connected to the power source via a load, and the other lead 4b of the reed switch 4 is soldered to the bottom of the case 5. , and were connected and grounded by brazing, etc. The thread cut 51 is for attaching to the detected part.

Such a sealed temperature switch was used to detect the liquid temperature regardless of whether the liquid to be detected was conductive (e.g. water) or insulative (e.g. oil for a torque converter), but the case 5 was made of brass. die-casting is difficult and has a complicated shape, which requires many processing steps and is expensive, and requires a large amount of expensive resin. However, since the upper part of the screw portion is exposed to the outside air, there is a further delay in response, and it cannot be said to be a temperature switch suitable for detecting the ambient temperature.

The purpose of this invention is to detect the ambient temperature when the object to be detected is grounded, when the container is grounded and the liquid to be detected is electrically insulating, or in a place where there is no risk of water exposure. The purpose of the present invention is to provide a temperature switch with a simple structure and high reliability suitable for applications such as the following.

The present invention consists of a temperature switch body consisting of a permanent magnet and a temperature-sensitive magnetic material fixed to the outer periphery of the reed switch;
In this temperature switch, which consists of a cylindrical part into which the temperature switch main body is inserted and fixed, and a heat absorbing body having a mounting allowance for installation, a tongue piece extending toward the axis is integrated into one end of the heat receiving plate, that is, the cylindrical part of the heat absorbing plate. A covered and insulated lead wire is connected to one lead of the reed switch, and a fixed tube is fitted to the end of the reed switch while covering this connection, and the other end of the reed switch is The lead has a bent part in the middle, and the end part is bent at a right angle, and the temperature switch body and fixing tube are inserted and fixed in the cylindrical part of the heat absorption plate, and the tongue piece and the lead are bent at a right angle. The present invention relates to a temperature switch characterized in that the temperature switch is connected to the temperature switch.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a front perspective view of an embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof.

The heat receiving plate 10 is made of brass with a thickness of about 0.4 to 0.6 mm.
The horizontal part is formed into a cylindrical part 101 with a slit 102, and the upright part is a mounting clearance part 1.
03, and a mounting hole 104 is provided in the center. The cylindrical part 1 is located at the upper part of one edge of the cylindrical part 101.
A tongue piece 105 having a length reaching approximately the axis of 01 is integrally provided vertically.

For example, a Teflon-coated lead wire 11 is attached to the lead 4a of the reed switch 4 of the temperature switch body.
One end is connected by soldering, and this lead wire 1
An insulating cylindrical fixed tube 12 is passed through the fourth
As shown by the chain line in the figure, the open end is in contact with the end face of the magnet 2, so that the solder connection portion and the end of the reed switch 4 are covered. The other lead 4b of the reed switch 4 has a V-shape in the middle, and its ends are bent at right angles to substantially the same side to form a bent portion 13 and a right-angled bent portion 14.

To make the temperature switch, first make a temperature switch body with a lead wire 11 and a fixed tube 12, and then insert the right-angled bent part of the lead 4b into the slit 102 on the cylindrical part 101 of the heat receiving plate 10 as shown by the arrow in FIG. Insert it while facing the right angle bending part 14 into the tongue piece 105.
The temperature switch body and the fixing tube are fixed to the cylindrical part 101 by injecting adhesive into the cylindrical part 101 through the slit 102 of the cylindrical part 101 and assembled. It will be done.

A temperature switch using a brass heat receiving plate and Teflon-coated lead wire as described above does not cause oxidation or corrosion of the heat receiving plate or deterioration of the insulation coating in torque converter oil, and is suitable for small loads (e.g. 5V-5mA). Optimal. When detecting the ambient temperature in a place where there is no risk of being exposed to water, use an inexpensive aluminum heat-receiving plate and PVC-coated lead wire to connect lead 4.
b may be caulked and joined to the tongue piece 105.

The bent part of the lead 4b is the lead 4 during assembly work.
It is provided to protect the glass sealing part by absorbing the external force applied to the end of b and absorbing the stress due to the difference in thermal expansion between the heat receiving plate 10 and the temperature switch body after assembly. The right-angled bent portion 14 is formed for joining with the tongue piece 105, and its bent length is shorter than the radius of the cylindrical portion 101.
Further, the tongue piece 105 has a length that does not reach the center of the cylindrical portion 101.

Since the temperature switch according to the present invention has the above-mentioned configuration, the temperature switch body is in direct contact with the liquid to be detected and the atmosphere, and the heat is collected by the heat receiving plate, so the response is good, and the processing of the heat receiving plate can be done by cutting. There is no need to cut and bend the plate material, and it is easy to mass produce and is inexpensive. Also, installation is easier than conventional screwing, as it only requires screwing into the mounting holes.

As described above, according to the present invention, it is possible to obtain a temperature switch that is inexpensive, has good responsiveness, and is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a known normally closed temperature switch, FIG. 2 is a sectional view of an example of a conventional temperature switch for liquid temperature detection, FIG. 3 is a front perspective view of a temperature switch according to the present invention, and FIG. The figure is also an exploded perspective view. 1, 2: Permanent magnet, 3: Temperature-sensitive magnetic material, 4: Reed switch, 4a, 4b: Lead, 5: Case,
6: Embedded resin, 7: Lid body, 8: External connection terminal,
9: Adhesive, 10: Heat receiving plate, 101: Cylindrical part, 1
02: Slit, 103: Mounting allowance, 105:
Tongue piece, 11: Covered insulated lead wire, 12: Fixed tube.

Claims (1)

[Scope of utility model registration request] A temperature switch consisting of a temperature switch body configured by fixing a permanent magnet and a temperature-sensitive magnetic material to the outer periphery of the reed switch, and a cylindrical heat receiving plate having a mounting margin for inserting and fixing the temperature switch body, A tongue piece extending toward the axis of the cylindrical portion is integrally provided at one end of the cylindrical portion constituting the heat receiving plate, and an insulated lead wire is connected to one lead of the reed switch. , a fixed tube is fitted to the end of the reed switch covering the connection part, a bent part is formed in the middle of the other lead, and the temperature switch main body and the fixed tube are inserted into the cylindrical part of the heat receiving plate. A temperature switch which is fixed and connected to the tongue of the cylindrical portion and the end of the other lead.