JPH0449801Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention incorporates a temperature-sensitive resistance element whose resistance value changes depending on the temperature, and a reed switch that turns on and off depending on the temperature. This invention relates to a temperature sensing element.

(Prior art) For example, in automobiles, temperature is controlled by detecting water temperature using a temperature-sensitive resistance element such as a thermistor, and temperature-sensitive reed switches are used to control electric fans, overdrive, or overheat. We are trying to prevent this. For optimal control, it is preferable to perform direct detection by integrating two sensing elements and associating them with each other.

(Problem that the invention aims to solve) As mentioned above, in order to perform optimal control, it is necessary to use a device that integrates a temperature-sensitive resistance element and a temperature-sensitive reed switch. Because wires are connected and coated, it is difficult to integrate with a temperature-sensitive reed switch and cannot be directly detected.For example, if both are housed in a cylindrical metal case, However, there were problems in that the response was poor and the device became larger.

The present invention solves the above problems and achieves miniaturization of the device by integrating a temperature-sensitive resistance element and a temperature-sensitive reed switch, improves responsiveness, and provides a temperature-sensing element that is effective for optimal control. The purpose is to provide

[Structure of the invention] (Means for solving the problem and its effect) The present invention uses a plate-like temperature-sensitive resistance element having a through hole that passes through the shaft of a temperature-sensitive reed switch. To obtain an element that can be integrated with a switch, miniaturize the device, and enable optimal control.

(Embodiment) Figures 1a and 1b are a front sectional view and a left side view showing an embodiment of the present invention.

In the figure, 1 is a pair of intersecting lead pieces 1
This is a reed switch in which the intermediate portion between a and 1b is sealed with a glass tube 1c. A ring-shaped temperature-sensitive magnetic material (for example, ferrite) is placed on the outer peripheral surface of the reed switch 1 so as to cover the reed piece contact portion.
4, and two ring-shaped permanent magnets 2 and 3 are provided on both sides of the temperature-sensitive magnetic body 4 in contact with each other. This temperature-sensitive magnetic material 4 and permanent magnets 2 and 3
Together with the reed switch 1 and the reed switch 1, a temperature-sensitive reed switch is constructed.

In the figure, 5 is the glass tube 1c of the reed switch 1.
It is a plate-shaped temperature-sensitive resistance element having a through hole 5a passing through it, and is arranged on the side surface of one permanent magnet 2 via an electrode 7. 6 has one end connected to the inner surface of one electrode 7 of the temperature-sensitive resistance element 5 by soldering or the like, and is interposed between the glass tube 1c, the permanent magnet 2, the ferrite 4, and the permanent magnet 3, and the tip thereof is connected to the inner surface of one electrode 7 of the temperature-sensitive resistance element 5. It is an externally extending tubular conductive metal. This conductive metal 6 is made of a non-magnetic material.

As described above, a temperature sensing element that can be integrated with a temperature sensing reed switch is provided by using a plate-shaped temperature sensing resistance element having a through hole that can be inserted into the shaft portion (glass tube in the figure) of the reed switch 1. became possible.

Next, a device in which the temperature sensing element is assembled into a metal case made of a non-magnetic material and suitable for actual use will be described with reference to FIG.

The metal case 10 shown in FIG. 2 has a cylindrical shape with a bottom as a whole, and has a small hole 10a for protruding a lead piece on the bottom surface of the left tip, and a stepped portion 10b inside near the bottom.
It has a thread groove 10c on the right outer circumferential surface, and has an inner stepped portion 10d near the opening. Then, with the temperature sensing element stored, one lead piece 1a of the reed switch 1 is made to protrude from the small hole 10a, the small hole is filled with solder, etc., and grounded to the metal case, and the lead piece 1a of the reed switch 1 is connected to the stepped portion 10b near the bottom. The other electrode of the temperature-sensitive resistance element 5 is grounded to the metal case via the solder 8 or the like. In this state, silicone resin 11 is poured into the metal case to fix the temperature sensing element.
At this time, the tubular conductive metal 6 and the lead piece 1b are both set so as to protrude to the right from the opening stepped portion 10d. Then, an insulating plate 12 having a guide groove capable of guiding the tubular conductive metal 6 and the lead piece 1b is attached to the stepped portion 10d on the opening side. Further, the tubular conductive metal 6 and the lead piece 1b are made to protrude, and an insulating plate 13 having a guide groove for guiding the lead piece 1b is attached to the protruding end. next,
An L-shaped terminal 17 is attached to the side surface of the insulating plate 12 provided at the stepped portion 10d, and an L-shaped terminal 18 is also attached to the insulating plate 13. After that, one end of one L-shaped terminal 17 is connected to the tubular conductive metal 6 by soldering or the like, one end of the other L-shaped terminal 18 is connected to the lead piece 1b by soldering, and the opening of the metal case 10 is insulated. Fill with resin 14. The terminal 17 protruding from the opening of the metal case 10 becomes the active terminal of the temperature-sensitive resistance element, and the other protruding terminal 18 becomes the active terminal of the temperature-sensitive reed switch.

The device assembled in this manner can be easily attached by screwing it into a desired location via the thread groove provided on the outer periphery of the metal case 10.

The present invention is not limited to the embodiments described above, but can be implemented in various modifications.

For example, the temperature sensing element may be configured as shown in FIG. An elastic member 15 is interposed between the permanent magnet 2 and the temperature-sensitive resistance element 5, so that even if thermal expansion or contraction occurs during use, it can be absorbed and the elastic member 15 can be used for reed switches and other elements. This has the advantage of preventing damage to the material. Rubber or a heat insulating material can be used as this elastic member. When a heat insulating material is used, it is possible to prevent the spontaneous heat generation of the temperature-sensitive resistance element from being transmitted to the temperature-sensitive reed switch side.

Furthermore, the conductive metal 6 does not necessarily need to be provided on the outer peripheral surface of the glass tube 1c, and as shown in FIG.
6, and the outer peripheral surface of the electrode 7 of the temperature-sensitive resistance element 5 may be connected by soldering.

Further, the shape of the conductive metal 6 is not limited to a tubular or cylindrical shape, but may be any shape such as a semi-cylindrical shape, a shape divided into a plurality of parts, a plate shape, a lead wire shape, etc.

Furthermore, the other electrode of the temperature-sensitive resistance element is not limited to the above embodiment, and may be grounded to the metal case after connecting the lead piece 1a and the other electrode of the temperature-sensitive resistance element of the temperature-sensitive resistance element. A separate ground terminal may be provided.

Furthermore, the mounting structure to the metal case may be constructed as shown in FIG. The differences from Fig. 2 are the shape of the conductive metal 19 connected to the electrode of the temperature-sensitive resistance element, the provision of a spring 20 to press and fix the temperature-sensitive resistance element in the metal case, and the single terminal. A plate 21 is provided, and the terminals 17 and 18 are inserted through this terminal plate. Incidentally, the provision of the elastic member 15 is the same as in the case of FIG. 3. The conductive metal is formed into an arc shape or a flat plate shape and is connected to the upper end of the electrode of the temperature sensitive resistance element 5. In addition, the terminal board 21
is arranged so as to close the opening of the metal case 10,
By caulking the open end 10a' of the metal case, the terminal plate is fixed and the spring 20 is locked. And two terminals 17, 18
penetrates the terminal plate 21 and one end thereof is connected to the metal case 1.
The conductive metal 19 and the lead piece 1b are each connected to the lead wire 2.
2 and 23, and are connected by solder or the like.
In such a structure, the temperature sensing element is pressed against the inner bottom surface of the metal case by the spring 20, which makes the connection of the ground electrode of the temperature sensitive resistance element to the inner surface of the metal case more secure, and since it is a single terminal plate, It has the advantage that the number of materials is small and assembly can be simplified.

Although the temperature-sensitive reed switch used in the above embodiment was a normally closed type, a normally open type, a zone type, or other types may be used. In addition, PTC (Positive Temperature Coefficient) is used as a temperature-sensitive resistance element.
Thermister), NTC (Negative Temperature)
Coefficient Thermster)、CRT(Critical
Temperature Resistor), etc. can be adopted.

[Effects of the invention] According to the invention as described above, the temperature-sensitive resistance element and the temperature-sensitive reed switch can be integrated, the device can be miniaturized, and the temperature can be directly detected, resulting in good responsiveness and suitable for optimal control. It is possible to provide a temperature sensing element that is

[Brief explanation of drawings]

Figures 1a and b are front sectional views and left side views of a temperature sensing element showing one embodiment of the present invention, Figure 2 is an assembled sectional view of the temperature sensing element assembled in a metal case, and Figure 3 is another embodiment. FIG. 4 is a schematic sectional view showing still another embodiment, and FIG. 5 is a sectional view showing another assembly example. 1... Reed switch, 1a, 1b... Reed piece, 1c... Glass tube, 2, 3... Permanent magnet, 4
... Temperature-sensitive magnetic material, 5 ... Temperature-sensitive resistance element, 6 ... Conductive metal, 10 ... Metal case.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A temperature-sensitive reed switch in which a permanent magnet and a temperature-sensitive magnetic material are arranged on the circumferential surface of the reed switch;
A temperature sensing element comprising a plate-shaped temperature sensitive resistance element having a through hole passing through the reed switch. (2) The temperature sensing element according to claim 1, wherein the temperature sensing resistance element is in contact with the side surface of the permanent magnet of the temperature sensing reed switch via an elastic member. (3) The temperature sensing element according to claim 2, wherein the elastic member is made of a rubber material or a heat insulating material. (4) The temperature sensing element according to claim 1, wherein the temperature sensing resistance element is one of PTC, NTC, and CTR whose resistance value changes depending on temperature. (4) The temperature sensing element according to claim 1, wherein the temperature-sensitive reed switch is one of a normally closed type, a normally open type, and a band type.