JPS6193924A - Heat sensitive sensor - Google Patents

Abstract

PURPOSE:To reduce cost by providing an auxiliary permanent magnet which repulses to and detaches from the other end of a yoke piece at the specific temp. specified from a heat sensitive magnetic material plate or above and is attracted to the other end of the yoke piece in the temp. region lower than the specific temp. CONSTITUTION:The heat sensitive magnetic material plate 4 is a paramagnetic material at above the Curie temp. of heat sensitive soft ferrite constituting the plate 4. The magnetic flux density which only the main permanent magnet 1 exerts to a yoke piece 2 is an arrow Bd1 at the end of the yoke piece and the magnetic flux density that only the auxiliary permanent magnet 6 exerts to the yoke piece 2 is an arrow Bd2. The Bd1 and Bd2 face opposite from each other as shown and the magnet 6 is held detached in the case of Bd1>Bd2. A traveling contact 7 descends and the electrical connection between fixed contacts 8A, 8B is on. On the other hand, the plate 4 acts as a ferromagnetic material in the temp. region lower than the Curie temp. of the heat sensitive soft ferrite constituting the plate 4. The magnetic flux density Bd2 by the magnet 6 is in the same direction as the density Bd3 by the magnet 1 and the connection between the contacts 8A and 8B is off.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a temperature-sensitive sensor that uses the Curie temperature of a temperature-sensitive magnetic material, and particularly relates to a type of temperature-sensitive sensor that does not use a reed switch.

(Prior Art and Problems) A temperature-sensitive reed switch is conventionally known as one that utilizes the cue temperature of a temperature-sensitive magnetic material.

This temperature-sensitive reed switch uses a reed switch whose contacts are lath-sealed, so it has the disadvantage of being expensive. Furthermore, if the switching current of the reed switch contacts is large, chattering occurs when the contacts open and close. Therefore, as a temperature-sensitive reed switch, a contact switching voltage of 100 to 150 V (1C or AC) and a contact switching current of 0.5 to 0.7 A are the limit values of the usable range. In addition, the applicable temperature range is -20 to 2, which will not cause temperature damage to the reed switch.
Limited to 00°C. Furthermore, reed switches used as temperature-sensitive reed switches are required to have small variations in contact operation, and their manufacturing yields are also poor (1), so they must be used selectively (in this respect, too, they are expensive). This led to price increases.

(Means for Solving the Problems) In view of the above points, the present invention provides a main permanent magnet having magnetic poles formed on both end faces, and a January yoke piece arranged on each of the magnetic pole faces of the main permanent magnet. Note: The temperature-sensitive magnetic material plate is provided to bridge one end of a pair of yoke pieces, and a sub-permanent magnet is arranged at the other end of the yoke piece. The object of the present invention is to provide a temperature-sensitive sensor that enables temperature detection operations such as turning on and off contacts by utilizing the attracting and detaching operations of the sub permanent magnet according to the Curie temperature of the magnetic plate. .

(Example) Hereinafter, an example of the temperature sensor according to the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the present invention, FIG. 1 shows a state in which the sub permanent magnet is detached, and FIG. 2 shows a state in which the sub permanent magnet is attracted. In these figures, yoke pieces 2 made of iron or the like are closely fixed to both magnetic pole surfaces of a main permanent magnet 1 having magnetic poles formed on both end surfaces. A temperature-sensitive magnetic plate 4 made of 7-elite is fixedly arranged so as to be in contact with one end surface of the pair of yoke pieces 2 to bridge both yoke pieces. A sub permanent magnet 6 is arranged at the other end of the yoke piece 2 so as to face the end face thereof, and the sub permanent magnet 6 has two poles, an N pole and an S pole, on the face facing the yoke piece 2. It is formed.

That is, the N pole of the sub permanent magnet 6 is set to face the N pole side yoke piece of the main permanent magnet 1. The auxiliary permanent magnet 6 is movably supported within the range of a state where it is attracted to the yoke piece 2 and a state where it is separated from the yoke piece 2 by a certain distance in terms of rock structure. A movable contact point is connected therebetween. Also possible F5J]
Fixed contacts 8A and 8B are arranged facing the contact point. The switch unit 0 consists of an auxiliary permanent magnet 6, a movable contact 7 connected to the sub-permanent magnet 6 through an insulating resin 9, and fixed contacts 8A and 8B.

(Operation of Example) Next, the operation of the temperature sensor shown in the first example will be explained. First, above the Curie temperature of the temperature-sensitive soft ferrite constituting the temperature-sensitive magnetic plate 4, the temperature-sensitive magnetic plate 4 becomes a paramagnetic material.

In this case, the magnetic flux density that only the main permanent magnet 1 exerts on the yoke piece 2 is Bcl at the end of the yoke piece, and its direction is as indicated by the arrow in FIG. In addition, the sub permanent magnet 6
If the magnetic flux density given to the yoke piece 2 by the chisel is Bd2, then
Its direction is as shown by the arrow in the figure. At this time, the direction of the magnetic flux density B cl + due to the main permanent magnet 1 is opposite to the magnetic flux density Bd due to the sub permanent magnet 6, as shown by the arrow in FIG. As a result, when the condition of B cL > B d2 is satisfied, the magnetic flux vectors of Bdl and Bd2 are opposite, so the sub permanent magnet 6 is connected to the temperature-sensitive magnetic plate 11.
When Pt becomes a paramagnetic material, it enters a detached state as shown in the Pt51 diagram. (When the 71J Mizuku magnet 6 is in the wild state, the movable contact 7 interlocked with it is lowered, so the electrical connection between the fixed contacts 13A and 8B is turned on.

On the other hand, in a temperature range lower than the Curie temperature of the temperature-sensitive soft 7 elite constituting the temperature-sensitive magnetic plate 4, the temperature-sensitive magnetic plate 4 acts as a ferromagnetic material, and the magnetic flux density in the yoke caused by the main permanent magnet 1 is is 13d3 in the direction of the arrow in FIG. There is an absorption between the magnetic poles
As a result, the sub permanent magnet 6 is attracted to the rear end of the yoke piece in correspondence with the ferromagnetic material of the temperature-sensitive magnetic plate 4. When the auxiliary permanent magnet 6 is in the attracted state, the movable contact 7 moves upward in conjunction with this, and therefore the electrical connection between the fixed contacts 8A and 8B is turned off.

That is, when the operating temperature of the temperature sensor is Td and the temperature of the temperature sensitive soft 7 elite forming the temperature sensitive magnetic plate 1 is Tc, it is turned on when Td≧Tc, and turned off when Td<Tc. .

In addition, the magnetic flux density in the yoke piece 2 is Bcl-10Dd,
However, it is preferable that the tip position is not far from the saturation magnetic flux density Bs.

If the yoke piece 2 is magnetically saturated, even if the temperature-sensitive magnetic plate 4 is a ferromagnetic material, the magnetic flux toward the rear end of the yoke piece in the opposite direction to the magnetic flux density Bd as shown in FIG. Density Bd4
exists, and in such a state Bc
When i,>Bcl, a repulsive force is generated at the rear end of the yoke piece, and the water-filled magnet 6 of C11 is not attracted.

Therefore, as shown in Figures 1 and 2, the temperature-sensitive magnetic material &
Temperature-sensitive magnetic material is used so that the auxiliary permanent magnet 6 of the switch part 10 detaches when the temperature is higher than the temperature of the temperature-sensitive software 7 elite that constitutes 4, and the auxiliary permanent magnet 6 of the switch section 10 is attracted when the temperature is lower than the temperature. In order to make the paramagnetic state and ferromagnetic state of the plate 4 and the movement of the sub permanent magnet 6 correspond to 1:], the following conditions must be satisfied: Bd > Bd2, and whether the yoke piece 2 is not magnetically saturated or not. It can be seen that even if there is, the condition that the magnetic flux density Bd toward the rear end, <Bd, must be satisfied.

According to the first embodiment, whether the temperature-sensitive magnetic plate 1 is in a ferromagnetic state or a paramagnetic state: the other 41 part of the yoke piece 2 corresponds to the ratio of 1:1. Long, magnet 6 is 1■
It is decided to approach and separate, and after moving using the movement of the total j water magnet: 56, α7 and fixed contact 3A.

It is possible to perform on/off operations with 8B, thereby making it possible to precisely detect whether the ambient temperature (operating temperature) is equal to or higher than the Curie temperature of the temperature-sensitive magnetic material &j.4. Also, since there is no need to use a reed switch,
It is possible to lower the price, and if necessary, the current capacity of the contact can be increased.

Furthermore, by making full use of the temperature-sensitive soft ferrite's Curi +jH'1 degree 1'5 degree range, the detected temperature can be adjusted from -40 to 5 degrees.
() It is possible to extend the temperature range to about 10°C.

Ru.

(Other Examples and Supplementary Explanation) In the first example, the sub permanent magnet 6 has a single-sided bipolar structure and can be brought into close contact with the rear end surface of the yoke piece 2. Such a structure is a suitable addition when the main permanent magnet 1 and the auxiliary permanent magnet 6 are made of the same material, for example, both are 7-grade light magnets or both are rare earth magnets, but the auxiliary permanent magnet is not necessarily located behind the yoke piece. It is not necessary to have a structure that allows close contact with the end face, and a predetermined interval may be provided.

Figure 0'S4 shows a second embodiment of the present invention, in which a sub permanent magnet 6A with magnetic poles formed on both end faces is used, and a 1"J magnet is used on the inner surface of the N pole side yoke piece of the main permanent magnet 1. Note that the structure of the temperature-sensitive magnetic body Fj, 4 is such that a movable contact 7 is connected to the sub-permanent magnet 6A, and a fixed contact 8A is opposed to the movable contact 7.

The configuration in which the 8B is provided may be the same as in the first embodiment described above.

FIG. 5 shows an ff53 embodiment of the present invention. In this case, the configuration of the switch section 10 incorporating the main permanent (J'i stone 1, yoke piece 2, and sub permanent magnet 6) is the same as that of the first embodiment described above, but the structure of the temperature-sensitive magnetic plate is different. In other words, the temperature-sensitive magnetic plates 4A are manufactured with a precision that is several times as large as the spacing between the yoke pieces 2, and for example, as shown in FIG.・゛・・、
80°CS 90°C, I
It is arranged so as to be able to freely slide on one end surface of the.

In this third embodiment, if the temperature-sensitive magnetic plate 4A is slid as shown by the arrow S and the pair of yoke pieces 2 are rated at t5 with a specific temperature-sensitive soft ferrite, then the specific temperature-sensitive soft ferrite is Switch part 1 at 11υ"-
0 or it will operate. As a result, by excessively selecting the temperature-sensitive soft 7elite bridging the pair of yoke pieces 2 by the sliding operation, the detected temperature can be adjusted in stages from ()°C to 10°C (1"C). It can be changed.

(Effects of the Invention) As explained above, according to the temperature sensor of the present invention,
A main permanent magnet having magnetic poles formed on both end faces, a pair of yoke pieces arranged respectively on the magnetic pole faces of the main permanent magnet, and one end of the pair of yoke pieces are provided so as to bridge each other. The configuration includes a temperature-sensitive magnetic plate and a sub-permanent magnet disposed at the other end of the yoke piece, and the sub-permanent magnet attracts and detaches according to the temperature of the temperature-sensitive magnetic woodblock. By using this, it is possible to perform temperature detection operations such as turning on and off a contact, for example. Furthermore, since there is no need to use a reed switch, the cost can be reduced, and the current capacity of the contact can be increased if necessary. moreover,
It is possible to extend the detected temperature to a temperature range of -/IO to about 500°C by making full use of the temperature range of the temperature-sensitive software 7Elite and the like. Furthermore, it is possible to directly apply the attracting and disengaging actions of the sub-permanent magnet to the opening and closing force of the rock valve.

[Brief explanation of the drawing]

Fig. fjS1 is a side sectional view showing the first embodiment of the temperature sensor according to the present invention, showing the sub permanent magnet detached state, Fig. 2 is a side sectional view showing the sub permanent magnet adsorption state, and Fig. 3 is the yoke. An explanatory diagram showing the magnetic flux density and its direction when magnetic saturation occurs in the piece. Figure 5 is a 111 cross-sectional view showing the second embodiment of the present invention. Figure 5-1 is a third embodiment of the present invention. FIG. 613 is a perspective view showing an example; 1... Main permanent magnet, 2... Yoke piece, 4, 4 A
...Temperature-sensitive magnetic plate, 6,6A... Sub-permanent magnet, 7.
・・Movable contact, 8 A, 8 B・・Fixed contact, 10・
...Sinch part.

Claims (4)

[Claims] (1) A main permanent magnet having magnetic poles formed on both end faces, a pair of yoke pieces respectively arranged on the magnetic pole faces of the main permanent magnet, and a pair of yoke pieces arranged to bridge one end of the pair of yoke pieces. The temperature-sensitive magnetic plate is repelled from the other end of the yoke piece at a temperature higher than a specific temperature defined by the temperature-sensitive magnetic plate, and detaches from the other end of the yoke piece in a temperature range lower than the specific temperature. A temperature-sensitive sensor characterized by comprising a sub-permanent magnet that is attracted to an end. (2) The temperature sensor according to claim 1, wherein the auxiliary permanent magnet has a single-sided bipolar structure and has an N pole facing an end face of the N-pole side yoke piece of the main permanent magnet. sensor. (3) The auxiliary permanent magnet has a structure in which magnetic poles are formed on both end faces, and has an N pole facing the inner surface of the N-pole side yoke piece of the main permanent magnet. Temperature sensor described in section. (4) The temperature-sensitive magnetic material plate is a combination structure of a plurality of temperature-sensitive magnetic materials having different Curie temperatures, and is slidable on one end of the yoke piece. Temperature sensor as described.