JPH0735268Y2 - Temperature switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a temperature switch for opening and closing contacts at a predetermined temperature.

(Prior Art) The applicant has previously proposed Japanese Patent Application No. 62-10 as a temperature switch of this type.
No. 90 (Japanese Patent Laid-Open No. 63-24519) is proposed.

This temperature switch is composed of a heat sensitive portion having thermal expansion / contraction properties (hereinafter referred to as a heat responsive body), and a switching element which is disposed within the expansion / contraction range of the heat responsive body and operates by thermal expansion of the heat responsive body. However, a predetermined temperature can be detected by operating the switching element by the thermal expansion of the thermal responsive body due to the increase in the ambient temperature.

With this temperature switch, the thermal actuator expands or contracts in response to changes in the ambient temperature, so it can be used repeatedly regardless of the number of operations, and accurate temperature detection is possible based on the thermal expansion and contraction of the thermal actuator. It has the advantage that it can be done.

(Problem to be solved or solved) However, in the above-mentioned temperature switch, since the switching element is provided at one end side of the thermal actuator, a space for thermal expansion and contraction is required at the one end side. Since this space becomes larger as the detected temperature becomes higher, the dimensions of the temperature switch may become uneven depending on the detected temperature, or the temperature switch itself may become long in order to allow this dimensional change in appearance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a temperature switch that can keep the size of the temperature switch constant regardless of the detected temperature.

(Means for Solving the Problems) In order to achieve the above object, the present invention accommodates a thermal responsive body having thermal expansion / contraction properties and electrical conductivity, and having an operating hole at substantially the center thereof, and the thermal responsive body. And a casing having a first electrode member that comes into contact with the heat responsive body, and a casing that is inserted through the working hole of the heat responsive body in a non-contact state and is insulated from the first electrode member. A temperature switch is composed of the second electrode member fixed to the.

(Operation) According to the present invention, the heat responsive body reduces the inner diameter of its working hole as the ambient temperature rises. Due to the reduced diameter of the operating hole, the inner surface of the hole comes into contact with the second electrode member.
The second electrode member is electrically connected via the electrically conductive heat responsive body.

The temperature detected by the temperature switch can be appropriately changed by adjusting the distance between the inner surface of the actuation hole of the thermal actuator and the second electrode member.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a temperature switch, FIG. 2 is a perspective view of a thermal actuator, and FIG. FIG.

In the figure, reference numeral 1 denotes a casing, which has a storage space 2 having a circular cross section for a heat responsive body, which will be described later. This casing 1 is made of an insulating material 3 having a vertical cross-section formed of an insulating material such as resin, and a first material having a vertical cross-section formed of a conductive material such as aluminum and fitted to the opening side of the insulating material 3. It is composed of one electrode member 4. The insulator 3
A mounting hole 3a having a circular cross section, which will be described later, is formed substantially at the center of the second electrode member.

Reference numeral 5 is a columnar second electrode member formed of a conductive material such as aluminum like the first electrode member 4, and the second electrode member 5 is fitted in the mounting hole 3a. The two-electrode member 5 is in contact with one end of the two-electrode member 5 to the inner surface of the first electrode member 4 via a disc-shaped insulating member 6 made of resin or the like, and the lower end side is the lower surface of the insulator 3. Slightly protruding from.

Reference numeral 7 denotes a disk-shaped heat responsive body housed in the internal space 2 of the casing 1, and the heat responsive body 7 has a trapezoidal shape from the second electrode member 5 substantially at the center as shown in FIG. Working hole 7a
have. The thermal actuator 7 is a so-called conductive silicone, which is a material having thermal expansion / contraction properties and conductivity, such as silicone rubber in which thermal expansion / contraction linearly appears with respect to temperature changes, and an appropriate amount of carbon black or carbon fibers mixed therein. It is made of rubber. Further, in the state in which the thermal actuator 7 is housed in the casing 1, the outer peripheral surface and the upper surface thereof are in contact with the first electrode member, and the lower surface thereof is in contact with the insulator 3.
Further, the heat responsive body 7 separates the inner surface of the working hole 7a from the second electrode member 5 with a distance L1 in the radial direction thereof.

Next, the operation of the temperature switch of this embodiment will be described with reference to FIG.

When the ambient temperature rises, it is conducted to the heat responsive body 7 through the casing 1, especially the first electrode member 4, and the heat responsive body 7 expands in the casing 1. This expansion appears in the working hole 7a, which is the free end, and the inner diameter of the working hole 7a is reduced as indicated by the arrow.
The inner surface of the second electrode member 5 comes into contact with the inner surface of the
The electrode members 4 and 5 are brought into conduction through the electrically conductive heat responsive body 7.

Further, when the ambient temperature drops from the above-mentioned conductive state, heat is radiated through the casing 1, particularly the first electrode member 4, and the inner diameter of the actuating hole 7a of the heat responsive body 7 expands contrary to the above. The expanded diameter of the operation hole 7a releases the contact with the second electrode member 5, thereby releasing the conduction between the first and second electrode members 4 and 5.

As described above, in the temperature switch of the present embodiment, it is possible to change the detected temperature by adjusting the distance L1 between the inner surface of the working hole 7a and the second electrode member 5, that is, the inner diameter of the working hole 7a can be changed. If the diameter of the second electrode member 5 is enlarged or the distance L1 is increased, the detection temperature can be set higher than the above.
Further, the detection temperature can be set lower than the above by reducing the inner diameter of the operating hole 7a or increasing the second electrode member 5 to reduce the distance L1. In this case, the dimensions of the casing 1 itself are not affected at all, that is, the dimensions of the temperature switch can be kept constant regardless of the detected temperature.

In addition, since the casing 1 and the heat responsive body 7 are formed in a disk shape, it is possible to efficiently absorb the ambient heat in a large heat transfer area and transfer the heat to the heat responsive body 7, so that a predetermined temperature is maintained. It is possible to detect accurately without delay.

The first and second electrode members 4, 5 in the above embodiment may be formed of a metal or non-metal material other than aluminum as long as it has conductivity. Further, the heat responsive body 7 can also be formed of a material other than conductive silicone rubber as long as it has thermal expansion and contraction and conductivity. Further, the casing 1 and the heat responsive body 7 are not limited to the disk shape, and may be changed to various shapes such as a rectangular plate shape.

FIG. 4 shows another embodiment of the present invention in which temperature switches having different detection temperatures are arranged in two stages.

In the figure, reference numeral 11 denotes a casing, which has storage spaces 12a and 12b having a circular cross-section for heat-acting bodies in two upper and lower stages. The casing 11 includes an insulator 13 having a recess on each of the upper and lower surfaces,
It is composed of first and third electrode members 14 and 15 fitted to the opening sides of the insulator 13. The first and third electrode members 1
Mounting holes 14a and 15a having circular cross-sections for second and fourth electrode members, which will be described later, are formed in substantially the central portions of 4, 15 respectively.

Reference numerals 16 and 17 denote columnar second and fourth electrode members made of a conductive material, and the second and fourth electrode members 16 and 17 have an annular insulating member 18 in the mounting holes 14a and 15a. Are fitted in each. One end of each of the second and fourth electrode members 16 and 17 is in contact with the inner surface of the insulator 13, and the other end thereof is slightly above and below the first and third electrode members 14 and 15, respectively. It is protruding.

19.20 are disk-shaped first and second heat responsive bodies made of a material having thermal expansion and contraction and conductivity, and the first and second heat responsive bodies 19 and 20 are internal spaces of the casing 11. They are stored in 12a and 12b respectively. In addition, the first and second thermal actuators 19,2
The first and second operating holes 19a and 20a having a diameter larger than those of the second and fourth electrode members 16 and 17 are provided at substantially the center of 0. The first and second thermal actuators 19, 20 are stored in the casing 11,
One of the outer peripheral surface and the upper and lower surfaces has the first and third electrode members 14, 15
In addition, the other of the upper and lower surfaces is in contact with the insulator 13. The first thermal actuator 19 is separated from the first operating hole 19a by a distance L2 from the second electrode member 16 in the radial direction, and the second thermal actuator 20 is connected to the second operating hole 20a. Are separated from the fourth electrode member 17 by a distance L3 larger than the distance L2 in the radial direction.

Next, the operation of the temperature switch of this embodiment will be described.

The basic operation is the same as that of the above-described embodiment, that is, the inner diameters of the first and second working holes 19a and 20a of the first and second thermal actuators 19 and 20 are reduced as the ambient temperature rises. Since the distance L2 is smaller than the distance L3, the inner surface of the first working hole 19a of the first thermal actuator 19 first contacts the second electrode member 16 at a predetermined temperature, whereby the first and second electrode members 14, 16 conducts through the first heat responding body 19 which is electrically conductive. Then, at a temperature higher than the above, the inner surface of the second working hole 20a of the second thermal actuator 20 contacts the fourth electrode member 17, which causes the third and fourth electrode members 15 and 17 to be electrically conductive. (2) Conductivity is established via the heat responsive body 20.

Also, as the ambient temperature drops, the first and second working holes 19a,
The inner diameter of 20a expands contrary to the above, and the continuity of each is released.

The effects exhibited by this embodiment are the same as those of the previous embodiment.

(Effect of the Invention) As described above, according to the present invention, it is possible to change the detected temperature by adjusting the distance between the inner surface of the working hole of the heat responsive body and the second electrode member. That is, if the inner diameter of the working hole is enlarged or the second electrode member is made smaller to increase the distance, the detection temperature can be set higher, and the inner diameter of the working hole is reduced or the second electrode member is made larger. Since the detection temperature can be set low by decreasing the interval by the above, there is an advantage that the size of the temperature switch can be kept constant regardless of the detection temperature.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a temperature switch, FIG. 2 is a perspective view of a thermal actuator, FIG. FIG. 4 is a vertical sectional view of a temperature switch showing another embodiment of the present invention. 1,11 …… Casing, 4,14 …… First electrode member, 5,16 ……
Second electrode member, 7 ... Thermal actuator, 7a ... Operating hole, 15 ...
3rd electrode member, 17 ... 4th electrode member, 19 ... 1st thermal response body, 19a ... 1st actuation hole, 20 ... 2nd thermal response body, 20a.
Second working hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Miyakoshi 6972 Shimoyoshida, Yoshida-cho, Chichibu-gun, Saitama Prefecture Taisei Co., Ltd. (72) Creator Teruo Okano 1-8-10, Kashiwa, Honjo, Saitama Prefecture (72) Creator Kanemori Misuku 3-1-9-302 Wada, Tama City, Tokyo (56) References JP 54-50971 (JP, A) JP 1-95430 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A thermal responsive body having thermal expansion / contraction properties and conductivity, and having a working hole at substantially the center thereof, and a first electrode member for accommodating the thermal responsive body and contacting the thermal responsive body. And a second electrode member that is inserted into the actuation hole of the thermal actuator in a non-contact state and is fixed to the casing while being insulated from the first electrode member. Characteristic temperature switch.