JPS6137172Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a thermally responsive device in which a temperature-sensitive magnetic material and a permanent magnet are configured to attract or separate from each other in accordance with changes in the magnetism of the temperature-sensitive magnetic material.

This type of thermal response device consists of a temperature-sensitive part in which a temperature-sensitive magnetic material having a Curie point corresponding to the detected temperature is fixed to the heat-receiving part to be placed in the detected part, and a permanent magnet in the inner bottom of a dish-shaped yoke. with the drive part fixed to the
A spring member is interposed between these so that the driving part moves away from the temperature sensing part when the temperature of the temperature-sensitive magnetic body exceeds its Curie point, and an operating rod is connected to the displacement of the driving part. A thermally responsive device that can extract mechanical force through a thermal reactor is common.

The present invention attempts to provide a thermally responsive device that detects not only the temperature of the detected part but also the temperature of its surroundings and operates only when both temperature conditions are satisfied.

The present invention will be explained below with reference to the drawings.

FIGS. 1 and 2 are longitudinal sectional views showing an embodiment of the present invention when a permanent magnet is attracted and separated, respectively.

In the figure, a temperature-sensitive magnetic material 3 having a Curie point Tc ₁ corresponding to the operating temperature is fixed to the lower surface of a heat receiving plate 2 constituting a lid plate of a bottomed cylindrical case 1 with an opening 1a in a part of the side wall. has been done. On the lower surface side of the temperature-sensitive magnetic body 3, an annular permanent magnet 4 is fixed to the inner bottom surface of a dish-shaped yoke 5 having an inner diameter larger than the outer diameter of the temperature-sensitive magnetic body 3, and faces the temperature-sensitive magnetic body 3. A coil spring 6 is inserted between the inner bottom surface of the yoke 5 and the temperature-sensitive magnetic body 3 to separate them.

Figures 3 and 4 are similar to Figures 1 and 2, respectively.
An embodiment of the present invention corresponding to the state shown in the figure is a heat receiving plate 2.
It is a perspective view which abbreviate|omits.

On the outer wall of the yoke 5 facing the opening 1a of the case 1, an auxiliary permanent magnet 7 is fixedly arranged within a sideways U-shaped yoke 8 with its magnetization direction aligned with the radial direction of the yoke 5. Close to the magnetic pole surface of the magnet 7 and the open end surface of the yoke 8, the temperature-sensitive magnetic material 3 has a Curie point lower than the Curie point Tc ₁ , for example, near room temperature.
A second temperature-sensitive magnetic body 9 having Tc ₂ is provided. The thin shaft portion 101 of the operating rod 10 is inserted into the center hole of the magnet 4 and the hole provided in the bottom wall of the yoke 5, and the thin shaft portion 101 is inserted into the recess 41 at the center of the upper part of the magnet 4.
Tighten the nut 11 to the threaded part formed in 01,
The magnet 4, yoke 5, and operating rod 10 are integrated. The operating rod 10 has a coil spring 12 that is fixed to the operating rod 10 at one end and to the case 1 at the other end.
is fitted loosely, and a locking piece 13 is provided protruding from the outer portion of the case 1. Also case 1
A guide plate 14 for regulating the displacement of the locking piece 13 is provided on the bottom wall of the holder.
and a vertical groove 14 that restricts the vertical movement of the locking piece 13.
2 is formed to restrict the rotational movement and vertical movement of the magnet 4 and yoke 5 that move integrally with the operating rod 10.

In this embodiment, the biasing force of the coil spring 6 and the position when the magnet 4 is separated from the temperature-sensitive magnetic body 3 are respectively set at the Curie point Tc ₁ of the temperature of the temperature-sensitive magnetic body 3.
It is set so that the magnet 4 separates from the temperature-sensitive magnetic body 3 only when the temperature-sensitive magnetic body 3 is exceeded, and when the temperature-sensitive magnetic body 3 returns to ferromagnetism, it automatically returns to the position where it attracts the temperature-sensitive magnetic body 3 by magnetic attraction force. are doing. In addition, the biasing force of the coil spring 12 and the position when the magnet 7 is displaced from the temperature-sensitive magnetic body 9 are respectively calculated such that the magnet 7 separates from the temperature-sensitive magnetic body 9 only when the temperature of the temperature-sensitive magnetic body 9 is Tc ₂ or higher. When the temperature of the temperature-sensitive magnetic body 9 falls below Tc ₂ , the magnet 7 is set to return to the position facing the temperature-sensitive magnetic body 9 due to the magnetic attraction force. .

In this way, when the ambient temperature is less than the Curie point Tc ₂ of the temperature-sensitive magnetic material 9, even if the temperature of the heat receiving part, that is, the temperature of the temperature-sensitive magnetic material 3 changes from less than Tc ₁ to Tc ₁ or more, the As shown in FIG. 3, the auxiliary magnet 7 and the temperature-sensitive magnetic body 9 are in a state facing each other due to magnetic attraction, and the locking piece 13 is locked by the engagement step portion 141, so that the operating rod 10 That is, the magnet 4 cannot be lowered and does not operate in response to heat.

Furthermore, when the ambient temperature becomes Tc ₂ or more, the magnet 4 is attracted to the temperature-sensitive magnetic body 3 when the temperature of the temperature-sensitive magnetic body 3 is less than Tc ₁ , but the temperature-sensitive magnetic body 9 becomes paramagnetic and the auxiliary magnet 7 Since the magnetic attractive force with the coil spring 12 disappears, a rotational force is applied in the clockwise direction in FIG. rotates until it abuts against the upper side wall of the vertical groove 142. In addition, when the temperature of the temperature-sensitive magnetic body 3 reaches Tc ₁ or more, the locking piece 13
is removed from the engaging stepped portion 141 by the action of the coil spring 12 and is in a state where it can move up and down as it comes into contact with the side wall of the vertical groove 142. 2 and 4, and the position is displaced to the state shown in FIGS. 2 and 4.

In this way, it is a thermally responsive device that operates only when the ambient temperature is equal to or higher than the Curie point Tc ₂ of the second temperature-sensitive magnetic body 9 and the temperature of the heat-receiving part is equal to or higher than the Curie point Tc ₁ of the temperature-sensitive magnetic body 3.

Now, the situation shown in Figure 4, that is, the ambient temperature is
To recover from a state where the temperature of the heat receiving part is Tc ₂ or more and the temperature of the heat receiving part is Tc _{1 or} more, first, when the temperature of the heat receiving part falls below Tc ₁ while the ambient temperature is Tc 2 or more, as shown in Fig. 5, the magnet 4 is The magnet 4 automatically returns to the position where it attracts the temperature-sensitive magnetic body 3, and while the locking piece 13 is in the vertical groove 142, if the temperature of the heat receiving part exceeds Tc ₁ again, the magnet 4 separates from the temperature-sensitive magnetic body 3. The movement and return movement can be repeated.

In addition, when the ambient temperature drops to less than Tc ₂ after the temperature of the heat receiving part falls below Tc ₁ , the auxiliary magnet 7 becomes thermosensitive magnetic due to the magnetic attraction force while the magnet 4 remains attracted to the temperature sensitive magnetic body 3. It rotates in the counterclockwise direction in the figure to a position facing the body 9, and the locking piece 13 also returns to the state shown in FIG.

By the way, if the ambient temperature falls below Tc ₂ before the temperature of the heat receiving part falls, the auxiliary magnet 7 tries to rotate counterclockwise in the figure, but the locking piece 13 is located at the lower part of the vertical groove 142. Therefore, the locking piece 13 is in the vertical groove 1.
It remains in contact with the lower side wall of 42.
However, if the heat-receiving part temperature continues to fall below Tc ₁ , the magnet 4 attracts the temperature-sensitive magnetic body 3 and the auxiliary magnet 7 returns to the position facing the temperature-sensitive magnetic body 9, as described above.

The gap d created between the temperature-sensitive magnetic body 3 and the magnet 4 when the magnet is attracted as shown in FIG. 1 is one measure to reduce rotational distortion during rotational operation.
As another measure, as shown in the figure, the open end portion of the dish-shaped yoke 5 can be made at an acute angle to reduce the damage caused by contact between the yoke 5 and the heat receiving plate 2.

As described above, in the thermally responsive device according to the present invention, the self-returning thermally responsive operation by the reciprocating motion of the magnet 4 is performed only when the temperature of the second temperature-sensitive magnetic body 9 is equal to or higher than its Curie temperature _Tc2 .

FIG. 6 schematically shows an example in which the thermal response device according to the present invention is applied to plate temperature control of an oil hot air heater.

This thermal response device 15 includes a metal plate 1 in which the temperature-sensitive magnetic body 3 in FIG. 1 constitutes a heat exchanger.
The second temperature-sensitive magnetic body 7 is installed to detect the temperature of the warm air heated by the metal plate 16.

FIG. 7 shows a temperature curve obtained only by conventional plate temperature control, and FIG. 8 shows a temperature curve obtained by plate temperature control which also includes hot air temperature detection according to the present invention.

At the time of initial operation, the temperature of the plate generally rises first, and the temperature of the hot air is delayed. As a result, in the conventional device, the temperature of the hot air rises and falls several times before reaching the set temperature. However, with the device of the present invention, the hot air temperature reaches the set temperature during the first temperature rise process, and it is clear that a stable hot air temperature can be obtained in a shorter time than with the conventional device.

As described above, according to the present invention, it is possible to provide a thermally responsive device that performs multiple temperature monitoring.

In the embodiment, a self-return type thermal response device has been described, but the configuration of the present invention can also be applied to a non-reset type thermal response device in which the return operation is performed manually via the operating rod 10. Modifications such as providing the locking piece 13 on the periphery of the bottom surface of the yoke 5 or changing the installation position of the guide plate 14 to provide the locking piece 13 on the yoke 5 are optional.

[Brief explanation of the drawing]

Each of the drawings shows an embodiment of the thermally responsive device according to the present invention, and FIGS. 1 and 2 are longitudinal cross-sectional views showing the permanent magnet when it is attracted and separated, respectively, and FIGS. FIG. 6 is a schematic diagram of a combustion unit of an oil hot-air heater equipped with the thermal response device of the present invention, and FIGS. 7 and 8 are respectively, FIG. 4 shows operational characteristic diagrams of heaters using a conventional thermally responsive device and a thermally responsive device of the present invention. In the figure, 1... Case, 2... Heat receiving plate, 3... Temperature-sensitive magnetic material, 4... Permanent magnet, 5... Dish-shaped yoke,
6...Coil spring, 7...Auxiliary permanent magnet, 9...
Second temperature-sensitive magnetic body, 10... Operating rod, 12... Coil spring, 13... Locking piece, 14... Engagement step member, 15... Thermal response device, 16... Metal plate.

Claims (1)

[Scope of utility model registration request] A temperature-sensing section in which a temperature-sensitive magnetic material having a first Kyrie point is fixed to the heat-receiving section, and a driving section in which a permanent magnet is fixed to the inner bottom of a dish-shaped yoke are placed between the temperature-sensing section and the driving section. In the thermal response device, the permanent magnet is configured to be capable of attracting and retracting from the temperature-sensitive magnetic material by interposing a spring member, and an auxiliary permanent magnet is attached to the side or bottom periphery of the yoke so that the magnetic pole axis is aligned in the radial direction of the yoke. A second magnet, which is lower than the first Curie point, is fixed to the outer magnetic pole face of the auxiliary permanent magnet.
a second temperature-sensitive magnetic body having a Curie point of Further, a guide plate is provided opposite to the locking piece to restrict rotation and vertical movement of the drive unit, and the drive unit is configured to operate only when the temperature of the second temperature-sensitive magnetic body is equal to or higher than the second Curie point. A heat-responsive device characterized by enabling thermally-responsive operation of a part.