JPS5953051B2 - Cooker heat sensitive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive device for a cooker that detects the temperature of the outer bottom surface of a heating container and operates a control unit at a set temperature. To provide a heat-sensitive device which is superior in that it lowers the heat to low heat before the rice cooking is completed and continues cooking the rice to complete the rice cooking.

Conventionally, a heat-sensitive device 1 as shown in FIG. 1 has been used.

That is, there is a heat receiving part 2 made of an aluminum plate, and inside the heat receiving part 2, soft flights 3 and 3' made of soft magnetic iron oxide with different Curie points I are placed in close contact with the heat receiving part 2 with a ferrite cover 4, and a cylindrical shape is formed. The heat receiving part 2 is fixed to the upper edge of the case 5 by caulking with a circumferential edge 2-1.

Permanent magnets 6, 6' that attract or detach from soft ferrites 3, 3' correspond to soft ferrites 1-3, 3', respectively,
Heat sensitive device rod 8 connected to magnet yoke 7.7'
, 8' actuate other gas control members (prior art not shown).

In addition, in the conventional heat-sensitive device, the aluminum heat-receiving portion 2 receives heat from the outer bottom surface of the heating container, and then the heat is transferred to the soft ferrite 3° 3' closely located inside.

Furthermore, since the rough 1 to ferrite 3.3' are held down by the ferrite cover 4, there is some variation in the contact with the soft ferrite.

Rough 1 - Ferrite 3.3' itself is easily broken by impact and warps during firing, so it is thick at 2 to 3 mm, cannot be made large in area, and unlike metals has poor thermal conductivity. There are several drawbacks, especially cracking, which is the biggest quality problem for thermal devices.

The present invention overcomes the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below.

FIG. 2 is a detailed view of the heat-sensitive device 9. The heat-receiving part 10 is made of a soft magnetic alloy consisting of iron, nickel, and chromium. Soft magnetic alloy pieces 11 having different Curie points are joined.

Permanent magnets 12 and 12' are provided so as to be able to attract the heat receiving part 10 and the soft magnetic alloy piece 11, which are made of a soft magnetic alloy, respectively.

The permanent magnets 12 and 12' are provided with yokes 13 and 13' for the purpose of increasing the strength of the magnetic force and to prevent direct contact with the heat receiving plate 10 and the soft magnetic alloy piece 11, and the permanent magnets 12 and 12'
is fixed to the yoke 13.13' by a cover 14.14'.

Heat sensitive device rods 15, 15' are connected to the opposite side of the suction surface of the yoke 13.13'.
There are rod springs 16, 16' and spring receivers 17, 17' around the periphery, and the main lever 18,
The tips of 19 are connected and the lever is prevented from being pulled out 20, 20'
are provided for each.

Reference numeral 21 denotes a case which is closed at the outer edge 22 of the heat receiving section 10 and constitutes the heat sensitive device 9.

FIG. 3 is a functional diagram of a gas rice cooker using the heat-sensitive device 9.

That is, the heat-sensitive device 9 is located below the rice cooker 23, and the heat-receiving section 10
The soft magnetic alloy directly contacts the bottom of the rice cooker 23 and receives heat.

Now, when the water in the rice cooker 23 runs out and the temperature reaches, for example, 110°C, the heat receiving part 10 made of soft magnetic alloy loses most of its magnetic permeability at 110°C and the permanent magnet 12 comes off from the heat receiving part 10.
4, the main lever 18 is lowered and the main valve 25 is closed.

However, half the amount of gas flows from the orifice 26 of the main valve 25 when it is fully open, passes through the main valve 27, and continues combustion in the main burner 28 and ignition burner 29.

Eventually, when the bottom of the rice cooker 23 reaches about 145°C, the soft magnetic alloy piece 11 loses almost all its magnetic permeability, and the permanent magnet 12
' is removed, the main lever 19 is lowered, the main valve 27 is closed, the main burner 28 and the ignition burner 29 are extinguished, and the heat retention burner 31 is burned only by opening the heat retention valve 30, causing unevenness 1.
It lasts from 0 to 15 minutes.

After heating, the heat retaining lever 32 is raised to close the heat retaining valve 30 and completely extinguish the gas.

The heat sensitive device 9 used for the above action has the following effects.

In the present invention, unlike the conventional one, the heat receiving part 10 is made of a rapidly soft magnetic alloy, so that heat reception is sensitive.

1. The other soft magnetic alloy piece 11 can be spot welded or silver soldered to the heat receiving part 10, and has very good heat conduction by direct joining of metals or by joining with a metal with good heat conduction.

Furthermore, as mentioned above, soft magnetic alloys can be welded together, and no other fixing fittings are required.

Soft magnetic alloys are difficult to crack, which is the weakest point of soft ferrite, which is a soft magnetic iron oxide.

In addition, soft magnetic alloys have many features such as excellent workability as they can be made thin or thick and can be press-formed.

Therefore, a heat-sensitive device utilizing this feature has excellent performance economically and in terms of quality.

In addition, when using a plurality of soft magnetic alloys, the heat receiving part 10 is based on a soft magnetic alloy with a low Curie point as in the above example, and other soft magnetic alloy pieces 11 with a high Curie point are welded together. I can say that.

Therefore, there is no need for a separate heat receiving member and no need for a pusher.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional heat-sensitive device, FIG. 2 is a cross-sectional view of a heat-sensitive device of a cooking appliance according to an embodiment of the present invention, and FIG. 3 is a functional diagram of the use of the heat-sensitive device. 9... Heat sensitive device, 10... Heat receiving section, 1
1... Soft magnetic alloy piece, 12.12'...
・Permanent magnet, 23...Rice pot (heating container).

Claims (1)

[Scope of Claims] 1. In a heat-sensitive device for a cooker that detects the temperature of the outer bottom surface of a heating container and operates a control section, the heat receiving part of the heat-sensitive device in contact with the outer bottom surface of the heating container is made of soft magnetic material having a set Curie point. It is made of an alloy, and furthermore, one or more soft magnetic alloy pieces having Curie points 1 to 1 different from those of the light-heating part are fixed inside thereof, and are attracted and detached in correspondence with the heat receiving part and other soft magnetic alloy pieces. 1. A heat-sensitive device for a cooker, comprising a control member equipped with a plurality of permanent magnets. 2. The heat-sensitive device for a cooker according to claim 1, wherein the Curie point of the soft magnetic alloy of the heat receiving part is lower than that of other soft magnetic alloy pieces.