JPH08238167A - Rice cooker - Google Patents

Abstract

PURPOSE: To improve the cleaning property of an inner container, simplify the structure, and reduce the cost by forming the inner container storing an inner pot into a flat shape having no opening hole and no irregularity, fitting a bottom section temperature detecting device to it, and providing a cover section temperature detecting device detecting the temperature of a cover body on the cover body. CONSTITUTION: An inner pot 2 containing an object to be cooked for heating and cooking it is stored in the inner container 3 of the outer frame 1 forming the external appearance of a rice cooker, the inner container 3 is formed into a pan shape having no opening section and no irregularity at the bottom section, and the thickness of the bottom section is made thinner than that of the other portion. A bottom section temperature detecting device 5 fixed with a temperature detecting element by a fixing plate is provided on the back face of the bottom section. A cover body temperature detecting device 8 is provided on the heat radiating plate 7a of a cover body 7 covering the upper opening section of the inner pot 2. A controller 6 controls the high-frequency current to an induction heating coil 4 fitted beneath the inner container 3 based on the temperature information of the bottom section temperature detecting device 5 and the cover body temperature detecting device 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker in which an object to be cooked is put into an inner pot and cooked by heating.

[0002]

2. Description of the Related Art Generally, as a rice cooker for putting food to be cooked in an inner pot for heating, a rice cooker having a structure as shown in FIG. 3 is known. In FIG. 3, 1 is an outer frame, 2 is an inner pot, 3 is an inner container that houses the inner pot 2 and constitutes the inner surface of the container, 4 is an induction heating coil, and 5 is an inner pot attached to the bottom of the inner container 2.
Bottom temperature detecting device for detecting the temperature of the induction heating coil, 6 controls the high frequency current to the induction heating coil 4 based on the temperature information from the bottom temperature detecting device 5, and 7 covers the upper opening of the inner pot 2. It is a lid. The bottom temperature detecting device 5 is attached to an opening at the center of the bottom of the inner container 3, is biased upward by a spring 5d, and is in contact with the bottom of the inner pot 2. (For example, Japanese Utility Model Laid-Open No. 5-48818) FIG. 4 is an enlarged cross-sectional view of the vicinity of the bottom temperature detection device 5. The bottom temperature detecting device 5 includes a temperature detecting element 5a, a heat receiving plate 5c made of metal such as aluminum having good thermal conductivity, which contacts the inner pot 2,
It is composed of a fixing plate 5b for fixing the temperature detecting element 5a so as to press it against the heat receiving plate 5c, and a substantially cylindrical case 5e having a hooking portion for the spring 5d. The temperature detecting element 5a and the fixed plate 5b are structured to be sandwiched between the case 5e and the heat receiving plate 5c. The heat receiving plate 5c is fixed by swaging so that the shoulder portion of the case 5e is rolled up.

The operating controller 6 controls the high-frequency current to the induction heating coil 4 by performing temperature control during preheating, determination of the amount of cooked rice, detection of dry-up, etc. based on information from the bottom temperature detection device 5.

[0004]

In the rice cooker having the above-described structure, the bottom temperature detecting device 5 is attached to the opening at the center of the bottom of the inner container 3 and is urged upward by the spring 5d. Therefore, the cleaning performance is poor, and since there is an opening at the center of the bottom of the inner container 3, foreign matter such as rice grains and water may enter the inside of the main body, so there is a problem that a waterproof structure or the like must be considered. It was

Further, the bottom temperature detecting device 5 has a complicated structure because it requires a heat receiving plate 5c, a fixing plate 5b, a case 5e, a spring 5d and the like in addition to the temperature detecting element 5a.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and a bottom temperature detecting device is attached to an inner container for accommodating an inner pot in a flat shape without opening holes and irregularities. At the same time, the lid is provided with a lid temperature detecting device for detecting the temperature of the lid, and the control part energizes the induction heating coil based on the temperature information of the bottom temperature detecting device and the lid temperature detecting device. Is.

Further, the plate thickness of the bottom of the inner container to which the bottom temperature detecting device is attached is made thinner than the other parts.

[0008]

By virtue of the above-described structure, the inner container for accommodating the inner pot does not have openings or irregularities on the inner surface thereof, so that the rice cooker can be cleaned easily and has a neat appearance. Further, since the bottom temperature detecting device is configured to attach the temperature detecting element directly to the bottom surface of the bottom of the inner container, a case, a spring, and other parts are not required in addition to the temperature detecting element as in the conventional configuration, so that the configuration is simplified. The cost can be reduced.

Further, in the rice cooker of the present invention, since the bottom temperature detecting device detects the temperature of the inner pot through the inner container,
Since the control unit makes the temperature control during preheating a cycle of constant energization, the amount of rice cooked is determined by the lid temperature detection device, and only the dry-up detection is determined based on the temperature information of the bottom temperature detection device.
You can control rice cooking as before.

Further, since the plate thickness of the bottom of the inner container to which the bottom temperature detecting device is attached is made thinner than the other parts, the thermal response of the bottom temperature detecting device is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, 1 is an outer frame which constitutes the appearance of a rice cooker, 2 is an inner pot for putting food to be cooked therein, and 3 is an inner container for accommodating the inner pot 2. It is a pot-shaped container with no bottom, and the plate thickness of the bottom part to which the bottom temperature detecting device 5 is attached is thinner than the other parts. Reference numeral 4 is an induction heating coil attached below the inner container 3, and 5 is an inner pot 2.
In the bottom temperature detecting device for detecting the temperature of, the temperature detecting element (thermistor) 5a is fixed to the bottom rear surface of the inner container 3 by the fixing plate 5b. A control unit 6 controls a high frequency current to the induction heating coil 4 based on temperature information of the bottom temperature detecting device 5 and a lid temperature detecting device 8 described later. Reference numeral 7 is a lid that covers the upper opening of the inner pot 2. Reference numeral 8 denotes a lid temperature detector, which is provided on the heat dissipation plate 7a of the lid 7. During operation, the temperature information from the lid temperature detector 8 also affects the energization control performed by the controller 6. In the present embodiment, the plate thickness of the temperature detecting element 5a mounting portion of the inner container 3 is made thinner than the other portions, but this is for improving the thermal response.

As compared with the conventional structure, the bottom temperature detecting device 5 indirectly detects the temperature of the inner pot 2 via the inner container 3 and thus has poor thermal response. Therefore, the control unit 6 controls the high frequency current to the induction heating coil 4 based on the temperature information of the bottom temperature detection device 5 and the lid temperature detection device 8. Therefore, the temperature control during preheating is a cycle of constant energization, the amount of cooked rice is determined by the lid temperature detection device 8, and only the dry-up detection is determined based on the temperature information of the bottom temperature detection device 5, so that the conventional cooked rice control can be performed. .

[0014]

EFFECT OF THE INVENTION The rice cooker of the present invention has good cleanability because the bottom of the inner container has no opening or unevenness. Further, since the bottom temperature detecting device only fixes the temperature detecting element to the bottom rear surface of the inner container by the fixing plate, the structure of the bottom temperature detecting device is simplified.

[Brief description of drawings]

FIG. 1 is a schematic structural sectional view of a rice cooker showing an embodiment of the present invention.

FIG. 2 is a structural cross-sectional view of the bottom temperature detecting device of the same.

FIG. 3 is a schematic structural cross-sectional view of a rice cooker showing a conventional example.

FIG. 4 is a structural cross-sectional view of the bottom temperature detecting device of the same.

[Explanation of symbols]

 2 Inner pot 3 Inner container 4 Induction heating coil 5 Bottom temperature detection device 6 Control unit 7 Lid body 8 Lid temperature detection device

Claims (2)

[Claims] 1. An inner pot (2) for cooking, an inner container (3) for accommodating the inner pot (2), a lid (7) for covering an opening of the inner pot (2), and an inner container. (3) Based on the induction heating coil (4) attached below, the bottom temperature detecting device (5) for detecting the temperature of the inner pot (2), and the temperature information from the bottom temperature detecting device (5) A rice cooker provided with a control unit (6) for controlling a high frequency current to an induction heating coil (4), wherein the bottom surface of the inner container (3) has a flat shape without holes or irregularities, and the bottom outer surface. The bottom temperature detecting device (5) is attached to the section, the lid temperature detecting device (8) for detecting the temperature of the lid (7) is provided on the lid (7), and the control unit (6) further comprises: Bottom temperature detector (5)
A rice cooker characterized by controlling energization of an induction heating coil (4) based on temperature information of a lid temperature detecting device (8). 2. The rice cooker according to claim 1, wherein a plate thickness of a bottom portion of the inner container (3) to which the bottom temperature detecting device (5) is attached is made thinner than other portions.