JPH02274207A - Heating-cooking device - Google Patents

Abstract

PURPOSE:To prevent the abnormal operation of subject device by cooling a temperature fuse device fixed to a heater while providing a blower in the lower portion of the heater so that air taken from outside of the main body is forcibly discharged to the upper portion of the main body through the lower surface of the heater and the outside of a container. CONSTITUTION:A temperature fuse device 5 fixed to the lower surface of a heater 2 is cooled by air taken from the outside of a main body 1 by a blower 3 to maintain temperature sufficiently lower than the working temperature so that the temperature and output of the heater 2 are controlled by a controller 6 under the normal condition. Thus, said device 5 is prevented from its abnormal operation. However, in the abnormal case of locked blower 3 and failured controller 6, the temperature of the heater 2 is raised abruptly so that said device 5 senses quickly operatively the high temp. to restrain damages to the minimum. Further, the lower surface of the heater 2 is cooled by air taken from the outside of the main body 1 by the blower 3 so that the overheat of the heater 2 caused by thermal resistance between the heater 2 and a container 4 is prevented and the life of the heater 2 is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating cooker such as a rice cooker used in general households.

BACKGROUND OF THE INVENTION Conventional heating cookers such as rice cookers have a structure in which cooking is performed by placing a cooking container on a heater in a detachable manner, and even if the cooking container becomes dirty during cooking, it can be easily removed from the main body and cleaned. Furthermore, as shown in, for example, Japanese Unexamined Patent Publication No. 62-161313, there is also one in which a fan motor is provided at the bottom.

Problems to be Solved by the Invention In the conventional structure described above, the temperature rises quickly only on the lower surface of the container in contact with the heater, resulting in so-called heating unevenness in which the temperature is relatively low in the middle and upper portions of the container.

Furthermore, since there is a certain thermal resistance between the heater and the container, there is a problem in that the larger the output of the heater, the greater the amount of heat loss, resulting in overheating of the heater and shortening the life of the heater. Furthermore, in a so-called abnormal heating state where the control device has failed, a temperature fuse device that can quickly detect abnormal temperature rises in the heater is required as the only safety device, but in principle, the best method is to fix the temperature fuse device to the heater. Good responsiveness can be predicted from the principle of thermal conductivity, but this cannot be achieved with products whose heater temperature is higher than the operating temperature of the temperature fuse device, and with products where the container can be attached to and detached from the heater even when the heater temperature is low. In this case, if the thermal resistance between the heater and the container increases, or if the output of the heater increases, the amount of heat loss will also increase, causing the heater to overheat.
Because temperature fuse devices tend to malfunction and lack reliability, it has been necessary to install temperature fuse devices in areas where the operating speed is slow.

Means for Solving the Problems The present invention has been made to solve the above-mentioned drawbacks.A temperature fuse device is fixed to the heater, and an air blower is provided at the bottom of the heater to direct air taken in from outside the heater to the bottom surface of the heater. The liquid is forcibly discharged from the top of the main body through the outside of the container.

Effect With the above configuration, the air from the blower cools the lower surface of the heater and also cools the temperature fuse device, and the heated air heats the side of the container as it passes between the outer wall of the container and the inner wall of the main body. In addition to eliminating uneven heating, malfunctions of the temperature fuse device are also eliminated.

Example An embodiment of the present invention will be described below with reference to FIG.

1 is the main body, 2 is a heater 3 provided at the inner bottom of the main body 1, a blower is provided at the bottom of the main body 1 at the bottom of the heater 2, 4 is a container removably placed on the heater 2, and 5 is a heater. 2 is a temperature fuse device fixed to the lower surface of the heater 2, 6 is a control device that controls the heater 2, etc. provided at the bottom of the heater 2, and 7 is a lid body that closes the opening of the container 4. The effect of the example will be explained.

The food to be cooked is placed in the container 4, the opening of the container 4 is closed with the lid 7, and the heater 2. When blower 3 is operated, heater 2
generates heat, and the heat is conducted from the upper surface of the heater 2 to the lower surface of the container 4. On the other hand, the lower surface of the heater 2 is cooled by the air taken in from the outside of the main body 1 by the blower 3, and as a result, the direction of the taken air becomes warm air as it passes between the outer wall of the container 4 and the wall 41 of the main body 1. The hot air heats the sides of the container 4 and is forcibly discharged from around the upper part of the main body 1. Therefore, the container 4 is heated from the bottom side and the side surface of the container 4 is added, and the container 4 is heated evenly on the top and bottom of the container 4, and cooking is performed without uneven heating.

Also, a temperature fuse device 5 fixed to the bottom surface of the heater 2
is cooled by air taken in from the outside of the main body 1 by the blower 3 and kept at a temperature sufficiently lower than its operating temperature,
Under normal conditions, the temperature and output of the heater 2 are controlled by the control device 6, so the temperature fuse device 5 will not malfunction. However, in abnormal conditions such as when the blower 3 is locked or the control device 6 is broken, the temperature of the heater 2 will rise rapidly, and the temperature fuse device 5 fixed to the bottom of the heater 2 will also be damaged due to its structural characteristics. It senses heat and operates quickly, minimizing damage. Furthermore, the lower surface of the heater 2 is cooled by the air taken in from outside the main body 1 by the blower 3, preventing the heater 2 from overheating due to the thermal resistance between the heater 2 and the container 4, and thereby preventing the lifespan of the heater 2 from being shortened. .

Next, another example will be explained using FIG. 2.

1 is the main body, 2 is a heater provided at the inner bottom of the main body 1, 3
is the blower installed at the bottom of the main body 1 at the bottom of the heater 2,
4 is a container detachably placed on the heater 2; 5 is a temperature fuse device fixed to the lower surface of the heater 2; and 6 is a control device for controlling the heater 2 and the like. 7 is a lid body that closes the upper opening of the main body. This lid body 7 has a ventilation chamber 10 formed by combining and fixing an inner lid 8 and an outer lid 9. A ventilation hole 8a is provided on the outer periphery of the inner lid 8, and a ventilation hole 8a is provided through the outer lid 9 near the center. The outer lid 9 has a steam exhaust port 8b, and the outer lid 9 has an exhaust port 9a around the steam exhaust port 8b, and the inner lid 8 is in close contact with the upper end of the container 4 near its outer periphery.

The operation of the embodiment having such a configuration will be explained.

When food is placed in the container 4 and the opening of the main body 1 is closed with the lid 7, the heater 2 and the blower 3 are operated.
At the same time, heat is conducted from the top surface to the bottom surface of the container 4, and at the same time, the bottom surface of the heater 2 is cooled by the air taken in from outside the main body 1 by the blower 3, and as a result, the taken air becomes warm air and blows against the outside wall of the container 4. When passing between the inner wall of the main body 1 and the inner wall of the main body 1, it heats the side surface of the container 4, passes through the ventilation port 8a, passes through the ventilation chamber IO, and is forcibly discharged from the exhaust port 9a while heating the inner lid 8. Cooking is done with even temperature at the top and bottom. Note that the steam generated when the temperature of the food to be cooked reaches a boiling state is discharged from the steam outlet 8b.

Effects of the Invention According to the present invention, a blower is provided at the bottom of the main body, and air taken in from outside the main body is used to cool the temperature fuse device fixed to the bottom surface of the heater, thereby eliminating malfunctions. The temperature of the control device also does not rise due to the heat of the heater (there is no need for heat shielding devices that were previously required, which is highly effective in terms of cost and space.

It prevents the heater from overheating based on thermal resistance and does not shorten the life of the heater. Also, the blower may lock or
Even if there is an abnormal condition such as a failure of the control device, the temperature fuse device fixed to the bottom of the heater allows it to quickly sense heat and operate.

There is no need for a safety device, and the heat energy from the bottom of the heater, which would otherwise have been wasted, converts the air taken in by the blower into warm air, which heats the sides of the container, allowing for even cooking.

Furthermore, by providing an exhaust port around the steam exhaust port of the outer lid, the user does not feel uncomfortable and the exhaust ports are all in one place, ensuring the same ease of use as a conventional cooker.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view of an embodiment of the present invention, and FIG. 2 is a side cross-sectional view of a sentencing embodiment. 1...Main body, 2...Heater 3...
・Blower, 4... Container, 5... Temperature fuse device, 6... Control device, 8b... Steam outlet,
9a...Exhaust port. 10... Ventilation room.

Claims (3)

[Claims] (1) The container (4) is removably placed on the heater (2) provided at the inner bottom of the main body (1), and has a control device (6) for controlling the heater (2); Container (4)
In a heating cooker having a lid body (7) that closes the opening of the heater (2), air taken in from outside the main body (1) is drawn in from outside the main body (1) by a blower (3) provided at the bottom of the main body (1).
), passing between the outer wall of the container (4) and the inner wall of the main body (1), and forcibly discharging from the upper part of the main body (1). (2) The cooking device according to claim 1, characterized in that the thermal fuse device (5) is fixed to a part of the heater (2). (3) The blower (3) installed at the bottom of the main body (1) draws air from outside the main body (1) into the heater (
2), a vent hole (8a) that passes between the outer wall of the container (4) and the inner wall of the main body (1), and is further provided in the inner lid (8).
2. The heating cooking device according to claim 1, wherein the steam is forcibly discharged from the vicinity of a steam outlet (8b) provided in the lid (7) after passing through the ventilation chamber (10).