JPH05245034A - Rice cooker - Google Patents

Abstract

PURPOSE:To prevent yellowing of rice due to overheat and tackiness of rice due to low temperature by covering an upper opening of a bowl housed in a protection frame of a rice cooker body with an outer lid, and providing a lid temperature sensor and lid heater on a radiation member on the upper surface of the bowl to control the tempratures during heat insulating operation. CONSTITUTION:A bowl 21 is detachably put into an internal protection frame 22 of a rice cooker body and a predetermined amount of water and rice is put into the bowl and an outer lid 25 having a radiation member 26 is put on the bowl. A bottom heater 23 and side heater 24 are energized to cook the rice. After the completion of the cooking, electrificating of the heaters 23, 24 is cut off and the temperature of the rice is controlled by a lid temperature sensor 29 provided on the member 26 and a lid heater 28 to accomplish a heat insulation mode. Part of the heater 28 is disposed so as to surround the periphery of a vapor exhaust port 27. As a result, yellowing and burning of rice due to overheat and tackiness of rice due to condensation caused by low temperature can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker mainly used at home.

[0002]

2. Description of the Related Art As a rice cooker having a heat retaining function, for example, one having the following structure is known.

That is, in FIG. 3, the pot 1 is detachably accommodated in the protective frame 2 and placed on the heater 3 below the protective frame 2 and heated. A side heater 4 is provided on the outer peripheral surface of the protective frame 2. An outer lid 5 that covers the upper opening of the pan 1 is provided so as to be openable and closable. A heat radiating member 6 is formed in the lower portion of the outer lid 5, and the outer lid 5 and the heat radiating member 6 are provided with penetrating steam holes 7 for discharging the steam in the pot to the outside.
A lid heater 8 is provided on the upper surface of the heat dissipation member 6. A bottom temperature sensor 9 is provided below the protective frame 2 in contact with the bottom of the pan 1.

In the above structure, when the temperature is kept warm, the bottom temperature sensor 9 detects the temperature of the pan 1 and outputs a signal to the control board to open and close the circuit of the side heater 4 and the lid heater 8 to open the bottom of the pan 1. Keep the temperature constant.

[0005]

In such a conventional rice cooker, the lid heater 8 is controlled by the bottom temperature sensor 9 that senses the temperature of the pot 1 when the temperature is kept warm, so that it is independent of the temperature of the heat radiating member 6. The circuit of the lid heater 8 is opened and closed. Therefore, the temperature range of the heat dissipation member 6 becomes large. When the temperature of the heat radiating member 6 is higher than the temperature of the rice in the pan 1, the temperature of the rice in the upper part of the pan rises and dries and turns yellow. On the contrary, when the temperature of the heat radiating member 6 is low, the steam in the pan 1 radiates the heat. There is a problem that dew drops on the bottom surface of the rice and the dew drops on the rice in the pan 1 and the rice becomes white and sticky.

Further, since the steam hole 7 of the heat radiating member 6 tends to communicate with the outside air of the rice cooker body to lower the temperature, the steam in the pan 1 will condense especially on the steam hole 7 of the heat radiating member 6. However, there was a problem that the dew dropped on the rice in the pot, and the rice locally turned white and became sticky.

The present invention is intended to solve the above problems, and a first object of the present invention is to provide a rice cooker that also serves as a heat retainer and has an excellent heat retaining performance that does not cause the rice in the pan to dry or become sticky.

A second object of the present invention is to provide a rice cooker that also serves as a heat retainer, by reducing the temperature unevenness of the heat dissipating member and further having an excellent heat retaining performance.

[0009]

In order to achieve the first object, the present invention is directed to a pot, a protective frame for removably accommodating the pot, and side heating provided on the outer periphery of the protective frame. Means, a bottom temperature sensor disposed below the protective frame, an outer lid that covers the upper opening of the pot, a heat dissipation member that constitutes the lower part of the outer lid, and a lid heating means that heats the heat dissipation member. When,
A lid temperature sensor disposed on the upper surface of the heat dissipation member,
A control circuit for controlling the heating output of the side surface heating means by the bottom temperature sensor and controlling the heating output of the lid heating means by the lid temperature sensor during heat retention.

In order to achieve the second object, a lid heater, which is a lid heating means, is arranged substantially all around the vapor discharge hole of the heat dissipation member.

[0011]

According to the present invention, since the lid heating means for heating the heat radiating member is controlled by the lid temperature sensor disposed on the same heat radiating member when the temperature is maintained, the temperature range of the heat radiating member becomes small and the pot top It is possible to prevent the rice from drying or yellowing, dew condensation on the lower surface of the heat dissipation member, whitening of the rice due to the dew drop, and stickiness.

Further, since the lid heater is arranged around the entire circumference of the steam discharge hole of the heat radiating member, the temperature unevenness is reduced, partial dew condensation on the lower surface of the heat radiating member, and the dew drop caused by the dew drop. It is possible to prevent whitening and stickiness.

[0013]

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

1 and 2, the pot 21 is a protective frame 22.
The heater 23 is detachably housed inside and is below the protective frame 22.
It is placed on and heated. A side heater 24 is provided on the outer peripheral surface of the protective frame 22. An outer lid 25 that covers the upper opening of the pan 21 is provided so as to be openable and closable. A heat radiating member 26 is formed in the lower portion of the outer lid 25, and the outer lid 25 and the heat radiating member 26 are provided with penetrating steam holes 27 for discharging the steam in the pot to the outside. A lid heater 28 is provided on the upper surface of the heat radiating member 26 around substantially the entire circumference of the steam hole 27 to prevent a local temperature drop in the steam hole 27 of the heat radiating member 26. Further, the lid temperature sensor 29 also includes the heat dissipation member 26.
Is disposed on the upper surface of. A bottom temperature sensor 30 is provided below the protective frame 22 in contact with the bottom of the pan 21.

In the above structure, when the temperature is kept warm, the bottom temperature sensor 30 detects the temperature of the pan 21 and outputs a signal to the control board to open and close the circuit of the side heater 24 to keep the bottom temperature of the pan 1 constant. The lid temperature sensor 29 detects the temperature of the heat radiating member 26 and outputs a signal to the control board to open and close the circuit of the lid heater 28 to keep the temperature of the heat radiating member 26 constant.

In this embodiment, the side heater 24 and the lid heater 28 are heated. However, needless to say, an induction heating coil may be used instead of the heater.

[0017]

As is apparent from the above embodiments, according to the present invention, since the lid heating means arranged on the heat radiating member is controlled by the lid sensor arranged on the same heat radiating member, the heating output is controlled. The temperature range of the heat dissipation member becomes smaller. Therefore, the temperature of the heat dissipation member is higher than the temperature of the rice in the pan, preventing the temperature of the rice in the upper part of the pan from drying and yellowing, and conversely, the temperature of the heat dissipation member is low and the steam in the pan is Condensation forms on the bottom surface of the heat dissipation member, and the dew drops on the rice in the pan,
Prevents the rice from turning white and sticky,
It is possible to provide a rice cooker that also serves as a heat insulator and has excellent heat insulating performance.

Further, according to the present invention, since the lid heater on the upper surface of the heat radiating member is arranged around the entire circumference of the steam hole that penetrates for discharging the steam in the pot to the outside, Eliminates unevenness between the temperature of the steam hole, which tends to decrease in communication with the temperature of other parts of the heat dissipation member, and causes partial condensation on the bottom surface of the heat dissipation member, and the whiteness of the rice locally due to the fall of the dew. It is possible to provide a rice cooker that also serves as a heat retainer and that has excellent heat retention performance by preventing the stickiness and stickiness.

[Brief description of drawings]

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

FIG. 2 is a plan view of a heat dissipation member provided with a lid heater and a lid sensor according to an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional rice cooker.

FIG. 4 is a plan view of a heat dissipation member provided with a lid heater of a conventional rice cooker.

[Explanation of symbols]

 21 Pan 22 Protective Frame 24 Side Heater 25 Outer Lid 26 Heat Dissipation Member 27 Steam Discharge Hole 28 Lid Heater 29 Lid Temperature Sensor 30 Bottom Temperature Sensor

Claims (2)

[Claims] 1. A pot, a protective frame for removably accommodating the pot, side heating means provided on the outer periphery of the protective frame, a bottom temperature sensor provided at the bottom of the pot, An outer lid that covers the upper opening of the pan, a heat dissipation member that forms the lower portion of the outer lid, a lid heating unit that heats the heat dissipation member, a lid temperature sensor that is disposed on the upper surface of the heat dissipation member, and at the time of heat retention. A rice cooker comprising: a control circuit for controlling the heating output of the side surface heating means by the bottom temperature sensor and for controlling the heating output of the lid heating means by the lid temperature sensor. 2. The rice cooker according to claim 1, wherein a lid heater as a lid heating means is provided on substantially the entire circumference of the steam discharge hole of the heating member.