JPS6332649Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas rice cooker with a heat insulator.
In a rice cooking pot that heats and keeps the inside of the rice cooker warm by a heat insulating heater that forms an outer gap and is placed inside the heat insulating material through the inner gap, a thermal switch that controls the cooking rice temperature in the rice cooker is installed on the outside of the heat insulating material. It is located in a position that is directly affected by changes in room temperature, and by setting it in a position that minimizes the temperature difference due to the room temperature of the rice cooker, the temperature inside the rice cooker is not affected by changes in room temperature in summer and winter, and the temperature inside the rice cooker is always approximately 100%. The purpose is to maintain constant temperature.

As shown in Fig. 2, a conventional gas rice cooker with heat retention of this type has a heat retention heater 10' disposed on the inner surface of the heat insulation material 1', and a thermal switch S' that controls the heat retention temperature for cooking rice. It has a structure in which it is buried near the heat insulating heater 10' inside the heat insulating material 1'.

Therefore, it is not affected by changes in room temperature, so the control temperature of the rice cooker is higher or lower than the predetermined heat retention temperature in summer and winter, and there is a temperature difference between summer and winter, and it is always approximately constant. The drawback was that it could not keep the rice at the cooking temperature.

This idea rectified these conventional shortcomings by correcting the activation timing of the thermal switch to account for the effects of the difference in room temperature between summer and winter, so that the temperature inside the rice cooker was always maintained at a constant temperature. It is something.

One embodiment will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a heat insulating material, which is provided between the outer shell 4 and the rice cooking pot 7, and is located between the heat insulating material 1 and the outer shell 4 on the outside, which is the air supply passage for the gas burner 11 for cooking rice. While forming the gap 3, the heat insulating material 1
An inner gap 2, which is an exhaust passage for a gas burner 11 for cooking rice, is formed between the rice cooker 7 and the gas burner 11 for cooking rice. A gap 8 between the gas burner 11 and the insertion hole 12 into which the gas burner 11 is inserted communicates with each other. Reference numeral 5 denotes an opening of the outer gap 3, which is bored in the upper peripheral edge of the outer shell 4 of the container body, and serves as an air supply port during gas cooking. Reference numeral 6 denotes an opening in the inner gap 2, which is bored directly above the air supply port 5 between the upper edge of the outer shell 4 and the lower edge of the lid 9 or in the lid 9, and is an exhaust port during gas cooking. It is. Thus, the balance between air supply and exhaust during gas cooking is maintained through the openings 5 and 6 which are disposed close to each other in the upper and lower directions, so that air supply and exhaust can be carried out smoothly. Reference numeral 10 denotes a heat-retaining heater, which is installed inside the heat-insulating material 1 and located slightly below the center of the rice cooking pot 7. After rice cooking is completed, the heat-retaining heater 10 is energized to heat the rice through the air layer interposed in the inner gap 2. It is designed to heat up. S is a thermal switch for automatically controlling the temperature inside the pot to a preset heat retention temperature.
The thermal switch S is installed in a position that is directly affected by temperature changes in summer and winter on the outside of the rice cooker 7, and in a position where the temperature difference in the rice cooker pot 7 caused by changes in room temperature is as small as possible. By turning on and off the heat-retaining heater 10, the temperature inside the rice cooking pot 7, that is, the heat-retaining temperature for cooking rice, can be maintained at a required substantially constant temperature. In addition, 13
is the stove part of a gas rice cooker.

Since this device has the above-mentioned structure, when the temperature inside the rice cooker pot 7 is lower than the predetermined heat retention temperature and the heat retention operation is performed, the thermal switch S is turned on and the heat retention heater 10 is energized to start heating. As the heater 10 heats, the rice cooker 7 is heated through the air layer present in the inner gap 2, and at the same time, the heat from the heater 10 is transmitted through the insulation material 1 and acts on the thermal switch S to raise the temperature. . Since the air flowing from the air supply port 5 into the outer gap 3, which is the air supply passage, acts on the thermal switch S, the temperature gradually rises while the rate of temperature rise is adjusted, and when it reaches the operating temperature, the thermal switch S is turned off, power supply to the heat-retaining heater 10 is cut off, and heating is stopped.

The time required to stop this heating differs depending on the room temperature in summer and winter, that is, the temperature of the air flowing into the outer gap 3. In summer, the rate of increase is faster than in winter, and the thermal switch S is turned off, and the temperature is increased accordingly. The energization is cut off quickly, and the temperature of the heater section around the heat-retaining heater 10 is controlled to be lower in summer than in winter.

Therefore, even if the state of heat dissipation from the rice cooker pot 7 differs due to room temperature changes in summer and winter, and the temperature difference between the heater section temperature and the internal temperature of the rice cooker pot 7 changes in response to room temperature changes, the temperature In proportion to the change in the difference, the temperature of the heater part is controlled to be higher in winter than in summer, so even though the operating temperature of thermal switch S is constant, the energization time to the heat retention heater is changed and the temperature of the heater part is increased. As a result, the temperature inside the rice cooker pot 7 can be maintained at a predetermined heat retention temperature.

As explained above, this invention is based on the following insulation materials:
Outside, it serves as an intake and exhaust passage for the gas burner used for cooking rice.
In a gas rice cooker with an outer gap, the thermal switch that controls the temperature inside the rice cooker is located outside the insulation layer in a position directly affected by changes in room temperature, and the heater temperature is changed in proportion to the change in the temperature difference between the heater temperature and the temperature inside the rice cooker due to room temperature changes in summer and winter, so the temperature inside the cooker is hardly affected by room temperature differences in summer, winter, etc., and the warming temperature for cooking rice is always controlled to a substantially constant required temperature. Furthermore, since the openings of the inner and outer gaps are located close to each other during gas cooking, the intake and exhaust of the gas burner for cooking rice is balanced and the intake and exhaust are performed smoothly, and the exhaust heat after cooking is completed is bypassed and reversed in a long series of inner and outer gaps, so there is little heat dissipation due to drafts, and heat loss is very small, making gas cooking efficient and energy-saving, and effective warming with little temperature error.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of this invention, and FIG. 2 is a sectional view of a main part of a conventional example. 1... Heat insulating material, 2... Inner gap, 3... Outer gap, 4... Outer shell of the container body, 5, 6... Opening, 7... Rice pot, 8... Communication gap, 9... Lid body, 10... Heater, 11... Gas burner, S... Thermal switch.

Claims (1)

[Scope of utility model registration request] A series of inner gaps 2 and outer gaps 3 are formed in the inside and outside of the heat insulating material 1 in detour communication at the lower part, and the inner gaps 2 and the outer gaps 3 are provided close to the upper peripheral edge of the container outer shell 4. In a gas rice cooker of the type in which air is supplied to a gas burner 11 for rice cooking by communicating with openings 6 and 5, and combustion exhaust gas is discharged from an inner gap 2, a heat insulating heater 10 is disposed inside the heat insulating material 1. A thermal switch S for controlling the heating temperature of cooking rice in the rice cooking pot 7 is connected to the heat insulation material 1 in the outer gap 3.
Gas rice cooking with heat retention, characterized in that it is located at a position that is directly affected by changes in room temperature on the outer side of the rice cooker, and is located at a position that minimizes the temperature difference in the rice cooking pot 7 caused by the heat retention heater 10 caused by changes in room temperature. vessel.