JPH08164064A - Gas rice cooker - Google Patents

Abstract

PURPOSE: To provide a gas rice cooker capable of reducing cooking time for small rice quantity and uniformly cooking and with good operability. CONSTITUTION: For small rice quantity, a flame control part 4 to control burning gas quantity of a burner 12 is constructed, a switching solenoid valve 5 to shut a by-pass line 6 detouring the flame control part 4 and a thermistor 7 abutting to the bottom of a rice cooker 8 to detect cooking temperature are connected to a controller 9 to control igniting and extinguishing, and the switching solenoid valve 5 is opened to burn with maximum flame during a period from the ignition to the time that the thermistor 7 detects the boiling temperature. After detecting the boiling temperature, the switching solenoid valve is opened to burn with flame controlled by the flame control part 4 to reduce the cooking time preventing uneven cooking in small rice quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas rice cooker, and more particularly to a gas rice cooker having a heat power adjusting function for reducing the amount of combustion according to the amount of rice cooked.

[0002]

2. Description of the Related Art Conventionally, a gas rice cooker is known in which the heating power can be adjusted according to the amount of rice cooked. For example, the gas rice cooker shown in FIG. 4 is provided with a source solenoid valve 1 and a main solenoid valve 2 for opening and closing the fuel gas passage, and a gas governor 3 for providing a constant supply pressure of the fuel gas is provided downstream thereof. A thermal power adjustment unit 4 that adjusts the thermal power by changing the opening of the gas flow path is provided downstream. Alternatively, there is also one in which the thermal power control unit is made by making the supply pressure by the gas governor 3 variable. A burner 12 that burns a mixture of fuel gas and air is provided at the most downstream side of the flow path, and a rice cooker 8 is provided above the burner 12. Further, the electrode 10 that discharges and ignites the air-fuel mixture of the burner 12, the frame rod 11 that monitors the presence or absence of flame misfire, and the thermistor 7 that abuts on the bottom of the rice cooker 8 to detect the completion temperature of cooked rice. It is connected to a controller 9 which controls the control together with the above actuators and performs predetermined ignition / extinction control.

When the amount of cooked rice is smaller than the amount of cooked rice,
By manually operating the heating power adjustment unit to prevent uneven cooking, the heating power is adjusted according to the amount of rice cooked. For example,
When cooking 0.4 liters of rice with a 2 liter gas rice cooker, adjust the heat adjustment scale of the heat adjustment part 4 to the weak heat position and adjust the adjustment power of the heat adjustment part 4 to 1800 kca.
Start cooking after reducing the high heat power of 1 / h to the low heat power of about 980 kcal / h in advance. In this way, by adjusting the heat power according to the amount of cooked rice, it is possible to prevent spilling and uneven cooking, and cook rice with a good taste.

[0004]

However, in such a gas rice cooker, there is a problem that the rice cooking time is not shortened even though the amount of rice cooked is small. In other words, since the heating power is reduced according to the amount of cooked rice, it takes almost the same cooking time even if the amount of cooked rice is large or small, resulting in poor usability when the amount of cooked rice is small.
An object of the gas rice cooker of the present invention is to solve the above problems and to provide a convenient gas rice cooker that shortens the rice cooking time without impairing the quality of rice cooked when the amount of rice cooked is small.

[0005]

A gas rice cooker of the present invention which solves the above-mentioned problems is a burner for burning a fuel gas, a rice cooker heated by combustion heat from the burner, and a rice cooker according to the amount of cooked rice. When the heating power adjusting means for adjusting the amount of combustion to the burner, the temperature detecting means for contacting the bottom of the rice cooker to detect the rice cooking temperature, and the rice cooking temperature by the temperature detecting means reaches the rice cooking completion temperature. Is a gas rice cooker having a combustion stopping means for closing combustion by closing a gas flow path to the burner, and in the early stage of combustion until the temperature detected by the temperature detecting means reaches a boiling temperature, the heat power adjusting means is provided. The gist of the present invention is to provide a strong heating power heating means for heating the rice cooker with the maximum heating power regardless of the adjusted heating power.

Further, the gas rice cooker of the second invention is the gas rice cooker of the first invention, in which a bypass passage bypassing the heat power adjusting section in the heat power adjusting means is provided to switch from the maximum heat power to the adjustment heat power. The gist is to provide a bypass passage opening / closing means for closing the bypass passage.

[0007]

The gas rice cooker according to the first aspect of the present invention having the above structure is
In the early stage of combustion until the rice cooking temperature reaches the boiling temperature by the temperature detection means, the rice cooker is heated by the maximum heat power by the high heat power heating means regardless of the adjusted heat power, and after the boiling temperature is reached, the rice cooked by the heat power adjusted by the heat power adjustment means. Heat the kettle. In other words, when the amount of cooked rice is small, heating is not performed uniformly with the adjusted heating power from ignition to completion of cooking, but is performed with the maximum heating power until boiling. That is, the boiling time and cooking unevenness are affected by the heat power after boiling and not affected by the heat power until boiling, and the rice cooking time is shortened by heating at the maximum heat until boiling. Therefore, when the amount of cooked rice is small, the cooking time can be shortened without impairing the quality of the cooked rice, which is convenient.
The maximum firepower is not necessarily limited to the maximum firepower, but refers to firepower equivalent to the maximum firepower.

The gas rice cooker of the second invention is the gas rice cooker of the first invention, in which the bypass passage opening / closing means closes the bypass flow passage bypassing the thermal power control section.
Switch from the maximum thermal power to the preset thermal power. That is, from ignition to boiling, in addition to the flow path provided with the thermal power control unit, the bypass flow path bypassing the thermal power control unit is opened to burn at maximum thermal power. After reaching the boiling temperature, the bypass flow passage is closed, and only the flow passage provided with the thermal power control unit is opened to burn with the controlled thermal power. Therefore,
With an inexpensive and simple structure, it is possible to achieve high-power combustion at the initial stage of ignition, and when the amount of cooked rice is small, the cooking time can be shortened without impairing the quality of the cooked rice.

[0009]

EXAMPLES In order to further clarify the constitution and operation of the present invention described above, preferred examples of the gas rice cooker of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a gas rice cooker as one embodiment, which includes a source solenoid valve 1 for opening and closing a fuel gas supply path, a main solenoid valve 2, and a fuel gas located downstream of these solenoid valves 1 and 2. A gas governor 3 is provided to keep the supply pressure of the gas constant. Downstream of the gas governor 3, there is provided a heating power adjusting unit 4 for changing the opening of the gas flow path to set the adjusting heating power, and the ignition heating power according to the amount of cooked rice is set in advance by manual scale adjustment before ignition. . A burner 12 that burns a mixture of fuel gas and air is provided downstream of the thermal power control unit 4, and a rice cooker 8 that stores rice and water is placed above the burner 12.

Further, a bypass flow path 6 that bypasses the thermal power control section 4 is provided, and a switching solenoid valve 5 that opens and closes the flow path is provided in the bypass flow path 6. The bypass flow path 6 is opened only from the initial stage of ignition to boiling, and plays a role of burning with strong heat until it blows up regardless of the adjusted heat of the heat adjuster 4.

Further, the electrode 10 for discharging and igniting the air-fuel mixture from the burner 12, the frame rod 11 for monitoring the combustion state of the ignited flame, and the center of the bottom of the rice cooker 8 are contacted to detect the rice cooking temperature. A thermistor 7 is provided, and is connected to the controller 9 that controls the drive control together with the source solenoid valve 1, the main solenoid valve 2 and the switching solenoid valve 5 described above. The controller 9 monitors whether the temperature detected by the thermistor 7 is equal to or higher than a predetermined temperature, and controls the predetermined ignition / extinction.

Next, this embodiment will be described with reference to the flowchart showing the processing of the controller 9 shown in FIG. First, the rice is washed 30 minutes or more before cooking rice, soaked in water and hydrated, and then the rice and water are put in the rice cooker 8 and placed on the burner 12. Then, in step 1, when the amount of cooked rice is small, the thermal power adjuster 4 is adjusted according to the amount of cooked rice to set the thermal power so that the heating power becomes weak. In step 2, when the ignition operating unit (not shown) is operated, the controller 9
The switching solenoid valve 5 provided in the original solenoid valve 1, the main solenoid valve 2 and the bypass passage 6 is opened, and the fuel gas is supplied to the burner 12 via the gas governor 3. At the same time, the controller 9 activates the igniter to discharge the electrode 10 and start the ignition operation. Then, combustion is started in the burner 12, and rice is cooked under the flame monitoring by the frame rod 11. At the initial stage of ignition, the bypass flow path 6 that bypasses the thermal power control unit 4 is opened, so that the combustion is performed with high thermal power. The heat is absorbed by the rice cooker 8 itself at the beginning of heating, and when the rice cooker 8 is heated to some extent, the heat is absorbed by the cooked rice in the rice cooker 8 and the cooked rice temperature rises.

In the following step 3, the controller 9 monitors whether the temperature detected by the thermistor 7 in contact with the bottom of the pot reaches 98 ° C. When the detected temperature reaches 98 ° C., the process proceeds to step 4, and the controller 9 determines that the boiling state is reached and closes the switching electromagnetic valve 5 and closes the bypass passage 6. That is, the gas flow path to the burner 12 is only the flow path that passes through the thermal power control unit 4, and the combustion is continued by changing the strong thermal power to the weak thermal power that is adjusted in advance before ignition. When the cooking temperature reaches the boiling point, the cooking temperature does not change for a while, and the cooked rice temperature keeps an equilibrium state until the water in the pot is completely evaporated. Next, in step 5, the temperature detected by the thermistor 7 is 120 ° C.
The controller 9 monitors whether or not And
When the rice cooking is nearing completion, the water content decreases and the rice cooking temperature begins to rise rapidly. The temperature detected by the thermistor 9 is 120 ℃
When it reaches, in step 6, the controller 9 closes the original solenoid valve 1 and the main solenoid valve 2 to shut off the gas flow path to extinguish the fire. Then, the rice cooking is completed after 10 to 15 minutes of the spotting time.

In general, the spilled or cooked unevenness is affected by the heat power after boiling and is not affected by the heat power until boiling. Therefore, in the present embodiment, combustion is performed with high heat until boiling, and after boiling, combustion is performed according to the amount of cooked rice. That is, from ignition to boiling, in addition to the flow path in which the thermal power control unit 4 is provided, the bypass flow path 6 that bypasses the thermal power control unit 4 is opened and burns at maximum thermal power. After reaching the boiling temperature, the bypass flow passage 6 is closed, and only the flow passage provided with the thermal power control unit 4 is opened to burn with the controlled thermal power. Therefore, instead of burning with uniform heating power set according to the amount of rice cooked from ignition to extinction as in the conventional example, it burns with strong heat power from ignition to boiling regardless of heating power adjustment, so rice cooking time is shortened. it can.

For example, in the case of a 2-liter gas rice cooker, the high heat power is 1800 kcal / h, and when the amount of cooked rice is 0.4 liter, it is 980 k to prevent uneven cooking.
The heat power must be adjusted to the low heat power near cal / h. In the conventional case, since it burns with a uniform low heating power,
As shown in b), it took 9 minutes and 28 seconds to blow up,
It takes 16 minutes and 52 seconds to cook and extinguish the fire. On the other hand, in the present embodiment, as shown in FIG. 3A, since it burns with high heat at the initial stage of ignition, it blows up in 4 minutes 32 seconds and cooks up in 11 minutes 50 seconds to extinguish the fire. Therefore, the time from ignition to extinguishing can be reduced by about 5 minutes.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the spirit of the present invention. Is. For example, the thermal power control unit 4 that regulates thermal power and the switching solenoid valve 5 that is provided in the bypass bypass flow path 6 are replaced with a flow rate control valve that controls the flow rate, and the gas flow rate is maximized until it blows up. After the temperature rises, the flow rate may be controlled to reduce the gas flow rate. Further, the switching solenoid valve 5 provided in the bypass flow path 6 may be replaced with a magnet safety valve that is manually opened, and may be connected to a thermistor that increases electric resistance when the detected temperature is equal to or higher than the boiling temperature. The magnetic safety valve may lose the valve opening retention force and close the bypass flow path 6 when the pressure reaches the point.

Further, the detection temperatures for blowing and cooking are not limited to 98 ° C. and 120 ° C., respectively.
It is free to change the detected temperature in consideration of responsiveness or the detection position of the thermistor 7. Also, the thermistor 7
The position of is not limited to the bottom of the pot, and may be a temperature sensor provided at another position as long as it can detect the rice cooking temperature in the pot. Further, the heat power adjusting unit 4 that adjusts the heat power according to the amount of cooked rice is not limited to the one set by manual operation, and the amount of cooked rice is estimated from the temperature of cooked rice detected immediately after ignition, so that the amount of cooked rice can be adjusted according to the amount of cooked rice. The amount of combustion may be automatically reduced. The thermistor 7 that detects the rice cooking temperature may be a temperature sensor that closes the gas flow path by generating a predetermined stroke when the temperature reaches a predetermined temperature. For example, a material that adsorbs and desorbs, a material that expands, or a material that deforms depending on temperature, that is, a material that uses a magnet, a thermoelement, a bimetal, or a shape memory alloy may be used. Further, in the controller 9, the monitoring unit and the control unit for determining and processing the information from the thermistor 7 may be configured by a microcomputer as a main unit or may be configured by a discrete circuit.

[0018]

As described above in detail, according to the gas cooker of the first invention, the rice cooking time can be shortened when the amount of rice cooked is small, which is convenient. In addition, the gas rice cooker of the second aspect of the present invention can perform temporary maximum thermal power combustion at the initial stage of ignition with an inexpensive and simple structure, and has an excellent effect that the rice cooking time can be shortened when the rice cooking amount is small. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas rice cooker according to an embodiment of the present invention.

FIG. 2 is a flowchart according to an embodiment of the present invention.

FIG. 3 is a graph showing a comparison between an example of the present invention and a conventional example regarding the relationship between cooking rice temperature and time.

FIG. 4 is a schematic configuration diagram of a gas rice cooker according to a conventional example.

[Explanation of symbols]

 1 original solenoid valve 2 main solenoid valve 3 gas governor 4 thermal power control unit 5 switching solenoid valve 6 bypass flow path 7 thermistor 8 rice cooker 9 controller

Claims (2)

[Claims] 1. A burner for burning fuel gas, a rice cooker heated by combustion heat from the burner, a heating power adjusting means for adjusting the amount of combustion to the burner according to the amount of cooked rice, and the rice cooker of the rice cooker. A temperature detecting means for contacting the bottom of the pot to detect the rice cooking temperature, and when the rice cooking temperature by the temperature detecting means reaches the rice cooking completion temperature, the gas passage to the burner is closed to stop the combustion. In a gas rice cooker equipped with means, in the early stage of combustion until the temperature detected by the temperature detecting means reaches the boiling temperature, a high heat power that heats the rice cooker with the maximum heat power regardless of the heat power adjusted by the heat power adjustment means. A gas rice cooker having a heating means. 2. A bypass passage for bypassing the thermal power control portion of the thermal power control means is provided, and a bypass passage opening / closing means for switching from the maximum thermal power to the regulated thermal power by closing the bypass path is provided. The gas rice cooker according to claim 1.