JPS61272013A - Heat insulating type rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat-retaining rice cooker for use in general households.

2. Description of the Related Art Conventional heat-retaining rice cookers of this type have been constructed using a thermostat as disclosed, for example, in Japanese Patent Publication No. 5i-13863. That is, the fourth
At point 8 of the temperature curve in the figure, turn on the manual switch of the heat-retaining rice cooker and energize the rice cooker to start cooking.
As soon as the predetermined temperature T is reached, the non-automatic return type thermal response device is activated to cut off the rice cooking heater circuit and the rice cooking is completed. After that, the preheating of the heater continues to be uneven, and at point C when the temperature has fallen to t2, the thermostat operates and energizes the heater, and when the temperature rises to tl, it stops energizing the heater. By being returned, t
The heater was kept warm in the temperature range from 1 to t2, and if the temperature dropped further than t2 due to a power outage, etc., the thermostat would not turn on power to the heater after that.

Problems to be Solved by the Invention However, in such a configuration, the lower limit of the heat retention setting temperature and the reference temperature (a temperature below which no heat retention is performed after this temperature) are the same temperature t2. If the temperature temporarily drops below t2 by opening the outer lid of the thermal rice cooker to serve rice, or when moving the thermal rice cooker from the kitchen to the dining table for eating, When the power plug is pulled out, if the temperature drops below t2, the heat is no longer kept warm, which is extremely inconvenient.

In addition, it is extremely difficult for a thermostat to directly detect the temperature of the pot, and since this thermostat is affected by outside air and the heater, the temperature accuracy is very poor, and the noise generated when the contacts open and close is very high. , there was a problem that it had a negative effect on wireless devices used in ordinary homes, so it was legally prohibited to use it in ordinary households.

The present invention solves these problems, and even if the temperature of the pot drops temporarily by opening the outer lid or unplugging the power plug while keeping it warm, it is possible to continue keeping it warm as usual. The purpose is to provide a heat-retaining rice cooker.

Means to solve problems In order to solve the above problems, the present invention provides a method for cooking rice.

an operating means for operating the start of keeping warm; a keeping heater for heating the pot; a temperature detecting means for detecting the temperature of the pot; and a pot temperature detected by the temperature detecting means to keep the pot temperature at a keep warm setting temperature. The apparatus is provided with a heat retention control means that controls the heater and, on the other hand, controls the heat retention heater not to be energized when the pot temperature is lower than the reference temperature.

Effects According to the above configuration, the warming operation is controlled by comparing the temperature of the pot with the reference temperature, so even if the user mistakenly starts the warming operation after putting rice and water in the pot, The heating heater is not energized, so the rice and water are not heated to the temperature set to keep them warm and then boiled. As a result, even if the user realizes the mistake and starts cooking, the rice remains delicious. I can cook rice. Furthermore, even if the temperature of the pot drops temporarily by opening the outer lid or unplugging the power plug while keeping it warm, keeping it warm can continue as long as the temperature is above the reference temperature.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 3, 1 is a cylindrical outer frame, and 2 is an inner frame provided within the outer frame 1. The inner frame 2 is formed by drawing a thin metal plate into a cylindrical shape. Reference numeral 3 denotes a rice cooking heater installed at the inner bottom of the inner frame 2, and a pot 4 is removably placed on the rice cooking heater 3. 6 is an outer lid with a heat-insulating structure; 6 is an inner lid that covers the upper opening of the pot 4; 7 is a heat-retaining heater wrapped around the outer surface of the inner frame 2;
Reference numeral 8 denotes a temperature detection device fixed to the inner frame 2 by an elastic body 9, and this temperature detection device 8 is pressed against the outer surface of the pot 4 by the springiness of the elastic body 9. 1o is cooking rice.

11 is a heat retention lamp that lights up during the heat retention operation; 12 is a heat retention control means; this heat retention control means 12 compares the temperature detected by the temperature detection device 8 with a reference temperature, and controls the heat retention heater. 7 and the operation of the heat-retaining lamp 11. 13 is a non-automatic return type thermal response device that is interlocked with the operating means 1o, and 14 is a power plug.

Next, the operation of the above embodiment will be explained based on the flowchart of FIG. 1 and the temperature curve of FIG. 2.

First, put the specified amount of rice and water into pot 4. and operating means 10
When rice cooking starts, the rice cooking heater 3 is energized,
As soon as the predetermined temperature T is reached, the non-automatic return type thermal response device 13 is activated to stop energizing the rice cooking heater 3, and at the same time automatically starts keeping the rice warm. When this warming is started, the temperature of the pot 4 is detected by the temperature detection means 8.

Then, the temperature is compared with the reference temperature by the heat retention control means 121C.

Here, the reference temperature is set to be a little higher than the maximum room temperature and lower than the heat retention setting temperature.

Therefore, when the temperature of the pot 4 is higher than the reference temperature, the heat retention lamp 11 is turned on and the energization of the heat retention heater 7 is controlled to maintain the temperature of the pot 4 at the heat retention set temperature.

When the outer lid 5 is opened to serve the rice that is being kept warm at point C in FIG. Even if the temperature drops as indicated by the lower temperature curve, as long as the temperature is above the reference temperature, normal warming can be performed by plugging in the power plug 14 again.

Even if the user mistakenly starts warming using the operating means 10 after putting rice and water into the pot 4 with the intention of cooking rice, the temperature of the pot 4 containing water will still be lower than the reference temperature. For,
The heat retention control means 12 does not perform the heat retention operation. Therefore, the temperature of the pot 4 is maintained at room temperature as shown by the temperature curve C in FIG. 2, and delicious rice can be cooked even if the user starts the rice cooking operation after noticing the mistake.

Effects of the Invention As described above, according to the present invention, a reference temperature is set between the maximum room temperature and the heat retention setting temperature, and the heat retention operation is controlled by comparing the pot temperature with this reference temperature. , even if you accidentally start keeping warm after putting rice and water in the pot, the heater will not be energized, and as a result, the temperature of the rice and water in the pot will remain at room temperature without rising. . This results in
Even if the user starts cooking after noticing the mistake, delicious rice can still be cooked. In addition, even if the temperature of the pot drops temporarily by opening the outer lid or unplugging the power plug while keeping it warm, it can continue to keep warm as usual, making it extremely easy to use. It is something to play.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operating sequence of the heat retention type rice cooker in an embodiment of the present invention, FIG. 2 is a temperature curve diagram of the heat retention type rice cooker, FIG. 3 is a sectional view of the heat retention type rice cooker, and FIG. Figure 4 is a temperature curve diagram of a heat-retaining rice cooker using a conventional thermostand. 4... Pot, 7... Heater, 8...
... Temperature detection device, 10 ... Operation means, 1
2... Heat retention control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure δ-sM flight cut R i'-y! +71 seasons. and 2 Figure 2

Claims (1)

[Claims] An operation means for operating the start of cooking rice and keeping warm, a heat-retaining heater for heating the pot, a temperature detection means for detecting the temperature of the pot, and a comparison of the pot temperature detected by the temperature detection means with a reference temperature, If the temperature is higher than the reference temperature, the heater is controlled to keep the pot temperature at the temperature set.
A heat-retaining rice cooker comprising a heat-retaining control means that controls not to energize a heat-retaining heater when the pot temperature is lower than a reference temperature.