JP3035588B2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker which aims to prevent the occurrence of spillage from a lid during use and to improve heating control during rice cooking.

[0002]

2. Description of the Related Art A conventional rice cooker has an inner pot housed in a main body and a main heating section for heating the inner pot, and has a cover for covering an upper opening of the main body and the inner pot. An auxiliary heating unit that heats the surface facing the inner pot is provided, and in many cases, electricity is supplied for the purpose of heating rice during the operation of keeping warm, and the auxiliary heating unit is kept at 100 ° C or less for that purpose. It is common. Japanese Patent Application Laid-Open No. 3-3927 and Japanese Patent Application Laid-Open No. 4-67818 disclose inventions and devices intended to prevent spills.
There is an official gazette, etc., in which the lid and steam holes are kept at a high temperature by the auxiliary heating unit to evaporate and decompose "neba" bubbles that cause spills. Dripping.

[0003] In addition, a thermosensitive unit and an auxiliary heating unit for keeping heat are provided on the lid, and when the lid reaches a predetermined temperature and the boiling is detected, the amount of electricity supplied to the main heating unit is reduced. −
As shown in JP-A-36922, when the steam starts to be emitted, the temperature of the temperature sensing part rapidly rises and is detected as boiling, and the amount of electricity supplied to the main heating part is slightly reduced, and there is a type that keeps the lid warm, and also used for porridge. Japanese Patent Application Laid-Open No. 63-290521 discloses a porridge thermostat in the main heating portion,
Until the temperature sensing part of the lid is turned off, rice is cooked by the main heating part, and after it is turned off, the main heating part is turned on and off with a porridge thermostat to reduce the amount of heating, so that the porridge does not stick to the bottom of the inner pot, and There is something to prevent.

[0004]

The conventional technique for preventing spills is to evaporate bubbles by the heat of the auxiliary heating section of the lid. For example, when the rice is cooked with misusing water that is much larger than the appropriate amount of water. Intense foam is generated, and the amount of heat required for evaporating the foam cannot be supplied by the auxiliary heating unit, so that the temperature of the lid rapidly drops. If the temperature of the lid falls below the boiling point of water, the effect of evaporating and popping the litter bubbles will be lost, and spillage will occur outside the body.

In the example disclosed in Japanese Utility Model Laid-Open No. 4-36922, the temperature sensing portion is detected as boiling at the same time as steam starts to be emitted, and the amount of electricity supplied to the main heating portion is reduced slightly to the extent that rice cooking is continued. There is no problem if you cook rice with a little more than the proper amount of water, but if you add water that greatly exceeds the proper amount of water due to misuse and cook rice, boiling will continue even if you detect boiling and reduce the amount of electricity, Spills out of the body.

Further, Japanese Patent Application Laid-Open No.
In the example of Japanese Patent Application Laid-Open No. 3-290521, rice heating is performed by the main heat generating portion until the temperature sensing portion of the lid is turned off, and after the heat is turned off, the main heat generating portion is turned on and off by the porridge thermostat, and the amount of heating is reduced compared to when cooking rice. Heating occurs, but boiling continues, and if water is used that is much more than the appropriate amount of water due to misuse and cooked, spilling out of the body may occur.

[0007] That is, in any of the conventional examples, although measures are taken to reduce the likelihood of spilling, since there is no configuration for detecting the occurrence of spilling, spilling occurs when a large amount of water is poured.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an inner pot stored in a main body and a main heating section for heating the inner pot. It has a lid that covers the upper opening, and this lid is provided with an auxiliary heating section and a temperature sensing section that heat the surface of the lid facing the inner pot to a predetermined temperature exceeding the boiling point of water, and receives information from the temperature sensing section. The main body has a control unit that controls the main heating unit and the auxiliary heating unit based on the control of the power supply to the main heating unit and the auxiliary heating unit during the rice cooking operation, and also detects the temperature of the temperature sensing unit, and detects the temperature of the temperature sensing unit. When the temperature drops by a certain temperature, the power supply to the main heating unit is stopped or reduced.

[0009]

According to the constitution of the present invention, when water is added to a rice which is much larger than an appropriate amount of water due to misuse and the rice is cooked, the inside of the inner pot boils due to the heat generated by the main heat generating portion, and the starch is dissolved from the rice,
When the rice comes to the lid as rice foam, the auxiliary heating unit is energized from the start of rice cooking and hits the surface facing the inner pot of the lid, which is heated to a high temperature, and the bubbles evaporate and pop and are decomposed.

[0010] Furthermore, when the amount of tongue increases, the amount of heat consumed for evaporating the bubbles increases, and the supply of heat from the auxiliary heat generating portion is insufficient, and the temperature of the lid decreases. When the temperature sensing part detects a drop above a certain temperature, it stops or lowers the energization of the main heating part and lowers the boiling momentum of the inner kettle,
The amount of toney generated is also greatly reduced, and no spills out of the body are eliminated.

That is, since a situation where a large amount of rice is being generated and is about to be spilled is directly detected by the temperature drop of the temperature sensing part, the spill does not occur even if a large amount of water is poured.

[0012]

FIG. 1 is a cross-sectional view of a rice cooker according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the temperature of a temperature sensing part and the operating condition of a current supply unit.

In FIG. 1, an inner pot 2 is detachably accommodated in a cylindrical main body 1 having an upper opening and a lid 3 for covering an upper opening of the main body 1 and the inner pot 2 is attached to be openable and closable.
A main heating section 4 for heating the inner pot 2 is provided at the bottom. On the other hand, an auxiliary heating unit 5 is provided inside the lid 3 on a surface facing the inner pot 2, and a temperature sensing unit 6 is provided near the auxiliary heating unit 5.

Further, an energizing means 7 for energizing the main heating section 4 and an energizing means 8 for energizing the auxiliary heating section 5 are provided inside the main body 1. Is provided with a control unit 9 for controlling the energization by the energization means 7 and 8 based on. The lid 3 has a steam hole 10 for allowing steam to escape to the outside.
Is provided.

Next, the operation of this embodiment having the above configuration will be described.

A user puts an appropriate amount of rice and water into the inner pot 2,
When a rice cooker switch (not shown) is operated, rice cooker is started by a command from the controller 9. The energizing means 7 operates to start energizing the main heating unit 4, and the inner pot 2 is heated. At the same time, the energizing means 8 operates, energizing the auxiliary heating unit 5 is started, and the surface of the lid 3 facing the inner pot 2 is heated. As the temperature of the lid 3 rises, the temperature of the temperature sensing section 6 also follows at substantially the same temperature.

When the temperature sensing section 6 exceeds a first preset temperature, the energizing means 8 operates according to a command from the control section 9 and the energization to the auxiliary heating section 5 is stopped. When the temperature sensing section 6 falls below the first set temperature, the auxiliary heating section 5 is energized again, and thereafter the temperature of the lid 3 is automatically adjusted to the first set temperature by this repetition. Note that the first set temperature is set to a temperature higher than the boiling point of water of about 100 ° C., which is the conventional heat retaining temperature, and in this embodiment, 130 ° C.

When the water in the inner kettle 2 boils due to the heating of the inner kettle 2 by the main heating unit 4, “neba” of starch dissolved in the water from the rice is generated, and the foam is formed into a foam. , Since the lid 3 has reached the first set temperature higher than the boiling point by the auxiliary heating unit 5, the bubbles evaporate and pop, and the inner pot 2
Since it returns to the inside, the tobacco does not blow out from the steam hole 10 of the lid 3 to the outside.

During this repetition, when the water in the inner pot 2 is eventually exhausted, the rice cooking is finished, and the energizing means 7 and 8 are operated by a command from the control section 9 to supply the main heating section 4 and the auxiliary heating section 5 with each other. The energization is stopped.

The above is the operation in the normal use state. The operation in the case where the user puts too much water into an appropriate amount of error will be described below. The main heating unit 4 and the auxiliary heating unit 5 generate heat, the lid 3 reaches the first set temperature, and the same operation as usual is performed until the inside of the inner pot 2 boils.

When the amount of water is large when boiling, the amount of generated rice is larger than usual. Therefore, when the towel hits the lid 3 and evaporates, the heat of the lid 3 is deprived. However, the amount of tongue generated is large and the tongue hits the lid 3 one after another, so that the heat of the lid 3 is steadily increased. As a result, the heat supply from the auxiliary heating unit 5 cannot catch up. As a result, the temperature of the lid 3 drops rapidly, and the temperature of the temperature sensing section 6 also drops rapidly. When the temperature of the temperature sensing section 6 suddenly drops, the control section 9 detects the bubbling in a state immediately before the spillover and activates the energizing means 7 to stop energizing the main heating section 4. Can be stopped to prevent the spill, and the temperature of the lid 3 can be raised again to the first set temperature during this time.

The sudden drop is determined by the control unit 9. After the automatic temperature adjustment is started at the first set temperature, the second set temperature (120 in the present embodiment) lower than the first set temperature. (Set to ° C) is determined to be a sharp drop. After judging that the power supply to the main heating unit 4 has stopped suddenly, the temperature of the lid 3 rises due to the heating of the auxiliary heating unit 5.
When the temperature returns to the first set temperature again,
Is operated to restart the power supply to the main heating unit 4.

[0023] By the above series of operations, only when it is likely to be spilled over, the power supply to the main heating unit 4 is stopped, the rice cooking proceeds while suppressing the generation of rice, and finally ends.

In the above embodiment, the power supply to the main heating unit 4 is stopped when the temperature of the lid 3 is suddenly decreased. However, the stop is not performed as long as the purpose of suppressing the generation of sleep can be achieved. Alternatively, the amount of current may be reduced.

Although the rapid decrease in the temperature of the lid 3 is determined based on the second set temperature, a storage means for storing the temperature of the temperature sensing section 6 is provided in the control section 9 and the temperature sensing section 6 is periodically provided at predetermined time intervals. The storage of the temperature may be updated, and when the difference from the previously stored value decreases by a certain amount or more, it may be determined that the temperature suddenly drops. That is, any method may be used as long as it stops or decreases the power supply to the main heating unit 4 when a sudden drop occurs, regardless of the method of determining the sudden drop.

The main heating section 4 is a resistance heating wire (heater).
However, the present invention is not limited to this, and the inner pot 2 may be heated using an electromagnetic induction heating coil. When the present invention is implemented in an electromagnetic induction heating type rice cooker, the generation of sleep is immediately suppressed when the power supply is stopped or reduced due to a rapid decrease in the temperature of the lid 3, which is still more effective.

[0027]

As described above, according to the present invention, the lid is provided with the auxiliary heating section and the temperature sensing section for heating the surface of the lid facing the inner pot to a predetermined temperature exceeding the boiling point of water, and the information from the temperature sensing section is provided. It has a control unit that controls the energization of the main heating unit and the auxiliary heating unit based on the control, controls the energization of the main heating unit and the auxiliary heating unit during the rice cooking operation, detects the temperature of the temperature sensing unit, and sets the lid to high temperature. To prevent the spill from falling out of the bed, prevent the spill, and detect the situation where the lid is about to spill due to a sudden drop in the temperature of the lid. Since the amount of water is reduced, even if the user puts too much water in an appropriate amount, the rice cooker can be provided with an effect of suppressing generation of squirt and providing a rice cooker that does not overflow.

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram showing a temperature of a temperature sensing part of the rice cooker and an operation state of a current supply unit.

[Explanation of symbols]

 3 lid 4 main heating section 5 auxiliary heating section 6 temperature sensing section 9 control section

Claims (2)

(57) [Claims] 1. An inner pot contained in a main body and a main heating section (4) for heating the inner pot, a lid (3) for covering an upper opening of the main body and the inner pot, and a lid (3). An auxiliary heating section (5) and a temperature sensing section (6) for heating the surface of the lid facing the inner pot to a predetermined temperature exceeding the boiling point of water are provided, and main heating is performed based on information from the temperature sensing section (6). In the rice cooker having a control unit (9) for controlling the power supply to the unit (4) and the auxiliary heating unit (5), the control unit (9) includes a main heating unit (4) and an auxiliary heating unit (5) during the rice cooking operation.
When the temperature of the temperature sensing part (6) falls by a certain temperature, the temperature of the temperature sensing part (6) is detected.
A rice cooker characterized in that energization of the main heating section (4) is stopped. 2. The rice cooker according to claim 1, wherein the control section (9) reduces the amount of electricity supplied to the main heating section (4) when the temperature of the temperature sensing section (6) drops by a certain temperature.