JP2571941Y2 - 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 provided with a side heating device and a lid heating device for preventing dew condensation on the inner surface of the lid .

[0002]

2. Description of the Related Art In a conventional rice cooker, a container accommodated in a container body so as to be insertable and removable, a lid for opening and closing an upper opening of the container body, and a container body positioned below the container. A rice cooker provided in the container, a side heater provided in the vessel body located on the upper side of the container, and a lid provided on the lid body located above the container. And a lid heater for keeping the unit warm, and controls the cut-off power of the input of the rice cooking heater via a relay based on the output of a temperature sensor that detects the temperature of the container during rice cooking.
When the temperature is kept warm, in a relay open state, a series circuit of the body, the lid heater, and the rice cooker is controlled to cut off power based on the output of the temperature sensor.

However, such a rice cooker has no dew condensation suppressing structure and performs a rice cooking operation by energizing only a rice cooking heater located below a container. There is a problem that condensation occurs on the inner surface of the lid due to a decrease in body temperature.
To solve this problem, a rice cooker configured to prevent the occurrence of dew condensation by heating the lid by energizing the rice cooker and at least the lid heater during rice cooking is disclosed in Japanese Patent Publication No. 59-7446. And so on. That is, in this type of rice cooker, a lid heater is connected between the power supply terminals to keep the lid heater in a constantly energized state, and a common switch for switching to each power supply terminal according to the temperature of the container. A terminal is connected, and a series circuit of a rice heating heater, a body heater, and a heat-sensitive element is connected between the switching terminals of the respective changeover switches. By the switching operation of the two switches, both the lid heater and the rice cooker are energized and controlled during rice cooking, while the lid heater is energized and controlled during heat retention, and the body heater is turned on and off by the heat-sensitive element. The body surface is always heated by a lid heater.

[0004]

In the above-mentioned prior art, the lid heater is always energized not only during rice cooking but also during warming , so that when the amount of cooked rice is small, when the room temperature is high, or when the commercial power supply voltage is low. If the temperature is high, the rice top surface in the container will be overheated during the heat retention , which causes the rice surface to dry and cause yellow discoloration, and oxidation progresses to give off a bad smell. there were. In addition, using a microcomputer as a means to solve such problems,
Cook rice according to the amount of cooked rice with a relay or triac, etc.
It is also conceivable to control the cut-off of each heater of the body and the lid, but since a drive circuit for controlling the relay and the triac is required, not only the circuit configuration is complicated and cost increases, but also There was a problem that much time had to be spent for creating a microcomputer program.

Therefore, the present invention solves the above problems,
An object of the present invention is to provide a rice cooker that can prevent excessive heating by a lid heating device without complicating a circuit configuration.

[0006]

According to the present invention, there is provided a container which is removably accommodated in a container body, a lid for opening and closing an upper opening of the container body, and a bottom heating device provided in the container body. ,
A side heating device provided on the side of the container, a lid heating device provided on the lid, a bottom heating cutoff device for passing electricity through the bottom heating device, and the side heating device And a side lid heating / disconnecting means for passing / disconnecting electricity in a parallel circuit of the heating device and the lid heating device, and heating the container with the bottom heating device, the side heating device and the lid heating device during rice cooking. During the heat retention, the side heating device and the lid heating device are passed through a parallel circuit.
The container is controlled to a predetermined heat retaining temperature by the side lid heating / disconnecting means that cuts off the power.

[0007]

With the above arrangement, during rice cooking, the entire container is uniformly heated by the bottom heating device, the side heating device and the lid heating device, and the inner surface of the lid is heated. Dew condensation occurring on the inner surface is suppressed.
In addition, during the heat retention operation, the lid heating device is controlled to be turned on and off by the side lid heating / disconnecting means in conjunction with the side heating device, so that the upper surface of the rice in the container is not overheated and the lid is not overheated. The inner surface of the body is properly heated. Moreover, when keeping warm,
The parallel circuit of the side heating unit and the lid heating unit
Since it is configured to turn off and on by means of thermal cutoff,
Side lid heating with common side heating and lid heating
The power is cut off by the power cutoff means, and the circuit configuration is
Does not complicate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a rice cooker,
In FIG. 1, reference numeral 1 denotes a vessel body having an open upper surface, and the vessel body 1 includes an inner case 2, an outer case 3, and the like.
A container 4 having an open upper surface is housed in the container body 1 so as to be able to be inserted and removed. 5 is a lid, and this lid 5 is
And an inner lid 7 provided below the outer lid 6 to open and close the upper opening of the container 4. At the bottom of the inner case 2, a rice cooker 8 as a bottom heating device as a means for heating the container 4 from below is provided, and on the outer peripheral surface of the inner case 2, the container 4 is heated from the side. A body heater 9 serving as a side heat retaining heater is provided as a side heating device. Further, a lid heater 10 serving as a lid heating heater serving as a lid heating device that mainly heats the inner lid 7 is provided in a lower portion inside the outer lid 6. Reference numeral 11 denotes a changeover switch provided as a changeover control means provided at the bottom of the inner case 2,
When the temperature of the bottom of the container 4 reaches about 130 ° C. due to a temperature-sensitive ferrite (not shown) or the like, the changeover switch 11 automatically switches the position of the contact. On the side of the inner case 2, there is mounted an automatic temperature controller 12, which is a side cover heating cutoff means for controlling the heat retention temperature, such as a thermal reed switch (TRS). This automatic temperature controller
12 is about 73 ° C. where the temperature of the container 4 is kept at the optimum temperature from normal temperature.
, And turns off at higher temperatures.

Next, the configuration of the electric circuit will be described with reference to FIG. A plug 13 that allows connection to an outlet (not shown) has a common terminal 14 of the changeover switch 11 at one end.
Is connected. The rice cooker 8 is connected between one of the changeover terminals 15 of the changeover switch 11 and the other end of the plug 13.
Is inserted and connected. On the other hand, the thermostat 12 has a plug 13
Is connected between the other end of the switch 11 and the other switching terminal 16 of the changeover switch 11, and a parallel circuit of the body heater 9 and the lid heater 10 is inserted and connected between the switching terminal 16 and the other end of the plug 13. You. The power consumption of the rice cooker 8 is 80
0W, power consumption of body heater 9 is 47W, lid heater 10
Has a power consumption of 19W. The changeover switch 11 also has a function as a bottom heating cutoff device for switching the position of the contact according to the temperature of the bottom of the container 4 to cut off the electric current through the rice cooker 8.

Next, the operation of the above configuration will be described with reference to the graph of FIG. In FIG. 3, the upper graph shows a temperature change in the container 4 after the start of the rice cooking operation, and the lower graph shows the rice cooker 8 and the body heater 9.
3 shows the timing of power cut-off of the lid heater 10.

A rice cooking operation is started by housing a container 4 containing rice and water in an inner case and pressing a rice cooking key (not shown). At the start of rice cooking, since the temperature at the bottom of the container 4 is 130 ° C. or less, the changeover switch 11
Are located at positions indicated by solid lines in FIG. That is,
Since the common terminal 14 and the respective switching terminals 15 and 16 are closed, the selector switch 11 is connected to the rice cooker 8 via the plug 13.
The body heater 9 and the lid heater 10 are continuously energized, whereby the bottom, sides and upper surface of the container 4 and the lid 5 are heated at 866 W which is the total power consumption of the heaters 8, 9, and 10, and the lid 5 is heated. 5 The dew condensation generated on the inner surface is suppressed.

Next, when the temperature of the bottom of the container 4 reaches 130 ° C. by continuing the rice cooking operation, the changeover switch 11 switches its contact to the position shown by the broken line in FIG. 15 and 16 are open. That is, the power supply to the rice cooking heater 8 is cut off, and the temperature of the container 4 is changed to a state in which the body heater 9 and the lid heater 10 are turned on after the common terminal 14 of the changeover switch 11 and the respective changeover terminals 15 and 16 are opened. Once the power is cut off, the temperature drops to 73 ° C., and thereafter, the automatic temperature controller 12 repeats the power cut-off at 66 W, which is the sum of the power consumption of the body heater 9 and the lid heater 10, and the predetermined warming temperature of 73 ° C. Is kept. At this time, the lid heater 10 is turned on and off by the automatic temperature controller 12 in conjunction with the body heater 9, so that when the amount of cooked rice is small, the container 4
The heat capacity in the container 4 is small and the on-time is short. Conversely, when the amount of cooked rice is large, the heat capacity in the container 4 is small and the on-time is long. When the room temperature is high and the required heating amount in the container 4 is small, or when the commercial power supply voltage supplied to the plug 13 is high and the inside of the container 4 can be heated in a short time, the lid heater may be used. On time of 10 is shorter, and conversely,
When the room temperature is low and the required amount of heating in the container 4 is large, or when the commercial power supply voltage is low and it takes time to heat the inside of the container 4, the ON time of the lid heater 10 becomes longer and The lid heating control by the lid heater 10 is performed in conjunction with the heat retention control by the body heater 9 according to the conditions and environmental conditions.

As described above, according to the above embodiment, the rice cooker 8, the body heater 9 and the lid heater 10 can uniformly heat the entire container 4 and cook the inner surface of the lid 5 during the rice cooking. By heating at 10, dew condensation occurring on the inner surface of the lid 5 can be suppressed. In addition, the contact position of the changeover switch 11 is switched at the time of heat retention,
The lid heater 10 is turned on and off by the automatic temperature controller 12 in conjunction with the body heater 9, so that the top surface of the rice in the container 4 can be adjusted according to various conditions such as fluctuations in the amount of rice cooked, room temperature fluctuations in the outside air, and voltage fluctuations. The inner surface of the lid 5 is appropriately heated without excessive heating. That is, in the present embodiment, the changeover switch 11 for turning off the rice cooker 8 and the automatic temperature controller 12 for turning off the parallel circuit of the body heater 9 and the lid heater 10.
The two lids are provided when cooking rice.
While you can reduce the dew condensation on the inner surface of the lid 5 immediately after cooking by heating the body 5, the condensation on the inner surface of the lid 5 by heating the lid 5 without the lid 5 is heated excessively at the time of insulation Can be reduced. In addition, at the time of heat retention, body heater 9 and lid heater
The parallel circuit with 10 turns off the power with the automatic temperature controller 12.
So that the body heater 9 and the lid heater 10
The power is cut off by the common thermostat 12.
Ri, without complicating the circuit configuration can be reduced condensation on the inner surface of the lid 5 in immediately after cooking and warmth.

Further, the control of the lid heater 10 in the present embodiment uses a microcomputer, a relay, a triac or the like as in the conventional example, and controls the respective heaters of the rice cooker, the body and the lid according to the amount of rice cooked via a drive circuit. Unlike the controlling device, the mechanical changeover switch 11 and the automatic temperature controller 12, which are automatic switches, can be realized with an inexpensive and simple circuit configuration.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the automatic temperature controller is not limited to a thermal reed switch, and various thermosensitive elements may be used.

[0016]

According to the present invention, there is provided a container which is removably accommodated in a container body, a lid for opening and closing an upper opening of the container body, a bottom heating device provided in the container body, and A side heating device provided on the side, a lid heating device provided on the lid body, a bottom heating cutoff means for cutting off electricity through the bottom heating device, the side heating device and the lid With a side lid heating cutoff means for cutting off electricity through the parallel circuit with the heating device,
Wherein at the time of cooking bottom heating device, heating the vessel at the side heating and lid heater, at the time it kept the side pressure
The container is controlled to a predetermined heat-retaining temperature by the side lid heating / disconnecting means for disconnecting electricity through a parallel circuit of a heating device and a lid heating device , so that the circuit configuration is complicated. To prevent excessive heating by the lid heating device,
It can provide a possible cooker reducing the condensation on the lid inner surface during cooking immediately and kept warm.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram of the same.

FIG. 3 is a graph showing a power cut-off timing and a temperature change of the heater.

[Description of Signs] 1 Main body 4 Container 5 Lid 8 Rice-cooking heater (bottom heating device) 9 Lid heater (lid heating device) 10 Body heater (side heating device) 11 Changeover switch (bottom heating disconnection means) 12 Automatic temperature controller (side lid heating / disconnecting means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A container housed in a container body so as to be insertable and removable,
A lid for opening and closing the upper opening of the container body, a bottom heating device provided on the container body, a side heating device provided on the side of the container, and a lid provided on the lid A heating device, a bottom heating cutoff means for cutting off the bottom heating device, a side lid heating cutoff device for cutting off the parallel circuit of the side heating device and the lid heating device, wherein the at the time of cooking bottom heating device, heating the vessel at the side heating and lid heater, and the side heating device at the time of insulation
A rice cooker characterized in that the container is controlled to a predetermined heat-retaining temperature by the side lid heating / disconnecting means that cuts off electricity in a parallel circuit with the lid heating device.