JPH10286171A - Guided heating-type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly detect the internal temp. of a lid body by providing lid body structure being attachable/detachable to/from a container mainbody. SOLUTION: The container mainbody 1 is provided with a guided heating coil 8, a first side coil 6, a control part 5 and a signal receiving part 7. The lid body 2 is provided with a secondary side coil positioned in the magnetic field of the first side coil, a lid temp. sensor 11 and a signal transmitting part 13. The sensor control part 12 of the lid body 2 is driven based on guided electromotive force in the secondary side coil 9, the internal temp. of the lid body 2 is detected by the lid temp. sensor 11 and a detection signal is outputted from the signal transmitting part 13. The control part 5 of the container mainbody 1 receives the signal from the signal transmitting part 13 by the signal receiving part 7 so as to adjust conductive rate to the first side coil 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type rice cooker.

[0002]

2. Description of the Related Art Conventionally, an induction heating type rice cooker is provided with a lid heater in order to prevent dew from being formed on the inner surface of a lid by steam generated during rice cooking. The lid is rotatably connected to the container body. The lid heater is energized and controlled based on the inner pot temperature detected by a temperature sensor provided on the container body side.

[0003]

However, since the lid has a structure rotatably connected to the container body,
It cannot be removed and washed. Since dew adheres to the inner surface of the lid as described above, a structure that can be washed in a round shape is desired.

Further, the temperature sensor provided on the container body cannot accurately detect the inner surface temperature of the lid. For this reason,
Insufficient exposure of the inside of the lid may be inadequate, or conversely, overheating may adversely affect cooked rice,
It is difficult to control the energization of the lid heater.

[0005] Therefore, an object of the present invention is to provide an induction heating type rice cooker in which the lid can be detachably attached to the container body and the inner surface temperature of the lid can be accurately detected.

[0006]

In order to achieve the above object, according to the present invention, an inner pan is removably accommodated in an accommodation chamber formed by a container body and a lid, and an inner space of the container body is In an induction heating rice cooker including an induction heating coil for induction heating the inner pot and a control unit for the induction heating coil, a primary coil controlled to be energized by the control unit in the container body, The control section is provided with a signal receiving section for outputting a reception signal, while the lid is provided with the signal receiving section.
A secondary coil located in the magnetic field of the secondary coil, a lid temperature sensor for detecting an inner surface temperature of the lid, a signal transmitting unit for transmitting a signal to the signal receiving unit, and induction by the secondary coil A sensor control unit for transmitting a detection signal from the lid temperature sensor from the signal transmission unit to the signal reception unit based on the electromotive force.

[0007] According to the induction-heated rice cooker having the above configuration, 1
When the secondary coil is energized, an induced electromotive force is generated in the secondary coil, and the detection signal is transmitted from the signal transmission unit to the signal reception unit in a non-contact manner. The inner surface temperature can be detected.

In the induction heating type rice cooker, it is preferable that a lid heater is connected to the secondary coil in that the inner surface temperature of the lid can be directly adjusted.

Further, if the control section controls the energization to the lid heater via the primary side coil and the secondary side coil based on the detection signal from the lid temperature sensor, the inner surface temperature of the lid body is reduced. The temperature can be adjusted based on the directly detected result. Therefore, the dew attached to the inner surface of the lid can be reliably removed, and the cooked rice is not adversely affected.

Further, the control section may determine whether or not the lid is closed based on the presence or absence of an input signal to the signal receiving section. With this configuration, if there is no input signal to the signal receiving unit, it can be determined that the lid is removed or open, and if there is an input signal, it can be determined that the lid is closed. Therefore, it can be detected that rice cooking is started with the upper part of the container body kept open without adding an extra configuration.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view of an induction heating rice cooker according to the present invention. This induction heating rice cooker includes a container body 1, a lid 2, and an inner pot 3.

The container body 1 has a bottomed cylindrical shape having a protective frame 4 in which the inner pot 3 is removably accommodated. The control unit 5 is disposed below the inner space of the container body 1. Also,
A primary coil 6 and a signal receiving unit 7 are provided on the inner surface of the upper end shoulder of the container body 1. An induction heating coil 8 is provided on the bottom surface of the protection frame 4. The primary-side coil 6 and the induction heating coil 8 are controlled to be energized by the control unit 5 as described later.

The lid 2 is rotatably and detachably connected to the container body 1 by a hinge (not shown). The lid 2 has a hermetically sealed structure, and has a secondary coil 9, a lid heater 10, a lid temperature sensor 1
1, a sensor control unit 12 and a signal transmission unit 13 are provided. The secondary side coil 9 is provided so as to face the primary side coil 6 of the container body 1, so that the primary side coil 6
Are located in the magnetic field of. Therefore, the primary coil 6
When a high-frequency current is supplied to the secondary coil 9, an induced electromotive force is generated in the secondary coil 9. The lid heater 10 is disposed so as to be in contact with the inner surface of the lid 2, and directly heats the inner surface of the lid 2 by an induced electromotive force generated in the secondary coil 9. The lid temperature sensor 11 is disposed near the lid heater 10 and is
Directly detects the inner surface temperature of the A thermistor is used for the lid temperature sensor 11, and the electrical resistance value changes according to the change in the inner surface temperature of the lid 2. The sensor control unit 12 includes a power supply circuit unit 12a and a transmission circuit unit 12b, and is driven by the induced electromotive force generated in the secondary coil 9. And
A change in the electric resistance value at the lid temperature sensor 11 is read, and the detection result is frequency-converted. The signal transmission unit 13 is provided to face the signal reception unit 7 of the container main body 1, and receives a transmission frequency from the sensor control unit 12 and transmits the signal to the signal reception unit 7.

Next, a control unit 5 provided in the container body 1
Will be described.

When receiving an input signal from a rice cooker switch (not shown), the control unit 5 energizes the induction heating coil 8 to start induction heating of the inner pot 3. In addition, the primary coil 6 is energized to generate an induced electromotive force in the secondary coil 9, and the lid heater 10 starts heating the inner surface of the lid 2. During this time, the detection of the inner surface temperature of the lid 2 by the lid temperature sensor 11 is continued, and the detected temperature is read in a non-contact manner via the signal transmitting unit 13 and the signal receiving unit 7. Then, based on the detection result, the power supply to the induction heating coil 8 and the primary side coil 6 is controlled. However, if there is no signal received by the signal receiving unit 7,
The signal transmission unit 13 is separated from the signal reception unit 7 and it is determined that the lid 2 is not closed, and the coils 6 and 8 are not energized and rice cooking does not start. In this case, the user is notified by a buzzer, a lamp, or the like.

When the rice is cooked in this way, the power supply to the induction heating coil 8 is stopped and the rice is steamed. However,
The energization control of the primary coil 6 is continued, and the lid 2 is heated by the lid heater 10 to prevent dew from adhering to the inner surface. Thus, even if the user opens the lid 2, dew does not scatter and wet the surroundings such as a table.

Thereafter, when the steaming of the rice is completed, the rice is kept at a constant temperature. When the power supply to the primary coil 6 is stopped and the heating by the lid heater 10 is stopped in the course of rice cooking and heat retention, it is sufficient to drive the sensor control unit 12 to the primary coil 6 at predetermined time intervals. For a short time. Thereby, the temperature can be detected by the lid temperature sensor 11 without heating the inner surface of the lid 2 by the lid heater 10.

The lid 2 may be provided with a rechargeable battery or the like. Thus, even after the heating by the lid heater 10 is stopped, the inner surface temperature of the lid can be detected by the lid temperature sensor 11.

[0020]

As is apparent from the above description, according to the induction heating rice cooker according to the present invention, the lid temperature sensor and the signal driven on the lid body based on the induced electromotive force of the secondary coil are provided. Since the transmitting section is provided and the signal receiving section for receiving the signal from the signal transmitting section in a non-contact manner is provided in the container main body, the lid can be configured to be detachable from the container main body. Therefore, if a closed structure is adopted for the lid, it is possible to make the structure capable of being washed whole. Further, since the inner surface temperature of the lid can be directly detected by the lid temperature sensor, the detection accuracy is high.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an induction heating rice cooker according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 3 Inner pan 5 Control part 6 Primary coil 7 Signal receiving part 8 Induction heating coil 9 Secondary coil 11 Lid temperature sensor 12 Sensor control part 13 Signal transmitting part

Claims (4)

[Claims] 1. An inner pot is removably accommodated in an accommodation chamber formed by a container body and a lid, and an inner space of the container body is
In an induction heating type rice cooker provided with an induction heating coil for induction heating the inner pot and a control unit for the induction heating coil, the energization of the container body is controlled by the control unit.
A secondary coil and a signal receiving unit that outputs a reception signal to the control unit are provided. On the lid, a secondary coil located in a magnetic field of the primary coil and an inner surface temperature of the lid are provided. A lid temperature sensor for detecting, a signal transmitting section for transmitting a signal to the signal receiving section, and a signal receiving section for detecting a signal from the lid temperature sensor based on an induced electromotive force in the secondary coil from the signal transmitting section. An induction heating type rice cooker, comprising: a sensor control unit for transmitting the electric signal to a rice cooker. 2. The induction heating rice cooker according to claim 1, wherein a lid heater is connected to the secondary coil. 3. The controller according to claim 1, wherein the control unit controls power supply to the lid heater via a primary coil and a secondary coil based on a detection signal from the lid temperature sensor. 3. The induction-cooked rice cooker according to 2. 4. The control unit according to claim 1, wherein the control unit determines whether the lid is closed based on the presence or absence of an input signal to the signal receiving unit. Induction heating type rice cooker according to 1.