JP4701930B2 - Induction heating rice cooker - Google Patents

Description

  The present invention relates to an induction heating rice cooker that heats a pot and a container that generates steam by induction heating.

  Traditionally, rice cookers have lid heating that heats the lid at the end of cooking or at the time of heat retention so that moisture condenses on the lid and the side of the pan and does not drip on the rice and cause whitening or stickiness. It has a side heating means for heating the means and the side portion of the pan (for example, see Patent Document 1).

  The lid heating means and the side heating means are induction-heated by the magnetic field generated from the heating coil, ie, the lid heating coil that heats the lid and the side heating coil that induction heats the side of the pot. And it is well-known to provide the inverter circuit which supplies a high frequency current to this lid | cover heating coil and a side surface heating coil (for example, refer patent document 2).

  Moreover, it has a pan, a pan heating means for heating the pan, a lid covering the opening of the pan, and a steam generating means, and the steam generating means has a water tank and a water tank heating means. (For example, refer to Patent Document 3).

  On the other hand, when heating a pan or a water tank by induction heating as described above, it has been reported that the leakage magnetic field generated from the heating coil has an unfavorable effect on the human body. ing.

As a method for effectively reducing the leakage magnetic field in the low frequency region of the leakage magnetic field, a heating coil wound in a spiral shape is connected in series on the outer peripheral side of the heating coil and the heating coil is used. There is disclosed a method of reducing a magnetic field leaking to the outside by being configured with a leakage magnetic field canceling coil that is wound in a direction opposite to that of a coil and flows a current in the opposite direction (see, for example, Patent Document 4).
Japanese Patent Publication No. 8-13289 Japanese Patent Laid-Open No. 5-261010 JP 2003-144212 A JP 2003-144308 A

  However, in the configuration of the above conventional example, in order to reduce the leakage magnetic field generated from the container heating coil for heating the container (water tank) and the side heating coil for heating the side surface of the pan, the coil is wound in the opposite direction to the container heating coil. It is necessary to provide a leakage magnetic field canceling coil for flowing a reverse current and a leakage magnetic field canceling coil wound in the opposite direction to the side heating coil and for flowing a reverse current.

  At this time, if the distance between each heating coil and the leakage magnetic field canceling coil is too close, the magnetic field generated from each coil is reversed, so the magnetic fields that originally heat the sides of the container and pan are canceled out. It will happen. Therefore, the leakage magnetic field canceling coil does not contribute to the heating of the container and the side surface of the pan, and conversely reduces the heating efficiency.

  Moreover, in order to arrange each leakage magnetic field canceling coil so as not to cancel the magnetic field for heating the container and the side of the pan, it is necessary to secure a certain distance from each heating coil, and the outer shape of the rice cooker body is large. Had the problem of becoming.

  The present invention solves the above-mentioned conventional problems, without increasing the outer shape of the rice cooker body, and without lowering the heating efficiency of the container and the side of the pan, effectively and inexpensively from the container heating coil and the side heating coil. It aims at providing the induction heating type rice cooker which can reduce the leakage magnetic field of the low frequency area | region which generate | occur | produces.

In order to achieve the above-mentioned object, the present invention stores a pot for putting rice and water in the rice cooker body, provides a container for generating steam in the rice cooker body, and heats the container heating coil. It is configured to supply high-frequency current from the inverter circuit to the side heating coil that heats the side of the pan, and the container heating coil and the side heating coil are connected in series, and high-frequency current is applied to cancel each other's low-frequency leakage magnetic field. It is connected to flow in the opposite direction.

  Thereby, since the low frequency leakage magnetic field generated from the container heating coil and the side surface heating coil is reversed, the low frequency leakage magnetic field can be canceled each other, and without increasing the outer shape of the rice cooker body, And the leakage magnetic field of the low frequency area | region which generate | occur | produces from a container heating coil and a side surface heating coil can be reduced cheaply and effectively, without reducing the heating efficiency of a pan side surface.

  In the induction heating type rice cooker of the present invention, since the container heating coil and the side heating coil cancel each other's low frequency leakage magnetic field, a new coil for canceling the leakage magnetic field is not required, and the outer shape of the rice cooker body is increased. The low frequency leakage magnetic field can be reduced without reducing the heating efficiency of the container and the side of the pan.

1st invention is a rice cooker main body, the pot accommodated in the inside of this rice cooker main body, and the rice which puts water with water, the container which produces | generates the steam provided in the said rice cooker main body, and the container heating which heats this container A coil, a side heating coil that heats the side of the pan, and an inverter circuit that supplies a high-frequency current to the container heating coil and the side heating coil, the container heating coil and the side heating coil are connected in series, In addition, in order to cancel each other's low frequency leakage magnetic field, the high frequency current is connected in the opposite direction. Low frequency leakage magnetic field can be canceled, leakage coil cancellation coil is not required for each of the container heating coil and the side heating coil, and the rice cooker body is enlarged. And no, it is possible to provide an induction heating cooker which can reduce the low frequency leakage magnetic field.

2nd invention is a rice cooker main body, the pot which is accommodated in the inside of this rice cooker main body, and puts rice and water, the container which produces | generates the steam provided in the said rice cooker main body, and the container heating which heats this container A coil, a side heating coil for heating the side of the pan, and an inverter circuit for supplying a high frequency current to the container heating coil and the side heating coil, and connecting the container heating coil and the side heating coil in parallel. In addition, in order to cancel each other's low frequency leakage magnetic field, the high frequency current is connected in the opposite direction. Low frequency leakage magnetic field can be canceled, leakage coil cancellation coil is not required for each of the container heating coil and the side heating coil, and the rice cooker body is enlarged. And no, it is possible to provide an induction heating cooker which can reduce the low frequency leakage magnetic field.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1: shows sectional drawing of the induction heating type rice cooker in Embodiment 1 of this invention.

  As shown in FIG. 1, the rice cooker main body 1 is provided with a pan storage portion 3 that can detachably store a pan 2 into which rice and water are placed, and a bottom portion of the pan 2 is disposed outside the pan storage portion 3. The bottom heating coil 4 wound in a spiral shape is disposed so as to face the bottom, and the bottom portion of the pan 2 is induction-heated by a magnetic field generated from the bottom heating coil 4. Furthermore, a side heating coil 5 wound in a cylindrical shape so as to face the side surface of the pan 2 is provided, and the side portion of the pan 2 is induction-heated by a magnetic field generated from the side heating coil 5.

  The rice cooker main body 1 has a water container (container) 7 that is detachable and generates steam in a substantially bottomed cylindrical shape, a water container storage portion 6 that stores the water container 7, and a container heating coil 8. Steam generating means is provided, and the water container 7 is induction-heated by a magnetic field generated by the container heating coil 8. Moreover, when the positional relationship of the side surface heating coil 5 and the container heating coil 8 is seen from the top of the rice cooker main body 1, it has arrange | positioned to the line object.

  Further, a bottom inverter circuit 13 (see FIG. 2) for supplying a high-frequency current to the bottom heating coil 4 and a body container inverter circuit for supplying a high-frequency current to the side surface heating coil 5 and the container heating coil 8 are provided below the rice cooker body 1. 14 (see FIG. 2) is disposed. Furthermore, a control board 9 on which a control circuit for controlling the bottom inverter circuit and the trunk container inverter circuit and an operation key for operating the rice cooker are arranged inside the outer lid.

  FIG. 2 is a partial circuit diagram of the induction heating rice cooker according to the first embodiment of the present invention that is partly blocked.

  As shown in FIG. 2, when the rice cooker body 1 is connected to the commercial power supply 11, the bottom inverter circuit 13 and the trunk container inverter circuit (inverter circuit) 14 are connected to the DC via the full-wave rectifier 12 mounted on the heating substrate 10. Power is supplied. The bottom heating circuit 4 is connected to the bottom inverter circuit 13, and the bottom inverter circuit 13 supplies a high frequency current IL 1 to the bottom heating coil 4. Further, the side surface heating coil 5 and the container heating coil 8 are connected in series to the body container inverter circuit 14, and the body container inverter circuit 14 supplies a high frequency current IL 2 to the side surface heating coil 5 and the container heating coil 8.

  Here, the bottom heating coil 4, the side surface heating coil 5, and the container heating coil 8 indicate the direction in which the rice cooker body 1 is wound when viewed from above. That is, the bottom heating coil 4 is wound so that the high-frequency current IL1 flows clockwise. Further, the side surface heating coil 5 is wound so that the high-frequency current IL2 flows clockwise, and the container heating coil 8 is wound so that the high-frequency current IL2 flows counterclockwise.

  The control circuit 15 mounted on the control board 9 controls the energization state and the oscillation frequency of the bottom inverter circuit 13 and the trunk container inverter circuit 14 on the heating board 10.

  The operation and action of the above configuration will be described. When the pan 2 and the water container 7 are set at predetermined positions on the rice cooker main body 1 and the operation keys are operated, the control circuit 15 is configured so that the bottom part, the side part, and the container heating part of the pan 2 are set based on a preset rice cooking sequence. The operations of the bottom inverter circuit 13 and the shell container inverter circuit 14 are controlled so as to heat the heater.

  When the control circuit 15 controls the heating of the side surface portion of the pan 2 and the container heating unit, the control circuit 15 sends a drive signal to the body container inverter circuit 14, and the body container inverter circuit 14 sends the high frequency current IL 2 to the side surface heating coil 5 and the container heating coil 8. Supply.

  At this time, the high-frequency current IL2 flows clockwise in the side surface heating coil 5 as viewed from the top of the rice cooker body 1, and flows in the counterclockwise direction in the container heating coil 8 when viewed from the top of the rice cooker body 1.

  That is, the side heating coil 5 and the container heating coil 8 are flowing the same current in opposite directions, and the magnetic field generated by the side heating coil 5 and the magnetic field generated by the container heating coil 8 are in opposite directions. The magnetic field that leaks to the outside of the rice cooker body 1 by canceling out the generated magnetic field can be reduced.

  As described above, in the present embodiment, the side surface heating coil 5 and the container heating coil 8 are connected in series and the high frequency current IL2 is wound so as to flow in the opposite direction. A low frequency region generated from the container heating coil 8 and the side heating coil 5 without the need to increase the outer shape of the rice cooker body 1 because the magnetic field can be canceled and a new coil for canceling the leakage magnetic field is not required. The leakage magnetic field can be reduced.

(Embodiment 2)
FIG. 3 shows a partial circuit diagram of a part of the induction heating rice cooker according to the second embodiment of the present invention.

  As shown in FIG. 3, when the rice cooker body 1 is connected to the commercial power supply 11, DC power is supplied to the bottom inverter circuit 13 and the trunk container inverter circuit 14 via the full-wave rectifier 12 mounted on the heating substrate. . The bottom heating circuit 4 is connected to the bottom inverter circuit 13, and the bottom inverter circuit 13 supplies a high frequency current IL 1 to the bottom heating coil 4. Further, the side surface heating coil 5 and the container heating coil 8 are connected in parallel to the body container inverter circuit 14, and the body container inverter circuit 14 supplies the high-frequency current IL 2 to the side surface heating coil 5 and the container heating coil 8.

  Here, the bottom heating coil 4, the side surface heating coil 5, and the container heating coil 8 indicate the direction in which the rice cooker body 1 is wound when viewed from above. That is, the bottom heating coil 4 is wound so that the high-frequency current IL1 flows clockwise. Further, the side surface heating coil 5 is wound so that a part of the high frequency current IL2 flows in the clockwise direction, and the container heating coil 8 is subtracted from the high frequency current IL2 through the side surface heating coil 5. Winding so that the current IL4 flows counterclockwise.

  The control circuit 15 mounted on the control board controls the energization state and the oscillation frequency of the bottom inverter circuit 13 and the trunk container inverter circuit 14 on the heating board. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When the pan 2 and the water container 7 are set at predetermined positions on the rice cooker main body 1 and the operation keys are operated, the control circuit 15 is configured so that the bottom part, the side part, and the container heating part of the pan 2 are set based on a preset rice cooking sequence. The operations of the bottom inverter circuit 13 and the shell container inverter circuit 14 are controlled so as to heat the heater.

  When the control circuit 15 controls the heating of the side surface portion of the pan 2 and the container heating unit, the control circuit 15 sends a drive signal to the body container inverter circuit 14, and the body container inverter circuit 14 sends the high frequency current IL 2 to the side surface heating coil 5 and the container heating coil 8. Supply.

  At this time, among the high-frequency current IL2, the current IL3 flows clockwise in the side surface heating coil 5 when viewed from the top of the rice cooker body 1, and the current IL4 obtained by subtracting the current IL3 flowing in the side surface heating coil 5 from the high-frequency current IL2 is the container. The heating coil 8 flows counterclockwise as viewed from the top of the rice cooker body 1.

  That is, the current IL3 flowing through the side surface heating coil 5 and the current IL4 flowing through the container heating coil 8 are flowing in opposite directions, and the magnetic field generated by the side surface heating coil 5 and the magnetic field generated by the container heating coil 8 are in opposite directions. Therefore, it is possible to reduce the leakage magnetic field leaking outside the rice cooker body 1 by canceling out the magnetic fields generated from each other.

  As described above, in the present embodiment, the side surface heating coil 5 and the container heating coil 8 are connected in parallel, and the high frequency currents IL3 and IL4 are wound so as to flow in opposite directions. Since the frequency leakage magnetic field can be canceled out and a new coil for canceling the leakage magnetic field is not required, there is no need to increase the outer shape of the rice cooker body 1, and the low generated from the container heating coil 8 and the side heating coil 5 The leakage magnetic field in the frequency domain can be reduced.

  As described above, the induction heating rice cooker according to the present invention does not require a new coil for canceling the leakage magnetic field, because the container heating coil and the side heating coil cancel each other's low frequency leakage magnetic field. Without increasing the outer shape of the vessel body, the leakage magnetic field in the low frequency region generated from the container heating coil and side heating coil can be reduced. Useful as a rice cooker.

Sectional drawing of the induction heating type rice cooker in Embodiment 1 of this invention. Part of the circuit diagram of the induction heating rice cooker The principal part circuit diagram which made the induction heating type rice cooker in Embodiment 2 of this invention into a partial block

1 Rice cooker body 2 Pan 5 Side heating coil 7 Water container (container)
8 Container heating coil 14 Torso container inverter circuit (inverter circuit)

Claims (2)

A rice cooker body, a pot for storing rice and water stored in the rice cooker body, a container for generating steam provided in the rice cooker body, a container heating coil for heating the container, and the pot A side heating coil that heats the side, and an inverter circuit that supplies high-frequency current to the container heating coil and the side heating coil, the container heating coil and the side heating coil are connected in series, and each has a low frequency Induction heating rice cooker connected so that high-frequency current flows in the opposite direction to cancel the leakage magnetic field . A rice cooker body, a pot for storing rice and water stored in the rice cooker body, a container for generating steam provided in the rice cooker body, a container heating coil for heating the container, and the pot A side heating coil that heats the side, and an inverter circuit that supplies a high-frequency current to the container heating coil and the side heating coil, the container heating coil and the side heating coil are connected in parallel, and each has a low frequency. Induction heating rice cooker connected so that high-frequency current flows in the opposite direction to cancel the leakage magnetic field .