TW201420052A - Induction-heating cooker - Google Patents

Abstract

To obtain an induction-heating cooker capable of efficiently negating magnetic flux leakage produced by a heating coil, and minimizing power loss caused by the magnetic-flux-leakage suppression means itself, an induction-heating cooker (100) is equipped with: a rice-cooker body (1); a heating coil (2) for generating a high-frequency magnetic field and induction-heating the rice-cooker body (1), and positioned on the outside of the rice-cooker body (1); a drive unit (3) for supplying a high-frequency current to the heating coil (2); and a magnetic-flux-leakage suppression means (8) configured from a conductive body for forming a closed loop by electrically shorting both ends, and positioned on the outside of the heating coil (2) when viewed from the rice-cooker body (1), wherein the conductive body is wound around a plurality of times, and at least a portion of the conductive body in the direction in which the conductive body and the heating coil (2) face one another is positioned in a location overlapping at least part of the heating coil (2).

Description

Induction heating conditioner

The invention relates to an induction heating conditioner.

In the conventional induction heating conditioner, as a means for suppressing leakage of magnetic leakage from the heating coil to the outside of the induction heating conditioner, a non-magnetic metal such as a plate-shaped aluminum is used as an electromagnetic separator, and is provided around the heating coil. . Such an induction heating conditioner generates an induced current by the magnetic flux leaked from the heating coil, and the magnetic flux generated by the induced current cancels the magnetic flux leakage from the heating coil (for example, refer to Patent Document 1).

[Prior patent documents] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. Sho 58-37676 (Page 1, Figure 1)

However, in the conventional induction heating conditioner, the electromagnetic isolation material provided around the heating coil generates an induced current to cancel the leakage magnetic flux from the heating coil, but the electromagnetic isolation material generates heat due to the induced current and the resistance of the electromagnetic separator. A power loss has occurred. Moreover, due to the magnetic flux leakage from the heating coil, not only the electromagnetic spacer but also the inside of the housing provided in the induction heating conditioner The metal element generates an induced current in the same manner, and the metal element other than the magnetic flux leakage spacer also suffers from heat generation. Therefore, not only does the power consumption of the induction heating conditioner rise, but the temperature inside the casing of the induction heating conditioner may also rise. When the temperature inside the casing rises, it is necessary to increase the cooling performance by cooling means inside the casing, and the supply power to the cooling means is increased, and the noise caused by the operation of the cooling means is also increased.

The present invention has been developed in order to solve the problems as described above, and provides an induction heating conditioner which can cancel magnetic flux leakage occurring from a heating coil with high efficiency and suppress the magnetic flux leakage suppressing means itself. Power loss.

The induction heating conditioner of the present invention comprises: a conditioning container; a heating coil disposed on an outer side of the conditioning container and generating a high frequency magnetic field to inductively heat the conditioning container; and a driving portion for supplying a high frequency current to the The heating coil and the magnetic flux leakage suppressing means are disposed on the outer side of the heating coil when viewed from the conditioning container, and are electrically short-circuited at both ends to form a closed loop conductor; the guiding system is wound The plurality of turns are arranged in a direction opposite to the heating coil, and at least a portion of the conductor is disposed at a position overlapping at least a portion of the heating coil.

The induction heating conditioner of the present invention has a magnetic flux leakage suppressing means which is disposed outside the heating coil when viewed from the conditioning container, and is electrically wound by a plurality of turns and which are electrically short-circuited at both ends Composition. Moreover, at least a part of the conductor constituting the magnetic flux leakage suppressing means is attached to the conductor and the heating wire The opposing direction of the ring is disposed at a position overlapping at least a portion of the heating coil. Therefore, by adjusting the number of turns of the wires constituting the magnetic flux leakage suppressing means, the induced current flowing to the wires can be made small, and the power loss occurring in the wires can be suppressed, and the magnetic flux leakage from the heating coil can be efficiently cancelled.

1‧‧‧cooking pot

2‧‧‧heating coil

3‧‧‧ Drive Department

4‧‧‧Display operation department

5‧‧‧Control Department

6‧‧‧Power Supply Department

7‧‧‧Reel

8‧‧‧Magnetic magnetic leakage suppression

9‧‧‧ ferrite core

10‧‧‧Magnetic magnetic flux suppression

10A‧‧‧Magnetic magnetic leakage suppression

11‧‧‧ pattern wiring

12a‧‧‧Outside of the coil

12b‧‧‧Inside of the coil

13‧‧‧Printed substrate

100‧‧‧Induction heating conditioner

100A‧‧‧Induction Heating Conditioner

Fig. 1 is a schematic configuration diagram of an induction heating conditioner according to a first embodiment.

Fig. 2 is a schematic side cross-sectional view showing the positional relationship between the rice cooker, the heating coil, and the magnetic flux leakage suppressing means of the induction heating conditioner of the first embodiment.

Figure 3 is a graph showing the relationship between the amperage of the wire and the leakage flux generated from the induction heating conditioner.

Fig. 4 is a view showing a modification of the magnetic flux leakage suppressing means of the induction heating conditioner of the first embodiment.

Fig. 5 is a view showing a modification of the magnetic flux leakage suppressing means of the induction heating conditioner according to the first embodiment.

Fig. 6 is a schematic configuration diagram of an induction heating conditioner according to a second embodiment.

Fig. 7 is a plan view and a side view showing a positional relationship between a second magnetic flux leakage suppressing means and a reel of the induction heating conditioner according to the second embodiment.

Fig. 8 is a view showing a modification of the second magnetic flux leakage suppressing means of the induction heating conditioner of the second embodiment.

Fig. 9 is a view showing the configuration of a second magnetic flux leakage suppressing means of the induction heating conditioner of the third embodiment.

Hereinafter, the induction heating conditioner of the present invention will be described with reference to the drawings. The embodiment. Further, the present invention is not limited to the form of the drawings shown below.

First embodiment

Fig. 1 is a schematic configuration diagram of an induction heating conditioner according to a first embodiment. The induction heating conditioner 100 described in the first embodiment is an induction heating type rice cooker, and includes a rice cooking pot 1, a heating coil 2, a driving unit 3, a display operation unit 4, and a control unit 5 which are conditioning containers. The power supply unit 6, the reel 7, and the magnetic flux leakage suppressing means 8. Each member shown in Fig. 1 is housed in the casing of the induction heating conditioner 100.

As shown in Fig. 1, the heating coil 2 for inductively heating the rice cooker 1 is disposed on the outer peripheral side of the bottom surface and the lower side surface of the rice cooker 1. The heating coil 2 supplies high frequency electric power from the drive unit 3 constituting the inverter circuit, and inductively heats the rice cooker 1. The display operation unit 4 includes an operation unit that accepts a setting of a rice cooking instruction or a rice cooking condition from the user, and a display unit that displays an operation state or a message to the user. The display operation unit 4 outputs a signal based on the setting from the user to the control unit 5, and the control unit 5 having a microcomputer or a control circuit drives and controls the drive unit 3 in accordance with a predetermined control sequence based on a signal from the display operation unit 4. The power supply unit 6 generates power for driving the display operation unit 4 and the control unit 5 from the commercial AC power supply.

A reel 7 for accommodating a power cord connected to a commercial AC power source is provided on the lower side of the heating coil 2. The casing of the reel 7 is made of sheet metal (iron or the like). The reel 7 is located on the opposite side of the rice cooking pot 1 via the heating coil 2 (the lower side of the heating coil 2 in the example of Fig. 1).

Further, although not specifically illustrated, the induction heating conditioner 100 has a cooling air supplied to cool the components in the casing of the induction heating conditioner 100. Air supply unit. The air blowing device is, for example, an axial flow fan, and is configured to supply cooling air to a member such as an electronic component provided in the heating coil 2 or the driving unit 3, and the temperature rises due to the operation.

Further, the induction heating conditioner 100 is provided with a magnetic flux leakage suppressing means 8 formed by winding a plurality of turns of a wire (winding wire) in a coil shape so as to surround the rice cooker 1 and the heating coil 2. The magnetic flux leakage suppressing means 8 is disposed outside the heating coil 2 so as to be spaced apart from the heating coil 2 when viewed from the rice cooking pot 1 of the object to be heated. In other words, the magnetic flux leakage suppressing means 8 is disposed at a position spaced apart from the heating coil 2. Further, the heating coil 2 is not in contact with the wire forming the magnetic flux leakage suppressing means 8, and there is a gap therebetween. Both ends of the wire constituting the magnetic flux leakage suppressing means 8 are short-circuited, and a closed circuit is electrically formed. A wire-shaped conductor material such as a copper wire or an aluminum wire can be used as the wire of the magnetic flux leakage suppressing means 8. Alternatively, a plate-shaped conductor material such as an aluminum plate may be wound into a coil shape to be used as the magnetic flux leakage suppressing means 8. Further, the lead wires constituting the magnetic flux leakage suppressing means 8 are subjected to insulation treatment by coating or the like, and are not electrically connected even if they are in contact with each other. In the case where the wires are not insulated, the wires are taken at a sufficient distance from each other to avoid contact with each other.

Fig. 2 is a schematic side cross-sectional view showing the positional relationship between the rice cooker, the heating coil, and the magnetic flux leakage suppressing means of the induction heating conditioner of the first embodiment. As shown in Fig. 2, the magnetic flux leakage suppressing means 8 is provided at a position facing the rice cooker 1 around the heating coil 2, and as shown by a broken line in Fig. 2, the wire constituting the magnetic flux leakage suppressing means 8 At least a portion of the portion is configured to overlap in a direction opposite to at least a portion of the heating coil 2. Further, in the first embodiment, the lower end of the wire of the magnetic flux leakage suppressing means 8 is located lower than the upper end of the heating coil 2. The side is higher than the lower end of the heating coil 2, and the side view heating coil 2 overlaps with the wire constituting the magnetic flux leakage suppressing means 8 in the height direction.

Moreover, as shown in FIG. 2, the ferrite core 9 is provided in the vicinity of the lower side of the heating coil 2.

The configuration of the induction heating conditioner 100 of the first embodiment has been described above. Next, the operation of the induction heating conditioner 100 of the first embodiment will be described.

When the user instructs the display operation unit 4 to start heating for a rice cooking instruction or the like, the control unit 5 starts controlling the drive unit 3. The drive unit 3 is constituted by a frequency converter circuit and supplies a high-frequency current to the heating coil 2. When a high-frequency current flows to the heating coil 2, an alternating magnetic field is generated from the heating coil 2, whereby the magnetic flux is supplied to the rice cooking pot 1 which is an object to be heated. When the magnetic flux is supplied, an eddy current is generated in the rice cooking pot 1, and Joule heat occurs due to the eddy current and the electric resistance of the rice cooking pot 1, and the rice cooking pot 1 is heated.

In this manner, when the high-frequency current is supplied to the heating coil 2, the magnetic flux is generated from the heating coil 2, and the rice cooking pot 1 is heated. However, not all the magnetic flux generated from the heating coil 2 is used for induction heating of the rice cooking pot 1, and a part of the magnetic flux generated from the heating coil 2 does not contribute to the heating of the rice cooking pot 1, and becomes a so-called leak. Magnetic, is radiated to the surroundings. This magnetic flux leakage system is interlinked with the magnetic flux leakage suppression means 8 forming a coil shape. In other words, the magnetic flux leakage suppressing means 8 is disposed to be interlinked with the magnetic flux generated from the heating coil 2. When the magnetic flux leakage and the magnetic flux leakage suppressing means 8 are interlinked, the electric flux forming the magnetic flux leakage suppressing means 8 generates an electromotive force in the direction of canceling the magnetic flux leakage, and the induced current flows. Since the induced current generated by the magnetic flux leakage suppressing means 8 in this way cancels a part of the magnetic flux leakage generated from the heating coil 2, it leaks to The magnetic flux outside the basket of the induction heating conditioner 100 is reduced.

The magnetic flux leakage canceling effect of the magnetic flux leakage suppressing means 8 is such that the stronger the magnetic field generated by the magnetic flux leakage suppressing means 8, the greater the effect. The magnetic field generated by the magnetic flux leakage suppressing means 8 is proportional to the current flowing through the wire constituting the magnetic flux leakage suppressing means 8 and the number of turns of the wire. Therefore, the larger the current flowing to the wire, or the more the number of turns of the wire, the greater the effect of magnetic flux leakage suppression. Figure 3 is a graph showing the relationship between the ampere-turn of the wire (the product of the current flowing to the wire and the number of turns) and the leakage flux generated by the induction heating conditioner. As shown in Fig. 3, it is known that the larger the amperage, the greater the effect of magnetic flux leakage suppression.

Here, the power loss P generated by the magnetic flux leakage suppressing means 8 can be obtained from the current I flowing to the wire and the resistance R of the wire by P = I ² ‧ R. In this way, since the power loss is proportional to the square of the current, it is effective to reduce the current loss in reducing the power loss of the magnetic flux leakage suppressing means 8. Further, by increasing the number of turns of the wire in proportion to the amount by which the current is reduced, the amperage is maintained, and the magnetic flux leakage suppressing effect is maintained.

By the way, as a magnetic flux leakage suppressing means, a non-magnetic metal such as a plate-shaped aluminum is formed in a ring shape and placed around the heating coil. However, the number of turns is equivalent to one turn. Therefore, in order to obtain the magnetic flux leakage suppressing effect, a large current must flow to the aluminum plate, resulting in a large loss.

In the first embodiment, since the wire is wound around the plurality of turns as the magnetic flux leakage suppressing means 8 and disposed around the heating coil 2, the current flowing to the wire is reduced, and the number of turns of the wire is ensured. The magnetic flux leakage suppression effect is reduced, and the power loss occurring in the magnetic flux leakage suppression means 8 can be reduced. Therefore, the power consumption of the induction heating conditioner 100 can be reduced, and the heating effect can be improved.

In addition, the current flowing to the wire is dependent on the resistance of the wire. If the resistance value of the wire becomes large, the induced current flowing to the wire decreases, and if the resistance value of the wire becomes small, the induced current flowing to the wire increases. The resistance value of the wire is proportional to the length of the wire and inversely proportional to the cross-sectional area of the wire. Therefore, if the number of turns of the wire is increased, the resistance value increases, and the induced current flowing to the wire decreases. Therefore, in order to appropriately set the ampoule of the magnetic flux leakage suppressing means 8, the number of turns of the wire and the cross-sectional area (wire diameter) are set to appropriate values, thereby adjusting the induced current flowing to the wire.

The lead wire constituting the magnetic flux leakage suppressing means 8 is provided on the outer peripheral portion of the heating coil 2 as shown in Fig. 2, and at least a part of the wires constituting the magnetic flux leakage suppressing means 8 and at least a part of the heating coil 2 are arranged to be in the wire and heated. The opposite directions of the coils 2 overlap. Since the heating coil 2 and at least a part of the wires constituting the magnetic flux leakage suppressing means 8 overlap in the opposing direction of the two, the distance between the heating coil 2 and the wires constituting the magnetic flux leakage suppressing means 8 can be shortened and heated. The magnetic flux leakage generated by the coil 2 is efficiently interlinked with the magnetic flux leakage suppressing means 8. Thereby, the magnetic flux leakage suppression effect can be improved.

Fig. 4 is a view showing a modification of the magnetic flux leakage suppressing means of the induction heating conditioner according to the first embodiment, and is a schematic side cross-sectional view showing the positional relationship between the rice cooking pot 1, the heating coil 2, and the magnetic flux leakage suppressing means 8. In the example shown in Fig. 4, the number of turns of the wire of the magnetic flux leakage suppressing means 8 is larger than that shown in Fig. 2. As shown in FIG. 4, in the case where the number of turns of the magnetic flux leakage suppressing means 8 is increased, the wire may be wound in the radial direction so as to suppress the size of the entire magnetic flux leakage suppressing means 8 in the height direction. By winding the wire in a plurality of layers in this manner, it is possible to reduce the size of the magnetic flux leakage suppressing means 8 in the height direction, and to increase the number of turns, and to arrange it in a limited space in the casing of the induction heating conditioner 100. The magnetic flux leakage suppressing means 8 is set to the desired amperage. In addition, in Figure 4, an example table It is shown that the wire is wound into two layers, but for example, the wire may be wound into three or more layers.

Fig. 5 is a view for explaining a modification of the magnetic flux leakage suppressing means of the first embodiment. A schematic side cross-sectional view showing the positional relationship between the rice cooking pot, the heating coil, and the magnetic flux leakage suppressing means. In the example shown in Fig. 5, the wires constituting the magnetic flux leakage suppressing means 8 are arranged along the outer surface of the heating coil 2 (the surface of the heating coil 2 facing the magnetic flux leakage suppressing means 8). The heating coil 2 is disposed on the outer side of the rounded outer wall of the side surface and the bottom surface of the rice cooker 1 along the rounded outer wall of the rice cooker 1, so that it is disposed along the outer surface of the heating coil 2 The wire constituting the magnetic flux leakage suppressing means 8 is disposed along the rounded outer wall near the bottom of the rice cooker 1 to form a wire constituting the magnetic flux leakage suppressing means 8.

In this manner, by arranging the wires constituting the magnetic flux leakage suppressing means 8 along the outer shape (outer shape) of the heating coil 2 opposite to the magnetic flux leakage suppressing means 8, the wire and the heating can be uniformly maintained without local separation. The distance of the coil 2. Therefore, it is possible to prevent a decrease in the magnetic flux leakage suppressing effect caused by the distance between the wire and the heating coil 2 being partially distant. Further, in the case where the number of turns of the magnetic flux leakage suppressing means 8 is increased as shown in the example of Fig. 4, the wire can be wound in a plurality of layers along the outer shape of the heating coil 2 as in the example of Fig. 5.

As described above, in the first embodiment, the magnetic flux leakage suppressing means 8 is configured such that the wire is wound around the outer circumferential side of the heating coil 2 and the both ends of the wire are electrically short-circuited. Therefore, even if the induced current flowing to the wire is reduced, since the wire can be wound a plurality of turns to maintain the amperage, the magnetic flux leakage suppressing effect can be maintained, and the power loss occurring in the magnetic flux leakage suppressing means 8 can be reduced. Since the power loss occurring in the magnetic flux leakage suppressing means 8 can be reduced in this way, the power consumption of the induction heating conditioner 100 can be reduced, and the heating efficiency can be improved. Again, because it can be reduced Since the power loss occurring in the magnetic flux leakage suppressing means 8 is small, the temperature rise inside the casing of the induction heating conditioner 100 is also suppressed, and the performance of the cooling means for cooling the casing can be suppressed from increasing. Therefore, it is possible to reduce the power consumption required for the operation of the cooling means and the noise accompanying the operation of the cooling means.

Further, in the first embodiment, at least a part of the lead wire of the magnetic flux leakage suppressing means 8 is disposed so as to overlap with at least a part of the heating coil 2 in a direction facing the heating coil 2, so that leakage from the heating coil 2 occurs. The magnetic flux is efficiently interlinked with the magnetic flux leakage suppressing means 8, and the magnetic flux leakage suppressing effect of suppressing leakage of the magnetic flux to the outside of the casing of the induction heating conditioner 100 can be improved.

In the first embodiment, the lead wire constituting the magnetic flux leakage suppressing means 8 is wound around the outer circumference of the heating coil 2 in a circular (annular) manner. However, the shape of the wound wire is not limited to a circular shape. For example, the wire may be wound into a quadrangular shape in accordance with the shape of the induction heating conditioner 100.

Second embodiment

In the above-described first embodiment, the magnetic flux leakage suppressing means 8 provided on the outer peripheral side of the heating coil 2 is formed by winding a plurality of turns of a wire and electrically short-circuiting both ends of the lead wire, thereby efficiently performing the magnetic flux leakage suppressing means 8 A method of reducing leakage from the induction heating conditioner 100 to the outside. In the second embodiment, the metal element disposed inside the induction heating conditioner 100 is inductively heated in order to efficiently suppress the magnetic flux leakage from the heating coil 2, and magnetic leakage is provided in addition to the magnetic flux leakage suppressing means 8. An example of the suppression means (the magnetic flux leakage suppression means 10 of the second embodiment). In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the differences from the first embodiment will be mainly described.

Fig. 6 is a schematic configuration diagram of an induction heating conditioner according to a second embodiment. The layer between the heating coil 2 and the reel 7 which is different from the first figure shown in the first embodiment has the second magnetic flux leakage suppressing means 10. The second magnetic flux leakage suppressing means 10 is a coil formed by winding a wire in a plurality of turns in a disk shape, and both ends of the wire are short-circuited to form a closed circuit electrically. The second magnetic flux leakage suppressing means 10 is located on the lower side of the heating coil 2 and on the upper side of the reel 7. In other words, the second magnetic flux leakage suppressing means 10 is disposed on the front surface of the reel 7 when viewed from the heating coil 2.

Fig. 7 is a plan view and a side view showing a positional relationship between a second magnetic flux leakage suppressing means and a reel of the induction heating conditioner according to the second embodiment. The figure on the upper side of Fig. 7 is a plan view, and the lower side is a side view. As shown in Fig. 7, the second magnetic flux leakage suppressing means 10 is provided on the upper side of the reel 7, and is disposed so as to cover the entire casing of the reel 7, or a part of the casing. In other words, at least a part of the second magnetic flux leakage suppressing means 10 is disposed so as to overlap at least a part of the reel 7 in a direction facing the reel 7. Further, the upper surface of the reel 7 is not in contact with the second magnetic flux leakage suppressing means 10, and a gap is provided therebetween. The wire constituting the second magnetic flux leakage suppressing means 10 is, for example, a copper wire or an aluminum wire insulated by coating or the like. Further, when the wires are not insulated, a gap is formed between the wires so as not to be in contact with each other.

The configuration of the induction heating conditioner 100A of the second embodiment has been described above. Next, the operation of the induction heating conditioner 100A will be described. In addition, since the effects of the heating operation and the magnetic flux leakage suppressing means 8 of the induction heating conditioner 100A of the second embodiment are the same as those of the first embodiment, the operation of the second magnetic flux leakage suppressing means 10 will be mainly described. And role.

The start of cooking instruction by the user to the display operation unit 4 When the indication of heating is performed, the high-frequency current is supplied to the heating coil 2, and the rice cooking pot 1 is heated. At this time, a part of the magnetic flux leakage which does not contribute to the heating of the rice cooking pot 1 is interlinked with the second magnetic flux leakage suppressing means 10. Then, in the second magnetic flux leakage suppressing means 10, an electromotive force is generated in a direction to cancel the change in the magnetic flux, and an induced current flows. In this way, the induced current generated by the second magnetic flux leakage suppressing means 10 cancels a part of the magnetic flux leakage generated from the heating coil 2, so that the induced current generated in the casing of the reel 7 can be reduced. The temperature rise of the reel 7 is suppressed.

The basket system of the reel 7 has a low-cost iron alloy material because of its low cost, but since the iron is a magnetic material, the magnetic flux is easily passed, and it has a property of being easily heated by induction. When the reeling tray 7 has to be placed in the vicinity of the heating coil 2 in the limited space of the casing of the induction heating conditioner 100A, the casing itself of the reeling tray 7 is inductively heated, and wasted power loss. This leads to a reduction in the heating efficiency of the conventional induction heating conditioner. However, in the second embodiment, since the second magnetic flux leakage suppressing means 10 is provided, since the induced current flowing to the casing of the reel 7 can be reduced, even if the casing of the reel 7 is used, the magnetic flux is easy to be used. In the case of the material passed, the power loss occurring in the reel 7 can also be suppressed.

Further, as described in the first embodiment, it can be said that the magnetic flux canceling effect is stronger as the magnetic field generated by the second magnetic flux leakage suppressing means 10, that is, the larger the ampere of the wire, the greater the effect. More specifically, the larger the current flowing to the wires constituting the second magnetic flux leakage suppressing means 10, or the larger the number of turns of the wires, the larger the magnetic flux leakage suppressing effect.

Further, similarly to the description of the magnetic flux leakage suppressing means 8 in the first embodiment, the power loss P generated in the second magnetic flux leakage suppressing means 10 is transmitted to the first Since the square of the current of the magnetic flux leakage suppressing means 10 is proportional, it is effective to reduce the loss of the second magnetic flux leakage suppressing means 10 and to reduce the current flowing to the wire. Further, by increasing the number of turns of the wire in proportion to the amount of current reduction and increasing the amperage, the effect of suppressing the magnetic flux leakage can be maintained.

Therefore, in the second embodiment, the second magnetic flux leakage suppressing means 10 is configured such that the wire is wound in a plurality of turns in a circular shape. By winding the wire in a plurality of turns in this manner, the current flowing to the wire becomes small, and the ampere can be ensured, and the heat rise of the second magnetic flux leakage suppressing means 10 can be suppressed while suppressing the temperature rise of the casing of the reeling plate 7. . Therefore, the power consumption of the induction heating conditioner 100A can be reduced, and the heating efficiency can be improved.

In addition, since the induced current flowing to the second magnetic flux leakage suppressing means 10 is dependent on the resistance value of the wire, as described in the first embodiment, the number of turns and the cross-sectional area (wire diameter) of the wire are adjusted to adjust the flow to The induced current of the wire of the second magnetic flux leakage suppressing means 10.

FIG. 8 is a view showing a modification of the second magnetic flux leakage suppressing means of the induction heating conditioner according to the second embodiment, and shows a rice cooking pot 1, a heating coil 2, a magnetic flux leakage suppressing means 8, and a second magnetic flux leakage suppressing means. A schematic side cross-sectional view of the positional relationship of 10. As shown in Fig. 8, the wire can be wound so as to overlap the plurality of layers in the height direction in accordance with the number of turns of the wire of the second magnetic flux leakage suppressing means 10. According to this configuration, even when the space in the plane direction is small, the number of turns of the wire can be efficiently increased, and the required ampere can be ensured. Further, in Fig. 8, the wire is wound into two layers, but the wire may be provided in such a manner that a plurality of layers are overlapped, for example, three or more layers are formed.

Also, as shown by the dotted line in Fig. 8, in the side view, the second leak At least a part of the magnetic suppression means 10 and the heating coil 2 are disposed at positions overlapping each other in the opposing direction. That is, in the example of Fig. 8, at least a part of the heating coil 2 overlaps at least a part of the second magnetic flux leakage suppressing means 10 when viewed from above. Therefore, the distance between the heating coil 2 and the wire constituting the second magnetic flux leakage suppressing means 10 can be set as short as possible, and the magnetic flux leakage generated in the heating coil 2 can be efficiently interlinked with the second magnetic flux leakage suppressing means 10. Therefore, the magnetic flux leakage suppressing effect of suppressing leakage magnetic leakage from the heating coil 2 to the outside of the induction heating conditioner 100A can be improved.

As described above, in the second embodiment, the heating coil 2 and the reel 7 are provided in such a manner that a wire is wound in a plurality of turns to form a disk shape, and both ends of the wire are electrically short-circuited. The second magnetic flux leakage suppressing means 10 is configured. Therefore, the second magnetic flux leakage suppression means 10 cancels a part of the magnetic flux leakage generated from the heating coil 2, and the induced current generated in the casing of the reel 7 can be reduced. Thereby, the temperature rise of the casing of the reel 7 can be prevented. In addition, the second magnetic flux leakage suppressing means 10 is suppressed by the second magnetic flux leakage suppressing means 10 by suppressing the heat generation of the second magnetic flux leakage suppressing means 10 by securing the number of turns of the lead wire of the second magnetic flux leakage suppressing means 10 and causing the current to flow to the lead wire. The power loss that occurs can reduce the power consumption of the induction heating conditioner 100, and can improve the heating efficiency. Further, since the temperature rise of the second magnetic flux leakage suppressing means 10 and the reel 7 can be suppressed, the temperature rise inside the casing of the induction heating conditioner 100A can be suppressed, and the inside of the casing for cooling the induction heating conditioner 100A can be used. The cooling performance of the cooling means is reduced, and the power consumption of the cooling means and the noise accompanying the operation of the cooling means can be reduced.

Third embodiment

In the second embodiment described above, it is shown that it is wound into a disk shape. The wire constitutes an example of the second magnetic flux leakage suppressing means 10. In the third embodiment, another configuration example of the second magnetic flux leakage suppressing means 10 will be described. Further, in the third embodiment, differences from the second embodiment will be mainly described.

Fig. 9 is a view showing the configuration of a second magnetic flux leakage suppressing means of the induction heating conditioner of the third embodiment. The figure on the upper side of Fig. 9 is a plan view, and the lower side is a side view.

As shown in FIG. 9, the second magnetic flux leakage suppressing means 10A is formed by forming the coil on the printed circuit board 13 by the pattern wiring 11. The printed circuit board 13 is a printed circuit board having a glass epoxy resin substrate or the like as a base material, and the second magnetic flux leakage suppressing means 10A is configured by forming the pattern wiring 11 on the printed circuit board 13 by copper foil or the like. The pattern wiring 11 constituting the second magnetic flux leakage suppressing means 10A has a coil portion that is formed in a spiral shape. In the example of Fig. 9, the coil portion forming coil wiring of the pattern wiring 11 is formed from the coil outer end portion 12a located on the outer circumference of the printed circuit board 13, and the pattern inner wiring portion 11b is formed in a spiral shape by the coil inner end portion 12b. Electrical connection is made to the back surface of the printed substrate 13 via the through holes. Further, although not shown, the pattern wiring 11 is formed in a spiral shape from the inner side of the back surface of the printed substrate 13 to the outer side of the substrate back surface in the same direction as the winding direction of the surface. Further, the end portion of the coil on the back side is electrically connected to the coil outer end portion 12a of the surface of the substrate via the through hole. That is, the starting point and the end point of the coil formed by the pattern wiring 11 are electrically connected to form a closed loop.

The printed circuit board 13 constituting the second magnetic flux leakage suppressing means 10A is disposed between the heating coil 2 and a metal element (for example, the reel 7) constituting one of the induction heating conditioners 100A. In other words, the heating element 2 and the metal element such as the reel 7 are disposed so as to face each other via the second magnetic flux leakage suppressing means 10A. member. In the third embodiment, the second magnetic flux leakage suppressing means 10A is formed by the printed circuit board 13 and the pattern wiring 11 formed on the printed circuit board 13. Therefore, the thickness of the second magnetic flux leakage suppressing means 10A can be made thinner than that of the printed circuit board 13. The thickness is approximately the same. Therefore, the second magnetic flux leakage suppressing means 10A may be provided when the installation space is narrow when the lower portion of the heating coil 2 is disposed. Thereby, the size and thickness of the induction heating conditioner 100A can be reduced.

In the second embodiment, the substrate of the printed circuit board 13 is exemplified as a glass epoxy resin substrate. However, the substrate of the printed circuit board 13 is not limited thereto, and the pattern constituting the second magnetic flux leakage suppressing means 10A is applied. For example, the coil diameter, the pattern width, and the number of turns of the wiring 11 may be such that the pattern wiring 11 may be wired to the paper phenol substrate on one side, or the multilayer pattern wiring 11 may be provided on the multilayer substrate.

As described above, in the third embodiment, the second magnetic flux leakage suppressing means 10A including the coil formed on the printed circuit board 13 by the pattern wiring 11 is provided in the direction in which the heating coil 2 and the reel 7 are opposed to each other. Therefore, the second magnetic flux leakage suppressing means 10A cancels a part of the magnetic flux leakage generated from the heating coil 2, and the induced current generated in the casing of the reel 7 can be reduced. Thereby, the temperature rise of the casing of the reel 7 can be prevented.

Further, in the third embodiment, since the second magnetic flux leakage suppressing means 10A is formed by applying the pattern wiring 11 to the printed circuit board 13, the second magnetic flux leakage suppressing means 10A can be made thinner to the thickness of the printed circuit board 13, and The induction heating conditioner 100A is reduced in size and thickness.

Further, in the second and third embodiments, the arrangement example of the second magnetic flux leakage suppressing means 10, 10A for suppressing the induced current flowing to the reel 7, is shown. However, the object of electromagnetic isolation by the second magnetic flux leakage suppressing means 10, 10A is not limited to the reel 7, and other metal components in the casing of the induction heating conditioner 100A can be emulated by the example of the reel 7, as well. The same effect is obtained by arranging the second magnetic flux leakage suppressing means 10, 10A.

Further, in the second and third embodiments, the second magnetic flux leakage suppressing means 10 and 10A are disposed between the metal element (the reel 7) provided on the lower side of the heating coil 2, but the metal element is provided. The arrangement of the second magnetic flux leakage suppressing means 10, 10A is not limited to this. For example, in the case of the induction heating conditioner 100A in which the metal element is disposed on the side surface of the heating coil 2, the second magnetic flux leakage suppressing means 10, 10A may be disposed on the side of the heating coil 2 and located between the heating coil 2 and the metal element. In this manner, by arranging the second magnetic flux leakage suppressing means 10, 10A between the heating coil 2 and the metal member, the second magnetic flux leakage suppressing means 10, 10A can cancel the occurrence of the side of the heating coil 2. A part of the magnetic flux leakage suppresses the temperature rise of the metal component and reduces power loss.

In the second embodiment, the wire constituting the second magnetic flux leakage suppressing means 10 is wound into a circular shape (annular shape). However, the shape of the winding wire is not limited to a circular shape. For example, the wire may be rolled. Wrapped into a quadrangular shape.

In the third embodiment, the pattern wiring 11 constituting the second magnetic flux leakage suppressing means 10A is circular. However, the shape of the pattern wiring 11 is not limited to a circular shape. For example, the pattern wiring 11 may be formed in a quadrangular shape.

Further, the first, second, and third embodiments can be combined with each other, and in the case of the above, the effects described in the respective embodiments can be obtained.

Further, the magnetic flux leakage suppressing means 8 shown in the first embodiment may be omitted, and the second magnetic flux leakage suppressing means 10 and 10A shown in the second and third embodiments may be provided. Placed in an induction heating conditioner.

Further, in the above-described first to third embodiments, the present invention is applied to an example of a rice cooker. However, if it is an induction heating conditioner including a conditioning container and a heating coil for inductively heating the conditioning container, The invention is applied to, for example, an electric kettle or a kettle.

100‧‧‧Induction heating conditioner

1‧‧‧cooking pot

4‧‧‧Display operation department

5‧‧‧Control Department

2‧‧‧heating coil

3‧‧‧ Drive Department

6‧‧‧Power Supply Department

7‧‧‧Reel

8‧‧‧Magnetic magnetic leakage suppression

Claims (5)

An induction heating conditioner includes: a conditioning container; a heating coil disposed on an outer side of the conditioning container and generating a high frequency magnetic field to inductively heat the conditioning container; and a driving portion for supplying a high frequency current to the heating The coil and the magnetic flux leakage suppressing means are disposed on the outer side of the heating coil when viewed from the conditioning container, and are electrically short-circuited at both ends to form a closed loop conductor; wherein the guiding system is The plurality of turns are wound in a plurality of turns; at least a portion of the conductor is disposed at a position overlapping at least a portion of the heating coil in a direction in which the conductor and the heating coil face each other. The induction heating conditioner according to claim 1, wherein at least a part of the conductor constituting the magnetic flux leakage suppressing means is disposed to be evenly spaced apart from the heating coil along the heating coil. The induction heating conditioner according to claim 1, wherein the metal element is disposed on a side opposite to the conditioning container via the heating coil; and the magnetic flux leakage suppressing means is disposed on the metal element when viewed from the heating coil Further, at least a part of the conductor constituting the magnetic flux leakage suppressing means is disposed at a position overlapping with at least a part of the metal element in a direction in which the metal element faces. An induction heating conditioner according to claim 3, wherein the guide system constituting the magnetic flux leakage suppressing means is formed on the printed circuit board by pattern wiring. The induction heating conditioner according to any one of claims 1 to 4, wherein at least a part of the conductor constituting the magnetic flux leakage suppressing means is wound in a manner of overlapping a plurality of layers.