JP5047379B1 - Induction heating cooker - Google Patents

Abstract

An induction heating cooker capable of reducing the size of a holding member is obtained.
A top plate on which an object to be heated is placed, a heating port formed on the top plate and indicating a placement position of the object to be heated, and a lower plate disposed below the top plate. A plurality of heating coils 2 provided for one heating port 12, a coil base 6 for holding a plurality of heating coils 2 provided for one heating port 12, and a coil base 6 provided below the coil base 6, Supporting means 7 for supporting the base 6, and the supporting means 7 is disposed between the adjacent heating coils 2 in plan view.
[Selection] Figure 2

Description

  The present invention relates to an induction heating cooker having a plurality of heating coils.

  In the prior art, for example, “a top plate on which an object to be heated is placed, a plurality of induction heating coils provided below the top plate and having different center positions in plan view, and the induction heating coil A blower for supplying cooling air to be cooled, a plurality of coil holding members for holding each of the plurality of induction heating coils, and a support means for supporting the coil holding members, wherein the plurality of coil holding members are: An induction heating cooker that is formed integrally or fixed to each other to form a single coil holder "has been proposed (for example, see Patent Document 1).

JP 2010-272459 A (Claim 1)

In a conventional induction heating cooker, generally, a plurality of heating coils having substantially the same diameter are used, and these heating coils are installed below a top plate which is an upper surface of a casing inside. When the heating coils are installed, each heating coil is held by a holding member (coil base) that holds the heating coil, and is pressed against the back surface of the top plate by a supporting means that supports the holding member. It has become. As a configuration of a heating port of a general induction heating cooker, a heating circuit corresponding to one heating port and a corresponding driving circuit are provided, and one holding member is provided for each heating coil that can be individually driven. It was a thing.
Therefore, it is necessary to provide as many holding members as the number of heating coils that can be individually driven. For this reason, the mounting area for the holding member in the housing is increased, and a large space for installing electronic components and air passages is reduced in the periphery, and the cost increases due to the increase in the number of electronic components, or the air passage area. Along with the decrease, the ventilation resistance increased, and the operating noise tended to increase due to the higher speed of the cooling fan.

  In order to cope with such a problem, in the induction heating cooker described in Patent Document 1, a plurality of holding members that respectively hold a plurality of heating coils are integrally formed or fixed to each other to be a single holding It constitutes a member. According to this, since the number of support means can be reduced, it is possible to suppress an increase in ventilation resistance and to reduce the number of parts and simplify the assembling work.

However, in the induction heating cooker described in Patent Document 1, when the number of heating coils held by the holding member is large, or when the size of the holding member is large, the support means is placed on the outer periphery away from the plurality of heating coils. Therefore, there is a problem that the space occupied by the holding member increases.
Further, since the space occupied by the holding member is increased, for example, when an electronic circuit is arranged below the holding member, the height is limited or the influence of induction heating is caused.

Further, since the holding member is supported by a small number of support means at a position away from the heating coil, there is a problem that the holding member is easily bent.
Furthermore, in order to secure strength, even if it is strengthened by inserting many ribs in the holding member, the cost increases due to an increase in the weight of the holding member, and the cooling capacity decreases due to the decrease in the exposed area for cooling the heating coil. In addition, there is a risk of increasing driving noise.

  In addition, when the support means is made of metal such as a compression spring, if the support means is provided below the heating coil, it is easy to be induction-heated, and peripheral components deteriorate due to higher temperature deformation than expected due to high temperature. There was a problem.

  Further, the support means is provided below the heating coil formed with a high density of copper wire or the like. For this reason, when installing the heating coil unit comprised from a heating coil and a holding member in a housing | casing, an assembly location will be located under the heating coil. Thereby, at the time of the assembly operation of the supported portion of the heating coil unit and the support means, there is a problem that it is difficult to confirm the assembly location from above the heating coil unit and the assemblability is poor. For this reason, it has not been very realistic as a configuration for integrally holding a plurality of heating coils.

The present invention has been made in order to solve the above-described problems, and provides an induction heating cooker in which a holding member can be made compact.
Moreover, the induction heating cooking appliance which can suppress the bending of a holding member is obtained.
Moreover, the induction heating cooking appliance which can improve assembly property is obtained.

An induction heating cooker according to the present invention includes a top plate on which an object to be heated is placed, a heating port formed on the top plate and indicating a placement position of the object to be heated, and a position below the top plate. A plurality of heating coils provided for one heating port, a holding member for integrally holding the plurality of heating coils provided for one heating port, and a lower portion of the holding member. Provided with a support means for supporting the holding member and a drive circuit for supplying a high-frequency current to the heating coil , wherein the support means includes a plurality of heating coils provided for one heating port. among them, a between the heating coil adjacent to each other in plan view, is disposed outside of the heating coil in a plan view, of the heating coil adjacent to each of the magnetic flux and the other arising from one heating coil A magnetic flux generated from the heat coil is one which is arranged at a position in the opposite direction in a plan view.

  In the present invention, since the support means is disposed between the adjacent heating coils in plan view, the holding member can be made compact. Further, the bending of the holding member can be suppressed. In addition, the assemblability can be improved.

1 is an overall perspective view of an induction heating cooker according to Embodiment 1. FIG. 2 is a configuration diagram of a heating coil unit according to Embodiment 1. FIG. It is a block block diagram of the induction heating cooking appliance which concerns on Embodiment 1. FIG. FIG. 4 is a diagram for explaining a heating drive operation according to the first embodiment. 6 is a top view showing another example of the heating coil unit according to Embodiment 1. FIG.

Embodiment 1 FIG.
(Constitution)
1 is an overall perspective view of an induction heating cooker according to Embodiment 1. FIG.
As shown in FIG. 1, the induction heating cooker 100 of this Embodiment is provided with the top plate 11 on the upper surface of the housing | casing 1, and can mount to-be-heated objects 10, such as a pan. A heating port 12 (12a, 12b, and 12c are collectively referred to as 12) is formed in the top plate 11, and shows a position where the article to be heated 10 is placed. Here, the heating ports 12 are arranged at two locations on the front left and right sides of the housing 1 and at one location in the center of the back of the housing 1.
In addition, a plurality of ventilation holes are formed at the rear of the top plate 11, and the cooling fan 14 (14a and 14b is collectively referred to as 14) has intake ports 15 (15a and 15b) that intake air from outside the housing 1. When collectively referred to as 15), the cooling air passes through the exhaust port 16 that exhausts the outside of the housing 1 after cooling the inside of the housing 1. Here, a case where a vent hole is formed behind the top plate 11 is shown as an example. However, the present invention is not limited to this. For example, the vent hole behind the top plate 11 is eliminated and the front surface and the rear surface of the housing 1 are formed. A vent hole may be formed on the surface. Moreover, although the cooling fan 14 has shown the case of the axial flow fan as an example, it is not limited to this.
An operation unit 5 is provided in front of the top plate 11 for receiving instructions from the user.

  A heating coil unit 13 is disposed inside the housing 1 and below the top plate 11. A grill 9 is disposed at the center bottom of the housing 1, a right control board 25a and a right cooling fan 14a are disposed on the right side of the housing across the grill 9, and above the right control board 25a. A right heating coil unit 13a is provided. Similarly, a left control board (not shown) and a left cooling fan 14b are disposed behind and symmetrical to the right side of the grill 9, and a left heating coil unit 13b is provided above the left control board. Yes.

  Each control board 25 includes an inverter 3 for supplying high frequency power to the heating coil 2, a control unit 8 for controlling a driving motor for driving the heating coil 2 and the cooling fan 14, and the top of the object to be heated 10 such as a pan. And a pan placement discriminating section 4 for detecting the placement state on the plate 11. The inverter 3 includes a circuit formed by a heat generating portion such as a switching element and one or more capacitors connected to the circuit.

The heating coil 2 on the heating coil unit 13 causes an eddy current to be generated in the object to be heated 10 placed above the heating coil 2 (described later) due to the lines of magnetic force generated by the current, and causes the object to be heated 10 to generate heat. It has become.
In the present embodiment, the heating coil unit 13 is arranged so that all the three heating ports 12 can be induction-heated. However, AC power of commercial frequency is supplied from the heating port 12 at the rear of the center and the heater itself. Other heating methods such as a radiant heater (not shown) that heats the object to be heated 10 by radiant heat by generating heat may be employed.

FIG. 2 is a configuration diagram of the heating coil unit according to the first embodiment.
As shown in FIG. 2, in the present embodiment, the first heating coil 2a capable of heating the object to be heated 10 alone and the object to be heated 10 can be heated together with or alone with the first heating coil 2a. A second heating coil 2b and a third heating coil 2c are provided.
The first heating coil 2a, the second heating coil 2b, and the third heating coil 2c generate a high-frequency magnetic field when supplied with a high-frequency current, and are heated on the top plate 11. The object to be heated 10 is heated by generating an eddy current in the object 10.
In FIG. 2, the second heating coil 2b formed in a substantially elliptical shape is arranged in two places around the first heating coil 2a formed in a substantially circular shape, and is formed in a substantially elliptical shape. An example in which the third heating coil 2c is arranged in two places will be described.
Further, the second heating coil 2b and the third heating coil 2c have substantially the same shape, and are arranged at four locations in the front-rear and left-right directions when viewed from above the housing (plan view). That is, the two second heating coils 2b are arranged opposite to each other in the left-right direction with the first heating coil 2a interposed therebetween, and the two third heating coils 2c are front and rear with the first heating coil 2a interposed therebetween. It is arrange | positioned facing the direction (depth direction).
Also, two of the second heating coil 2b and two of the third heating coil 2c are electrically connected in series, respectively, from inverters 3a, 3b and 3c (collectively referred to as inverter 3). The supplied high-frequency current is configured to flow.

The heating coil unit 13 includes a heating coil 2, a coil base 6, a ferrite 19, and a magnetic shield ring 17.
The coil base 6 integrally holds a plurality of heating coils 2 provided for one heating port 12. Specifically, the coil base 6 is formed in a circular shape, and includes a first heating coil 2a, and a second heating coil 2b and a third heating coil 2c that are separately arranged at four locations around the first heating coil 2a. keeping. Thus, the coil base 6 holds the five heating coils 2 that can be individually driven (there are actually three heating coils that can be individually driven).
The coil base 6 corresponds to the “holding means” in the present invention.

The magnetic shield 17 is provided on the outer periphery of the coil base 6 so as to surround each heating coil 2. The magnetic-shielding ring 17 surrounds the outer periphery of the heating coil 2 to suppress leakage of a high-frequency magnetic field that does not reach the object to be heated 10 when a high-frequency current flows to the outside of the heating coil 2 and the outside of the housing 1. doing.
The magnetic shield ring 17 is formed by connecting both ends of a strip-shaped conductive member so as to be electrically conductive. For example, a long member in one direction is bent into a circular shape, and is formed by providing a joining portion 18 that is crimped or welded, such as crimping an end portion, and is electrically conductive. Therefore, when a high-frequency magnetic field is generated by the heating coil 2, an eddy current flows through the magnetic shield ring 17 and is converted into heat by the internal resistance of the magnetic shield ring 17, thereby suppressing leakage magnetic flux.
And the coupling | bond part 18 which couple | bonded the both ends of the magnetic-shielding ring 17 is arrange | positioned among the several heating coils 2 hold | maintained by the coil base 6 between the heating coils 2 adjacent in planar view. For example, the space between adjacent heating coils 2 is arranged at a wide position.
In the present embodiment, the case where the magnetic shield ring 17 is formed in a circular shape so as to surround the outer periphery of the circular coil base 6 will be described, but the present invention is not limited to this.
The magnetic shield 17 corresponds to the “magnetic shield” in the present invention.

  The coil base 6 is provided with a ferrite 19 below the heating coil 2. The ferrite 19 has a purpose of preventing the magnetic field generated in the heating coil 2 from flowing downward from the heating coil unit 13 and concentrating the magnetic field on the object to be heated 10. In the present embodiment, as an installation example, a case where the heating coil 2 is made to be in a radial shape so as to be substantially orthogonal to the winding of the heating coil 2 is illustrated.

  A supported member 20 is formed on the lower surface of the coil base 6. The supported member 20 has, for example, a substantially cylindrical shape with an open bottom. Support means 7 is arranged at a position where the supported member 20 is supported. Examples of the support means 7 include an elastic body such as a compression spring. The support means 7 has an upper portion inserted into the supported member 20 of the coil base 6 and a lower portion disposed under the heating coil unit 13. 21 is fixed. Thereby, the coil base 6 is supported by the coil cooling duct 21 via the support means 7.

The support means 7 and the supported member 20 are disposed between adjacent heating coils in plan view. That is, between the plurality of heating coils 2 held by the coil base 6, the space between the adjacent heating coils 2 is arranged at a wide position. In this Embodiment, it arrange | positions at a total of four places between the 2nd heating coil 2b arrange | positioned divided | segmented into two places, and the 3rd heating coil 2c arrange | positioned divided | segmented into two places.
The number of support means 7 is not limited to this, and can be set as appropriate depending on the number and size of the heating coils 2 held by the coil base 6.
Moreover, although the example of FIG. 2 shows the case where it arrange | positions near the outer periphery between the adjacent heating coils 2, this invention is not limited to this. For example, it may be arranged near the center or inner circumference between adjacent heating coils 2. In the example of FIG. 2, the support means 7 is disposed between the second heating coil 2b and the third heating coil 2c, but the present invention is not limited to this. For example, you may arrange | position between the 1st heating coil 2a and the 2nd heating coil 2b, or between the 1st heating coil 2a and the 3rd heating coil 2c.

Moreover, the support means 7 is arrange | positioned in the position where the magnetic flux which arises from one heating coil 2 and the magnetic flux which arises from the other heating coil 2 become opposite in planar view among the adjacent heating coils 2. FIG. In the present embodiment, as indicated by the arrows shown in FIG. 2, the current flowing through the second heating coil 2b and the third heating coil 2c is between the second heating coil 2b and the third heating coil 2c. The configuration is such that the closest locations of the two are in the direction of canceling out, that is, in the opposite direction. In addition, since the high frequency current is supplied to each heating coil 2, the direction of the current changes alternately, and the direction of the current shown in FIG. 2 indicates the direction of the current at a certain moment.
Note that the inverter 3 may be driven so that the currents of the adjacent heating coils 2 have the same frequency and opposite phases, and the direction of the magnetic flux between the adjacent heating coils 2 may be reversed. Further, the winding direction of the winding is reversed in the adjacent heating coil 2 and the inverter 3 is driven so as to supply a high-frequency current having the same waveform, so that the direction of the magnetic flux between the adjacent heating coils 2 is reversed. It may be made to become.

  The support means 7 is provided inside the magnetic shield ring 17 in plan view. That is, the support means 7 is disposed inside the outer periphery of the coil base 6 and between the adjacent heating coils 2.

  Further, the support means 7 is provided below the coil base 6 at a position other than on a straight line connecting the centers of the plurality of heating coils 2. In the present embodiment, as shown in FIG. 2, each of the first heating coil 2a formed in a substantially circular shape, and the second heating coil 2b and the third heating coil 2c formed in a substantially elliptical shape are used. Support means 7 is arranged at a position other than a straight line connecting the centers.

The support means 7 is made of an elastic body such as a compression spring, for example, and supports the coil base 6 so as to press it against the back surface of the top plate 11.
A spacing member 22 is provided on the upper surface of the coil base 6 at an upper position facing the support means 7. In the state where the top plate 11 is provided, the spacing member 22 is pressed against the lower surface of the top plate 11. The coil base 6 and the heating coil 2 are disposed substantially parallel to the top plate 11 with a predetermined distance from the lower surface of the top plate 11. Thereby, the distance of the to-be-heated material 10 and the upper surface part of the heating coil 2 is maintained appropriately, and induction heating can be performed efficiently. Moreover, the space | interval of the heating coil 2 upper surface and the top plate 11 lower surface is maintained appropriately, and the cooling air which cools the heating coil 2 can pass between these. A part of the coil base 6 may be used as the material of the spacing member 22, but if the spacing member 22 is formed of an elastic material such as rubber which is a separate member from the coil base 6, the spacing member 22 and the top plate 11 Since the degree of adhesion is improved, it is possible to suppress the positional deviation of the heating coil unit 13 even when a strong impact is applied, such as when vibration is dropped. In the state where the top plate 11 is provided, the support means 7 is compressed by the top plate 11 and the coil cooling duct 21. By this reaction force, the spacing member 22 on the coil base 6 is pressed directly or indirectly against the top plate 11.
In addition, although the case where the space | interval holding member 22 was provided in the upper surface of the coil base 6 was demonstrated here, you may make it provide not only in this but in the back surface side of the top plate 11. FIG. That is, the spacing member 22 may be provided between the top plate 11 and the coil base 6 and above the support means 7.

  Further, the coil base 6 is provided with a gap 23 in the portion not holding the heating coil 2, the portion where the ferrite 19 is not provided, and the supported member 20, so that ventilation is possible. Moreover, it has a structure with little ventilation resistance, while the minimum rib which can bear the weight of the heating coil 2 to hold | maintain is formed.

  A coil cooling duct 21 is disposed below the coil base 6 so as to face each other. The coil cooling duct 21 is connected to a case (not shown) in which the control board is accommodated so that air after being blown from the cooling fan 14 and passing through the control board case flows into the coil cooling duct 21. It has become. Further, a plurality of jet holes 24 to be ejected toward the heating coil 2 are formed on the wall surface (upper surface) of the air passage on the upper surface of the coil cooling duct 21 (surface facing the coil base 6).

FIG. 3 is a block configuration diagram of the induction heating cooker according to the first embodiment.
In FIG. 3, the pan placement discriminating unit 4 discriminates in what positional relationship the article to be heated 10 is placed with respect to the heating coil 2, and outputs it to the control unit 8. The placement position of the object to be heated 10 is determined by comparing the projected area of each heating coil 2 viewed from the upper surface with the area of the bottom surface of the object to be heated 10, and the ratio of the projected area to the area of the bottom surface of the object to be heated 10 Is calculated by detecting the installation state of the object to be heated 10. Specific examples of the detection means include, for example, an installation state that is detected by the level of an illuminance sensor provided between the heating coils 2 or an impedance value that changes by passing a weak current through each heating coil 2. Any detection method can be used, such as one that detects.
The control unit 8 controls driving of the inverters 3a, 3b, and 3c based on an operation instruction from the operation unit 5, a detection result of the pan placement determination unit 4, and the like. In each inverter 3, the switching element is driven by a drive signal from the control unit 8, and a high frequency current is supplied to the heating coil 2.

(Operation)
Hereinafter, a specific flow of operation during heating will be described.
When a control command is input from the user via the operation unit 5, the control unit 8 controls the outputs of the first inverter 3a, the second inverter 3b, and the third inverter 3c to start / stop heating. At the same time as setting the thermal power, the cooling fan 14 is driven. The pan placement discriminating unit 4 discriminates in what positional relationship the object to be heated 10 is placed with respect to the heating coils 2a to 2c on the top plate 11 facing the heating coils 2a to 2c. The discrimination result by the pan placement discrimination unit 4 is output to the control unit 8, and the control unit 8 operates to control the inverters 3a to 3c based on the input discrimination result.

FIG. 4 is a diagram for explaining the heating drive operation according to the first embodiment.
FIG. 4 (1) shows an example in which the object to be heated 10 having an elliptical shape as viewed from above the heating coil 2 is placed in the left-right direction. At this time, the pan placement determination unit 4 has about 50% of the area of the bottom surface of the object to be heated 10 on the first heating coil 2a, and the area of the bottom surface of the object to be heated 10 on the second heating coil 2b. It is determined that about 40% of the area, and about 10% of the area of the bottom surface of the object to be heated 10 is placed on the third heating coil 2c. As a result, based on the output from the pan placement discriminating unit 4, the control unit 8 sets 1.8 kW, which is 60% of the maximum power 3.0 kW that can be input to the first heating coil 2a through the heating port, The inverters 3a and 3b are driven so that 1.2kW, which is 40% of the maximum power 3.0kW, is input to the second heating coil 2b, and the inverter 3c is operated so as not to input power to the third heating coil 2c. To do.

  FIG. 4 (2) shows an example in which the object to be heated 10 having an elliptical shape as viewed from above the heating coil 2 is placed in the vertical direction. At this time, the pan placement determination unit 4 has about 50% of the area of the bottom surface of the object to be heated 10 on the first heating coil 2a and the area of the bottom surface of the object to be heated 10 on the third heating coil 2c. It is judged that about 10% of the area of the bottom surface of the object to be heated 10 is placed on about 40% of the second heating coil 2b. As a result, based on the output from the pan placement discriminating unit 4, the control unit 8 sets 1.8 kW, which is 60% of the maximum power 3.0 kW that can be input to the first heating coil 2a through the heating port, The inverters 3a and 3c are driven so that 1.2 kW, which is 40% of the maximum power of 3.0 kW, is input to the third heating coil 2c, and the inverter 3c is operated so as not to input power to the second heating coil 2b. To do.

By driving the heating coil 2 by the operation as described above, the electronic component mounted on the inverter 3 self-heats and the temperature rises. Further, the heating coil 2 also self-heats and the temperature rises, and the magnetic shielding ring 17 that suppresses the leakage magnetic flux rises by induction heating.
Cooling air generated when the cooling fan 14 is driven is sucked from the air inlet 15 and flows into the case housing the control board 25. The cooling air flowing into the case of the control board 25 cools the electronic circuit components on the control board 25 and then flows into the coil cooling duct 21.
The cooling air flowing into the coil cooling duct 21 is ejected upward from the jet holes 24 on the upper surface of the coil cooling duct 21 to cool the heating coil 2 disposed above. Since many gaps 23 are provided in the coil base 6, the cooling air blown from the jet holes 24 reaches the heating coil 2 efficiently or while passing through the gap with the top plate 11.
The cooling air is also supplied directly or indirectly to the magnetic shield ring 17 and the ferrite 19 provided on the coil base 6. The cooling air that has cooled the heating coil 2 and the like forms an airflow toward the exhaust port 16 provided at the rear center of the upper surface of the housing 1 and is finally discharged from the exhaust port 16 to the outside of the housing 1.

  In the above description, a single heating coil unit 13 includes a first heating coil 2a formed in a substantially circular shape, a second heating coil 2b and a third heating coil 2c formed in a substantially elliptical shape, and However, the present invention is not limited to this. Only a substantially circular heating coil 2 or a plurality of substantially elliptical heating coils 2 may be arranged on the coil base 6. Also, the arrangement position can be arbitrarily set. For example, a plurality of heating coils 2 formed in a substantially elliptical shape may be arranged in a line. Hereinafter, such an arrangement example will be described with reference to FIG.

FIG. 5 is a top view showing another example of the heating coil unit according to the first embodiment.
In FIG. 5, the coil base 6 integrally holds the heating coil 2 that can be used alone or jointly as in the configuration of FIG. In plan view, the first heating coil 2a capable of heating the object to be heated 10 alone is arranged in the center of the coil base, and the second heating object 10 can be heated together with or alone with the first heating coil 2a. The heating coil 2b and the third heating coil 2c are arranged substantially symmetrically with the first heating coil 2a interposed therebetween.
Also in such an arrangement of the heating coil 2, the support means 7 is arranged between the adjacent heating coils 2 in plan view. The support means 7 is provided below the coil base 6 at a position other than a straight line connecting the centers of the heating coils 2 formed in a substantially elliptical shape. The support means 7 is provided inside the magnetic shield ring 17 in plan view.
Further, the coupling portion 18 of the magnetic shield ring 17 is disposed between the adjacent heating coils 2 in plan view. Other configurations are the same as those in FIG. 2 described above. Therefore, even in the case of the configuration of the coil base 6 that integrally holds a plurality of heating coils 2 that can be individually driven, such as the configuration of the heating coil unit as shown in FIG. 5, the effect of the present embodiment can be obtained. is there.

(effect)
As described above, in the present embodiment, the coil base 6 holds the plurality of heating coils 2 provided for one heating port 12 and the support means 7 that supports the coil base 6 is in plan view. It arrange | positions between the adjacent heating coils 2. FIG.
For this reason, since the support means 7 does not protrude greatly from the outer periphery of the heating coil unit 13, the area in which the support means 7 is installed can be made compact in the horizontal direction. Further, it is possible to prevent an increase in cost due to an increase in the number of electronic parts and wiring due to the substrate division, etc., which occurs when the size of the coil base 6 is increased. At the same time, it is not necessary to increase the rotational speed of the cooling fan 14 due to the decrease in the air passage area, that is, the increase in the ventilation resistance.

  Moreover, compared with the case where a some heating coil is separately mounted in a some coil base, respectively, the number of coil bases 6 can be decreased and a number of parts can be reduced. Further, the number of steps for attaching the heating coil unit 13 to the housing 1 is reduced, and the assembly cost can be reduced. Therefore, the induction heating cooker excellent in assemblability can be obtained.

Further, even if the size of the coil base 6 is increased, it can be supported from below at a location near the center of gravity of the plurality of heating coils 2 as compared with the case where the support means 7 is provided on the outer peripheral portion of the coil base 6. The bending of the coil base 6 can be prevented. In particular, it is possible to prevent the coil base 6 formed of a thermoplastic resin from being bent due to a high temperature during use. Therefore, the induction heating cooker 100 with high strength and high reliability of the coil base 6 can be provided.
If the support means 7 is provided on the outer periphery of the coil base 6, a large number of ribs are provided on the coil base 6 to support the weight of the plurality of heating coils 2. It becomes the coil unit 13.

  Further, since the heating coil 2 is not hidden by the support means 7 when viewed from the jet hole 24 provided on the upper surface of the coil cooling duct 21, the cooling air ejected from the jet hole 24 is obstructed by the support means 7. Therefore, the heating coil unit 13 which can easily reach the heating coil 2 and has an excellent cooling capacity can be configured.

Further, even when the heating coil unit 13 is installed in the housing 1, it becomes easy to confirm the positional relationship between the supported member 20 and the support means 7 from above the heating coil unit 13, so that the supported member has a substantially cylindrical shape. 20 can be easily operated even when the upper portion of the support means 7 is inserted into the support means 7, and an induction heating cooker excellent in assemblability can be provided.
If the support means 7 is provided below the heating coil 2 or the like, it is extremely difficult to confirm the positional relationship between the supported member 20 and the support means 7 from above the heating coil unit 13.

Moreover, in this Embodiment, the support means 7 is the position where the magnetic flux which arises from one heating coil 2 and the magnetic flux which arises from the other heating coil 2 are opposite in planar view among the adjacent heating coils 2. Has been placed.
For this reason, even when the support means 7 is comprised with electroconductive materials, such as a metal compression spring, it can be made difficult to be induction-heated and the temperature rise by heating can be suppressed. Therefore, it is possible to prevent deterioration of the coil cooling duct 21 and the supported member 20 that are in contact with the support means 7 due to high temperature.
If the support means 7 is provided below the heating coil 2, when it is made of a material that is induction-heated such as a metal compression spring, it is heated by induction heating, and deterioration and oxidation of peripheral parts are caused. There is a risk of promoting.

Further, in the present embodiment, the plurality of heating coils 2 are formed in a substantially circular shape or a substantially elliptical shape in plan view, and the support means 7 is located at the center of the plurality of heating coils 2 below the coil base 6. It is provided at a position other than on a straight line connecting the two.
For this reason, the distance between the substantially circular or substantially elliptical heating coil 2 and the support means 7 can be increased, and the influence of the support means 7 due to induction heating can be reliably prevented. In addition, the size of the coil base 6 can be reduced to increase the area for peripheral electronic components and air passages.

Further, in the present embodiment, a magnetic shielding ring 17 is provided on the outer periphery of the coil base 6 so as to surround the plurality of heating coils 2 and suppresses magnetic flux leakage from the plurality of heating coils.
Thereby, the leakage magnetic flux from the some heating coil 2 can be reduced. Further, the number of parts can be reduced without providing the magnetic-shielding ring 17 for each of the plurality of heating coils 2, and the part cost and assembly cost can be reduced.

  In the present embodiment, since the coupling portion 18 of the magnetic shield ring 17 is provided between the plurality of heating coils 2 held by one coil base 6 in plan view, when the contact resistance is large and current flows. The distance between the coupling portion 18 and the heating coil 2 that are locally heated is increased, the current value that flows by induction heating is reduced, and the temperature of the coupling portion 18 can be prevented from being increased. Thereby, a durable and reliable induction heating cooker can be provided.

  In the present embodiment, since the spacing member 22 is provided between the top plate 11 and the coil base 6 and above the support means 7, the coil base 6 is supported via the supported member 20. Even in the state of being pushed up from below by the means 7, the coil base 6 can be prevented from being bent because it is pressed from above by the top plate 11 with the interval holding member 22 interposed therebetween. In particular, it is possible to prevent the coil base 6 formed of a thermoplastic resin from being bent due to a high temperature during use. Therefore, the induction heating cooker 100 with high strength and high reliability of the coil base 6 can be provided.

  In the present embodiment, the case where the induction heating cooker 100 is used as a built-in type (system kitchen integrated type) IH cooking heater has been described as an example. However, the present invention is not limited to this. Needless to say, the same effects can be obtained even when used in a cooking heater.

  As described above, the induction heating cooker according to the present invention can be applied to the use of a stationary induction heating cooker as well as a built-in type.

  DESCRIPTION OF SYMBOLS 1 Case, 2 Heating coil, 3 Inverter, 4 Pan mounting discrimination | determination part, 5 Operation part, 6 Coil base, 7 Support means, 8 Control part, 9 Grill, 10 To-be-heated object, 11 Top plate, 12 Heating port, 13 Heating coil unit, 14 Cooling fan, 15 Intake port, 16 Exhaust port, 17 Magnetic shield ring, 18 Coupling part, 19 Ferrite, 20 Supported member, 21 Coil cooling duct, 22 Spacing member, 23 Air gap, 24 Jet hole, 25 Control board, 100 induction heating cooker.

Claims (7)

A top plate on which an object to be heated is placed;
A heating port formed on the top plate and indicating a placement position of the object to be heated;
A heating coil disposed below the top plate and provided in plural for one heating port;
A holding member that integrally holds the plurality of heating coils provided for one heating port;
A support means provided below the holding member and supporting the holding member;
A drive circuit for supplying a high-frequency current to the heating coil ;
With
The support means is
Among the heating coils provided in plural for one heating port, between the heating coils adjacent in a plan view, disposed outside the heating coil in a plan view,
Among the heating coils adjacent the magnetic flux generated from the magnetic flux and the other heating coils arising from one of the heating coils, induction cooker you characterized in that it is arranged at a position to be opposite in a plan view. A top plate on which an object to be heated is placed;
A heating port formed on the top plate and indicating a placement position of the object to be heated;
A heating coil disposed below the top plate and provided in plural for one heating port;
A holding member for holding the plurality of heating coils provided for one heating port;
A support means provided below the holding member and supporting the holding member;
A drive circuit for supplying a high-frequency current to the heating coil;
With
The support means is
Composed of conductive material,
Among the heating coils provided in plural for one heating port, between the heating coils adjacent in plan view, the magnetic flux generated from one heating coil and the other heating among the adjacent heating coils An induction heating cooker characterized in that a magnetic flux generated from a coil is arranged at a position that is opposite in plan view. The plurality of heating coils are:
In plan view, it is formed in a substantially circular or substantially elliptical shape,
The support means is
The induction heating cooker according to claim 1 or 2 , wherein the induction heating cooker is provided at a position other than a straight line connecting the centers of the plurality of heating coils, below the holding member. Provided on the outer periphery of the holding means so as to surround the plurality of heating coils, and includes a magnetic shielding means for suppressing magnetic flux leakage from the plurality of heating coils,
The induction heating cooker according to any one of claims 1 to 3 , wherein the supporting means is provided inside the magnetic shielding means in a plan view. A top plate on which an object to be heated is placed;
A heating port formed on the top plate and indicating a placement position of the object to be heated;
A heating coil disposed below the top plate and provided in plural for one heating port;
A holding member for holding the plurality of heating coils provided for one heating port;
A support means provided below the holding member and supporting the holding member;
Magnetic shielding means provided around the holding means so as to surround the plurality of heating coils, and suppressing magnetic flux leakage from the plurality of heating coils;
With
The support means is
Inside the magnetic shield means in plan view,
Among the heating coils provided in plural for one heating port, the heating coils are arranged between the heating coils adjacent in a plan view,
The magnetic shielding means includes
It is formed by connecting both ends of a strip-shaped conductive member so as to be electrically conductive,
An induction heating cooker characterized in that a coupling portion obtained by coupling the both end portions is disposed between the heating coils adjacent in a plan view. The support means is
The induction heating cooker according to any one of claims 1 to 5 , wherein the holding member is supported so as to be pressed against a back surface of the top plate. An interval holding member is provided between the top plate and the holding member and above the support means, and maintains an interval between the top plate and the plurality of heating coils at a predetermined interval. The induction heating cooker according to any one of claims 1 to 6 , characterized in that

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