JP4970092B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker including a plate-shaped heating body that is disposed between a top plate and an induction heating coil and heats a cooked object placed on the top plate.

  In an induction heating cooker, for example, when a cooked appliance made of a material with low permeability and high electrical conductivity such as aluminum or copper is used, the cooked appliance is repelled from the upper surface of the top plate. "Phenomenon may occur. Therefore, in order to be able to heat regardless of the material of the cooked utensil, there is a problem of how to effectively heat the pan so that the “pot floating” phenomenon does not occur.

  As a prior art for solving this problem, Patent Document 1 discloses that a heating element made of aluminum is disposed between a top plate and an induction heating coil, and an induction current is induced in the heating element by the induction heating coil to form a joule. The structure which generates heat (henceforth induction heating) and heats a to-be-heated cooking appliance by this is disclosed. However, the technique disclosed in Patent Document 1 has a problem in that heating efficiency is poor because the cooking utensil is indirectly heated by induction heating of the heating element.

Therefore, in recent years, an induction heating cooker in which a support is fixed between the top plate and the induction heating coil, and a plate-like heating element having an energization heating element that generates heat when energized is disposed on the upper surface of the support. Is considered. According to this thing, the to-be-heated cooking appliance mounted on the top plate can be heated by any one or both of an induction heating coil and a plate-shaped heating body, and the improvement of a heating efficiency is aimed at. Can do.
Japanese Patent No. 3465712

  By the way, when manufacturing an induction heating cooker, it is desired to improve the assemblability by easily assembling the plate-shaped heating body as described above. Further, even after the plate-like heating body is assembled, it is necessary to prevent the plate-like heating body from being displaced from the support body or falling off from the support body.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the assembling property when assembling the plate-shaped heating body, and to prevent the position of the plate-shaped heating body from shifting relative to the support even after the assembly. Another object of the present invention is to provide an induction heating cooker that can prevent falling off from the support.

An induction heating cooker according to the present invention includes a top plate on which a cooked appliance to be heated is placed, and induction heating that is disposed below the top plate and induction-heats the cooked appliance placed on the top plate. Plate heating which has a coil and an energization heating element which generates heat when energized, is disposed between the top plate and the induction heating coil and heats the cooked utensil placed on the top plate A body, a support disposed between the plate-shaped heating body and the induction heating coil to support the plate-shaped heating body, and a plate fixed to the edge of the lower surface of the plate-shaped heating body on the upper side A coupling means comprising a coupling member having a cylindrical heating body side coupling portion and a supporting body side coupling portion on the lower side, and disposed between the plate heating body and the support, at least in the plate heating body The plate-like heating element side joint is fixed Equipped with a heat insulating material having a relief means capable of accommodating portions, the plate-like heating member and the support member wherein the heat insulating material, the plate-shaped heating body side coupling part is the plate-like heating body of the coupling member The support-side coupling portion is united by being coupled to the support, and is arranged between the top plate and the induction heating coil in this unitized form, A lead wire for energizing the energization heating element of the heating body is connected to a lower surface of the plate-like heating body, and the escape means of the heat insulating material is a portion where the lead wire is connected to the plate-like heating body It is formed so that the part to which the said plate-shaped heating body side coupling | bond part is fixed including can be accommodated .

According to the induction heating cooker of the present invention, since the plate-shaped heating body, the support, and the heat insulating material are combined by the coupling means to form a unit, the plate-shaped heating body , the support, and the heat insulating material are assembled. In this case, the plate-like heating body , the support body, and the heat insulating material can be handled as one unitized part, and assemblability can be improved. Further, even after the plate-like heating body , the support body, and the heat insulating material are assembled, it is possible to prevent the plate-like heating body from being displaced relative to the support body and from falling off the support body.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 shows the induction heating cooker 1 incorporated in the system kitchen. The induction heating cooker 1 includes a main body case 2 and a top plate 3 disposed above the main body case 2, and the top plate 3 constitutes the upper surface of the induction heating cooker 1.

The top plate 3 is provided with mounting portions 4 at, for example, two places, and for example, a pan (only a part of the bottom portion is shown in FIG. 1) is mounted on the mounting portions 4 as the cooking utensils 5 to be heated. Is done. A circular induction heating coil 6 is disposed below each of the mounting portions 4, and a plate-like heating having a size equivalent to that of the induction heating coil 6 is provided between the top plate 3 and the induction heating coil 6. A body 7 is arranged. A temperature detection unit 8 composed of a thermistor or the like is provided at a portion of the lower surface of the top plate 3 that is directly below the center of each mounting unit 4. The door 10 is provided, and the user can perform various operations related to heating of the cooked utensil 5 by the operation panel 9. In addition, an oven (not shown) is connected behind the oven door 10 (inside the main body case 2).

  A coil base 11 is provided inside the induction heating cooker 1 and above the main body case 2, and the induction heating coil 6 described above is attached to the upper surface of the coil base 11. These induction heating coils 6 are provided below the top plate 3 so as to face the placement unit 4, and are configured to be able to induction-heat the cooked utensil 5 placed on the placement unit 4. ing.

Further, as shown in FIG. 1, a magnetic path of magnetic flux of each induction heating coil 6 is formed on the surface (lower surface) opposite to the surface (upper surface) supporting the induction heating coil 6 in the coil base 11. The circular ferrite 12 is arranged so as to be concentric with the induction heating coil 6. The ferrite 12 is formed to be approximately the same size as the induction heating coil 6.
The support 13 disposed above each induction heating coil 6 is made of a heat-resistant plastic (for example, PPS resin: polyphenylene sulfide resin), and is fixed to the coil base 11 via a magnetic shield ring 14. A recess 16 is formed on the upper surface of the support 13, and the plate-like heating body 7 is supported on the upper surface of the recess 16 via a heat insulating material 15.

  The coupling member 17 (corresponding to the coupling means) is made of a low magnetic permeability metal (for example, aluminum, copper, nonmagnetic stainless steel, etc.). The coupling member 17 is formed in a thin plate shape as a whole, and includes a brazing portion 17a (corresponding to a plate-like heating body side coupling portion) on the upper side, and a locking portion 17b (corresponding to the support side coupling portion) on the lower side. Equivalent). The brazing portion 17a is formed substantially parallel to the plate-like heating body 7, and is fixed to the step portion 18 provided on the outer edge portion and the inner edge portion of the plate-like heating body 7 by brazing. The locking portion 17 b is formed substantially parallel to the lower surface of the support body 13 and is locked to the lower surface of the support body 13. Thereby, the plate-shaped heating body 7, the support body 13, and the heat insulating material 15 are united by being coupled by the coupling member 17.

  With such a configuration, the plate-like heating body 7 is disposed between the induction heating coil 6 and the top plate 3 while being supported by the support 13. In this case, the upper surface side of the plate-like heating body 7 slightly protrudes upward from the upper end of the support 13, and each coil base 11 is supported by the main body case 2 via a plurality of compression coil springs 19. The plate-like heating body 7 is pressed against the lower surface of the top plate 3 by the elastic force of the compression coil spring 19. A heat transfer member 20 made of, for example, gold foil or aluminum foil is disposed between the top plate 3 and the plate-like heating body 7. The heat transfer member 20 has heat transfer properties and is soft and conformable (ductility, malleability), and functions as a heat transfer layer in close contact with the lower surface of the top plate 3 and the upper surface of the plate-like heating body 7. Take on.

  Further, the stepped portion 18 is a step that is deeper than at least the thickness dimension of the brazed portion 17 a of the coupling member 17, and the brazed portion 17 a is the lower surface of the top plate 3 when the plate-like heating body 7 is assembled. So that it doesn't interfere with.

Next, the structure of the plate-shaped heating body 7, the support body 13, and the heat insulating material 15 is demonstrated with reference to FIG. 3 and FIG.
FIG. 3 is a perspective view showing the plate-like heating body 7, the heat insulating material 15, the support 13 and the induction heating coil 6 in a stage before assembly. The plate-like heating body 7 is composed of four unit heating bodies 21 and has a substantially disk shape with four sides protruding. The four unit heaters 21 are all of the same configuration and have a substantially quarter-circle shape.

  As shown in FIG. 4, each unit heating body 21 is configured by combining two ceramic substrates 22 and 23. The ceramic substrates 22 and 23 are made of, for example, aluminum nitride, and an energization heating element 24 is attached to one surface of each ceramic substrate 22 by pattern printing. The energization heating element 24 is made of a non-magnetic resistance heating material such as tungsten (a material that generates Joule heat when energized), and is formed in a meandering linear shape on the ceramic substrate 22.

  On the other hand, a notch portion 25 for forming a stepped portion is provided at both ends of the outer edge portion of each ceramic substrate 23 and at the center of the inner edge portion. In addition, a notch portion 23a for forming a lead wire connecting portion is provided at a position facing the both end portions 24a of the energization heating element 24 at the outer edge portion of each ceramic substrate 23. Then, the two ceramic substrates 22 and 23 are stacked and fired so as to sandwich the energization heating element 24, so that the ceramic substrates 22 and 23 are cured and fixed and integrated with each other. As a result, the energization heating element 24 is integrated in a state of being overlapped between the two ceramic substrates 22 and 23, and the step portion 18 (see FIGS. 1 and 3) is formed at both ends of the outer edge portion and at the center of the inner edge portion. In addition, the unit heating body 21 including the lead wire connecting portion 21a is formed at a position facing both end portions 24a of the energization heating element 24.

  A lead wire 26 (see FIG. 3) for energizing the energization heating element 24 is connected to both end portions 24a of the energization heating element 24 in the lead wire connection portion 21a. In this case, the lead wire connecting portion 21 a has a step deeper than at least the diameter of the lead wire 26, so that the lead wire 26 does not interfere with the lower surface of the top plate 3 when the plate-like heating body 7 is assembled. It has become.

  The heat insulating material 15 is composed of four unit heat insulating bodies 27 and has a substantially disk shape with four sides protruding, like the plate-like heating body 7. This heat insulating material 15 is comprised from the assembly sheet | seat of the fibrous ceramic. The concave portions 16 of the support 13 are shallowly provided at four locations on the upper surface of the support 13 so as to accommodate the unit heating body 21 and the unit heat insulator 27 described above. In addition, through holes 28 through which the above-described coupling members 17 can be inserted are provided at both ends of the outer edge portion and at the center of the inner edge portion at the bottom of the recess 16.

FIG. 5 is a functional block diagram showing the electrical configuration of the control system of the induction heating cooker 1. The heating control device 29 is configured to include a microcomputer (not shown) inside the main body case 2, and performs heating control of the induction heating coil 6 and the plate-like heating body 7 and material determination of the cooking utensil 5 to be heated. The heating control device 29 is configured to receive an operation signal from the operation panel 9 and a temperature detection signal from the temperature detection unit 8.
The inverter 30 is supplied with AC input from a commercial AC power supply 31 as DC power via a rectifier circuit 32 after being converted into DC. The heating control device 29 is configured to control the inverter 30 based on the input signal and a previously stored control program, and to supply the high-frequency current to the induction heating coil 6 via the inverter 30 to control the heating. Yes.

A resonance capacitor 33 is connected to the induction heating coil 6 in series. Since the induction heating coil 6 and the resonant capacitor 33 perform output adjustment according to the material of the cooking utensil 5 or the like, the induction heating coil 6 may have a variable number of turns (for example, a multistage coil configuration). Alternatively, the resonance capacitor 33 may have a variable capacitance.
The AC input from the commercial AC power supply 31 is also supplied to a plate-like heating body energization control unit 34 including a switching element (not shown) such as a triac. The plate-like heating body energization control unit 34 controls the supply of AC power to the plate-like heating body 7, and the energization amount is adjusted by a command from the heating control device 29.

  Further, current transformers 35 and 36 are arranged on the input side of the rectifier circuit 32 and the output side of the inverter 30, respectively, and those detection signals are given to the heating control device 29. The heating control device 29 detects the input current to the induction heating cooker 1 and the output current (coil current) of the inverter 30.

  The heating control device 29 determines whether or not the cooked utensil 5 is a high-resistance metal material. Although details are omitted, for example, a constant high-frequency current is supplied to the induction heating coil 6 to input current and the inverter 30. The determination is made based on the relationship with the output current. For example, when the cooking device 5 to be heated is a magnetic material such as iron, the magnetic flux generated by the induction heating coil 6 easily flows to the cooking device 5 to be heated, and the skin effect (the induction heating coil 6 at the bottom of the cooking device 5 to be heated). The effect of concentrating eddy currents on the side) is also large, so the equivalent resistance of the induction heating coil 6 is also large.

  On the other hand, when the cooked appliance 5 is a non-magnetic and low resistance material such as aluminum or copper, the magnetic flux generated by the induction heating coil 6 hardly flows to the cooked appliance 5, and the cooked appliance 5 is Hard to be heated. Since the specific resistance is small and the skin effect is small, the equivalent resistance is also small. As a result, the material is determined based on the change in magnitude between the input current and the output current, and induction heating by the induction heating coil 6 and heating by the plate-like heating body 7 can be executed based on a preset input power setting value. It has a configuration.

Next, a method for assembling the plate-like heating body 7 in the above configuration will be described.
At the stage before assembly (see FIG. 3), the brazing portion 17a of the coupling member 17 is fixed to the stepped portion 18 of the plate-like heating body 7 (unit heating body 21) by brazing. In this case, only the brazing portion 17a is provided in the coupling member 17, and the lower end portion (the portion that becomes the locking portion 17b after attachment) is not bent as shown in FIG. It is in a state facing downward so that it can be inserted into the insertion hole 28 of the support 13.

  From this state, the plate-like heating body 7 (unit heating body 21) is accommodated in the recess 16 of the support 13 so as to overlap the heat insulating material 15 (unit heat insulating body 27). At this time, the plate-like heating body 7 and the heat insulating material 15 are accommodated in the concave portion 16 of the support body 13 while the lower end portion of the coupling member 17 is inserted into the insertion hole 28. Thereafter, the lower end of the coupling member 17 inserted through the insertion hole 28 is bent inward to form a locking portion 17b, and the plate-like heating body 7, the support 13 and the heat insulating material 15 are combined to form a unit. To do. In this unitized form, the support 13 is fixed to the coil base 11, whereby the plate-like heating body 7, the support 13 and the heat insulating material 15 are placed between the top plate 3 and the induction heating coil 6. Deploy.

  As described above, according to the present embodiment, the plate-shaped heating body 7, the support 13, and the heat insulating material 15 are combined and unitized by the coupling member 17. When the support 13 and the heat insulating material 15 are assembled, the plate-like heating body 7, the support 13 and the heat insulating material 15 can be handled as one unitized part, and the assemblability can be improved. Further, even after the plate-like heating body 7, the support 13 and the heat insulating material 15 are assembled, it is possible to prevent the plate-like heating body 7 from being displaced relative to the support 13 and falling off from the support 13. For example, when the induction heating cooker 1 is transported as a product, the coil base 11 may move downward due to vibrations or impacts. In this case as well, the support for the plate-like heating body 7 is used. Therefore, it is possible to avoid positional deviation with respect to 13 and dropout from the support 13.

  Since the stepped portion 18 is provided in the plate-shaped heating body 7, the brazed portion 17 a of the coupling member 17 is fixed to the stepped portion 18 by brazing, and the locking portion 17 b is locked to the lower surface of the support body 13. Further, the plate-like heating body 7, the support 13 and the heat insulating material 15 can be combined more firmly into a unit. In addition, the coupling member 17 is unlikely to be detached from the plate-like heating body 7 and the support body 13, and the displacement of the plate-like heating body 7 with respect to the support body 13 and the drop-off from the support body 13 can be further prevented.

Since the coupling member 17 is made of a low permeability metal, it is possible to avoid the coupling member 17 from being heated by the induction heating coil 6.
Since the heat transfer member 20 that is in close contact with the lower surface of the top plate 3 and the upper surface of the plate heater 7 is provided between the top plate 3 and the plate heater 7, the heat generated from the plate heater 7 is topped. It is possible to efficiently transmit to the plate 3. Further, since the heat transfer member 20 has familiarity, the heat transfer member 20 is in close contact with the top plate 3 and the surface of the plate-like heating body 7 so as to absorb the shape (such as fine irregularities), so that more efficient heat can be obtained. Transmission can be realized.

The step portion 18 is at least a step deeper than the thickness of the brazing portion 17a of the coupling member 17, and the lead wire connecting portion 21a is at least a step deeper than the diameter of the lead wire 26, and the brazing portion 17a and the lead The line 26 is configured not to interfere with the lower surface of the top plate 3. Thus, the brazed portion 17a and the lead wire 26 do not protrude above the plate-like heating body 7, and the plate-like heating body 7 can be brought into close contact with the top plate 3, and the plate-like heating body 7 is heated. Efficient heat transfer to the cooking utensil 5 can be realized.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, description is abbreviate | omitted about the part same as 1st Embodiment mentioned above, and only a different part is demonstrated.

  As shown in FIG. 6, a fitting portion 42 is provided in a portion of the support 41 that faces the induction heating coil 6, and the fitting portion 42 is made of an inorganic material (for example, petalite) having a low linear expansion coefficient. The hard heat insulating material 43 is fitted. Thereby, the shallow recessed part 44 for accommodating the plate-shaped heating body 7 and the heat insulating material 15 is formed in the upper surface of the support body 41, and the plate-shaped heating body 7 is heat-insulated on the upper surface of the hard heat insulating material 43 which forms the recessed part 44. It is supported via a material 15. And the plate-shaped heating body 7 and the support body 41 are united by being coupled by the coupling member 17 in the same manner as shown in the first embodiment.

Next, the structure of the support body 41 and the hard heat insulating material 43 is demonstrated with reference also to FIG. 7 and FIG.
The fitting portion 42 is formed in a form in which a circular opening provided in a portion of the support body 41 facing the induction heating coil 6 is divided into four portions by a beam portion 45a and a ring portion 45b. The part 42 is opened in a substantially fan shape. As shown in FIG. 8, a protruding portion 46 that supports the hard heat insulating material 43 is provided on the side surface of the beam portion 45 a. The hard heat insulating material 43 is composed of four unit hard heat insulating bodies 47 like the plate-like heating body 7 and has a substantially disk shape as a whole.

Next, a method for assembling the plate-like heating body 7 in the above configuration will be described.
From the state shown in FIG. 7, the hard heat insulating material 43 is fitted into the fitting portion 42 of the support body 41 to form the concave portion 44, and the plate-like heating body 7 is stacked on the heat insulating material 15 and accommodated in the concave portion 44. . At this time, the plate-like heating body 7 and the heat insulating material 15 are accommodated in the concave portion 44 of the support body 41 while the lower end portion of the coupling member 17 is inserted into the insertion hole 28. Thereafter, the lower end portion of the coupling member 17 inserted through the insertion hole 28 is bent inward to form a locking portion 17b, and the plate-like heating body 7, the support body 41, and the heat insulating material 15 are combined to form a unit. To do. In this unitized form, the support body 41 is fixed to the coil base 11, whereby the plate-like heating body 7, the support body 41 and the heat insulating material 15 are arranged between the top plate 3 and the induction heating coil 6. To do.

  As described above, according to the present embodiment, the portion of the support body 41 that faces the induction heating coil 6 (the bottom portion of the recess 44) is configured by the hard heat insulating material 43, so the plate-shaped heating body 7 and the induction heating coil 6 can be further enhanced, and the induction heating coil 6 can be provided at a position closer to the top plate 3. Thereby, the magnetic flux which the induction heating coil 6 generate | occur | produces becomes easy to reach the to-be-heated cooking appliance 5, and effective heating cooking can be performed. Moreover, since the support body 41 can be comprised with a plastic member etc., while being able to aim at cost reduction, since the hard heat insulating material 43 was formed from the inorganic material with a low linear expansion coefficient, the plate-shaped heating body 7 is used. Even when heat cooking is performed at a high temperature, the hard heat insulating material 43 does not expand, and the support 41 can be prevented from being damaged.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, description is abbreviate | omitted about the part same as 1st Embodiment mentioned above, and only a different part is demonstrated.

  As shown in FIG. 9, the plate-like heating body 51 is supported on the upper surface of the recess 53 of the support body 52 via a heat insulating material 54. The coupling member 55 (corresponding to the coupling means) is made of a low magnetic permeability metal. The coupling member 55 is formed in a thin plate shape as a whole, and includes a brazing portion 55a (corresponding to a plate-like heating body side coupling portion) on the upper side, and a locking portion 55b (on the support body side coupling portion) on the lower side. Equivalent). The brazing portion 55a is formed substantially parallel to the plate-like heating body 51, and is fixed to the outer edge portion and the inner edge portion of the lower surface of the plate-like heating body 51 by brazing. The locking portion 55 b is formed substantially parallel to the lower surface of the support body 52, and is locked in a locking groove 56 provided on the lower surface of the support body 52. Thereby, the plate-shaped heating body 51, the support body 52, and the heat insulating material 54 are united by being coupled by the coupling member 55.

  Further, the outer edge portion and the inner edge portion of the heat insulating material 54 are coupled member cutout portions 57 (to escape means) that can accommodate portions where the brazed portions 55a of the coupling member 55 are fixed on the lower surface of the plate-like heating body 51. The brazing portion 55 a does not interfere with the heat insulating material 54 in a state where the plate-like heating body 51 is stacked on the heat insulating material 54.

Next, the structure of the plate-shaped heating body 51 and the heat insulating material 54 will be described with reference to FIGS. 10 and 11 as well.
FIG. 10 is a perspective view showing the plate-like heating body 51, the heat insulating material 54, the support body 52, and the induction heating coil 6 in a stage before assembly. The plate-shaped heating body 51 is composed of four unit heating bodies 58 and has a substantially disk shape with four sides protruding. The four unit heaters 58 have the same configuration and have a substantially quarter-circle shape.

  Each unit heating body 58 includes a single ceramic substrate 59 as shown in FIG. This ceramic substrate 59 is made of, for example, aluminum nitride, and a non-magnetic material is provided on one surface of each ceramic substrate 59 (the surface on the lower side in FIGS. 9 and 10), as in the first embodiment. An energization heating element 60 made of a resistance heating material is formed in a meandering linear shape. At both ends of the energization heating element 60, lead wires 61 for energizing the energization heating element 60 extend from the lower surface (upper surface in FIG. 11) of the ceramic substrate 59 (plate heating element 51). Connected.

  On the lower surface of each ceramic substrate 59, brazing portions 55a of the coupling member 55 are fixed by brazing at both ends of the outer edge portion and at the center of the inner edge portion. In this case, only the brazing portion 55a is provided in the coupling member 55, and the lower end portion (the portion that becomes the locking portion 55b after attachment) is not bent as shown in FIG. It is in a state facing downward (upward in FIG. 11) so that it can be inserted into the insertion hole 62 (see FIG. 10) of the support body 52.

  As shown in FIG. 10, the heat insulating material 54 includes four unit heat insulating bodies 63, and has a substantially disk shape with four sides protruding, like the plate-like heating body 51. Further, a lead wire cutout portion 64 capable of accommodating a portion where the lead wire 61 is connected on the lower surface of the plate-like heating body 51 is provided on the outer edge portion of the heat insulating material 54. The lead wire 61 is prevented from interfering with the heat insulating material 54 in a state of being stacked on the heat insulating material 54. The lead wire cutout portion 64 functions as the escape means together with the coupling member cutout portion 57 described above.

Next, a method for assembling the plate-like heating body 51 in the above configuration will be described.
From the state shown in FIG. 10, the plate-like heating body 51 is accommodated in the recess 53 of the support body 52 so as to overlap the heat insulating material 54. At this time, the plate-like heating body 51 and the heat insulating material 54 are accommodated in the recess 53 of the support body 52 while the lower end portion of the coupling member 55 is inserted into the insertion hole 62. Thereafter, the lower end portion of the coupling member 55 inserted through the insertion hole 62 is bent outward to form a locking portion 55b, and the plate-shaped heating body 51, the support body 52, and the heat insulating material 54 are coupled to form a unit. To do. In this unitized form, the support body 52 is fixed to the coil base 11, whereby the plate-like heating body 51, the support body 52, and the heat insulating material 54 are placed between the top plate 3 and the induction heating coil 6. Deploy.

  As described above, according to the present embodiment, the plate-like heating body 51, the support body 52, and the heat insulating material 54 are firmly coupled by the coupling member 55 to form a unit. As a result, it is possible to prevent the positional deviation of the plate-like heating body 51 from the support body 52 and the dropout from the support body 52 even after the assembly.

  Further, in the state where the notch portion 57 for the coupling member and the notch portion 64 for the lead wire are provided and the plate-like heating body 51 is overlapped with the heat insulating material 54, the brazing portion 55a and the lead wire 61 do not interfere with the heat insulating material 54. It was configured as follows. Thereby, in the form which united the plate-shaped heating body 51, the support body 52, and the heat insulating material 54, thickness reduction of an up-down direction can be achieved, and the parallelism of the plate-shaped heating body 51 can be maintained, Therefore A plate-shaped heating body 51 can be easily brought into close contact with the top plate 3, and efficient heat transfer from the plate-like heating body 51 to the cooked utensil 5 can be realized.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, description is abbreviate | omitted about the part same as 3rd Embodiment mentioned above, and only a different part is demonstrated.

  As shown in FIG. 12, a fitting portion 72 is provided in a portion of the support 71 that faces the induction heating coil 6, and the fitting portion 72 has a hard heat insulation made of an inorganic material having a low linear expansion coefficient. A material 73 is fitted. Thereby, the shallow recessed part 74 for accommodating the plate-shaped heating body 51 and the heat insulating material 54 is formed in the upper surface of the support body 71, and the plate-shaped heating body 51 is heat-insulated on the upper surface of the hard heat insulating material 73 which forms the recessed part 74. It is supported via a material 54. And the plate-shaped heating body 51 and the support body 71 are united by being coupled by the coupling member 55 as in the case of the third embodiment described above.

Next, the structure of the support body 71 and the hard heat insulating material 73 is demonstrated with reference also to FIG.
The fitting portion 72 is formed in a form in which a circular opening provided in a portion of the support 71 facing the induction heating coil 6 is divided into four portions by a beam portion 75a and a ring portion 75b. The part 72 is opened substantially in a fan shape. On the side surface of the beam portion 75a, an overhang portion (not shown) that supports the hard heat insulating material 73 is provided in the same manner as the beam portion 45a (see FIG. 8) shown in the second embodiment. The hard heat insulating material 73 is composed of four unit hard heat insulating materials 76 in the same manner as the plate-like heating member 51, and has a substantially disk shape as a whole.

Next, a method for assembling the plate-like heating body 51 in the above configuration will be described.
From the state shown in FIG. 13, the hard heat insulating material 73 is fitted into the fitting portion 72 of the support 71 to form the concave portion 74, and the plate-like heating body 51 is stacked on the heat insulating material 54 and accommodated in the concave portion 74. . At this time, the plate-like heating body 51 and the heat insulating material 54 are accommodated in the recess 74 of the support 71 while the lower end of the coupling member 55 is inserted into the insertion hole 62. Thereafter, the lower end portion of the coupling member 55 inserted through the insertion hole 62 is bent outward to form a locking portion 55b, and the plate-shaped heating body 51, the support body 71, and the heat insulating material 54 are coupled to form a unit. To do. In this unitized form, the support 71 is fixed to the coil base 11, whereby the plate-like heating body 51, the support 71 and the heat insulating material 54 are arranged between the top plate 3 and the induction heating coil 6. To do.

  As described above, according to the present embodiment, the portion of the support 71 that faces the induction heating coil 6 (the bottom portion of the recess 74) is configured by the hard heat insulating material 73, so the plate-like heating body 51 and the induction heating coil are configured. 6 can be further enhanced, and the induction heating coil 6 can be provided at a position closer to the top plate 3. Thereby, the magnetic flux which the induction heating coil 6 generate | occur | produces becomes easy to reach the to-be-heated cooking appliance 5, and effective heating cooking can be performed. Moreover, since the support body 71 can be comprised with a plastic member etc., while being able to aim at cost reduction, since the hard heat insulating material 73 was formed from the inorganic material with a low linear expansion coefficient, the plate-shaped heating body 51 is used. Even when cooking is performed at a high temperature, the hard heat insulating material 73 does not expand, and damage to the support 71 can be prevented.

(Other embodiments)
The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications or expansions are possible.

  In the first embodiment and the second embodiment, the brazing portion 17a of the coupling member 17 is not fixed by brazing before the plate-shaped heating body 7 is assembled, but is brazed after the plate-shaped heating body 7 is assembled. You may make it fix by. Further, the brazed portion 17 a of the coupling member 17 may be locked to the stepped portion 18 instead of being fixed to the stepped portion 18 by brazing.

  In the third embodiment and the fourth embodiment, the coupling member notch portion 57 and the lead wire notch portion 64 are not provided separately, but the portion where the brazing portion 55a of the coupling member 55 is fixed and It is good also as a structure which provides the notch which can accommodate both the parts to which the lead wire 61 was connected. Alternatively, the diameter of the heat insulating material 54 may be smaller than the diameter of the plate-like heating body 51 and the escape means may be provided over the entire circumference of the heat insulating material 54.

You may comprise a heat insulating material by two layers, an upper layer and a lower layer. In this case, it is not necessary to provide the escape means in the lower heat insulating material, and the escape means may be provided only in the upper heat insulating material. Moreover, you may provide a heat insulating material in a some layer further.
The plate-like heating bodies 7 and 51, the heat insulating materials 15 and 54, and the hard heat insulating materials 43 and 73 are not limited to those divided into four parts, and may be further divided into a plurality of pieces or one piece without being divided. You may provide in a disk shape.

The front view which shows the 1st Embodiment of this invention and shows the structure of the periphery of a plate-shaped heating body and a support body Longitudinal front view of induction heating cooker The perspective view which shows a plate-shaped heating body, a heat insulating material, a support body, and an induction heating coil The perspective view for demonstrating the structure of a plate-shaped heating body Functional block diagram showing the electrical configuration of the control system of the induction heating cooker FIG. 1 equivalent diagram showing a second embodiment of the present invention 3 equivalent figure Vertical section showing the periphery of the beam part of the support FIG. 1 equivalent view showing a third embodiment of the present invention 3 equivalent figure 4 equivalent diagram FIG. 1 equivalent view showing a fourth embodiment of the present invention 3 equivalent figure

Explanation of symbols

  In the drawings, 1 is an induction heating cooker, 3 is a top plate, 5 is a cooked appliance, 6 is an induction heating coil, 7 and 51 are plate-like heating bodies, 13, 41, 52 and 71 are support bodies, 54 is a heat insulating material, 17 and 55 are coupling members (coupling means), 17a and 55a are brazing portions (plate-like heating body side coupling portions), 17b and 55b are locking portions (supporting body side coupling portions), and 18 is a stepped portion. , 20 is a heat transfer member (heat transfer layer), 24 and 60 are energization heating elements, 57 is a notch for coupling member (relief means), 64 is a notch for lead wire (relief means), and 61 is a lead wire. Indicates.

Claims (3)

A top plate on which the cooker to be heated is placed;
An induction heating coil that is disposed below the top plate and induction-heats the cooked utensil placed on the top plate;
A plate-like heating body that has an energization heating element that generates heat when energized, and that is disposed between the top plate and the induction heating coil and heats the cooked utensil placed on the top plate;
A support disposed between the plate heating body and the induction heating coil to support the plate heating body ;
A coupling means comprising a coupling member having a plate-like heating body side coupling portion fixed to the edge of the lower surface of the plate-like heating body on the upper side and a support body side coupling portion on the lower side;
A heat insulating material disposed between the plate-like heating body and the support, and having a escaping means capable of accommodating at least a portion where the plate-like heating body side coupling portion is fixed in the plate-like heating body;
With
The plate-like heating body, the support, and the heat insulating material are such that the plate-like heating body-side coupling portion of the coupling member is fixed to the plate-like heating body, and the support-body-side coupling portion is coupled to the support. the unitized, is disposed between the induction heating coil and the top plate at the unitized form,
A lead wire for energizing the energization heating element of the plate-like heating body is connected to the lower surface of the plate-like heating body,
The escape means of the heat insulating material is formed so as to be able to accommodate a portion where the plate-like heating body side coupling portion is fixed including a portion where the lead wire is connected in the plate-like heating body. Induction heating cooker. The induction heating cooker according to claim 1, wherein the coupling member is made of a low permeability metal . The induction heating cooker according to claim 1 or 2 , wherein a heat transfer layer that is in close contact with the top plate and the plate-like heating body is provided between the top plate and the plate-like heating body .

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