JP2017107766A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker including a grill unit with which low-temperature cooking of food can be easily performed.SOLUTION: In an induction heating cooker including a grill unit at the inside thereof, the grill unit includes: a box-shaped heating chamber; a cooking container which is placed on a bottom plate of the heating chamber and made of a magnetic material; and a heating coil arranged under the bottom plate of the heating chamber, subjecting the cooking container, which is placed on the bottom plate of the heating chamber and made of a magnetic material, to induction heating, and cooking food in the cooking container.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an induction heating cooker including a grill unit having a grill cooking function.

  Some conventional induction heating cookers include a grill unit for cooking food such as fish. In this grill unit, heaters are respectively disposed at an upper part and a lower part in a box-shaped heating chamber. A cooking net is provided between the upper and lower heaters and on which the food is placed (see, for example, Patent Document 1).

JP 2007-054221 A

  In the above grill unit, there is a problem that it is difficult to keep the temperature in the heating chamber constant by controlling on / off of the upper and lower heaters, in particular, temperature control during low-temperature cooking is difficult and cooking cannot be performed well. The heating power of the heater is usually controlled by turning on / off the current at which the rated power is supplied to the heater and adjusting the energization ratio. When the current to the heater is turned on / off, the response of the temperature increase / decrease in the heating chamber to the on / off is gradual, so the on time and off time are about several tens of seconds. In particular, when the temperature in the heating chamber is maintained at a relatively low temperature corresponding to low temperature cooking, it is necessary to control the on-time to be short and the off-time to be long, but the temperature in the heating chamber is that the heater is turned on. It rises during the time and falls while the heater is off. Thus, it has been difficult to keep the temperature in the heating chamber constant. Temporarily, it replaces with a grill unit, and it is a heating coil for heating the food accommodated in a cooking container by heating the cooking container mounted on the top plate of an induction heating cooking appliance, and it is low-temperature with respect to food. When cooking, the heating coil on the induction heating cooker side is occupied for a long time, and the usability of the induction heating cooker is not good.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an induction heating cooker including a grill unit that can easily cook a low-temperature food.

  An induction heating cooker according to the present invention is an induction heating cooker provided with a grill unit therein. The grill unit includes a heating chamber, a cooking container made of a magnetic material placed on a bottom plate of the heating chamber, and a heating chamber. A heating coil is provided below the bottom plate and induction-heats the cooking vessel placed on the bottom plate.

  According to the present invention, the grill unit, the magnetic material cooking container placed on the bottom plate of the heating chamber, the heating coil arranged under the bottom plate of the heating chamber, and the bottom plate of the heating chamber, And a heating coil for induction heating the cooking vessel placed on the bottom plate. Thereby, the low temperature cooking or heat insulation cooking by a heating coil can be easily performed compared with the past which performs low temperature cooking or heat insulation cooking with comparatively long cooking time only by heater on / off control. For this reason, the heating coil on the induction heating cooker side is not occupied for a long time, and the space on the top plate can be effectively used, that is, other cooking can be performed with the induction heating cooker. Usability is improved.

It is a perspective view which shows the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the grill unit of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the grill unit of the induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the grill unit of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a perspective view which shows the induction heating cooking appliance which concerns on Embodiment 4 of this invention. It is a block diagram which shows schematic structure of the induction heating cooking appliance of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an induction heating cooker according to the present invention will be described with reference to the drawings. In the respective drawings, the same portions or corresponding portions are denoted by the same reference numerals.
Embodiment 1 FIG.
FIG. 1 is a perspective view showing an induction heating cooker according to Embodiment 1 of the present invention.
The induction heating cooker 100 according to the first embodiment includes a top plate 2 provided at the top of the housing 1, three heating coils disposed in the housing 1, an upper surface operation unit 6, a front operation unit 8, A grill unit 20 or the like installed adjacent to the front operation unit 8 is provided in the housing 1. The top plate 2 includes a non-magnetic crystallized glass plate 3 formed in a quadrilateral shape, and a stainless frame 4 fixed to the front, rear, left and right peripheral portions of the crystallized glass plate 3 with a silicon-based adhesive or the like. It consists of

  On the crystallized glass plate 3 of the top plate 2, a left heating unit 5a, a right heating unit 5b, and a central heating unit 5c indicating the mounting position of a pan or the like are displayed by printing or the like. Three heating coils, that is, a left heating coil, a right heating coil, and a central heating coil are arranged directly below the left heating unit 5a, the right heating unit 5b, and the central heating unit 5c. In addition, in this Embodiment 1, although the induction heating cooking appliance 100 provided with the three heating coils was demonstrated, it is not limited to this. For example, instead of the central heating coil disposed under the central heating unit 5c, a radiation type radial heater may be used. Further, although three heating coils are provided, two or four heating coils may be used.

  In addition, display windows 7a, 7b, and 7c are provided in front of the crystallized glass plate 3 corresponding to the left heating unit 5a, the right heating unit 5b, and the central heating unit 5c, respectively. A liquid crystal display unit is disposed directly below the display windows 7a, 7b, and 7c. The liquid crystal display unit is configured by, for example, an LCD or an organic electroluminescence (EL) element.

  The upper surface operation unit 6 is provided in the frame 4 on the front side of the top plate 2, and includes a heating power selection switch and a cooking start switch for selecting the heating power of the left heating unit 5 a, the right heating unit 5 b, the central heating unit 5 c and the grill unit 20, respectively. A menu selection switch for selecting a cooking menu, a time setting switch for setting a cooking time, and the like. These switches are composed of, for example, electrostatic capacitance type touch switches. The frame 4 on the rear side of the top plate 2 is provided with an intake port 9 and an exhaust port 10.

  The front operation unit 8 is provided on the front surface of the housing 1. The front operation unit 8 includes a power switch 8a for turning on / off the induction heating cooker 100, a heating power adjustment dial 8b, 8c for finely adjusting the heating power of the left heating unit 5a, the right heating unit 5b, and the central heating unit 5c, respectively. 8d, a dial-type cutting timer 8e for setting heating times of the left heating unit 5a, the right heating unit 5b, and the central heating unit 5c is provided. An opening 11 of the grill unit 20 is provided on the front surface of the housing 1. The opening 11 is opened and closed by a grill door 21.

Next, the structure of the grill unit 20 is demonstrated using FIG.1 and FIG.2.
FIG. 2 is a longitudinal sectional view showing the grill unit of the induction heating cooker according to Embodiment 1 of the present invention.
The grill unit 20 includes the grill door 21, the grill body 22, and a cooking vessel 23 formed of a magnetic material. The grill door 21 includes a viewing window 21 a formed of heat-resistant glass (see FIG. 1), a handle portion 21 b that projects toward the front lower end portion of the grill door 21, and a lower end portion on the rear surface of the grill door 21. And a slide rail 21c for moving the grill door 21 in the front-rear direction (see FIG. 1). The aforementioned cooking container 23 is formed in a box shape with an open top. 1 and 2, the shape of the cooking container 23 is simply a box shape, but a handle portion may be provided on one or both of the four side walls on the short side.

  The grill main body 22 is formed of a sheet metal casing 24, and includes a heater 25, a heating coil 27, a magnetic shield 29, and an inverter board 30 in the casing 24. Of the front surface facing the grill door 21, the upper half of the housing 24 is opened as a grill opening 24a, and the lower half is closed by the front surface 24b. The grill opening 24a is formed in a rectangular shape that is long in the left-right direction when the grill unit 20 is viewed from the front. An exhaust duct 24 d extending to the exhaust port 10 of the induction heating cooker 100 is provided on the upper portion of the back surface portion 24 c of the housing 24.

  The casing 24 includes a heating chamber 24e having a bottom plate 26 on which the cooking vessel 23 is placed, and a component storage chamber including a heating coil 27, a magnetic shield 29, and an inverter board 30 below the bottom plate 26. 24f. The bottom plate 26 is formed of, for example, a crystallized glass plate, and the upper surface thereof and the bottom side of the grill opening 24a are on the same plane.

  A heater 25 is disposed in the upper part of the heating chamber 24e. The heater 25 is composed of a sheathed heater or a halogen heater, and generates heat by a current from a heater energizing circuit 41 provided in the induction heating cooker 100. A heating coil 27 is disposed under the bottom plate 26 that forms the upper surface of the component storage chamber 24f. The heating coil 27 is installed in the magnetic shield 29 while being supported on the coil support portion 28. The coil support portion 28 is formed in a disk shape from a heat-resistant resin. The magnetic shield 29 is made of, for example, a nonmagnetic material such as aluminum, and includes a circular bottom 29a and a side wall 29b provided in the circumferential direction on the outer periphery of the bottom 29a.

  The inverter substrate 30 is installed at a position directly below the center of the magnetic shield 29 in the bottom surface portion 24 g of the housing 24, and a lead wire 31 from the heating coil 27 is connected thereto. The inverter board 30 is composed of, for example, an IGBT (Insulated Gate Bipolar Transistor), an inverter circuit 32 that supplies a high-frequency current to the heating coil 27, and a radiation fin (not shown) that radiates heat generated during the operation of the inverter circuit 32. Etc.) is implemented.

  The control circuit 40 shown in FIG. 2 is configured by, for example, a microcomputer, and when cooking the cooked food (excluding fish) contained in the cooking container 23, the power set according to the cooked food is used. The heater energizing circuit 41 is controlled to energize the heater 25 and the inverter circuit 32 is controlled to supply the heating coil 27 with a high-frequency current so as to be cooked. The control circuit 40 corresponds to the control unit of the present invention.

  In addition, when the food to be cooked is grilled fish, the control circuit 40 energizes the heater 25 via the heater energization circuit 41 at the start of cooking, and applies a high-frequency current to the heating coil 27 via the inverter circuit 32, for example. Supply. The control circuit 40 stops the energization of the heater 25 by the heater energization circuit 41 when, for example, a set time of 5 minutes elapses from the start of cooking, that is, energization of the heater 25, and the cooking container in which the fish is accommodated Only the inverter circuit 32 is controlled so that 23 is induction-heated by the heating coil 27. Thereby, it is possible to quickly burn the upper surface of the fish.

  Further, the control circuit 40 controls only the inverter circuit 32 so that the cooking temperature of 80 ° C. or 60 ° C. is maintained in the case of low temperature cooking (eg 80 ° C.) or heat insulation cooking (eg 60 ° C.). A high frequency current is supplied to the heating coil 27. In this case, it is suitable for cooking boiled beans. Compared with the heater on / off control, the heating coil 27 can finely adjust the output by controlling the frequency of the high-frequency current, for example, so that the cooking temperature can be accurately maintained.

As described above, according to the first embodiment, the magnetic material placed on the bottom plate 26 of the heating chamber 24e is mounted on the grill unit 20 in the component storage chamber 24f formed below the bottom plate 26 of the heating chamber 24e. A heating coil 27 for induction heating the cooking vessel 23 is provided.
Thereby, the low temperature cooking or heat insulation cooking in the heating coil 27 can be easily performed as compared with the conventional case where low temperature cooking or heat insulation cooking having a relatively long cooking time is performed only by heater on / off control. For this reason, the heating coil on the induction heating cooker 100 side is not occupied for a long time, and the space on the top plate 2 can be effectively used, that is, other cooking can be performed by the induction heating cooker 100. Usability of the cooking device 100 is improved.

  In addition, by performing low temperature cooking or heat insulation cooking with a relatively long cooking time by the grill unit 20, cooking with a long cooking time on the top plate 2 is eliminated, so that the cooking container 23 such as a pan is turned over during cooking. There is no danger and safety can be improved.

Embodiment 2. FIG.
In the second embodiment, a temperature sensor for detecting the temperature in the heating chamber 24e is provided, and the presence or absence of the lid of the cooking container is detected from the temperature change in the heating chamber 24e detected by the temperature sensor. There will be described below with reference to FIG.
FIG. 3 is a longitudinal sectional view showing a grill unit of an induction heating cooker according to Embodiment 2 of the present invention.

  In the second embodiment, a temperature sensor 42 that is, for example, a thermistor for detecting the temperature in the heating chamber 24e is attached to a position on the heating chamber 24e side of the back surface portion 24c of the housing 24. That is, the temperature sensor 42 passes through the back surface portion 24c of the heating chamber 24e and is attached to the back surface portion 24c. Further, the temperature in the heating chamber 24 e detected by the temperature sensor 42 is input to the control circuit 40. Moreover, the cooking container 23 in the second embodiment has a lid 23 a that covers the upper opening of the cooking container 23. The lid 23a can be detached from the cooking container 23.

  The control circuit 40 supplies a high-frequency current to the heating coil 27 via the inverter circuit 32 at the start of cooking, and the inside of the heating chamber 24e from the start of cooking detected by the temperature sensor 42 until, for example, a set time of 5 minutes elapses. The presence or absence of the lid 23a of the cooking container 23 is detected from the temperature change. The temperature change in the heating chamber 24e is the heat radiation temperature from only the cooking container 23 in the case of the cooking container 23 with the lid 23a, and the heat radiation temperature from the cooking container 23 in the case of the cooking container 23 without the lid 23a. The heating temperature of the food in the cooking container 23 is also added. Therefore, regarding the temperature change in the heating chamber 24e, the temperature of the temperature change with time is smaller in the cooking container 23 with the lid 23a than in the cooking container 23 without the lid 23a. The control circuit 40 detects the presence or absence of the lid 23a based on the temperature change gradient with time, and stores, for example, a predetermined threshold temperature change gradient, and starts cooking detected by the temperature sensor 42. For example, there is a method in which the lid 23a of the cooking container 23 is detected when the gradient of the temperature change in the heating chamber 24e is less than the threshold temperature change gradient until a set time of 5 minutes elapses.

  When detecting the lid 23a of the cooking container 23 from the temperature change, the control circuit 40 continues to supply the high-frequency current to the heating coil 27, and when not detecting the lid 23a of the cooking container 23, the control circuit 40 performs high-frequency to the heating coil 27. In addition to supplying current, the heater 25 is energized via the heater energization circuit 41. This is because in the case of the cooking container 23 without the lid 23a, the food in the cooking container 23 is also heated from above.

  In addition, the control circuit 40 in this Embodiment 2 sets according to the cooking thing when grilling cooking goods (except a fish) accommodated in the cooking container 23 similarly to Embodiment 1. The heater energizing circuit 41 is controlled to energize the heater 25 and the inverter circuit 32 is controlled to supply the heating coil 27 with a high-frequency current so that the cooked electric power is cooked.

  In addition, as in the first embodiment, the control circuit 40 according to the second embodiment has a set time of, for example, 5 minutes from the start of energization of the heater 25 when the food to be cooked is grilled fish. Is passed, the energization of the heater 25 by the heater energization circuit 41 is stopped, and only the inverter circuit 32 is controlled so that the cooking container 23 containing the fish is induction-heated by the heating coil 27.

  Further, the control circuit 40 according to the second embodiment has a cooking temperature of 80 ° C. or 60 ° C. in the case of low temperature cooking (for example, 80 ° C.) or heat insulation cooking (for example, 60 ° C.) as in the first embodiment. Only the inverter circuit 32 is controlled so that the heating coil 27 is supplied with a high-frequency current so as to be maintained.

  As described above, according to the second embodiment, when the lid 23a of the cooking container 23 is detected, the supply of the high-frequency current to the heating coil 27 is continued, and when the lid 23a of the cooking container 23 is not detected, the heating coil In addition to supplying a high-frequency current to 27, the heater 25 is energized via the heater energization circuit 41. Thereby, various cooking, such as stew, can be performed other than cooked products, such as fish. In addition, since cooking such as stew can be cooked by the grill unit 20, other cooking can be performed by the induction heating cooker 100, and the usability of the induction heating cooker 100 is improved.

Embodiment 3 FIG.
In the third embodiment, a recess for storing water is provided at the bottom of the cooking vessel 23 so that the cooking vessel 23 can be used as a steamer. This will be described below with reference to FIG.
FIG. 4 is a longitudinal sectional view showing a grill unit of the induction heating cooker according to Embodiment 3 of the present invention.

  In the third embodiment, as described above, the cooking container 23 is made of a magnetic material and is formed in a box shape having an open top. For example, when viewed from the side of the grill opening 24a of the heating chamber 24e, recesses 23c that are recessed downward from the bottom 23b are provided at both front and rear ends of the bottom 23b. The recess 23c extends to the left and right ends of the bottom 23b when viewed from the grill opening 24a side of the heating chamber 24e.

  In the third embodiment, the recesses 23c are provided at both front and rear ends of the bottom 23b. However, the present invention is not limited to this. For example, when viewed from the side of the grill opening 24a of the heating chamber 24e, recesses 23c that are recessed downward from the bottom 23b may be provided at the left and right ends of the bottom 23b. The recess 23c in this case is formed so as to extend to both front and rear ends of the bottom 23b when viewed from the grill opening 24a side of the heating chamber 24e.

  When the cooking container 23 containing water in the recess 23c is heated in the heating chamber 24e, the heating coil 27 performs induction heating. That is, this cooking container 23 is used as a steamer. For example, when the cooking container 23 is used as a steamer, it can be cooked in a bowl.

  As described above, in Embodiment 3, the cooking vessel 23 can be used as a steamer, so that the cooking range in the grill unit 20 is further expanded, and the induction heating cooker 100 provided with the easy-to-use grill unit 20 is provided. it can.

Embodiment 4 FIG.
FIG. 5 is a perspective view showing an induction heating cooker according to Embodiment 4 of the present invention, and FIG. 6 is a block diagram showing a schematic configuration of the induction heating cooker of FIG.
As described above, the induction heating cooker 100 according to the fourth embodiment includes the left heating coil 51a, below the top plate 2, that is, directly below the left heating unit 5a, the right heating unit 5b, and the central heating unit 5c. A right heating coil 51b (second heating coil) and a center heating coil 51c are arranged. A left inverter circuit 50a, a right inverter circuit 50b, and a central inverter circuit 50c are connected to the left heating coil 51a, the right heating coil 51b, and the central heating coil 51c, respectively.

  In addition to the above-described heating power selection switch 6a, cooking start switch 6b, menu selection switch 6c, and time setting switch 6d, the upper surface operation unit 6 performs one cooking using the right heating coil 51b and the grill unit 20. A combined cooking switch 6e for selecting combined cooking is provided. When the induction heating of the cooking container 60 (see FIG. 5) by the right heating coil 51b is completed in the combined cooking, for example, the control circuit 40 informs the control circuit 40 of the same and the same cooking container 60 in the heating chamber 24e of the grill unit 20. An informing unit 52 for informing by voice or sound that prompts the user to set the device is connected.

  The control circuit 40 controls the right inverter circuit 50b so that the high-frequency current is supplied to the right heating coil 51b when the composite cooking switch 6e of the upper surface operation unit 6 is operated, thereby inductively heating the cooking container 60. When cooking of the food in the cooking container 60 in the right heating coil 51b is completed, the control circuit 40 transmits a sound to the effect that the same cooking container 60 is set in the heating chamber 24e of the grill unit 20 through the notification unit 52. Or notify by sound. Then, the control circuit 40 supplies a high-frequency current to the heating coil 27 of the grill unit 20 to inductively heat the same cooking container 60 accommodated in the heating chamber 24e, and continues cooking the food in the cooking container 60. Do.

  As described above, according to the fourth embodiment, when the composite cooking switch 6e of the upper surface operation unit 6 is operated, the high-frequency current is supplied to the right heating coil 51b to induce the cooking container 60 on the top plate 2. After heating, a high-frequency current is supplied to the heating coil 27 of the grill unit 20 to inductively heat the same cooking vessel 60. Thereby, the interlocking cooking of a cooking item can be performed and the usability of the induction heating cooking appliance 100 and the improvement of cooking performance can be aimed at.

  In the fourth embodiment, the cooking container 60 is first induction-heated by the right heating coil 51b and then the same cooking container 60 is induction-heated by the heating coil 27 of the grill unit 20. However, the present invention is not limited to this. Is not to be done. For example, first, the cooking container 60 may be induction-heated with the left heating coil 51a (second heating coil) instead of the right heating coil 51b, or the heater may be replaced with the heating coil 27 of the grill unit 20. 25, the same cooking container 60 may be heated. Further, the same cooking container 60 may be heated by the heating coil 27 and the heater 25.

  1 housing, 2 top plate, 3 crystallized glass plate, 4 frame, 5a left heating unit, 5b right heating unit, 5c central heating unit, 6 upper surface operation unit, 6a thermal power selection switch, 6b cooking start switch, 6c menu Selection switch, 6d Time setting switch, 6e Combined cooking switch, 7a, 7b, 7c Display window, 8 Front operation unit, 8a Power switch, 8b, 8c, 8d Thermal power adjustment dial, 8e Dial-type cut-off timer, 9 Inlet, 10 Exhaust port, 11 opening, 20 grill unit, 21 grill door, 21a viewing window, 21b handle, 21c sliding rail, 22 grill body, 23 cooking container, 23a lid, 23b bottom, 23c recess, 24 housing, 24a Grill opening, 24b Front part, 24c Rear part, 24d Exhaust duct, 24e Heating chamber, 24 Component storage room, 24g Bottom face part, 25 Heater, 26 Bottom plate, 27 Heating coil, 28 Coil support part, 29 Magnetic shield, 29a Bottom part, 29b Side wall part, 30 Inverter board, 31 Lead wire, 32 Inverter circuit, 40 Control circuit, 41 heater energization circuit, 42 temperature sensor, 50a left inverter circuit, 50b right inverter circuit, 50c central inverter circuit, 51a left heating coil, 51b right heating coil, 51c central heating coil, 52 notification section, 60 cooking vessel, 100 induction heating Cooking device.

Claims (6)

In induction heating cooker with a grill unit inside,
The grill unit is
A heating chamber;
A magnetic material cooking container placed on the bottom plate of the heating chamber;
An induction heating cooker, comprising: a heating coil that is disposed below the bottom plate of the heating chamber and that induction-heats the cooking vessel placed on the bottom plate. The grill unit has a heater disposed in an upper part of the heating chamber,
2. A control unit for energizing the heater, supplying a high-frequency current to the heating coil, and stopping energization of the heater when a set time has elapsed from the start of energization of the heater. The induction heating cooker according to 1. The cooking container has a lid that covers the upper opening of the cooking container,
The grill unit has a temperature sensor for detecting the temperature in the heating chamber,
A control unit is provided that supplies a high-frequency current to the heating coil at the start of cooking and detects the presence or absence of a lid of the cooking container from a temperature change in the heating chamber from the start of cooking detected by the temperature sensor until a set time has elapsed. The induction heating cooker according to claim 1 or 2, characterized in that. The grill unit has a heater disposed in an upper part of the heating chamber,
When the controller detects the lid of the cooking container, it continues to supply the high-frequency current to the heating coil, and when it does not detect the lid of the cooking container, in addition to supplying the high-frequency current to the heating coil, The induction heating cooker according to claim 3, wherein the heater is energized.   The induction heating cooker according to any one of claims 1 to 4, wherein a recess for storing water is provided at the bottom of the cooking container. A top plate provided at the top of the housing;
A second heating coil disposed under the top plate;
An operation unit having a combined cooking switch for selecting combined cooking for performing one cooking using the heating coil and the grill unit;
When the combined cooking switch of the operation unit is operated, the control unit supplies a high-frequency current to the second heating coil to inductively heat the cooking vessel placed on the top plate, and then The induction heating cooker according to any one of claims 2 to 5, wherein a high-frequency current is supplied to a heating coil of the grill unit to induction-heat the same cooking vessel.

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