JP2001267053A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat response and to control correctly. SOLUTION: A temperature detecting means 23 is provided at a heat collecting board 22 which is structured by a nonmagnetic material inserted into a top plate 25, an electric power to supply a heating coil 21 with is controlled in accordance with the power of the temperature detecting means 23, and also a thermal insulation means 26 is provided at an undersurface of the heat collecting board 22. The board 22 prevents heat dissipation from a cooking container 20, thus, an induction heating cooker which can control the temperature correctly is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used in ordinary households.

[0002]

2. Description of the Related Art A conventional induction heating cooker is described, for example, in Japanese Patent Laid-Open No. 6-302378. This structure will be described with reference to FIG.

A top plate 2 made of a non-magnetic material is mounted on the upper surface of the main body 1. On the upper surface of the top plate 2, a cooking container 4 is placed. Cooking container 4
Is a heating coil 3 provided below the top plate 2.
Is heated by the In other words, when a high-frequency current is supplied to the heating coil 3 by the control means 7, the heating coil 3 generates a high-frequency magnetic field, and this high-frequency magnetic field links with the cooking vessel 4, and the cooking vessel 4 itself generates heat by induction heating. It is. Therefore, the food stored in the cooking container 4 is heated by the heat generated by the cooking container 4, and the cooking proceeds. At this time, the control means 7 adjusts the power supplied to the heating coil 3 based on the temperature signal detected by the temperature detection means 6 to control the temperature of the food. At this time, in the technique disclosed in this document, accurate temperature control is performed by attaching the temperature detecting means 6 to the temperature sensing plate 5. The temperature sensing plate 5 is made of a non-magnetic material, and is attached to the lower surface of the top plate 2.

[0004]

In the induction heating cooker of the above-mentioned conventional construction, the heat plate receives the amount of heat of the cooking vessel through the top pool and detects the temperature of the heat plate. And has a problem that the thermal response is low. That is, since the top plate is made of ceramic and has a low thermal conductivity, the heat transfer to the temperature-sensitive plate is delayed as described above.

[0005]

According to the present invention, a heat collecting plate made of a nonmagnetic material is provided in a top plate and provided with temperature detecting means, and the temperature is supplied to a heating coil in accordance with the output of the temperature detecting means. An induction heating cooker that controls electric power and has a heat insulating plate provided on the lower surface of the heat collecting plate to prevent the heat collecting plate from radiating heat from the cooking vessel, thereby enabling accurate temperature control.

[0006]

According to the first aspect of the present invention, a heat detecting plate is provided on a heat collecting plate made of a non-magnetic material and fitted into a top plate, and a heating coil is provided in accordance with an output of the temperature detecting unit. An induction heating cooker that controls the power supplied to the heat collecting plate and provides an insulating plate on the lower surface of the heat collecting plate to prevent the heat collecting plate from radiating heat from the cooking vessel, thereby enabling accurate temperature control.

According to a second aspect of the present invention, the heat collecting plate is provided with a heat insulating plate provided between the heat collecting plate and a side surface of the heat collecting plate to prevent the amount of heat collected from being released to the top plate. Can measure the temperature of the cooking vessel with high accuracy,
The induction heating cooker is capable of accurate temperature control.

According to a third aspect of the present invention, a cooling air shielding means is provided on the lower surface of the heat collecting plate to prevent the heat collecting plate from being cooled by the cooling air for cooling the heating coil, thereby achieving high precision. It is an induction heating cooker that can measure the temperature of the cooking vessel and can accurately control the temperature.

According to a fourth aspect of the present invention, the temperature sensing plate is formed in a ring shape to collect heat in a high-temperature portion of the cooking vessel so that the temperature of the cooking vessel can be measured with high accuracy and accurate temperature control can be performed. It is a heating cooker.

According to a fifth aspect of the present invention, the heat collecting plate is constituted by a central heat collecting portion constituting the central portion and a ring-shaped outer peripheral heat collecting portion constituting the outer peripheral portion, each of which is provided with a temperature sensor. By providing means, an induction heating cooker capable of accurately measuring the temperature and controlling the temperature accurately even if the bottom surface of the cooking container is warped is provided.

[0011] According to a sixth aspect of the present invention, in the heat collecting plate, the surface on which the cooking vessel is placed is made black, the radiant heat radiated from the cooking vessel is efficiently collected, and the cooking vessel is deformed. Even so, it is an induction heating cooker that can accurately control the temperature.

[0012]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a sectional view showing the configuration of the present embodiment. The induction heating cooker according to the present embodiment includes a top plate 25 on which the cooking container 20 is placed, a heating coil 21 provided below the top plate 25, and a control unit 24 for supplying a high-frequency current to the heating coil 21; A temperature detector 23 for transmitting temperature information of the cooking container 20 to the controller 24 is provided. The temperature detecting means 23 is constituted by a thermistor. The control means 24 includes the temperature detection means 23
The magnitude of the high-frequency current supplied to the heating coil 21 is adjusted according to the temperature information, or the power supplied to the heating coil 21 is controlled.

The temperature detecting means 23 is provided on a heat collecting plate 22 made of a non-magnetic material and fitted inside the top plate 25 so that the top surface is flat. As the heat collecting plate, for example, a material having high thermal conductivity such as aluminum nitride is used, but alumina, silicon, or the like can also be used. The material is not limited to a single material. For example, a metal powder dispersed in ceramic,
Alternatively, a material in which metal powder is dispersed in an insulator can be used. In this embodiment, a heat insulating means 26 is provided on the lower surface of the heat collecting plate 22. As the heat insulating means 26, a so-called vacuum heat insulating material or a plastic resin having high heat resistance can be used. Of course, the heat insulating means 26 is a non-magnetic material.

The operation of this embodiment will be described below.
When a power supply (not shown) is turned on and a predetermined temperature is set by an operation switch, the control unit 24 supplies electric power to the heating coil 21. When electric power is supplied to the heating coil 21, an induction magnetic field is generated from the heating coil 21, and the cooking container 20 on the top plate 25 is induction-heated. Due to this induction heating, the temperature of the cooking container 20 rises, and the object to be heated in the cooking container 20 is cooked. At this time, the control means 24
The progress of the cooking of the object to be heated can be grasped from the temperature information from the temperature detecting means 23, and the power supplied to the heating coil 21 is adjusted according to the progress of the cooking. Thus, the object to be cooked in the cooking container 20 is to be cooked.

At this time, in this embodiment, the temperature information of the temperature detecting means 23 provided on the heat collecting plate 22 is received. The heat collecting plate 22 has a configuration in which the top surface is flattened inside the top plate 25 as described above. That is, the top plate 25 has a circular hole so that the temperature sensing plate 22 is fitted therein, and the temperature sensing plate 22 is fitted into this hole. At this time, as described above, the heat collecting plate 22 is provided flat so that the top surface thereof is flush with the top plate 25, and the cooking container 20 has the bottom surface formed of the heat collecting plate 22.
It is placed in close contact with the top surface of the camera. Therefore,
The heat collecting plate 22 can efficiently collect heat generated by the cooking container 22 from the bottom surface of the cooking container 20. At this time, a heat insulating means 26 is provided on the bottom surface of the heat collecting plate 22. For this reason, the heat collecting plate 22 has a heating coil 2 which is a heat generating portion provided below the top plate 22.
2, which is not affected by the heat generation. That is, the heat collecting plate 22 can directly contact the cooking container 20 and collect heat generated by the cooking container 22. Therefore, the temperature detecting means 2 provided on the heat collecting plate 22
Numeral 3 can accurately detect the temperature of the cooking container 22.

Accordingly, the temperature information from the temperature detecting means 23 received by the control means 24 of the present embodiment accurately captures a change in the temperature of the cooking vessel 20. For this reason, the power control of the heating coil 21 by the control unit 24 is also adapted to the temperature change of the cooking container 20 immediately.

As described above, according to this embodiment, the top plate 25 made of a non-magnetic material on which the cooking container 20 is placed is placed.
A heat collecting plate 22 for collecting heat from a cooking container made of a non-magnetic material fitted into the top plate 25 so that the top surface is flat; and a temperature detecting means 24 provided on the heat collecting plate 22. Control means 24 for controlling the power supplied to the heating coil 21 provided below the top plate 25 in accordance with the output of the temperature detecting means 24; and a heat insulating plate 26 provided on the lower surface of the heat collecting plate 22. As a configuration in which the radiant heat received by the heat collecting plate 22 from the heating coil 21 is reduced, an induction heating cooker capable of performing accurate temperature control is realized.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 2 is a cross-sectional view illustrating the configuration of the present embodiment. In the present embodiment, a heat insulating plate 27 is provided in addition to the configuration described in the first embodiment. Insulation board 27
Is formed of a non-magnetic vacuum heat insulating material or a highly heat-resistant plastic resin, like the heat insulating means 26, and is formed on the side surface of the heat collecting plate 22 so as to fill the space between the heat collecting plate 22 and the top plate 25. It is what is arranged.

With the above configuration, the amount of heat collected by the heat collecting plate 22 from the bottom surface of the cooking container 20 is not radiated to the top plate 25 from the side surface of the heat collecting plate 22. That is, heat radiation to the top plate 25 is prevented by the heat insulating means 27. For this reason, the temperature detected by the temperature detecting means 23 depends on the cooking container 20.
Is a value that indicates the bottom surface temperature more accurately. That is, the power control of the heating coil 21 by the control means 24 is more accurate.

As described above, according to the present embodiment, the heat collecting plate 2
2 has a configuration in which a heat insulating plate 27 provided between the side surface of the heat collecting plate 22 and the top plate 25 prevents the amount of collected heat from being released to the top plate 25, and thus allows accurate temperature control. This realizes an induction heating cooker.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 3 is a cross-sectional view illustrating the configuration of the present embodiment. In the present embodiment, a cooling air blocking means 28 is provided on the lower surface of the heat collecting plate 22. The cooling air cutoff means 28 is made of a non-magnetic material and has a function of shielding cooling air for cooling the heating coil 21. At this time, in the present embodiment, the heat insulating plate 26 is not provided with the heat insulating means 26 described in the first or second embodiment on the bottom surface of the heat collecting plate 22, but there is no problem even if the heat insulating plate 26 is provided. Things.

The heating coil 21 is a heat-generating component that becomes hot during use of the apparatus. Therefore, during use of the apparatus, it is necessary to cool it by a cooling fan (not shown). At this time, the cooling fan cools not only the heating coil 21 but also the power element and the like built in the control means 25 at the same time. In the present embodiment, the cooling air from the cooling fan is prevented from contacting the heat collecting plate 22. That is, the heat quantity of the cooking container 20 from which the heat collecting plate 22 has collected heat is prevented from being radiated by the cooling air.

As described above, according to the present embodiment, the top plate 25 made of a non-magnetic material on which the cooking container 20 is placed is placed.
A heat collecting plate 22 for collecting heat of a cooking vessel made of a non-magnetic material fitted into the top plate 25 so that the top surface is flat; and a temperature detecting means 23 provided on the heat collecting plate 22. Control means 24 for controlling the power supplied to the heating coil 21 provided below the top plate 25 in accordance with the output of the temperature detecting means 23; and heating coil 21 provided on the lower surface of the heat collecting plate 22. A configuration in which a cooling air shielding means 28 for shielding cooling air for cooling is provided, and the heat collecting plate 22 is prevented from being cooled by the cooling air, thereby realizing an induction heating cooker capable of performing accurate temperature control. It is.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. FIG. 4 is a plan view illustrating the configuration of the present embodiment. In this embodiment, the heat collecting plate 22 is formed in a ring shape, and has the same central axis as the heating coil 21 (not shown).

The operation of this embodiment will be described below.
FIG. 5 is an explanatory diagram illustrating the power density of the power supplied to the cooking container 20 (not shown). Top plate 2
The cooking container 20 placed on the heater 5 is heated by the induction power supplied from the heating coil 21. At this time, the induction power supplied to the cooking container 20 is supplied such that the position of about half the radius of the heating coil 21 has a peak as shown in FIG. Therefore, the heat generation of the cooking container 20 also
The heat distribution is in accordance with the power density. That is, the position where the power density is high is the high temperature portion of the cooking container 20. The heat collecting plate 22 of the present embodiment includes:
As described above, it is arranged in a ring shape at a position where the center axis of the heating coil 21 is the same as that of the heating coil 21. That is, when the heat collecting plate 22 of the present embodiment is used, the cooking container 22
The heat of the high temperature part can be reliably collected. Also,
The user sets the mounting position of the cooking container 20 on the top plate 25.
The cooking container 20 can be in contact with the ring-shaped heat collecting plate 22 even at a position shifted from the center of the heat collecting plate 2.
Numeral 2 can reliably collect the heat generated by the cooking container 20.

That is, according to the present embodiment, the highest temperature of the cooking container 20 can be detected, and the control means 24 can execute the accurate temperature. Therefore, even if the stewed dish is executed, the cooking container 20 may be scorched. Thus, it is possible to realize an induction heating cooker that can perform accurate temperature control without any problem.

Embodiment 5 Next, a fifth embodiment of the present invention will be described. FIG. 6 is a plan view showing the configuration of the present embodiment. In the present embodiment, the heat collecting plate 22 is constituted by a central heat collecting portion 29 forming a central portion and a ring-shaped outer heat collecting portion 30 forming an outer circumferential portion. Further, the temperature detecting means 23a is disposed in the central heat collecting section 29, and the temperature detecting means 23b is disposed in the outer peripheral heat collecting section 30. The temperature information detected by the temperature detecting unit 23a and the temperature detecting unit 23b is transmitted to the control unit 24 described in each embodiment.

Hereinafter, the operation of this embodiment will be described. The central heat collecting section 29 collects heat of the central part of the cooking container 20. The temperature detecting means 23a therefore detects the temperature at the center of the cooking vessel 20 and transmits this signal to the control means 24. In addition, the outer peripheral heat collecting unit 30 collects heat of the outer peripheral part of the cooking container 20. The temperature detecting means 23b detects the temperature of the outer peripheral portion of the cooking container 20 and transmits this signal to the control means 24. Therefore, the control means 24 controls the cooking container 2
It is possible to recognize both the temperature at the center of 0 and the temperature at the outer periphery of the cooking container 20. That is, when the shape of the bottom surface of the cooking container 20 is warped and only the central portion of the cooking container 20 is in contact with the central heat collecting portion 29, or the central portion of the cooking container 20 is raised, Even in the case where only the peripheral portion is in contact with the outer peripheral heat collecting portion 30, accurate temperature control can be performed.

In this embodiment, one temperature detecting means 23b is provided in the outer peripheral heat collecting section 30, but when a plurality of temperature detecting means 23b are used, more accurate temperature detection is performed. Is what you can do.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described. In this embodiment, the upper surface of the heat collecting plate 22 described in each embodiment, that is, the surface on which the cooking container 20 is placed is black. Since blackening requires heat resistance, a silicon-based inorganic paint is used.

The operation of this embodiment will be described below. When the bottom surface of the cooking container 20 is warped, the heat collecting plate 22 may be in contact with only a part of the cooking container. In such a case, naturally, the heat generated by the cooking vessel is hardly transmitted to the heat collecting plate 22. In this regard, in this embodiment, since the upper surface of the heat collecting plate 22 is black, the heat collecting plate 22 is
It is easy to absorb radiant heat. Therefore, according to the present embodiment, even when the cooking container 20 is deformed,
The temperature of the cooking container can be accurately detected, and accurate temperature control can be performed.

[0032]

According to the first aspect of the present invention, there is provided a top plate made of a non-magnetic material on which a cooking container is placed, and a non-magnetic material fitted inside the top plate so that a top surface is flat. A heat collecting plate for collecting heat of the configured cooking container, a temperature detecting means provided on the heat collecting plate, and an electric power supplied to a heating coil provided at a lower portion of the top plate according to an output of the temperature detecting means. An induction heating cooker that includes a control means for controlling and a heat insulating plate provided on a lower surface of the heat collecting plate, wherein the heat collecting plate prevents heat radiation of the cooking vessel, thereby enabling accurate temperature control. Things.

According to a second aspect of the present invention, the heat collecting plate is provided with a heat insulating plate provided on a side surface of the heat collecting plate between the heat collecting plate and the top plate so as to prevent the amount of heat collected from being released to the top plate. Thus, an induction heating cooker capable of performing accurate temperature control is realized.

According to a third aspect of the present invention, a top plate made of a non-magnetic material on which a cooking container is placed is constructed, and a non-magnetic material fitted inside the top plate so as to have a flat top surface. A heat collecting plate for collecting heat from the cooking vessel,
Temperature detecting means provided on the heat collecting plate, control means for controlling power supplied to a heating coil provided below the top plate according to the output of the temperature detecting means, and provided on the lower surface of the heat collecting plate An induction heating cooker that includes a cooling air shielding unit that shields a cooling air for cooling a heating coil and that prevents the heat collecting plate from being cooled by the cooling air is realized. Things.

The invention described in claim 4 realizes an induction heating cooker in which the heat collecting plate is formed in a ring shape and can perform accurate temperature control.

According to a fifth aspect of the present invention, the heat collecting plate is constituted by a central heat collecting portion constituting a central portion and a ring-shaped outer peripheral heat collecting portion constituting an outer peripheral portion, and each of them has a temperature detector. As a configuration provided with the means, an induction heating cooker capable of performing accurate temperature control even when the cooking container is deformed is realized.

According to a sixth aspect of the present invention, the heat collecting plate has a configuration in which the surface on which the cooking container is placed is black, and the induction heating cooker can perform accurate temperature control even if the cooking container is deformed. Is realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of an induction heating cooker according to a second embodiment.

FIG. 3 is a sectional view showing the configuration of an induction heating cooker according to a third embodiment of the present invention;

FIG. 4 is a plan view illustrating the shape of a heat collecting plate used in an induction heating cooker according to a fourth embodiment.

FIG. 5 is an explanatory diagram illustrating a distribution of induction heating power supplied to the cooking container.

FIG. 6 is a plan view illustrating a shape of a heat collecting plate used in an induction heating cooker according to a fifth embodiment.

FIG. 7 is a cross-sectional view showing a configuration of a conventional induction heating cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Cooking container 21 Heating coil 22 Heat collecting plate 23 Temperature detecting means 24 Control means 25 Top plate 26 Insulating means 27 Insulating means 28 Cooling air cutoff means 29 Central heat collecting part 30 Outer peripheral heat collecting part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Izumi Hirota 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Takahiro Miyauchi 1006 Odaka Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co. (72) Inventor Yu Fukuda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 3K051 AA08 AB02 AB09 AC33 AD04 AD12 AD29 CD02 CD43

Claims (6)

[Claims] 1. A top plate made of a non-magnetic material,
A heat collecting plate for collecting heat of a cooking vessel made of a non-magnetic material fitted so that the top surface is flat inside the top plate, a temperature detecting unit provided on the heat collecting plate, and a temperature detecting unit. Control means for controlling the power supplied to the heating coil provided below the top plate according to the output, and a heat insulating plate provided on the lower surface of the heat collecting plate, wherein the heat collecting plate from the cooking vessel Induction heating cooker to prevent heat radiation. 2. The heat collecting plate according to claim 1, wherein the heat collecting plate is provided with a heat insulating plate provided on a side surface of the heat collecting plate between the heat collecting plate and the top plate so as to prevent heat radiation from the collected heat to the top plate. Induction heating cooker. 3. A heat collecting means for collecting heat from a top plate made of a non-magnetic material on which a cooking container is placed and a cooking container made of a non-magnetic material fitted inside the top plate so that a top surface is flat. A heat collecting plate, a temperature detecting means provided on the heat collecting plate, a control means for controlling electric power supplied to a heating coil provided below the top plate according to an output of the temperature detecting means, An induction heating cooker comprising cooling air shielding means for shielding cooling air for cooling a heating coil provided on a lower surface of the plate, and preventing the heat collecting plate from being cooled by the cooling air. 4. The induction heating cooker according to claim 1, wherein the heat collecting plate has a ring shape. 5. A heat collecting plate comprising a central heat collecting portion constituting a central portion and a ring-shaped outer peripheral heat collecting portion constituting an outer peripheral portion, each provided with a temperature detecting means. Or, the induction heating cooker according to 2 or 4. 6. The induction heating cooker according to claim 1, wherein the heat collecting plate has a black surface on which the cooking vessel is placed.