KR100831458B1 - Heating cooker - Google Patents

Abstract

The present invention provides a heating cooker capable of more efficiently heating a cooking vessel made of a material having a low permeability.

The heating cooker is equipped with an induction heating coil 6 and an infrared heater 19, and the thermal power control device determines the material of the cooking vessel 8, and controls the inverter and the heating element energizing part according to the determined material to control the induction heating coil. The heating rate by (6) and the infrared heater 19 is controlled. And the temperature detection means 11 is arrange | positioned inside the ring-shaped infrared heater 19, and the infrared heater support member 17 has the side wall 17a radiate | emitted from the infrared heater 19 temperature detection It is configured to prevent the corresponding to the means (11).

Induction heating coil, infrared heater, cooking vessel, infrared heater support member, side wall

Description

Heated Cooker {HEATING COOKER}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view of a first embodiment of the present invention, in which a part of a heating cooker is terminated.

FIG. 2 is an enlarged view of one loading part side in FIG. 1; FIG.

3 is a functional block diagram showing the configuration of a control system;

Fig. 4 is a flowchart showing the control contents by the thermal power control device for the parts related to the gist of the present invention.

Fig. 5A is a diagram showing the relationship between the input current ip and the coil current ic according to the material of the cooking vessel, and Fig. 5B is an equivalent circuit diagram of the induction heating coil.

Fig. 6 is a diagram for explaining the difference between the degree of temperature rise from the start of heating in the case where the cooking vessel is a nonmetallic material and no load.

Fig. 7 is a diagram corresponding to Fig. 2 showing a second embodiment of the present invention.

Fig. 8 is a diagram corresponding to Fig. 2 showing a third embodiment of the present invention.

9 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention.

Fig. 10 is a view corresponding to Fig. 2 showing the fifth embodiment of the present invention.

Figure 11 corresponds to Figure 4 showing the sixth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: housing

3: upper plate

6, 7: induction heating coil

8: cooking vessel

11, 12: temperature detection means

17, 18: infrared heater support member

19, 20: infrared heater

21: thermal control device

22: control panel

24: inverter

28: heating element energization control unit

31: induction heating coil

32: infrared heater support member

33a, 33b: infrared heater

34: infrared heater support member

35: infrared ribbon heater

36, 37: induction heating coil

38: infrared heater support member

39: infrared heater

40: induction heating coil

41: infrared heater

60 to 64: heating unit

[Document 1] Japanese Unexamined Patent Application Publication No. 61-230289

[Document 2] Japanese Patent No. 3457512

The present invention provides a heating unit having an induction heating coil and an infrared ray heater for heating a cooking vessel loaded on a top-plate constituting an upper surface of a housing. It relates to a heating cooker having a.

In an induction heating cooker, a problem is how to heat a cooking vessel made of a material having high electrical conductivity at low permeability such as aluminum or copper pot. As a prior art for solving this problem, Patent Literature 1 discloses a configuration for detecting floating or moving of a pot due to the repulsive force generated when induction heating is performed, and limiting the current supplied to the induction heating coil. In addition, Patent Literature 2 discloses a configuration in which an aluminum plate is inserted between an induction heating coil and a pan, and the pan is indirectly heated by induction heating of the aluminum plate.

[Patent Document 1] Japanese Patent Application Laid-Open No. 61-230289

[Patent Document 2] Japanese Patent No. 3465712

In the technique disclosed in Patent Literature 1, since the weight of the pot is light, when the repulsive force is difficult to be suppressed, the supply of the current is greatly limited, and as a result, the thermal power is lowered, so that sufficient heating cooking cannot be performed.

Moreover, in the technique disclosed by patent document 2, since a pot is heated indirectly through an aluminum plate, heating efficiency falls. That is, the aluminum plate is induction heated like a pot, but all its power is supplied through an induction heating device constituted by an inverter and an induction heating coil. Therefore, the power supplied to a switching element such as an IGBT constituting an inverter, a resonant capacitor, a smoothing capacitor, an inductor, or the like becomes large, and the size of such an element becomes large and expensive. In addition, the coil cross-sectional area of the induction heating coil cannot be increased, and the entire induction heating apparatus is enlarged.

In addition, when heating an aluminum pan, a pan moves by the repulsive force by the magnetic flux of an induction heating coil as mentioned above. In order to suppress this movement, it is necessary to raise the frequency of the electric current which flows through an induction heating coil, and the loss by the skin effect becomes large. In order to suppress the loss due to the skin effect, the induction heating coil needs to be composed of a very thin line of, for example, about 50 µ, and a litz wire twisted at 1000 or more as a 2 kW output. When the aluminum plate is also heated as in Patent Literature 2, the current flowing through the induction heating coil becomes larger, so that the number of very thin wires constituting the litz wire is required more and cannot be expensive.

In addition, since aluminum is a nonmagnetic material and has a low permeability, the leakage magnetic flux of the induction heating coil becomes large, the number of turns of the coil increases, and the voltage of the coil increases. As a result, a high voltage is applied to the human body through the pot by the capacitance between the pot and the induction heating coil, so that a high frequency current may flow. In order to prevent such a situation, it is necessary to insert a shielding plate between the induction heating coil and the upper plate and connect it to the ground, which leads to a problem of more complicated structure.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heating cooker capable of more efficiently heating a cooking vessel made of a material having a low permeability.

The heating cooker of the present invention comprises a housing, an upper surface of the housing, an upper plate on which a cooking vessel is loaded, an induction heating coil configured to improve heating efficiency when the cooking vessel is a high resistance material, and an infrared ray. And a heating unit configured to heat the cooking vessel so as to be heatable by the at least one side, and disposed inside the loop formed by the infrared heater, the temperature for detecting the temperature of the cooking vessel. High frequency current which supplies a high frequency current to a detection means, the shielding member which prevents the infrared radiation radiated by the said infrared heater correspond to the said temperature detection means, between this temperature detection means and the said infrared heater, and the said induction heating coil. Supply means, energization means for energizing the infrared heater to generate heat, and It is comprised by the heating control means which controls the heating to the said cooking container by controlling the electric power supplied to each of a high frequency electric current supply means and the said electricity supply means.

If comprised in this way, even if the material of a cooking container differs in various ways, it becomes possible to heat by at least one of an induction heating coil and an infrared heater. In the case of a material having low heating efficiency in induction heating, an infrared heater may be used to heat the induction heating coil. Thus, the induction heating coil can be configured to have a good heating efficiency in the case of a high resistance material, thereby improving the induction heating efficiency. . In addition, since the temperature detection means is disposed inside the loop formed by the infrared heater and the shielding member prevents the infrared radiation radiated from the infrared heater corresponding to the temperature detection means, the cooking vessel in the case of facing radiant heating. Temperature detection can be performed with high accuracy.

In addition, the appearance of "loop" here is not limited to a ring shape, For example, it may be an ellipse shape, a rectangular shape, etc. In addition, that the temperature detection means is "arranged inside the loop which an infrared heater makes" means that it is located inside in the planar positional relationship when it sees from the upper side of an upper plate, and is necessarily the height direction of both. This does not mean that the position in the coincidence coincides.

(First embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 is a front view showing a part of the heating cooker 1 in a vertical manner. The outer cover of the heating cooker 1 is the housing 2, and the upper plate 3 is located above this, and comprises the upper surface of the housing. The induction heating coils 6 and 7 are disposed in the housing 2 just below the mounting portions 4 and 5 of the upper plate 3, whereby the loading portions 4 and 5 are provided. The cooking vessels 8 (refer to FIG. 2) to be loaded are inductively heated, respectively. 2 is an enlarged view of a portion of the stacking portion 4 in FIG.

On the front face of the housing 2, a control panel 9 and a roster door 10 are provided, of which the control panel 9 is provided to the induction heating coils 6 and 7. The user can perform the operation, and an oven (not shown) is continuous inside the housing 2 at the rear of the roaster door 10. The temperature detection means 11 and 12 which consist of a thermistor etc. are provided in the lower surface of the upper plate 3 especially at the position just below the center of the said loading parts 4 and 5. The induction heating coils 6 and 7 are supported by the induction heating coil support members 13 and 14, and the induction heating coils 6 and 7 are provided on the lower surface side of the induction heating coil support members 13 and 14. Ferrites 15 and 16 for forming a magnetic path of the magnetic flux are arranged.

As shown in Fig. 2, the induction heating coils 6 and 7 are wound in two stages at the same time and are divided into two. That is, each is composed of inner circumferential side coils 6a, 7a located on the inner circumferential side with a small diameter and outer circumferential side coils 6b, 7b located on the outer circumferential side with a large diameter. And between the inner circumferential side coils 6a and 6b and between the outer circumferential side coils 7a and 7b, the infrared heater support members 17 and 18 which form ring shape of substantially W shape are respectively arrange | positioned, Infrared heaters 19a, 19b, 20a, and 20b in a ring shape (loop shape) are disposed in the infrared heater support members 17 and 18.

The side walls 17a and 18a of the infrared heater support members 17 and 18 serve to act as a barrier to prevent the infrared radiation radiated from the infrared heaters 19a, 19b, 20a and 20b from corresponding to the temperature detection means 11 and 12. The height is determined and formed. In detail, the side walls 17a and 18a are set to the height which cuts off the outer edge of the infrared heater 19a, 19b, 20a, 20b, and the straight line which connects the upper end part of the temperature detection means 11, 12. As shown in FIG.

That is, the induction heating coils 6 and 7 and the infrared heaters 19a, 19b, 20a, and 20b are arranged so as to face the lower surface of either upper plate 3. Moreover, the glass of favorable transmittance is selected for the material of the upper plate 3 in the near-infrared region (wavelength 0.8 micrometer-4 micrometers) radiated | emitted from infrared heaters 19a, 19b, 20a, and 20b.

3 is a functional block diagram showing the configuration of the control system. The thermal power control device (heating control means and material determination means) 21 is provided inside the housing 2 and is constituted by a microcomputer. The operation signal is input from the operation part 22 arrange | positioned at the operation panel 19 to the thermal power control apparatus 21, and the temperature detection signal is input from the temperature detection means 11 and 12. FIG. And the thermal power control apparatus 21 controls the operation | movement of the display part 23 arrange | positioned at the operation panel 19 based on such an input and the control program memorize | stored in advance, and supplies an inverter (high frequency current supply). The means 24 are controlled, and a high frequency current is supplied to the induction heating coils 6 (and 7) via the inverter 24 to control them.

In addition, a resonant capacitor 25 is connected in series to the induction heating coil 6. The induction heating coil 6 or the resonant capacitor 25 is adjusted so that the efficiency of induction heating becomes good when the material of the cooking vessel 8 is a high resistance (high permeability) material such as iron. Here, "high resistance" means that resistance is high, when the material is aluminum as a reference | standard (for example, the thickness of a pot bottom is about 1 mm).

In addition, when it is assumed that induction heating of a low-resistance material such as aluminum is also required, the number of twisted wires of the litz wire should be 1000 or more as described above, or the number of turns of the coil should be about three times higher than that of iron. . On the other hand, if the induction heating object is throttled with a high resistance material in advance, the number of twisted wires is good and do not need to increase the number of turns of the coil, so that the induction heating coils 6 and 7 can be configured at a lower cost. .

The inverter 24 is supplied as a driving power source by converting the AC current from the commercial AC power supply 26 into the direct current through the rectifier circuit 27. Moreover, the alternating current from the commercial alternating current power supply 26 is also supplied to the heat generating body energizing part (electric supply means) 28. The heating element energizing control unit 28 supplies AC power to the infrared heater 19 (and 19), so that the amount of energization is controlled by the thermal power control unit 21 via the heating element energizing control unit 28.

Further, current transformers 29 and 30 are disposed on the input side of the rectifier circuit 27 and the output side of the inverter 24, respectively, and such a detection signal is provided to the thermal power control device 21. And the thermal power control apparatus 21 detects the input current ip to a heating cooker, and the coil current ic which is an output current of the inverter 24. As shown in FIG. Moreover, in the above, the induction heating coils 6 and 7, the inverter 24, the infrared heaters 19 and 20, and the heating element energization control part 28 comprise the heating unit 60. As shown in FIG.

Next, the operation of this embodiment will be described with reference to Figs. Fig. 4 is a flowchart showing the control contents by the thermal power control device 21 with respect to the parts related to the gist of the present invention. When the thermal power control apparatus 21 reads the setting value of the input electric power set by the user through the operation part 22 (step S1), the material determination of the cooking container 8 is performed (step S2). In step S3 and S5, it is determined whether it is a high resistance metal material or a medium resistance metal material, respectively.

For example, is it a high-resistance metal material such as iron, a medium-resistance metal material such as non-magnetic stainless steel (SUS), a low-resistance metal material such as aluminum or copper, or a non-metallic material such as vagina pan or glass In order to determine, when the high frequency current having a constant voltage and frequency is supplied to the induction heating coil 6 by the inverter 24, the input current ip and the inverter 24 as shown in FIG. Judgment is made in accordance with the relationship with the coil current ic, which is the output current of?).

That is, when the material of the cooking vessel 8 is a magnetic material such as iron, the magnetic flux generated from the induction heating coil 6 easily flows through the cooking vessel 8, and is easily exchanged with the cooking vessel 8 to leak. Since the magnetic flux decreases, the equivalent inductance L of the coil 6 (see FIG. 5B) becomes small. In addition, the magnetic material has a large specific resistance and also has a large skin effect (the effect of eddy current concentration on the induction heating coil 6 side of the bottom of the pot), so that the equivalent resistance R of the coil 6 becomes large.

On the other hand, in the case of a material having a low specific resistance such as aluminum or copper, the magnetic flux generated from the coil 6 is less likely to reach the cooking vessel 8, and the leakage magnetic flux increases, so that the equivalent inductance L of the coil 6 is increased. Becomes large. And since the specific resistance is small and the skin effect is small, the equivalent resistance R also becomes small. Nonmagnetic SUS represents an intermediate value between iron and aluminum. In the case of nonmetals such as vaginal pots or no loads, the inductance current does not flow completely, so the equivalent inductance L is the largest and the equivalent resistance R is the smallest.

The coil current ic is inversely proportional to the equivalent impedance Z of the induction heating coil 6, and the input current ip is proportional to the coil current ic and R / Z. As a result, the relationship as shown in Fig. 5A depends on the material of the cooking vessel 8. In other words,

Coil Current (ic) Input Current (ip)

Iron (R versus Z) versus (R / Z)

Among non-magnetic SUS (R double → Z heavy) among (R / Z heavy)

Aluminum Large (R Small → Z Small) Small (R / Z Small)

Base metal (vaginal pot) small (ωL large → Z large large) small (R / Z small)

Therefore, the material of the cooking container 8 can be determined based on the magnitude relationship between the input current ip and the coil current ic.

And if it determines with a material of high resistance metal material in step S3 ("YES"), the thermal power control apparatus 21 will perform induction heating cooking as input power to the inverter 24 reading the input power set value read by step S1. It performs (step S4). That is, it is normal induction heating cooking performed conventionally.

On the other hand, if the material is a heavy resistance metal material (step S5, "YES"), the thermal power control device 21 performs induction heating cooking at a level at which the current flowing in the induction heating coil 6 does not become excessive (step S6). . And when the thermal power of induction heating cooking was adjusted in step S6, if there exists a difference between the heating power and the input power setting value read by step S1 (step S7, "YES"), the thermal power control apparatus 21 will The electric power of the difference is supplied to the heating element energization control unit 28 to perform infrared heating (step S8). In the case of a low-resistance nonmagnetic metal material, the equivalent resistance R of the induction heating coil 6 becomes small, so that the voltage applied to the induction heating coil 6 through the inverter 24 is converted to high magnetic resistance. The heating efficiency is improved by adjusting to lower or raise the frequency than in the case of a metallic material (step S9).

In addition, in step S5, when the material is not a medium resistance metal material ("N0"), the material is a low resistance nonmagnetic metal material such as aluminum or a nonmetal material such as vaginal pot or no load. In this case, induction heating cooking is not performed, and infrared heating is performed by supplying electric power equal to the input power set value read in step S1 to the heating element energization control unit 28 (step S10). As described above, the non-metallic material and no load cannot be discriminated from the relationship between the input current ip and the coil current ic. Therefore, the temperature detection means 11, 12 detects the temperature rise degree from the infrared heating start in step S9 (step S11).

That is, as shown in Fig. 6, in the case where a vaginal pot or the like is loaded in the loading section 4 of the upper plate 3, for example, since the heat capacity of the load is large, the degree of temperature rise from the start of heating (vertical) Rise) is relatively mitigated. On the other hand, when there is no load, since there is only only the heat capacity of the upper plate 3, the temperature rise degree from a heating start becomes comparatively abrupt. Based on the difference of the temperature rise degree, a nonmetallic material and no load are discriminated. And if it determines with no load (step S12, "YES"), the thermal control apparatus 21 will stop infrared heating (step S13), and if it will determine that it is a nonmetallic material ("NO"), it will return to step S1 as it is and will perform infrared heating. Continue.

According to the present embodiment as described above, the heating cooker is provided with an induction heating coil 6 and an infrared heater 19, and the thermal power control device 21 determines the material of the cooking vessel 8, Therefore, the inverter 24 and the heating element energization control unit 28 were controlled to control the heating rate by the induction heating coil 6 and the infrared heater 19.

Therefore, when heating the cooking vessel 8 of the material from which efficiency falls in induction heating, efficient heating can be performed by raising the heating ratio by the infrared heater 19 relatively, and the cooking vessel 8 Since the heating balance between the induction heating and the infrared heating can be selected according to the material, the cooking vessel 8 made of various materials such as iron, SUS, aluminum, and copper can be heated with high efficiency.

Specifically, for example, it is determined whether it is a high resistance material such as the cooking vessel 8, a medium resistance material such as nonmagnetic SUS, a low resistance material such as aluminum, or a non-metallic material. In the case of a medium resistance material, induction heating and infrared heating are used together, and in the case of a low resistance material or a nonmetal material, only infrared heating is performed. When the induction heating coil 6 is made of a high resistance material, the number of turns and the number of twisted lines are reduced so as to improve the heating efficiency, so that the induction heating coil can be configured at low cost and the induction heating efficiency is improved.

In addition, the power supplied to the induction heating coil 6 and the inverter 24 is reduced, and the power elements such as the IGBT constituting the inverter 24, the resonant capacitor 25, and the elements such as the smoothing capacitor and the inductor (not shown). You can choose the smallest and cheapest. Moreover, since the power supply to the induction heating coil 6 becomes small, the high frequency electric current which flows through a human body through a pot etc. becomes small, and there is no need to insert a shield plate etc. between the upper plates 3. In addition, since the infrared heater 19 can radiate infrared rays and heat them to a temperature of 500 ° C. or more, it is not necessary to increase the installation area by that much, and to avoid possible interference with the arrangement with the induction heating coil 6. have. In addition, since the cross-sectional area of the infrared heater 19 becomes small, since the infrared heater 19 itself hardly inductively heats, the induction heating efficiency can be prevented from decreasing.

And when it determines with the non-metallic material of the cooking container 8, the thermal control apparatus 21 stops supply of the electric current to the induction heating coil 6 by the inverter 24, and supplies it to the infrared heater 19 only. Control to perform heating. That is, in the case of a nonmagnetic material such as aluminum or copper, the magnetic flux generated by the induction heating coil 6 is hardly absorbed, so the magnetic flux easily leaks as induction heating. On the other hand, since the amount of magnetic flux generated by energizing the infrared heater 19 is low and low frequency, heating can be performed in a state in which the magnetic flux leakage is hardly affected. Moreover, even the cooking vessel 8 of nonmetallic materials, such as a quality pot and a glass pot, can respond, and in that case, supply of the electric power which does not contribute to heating can be suppressed.

Further, according to the present embodiment, since the induction heating coil 6 and the infrared heater 19 are disposed to face the lower surface side of either upper plate 3, the isolation distance from the cooking vessel 8 becomes short. Induction heating and infrared heating can be performed efficiently. Therefore, also in this point, since the arrangement | positioning which does not interfere with the induction heating coil 6 and the infrared heater 19 is carried out, heating efficiency can be improved, without making infrared heating and induction heating mutually simultaneously. Moreover, since the induction heating coil 6 is arrange | positioned at the center side of the heating unit 60, even if a pot diameter is small, induction heating can be performed efficiently.

And since the induction heating coil 6 was divided into two and the infrared heater 19 was arrange | positioned in between, the magnetic flux which generate | occur | produces in the induction heating coil 6 located in the both sides of the infrared heater 19 is mutually indefinite direction. As a result, the infrared heater 19 is less likely to be inductively heated. In addition, since the induction heating coil 6 is wound in two stages, the number of turns can be increased without taking a very large space.

Further, the temperature detecting means 11 is arranged inside the ring-shaped infrared heater 19, and the infrared rays from which the side wall 17a of the infrared heater supporting member 17 is radiated from the infrared heater 19 are detected. Since it was formed so as to function as a barrier against the means 11, the temperature detection of the cooking vessel 8 can be performed with high accuracy when performing infrared heating.

(2nd Example)

Fig. 7 shows a second embodiment of the present invention. The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Only the other parts will be described below. In the second embodiment, the arrangement form of the induction heating coil and the infrared heater on the lower side of the upper plate 3 is different. That is, as shown in Fig. 7, which is equivalent to Fig. 2, an induction heating coil 31 wound in two stages is disposed on the center side of the mounting portion 4, and the infrared heater support member 32 and Two infrared loop heaters 33a and 33b are arranged. The induction heating coil 31 and the infrared loop heaters 33a and 33b constitute the heating unit 61.

Also in the case of the second embodiment configured as described above, almost the same effects as in the first embodiment can be obtained.

(Third Embodiment)

Figure 8 shows a third embodiment of the present invention. The third embodiment also shows an example in which the arrangement of the induction heating coil and the infrared heater in the lower side of the upper plate 3 is different, similar to the second embodiment. That is, as shown in FIG. 8, the infrared heater support member 34 is arrange | positioned at the center side of the loading part 4, and the infrared ray ribbon heater (infrared ray heater) inside the infrared heater support member 34 ( 35) is arrange | positioned in the state wound up multiple times. An induction heating coil 36 wound in two stages is disposed on the outer circumferential side of the infrared ribbon heater 35.

In addition, as for the side wall of the infrared heater support member 34, the infrared rays radiate | emitted from the infrared ribbon heater 35 like the infrared heater support members 17 and 32 in 1st, 2nd Example, the temperature detection means 11 It is formed so as to function as a protective wall for blocking the corresponding thing. In addition, the infrared ribbon heater 35 and the induction heating coil 36 constitute the heating unit 62.

According to the 3rd Example comprised as mentioned above, since the infrared ribbon heater 35 was arrange | positioned at the center side of the heating unit 62, even if a pot diameter is small, infrared heating can be performed efficiently.

(Example 4)

9 shows a fourth embodiment of the present invention. In the fourth embodiment, the induction heating coil 37 wound in two stages is divided into two, 37a and 37b as in the first embodiment, and the infrared heater support member 38 is the induction heating coils 37a and 37b. It has a shape between the outer peripheral side of the induction heating coil 37b and the recessed part, and arrange | positions so that the upper part of the induction heating coil 37a, 37b may be covered.

The infrared heater 39a is divided into two of the radiant heaters 39, 39a, and 39b, and the infrared heater 39a is between the induction heating coils 37a and 37b, and the infrared heater 39b is the induction heating coil 37b. Is housed in the recessed portion of the infrared heater support member 38 so as to be located on the outer circumferential side of the &lt; RTI ID = 0.0 &gt; That is, it arrange | positions so that it may alternate with the induction heating coil 37a, the infrared heater 39a, the induction heating coil 37b, and the infrared heater 39b from the center side of the mounting part 4. As shown in FIG. In addition, the induction heating coil 37 and the infrared heater 39 constitute the heating unit 63. In addition, the infrared rays 39 are accommodated in the recesses of the infrared heater support member 38 so that the infrared rays radiated do not reach the temperature detecting means 11 in the same manner as in the above-described respective embodiments.

According to the fourth embodiment configured as described above, since the induction heating coils 37 and the infrared heaters 39 which are divided into two are arranged so as to be alternately arranged, the induction heating and Infrared heating can be efficiently performed, and the heating distribution state of the pot bottom can be made more favorable.

(Example 5)

Fig. 10 shows a fifth embodiment of the present invention. In the fifth embodiment, the induction heating coil 40 is divided into three, the inner coil 40a, the intermediate coil 40b, and the outer 40c, and the inner coil 40a and the outer 40c are located at the same end. The intermediate coil 40b positioned between them is configured in a two-stage configuration by being disposed at a position lowered by one stage in FIG. Accordingly, the induction heating coil supporting member 41 is formed in a shape in which a portion where the intermediate coil 40b is positioned to form a concave portion corresponding to the above configuration, and is similar to the first embodiment above the intermediate coil 40b. The infrared heater support member 17 and the infrared heater 19 are arrange | positioned. Further, ferrites 42a, 42b, 42c are disposed below the induction heating coil support member 41. The infrared heater 19 and the coil 40 form a heating unit 64.

According to the fifth embodiment configured as described above, since the portion 40b which is a part of the induction heating coil 40 is disposed below the infrared heater 19, the number of turns of the induction heating coil 40 is reduced without taking the arrangement space. You can increase it.

(Example 6)

Fig. 11 is a sixth embodiment of the present invention, and the sixth embodiment is implemented with a slight modification of the control mode in the first embodiment. That is, although FIG. 11 is equivalent to FIG. 4, step S5-step S9 are deleted, and when it determines with "NO" in step S3, it transfers to step S10. Therefore, in this case, if the material of the cooking container 8 is not a high resistance material like iron, all will be infrared-heated by the infrared heater 19. FIG.

Also in the case of the sixth embodiment configured as described above, effects similar to those of the first embodiment can be obtained.

The present invention is not limited only to the embodiment described above in the drawings, but the following modifications are possible.

The infrared heater support member 17 or the like has a property as a heat insulating material so that heat generated by the infrared heater 19 does not conduct to the induction heating coil 6 or the induction heating coil support member 13 side, or electric heat It has a property as a reflecting plate which reflects this to the upper plate 3 side, and a thing as a magnetic shield which prevents the influence of the magnetic flux which the induction heating coil 6 generate | occur | produced to the infrared heater 19 side. The characteristics may be appropriately combined as necessary.

The weight of the cooking vessel may be detected, and in the case of a medium resistance material, the ratio between the induction heating and the heating by the heating element may be controlled according to the weight of the cooking vessel.

Even in the case of a low-resistance material such as aluminum, induction heating may be performed in a range in which a phenomenon such as "pot float" does not occur (that is, the same control as that in FIG. 5 of Japanese Patent Application No. 2004-248371). In addition, the "only" in "controlling to supply electric power to the said electricity supply means only when the determined material is a low resistance material" of Claim 2, for example, is substantially for heating of a low resistance material, for example. It shall also include supplying electric power simultaneously to the high frequency current supply means side at a level which does not contribute.

In addition, even if it does not control the ratio between induction heating and infrared heating, heating may be performed by changing the amount of electric power supplied to the inverter 24 and the heating element energization control part 28, respectively.

The temperature detection means may comprise an infrared sensor.

In addition, heating control may be performed by detecting the temperature of the induction heating coil, the infrared heater, or a portion that has a temperature relationship therewith, or the temperature may be controlled to increase excessively.

The material of the cooking vessel is not limited to being automatically determined by the heating cooker side. For example, the user may input and set the material.

According to the present invention, by using at least one of the induction heating coil and the heating element, efficient heating suitable for the material of the cooking vessel can be performed, so that the number of turns of the induction heating coil is reduced and the number of twisted wires is reduced, thereby making it low cost. can do. In addition, when infrared radiation is radiated and heated by an infrared heater, it is not necessary to increase the installation area of the heating element by that much, so that the arrangement with the induction heating coil can be avoided as much as possible. And it becomes possible to perform the temperature detection at the time of performing radiant heating with high precision.

Claims (9)

delete Housings, An upper plate constituting the upper surface of the housing, on which the cooking vessel is loaded; When the cooking vessel is a high-resistance material, it is composed of an induction heating coil configured to improve the heating efficiency and a loop-shaped infrared heater radiating infrared rays, and these induction heating coils and the infrared heater are arranged at the inner circumferential side. A heating unit disposed in the housing so as to be able to heat the cooking vessel opposite to the upper plate in a state of being combined in a concentric shape; A temperature detecting means disposed inside the loop formed by the infrared heater, for detecting a temperature of the cooking vessel; A shielding member between the temperature detecting means and the infrared heater to prevent the infrared radiation radiated by the infrared heater from reaching the temperature detecting means; High frequency current supply means for supplying a high frequency current to the induction heating coil; Energizing means for energizing the infrared heater to generate heat; Heating control means for controlling heating to the cooking vessel by controlling power supplied to the high frequency current supply means and the energization means, respectively; It is provided with a material determination means for determining the material of the cooking vessel, And when it is determined by the material determining means that the material of the cooking vessel is a low resistance material, the heating control means controls to supply electric power only to the energizing means. delete delete delete The induction heating coil and the infrared heater are divided into at least a plurality of the induction heating coils. The heating cooker characterized by being arranged alternately in a state arranged in. The heating cooker according to claim 6, wherein only the induction heating coil is divided into two, and the infrared heater is disposed between two divided induction heating coils. The heating cooker according to claim 2, wherein at least a portion of the induction heating coil is wound to form a plurality of stages. The heating cooker according to claim 6, wherein an induction heating coil on an inner circumferential side of the divided induction heating coils is disposed below the infrared heater.

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