WO2013105503A1 - Induction heating rice cooker - Google Patents

Induction heating rice cooker Download PDF

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Publication number
WO2013105503A1
WO2013105503A1 PCT/JP2013/000062 JP2013000062W WO2013105503A1 WO 2013105503 A1 WO2013105503 A1 WO 2013105503A1 JP 2013000062 W JP2013000062 W JP 2013000062W WO 2013105503 A1 WO2013105503 A1 WO 2013105503A1
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WO
WIPO (PCT)
Prior art keywords
pan
heating coil
rice cooker
heating
induction heating
Prior art date
Application number
PCT/JP2013/000062
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French (fr)
Japanese (ja)
Inventor
直 奥田
新田　浩朗
卓 桐石
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2013553267A priority Critical patent/JP5874000B2/en
Priority to CN201380005094.5A priority patent/CN104039202B/en
Publication of WO2013105503A1 publication Critical patent/WO2013105503A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/129—Cooking devices induction ovens
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/06—Steam-heated kettles for domestic use
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment

Definitions

  • the present invention relates to an induction heating rice cooker used for cooking rice in general households, restaurants and the like.
  • this type of rice cooker has a heating coil that generates an induction magnetic field for heating the pot in the rice cooker, and this heating coil heats the bottom part of the pot, and the bottom of the pot.
  • an induction heating rice cooker that has an outer coil disposed obliquely to heat a slope portion between the side surfaces and heats the pan three-dimensionally.
  • the lower part of a heating coil is equipped with the ferrite and the coil base which supports the said heating coil and the said ferrite,
  • the said heating coil, the said ferrite, and the said coil base are made of resin.
  • An induction heating rice cooker that is insert-molded and integrally molded is known (for example, see Patent Document 1).
  • the structure of the conventional induction heating rice cooker configured as described above requires expensive equipment such as an expensive insert molding device, and it is difficult to manufacture the rice cooker at low cost. there were.
  • the manufacturing cost can be reduced, but the induction magnetic field generated by the heating coil is reduced.
  • heating coil configured as described above when used, heating concentrates at the center of the pan bottom, the temperature of the side surface portion of the pan becomes difficult to rise, and temperature control becomes difficult. It had the subject that performance fell.
  • the present invention solves the problems in the conventional induction heating rice cooker, and the heating coil generates an induction magnetic field in a desired state to uniformly heat the pan, so that the induction heating with improved rice cooking performance is achieved.
  • the purpose is to provide a rice cooker.
  • the induction heating rice cooker of the present invention is The body, A pan that is detachably stored in the main body; A ring-shaped heating coil disposed opposite to the bottom of the pan and generating an induction magnetic field for heating the pan; An inverter that applies a high-frequency current to the heating coil; A control unit for controlling a high-frequency current applied to the heating coil,
  • the heating coil has an inner peripheral portion and an outer peripheral portion, and the outer peripheral portion is configured to have a height in the vertical direction higher than that of the inner peripheral portion.
  • an induction heating rice cooker in which the heating coil generates an induction magnetic field in a desired state and the pan can be heated uniformly and rice cooking performance is improved.
  • the induction heating rice cooker is: The body, A pan that is detachably stored in the main body; A ring-shaped heating coil disposed opposite to the bottom of the pan and generating an induction magnetic field for heating the pan; An inverter that applies a high-frequency current to the heating coil; A control unit for controlling a high-frequency current applied to the heating coil,
  • the heating coil has an inner peripheral portion and an outer peripheral portion, and the outer peripheral portion is configured to have a height in the vertical direction higher than that of the inner peripheral portion.
  • the heating coil can generate the induction magnetic field substantially uniformly, and the pan can be heated uniformly.
  • the induction heating rice cooker according to the first aspect of the present invention is a rice cooker in which heating unevenness is suppressed and rice cooking performance is improved.
  • the induction heating rice cooker of the 1st viewpoint which concerns on this invention it becomes possible to concentrate the induction magnetic field which a heating coil generates on the outer side of a pan, and the outer side of the said pan is concentrated and heated.
  • stimulating the heat transfer from the bottom face of a pan to a side surface the said pan is heated three-dimensionally, the said pan is heated uniformly as a result, and rice cooking performance can be improved.
  • the heating coil can be formed and supported easily, and an inexpensive configuration that can suppress the manufacturing cost can be achieved.
  • the induction heating rice cooker according to a second aspect of the present invention is the heating coil according to the first aspect, wherein the outer peripheral portion has a higher height in the pan direction than the inner peripheral portion, and the outer peripheral portion.
  • the gap between the pan and the pan is configured to be smaller than the gap between the inner peripheral portion and the pan.
  • the outer peripheral portion of the heating coil is narrower than the inner peripheral portion, and the gap between the pan and the outer peripheral portion of the heating coil and the pan is reduced. And the induced magnetic field can be concentrated outside.
  • the induction heating rice cooker of the 2nd viewpoint which concerns on this invention it becomes possible to concentrate and heat the outer side of a pan, accelerate heat transfer from the bottom face of a pan to a side surface, Heating three-dimensionally, as a result, the pan can be heated uniformly to improve rice cooking performance.
  • the heating coil according to the first aspect or the second aspect is formed by winding a litz wire.
  • the litz wire comprised by the copper wire made by twisting a plurality of thin enamel wires as a heating coil is used. Therefore, it has the effect of preventing an increase in resistance due to the skin effect when a high-frequency current is passed through the conductor.
  • the said outer peripheral part is compared with the said inner peripheral part, The number of turns per unit length in the radial direction is increased.
  • the induction heating rice cooker according to the fourth aspect of the present invention configured as described above can generate the induction magnetic field substantially uniformly in the heating coil and heat the pan uniformly.
  • the induction heating rice cooker of the 4th viewpoint which concerns on this invention turns into a rice cooker by which the heating nonuniformity was suppressed and the rice cooking performance improved.
  • the induction heating rice cooker of the 4th viewpoint which concerns on this invention can concentrate the induction magnetic field which a heating coil generate
  • the said pot accommodated in the said main body and the said heating coil are included.
  • the protective frame is configured by a metal material having a low magnetic permeability.
  • a current opposite to the current flowing in the heating coil flows in the protective frame by the induction magnetic field generated by the heating coil.
  • the protective frame generates an induction magnetic field opposite to the induction magnetic field generated by the heating coil, and the induction magnetic fields cancel each other out.
  • a magnetic shielding effect can be obtained by the frame.
  • the induction heating rice cooker in an induction heating rice cooker, heat energy radiated from the pot in accordance with the Stefan-Boltzmann law is proportional to the fourth power of the temperature. Therefore, when the temperature of the pot becomes high in the rice cooking process, the radiation of heat energy increases. .
  • a protective frame is provided on the outside of the pan, and the protective frame is a low permeability metal material, so the reflectance is high, It is possible to reflect the heat energy and return it to the pan.
  • the induction heating rice cooker of the 5th viewpoint which concerns on this invention can further improve the heating efficiency of a pan, and has the structure which can aim at the further improvement of rice cooking performance.
  • heat generated by the loss of the heating coil can be transferred to another member (such as a pan) via the partition plate. It becomes. Moreover, it becomes possible to hold
  • the partition plate since the partition plate is provided, it becomes possible to make a heating coil in the bottom face of a pot accommodating part invisible to a user, and it is safe. It is possible to improve the design (shape) of the pot storage part as well as ensuring the performance.
  • the induction heating rice cooker of the 6th viewpoint which concerns on this invention
  • the protective frame is provided like the induction heating rice cooker of the said 5th viewpoint, the heat_generation
  • the configuration is easy to convey to the protective frame via the partition plate. Since the protective frame is a metal material, it has a high thermal conductivity and the temperature is likely to be uniform. Therefore, the induction heating rice cooker according to the sixth aspect of the present invention generates heat due to the loss of the heating coil. And it becomes possible to heat a pan uniformly through a protective frame, and it becomes possible to aim at the further improvement of rice cooking performance.
  • induction heating rice cooker of the present invention is not limited to the structure of the induction heating cooker described in the following embodiment, The technical idea equivalent to the technical idea demonstrated in the following embodiment
  • the induction heating rice cooker comprised based on is included.
  • FIG. 1 shows a side sectional view of an induction heating rice cooker according to Embodiment 1 of the present invention.
  • the main body 1 is formed in a substantially cylindrical shape whose upper surface is open, and includes a protective frame 10 serving as a pot storage portion inside the main body 1.
  • a pan 2 having a water level line drawn on its inner peripheral surface is detachably disposed.
  • the protective frame 10 is provided inside the main body 1 so as to enclose the heating coil 5 together with the pot 2.
  • the protective frame 10 is made of a low permeability metal material.
  • the induction heating rice cooker of the first embodiment a current opposite to the current flowing through the heating coil 5 flows through the protective frame 10 due to the induction magnetic field generated by the heating coil 5.
  • the protective frame 10 an induction magnetic field opposite to the induction magnetic field generated by the heating coil 5 is generated, so that the magnetic fields from the heating coil 5 cancel each other, and the protective frame 10 has a magnetic shielding effect. It will be a thing.
  • the protective frame 10 is provided on the outside of the pan 2, and the protective frame 10 is a metal material having a low magnetic permeability. The heat energy from is reflected back to the pan.
  • the protective frame 10 made of a low magnetic permeability metal material for example, an aluminum material, is provided, the heating efficiency of the pan 2 is improved, and rice cooking is performed. The performance is improved.
  • the heating coil 5 is disposed to face the bottom surface of the pan 2 housed in the protective frame 10 and generates an induction magnetic field for heating the pan 2. It has a ring shape.
  • a ferrite 14 is provided on the lower surface of the heating coil 5 to converge the induction magnetic field generated by the heating coil 5.
  • a partition plate 15 is provided between the pan 2 and the heating coil 5.
  • the partition plate 15 is disposed between the heating coil 5 and the pan 2, and the partition plate 15 and the outer peripheral portion 5b of the heating coil 5 are arranged.
  • the upper surface (the surface facing the pan 2) is in contact with the heat transfer.
  • the partition plate 15 since the partition plate 15 is in contact with the protective frame 10 so that heat can be transferred at the outer peripheral portion thereof, the heat energy generated by the loss of the heating coil can be transmitted to the protective frame 10 via the partition plate 15. is there.
  • the protective frame 10 is made of a metal material with low magnetic permeability, has a high thermal conductivity, and has a characteristic that the temperature tends to be uniform.
  • the heat energy of the heat generated by the loss is transferred to the pan 2 through the partition plate 15 and the protective frame 10, and it becomes possible to assist the uniform heating of the pan 2 and further improve the rice cooking performance. it can.
  • the heat generated by the loss of the heating coil is transferred to other members such as the pan and the protective frame 10 through the partition plate 15.
  • the partition plate 15 is also used as a heat transfer member.
  • the partition plate 15 since the partition plate 15 is provided, it becomes possible to hold
  • the partition plate 15 is provided, the heating coil 5 on the bottom surface of the pan storage portion is not visible to the user, ensuring safety and the pan. The design (look) of the storage part is improved.
  • control part 8 is provided in the inside of the main body 1, and the control part 8 controls the inverter 7 to apply the high frequency current to the heating coil 5, so that the pan 2 housed in the protective frame 10 is removed. Heat.
  • a lid 3 is attached to the upper part of the main body 1 so as to be freely opened and closed.
  • the lid 3 is supported so as to be rotatable around a hinge 3a located at a rear portion of the protective frame 10 (the end portion on the back side of the lid 3 and the right end portion in FIG. 1).
  • the lid 3 is urged to be opened by a rotating spring.
  • a hook button (not shown) pivotally supported on the front portion of the protective frame 10 is disposed.
  • the hook button is fitted to the lid 3 so that the lid 3 is closed. That is, when the hook button is fitted to the lid 3, the lid 3 is not held open and is securely held by the hook button, and the pot storage portion is closed.
  • an inner lid 4 having a steam port 4b for discharging steam generated in the pan 2 during rice cooking and heat insulation is disposed.
  • a steam port packing 6 is disposed between the steam cylinder 11 and the inner lid 4 to prevent the steam from flowing into the lid 3.
  • an inner lid packing 4a that is in contact with the upper surface of the flange portion (not shown) of the pan 2 is disposed on the outer peripheral portion of the inner lid 4, and steam generated in the pan 2 during cooking and heat retention. It is prevented from flowing outside from the steam port 4b.
  • the pan temperature detection unit 9 is in contact with the approximate center of the bottom of the pan 2 and detects the temperature of the pan 2 by heat conduction.
  • the lid temperature detector 12 is in contact with the inner lid 4 and detects the temperature of the pan 2 by heat conduction.
  • the operation display unit 13 receives a heating condition by an operation by the user, and displays and notifies the user of the state of the rice cooker.
  • cover 3, and the steam cylinder 11 have a resin case
  • the partition plate 15 has a resin plate
  • the pan 2 has a metal pan such as iron or SUS.
  • the microcomputer can be easily configured by using a thermistor for the pan temperature detection unit 9 and the lid temperature detection unit 12, an aluminum material for the protective frame 10, and a touch panel for the operation display unit 13.
  • FIG. 2 shows a plan view and a side sectional view of a heating coil in the induction heating rice cooker according to the first embodiment of the present invention.
  • the heating coil 5 in the induction heating rice cooker of Embodiment 1 is formed by winding a twisted litz wire into a ring shape, and the outer peripheral portion 5b of the heating coil 5 is compared with the inner peripheral portion 5a.
  • the height L is increased.
  • the litz wire is a stranded wire, the width in the radial direction of the heating coil 5 changes according to the height, and the width becomes narrower when the height is high. Therefore, the outer peripheral portion 5b has a larger number of turns per unit length in the radial direction than the inner peripheral portion 5a. That is, the outer peripheral portion 5b has a higher coil density than the inner peripheral portion 5a.
  • the litz wire is a copper wire formed by twisting a plurality of thin enamel wires, and has an effect of preventing an increase in resistance due to a skin effect when a high-frequency current is passed through a conductor.
  • the induction magnetic field generated by the heating coil 5 can be generated substantially uniformly by changing the heights of the inner peripheral part 5a and the outer peripheral part 5b to an appropriate height.
  • the induction magnetic field generated by the heating coil 5 can be concentrated on the outer portion.
  • the outer peripheral part 5b in the heating coil 5 is higher in the vertical direction (upward direction in FIG. 2) of the pan 2 than the inner peripheral part 5a. It is configured to increase the length L and approach the pan 2.
  • the heating coil 5 has a planar shape, and the lower surface (ferrite 14) in the vertical direction of the inner peripheral portion 5 a and the outer peripheral portion 5 b. The surface in contact with the surface is substantially the same plane.
  • the outer peripheral portion 5b is compared to the inner peripheral portion 5a with respect to the pan 2, as described above. It is configured to approach. Therefore, the space
  • the outer peripheral portion 5b of the heating coil 5 is narrower than the inner peripheral portion 5a so that the gap between the pan 2 and the heating coil 5 and the pan 2 is improved. It is possible to concentrate the induction magnetic field on the outer portion of the heating coil 5.
  • the rice cooking process of the induction heating rice cooker according to the first embodiment includes a water immersion process in which water is absorbed by the rice, a cooking process in which the temperature in the pan is increased to a boil, and boiling is maintained to gelatinize the starch of the rice.
  • a boiling maintaining step for making the rice into a boiled rice and an unevenness step for uniformly finishing the inside of the pan by steaming the cooked rice, and a control method in each step is stored in the control unit 8.
  • the control part 8 After a user puts a predetermined amount of rice and water into the pan 2 and sets the pan 2 on the main body 1, the user performs an operation for starting rice cooking using the operation display unit 13, and a command signal for starting rice cooking is received. It is transmitted to the control unit 8. If the control part 8 receives the command signal of a rice cooking start, the control part 8 will start a water immersion process.
  • the water immersion process is a process that allows the rice to be sufficiently gelatinized in the subsequent steps by immersing the rice in water at a temperature lower than the temperature at which the rice is gelatinized and preliminarily absorbing the rice. .
  • the water soaking process is a process in which starch is decomposed by amylase contained in rice to produce glucose, thereby producing the sweetness of rice. For this reason, in a water immersion process, it controls so that the detection temperature of the pan temperature detection part 9 may be about 60 degreeC for predetermined time (for example, 20 minutes).
  • control unit 8 performs temperature detection by the pan temperature detection unit 9, and if the temperature detection information from the pan temperature detection unit 9 is 60 ° C. or less, operates the inverter 7 to apply a high frequency current to the heating coil 5. Then, the pan 2 is heated. On the other hand, if the detected temperature information is 60 ° C. or higher, the inverter 7 is operated to stop the current application to the heating coil 5 and the heating of the pan 2 is stopped.
  • the pan 2 is heated until the detected temperature information from the pan temperature detecting unit 9 is close to the boiling point of water (for example, 100 ° C.).
  • the amount of the cooking object that is, the amount of cooked rice can be determined based on the difference in temperature gradient in the time transition of the detected temperature.
  • the boiling maintaining step is a step of gelatinizing the starch of rice to raise the degree of gelatinization to about 50% to 60%.
  • the controller 8 operates the inverter 7 to apply a high-frequency current to the heating coil 5 so that the rice and water in the pot 2 maintain a boiling state while the pot 2 has water, The pan 2 is heated.
  • the unevenness process is a process in which starch of rice is gelatinized to increase the degree of gelatinization to nearly 100%.
  • the temperature of the rice is prevented from lowering, and gelatinization is promoted to make the rice in the pan 2 uniform.
  • the heating operation is turned on / off so that the temperature of the pan temperature detection unit 9 is maintained at a predetermined temperature (for example, 80 ° C.).
  • the inner peripheral portion 5a of the heating coil 5 In the heating operation of the pan 2 in each of the above rice cooking steps, the inner peripheral portion 5a of the heating coil 5 generates an induction magnetic field in the inner portion of the bottom surface of the pan 2, and the outer peripheral portion 5b of the heating coil 5 is the bottom surface of the pan 2.
  • An induction magnetic field is generated in the outer portion, and each performs induction heating.
  • the heat of the outer portion of the bottom surface of the pan 2 is transferred to the side portion of the pan 2 to heat the pan 2 three-dimensionally.
  • the heat energy of heat generated by the loss in the heating coil 5 is transmitted to the bottom surface of the protective frame 10 via the ferrite 14.
  • the heat of the bottom surface portion of the protective frame 10 is transmitted to the side surface portion of the protective frame 10, and further transmitted to the side surface portion of the pan 2 through the air to heat the pan 2 three-dimensionally.
  • the heating coil 5 and the protective frame 10 are configured by thermally connecting the ferrite 14 and the like, heat energy generated in the heating coil 5 is generated. Is used to heat the pan 2 three-dimensionally, and has an excellent effect that the pan 2 can be heated with high efficiency.
  • the induction heating rice cooker of Embodiment 1 has the heat insulation effect by setting it as the structure which seals between the pan 2 and the protective frame 10, and the structure which can heat the pan 2 three-dimensionally. It becomes.
  • the pan temperature detection unit 9 abuts on the substantially central portion of the bottom surface of the pan 2 to detect the temperature of the pan 2 by heat conduction, and the water in the pan 2 is detected from the detected temperature.
  • the temperature of rice and rice is estimated and each rice cooking process is controlled.
  • the induction magnetic field generated by the heating coil 5 can be generated substantially uniformly, and the pan 2 can be heated uniformly. .
  • the configuration of the induction heating rice cooker of the first embodiment it becomes possible to accurately estimate the temperature of water or rice in the pan 2 and improve the rice cooking performance.
  • the heating coil 5 demonstrated in the structure which has two parts from which the height of the inner peripheral part 5a and the outer peripheral part 5b differs, this invention is such It is not limited to the configuration, and the heating coil is configured to have a plurality of parts having different heights, and the height is gradually increased from the inner periphery toward the outer periphery according to the shape of the pan. However, the same effect can be obtained.
  • the heating coil can generate an induction magnetic field in a desired state, for example, substantially uniformly, and as a result, the pan can be uniformly heated by the heating coil. Therefore, according to this invention, the heating nonuniformity can be suppressed and the rice cooker which the rice cooking performance improved can be provided.
  • the induction magnetic field generated by the heating coil can be concentrated outside the pan.
  • a pot can be heated uniformly and rice cooking performance can be improved.
  • the heating coil is configured in a planar manner, the heating coil can be easily formed and supported, and the manufacturing cost can be greatly suppressed.
  • the present invention is a rice cooker in which a heating coil can generate an induction magnetic field in a desired state, a pan can be heated uniformly, heating unevenness is suppressed, and rice cooking performance is improved. Since the coil can be easily formed and supported and can be manufactured at low cost, it is useful as a rice cooker used in general households, restaurants and the like.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

In order to improve rice cooking performance of this induction heating rice cooker by having a heating coil (5) generate an induction magnetic field in a desired state and uniformly heating a pan (2) housed in a main body, the ring-like heating coil is configured such that the heating coil has an inner circumferential portion (5a) and an outer circumferential portion (5b), and that the outer circumferential portion has a larger height (L) in the perpendicular direction compared with the inner circumferential portion, said heating coil being disposed to face the bottom surface of the pan housed in the main body, and generating the induction magnetic field for heating the pan.

Description

誘導加熱炊飯器Induction heating rice cooker
　本発明は、一般家庭、レストランなどでお米を炊くために使用される誘導加熱炊飯器に関するものである。 The present invention relates to an induction heating rice cooker used for cooking rice in general households, restaurants and the like.
　従来、この種の炊飯器としては、炊飯器内の鍋を加熱するための誘導磁界を発生させる加熱コイルを備えており、この加熱コイルが鍋の底面部分を加熱する内側コイルと、鍋の底面と側面の間の斜面部分を加熱する斜めに配置された外側コイルとを有して、当該鍋を立体的に加熱する誘導加熱炊飯器が知られている。 Conventionally, this type of rice cooker has a heating coil that generates an induction magnetic field for heating the pot in the rice cooker, and this heating coil heats the bottom part of the pot, and the bottom of the pot There is known an induction heating rice cooker that has an outer coil disposed obliquely to heat a slope portion between the side surfaces and heats the pan three-dimensionally.
　また、前記の従来の誘導加熱炊飯器においては、加熱コイルの下部にフェライトと、前記加熱コイルと前記フェライトを支持するコイルベースとを備え、前記加熱コイルと前記フェライトと前記コイルベースとを樹脂によりインサート成型して、一体成型された誘導加熱炊飯器が知られている（例えば、特許文献１参照。）。 Moreover, in the said conventional induction heating rice cooker, the lower part of a heating coil is equipped with the ferrite and the coil base which supports the said heating coil and the said ferrite, The said heating coil, the said ferrite, and the said coil base are made of resin. An induction heating rice cooker that is insert-molded and integrally molded is known (for example, see Patent Document 1).
特開２０００－６１９８６号公報JP 2000-61986
　しかしながら、前記のように構成された従来の誘導加熱炊飯器の構成では、高価なインサート成型装置が必要になるなど、高価な設備が必要とし、当該炊飯器を低コストで製造することが困難であった。 However, the structure of the conventional induction heating rice cooker configured as described above requires expensive equipment such as an expensive insert molding device, and it is difficult to manufacture the rice cooker at low cost. there were.
　なお、従来の誘導加熱炊飯器の構成において、加熱コイルの内側コイルと外側コイルを平面形状に形成した場合には、製造コストを低減することが可能となるが、当該加熱コイルが発生する誘導磁界が、鍋底の中心に集中し、当該鍋において加熱ムラが生じ、炊飯性能が低下するという課題を有していた。 In addition, in the structure of the conventional induction heating rice cooker, when the inner coil and the outer coil of the heating coil are formed in a planar shape, the manufacturing cost can be reduced, but the induction magnetic field generated by the heating coil is reduced. However, it concentrated on the center of a pan bottom, the heating nonuniformity produced in the said pan, and had the subject that rice cooking performance fell.
　また、前記のように構成された加熱コイルを用いた場合には、鍋底の中心に加熱が集中し、鍋の側面部分の温度が上昇し難くなり、温度制御が困難となり、この点においても炊飯性能が低下するという課題を有していた。 In addition, when the heating coil configured as described above is used, heating concentrates at the center of the pan bottom, the temperature of the side surface portion of the pan becomes difficult to rise, and temperature control becomes difficult. It had the subject that performance fell.
　本発明は、前記従来の誘導加熱炊飯器における課題を解決するものであり、加熱コイルが誘導磁界を所望の状態に発生させて、鍋を均一に加熱することにより、炊飯性能が向上した誘導加熱炊飯器を提供することを目的とする。 The present invention solves the problems in the conventional induction heating rice cooker, and the heating coil generates an induction magnetic field in a desired state to uniformly heat the pan, so that the induction heating with improved rice cooking performance is achieved. The purpose is to provide a rice cooker.
　前記従来の誘導加熱炊飯器における課題を解決するために、本発明の誘導加熱炊飯器は、
　本体と、
　前記本体内に着脱自在に収納される鍋と、
　前記鍋の底面に対向して配設され、前記鍋を加熱するための誘導磁界を発生させるリング状の加熱コイルと、
　前記加熱コイルに高周波電流を印加するインバータと、
　前記加熱コイルに印加する高周波電流を制御する制御部と、を備え、
　前記加熱コイルは、内周部と外周部を有し、前記外周部が前記内周部に比べて、鉛直方向の高さが高くなるよう構成されている。 In order to solve the problems in the conventional induction heating rice cooker, the induction heating rice cooker of the present invention is
The body,
A pan that is detachably stored in the main body;
A ring-shaped heating coil disposed opposite to the bottom of the pan and generating an induction magnetic field for heating the pan;
An inverter that applies a high-frequency current to the heating coil;
A control unit for controlling a high-frequency current applied to the heating coil,
The heating coil has an inner peripheral portion and an outer peripheral portion, and the outer peripheral portion is configured to have a height in the vertical direction higher than that of the inner peripheral portion.
　本発明によれば、加熱コイルが誘導磁界を所望の状態に発生させて、鍋を均一に加熱することが可能となり、炊飯性能が向上した誘導加熱炊飯器を提供することができる。 According to the present invention, it is possible to provide an induction heating rice cooker in which the heating coil generates an induction magnetic field in a desired state and the pan can be heated uniformly and rice cooking performance is improved.
本発明に係る実施の形態１の誘導加熱炊飯器の側断面図Side sectional view of induction heating rice cooker according to the first embodiment of the present invention. 本発明に係る実施の形態１の誘導加熱炊飯器における加熱コイルの平面図と側断面図The top view and sectional side view of a heating coil in the induction heating rice cooker of Embodiment 1 which concerns on this invention.
　本発明に係る第１の観点の誘導加熱炊飯器は、
　本体と、
　前記本体内に着脱自在に収納される鍋と、
　前記鍋の底面に対向して配設され、前記鍋を加熱するための誘導磁界を発生させるリング状の加熱コイルと、
　前記加熱コイルに高周波電流を印加するインバータと、
　前記加熱コイルに印加する高周波電流を制御する制御部と、を備え、
　前記加熱コイルは、内周部と外周部を有し、前記外周部が前記内周部に比べて、鉛直方向の高さが高くなるよう構成されている。 The induction heating rice cooker according to the first aspect of the present invention is:
The body,
A pan that is detachably stored in the main body;
A ring-shaped heating coil disposed opposite to the bottom of the pan and generating an induction magnetic field for heating the pan;
An inverter that applies a high-frequency current to the heating coil;
A control unit for controlling a high-frequency current applied to the heating coil,
The heating coil has an inner peripheral portion and an outer peripheral portion, and the outer peripheral portion is configured to have a height in the vertical direction higher than that of the inner peripheral portion.
　前記のように構成された本発明に係る第１の観点の誘導加熱炊飯器は、加熱コイルが誘導磁界を略均一に発生させることが可能となり、鍋を均一に加熱させることが可能となる。その結果、本発明に係る第１の観点の誘導加熱炊飯器は、加熱ムラが抑制されて、炊飯性能が向上した炊飯器となる。 In the induction heating rice cooker according to the first aspect of the present invention configured as described above, the heating coil can generate the induction magnetic field substantially uniformly, and the pan can be heated uniformly. As a result, the induction heating rice cooker according to the first aspect of the present invention is a rice cooker in which heating unevenness is suppressed and rice cooking performance is improved.
　また、本発明に係る第１の観点の誘導加熱炊飯器によれば、加熱コイルが発生させる誘導磁界を鍋の外側に集中させることが可能となり、当該鍋の外側が集中して加熱されることにより、鍋の底面から側面への熱伝達を加速させ、当該鍋を立体的に加熱して、結果的に当該鍋を均一に加熱し、炊飯性能を向上させることができる。 Moreover, according to the induction heating rice cooker of the 1st viewpoint which concerns on this invention, it becomes possible to concentrate the induction magnetic field which a heating coil generates on the outer side of a pan, and the outer side of the said pan is concentrated and heated. By accelerating | stimulating the heat transfer from the bottom face of a pan to a side surface, the said pan is heated three-dimensionally, the said pan is heated uniformly as a result, and rice cooking performance can be improved.
　さらに、本発明に係る第１の観点の誘導加熱炊飯器によれば、加熱コイルの成形および支持が容易な構成となり、製造コストを抑制できる安価な構成とすることが可能となる。 Furthermore, according to the induction heating rice cooker according to the first aspect of the present invention, the heating coil can be formed and supported easily, and an inexpensive configuration that can suppress the manufacturing cost can be achieved.
　本発明に係る第２の観点の誘導加熱炊飯器は、前記の第１の観点の前記加熱コイルにおいて、前記外周部が前記内周部に比べて前記鍋方向の高さが高く、前記外周部と前記鍋との空隙が、前記内周部と前記鍋との空隙より小さくなるよう構成されている。 The induction heating rice cooker according to a second aspect of the present invention is the heating coil according to the first aspect, wherein the outer peripheral portion has a higher height in the pan direction than the inner peripheral portion, and the outer peripheral portion. The gap between the pan and the pan is configured to be smaller than the gap between the inner peripheral portion and the pan.
　前記のように構成された本発明に係る第２の観点の誘導加熱炊飯器においては、加熱コイルの外周部が内周部と比べて、鍋との空隙が狭く、加熱コイルの外周部と鍋との磁気結合が向上し、誘導磁界を外側に集中させることが可能となる。その結果、本発明に係る第２の観点の誘導加熱炊飯器によれば、鍋の外側を集中して加熱することが可能となり、鍋の底面から側面への熱伝達を加速させて、鍋を立体的に加熱して、結果的に鍋を均一に加熱し炊飯性能を向上させることができる。 In the induction heating rice cooker according to the second aspect of the present invention configured as described above, the outer peripheral portion of the heating coil is narrower than the inner peripheral portion, and the gap between the pan and the outer peripheral portion of the heating coil and the pan is reduced. And the induced magnetic field can be concentrated outside. As a result, according to the induction heating rice cooker of the 2nd viewpoint which concerns on this invention, it becomes possible to concentrate and heat the outer side of a pan, accelerate heat transfer from the bottom face of a pan to a side surface, Heating three-dimensionally, as a result, the pan can be heated uniformly to improve rice cooking performance.
　本発明に係る第３の観点の誘導加熱炊飯器においては、前記の第１の観点又は第２の観点における前記加熱コイルが、リッツ線を巻いて成形されている。 In the induction heating rice cooker according to the third aspect of the present invention, the heating coil according to the first aspect or the second aspect is formed by winding a litz wire.
　前記のように構成された本発明に係る第３の観点の誘導加熱炊飯器においては、加熱コイルとして、細いエナメル線を複数本撚り合わせて作られた銅線で構成されたリッツ線が用いられているため、高周波電流を導体に流す場合の表皮効果による抵抗増加を防止する効果を有している。 In the induction heating rice cooker of the 3rd viewpoint which concerns on this invention comprised as mentioned above, the litz wire comprised by the copper wire made by twisting a plurality of thin enamel wires as a heating coil is used. Therefore, it has the effect of preventing an increase in resistance due to the skin effect when a high-frequency current is passed through the conductor.
　本発明に係る第４の観点の誘導加熱炊飯器においては、前記の第１の観点乃至第３の観点におけるいずれかの態様における前記加熱コイルは、前記外周部が前記内周部に比べて、半径方向の単位長さ当たりの巻き数が多くなるよう構成されている。 In the induction heating rice cooker of the 4th viewpoint which concerns on this invention, as for the said heating coil in any aspect in the said 1st viewpoint thru | or the 3rd viewpoint, the said outer peripheral part is compared with the said inner peripheral part, The number of turns per unit length in the radial direction is increased.
　前記のように構成された本発明に係る第４の観点の誘導加熱炊飯器は、加熱コイルにおいて誘導磁界を略均一に発生させて、鍋を均一に加熱させることが可能となる。その結果、本発明に係る第４の観点の誘導加熱炊飯器は、加熱ムラが抑制され、炊飯性能が向上した炊飯器となる。 The induction heating rice cooker according to the fourth aspect of the present invention configured as described above can generate the induction magnetic field substantially uniformly in the heating coil and heat the pan uniformly. As a result, the induction heating rice cooker of the 4th viewpoint which concerns on this invention turns into a rice cooker by which the heating nonuniformity was suppressed and the rice cooking performance improved.
　また、本発明に係る第４の観点の誘導加熱炊飯器は、加熱コイルが発生する誘導磁界を外側に集中させることが可能でなり、鍋の外側を集中して加熱することにより鍋の底面から側面への熱伝達を加速させて、当該鍋を立体的に加熱し、結果的に鍋を均一に加熱して炊飯性能を向上させることができる。 Moreover, the induction heating rice cooker of the 4th viewpoint which concerns on this invention can concentrate the induction magnetic field which a heating coil generate | occur | produces on the outer side, and concentrates and heats the outer side of a pan from the bottom face of a pan. Heat transfer to the side surface can be accelerated to heat the pan three-dimensionally, and as a result, the pan can be heated uniformly to improve rice cooking performance.
　本発明に係る第５の観点の誘導加熱炊飯器においては、前記の第１の観点乃至第４の観点におけるいずれかの態様において、前記本体内に収納された前記鍋と前記加熱コイルとを内包するよう構成された保護枠を備え、前記保護枠が低透磁率の金属材料により構成されている。 In the induction heating rice cooker of the 5th viewpoint which concerns on this invention, in any aspect in the said 1st viewpoint thru | or a 4th viewpoint, the said pot accommodated in the said main body and the said heating coil are included. The protective frame is configured by a metal material having a low magnetic permeability.
　前記のように構成された本発明に係る第５の観点の誘導加熱炊飯器においては、加熱コイルが発生させる誘導磁界により、保護枠に加熱コイルに流れる電流とは逆向きの電流が流れる。この結果、本発明に係る第５の観点の誘導加熱炊飯器では、保護枠において、加熱コイルが発生させる誘導磁界とは逆向きの誘導磁界が発生して、誘導磁界が互いに打ち消し合うため、保護枠により防磁効果を得ることができる。 In the induction heating rice cooker according to the fifth aspect of the present invention configured as described above, a current opposite to the current flowing in the heating coil flows in the protective frame by the induction magnetic field generated by the heating coil. As a result, in the induction heating rice cooker according to the fifth aspect of the present invention, the protective frame generates an induction magnetic field opposite to the induction magnetic field generated by the heating coil, and the induction magnetic fields cancel each other out. A magnetic shielding effect can be obtained by the frame.
　また、誘導加熱炊飯器において、鍋からはシュテファン＝ボルツマンの法則に従い、温度の４乗に比例した熱エネルギーが放射されるため、炊飯工程で鍋の温度が高温になると熱エネルギーの放射が増加する。しかしながら、本発明に係る第５の観点の誘導加熱炊飯器においては、鍋の外側に保護枠が設けられており、保護枠が低透磁率の金属材料であるため反射率が高く、鍋からの熱エネルギーを反射して、鍋に戻すことが可能となる。その結果、本発明に係る第５の観点の誘導加熱炊飯器は、鍋の加熱効率をさらに向上させることが可能となり、炊飯性能の更なる向上を図ることができる構成を有する。 In addition, in an induction heating rice cooker, heat energy radiated from the pot in accordance with the Stefan-Boltzmann law is proportional to the fourth power of the temperature. Therefore, when the temperature of the pot becomes high in the rice cooking process, the radiation of heat energy increases. . However, in the induction heating rice cooker according to the fifth aspect of the present invention, a protective frame is provided on the outside of the pan, and the protective frame is a low permeability metal material, so the reflectance is high, It is possible to reflect the heat energy and return it to the pan. As a result, the induction heating rice cooker of the 5th viewpoint which concerns on this invention can further improve the heating efficiency of a pan, and has the structure which can aim at the further improvement of rice cooking performance.
　本発明に係る第６の観点の誘導加熱炊飯器においては、前記の第１の観点乃至第５の観点におけるいずれかの態様において、前記本体内に収納された前記鍋と前記加熱コイルとの間に仕切り板を設けている。 In the induction heating rice cooker of the 6th viewpoint which concerns on this invention, in either aspect in the said 1st viewpoint thru | or a 5th viewpoint, Between the said pan accommodated in the said main body and the said heating coil Is provided with a partition plate.
　前記のように構成された本発明に係る第６の観点の誘導加熱炊飯器においては、加熱コイルの損失による発熱を、仕切り板を介して他の部材（鍋など）に伝熱することが可能となる。また、仕切り板を設けることにより、加熱コイルと鍋との間の間隔を所定距離に確実に保持することが可能となる。 In the induction heating rice cooker according to the sixth aspect of the present invention configured as described above, heat generated by the loss of the heating coil can be transferred to another member (such as a pan) via the partition plate. It becomes. Moreover, it becomes possible to hold | maintain the space | interval between a heating coil and a pan | pan at a predetermined distance reliably by providing a partition plate.
　さらに、本発明に係る第６の観点の誘導加熱炊飯器においては、仕切り板が設けられているため、鍋収納部分の底面にある加熱コイルをユーザに対して見えなくすることが可能となり、安全性の確保とともに鍋収納部分のデザイン性（形状）を向上させることができる。 Furthermore, in the induction heating rice cooker of the 6th viewpoint which concerns on this invention, since the partition plate is provided, it becomes possible to make a heating coil in the bottom face of a pot accommodating part invisible to a user, and it is safe. It is possible to improve the design (shape) of the pot storage part as well as ensuring the performance.
　また、本発明に係る第６の観点の誘導加熱炊飯器においては、前記の第５の観点の誘導加熱炊飯器のように保護枠が設けられた場合には、加熱コイルの損失による発熱を、仕切り板を介して保護枠に伝えやすい構成となる。保護枠は金属材料であるため熱伝導率が高く、温度が均一になりやすい構成であるため、本発明に係る第６の観点の誘導加熱炊飯器は、加熱コイルの損失による発熱を、仕切り板および保護枠を介して鍋を均一加熱することが可能となり、炊飯性能の更なる向上を図ることが可能となる。 Moreover, in the induction heating rice cooker of the 6th viewpoint which concerns on this invention, when the protective frame is provided like the induction heating rice cooker of the said 5th viewpoint, the heat_generation | fever by the loss of a heating coil, The configuration is easy to convey to the protective frame via the partition plate. Since the protective frame is a metal material, it has a high thermal conductivity and the temperature is likely to be uniform. Therefore, the induction heating rice cooker according to the sixth aspect of the present invention generates heat due to the loss of the heating coil. And it becomes possible to heat a pan uniformly through a protective frame, and it becomes possible to aim at the further improvement of rice cooking performance.
　以下、本発明の誘導加熱炊飯器に係る実施の形態について、添付の図面を参照しつつ詳細に説明する。なお、本発明の誘導加熱調理器は、以下の実施の形態に記載した誘導加熱調理器の構成に限定されるものではなく、以下の実施の形態において説明する技術的思想と同等の技術的思想に基づいて構成される誘導加熱炊飯器を含むものである。 Hereinafter, embodiments according to the induction heating rice cooker of the present invention will be described in detail with reference to the accompanying drawings. In addition, the induction heating cooker of this invention is not limited to the structure of the induction heating cooker described in the following embodiment, The technical idea equivalent to the technical idea demonstrated in the following embodiment The induction heating rice cooker comprised based on is included.
　（実施の形態１）
　図１は、本発明に係る実施の形態１の誘導加熱炊飯器の側断面図を示すものである。 (Embodiment 1)
FIG. 1 shows a side sectional view of an induction heating rice cooker according to Embodiment 1 of the present invention.
　図１において、本体１は、上面が開口する略円筒状に形成されており、本体１の内部に鍋収納部となる保護枠１０を備えている。この保護枠１０の内部には、内周面に水位線が描かれた鍋２が着脱自在に配置される。また、保護枠１０は、鍋２とともに加熱コイル５を内包するように、本体１の内部に設けられている。保護枠１０は低透磁率の金属材料で構成されている。 In FIG. 1, the main body 1 is formed in a substantially cylindrical shape whose upper surface is open, and includes a protective frame 10 serving as a pot storage portion inside the main body 1. Inside the protective frame 10, a pan 2 having a water level line drawn on its inner peripheral surface is detachably disposed. The protective frame 10 is provided inside the main body 1 so as to enclose the heating coil 5 together with the pot 2. The protective frame 10 is made of a low permeability metal material.
　前記のように、実施の形態１の誘導加熱炊飯器においては、加熱コイル５が発生させる誘導磁界により、保護枠１０には加熱コイル５に流れる電流とは逆向きの電流が流れる。この結果、保護枠１０においては、加熱コイル５が発生させる誘導磁界とは逆向きの誘導磁界が発生するため、加熱コイル５からの磁界を打ち消し合うことになり、保護枠１０は防磁効果を有するものとなる。 As described above, in the induction heating rice cooker of the first embodiment, a current opposite to the current flowing through the heating coil 5 flows through the protective frame 10 due to the induction magnetic field generated by the heating coil 5. As a result, in the protective frame 10, an induction magnetic field opposite to the induction magnetic field generated by the heating coil 5 is generated, so that the magnetic fields from the heating coil 5 cancel each other, and the protective frame 10 has a magnetic shielding effect. It will be a thing.
　また、誘導加熱炊飯器においては、鍋２からはシュテファン＝ボルツマンの法則に従い、温度の４乗に比例した熱エネルギーが放射されるため、後述する炊飯工程において鍋２が高温になると熱エネルギーの放射が増加する。しかし、実施の形態１の誘導加熱炊飯器においては、鍋２の外側に保護枠１０が設けられており、この保護枠１０が低透磁率の金属材料であるため、反射率が高く、鍋２からの熱エネルギーを反射して、鍋に戻している。その結果、実施の形態１の誘導加熱炊飯器においては、低透磁率の金属材料、例えばアルミ材で構成された保護枠１０を設けているため、鍋２の加熱効率が向上しており、炊飯性能の向上が図られている。 In addition, in the induction heating rice cooker, heat energy proportional to the fourth power of temperature is radiated from the pot 2 in accordance with the Stefan-Boltzmann law. Will increase. However, in the induction heating rice cooker of the first embodiment, the protective frame 10 is provided on the outside of the pan 2, and the protective frame 10 is a metal material having a low magnetic permeability. The heat energy from is reflected back to the pan. As a result, in the induction heating rice cooker of Embodiment 1, since the protective frame 10 made of a low magnetic permeability metal material, for example, an aluminum material, is provided, the heating efficiency of the pan 2 is improved, and rice cooking is performed. The performance is improved.
　実施の形態１の誘導加熱炊飯器において、加熱コイル５は、保護枠１０内に収納された鍋２の底面に対向して配設されており、鍋２を加熱するための誘導磁界を発生させるリング状の形状を有している。加熱コイル５の下面には、フェライト１４が備えられており、加熱コイル５が発生する誘導磁界を収束させている。また、鍋２と加熱コイル５との間には、仕切り板１５が設けられている。 In the induction heating rice cooker of the first embodiment, the heating coil 5 is disposed to face the bottom surface of the pan 2 housed in the protective frame 10 and generates an induction magnetic field for heating the pan 2. It has a ring shape. A ferrite 14 is provided on the lower surface of the heating coil 5 to converge the induction magnetic field generated by the heating coil 5. A partition plate 15 is provided between the pan 2 and the heating coil 5.
　図１に示すように、実施の形態１の誘導加熱炊飯器において、仕切り板１５は加熱コイル５と鍋２との間に配設されており、仕切り板１５と加熱コイル５の外周部５ｂの上面（鍋２に対向する面）とは伝熱可能に接触している。また、仕切り板１５は、その外周部分において保護枠１０とも伝熱可能に接触しているため、加熱コイルの損失により発熱した熱エネルギーが仕切り板１５を介して保護枠１０に伝導可能な構成である。 As shown in FIG. 1, in the induction heating rice cooker of the first embodiment, the partition plate 15 is disposed between the heating coil 5 and the pan 2, and the partition plate 15 and the outer peripheral portion 5b of the heating coil 5 are arranged. The upper surface (the surface facing the pan 2) is in contact with the heat transfer. In addition, since the partition plate 15 is in contact with the protective frame 10 so that heat can be transferred at the outer peripheral portion thereof, the heat energy generated by the loss of the heating coil can be transmitted to the protective frame 10 via the partition plate 15. is there.
　実施の形態１の誘導加熱炊飯器において、保護枠１０は低透磁率の金属材料で構成されて、熱伝導率が高く、温度が均一になりやすい特性を有しているため、加熱コイル５の損失による発熱の熱エネルギーが、仕切り板１５および保護枠１０を介して鍋２に伝熱して、当該鍋２に対する均一加熱の補助をすることが可能となり、炊飯性能の更なる向上を図ることができる。 In the induction heating rice cooker according to the first embodiment, the protective frame 10 is made of a metal material with low magnetic permeability, has a high thermal conductivity, and has a characteristic that the temperature tends to be uniform. The heat energy of the heat generated by the loss is transferred to the pan 2 through the partition plate 15 and the protective frame 10, and it becomes possible to assist the uniform heating of the pan 2 and further improve the rice cooking performance. it can.
　前記のように、実施の形態１の誘導加熱炊飯器においては、加熱コイルの損失による発熱が仕切り板１５を介して鍋や保護枠１０などの他の部材に伝熱する構成であるため。仕切り板１５が伝熱部材としても用いられている。なお、実施の形態１の誘導加熱炊飯器においては、仕切り板１５が設けられているため、加熱コイル５と鍋２との間の間隔を所定距離に確実に保持することが可能となる。 As described above, in the induction heating rice cooker according to the first embodiment, the heat generated by the loss of the heating coil is transferred to other members such as the pan and the protective frame 10 through the partition plate 15. The partition plate 15 is also used as a heat transfer member. In addition, in the induction heating rice cooker of Embodiment 1, since the partition plate 15 is provided, it becomes possible to hold | maintain the space | interval between the heating coil 5 and the pan 2 to a predetermined distance reliably.
　さらに、実施の形態１の誘導加熱炊飯器においては、仕切り板１５が設けられているため、鍋収納部の底面にある加熱コイル５をユーザに対して見えなくしており、安全性の確保とともに鍋収納部分のデザイン性（見た目）を向上させている。 Furthermore, in the induction heating rice cooker of Embodiment 1, since the partition plate 15 is provided, the heating coil 5 on the bottom surface of the pan storage portion is not visible to the user, ensuring safety and the pan. The design (look) of the storage part is improved.
　また、本体１の内部には制御部８が設けられており、制御部８はインバータ７を制御し、加熱コイル５に高周波電流を印加することにより、保護枠１０内に収納された鍋２を加熱する。 Moreover, the control part 8 is provided in the inside of the main body 1, and the control part 8 controls the inverter 7 to apply the high frequency current to the heating coil 5, so that the pan 2 housed in the protective frame 10 is removed. Heat.
　本体１の上部には、蓋３が開閉自在に取り付けられている。蓋３は、保護枠１０の後方部分（蓋３の背面側の端部であり、図１における右側端部）にあるヒンジ３ａを中心として回動自在に支持されている。また、蓋３は、回動バネにより、開放するように付勢されている。蓋３におけるヒンジ３ａに対向する他方の端部（図１における左側端部）においては、保護枠１０の前方部分に回動自在に軸支されたフックボタン（図示しない）が配設されており、このフックボタンが蓋３に嵌合して、蓋３が閉成するよう構成されている。即ち、フックボタンが蓋３へ嵌合しているときには、蓋３が開放されることがなくフックボタンに確実に保持されて、鍋収納部は閉塞状態となっている。 A lid 3 is attached to the upper part of the main body 1 so as to be freely opened and closed. The lid 3 is supported so as to be rotatable around a hinge 3a located at a rear portion of the protective frame 10 (the end portion on the back side of the lid 3 and the right end portion in FIG. 1). The lid 3 is urged to be opened by a rotating spring. At the other end (the left end in FIG. 1) of the lid 3 facing the hinge 3a, a hook button (not shown) pivotally supported on the front portion of the protective frame 10 is disposed. The hook button is fitted to the lid 3 so that the lid 3 is closed. That is, when the hook button is fitted to the lid 3, the lid 3 is not held open and is securely held by the hook button, and the pot storage portion is closed.
　蓋３の下部には、炊飯中および保温中において、鍋２内に発生する蒸気を排出するための蒸気口４ｂを有する内蓋４が配設されている。その内鍋４の上部には本体外部と蒸気筒口１１ａにて連通している筒形状の蒸気筒１１が配設されている。 At the bottom of the lid 3, an inner lid 4 having a steam port 4b for discharging steam generated in the pan 2 during rice cooking and heat insulation is disposed. A cylindrical steam tube 11 communicating with the outside of the main body through a steam tube port 11a is disposed at the upper portion of the inner pot 4.
　蒸気筒１１と内蓋４との間には蒸気口パッキン６を配設し、蒸気が蓋３の内部に流入するのを防止している。また、内蓋４の外周部には、鍋２のフランジ部（図示しない）の上面と当接する内蓋パッキン４ａが配設されており、炊飯中および保温中において鍋２内に発生する蒸気が蒸気口４ｂ以外から外部に流出するのを防止している。 A steam port packing 6 is disposed between the steam cylinder 11 and the inner lid 4 to prevent the steam from flowing into the lid 3. In addition, an inner lid packing 4a that is in contact with the upper surface of the flange portion (not shown) of the pan 2 is disposed on the outer peripheral portion of the inner lid 4, and steam generated in the pan 2 during cooking and heat retention. It is prevented from flowing outside from the steam port 4b.
　鍋温度検知部９は、鍋２の底面の略中心部に当接して熱伝導によって鍋２の温度を検知している。蓋温度検知部１２は内蓋４に当接して熱伝導によって鍋２の温度を検知している。 The pan temperature detection unit 9 is in contact with the approximate center of the bottom of the pan 2 and detects the temperature of the pan 2 by heat conduction. The lid temperature detector 12 is in contact with the inner lid 4 and detects the temperature of the pan 2 by heat conduction.
　操作表示部１３は、ユーザによる操作により加熱条件を受け付け、またユーザに対して当該炊飯器の状態などを表示して報知する。 The operation display unit 13 receives a heating condition by an operation by the user, and displays and notifies the user of the state of the rice cooker.
　なお、実施の形態１の誘導加熱炊飯器においては、本体１と蓋３と蒸気筒１１には樹脂ケースを、仕切り板１５には樹脂板を、鍋２には鉄やＳＵＳなどの金属製鍋を、内蓋３には金属製蓋を、内蓋パッキン４ａと蒸気口パッキン６にはゴム製パッキンを、加熱コイル５にはリッツ線を、インバータ７には高周波インバータを、制御部８にはマイクロコンピュータを、鍋温度検知部９と蓋温度検知部１２にはサーミスタを、保護枠１０にはアルミ材を、操作表示部１３にはタッチパネルを用いることにより、容易に構成することができる。 In addition, in the induction heating rice cooker of Embodiment 1, the main body 1, the lid | cover 3, and the steam cylinder 11 have a resin case, the partition plate 15 has a resin plate, and the pan 2 has a metal pan such as iron or SUS. A metal lid for the inner lid 3, a rubber packing for the inner lid packing 4a and the steam port packing 6, a litz wire for the heating coil 5, a high-frequency inverter for the inverter 7, and a high-frequency inverter for the control unit 8. The microcomputer can be easily configured by using a thermistor for the pan temperature detection unit 9 and the lid temperature detection unit 12, an aluminum material for the protective frame 10, and a touch panel for the operation display unit 13.
　図２は、本発明に係る実施の形態１の誘導加熱炊飯器における加熱コイルの平面図と側断面図を示すものである。 FIG. 2 shows a plan view and a side sectional view of a heating coil in the induction heating rice cooker according to the first embodiment of the present invention.
　従来、金属導体を巻いてリング状に形成した加熱コイルにおいては、発生する誘導磁界の磁束が、当該加熱コイルの半径方向におけるコイル周囲に発生する。また、加熱コイルがリング状であるため、内周部は外周部と比べ磁束が集中している。 Conventionally, in a heating coil formed by winding a metal conductor into a ring shape, a magnetic flux of an induced magnetic field is generated around the coil in the radial direction of the heating coil. Moreover, since the heating coil is ring-shaped, magnetic flux is concentrated in the inner peripheral part compared with the outer peripheral part.
　図２において、実施の形態１の誘導加熱炊飯器における加熱コイル５は、撚り線のリッツ線を巻いてリング状に形成したものであり、加熱コイル５の外周部５ｂは内周部５ａと比べて、その高さＬ（図２参照）が高くなるように構成されている。 In FIG. 2, the heating coil 5 in the induction heating rice cooker of Embodiment 1 is formed by winding a twisted litz wire into a ring shape, and the outer peripheral portion 5b of the heating coil 5 is compared with the inner peripheral portion 5a. Thus, the height L (see FIG. 2) is increased.
　リッツ線は撚り線であるため、高さに応じて加熱コイル５の半径方向の幅が変化し、高さが高いと幅は狭くなる。そのため、外周部５ｂは内周部５ａに比べて半径方向の単位長さ当たりの巻き数が多くなる。即ち、外周部５ｂは内周部５ａに比べてコイル密度が高くなる。なお、リッツ線は、細いエナメル線を複数本撚り合わせて形成された銅線であり、高周波電流を導体に流す場合の表皮効果による抵抗増加を防止する効果を有している。 Since the litz wire is a stranded wire, the width in the radial direction of the heating coil 5 changes according to the height, and the width becomes narrower when the height is high. Therefore, the outer peripheral portion 5b has a larger number of turns per unit length in the radial direction than the inner peripheral portion 5a. That is, the outer peripheral portion 5b has a higher coil density than the inner peripheral portion 5a. The litz wire is a copper wire formed by twisting a plurality of thin enamel wires, and has an effect of preventing an increase in resistance due to a skin effect when a high-frequency current is passed through a conductor.
　そのため、内周部５ａと外周部５ｂの高さを変え、適切な高さにすることにより、加熱コイル５が発生する誘導磁界を略均一に発生させることが可能となる。また、加熱コイル５において外周部５ｂの高さをより高くすることにより、当該加熱コイル５が発生する誘導磁界を外側部分に集中させることが可能となる。 Therefore, the induction magnetic field generated by the heating coil 5 can be generated substantially uniformly by changing the heights of the inner peripheral part 5a and the outer peripheral part 5b to an appropriate height. In addition, by increasing the height of the outer peripheral portion 5b in the heating coil 5, the induction magnetic field generated by the heating coil 5 can be concentrated on the outer portion.
　図２に示すように、実施の形態１の誘導加熱炊飯器においては、加熱コイル５における外周部５ｂが、内周部５ａに比べて、鍋２の鉛直方向（図２における上方向）に高さＬを増して、鍋２に対して近づくように構成されている。実施の形態１の誘導加熱炊飯器においては、図２に示すように、加熱コイル５は、平面形状を有しており、内周部５ａと外周部５ｂにおける鉛直方向におけるそれぞれの下面（フェライト１４と接する面）が実質的に同一平面となるように構成されている。一方、内周部５ａと外周部５ｂにおける鉛直方向におけるそれぞれの上面（鍋２に対向する面）においては、前述のように、外周部５ｂが内周部５ａに比べて、鍋２に対して近づくように構成されている。したがって、外周部５ｂと鍋２との空隙（隙間）は、内周部５ａと鍋２との空隙（隙間）より小さくなっており、外周部５ｂと鍋２との間の磁気結合が強くなっている。 As shown in FIG. 2, in the induction heating rice cooker of Embodiment 1, the outer peripheral part 5b in the heating coil 5 is higher in the vertical direction (upward direction in FIG. 2) of the pan 2 than the inner peripheral part 5a. It is configured to increase the length L and approach the pan 2. In the induction heating rice cooker of the first embodiment, as shown in FIG. 2, the heating coil 5 has a planar shape, and the lower surface (ferrite 14) in the vertical direction of the inner peripheral portion 5 a and the outer peripheral portion 5 b. The surface in contact with the surface is substantially the same plane. On the other hand, on each upper surface (surface facing the pan 2) in the vertical direction of the inner peripheral portion 5a and the outer peripheral portion 5b, the outer peripheral portion 5b is compared to the inner peripheral portion 5a with respect to the pan 2, as described above. It is configured to approach. Therefore, the space | gap (gap) of the outer peripheral part 5b and the pan 2 is smaller than the space | gap (gap) of the inner peripheral part 5a and the pan 2, and the magnetic coupling between the outer peripheral part 5b and the pan 2 becomes strong. ing.
　このような構成を用いることにより、加熱コイル５において外周部５ｂは内周部５ａに比べて、鍋２との空隙を狭くして、加熱コイル５と鍋２との磁気結合を向上させて、誘導磁界を加熱コイル５の外側部分に集中させることが可能となる。 By using such a configuration, the outer peripheral portion 5b of the heating coil 5 is narrower than the inner peripheral portion 5a so that the gap between the pan 2 and the heating coil 5 and the pan 2 is improved. It is possible to concentrate the induction magnetic field on the outer portion of the heating coil 5.
　次に、以上のように構成された実施の形態１の誘導加熱炊飯器の動作および作用について説明する。 Next, the operation and action of the induction heating rice cooker of Embodiment 1 configured as described above will be described.
　実施の形態１の誘導加熱炊飯器の炊飯工程は、米に水を吸水させる浸水工程と、一気に鍋内の温度を上げて沸騰させる炊き上げ工程と、沸騰を維持させて米の澱粉を糊化させてご飯にする沸騰維持工程と、炊き上がったご飯を蒸らして鍋内を均一に仕上げるむらし工程とを有しており、各工程における制御方法が制御部８に記憶されている。 The rice cooking process of the induction heating rice cooker according to the first embodiment includes a water immersion process in which water is absorbed by the rice, a cooking process in which the temperature in the pan is increased to a boil, and boiling is maintained to gelatinize the starch of the rice. A boiling maintaining step for making the rice into a boiled rice and an unevenness step for uniformly finishing the inside of the pan by steaming the cooked rice, and a control method in each step is stored in the control unit 8.
　まず、ユーザが鍋２内に所定量の米と水を入れて、鍋２を本体１にセットした後、ユーザが操作表示部１３を用いて炊飯開始の操作を行い、炊飯開始の指令信号が制御部８に送信される。炊飯開始の指令信号を制御部８が受け付けると、制御部８は浸水工程を開始する。 First, after a user puts a predetermined amount of rice and water into the pan 2 and sets the pan 2 on the main body 1, the user performs an operation for starting rice cooking using the operation display unit 13, and a command signal for starting rice cooking is received. It is transmitted to the control unit 8. If the control part 8 receives the command signal of a rice cooking start, the control part 8 will start a water immersion process.
　浸水工程は、米が糊化する温度よりも低温の水に米を浸して、予め米に吸水させることにより、以降の工程において、米の中心部まで十分に糊化できるようにする工程である。 The water immersion process is a process that allows the rice to be sufficiently gelatinized in the subsequent steps by immersing the rice in water at a temperature lower than the temperature at which the rice is gelatinized and preliminarily absorbing the rice. .
　また、浸水工程は、米に含まれるアミラーゼにより澱粉を分解し、グルコースを生成させ、ごはんの甘味を生み出す工程でもある。このため、浸水工程では、所定時間（例えば２０分）、鍋温度検知部９の検知温度が６０℃前後になるよう制御される。 Also, the water soaking process is a process in which starch is decomposed by amylase contained in rice to produce glucose, thereby producing the sweetness of rice. For this reason, in a water immersion process, it controls so that the detection temperature of the pan temperature detection part 9 may be about 60 degreeC for predetermined time (for example, 20 minutes).
　即ち、制御部８は、鍋温度検知部９による温度検知を行い、鍋温度検知部９からの温度検知情報が６０℃以下であれば、インバータ７を動作させて加熱コイル５に高周波電流を印加して、当該鍋２を加熱する。一方、検知温度情報が６０℃以上であれば、インバータ７を動作させて加熱コイル５への電流印加を停止し、当該鍋２の加熱を停止する。 That is, the control unit 8 performs temperature detection by the pan temperature detection unit 9, and if the temperature detection information from the pan temperature detection unit 9 is 60 ° C. or less, operates the inverter 7 to apply a high frequency current to the heating coil 5. Then, the pan 2 is heated. On the other hand, if the detected temperature information is 60 ° C. or higher, the inverter 7 is operated to stop the current application to the heating coil 5 and the heating of the pan 2 is stopped.
　浸水工程開始から所定時間経過すると、炊き上げ工程に移行する。 When a predetermined time has elapsed since the start of the flooding process, the cooking process is started.
　炊き上げ工程では、鍋温度検知部９からの検知温度情報が水の沸点近傍（例えば、１００℃）になるまで鍋２を加熱する。なお、この時、検知温度の時間推移における温度勾配の違いによって被調理物の量、即ち炊飯量を判定することができる。 In the cooking process, the pan 2 is heated until the detected temperature information from the pan temperature detecting unit 9 is close to the boiling point of water (for example, 100 ° C.). At this time, the amount of the cooking object, that is, the amount of cooked rice can be determined based on the difference in temperature gradient in the time transition of the detected temperature.
　鍋温度検知部９からの検知温度情報が所定温度に達すると、沸騰維持工程に移行する。 When the detected temperature information from the pan temperature detector 9 reaches a predetermined temperature, the process proceeds to the boiling maintenance process.
　沸騰維持工程は、米の澱粉を糊化させて、糊化度を５０％～６０％程度まで引き上げる工程である。沸騰維持工程では、鍋２に水がある間は、鍋２内の米及び水が沸騰状態を維持するように、制御部８はインバータ７を動作させて加熱コイル５に高周波電流を印加し、当該鍋２を加熱する。 The boiling maintaining step is a step of gelatinizing the starch of rice to raise the degree of gelatinization to about 50% to 60%. In the boiling maintenance process, the controller 8 operates the inverter 7 to apply a high-frequency current to the heating coil 5 so that the rice and water in the pot 2 maintain a boiling state while the pot 2 has water, The pan 2 is heated.
　この加熱動作において、鍋２内の水が米に吸水され、および蒸発により無くなったとき、鍋２の温度が急激に上昇する。鍋温度検知部９の検知温度が所定温度（例えば、１３０℃）に到達すると、沸騰維持工程を終了し、むらし工程に移行する。 In this heating operation, when the water in the pot 2 is absorbed by the rice and disappears due to evaporation, the temperature of the pot 2 rises rapidly. When the temperature detected by the pan temperature detection unit 9 reaches a predetermined temperature (for example, 130 ° C.), the boiling maintenance process is terminated and the process proceeds to the unevenness process.
　むらし工程は、米の澱粉を糊化させて、糊化度を１００％近くまで引き上げる工程である。むらし工程では、鍋底が焦げるのを避けつつ、ご飯の温度が低下するのを防ぎ、糊化を促進させて鍋２内のご飯を均一化するため、工程中で追い炊き加熱を経過時間に応じて複数回（例えば２回）行い、鍋温度検知部９の温度が所定温度（例えば、８０℃）を保つように、加熱動作の入切を行う。 The unevenness process is a process in which starch of rice is gelatinized to increase the degree of gelatinization to nearly 100%. In the spotting process, while preventing the bottom of the pan from scorching, the temperature of the rice is prevented from lowering, and gelatinization is promoted to make the rice in the pan 2 uniform. In response to this, the heating operation is turned on / off so that the temperature of the pan temperature detection unit 9 is maintained at a predetermined temperature (for example, 80 ° C.).
　以上の各炊飯工程における、鍋２の加熱動作において、加熱コイル５の内周部５ａは鍋２の底面の内側部分に誘導磁界を発生させ、加熱コイル５の外周部５ｂは鍋２の底面の外側部分に誘導磁界を発生させ、それぞれが誘導加熱を行う。 In the heating operation of the pan 2 in each of the above rice cooking steps, the inner peripheral portion 5a of the heating coil 5 generates an induction magnetic field in the inner portion of the bottom surface of the pan 2, and the outer peripheral portion 5b of the heating coil 5 is the bottom surface of the pan 2. An induction magnetic field is generated in the outer portion, and each performs induction heating.
　鍋２の底面の外側部分の熱は鍋２の側面部分へ熱伝達し、鍋２を立体的に加熱する。 The heat of the outer portion of the bottom surface of the pan 2 is transferred to the side portion of the pan 2 to heat the pan 2 three-dimensionally.
　また、加熱コイル５において損失により生じた発熱の熱エネルギーは、フェライト１４を経由して保護枠１０の底面に伝達する。保護枠１０の底面部分の熱は保護枠１０の側面部分へ伝達し、更に鍋２の側面部分へ空気を介して伝達され、鍋２を立体的に加熱する。 Further, the heat energy of heat generated by the loss in the heating coil 5 is transmitted to the bottom surface of the protective frame 10 via the ferrite 14. The heat of the bottom surface portion of the protective frame 10 is transmitted to the side surface portion of the protective frame 10, and further transmitted to the side surface portion of the pan 2 through the air to heat the pan 2 three-dimensionally.
　前記のように、実施の形態１の誘導加熱炊飯器においては、加熱コイル５と保護枠１０をフェライト１４等が熱的に接続されて構成されているため、加熱コイル５において生じる発熱の熱エネルギーが鍋２を立体的に加熱するために用いられ、効率高く鍋２を加熱することができるという優れた効果を有している。 As described above, in the induction heating rice cooker of the first embodiment, since the heating coil 5 and the protective frame 10 are configured by thermally connecting the ferrite 14 and the like, heat energy generated in the heating coil 5 is generated. Is used to heat the pan 2 three-dimensionally, and has an excellent effect that the pan 2 can be heated with high efficiency.
　また、実施の形態１の誘導加熱炊飯器においては、鍋２と保護枠１０との間を密閉する構成とすることにより、断熱効果を有するとともに、鍋２を立体的に加熱することができる構成となる。 Moreover, in the induction heating rice cooker of Embodiment 1, it has the heat insulation effect by setting it as the structure which seals between the pan 2 and the protective frame 10, and the structure which can heat the pan 2 three-dimensionally. It becomes.
　実施の形態１の誘導加熱炊飯器においては、鍋温度検知部９は鍋２の底面の略中心部に当接して熱伝導によって鍋２の温度を検知し、検知した温度から鍋２内の水や米の温度を推測して、各炊飯工程の制御を行っている。 In the induction heating rice cooker of the first embodiment, the pan temperature detection unit 9 abuts on the substantially central portion of the bottom surface of the pan 2 to detect the temperature of the pan 2 by heat conduction, and the water in the pan 2 is detected from the detected temperature. The temperature of rice and rice is estimated and each rice cooking process is controlled.
　一方、従来の誘導加熱調理器において、鍋の中心に加熱が集中するため、鍋温度検知部を鍋の底面の略中心部に当接させて鍋の温度を検知する構成では、鍋の偏った温度を検知することとなり、鍋内の水や米の温度を正確に推測することが困難であり、炊飯性能が低下するという課題があった。 On the other hand, in the conventional induction heating cooker, since heating concentrates at the center of the pan, the configuration in which the pan temperature detection unit is brought into contact with the substantially central portion of the bottom of the pan to detect the pan temperature is biased. The temperature was detected, and it was difficult to accurately estimate the temperature of water and rice in the pan, and there was a problem that rice cooking performance was reduced.
　本発明に係る実施の形態１の誘導加熱炊飯器の構成においては、加熱コイル５が発生する誘導磁界を略均一に発生させることが可能であり、鍋２を均一に加熱させることが可能となる。その結果、実施の形態１の誘導加熱炊飯器の構成においては、鍋２内の水や米の温度を正確に推測することが可能になり、炊飯性能を向上させることができる。 In the configuration of the induction heating rice cooker according to the first embodiment of the present invention, the induction magnetic field generated by the heating coil 5 can be generated substantially uniformly, and the pan 2 can be heated uniformly. . As a result, in the configuration of the induction heating rice cooker of the first embodiment, it becomes possible to accurately estimate the temperature of water or rice in the pan 2 and improve the rice cooking performance.
　なお、実施の形態１の誘導加熱炊飯器の構成においては、加熱コイル５が内周部５ａと外周部５ｂの高さが異なる２つの部分を持つ構成で説明したが、本発明はこのような構成に限定されるものではなく、加熱コイルが高さの異なる複数の部分を持つよう構成し、内周部から外周部に向かって鍋の形状に応じて徐々に高さが高くなるよう構成しても同様の効果が得られる。 In addition, in the structure of the induction heating rice cooker of Embodiment 1, although the heating coil 5 demonstrated in the structure which has two parts from which the height of the inner peripheral part 5a and the outer peripheral part 5b differs, this invention is such It is not limited to the configuration, and the heating coil is configured to have a plurality of parts having different heights, and the height is gradually increased from the inner periphery toward the outer periphery according to the shape of the pan. However, the same effect can be obtained.
　本発明の誘導加熱炊飯器においては、加熱コイルが誘導磁界を所望の状態、例えば略均一に発生させることが可能となり、その結果、当該加熱コイルにより鍋を均一に加熱することが可能となる。したがって、本発明によれば、加熱ムラが抑制され、炊飯性能が向上した炊飯器を提供することができる。 In the induction heating rice cooker of the present invention, the heating coil can generate an induction magnetic field in a desired state, for example, substantially uniformly, and as a result, the pan can be uniformly heated by the heating coil. Therefore, according to this invention, the heating nonuniformity can be suppressed and the rice cooker which the rice cooking performance improved can be provided.
　また、本発明の誘導加熱炊飯器においては、加熱コイルが発生する誘導磁界を鍋の外側に集中させることが可能となる。その結果、本発明によれば、当該鍋の外側を集中して加熱することが可能となり、鍋の底面から側面への熱伝達を加速させて、当該鍋を立体的に加熱し、結果的に鍋を均一に加熱して、炊飯性能を向上させることができる。 Also, in the induction heating rice cooker of the present invention, the induction magnetic field generated by the heating coil can be concentrated outside the pan. As a result, according to the present invention, it becomes possible to concentrate and heat the outside of the pan, accelerate heat transfer from the bottom surface to the side surface of the pan, and heat the pan three-dimensionally. A pot can be heated uniformly and rice cooking performance can be improved.
　さらに、本発明の誘導加熱炊飯器の構成においては、加熱コイルが平面的に構成されているため、加熱コイルの成形、及び支持が容易な構成であり、製造コストを大幅に抑制できる。 Furthermore, in the configuration of the induction heating rice cooker of the present invention, since the heating coil is configured in a planar manner, the heating coil can be easily formed and supported, and the manufacturing cost can be greatly suppressed.
　本発明は、加熱コイルが誘導磁界を所望の状態に発生させることが可能となり、鍋を均一に加熱させることが可能となり、加熱ムラが抑制され、炊飯性能が向上した炊飯器であるとともに、加熱コイルの成形および支持が容易であり安価に製造することができるため、一般家庭、レストランなどで使用される炊飯器として有用である。 The present invention is a rice cooker in which a heating coil can generate an induction magnetic field in a desired state, a pan can be heated uniformly, heating unevenness is suppressed, and rice cooking performance is improved. Since the coil can be easily formed and supported and can be manufactured at low cost, it is useful as a rice cooker used in general households, restaurants and the like.
　１　本体
　２　鍋
　５　加熱コイル
　５ａ　内周部
　５ｂ　外周部
　７　インバータ
　８　制御部
　１０　保護枠
　１５　仕切り板 DESCRIPTION OF SYMBOLS 1 Main body 2 Pan 5 Heating coil 5a Inner peripheral part 5b Outer peripheral part 7 Inverter 8 Control part 10 Protection frame 15 Partition plate

Claims (6)

  1. 　本体と、
    　前記本体内に着脱自在に収納される鍋と、
    　前記鍋の底面に対向して配設され、前記鍋を加熱するための誘導磁界を発生させるリング状の加熱コイルと、
    　前記加熱コイルに高周波電流を印加するインバータと、
    　前記加熱コイルに印加する高周波電流を制御する制御部と、を備え、
    　前記加熱コイルは、内周部と外周部を有し、前記外周部が前記内周部に比べて、鉛直方向の高さが高くなるよう構成された誘導加熱炊飯器。     The body,
    A pan that is detachably stored in the main body;
    A ring-shaped heating coil disposed opposite to the bottom of the pan and generating an induction magnetic field for heating the pan;
    An inverter that applies a high-frequency current to the heating coil;
    A control unit for controlling a high-frequency current applied to the heating coil,
    The heating coil has an inner peripheral part and an outer peripheral part, and the outer peripheral part is an induction heating rice cooker configured such that the height in the vertical direction is higher than that of the inner peripheral part.
  2. 　前記加熱コイルにおいて、前記外周部が前記内周部に比べて前記鍋方向の高さが高く、前記外周部と前記鍋との空隙が、前記内周部と前記鍋との空隙より小さくなるよう構成された請求項１に記載の誘導加熱炊飯器。 In the heating coil, the outer peripheral portion is higher in height in the pan direction than the inner peripheral portion, and the gap between the outer peripheral portion and the pan is smaller than the gap between the inner peripheral portion and the pan. The induction heating rice cooker of Claim 1 comprised.
  3. 　前記加熱コイルは、リッツ線を巻いて成形する請求項１または２に記載の誘導加熱炊飯器。 The induction heating rice cooker according to claim 1 or 2, wherein the heating coil is formed by winding a litz wire.
  4. 　前記加熱コイルは、前記外周部が前記内周部に比べて、半径方向の単位長さ当たりの巻き数が多くなるよう構成された請求項１乃至３のいずれか１項に記載の誘導加熱炊飯器。 The induction heating rice cooker according to any one of claims 1 to 3, wherein the heating coil is configured such that the outer peripheral portion has a larger number of turns per unit length in the radial direction than the inner peripheral portion. vessel.
  5. 　前記本体内に収納された前記鍋と前記加熱コイルとを内包するよう構成された保護枠を備え、前記保護枠が低透磁率の金属材料により構成された請求項１乃至４のいずれか１項に記載の誘導加熱炊飯器。 The protective frame comprised so that the said pan accommodated in the said main body and the said heating coil might be included, The said protective frame was comprised with the metal material of the low magnetic permeability. The induction heating rice cooker described in 1.
  6. 　前記本体内に収納された前記鍋と前記加熱コイルとの間に仕切り板を設けた請求項１乃至５のいずれか１項に記載の誘導加熱炊飯器。 The induction heating rice cooker according to any one of claims 1 to 5, wherein a partition plate is provided between the pan housed in the main body and the heating coil.
PCT/JP2013/000062 2012-01-11 2013-01-10 Induction heating rice cooker WO2013105503A1 (en)

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JPH0548818U (en) * 1991-11-29 1993-06-29 株式会社日立ホームテック Cooker heating coil
JPH07177960A (en) * 1993-12-21 1995-07-18 Hitachi Home Tec Ltd Induced heating rice cooker

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CN112386091A (en) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 Coil panel and pot courage of IH electricity rice cooker

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