WO2013018244A1 - Dispositif de chauffage à micro-ondes - Google Patents

Dispositif de chauffage à micro-ondes Download PDF

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Publication number
WO2013018244A1
WO2013018244A1 PCT/JP2012/001063 JP2012001063W WO2013018244A1 WO 2013018244 A1 WO2013018244 A1 WO 2013018244A1 JP 2012001063 W JP2012001063 W JP 2012001063W WO 2013018244 A1 WO2013018244 A1 WO 2013018244A1
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Prior art keywords
heating
microwave
waveguide
heating chamber
chamber
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PCT/JP2012/001063
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English (en)
Japanese (ja)
Inventor
近藤　龍太
西村　誠
澁谷　昌樹
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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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 CN201280038403.4A priority Critical patent/CN103718645B/zh
Priority to JP2013526711A priority patent/JP6004281B2/ja
Priority to EP12820421.1A priority patent/EP2741575B1/fr
Publication of WO2013018244A1 publication Critical patent/WO2013018244A1/fr

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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
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • 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
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • 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
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • 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
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides

Definitions

  • the present invention relates to a microwave heating apparatus that radiates microwaves to an object to be heated and performs dielectric heating, and more particularly to a cooking device that cooks food that is an object to be heated by dielectric heating.
  • the basic configuration of a heating cooker using microwaves typified by a microwave oven is a heating chamber shielded so that microwaves do not leak outside, a magnetron that generates microwaves, and a magnetron And a waveguide for transmitting the microwave generated in the heating chamber to the heating chamber.
  • the components other than the heating chamber, the magnetron, and the waveguide various configurations are used according to the method according to the purpose. For example, there are a lateral feeding method, a lower feeding method, an upper feeding method, a vertical feeding method, and the like depending on from which direction the microwave is incident on the heating chamber, and the configuration differs depending on these feeding methods. .
  • the food itself that is the object to be heated needs to be rotated in the heating chamber so that the distribution of microwaves is not biased.
  • a so-called turntable method is used in the lateral feeding method.
  • the antenna that is the power feeding unit provided at the coupling portion between the waveguide and the heating chamber is rotated to radiate the microwave.
  • the so-called rotating antenna method for rotating the antenna in this way is used for the lower feeding method, the upper feeding method, and the vertical feeding method.
  • the power supply method to be selected in the microwave oven is determined in consideration of not only the microwave oven function but also other functions such as an oven function, a grill function, and a steam function.
  • an oven function e.g., a grill function
  • a steam function e.g., a steam function
  • the heating chamber becomes high temperature, so that the material for placing the food to be heated is heat resistant.
  • Highly conductive dishes may be used.
  • the microwave is reflected by the conductive dish, so that the microwave in the heating chamber is different from the case where a dielectric dish such as glass or ceramic that transmits microwaves is used. Wave distribution is different.
  • a conductor net may be used instead of a conductor dish.
  • microwaves pass when the mesh is increased to some extent compared to the wavelength, and therefore the microwave distribution in the heating chamber changes depending on the net shape.
  • the food as the object to be heated is a dielectric, so that microwaves can penetrate into the food and heat the food. Is possible.
  • the microwave oven it is possible to set fire inside the food in a short time. Therefore, by cooperating the function of the microwave oven that heats the inside of the food and the function of the heater that bakes the surface of the food, it becomes possible to bake large foods or frozen foods in a short time.
  • the conventional cooking device when performing heating heating using convection heat using hot air or radiant heat that burns the surface of food at the same time as microwave high frequency heating, it is affected by the heating chamber during high temperature heating.
  • the magnetron which is a microwave supply source, has a problem that the temperature rises during operation. In such a case, when the microwave radiated into the heating chamber is not absorbed by the food and the reflected wave reflected by the food is not configured to be suppressed from returning to the power supply unit, In addition, there is a problem that the temperature rise of the magnetron becomes more remarkable due to the self-heating of the magnetron.
  • the heating chamber is made as large as possible and an operation panel is provided above the heating chamber in order to make it easy for the user to operate.
  • the microwave power supply configuration and other configurations for example, a heater drive circuit and a cooling configuration
  • the microwave power supply configuration is disposed above the heating chamber that is at a high temperature, so that the magnetron is likely to receive heat from the heating chamber.
  • FIG. 10 is a front sectional view showing a schematic configuration when a heater power supply configuration having a heater is further provided in a cooking device in which a general microwave feeding configuration is provided on the upper side of the heating chamber.
  • a heating chamber 101 for dielectrically heating a food product 107 that is an object to be heated is provided inside a casing 100 that constitutes the appearance of the heating cooker.
  • a heater 102 is provided at an upper and lower position inside the heating chamber 101.
  • microwave feeding configurations such as a magnetron 103, a waveguide 104, a rotating antenna 105, and a motor 106 are disposed.
  • the microwave radiated from the rotating antenna 105 serving as the power feeding unit irradiates the food 107 serving as the object to be heated.
  • the microwave irradiated with the food 107 approximately 64% of the microwave converted to electric power is reflected on the interface between the air and the food 107 due to the difference in dielectric constant between the air and the food 107.
  • the microwaves reflected in this way are directed from the food 107 to the direction of the rotary antenna 105 vertically above, and are received by the rotary antenna 105 having strong directivity in the vertical direction.
  • the microwave of the reflected wave received by the rotating antenna 105 returns to the magnetron 103 via the waveguide 104, and the magnetron 103 self-heats.
  • the number of microwaves radiated from the rotating antenna 105 reaches the bottom surface of the heating chamber 101 beyond the food 107. Therefore, almost all of the microwaves reaching the bottom surface of the heating chamber 101 are reflected toward the ceiling wall surface of the heating chamber 101, and the reflected waves are received by the rotating antenna 105 provided on the ceiling wall surface.
  • the reflected wave received by the rotating antenna 105 was sent to the magnetron 103 via the waveguide 104, and the magnetron 103 was self-heating.
  • the conventional cooking device configured as described above has a structure in which heat generated in the heating chamber 101 is conducted through the waveguide 104 and is transmitted to the magnetron 103, and the magnetron 103 is easily heated. .
  • the magnetron 103 is configured to easily receive heat from the heating chamber 101 in addition to the heat generated by its own operation, and the magnetron 103 has a problem that the temperature rises. Therefore, in the conventional cooking device, there was a problem that the magnetron 103 failed or its life was shortened. Further, in order to solve these problems, there is a problem that the output must be set low.
  • the conventional cooking device has a problem that the heating efficiency by the microwave is lowered due to the temperature rise of the magnetron 103.
  • the microwave power feeding configuration is arranged in the space above the heating chamber 101, and the magnetron 103 is vertically connected to the upper side of the heating chamber 101 as shown in FIG. As the high temperature air rises, the magnetron 103 is more easily heated, and a considerably high space is required above the heating chamber 101. As a result, there has been a problem that the size of the housing 100 has to be large.
  • the present invention achieves a compact microwave power supply arrangement disposed on the upper side of the heating chamber, provides a small microwave heating apparatus, and increases the temperature of the magnetron due to self-heating by using a power supply structure that hardly receives reflected waves.
  • An object of the present invention is to provide a microwave heating apparatus that suppresses the above, extends the life of the magnetron, has high reliability without lowering the output, and has improved heating efficiency.
  • the microwave heating apparatus of the present invention is A heating chamber for storing an object to be heated and performing high-frequency heating by irradiating the object to be heated with microwaves, A microwave power feeding chamber formed to protrude upward from the ceiling wall surface of the heating chamber, A microwave generating unit for generating microwaves for high-frequency heating the object to be heated in the heating chamber; A waveguide that connects the power supply chamber and the microwave generator to transmit microwaves, and a coupling hole formed in a joint portion between the power supply chamber and the waveguide is provided in a vertical direction.
  • a feeding unit having a vertical axis element formed and a flat element having a radiation surface that is joined to the vertical axis element and emits microwaves to the heating chamber; At least a part of the microwave radiation surface of the flat plate element is inclined with a predetermined angle ⁇ with respect to the horizontal direction.
  • the plate element of the power feeding unit is provided so that the microwave is radiated downward at a predetermined angle ⁇ from the coupling hole of the power feeding chamber provided on the ceiling wall surface of the heating chamber. For this reason, even if a part of the radiated microwave is reflected at the boundary surface with the object to be heated, the reflected wave is reflected in a direction deviated from the power supply unit by an angle ⁇ with respect to the vertical direction. . Therefore, receiving the reflected wave from the object to be heated at the power feeding unit is greatly reduced, and the reflected wave component returning to the microwave generating unit via the waveguide can be greatly suppressed. ing.
  • thermoelectric generation unit temperature rise in the microwave generation unit is prevented, the life of the microwave generation unit is extended, high reliability is achieved without lowering the output, and output efficiency is improved. It is possible to provide a microwave heating apparatus capable of
  • Front sectional drawing which shows the internal structure of the principal part in the heating cooker of Embodiment 1 which concerns on this invention.
  • Front sectional drawing which shows the internal structure of the principal part in the heating cooker of Embodiment 2 which concerns on this invention.
  • Side surface sectional drawing of the principal part in the heating cooker of Embodiment 2 which concerns on this invention.
  • a microwave heating apparatus includes a heating chamber for storing an object to be heated and performing high-frequency heating by irradiating the object to be heated with microwaves, A microwave power feeding chamber formed to protrude upward from the ceiling wall surface of the heating chamber, A microwave generating unit for generating microwaves for high-frequency heating the object to be heated in the heating chamber; A waveguide that connects the power supply chamber and the microwave generator to transmit microwaves, and a coupling hole formed in a joint portion between the power supply chamber and the waveguide is provided in a vertical direction.
  • a feeding unit having a vertical axis element formed and a flat element having a radiation surface that is joined to the vertical axis element and emits microwaves to the heating chamber; At least a part of the microwave radiation surface of the flat plate element is inclined with a predetermined angle ⁇ with respect to the horizontal direction.
  • a coupling hole for supplying microwaves to a portion where the feeding chamber and the waveguide provided on the ceiling wall surface of the heating chamber are joined is provided.
  • the flat plate element of the power feeding unit is provided so that the microwave is radiated downward from the coupling hole at a predetermined angle ⁇ . For this reason, even if a part of the microwave radiated from the power feeding unit is reflected on the boundary surface with the object to be heated, the reflected wave is reflected in a direction whose angle with respect to the vertical direction is shifted from the power feeding unit by ⁇ .
  • the microwave heating apparatus has a structure in which the waveguide is joined to the heating chamber via the power supply chamber, and the waveguide is disposed apart from the heating chamber. For this reason, even if the heating chamber is at a high temperature, the microwave generation unit is less susceptible to heat from the ceiling wall of the heating chamber, and the heat transmitted from the heating chamber through the waveguide to the microwave generation unit is greatly reduced. ing.
  • the microwave heating device has a structure that can reliably prevent the temperature rise of the microwave generation unit.
  • the microwave heating apparatus of the first aspect even if the microwave generation unit is a compact configuration provided above the heating chamber, the temperature increase of the microwave generation unit is suppressed, and the microwave generation unit The lifetime can be extended, and the output efficiency can be improved with high reliability while maintaining a high output without reducing the output of the microwave generator.
  • the microwave heating apparatus is such that at least a part of the radiation surface of the microwave radiation surface of the flat plate element in the first aspect has a predetermined angle ⁇ with respect to the horizontal direction.
  • the area of the radiation surface bent at the predetermined angle ⁇ is configured to be 1/2 or more of the entire radiation surface of the flat plate element.
  • the microwave radiated from the power feeding unit has a strong radiation directivity in a direction perpendicular to the radiation surface of the flat plate element and is bent.
  • the radiation plane set at the angle ⁇ occupies more than half of the whole.
  • the microwave heating apparatus of the second aspect most of the microwaves radiated from the power feeding unit are radiated obliquely by an angle ⁇ with respect to the vertical direction.
  • the microwave radiated obliquely from the radiation surface of the flat plate element is reflected by the heated portion or the like in a direction shifted from the power feeding portion by the oblique amount. Therefore, in the microwave heating apparatus of the second aspect, the power receiving unit receives the reflected wave, and the reflected wave component that returns to the microwave generating unit via the waveguide can be suppressed. It is possible to prevent a temperature rise in the microwave generation unit due to self-heating. As a result, the microwave heating apparatus of the second aspect can extend the life of the microwave generation unit, eliminates the need for power down setting of the microwave generation unit, and can improve output efficiency.
  • the microwave heating apparatus is a high temperature that heats an object to be heated with at least one of radiant heat or convection heat simultaneously with high-frequency heating in the heating chamber of the first or second aspect.
  • a heating unit In the configuration in which the microwave generation unit and the waveguide are disposed above the heating chamber, The waveguide has a horizontal line and a vertical part and has a transmission line bent at a right angle, the microwave generating part is horizontally connected to the vertical part, and the heating chamber is connected to the horizontal part.
  • the power supply chamber provided on the ceiling wall surface of the antenna is connected via a coupling hole, and both the waveguide and the microwave generation unit are disposed apart from the heating chamber.
  • the microwave heating apparatus of the third aspect configured as described above, an object to be heated is placed on a material having a radio wave shielding action such as a metal tray, and high frequency heating and other heating are simultaneously used in combination. Also, the microwave can be supplied downward from the power supply chamber provided on the ceiling wall surface of the heating chamber. For this reason, the microwave heating device of the third aspect can reliably heat the object to be heated without microwaves being shielded. Further, in the microwave heating apparatus of the third aspect, since the microwave is radiated obliquely with respect to the vertical direction from the radiation surface of the flat plate element of the power feeding unit, the reflected wave component returning to the microwave generation unit is suppressed. Therefore, temperature rise due to self-heating can be prevented.
  • a power supply chamber is provided on the ceiling wall of the heating chamber, a waveguide bent at a right angle to the power supply chamber is connected, and both the waveguide and the microwave generator are separated from the ceiling wall of the heating chamber. Since the microwave heating apparatus according to the third aspect is arranged so that the microwave generation part is not easily heated from the ceiling wall surface of the heating chamber during high-temperature heating, the microwave generation is performed from the heating chamber through the waveguide. Heat transmitted to the part is also reduced. For this reason, the microwave heating device of the third aspect can reliably prevent the temperature of the microwave generation unit from rising.
  • the microwave heating apparatus of the third aspect even in a compact configuration in which the microwave generation unit is provided above the heating chamber, heat transfer from the heating chamber to the microwave generation unit is reduced, The life of the wave generation unit can be extended, the power generation setting of the microwave generation unit is unnecessary, and the output efficiency can be improved. Furthermore, in the microwave heating apparatus of the third aspect, since the microwave generator, for example, a magnetron is horizontally connected horizontally to the vertical transmission path of the waveguide, the size in the height direction of the entire apparatus is obtained. Can be made compact.
  • the microwave heating device is the inclination of the radiation surface that is inclined by a predetermined angle ⁇ with respect to the horizontal plane, particularly in all the radiation surfaces of the flat plate element according to any of the first to third aspects.
  • the inclination angle ⁇ rad of the inclined radiation surface is set to an angle larger than Ly / 2 / H and smaller than Ly / H.
  • the inclination angle ⁇ rad of the inclined radiation surface in the flat plate element is larger than Ly / 2 / H (ly / 2 / H ⁇ )
  • the angle is set so that microwaves radiated with a strong radiation directivity in the vertical direction from the radiation surface do not return to the power feeding section even if they are reflected near the bottom of the heating chamber by the object to be heated or the wall surface.
  • the inclination angle ⁇ rad of the inclined radiation surface in the flat plate element is smaller than Ly / H ( ⁇ ⁇ ly / H), the inclination angle is too large, and the microwave is generated near the bottom center of the heating chamber immediately below the vertical axis element.
  • the microwave heating apparatus realizes microwave heating without heating unevenness and suppresses a reflected wave component returning to the microwave generation unit, thereby preventing a temperature increase due to self-heating in the microwave generation unit. And both.
  • the flat plate element according to any of the first to fourth aspects may be constituted by a substantially circular flat plate having a diameter of about 62 mm.
  • the microwave heating apparatus according to the fifth aspect configured as described above is a flat plate element suitable for a microwave heating wavelength such as for a microwave oven, and the flat plate element can reliably resonate at the microwave wavelength.
  • the microwave heating apparatus according to the fifth aspect generates a unidirectional radiation pattern having a central axis of the beam in a direction perpendicular to the radiation surface on the radiation surface of the plate element. Microwaves from the surface are radiated at an angle ⁇ with respect to the vertical direction.
  • the microwave heating device of the fifth aspect since the reflected wave travels in a direction shifted from the power feeding unit by an angle ⁇ of this diagonal portion, in the microwave heating device of the fifth aspect, the power feeding unit is suppressed from receiving the reflected wave, Temperature rise due to self-heating in the microwave generator is prevented.
  • the vertical axis element is joined at a position where the feeding portion in the fifth aspect is eccentric from the center of the disk of the flat element,
  • the vertical axis element may be configured to rotate.
  • microwaves can be uniformly stirred and radiated from the radiation surface of the flat plate element into the heating chamber.
  • the flat plate element according to the fifth or sixth aspect is bent on a straight line including a center line of a disk (a line having a center point of the disk).
  • one radiation surface may be bent at a predetermined angle ⁇ with respect to the other radiation surface.
  • a large amount of microwaves that are inclined by an angle ⁇ with respect to the vertical direction from the radiation surface of the flat plate element can be radiated into the heating chamber. it can.
  • the microwave heating apparatus of the present invention a description will be given using a heating cooker.
  • the heating cooker is an example, and the microwave heating apparatus of the present invention is not limited to the heating cooker.
  • a heating device using dielectric heating which is high frequency heating, a drying device, a heating device for ceramics, a garbage processing machine, or a semiconductor manufacturing device. Therefore, the present invention is not limited to the specific configurations of the following embodiments, but includes configurations based on the same technical idea.
  • Embodiment 1 As Embodiment 1 which concerns on this invention, the heating cooker in a microwave heating apparatus is demonstrated.
  • a microwave oven including at least one heater will be described as an example of the heating means of the heating cooker.
  • FIG. 1 is a front sectional view showing an internal configuration of a main part in a heating cooker as a microwave heating apparatus according to a first embodiment of the present invention.
  • a heating chamber 11 for dielectrically heating (high-frequency heating) a food 15 that is an object to be heated is provided inside a casing 10 that forms the appearance of the cooking device. That is, in the heating chamber 11, the food 15 that is the object to be heated is stored, microwaves are emitted to the food 15, and high-frequency heating is performed.
  • Two upper heaters 12 and a lower heater 13 which are radiant heating portions as high temperature heating portions for raising the temperature in the heating chamber are provided inside the heating chamber 11 formed of a steel plate whose surface is enameled. ing.
  • One upper heater 12 is arranged on the ceiling wall side (upper side) of the heating chamber 11, and the other lower heater 13 is arranged on the bottom wall side (lower side) of the heating chamber 11.
  • a grill 14 formed by combining stainless steel rods vertically and horizontally and welding is provided inside the heating chamber 11.
  • the grill 14 is configured to be mounted at a plurality of desired positions in the heating chamber 11.
  • the food 15 that is an object to be heated placed on the grill 14 is sandwiched between the upper heater 12 and the lower heater 13 and radiantly heated from above and below.
  • the corners of the connecting portions between the wall surfaces constituting the heating chamber 11 are formed by curved surfaces.
  • the entire bottom wall of the heating chamber 11 is formed in a curved shape having a large radius of curvature.
  • the wall surface of the heating chamber 11 demonstrates with the example formed with the steel plate which performed the enamel coating, it forms with the steel plate which applied the coating which has another heat resistance. May be.
  • the wall surface material may be stainless steel or PCM steel plate (Pre-coated metal).
  • the grill 14 is formed by combining stainless steel rods, but can also be formed by using a steel material or the like subjected to plating.
  • a power supply chamber 24 is provided near the center of the ceiling wall surface of the heating chamber 11. Inside the feeding chamber 24, a feeding unit 22 of a rotating antenna as a radio wave stirring unit is arranged.
  • the wall surface of the power supply chamber 24 is made of a material that reflects the microwave radiated from the power supply unit 22, and has a shielding structure so that the microwave does not leak outside the power supply chamber 24.
  • the feeding portion 22 of the rotating antenna is provided in the waveguide 21 so as to be led out from a feeding port 25 which is a coupling hole.
  • the waveguide 21 transmits the microwave from the magnetron 16 that is the microwave generation unit to the power supply unit 22.
  • the magnetron 16 generates microwaves for high-frequency heating of the food 15 that is the object to be heated in the heating chamber 11.
  • the microwave transmitted to the power feeding unit 22 is radiated into the heating chamber 11.
  • the magnetron 16 is disposed at the right end (see FIG. 1) of the waveguide 21 disposed on the upper side of the heating chamber 11, and the magnetron output unit 44 that is an oscillation antenna of the magnetron 16 with respect to the waveguide 21. Is inserted sideways (horizontal direction).
  • one heating means has a dielectric heating section using microwaves, and the other heating means is high-temperature heating by radiation from the upper heater 12 and the lower heater 13. It has a radiation heating part as a part.
  • the heating cooker of Embodiment 1 can perform desired cooking with respect to the foodstuff 15 which is the to-be-heated object in the heating chamber 11 by using together a dielectric heating part and a radiation heating part. It is a configuration.
  • the heating cooker of Embodiment 1 it demonstrates by the structure which has the dielectric heating part by a microwave as one heating means, and has the radiation heating part by the upper heater 12 and the lower heater 13 as another heating means.
  • a convection heating unit that performs cooking by circulating hot air in the heating chamber may be provided.
  • a circulation fan and a circulation heater are provided on the back side of the heating chamber, and the air in the heating chamber is heated to a high temperature and circulated.
  • the cooking device may be configured to perform cooking by providing three heating units, a dielectric heating unit, a radiation heating unit, and a convection heating unit.
  • the upper heater 12 and the lower heater 13 which are radiant heating parts in the heating cooker of Embodiment 1 are configured by sealing a heating wire together with a filler in a metal pipe.
  • An upper heater thermocouple 17 that contacts the surface of the upper heater 12 is provided in the heating chamber 11.
  • the upper heater thermocouple 17 is covered with a metal tube so as not to be affected by the microwave radiated from the power supply unit 22, and functions as a temperature detection unit of the upper heater 12.
  • a lower heater thermocouple 18 that contacts the surface of the lower heater 13 is provided in the heating chamber 11, and has the same configuration as the upper heater thermocouple 17.
  • the lower heater thermocouple 18 functions as temperature detection means for the lower heater 13.
  • a thermistor 19 is fixed to the wall surface of the heating chamber 11 as temperature detecting means in the heating chamber.
  • the upper heater thermocouple 17, the lower heater thermocouple 18, and the thermistor 19 are electrically connected to a control unit 20 that is a control means.
  • the control unit 20 controls the energization amount to the upper heater 12 and the lower heater 13 based on detection signals from the upper heater thermocouple 17, the lower heater thermocouple 18, and the thermistor 19.
  • the heating control for the heating chamber 11 is controlled with high accuracy so that the heating amount becomes the set temperature.
  • the upper heater 12 of the radiant heating section that heats the food 15 that is the object to be heated by radiant heat from above is disposed in a region other than directly below the power supply chamber 24. That is, the upper heater 12 is not directly irradiated by the microwave radiated from the power feeding unit 22 that is the rotating antenna in the power feeding chamber 24, and the food 15 that is the object to be heated is directly irradiated. .
  • the waveguide 21 provided on the upper side of the heating chamber 11 includes a horizontal portion 42 extending in the horizontal direction and a vertical portion 43 extending in the vertical direction. That is, the waveguide 21 is an L-shaped internal passage (transmission) bent at a right angle by a horizontal transmission path (42) formed by the horizontal section 42 and a vertical transmission path (43) formed by the vertical section 43. Road).
  • the magnetron 16 that is a microwave generation unit is inserted and connected to the vertical portion 43 of the waveguide 21 so that the magnetron output unit 44 that is an oscillation antenna is introduced in the horizontal direction. Accordingly, since the magnetron 16 is connected laterally (horizontal connection) with respect to the waveguide 21, the vertical height dimension is such that the magnetron 16 is connected vertically to the waveguide 21 (vertical connection: This is shorter than the case of FIG.
  • the feeding port 25 formed in the horizontal portion 42 (horizontal transmission path) of the waveguide 21 having the L-shaped internal passage (transmission path) is provided with the feeding section 22 that is a rotating antenna.
  • the power feeding unit 22 includes a flat plate element 22a and a vertical axis element 22b.
  • the vertical axis element 22 b of the power feeding unit 22 is connected to the motor 23.
  • the vertical axis element 22b is rotated by driving the motor 23, and the flat plate element 22a is rotated.
  • the power feeding unit 22 is coupled to the horizontal transmission path (42) of the waveguide 21, and the microwave transmitted through the waveguide 21 is stirred and radiated into the heating chamber 11 by the flat plate element 22 a of the power feeding unit 22.
  • a dome-shaped power supply chamber 24 that houses the rotating flat plate element 22a is provided in the approximate center of the ceiling wall surface of the heating chamber 11.
  • the power supply chamber 24 has a shape in which a lower end portion extends in a circular shape, and has a truncated cone shape.
  • the power supply chamber 24 is formed in a truncated cone shape by projecting the ceiling wall surface of the heating chamber 11 outward by drawing.
  • the feeding port 25 formed on the lower surface of the horizontal portion 42 of the waveguide 21 is connected to an opening formed at the upper end of the feeding chamber 24 and functions as a coupling hole.
  • the connecting portion between the power supply unit 22 and the power supply unit 22 has a predetermined diameter as a power supply port.
  • the power supply chamber 24 is provided on the ceiling wall surface of the heating chamber 11 and is configured to reflect the microwave radiated from the flat plate element 22a in the lateral direction (substantially horizontal direction).
  • the flat element 22a is set to resonate at the wavelength of the microwave used and to generate a unidirectional radiation pattern having a central axis of the beam in a direction perpendicular to the radiation surface of the flat element 22a. If even a slight amount of microwave is radiated from the flat plate element 22a in the horizontal direction, it is reflected on the wall surface of the power supply chamber 24.
  • the power supply chamber 24 is open at the lower end portion of the power supply chamber 24 so that the microwave from the flat plate element 22 a is radiated into the heating chamber 11.
  • a cover 27 is provided in an opening portion which is a lower end of the power supply chamber 24 on the ceiling wall surface of the heating chamber 11.
  • the cover 27 is made of mica and is provided so that dirt or the like scattered from the food in the heating chamber 11 does not adhere to the flat plate element 22a of the power supply unit 22 or the like.
  • the cover 27 is detachably attached to an insulator hook 26 provided on the ceiling wall surface of the heating chamber 11.
  • the cover 27 has been described with an example using mica, which is a low-loss dielectric material.
  • the cover 27 is not limited to mica, and the same effect can be obtained by using a material such as ceramic or glass.
  • the upper heater 12 provided in the upper part in the heating chamber 11 is disposed so as not to be directly heated by the microwaves from the power supply unit 22 and directly below the opening portion serving as the lower end of the power supply chamber 24. Since the upper heater 12 is arranged so as to bypass the opening portion of the power supply chamber 24 as described above, a gap portion 28 is formed in the central portion of the upper heater 12. Therefore, the microwave M (see FIG. 1) radiated directly from the power supply unit 22 toward the food 15 is not hindered by the upper heater 12. Thus, in the heating cooker of Embodiment 1, the microwave M radiated
  • FIG. 2 is a perspective view showing the waveguide 21 and the power supply chamber 24 in the cooking device of the first embodiment.
  • the waveguide 21 has a horizontal portion 42 that forms a horizontal transmission path and a vertical portion 43 that forms a vertical transmission path, and an internal passage serving as a transmission path is L-shaped. It has a bent shape that is bent at a right angle. That is, the extending direction (horizontal direction) of the horizontal transmission path (42) and the extending direction (vertical direction) of the vertical transmission path (43) are orthogonal to each other.
  • the waveguide 21 has the horizontal transmission path (42) and the vertical transmission path (43) bent at right angles, and the magnetron 16 serving as the microwave generation unit is horizontally disposed on the vertical transmission path (43). They are connected to transmit the microwave from the magnetron 16 to the horizontal transmission path (42).
  • the distance Lh is set to about 135 mm.
  • the horizontal transmission distance Lh is a horizontal distance along the extending direction (left and right direction in FIG. 1) of the horizontal transmission path from the bending position C in the transmission path in the waveguide 21 to the center of the power supply port 25. It is.
  • the width a of the internal passage that is the transmission path of the waveguide 21 is about 80 mm, and the height b of the internal passage of the horizontal portion 42 of the waveguide 21 is about 16 mm.
  • the width a of the internal passage and the height b of the internal passage in the horizontal portion 42 indicate the dimensions of the transmission path on the inner surface side of the waveguide 21.
  • the magnetron 16 is fixed horizontally and horizontally with respect to the vertical portion 43 of the waveguide 21. That is, the magnetron output portion 44 that is an oscillation antenna of the magnetron 16 is inserted and mounted laterally into the opening 29 formed in the side wall (right side wall) of the vertical portion 43 of the waveguide 21.
  • the vertical transmission distance (length in the vertical direction) from the bending position C to the center of the magnetron output portion 44 of the magnetron 16 is Lv (see FIG. 2)
  • the vertical transmission distance Lv in the first embodiment. Is set to about 15 mm.
  • a magnetron 16 having an oscillation frequency of about 2450 MHz is used.
  • the guide wavelength in the waveguide 21 having the internal passage width a of about 80 mm is ⁇ g
  • ⁇ g is about 190 mm
  • FIG. 3 is a cross-sectional view of a main part showing the power feeding unit 22 and the object to be heated 15 in the heating cooker according to the first embodiment.
  • the flat plate element 22a of the power feeding unit 22 that stirs and radiates the microwave transmitted from the waveguide 21 by rotation thereof is made of metal, has a thickness of 1 mm, and a diameter of 62 mm.
  • the disk has a shape bent by an angle of 10 ° along a folding line including a center line of the disk (a line having the center point of the disk).
  • the vertical axis element 22b that transmits the rotation of the motor 23 to the flat plate element 22a is connected to a position that is eccentric about 12 mm from the center of the disk in the flat plate element 22a.
  • ⁇ 10 °
  • the present invention is not limited to this configuration, The line may not include the center line of the disc.
  • the microwave heating apparatus of the present invention at least a part of the radiation surface of the plate element microwave radiation surface is bent at a predetermined angle ⁇ with respect to the horizontal direction.
  • the area of the radiating surface that has been bent is only required to be 1 ⁇ 2 or more of the entire radiating surface of the flat plate element.
  • the flat plate element 22a has two regions of the horizontal plane portion Ah disposed in the horizontal direction by the fold line and the skew plane portion As that is inclined downward from the fold line by a predetermined angle ⁇ with respect to the horizontal plane. It is divided into.
  • the radiation surface of the oblique surface portion As is set to be the same as the radiation surface of the horizontal surface portion Ah or wider than the radiation surface of the horizontal surface portion Ah (As ⁇ Ah).
  • H is about 330 mm. Therefore, since the skew angle ⁇ rad of the skew surface portion As of the flat plate element 22a is about 0.175, it is set to an angle larger than Ly / 2 / H ⁇ 0.094 and smaller than Ly / H ⁇ 0.188. (Ly / 2 / H ⁇ rad ⁇ Ly / H).
  • the motor 23 side portion is made of fluororesin
  • the flat plate element 22a side portion is made of metal.
  • the metal portion in the vertical axis element 22b includes a portion that enters the inside of the waveguide 21 and a portion that protrudes toward the feeding chamber 24 through the feeding port 25 of the waveguide 21.
  • the gap between the metal portion and the power supply port 25 in the vertical axis element 22b is ensured by a distance of 5 mm or more.
  • c 0.58 ⁇ (wavelength) where c is the diameter of the flat plate element.
  • the resonance frequency including the vertical axis element 22b varies depending on the length and diameter of the vertical axis element 22b, the position on the flat plate element 22a to which the vertical axis element 22b is joined, the accurate resonance frequency has these dimensions and shapes. It is finally decided including.
  • the flat plate element 22a having a diameter of approximately 62 mm resonates, and the horizontal plane portion Ah and the oblique plane portion of the flat plate element 22a are bent by this resonance current.
  • a unidirectional radiation pattern is generated having the central axis of the beam in a direction perpendicular to the respective radiation surface of As.
  • a microwave radiated with a strong radiation directivity from the radiation surface of the oblique surface portion As inclined downward by a predetermined angle ⁇ with respect to the horizontal direction is radiated at an angle ⁇ with respect to the vertical direction.
  • the food 15 has a high water content, and may be considered to be almost equivalent to water in terms of microwaves. Since the relative permittivity of water is about 80, the portion of the microwave incident perpendicularly to the food 15 that is transmitted and absorbed in the food is about 36 in terms of electric power due to the difference from the dielectric constant with air. %, And the remaining 64% is reflected at the interface between the air and the food 15.
  • the feeding port 25 which is a coupling hole for connecting the waveguide 21 to the ceiling wall surface of the heating chamber 11 and supplying microwaves is provided, and this coupling hole portion
  • the flat plate element 22a is arranged so that the microwave is radiated downward at a predetermined angle ⁇ . For this reason, a part of the radiated microwave is reflected at the boundary surface with the food 15 that is the object to be heated. reflect. Therefore, the reception of the reflected wave from the object to be heated by the antenna as the power feeding unit is greatly reduced, and the reflected wave component returning to the magnetron 16 via the waveguide 21 is suppressed.
  • the temperature rise in the magnetron 16 due to self-heating is prevented, the life of the magnetron 16 is extended, the power down setting for the magnetron 16 is not required, and the output efficiency It becomes the structure which can aim at improvement.
  • the microwave radiated from the antenna has a strong radiation directivity in a direction perpendicular to the downward surface with the downward surface of the flat plate element 22a as a radiation surface.
  • the radiation surface of the oblique surface portion As that is bent at the center line of the disk of the flat plate element 22a and set to the bending angle ⁇ occupies 1/2 or more of the entire radiation surface. For this reason, most of the radiated waves from the flat plate element 22a are radiated at an angle ⁇ with respect to the vertical direction.
  • the microwave radiated obliquely with the oblique surface portion As of the flat element 22a as the radiation surface irradiates the object to be heated obliquely, and the direction shifted from the position of the antenna serving as the power feeding portion 22 by the oblique amount. Reflected in. Therefore, in the heating cooker according to the first embodiment, the antenna receives significantly less reflected waves, and the reflected wave components returning to the magnetron 16 can be significantly suppressed. For this reason, the cooking device of Embodiment 1 has a configuration in which the temperature rise in the magnetron 16 due to self-heating is prevented.
  • the waveguide 21 has an L-shape bent at a right angle, and the magnetron 16 is connected to the waveguide 21 in a lateral direction. That is, the magnetron output part 44 of the magnetron 16 is attached so that the lead-out portion of the magnetron 16 is orthogonal to the vertical wall surface of the waveguide 21. For this reason, the vertical dimension (height), which is the vertical direction, of the arrangement space of the waveguide 21 to which the magnetron 16 is bonded becomes small. For example, as compared with the height in the arrangement space of the waveguide 104 in which the magnetron 103 is joined in the vertical direction as in the conventional configuration shown in FIG.
  • the guide in which the magnetron 16 in the first embodiment is joined is used.
  • the height in the arrangement space of the wave tube 21 is small.
  • the magnetron 16 is joined to the waveguide 21 in a lateral direction, there is a margin in the space above the magnetron 16 and other components can be arranged.
  • the heating cooker according to the first embodiment it is possible to form a microwave feeding configuration including the magnetron 16, the waveguide 21, the feeding chamber 24, and the like in a compact manner.
  • an operation panel is provided above the heating chamber, and other configurations such as an electric circuit, a microwave feeding configuration, and a cooling configuration are also integrated above the heating chamber to be compact. It becomes easy to obtain space for mounting.
  • the horizontal portion 42 of the waveguide 21 is connected to the power supply port 25 at the protruding end portion of the power supply chamber 24 projecting upward from the ceiling wall surface of the heating chamber 11, and guided.
  • a vertical portion 43 of the tube 21 extends upward from the bending position C.
  • the waveguide 21 is disposed so as to be away from the ceiling wall surface of the heating chamber 11.
  • the power supply chamber 24 is formed on the ceiling wall surface of the heating chamber 11, and the waveguide 21 is connected to the upper end of the power supply chamber 24. For this reason, the waveguide 21 is coupled to the heating chamber 11 via the power supply chamber 24.
  • the contact portion between the waveguide 21 and the power supply chamber 24 can be reduced in area as compared with the case where the waveguide is brought into direct contact with the ceiling wall surface of the heating chamber.
  • the above can be configured not to contact other members.
  • the waveguide 21 is configured to be separated from the heating chamber 11, and a space is formed between them. For this reason, in the structure of the cooking-by-heating machine of Embodiment 1, it is prevented that heat conduction is carried out directly with respect to the waveguide 21 from the ceiling wall surface of the heating chamber 11 in high temperature heating.
  • the heating cooker of the first embodiment is configured such that the amount of heat conducted from the heating chamber 11 to the magnetron 16 through the power supply chamber 24 and the waveguide 21 is greatly reduced. Furthermore, since the magnetron 16 is arranged so as to be separated from the heating chamber 11, in the heating cooker of the first embodiment, heat conduction from the ceiling wall surface of the heating chamber 11 to the magnetron 16 is prevented. Has been.
  • the magnetron 16 is difficult to receive heat from the ceiling wall surface of the heating chamber 11 during high-temperature heating, and the magnetron passes from the heating chamber 11 through the waveguide 21.
  • the heat transmitted to 16 is reduced, and the temperature rise of the magnetron 16 is prevented.
  • the magnetron 16 is provided above the heating chamber 11, the heat transfer from the heating chamber 11 to the magnetron 16 is reduced, the life of the magnetron 16 is extended, and the power-down setting for the magnetron 16 is set.
  • the output efficiency can be improved.
  • the magnetron 16 that is the microwave generation unit is horizontally connected to the vertical transmission path (43) of the waveguide 21 in the horizontal direction.
  • the size in the vertical direction can be made compact.
  • the horizontal transmission distance Lh (see FIG. 2) in the horizontal portion 42 of the waveguide 21 is set to be long, so that the heating chamber 11 and the waveguide 21 are connected to the heating chamber 11.
  • the amount of heat conducted to the magnetron 16 can be further suppressed. Since the magnetron 16 is generally more efficient at a lower temperature, the output efficiency of the magnetron 16 is improved in the heating cooker of the first embodiment.
  • the heating cooker according to the first embodiment even if the food 15 is placed on a material having a radio wave shielding function such as a metal tray and the radio wave and other heating functions are used at the same time, power is supplied to the ceiling wall portion. Since microwaves can be supplied downward from the chamber 24, the food 15 can be reliably heated by microwaves without being blocked.
  • the microwave is radiated obliquely with respect to the vertical direction from the radiation surface of the oblique surface portion As of the flat plate element 22a, the reflected wave component returning to the magnetron 16 that is the microwave generation unit is greatly suppressed. Temperature rise due to self-heating in the magnetron 16 can be prevented.
  • both the waveguide 21 and the magnetron 16 are configured to be separated from the ceiling wall surface of the heating chamber 11, the amount of heat transferred from the heating chamber 11 during high-temperature heating to the magnetron 16 via the waveguide 21 is greatly increased. Thus, the temperature rise of the magnetron 16 is further prevented.
  • the inclination angle ⁇ rad is larger than Ly / 2 / H (Ly / 2 / H ⁇ rad), it is inclined obliquely from the vertical direction from the radiation surface of the oblique surface portion As of the flat plate element 22a. Even if the microwave radiated with strong radiation directivity is reflected near the bottom of the heating chamber 11 by the food 15 or the wall surface, the angle is set so as not to return to the antenna.
  • the inclination angle ⁇ rad of the radiation surface of the oblique surface portion As is smaller than Ly / H ( ⁇ rad ⁇ Ly / H), the inclination angle of the radiation surface is too large and the vertical heating chamber 11 directly below the antenna It is prevented that microwaves cannot be emitted near the bottom center.
  • the radiation surface is set to a suitable radiation angle.
  • the microwave heating without unevenness of heating is realized, and the reflected wave component returning to the magnetron 16 is greatly suppressed, and the temperature rise due to self-heating in the magnetron 16 is prevented. Can be achieved.
  • the cooking device of Embodiment 1 can extend the life of the magnetron 16, eliminate the need for a power-down setting for the magnetron 16, and improve output efficiency.
  • a flat plate element 22a adapted to the microwave wavelength of 2450 MHz is realized, and the flat plate element 22a is a substantially circular flat plate having a diameter of about 62 mm.
  • the heating cooker according to the first embodiment can resonate at a microwave wavelength of 2450 MHz, and has a unidirectional radiation pattern having a central axis of the beam in a direction perpendicular to the radiation surface of the plate element 22a. appear.
  • the radiated wave from the radiation surface of the oblique surface portion AS of the flat plate element 22a is radiated obliquely by an angle ⁇ with respect to the vertical direction.
  • a ventilation region 21a having a large number of through holes 36a and 36b is formed on the E surface which is the opposite wall surface on both sides of the waveguide 21.
  • FIG. 2 only the ventilation region 21 a composed of a plurality of through holes 36 a on one wall surface is shown.
  • a ventilation region 21a composed of the through hole 36b is formed.
  • the ventilation region 21 a is a wall surface region in which a large number of small through holes 36 a and 36 b having a diameter of about 2 to 5 mm are arranged so that microwaves do not leak outside the waveguide 21.
  • the heating cooker of the first embodiment is configured to improve the microwave heating efficiency by the magnetron 16.
  • the horizontal transmission distance Lh of the horizontal portion 42 of the waveguide 21 is set to be longer than a half wavelength ( ⁇ g / 2), the coupling state between the magnetron 16 and the power feeding portion 22 is set. Can be stabilized, and even when the operation state such as a load change fluctuates, a high efficiency can be maintained.
  • the heat transfer from the heating chamber 11 to the magnetron 16 is suppressed by the waveguide 21 having a long horizontal transmission path, and the temperature rise of the magnetron 16 is prevented even in a compact configuration in which the magnetron 16 is provided above the heating chamber 11. can do.
  • the heating cooker of the first embodiment by setting the vertical transmission distance Lv from the center of the magnetron output portion 44 in the waveguide 21 to the bending position C to be shorter than a quarter wavelength ( ⁇ g / 4). , Transmission efficiency can be improved.
  • the waveguide 21 by setting the vertical transmission distance Lv to 1 ⁇ 4 wavelength or less of the oscillation frequency, the electric field does not reverse in the region from the magnetron output portion 44 to the bent portion including the bent position C. The occurrence of complicated reflections in the transmission path of the waveguide 21 can be prevented.
  • the heating cooker of Embodiment 1 it has the dielectric heating part by a microwave as one heating means, and the high temperature heating part by radiation by the upper heater 12 and the lower heater 13 is used together as another heating means.
  • the present invention is not limited to such a configuration, and a convection heating unit that performs heating cooking by circulating hot air in the heating chamber may be provided as another high-temperature heating unit.
  • the microwave heating device of the present invention may have a configuration in which both a radiation heating unit and a convection heating unit are provided as a high-temperature heating unit together with a dielectric heating unit using a magnetron.
  • the microwave heating apparatus of the present invention configured as described above, the amount of heat conducted from the heating chamber to the magnetron through the power supply chamber and the waveguide is greatly reduced in the configuration of the dielectric heating unit. For this reason, in the microwave heating apparatus of the present invention, even if other heating means are used, the temperature rise of the magnetron can be prevented and the life can be extended.
  • a circle is a kind of ellipse, and even if a flat plate element is elliptical, it is orthogonal to the major axis of the ellipse.
  • a fold line may be formed in the direction to form the horizontal plane portion Ah and the oblique surface portion As. If the overall length (Ly) in the major axis direction on the oblique plane of the flat plate element configured in this way is approximately 1 ⁇ 2 wavelength, the overall length in the major axis direction on the horizontal plane of the flat plate element is skewed.
  • the shape of the flat plate element described here is only in the case of a circle and an ellipse, but the flat plate element may be rectangular in order to be in a resonance state, and further need not be a complete rectangle or ellipse.
  • the flat plate element may be a flat plate having a maximum width on the oblique plane of about 1 ⁇ 2 wavelength and a maximum width on the horizontal plane in the range of about 1 ⁇ 4 wavelength to 3 ⁇ 4 wavelength.
  • Embodiment 2 the heating cooker of Embodiment 2 is demonstrated as an example of the microwave heating device of this invention.
  • the heating cooker according to the second embodiment is greatly different from the heating cooker according to the first embodiment described above in the configuration for supplying microwaves to the heating chamber.
  • FIG. 4 is a front sectional view showing the internal configuration of the main part of the heating cooker according to the second embodiment.
  • FIG. 5 is a side cross-sectional view of the heating cooker shown in FIG. 4.
  • the waveguide 21 that transmits the microwave from the magnetron 16 has a horizontal portion as in the waveguide 21 of the first embodiment. 42 and a vertical portion 43, and is bent into an L shape. That is, the internal passage of the waveguide 21 is constituted by a horizontal transmission path and a vertical transmission path bent at a right angle.
  • the magnetron 16 is connected laterally (horizontal connection) so that the magnetron output portion 44 is inserted in the horizontal direction with respect to the waveguide 21. That is, the lead-out portion of the magnetron output portion 44 is provided so as to be orthogonal to the vertical side surface of the vertical portion 43 of the waveguide 21. Therefore, in the state where the magnetron 16 is connected to the waveguide 21, the vertical dimension, which is the vertical direction, is small as in the configuration of the first embodiment.
  • the feeding portion 22 that is an antenna having the flat plate element 22a and the vertical axis element 22b is connected to the horizontal portion 42 of the waveguide 21 having the L-shaped internal passage (transmission path).
  • a power supply chamber 49 that houses the flat plate element 22a is formed at a substantially central portion of the ceiling wall surface of the heating chamber 11.
  • the power supply chamber 49 has a shape in which a lower end portion extends in a circular shape, and has a truncated cone shape.
  • the power supply chamber 49 is formed by drawing the ceiling wall surface of the heating chamber 11.
  • FIG. 6 is a perspective view showing the waveguide 21 and the feeding chamber 49 in the heating cooker according to the second embodiment.
  • the horizontal transmission distance Lh of the horizontal portion 42 is about 135 mm, as in the waveguide 21 of the first embodiment, and the half wavelength ( ⁇ g / 2) is set longer (Lh> ⁇ g / 2).
  • the vertical transmission distance Lv (see FIG. 2) of the vertical portion 43 of the waveguide 21 is about 15 mm, and is set shorter than a quarter wavelength ( ⁇ g / 4) (Lv ⁇ g / 4).
  • the width a of the internal passage that is the transmission path of the waveguide 21 is 80 mm as in the first embodiment.
  • the oscillation frequency of the magnetron 16 is about 2450 MHz
  • the in-tube wavelength ⁇ g in the waveguide 21 whose internal passage width a is about 80 mm is about 190 mm
  • the bottom part of the lower end portion of the power supply chamber 49 protrudes into the heating chamber 11 and serves as a shielding wall protruding downward from the ceiling wall surface of the heating chamber.
  • the upper end portion of the power supply chamber 49 protrudes upward from the ceiling wall surface of the heating chamber 11.
  • the power supply port 25 formed in the horizontal portion 42 of the waveguide 21 is connected to an opening formed in the upper end portion of the power supply chamber 49 and functions integrally as a coupling hole. For this reason, the waveguide 21 is connected to the heating chamber 11 via the power supply chamber 49. Therefore, the contact portion between the waveguide 21 and the power supply chamber 49 can be reduced in area as compared with the case where the waveguide is brought into direct contact with the ceiling wall surface of the heating chamber.
  • the above can be configured not to contact other members.
  • the waveguide 21 is configured to be separated from the heating chamber 11, and a space is formed between them. For this reason, direct heat conduction from the ceiling wall surface of the heating chamber 11 during high-temperature heating to the waveguide 21 is prevented.
  • a heat insulating portion 50 formed of a heat insulating material is provided so as to surround the power supply chamber 49. Thus, since the heat insulation part 50 is provided, the discharge
  • the heat insulating portion 50 is disposed in a space between the waveguide 21 and the ceiling wall surface of the heating chamber 11, so that the waveguide 21 is not directly heated by the heat released from the ceiling wall surface of the heating chamber 11. It is configured. Therefore, the amount of heat conducted from the heating chamber 11 during high temperature heating to the magnetron 16 via the waveguide 21 is greatly suppressed. Furthermore, since the magnetron 16 is also configured to be separated from the heating chamber 11, direct heat conduction from the ceiling wall surface of the heating chamber 11 is prevented.
  • a disc having a diameter of 62 mm is placed in the power supply chamber 49 at a predetermined angle ⁇ (for example, 10) at a folding line including its center line (a line having the center point of the disc).
  • a flat plate element 22a having a shape bent at (°) is provided. The flat element 22a is set to resonate at the wavelength of the microwave used and to generate a unidirectional radiation pattern having a central axis of the beam in a direction perpendicular to the radiation surface of the flat element 22a.
  • the microwave is radiated downward from the radiation surface of the flat plate element 22a of the power feeding unit 22 provided in the coupling hole portion of the ceiling wall surface of the heating chamber 11, and a part of the microwave is perpendicular to the vertical direction. Radiated with a predetermined angle ⁇ . A part of the radiated microwave is reflected at the boundary surface with the food 15 that is the object to be heated, but this reflected wave is reflected in a direction shifted from the feeding unit 22 that is the antenna by an angle ⁇ with respect to the vertical direction. . Therefore, the reception of the reflected wave by the antenna is greatly reduced, and the reflected wave component returning to the magnetron 16 via the antenna can be suppressed. As a result, in the heating cooker according to the second embodiment, the temperature rise in the magnetron 16 due to self-heating is prevented together with the temperature rise due to heat transfer from the heating chamber 11 described above.
  • the heating cooker of the second embodiment even if the magnetron 16 is provided in a compact configuration above the heating chamber 11, the life of the magnetron 16 is extended, the power-down setting of the magnetron 16 is unnecessary, and the output efficiency Can be improved.
  • the horizontal transmission distance Lh of the horizontal portion 42 of the waveguide 21 is set to be longer than a half wavelength ( ⁇ g / 2), the coupling state between the magnetron 16 and the power feeding unit 22 is stabilized, and the operation state such as a load change is achieved. Even if it fluctuates, it becomes the composition which can maintain high heating efficiency.
  • the heat transfer from the heating chamber 11 to the magnetron 16 is suppressed by the waveguide 21 having a long horizontal transmission path, and the temperature of the magnetron 16 can be increased even in a compact configuration in which the magnetron 16 is provided above the heating chamber 11. It becomes the structure which can be prevented.
  • the heating cooker of the second embodiment by setting the vertical transmission distance Lv from the center of the magnetron output portion 44 in the waveguide 21 to the bending position C to be shorter than 1 ⁇ 4 wavelength ( ⁇ g / 4).
  • the oscillation efficiency can be improved.
  • the waveguide 21 by setting the vertical transmission distance Lv to 1 ⁇ 4 wavelength or less of the oscillation frequency, the electric field does not reverse in the region from the magnetron output portion 44 to the bent portion including the bent position C. The occurrence of complicated reflections in the transmission path of the waveguide 21 can be prevented. As a result, in the cooking device of the second embodiment, the oscillation efficiency is greatly improved.
  • the waveguide 21 is bent in an L shape, and the power supply chamber 49 protrudes upward from the ceiling wall surface of the heating chamber 11.
  • the heat insulation part 50 can be provided in the space between the horizontal part 42 of the waveguide 21 and the ceiling wall surface of the heating chamber 11.
  • the heating chamber 11 and the waveguide 21 are coupled via the power supply chamber 49, and the heat insulating portion 50 that prevents heat conduction is provided in the space between the heating chamber 11 and the waveguide 21.
  • the ceiling wall surface of the heating chamber 11 is provided by providing the waveguide 21 bent upward at the upper end portion of the power supply chamber 49 protruding from the ceiling wall surface of the heating chamber 11. It is possible to secure a space for providing the heat insulating portion 50 on the wall, and to lay the heat insulating portion 50 thick.
  • the heating cooker of Embodiment 2 is provided with a ventilation fan 61 that exhausts the heating chamber and a lamp 62 that serves as illumination in the heating chamber.
  • the heat insulating unit 50 releases the heat upward from the heating chamber 11. The heat is shut off.
  • the heating cooker of Embodiment 2 is the structure which can aim at the significant improvement of heating efficiency.
  • the cooking device of the second embodiment has a configuration that significantly suppresses the amount of heat conducted from the heating chamber 11 to the magnetron 16 in the case of cooking in which dielectric heating is coupled with radiation heating and convection heating by a heater. ing. For this reason, the cooking device of Embodiment 2 becomes a cooking device which is compact and has high heating efficiency.
  • the heating cooker according to the second embodiment In the configuration of the heating cooker according to the second embodiment, as shown in FIGS. 4 and 5, an upper heater 12 is provided on the upper side in the heating chamber 11, and is below the bottom wall of the heating chamber 11. A lower heater 13 is provided on the side. Moreover, in the heating cooker of Embodiment 2, the bottom wall of the heating chamber 11 is heated by the lower heater 13. Furthermore, the heating cooker according to the second embodiment has a back heater 30 and a circulation fan 31 for circulating hot air for oven cooking on the back side of the heating chamber 11 (see FIG. 5). Thus, the heating cooker of Embodiment 2 is the structure which can heat a foodstuff directly by radiant heat and convection heat besides the heating by dielectric heating. Therefore, the heating cooker according to the second embodiment is a cooker having a high function capable of supporting a plurality of cooking menus.
  • the upper heater support 51 is configured to hold the upper heater 12 with a degree of freedom so as to cope with the thermal expansion of the upper heater 12.
  • the material of the upper heater support 51 is made of a ceramic such as an insulator according to the required heat resistance temperature, and a material that has a smaller influence on the microwave than the metal fitting is used.
  • the lower end portion of the power supply chamber 49 protrudes from the ceiling wall surface inside the heating chamber 11, and the upper heater 12 is disposed around the lower end portion of the power supply chamber 49. That is, the upper heater 12 is provided to avoid a position directly below the opening at the lower end portion of the power supply chamber 49.
  • the upper heater 12 is provided outside the shielding wall, which is the lower end portion of the power supply chamber 49 projecting from the heating chamber, it is not directly heated by the microwave from the power supply unit 22. The loss of microwave heating is prevented.
  • FIG. 7 is a layout diagram showing the lower surface side of the ceiling wall surface of the heating chamber 11, and shows the power feeding unit 22, the power feeding chamber 49, the upper heater support 51, the upper heater 12 and the like provided on the ceiling wall surface.
  • the upper side is the front side of the apparatus.
  • the upper heater 12 is disposed so as to avoid the opening at the lower end portion of the power supply chamber 49, and is held movably by the upper heater support 51 at a plurality of locations.
  • the lower heater 13 provided below the bottom wall of the heating chamber 11 is configured to heat the bottom wall of the heating chamber 11.
  • the bottom wall of the heating chamber 11 is heated by the lower heater 13 to generate radiant heat and convection heat inside the heating chamber 11.
  • the back heater 30 for circulating hot air and the circulation fan 31 for cooking the oven are provided on the back side of the heating chamber 11, and a convection heating unit is configured.
  • the convection heating unit is configured to heat the air inside the heating chamber 11 by the heat generated by the back heater 30 and the rotation of the circulation fan 31 so that the hot air circulates inside the heating chamber 11.
  • the heating cooker according to the second embodiment is configured so that hot air circulates inside the heating chamber 11 and heats the food 15 that is the object to be heated by the convection heating unit configured as described above.
  • a door 32 for opening and closing is provided on the front side, and opening and closing of the object to be heated with respect to the heating chamber 11 by opening and closing the door 32. Is configured to do.
  • an operation unit 33 is provided on the upper portion of the door 32 for setting various conditions for cooking.
  • a gap 34 is formed between the door 32 and the operation unit 33.
  • the gap 34 constitutes a cooling passage for discharging cooling air from the cooling fan 35 provided at a rear position in the upper space of the heating chamber 11. Cooling air from the cooling fan 35 flows in contact with the upper surface of the heat insulating portion 50 and passes through the small through holes 36a and 36b formed on opposite wall surfaces of the waveguide 21 and exhausts forward from the gap 34.
  • the small through holes 36a and 36b are holes having a size that does not allow microwaves to leak, for example, a diameter of 2 to 5 mm.
  • the ventilation region 21c having the through holes 36a and 36b (see FIG.
  • the heating cooker according to the second embodiment by providing the cooling fan 35 and the cooling passage, the cooling fan 35 is driven and heated even when the heating chamber becomes hot due to, for example, oven cooking.
  • the ceiling wall surface of the chamber 11 can be cooled from the outside.
  • the heating cooker of Embodiment 2 can prevent the temperature rise of the various components which comprise the control part 20 grade
  • the heating cooker according to the second embodiment has a configuration in which a temperature rise is unlikely to occur even when component mounting arranged on the upper side of the ceiling wall surface of the heating chamber 11 is performed at a high density. For this reason, it becomes possible for the heating cooker of Embodiment 2 to be set as a compact structure as the whole apparatus.
  • the cooling fan 35 can forcibly flow cooling air through the cooling passage communicating with the through holes 36 a and 36 b of the waveguide 21.
  • the heating cooker of Embodiment 2 has improved the cooling effect of the magnetron 16 and the waveguide 21, and the temperature rise of the magnetron 16 is achieved even in a compact configuration in which the magnetron 16 is provided above the heating chamber 11. Therefore, the life of the magnetron 16 can be extended, the power-down setting for the magnetron 16 is not required, and the output efficiency can be improved.
  • the microwave heating efficiency by the magnetron 16 is improved in the configuration of the heating cooker of the second embodiment.
  • the lower end portion of the power supply chamber 49 is configured to protrude into the heating chamber 11, and the upper heater 12 is disposed on the outer periphery of the lower end portion of the power supply chamber 49. Since the upper heater 12 is arranged in this way, the microwave radiated from the power supply unit 22 is directly radiated to the food 15 and is not blocked by the upper heater 12. Thus, in the configuration of the second embodiment, since the upper heater 12 does not block the microwave from the power feeding unit 22, the microwave from the power feeding unit 22 heats the upper heater 12 and is lost. Thus, the heating efficiency is improved.
  • the protruding portion of the power supply chamber 49 into the heating chamber 11 functions as a microwave shielding wall.
  • This shielding wall is comprised with the material which shields the microwave radiated
  • the heating cooker of Embodiment 3 is demonstrated as an example of the microwave heating device of this invention.
  • the heating cooker according to the third embodiment is greatly different from the heating cookers according to the first and second embodiments described above in the configuration for supplying microwaves to the heating chamber.
  • the configuration of the first embodiment or the second embodiment is applied to other configurations.
  • the plate element 22a of the power feeding unit 22 that stirs and radiates the microwave transmitted from the waveguide 21 is made of metal, has a thickness of 1 mm, and has a disk shape with a diameter of 62 mm.
  • a direction corresponding to the Y direction on a horizontal plane is defined as an X direction. That is, the angle ⁇ between the X direction and the Y direction is 10 °.
  • H is about 330 mm. Therefore, since the inclination angle ⁇ rad of the flat plate element 22a is about 0.175, it is set to an angle larger than Ly / 2 / H ⁇ 0.094 and smaller than Ly / H ⁇ 0.188 (Ly / 2). / H ⁇ rad ⁇ Ly / H).
  • the motor 23 side portion is made of fluororesin
  • the flat plate element 22a side portion is made of metal.
  • the metal portion in the vertical axis element 22b includes a portion that enters the inside of the waveguide 21 and a portion that protrudes toward the feeding chamber 24 through the feeding port 25 of the waveguide 21.
  • the gap between the metal portion and the power supply port 25 in the vertical axis element 22b is ensured by a distance of 5 mm or more.
  • the flat plate element 22a is arranged so that the microwave is radiated downward at a predetermined angle ⁇ . A part of the light is reflected at the boundary surface with the food 15 that is the object to be heated. Therefore, the reception of the reflected wave from the object to be heated by the antenna serving as the power feeding unit is greatly reduced, and the reflected wave component returning to the magnetron 16 via the waveguide 21 is suppressed. As a result, in the configuration of the heating cooker shown in FIG. 8, the temperature rise in the magnetron 16 due to self-heating is prevented, the life of the magnetron 16 is extended, the power-down setting of the magnetron 16 is unnecessary, and the output efficiency is improved. Can be achieved.
  • FIG. 9 shows still another configuration of the heating cooker according to the third embodiment.
  • the bending line in the flat plate element 22 a of the power feeding unit 22 is configured by a curved surface.
  • the flat plate element 22a of the power feeding unit 22 that stirs and radiates the microwave transmitted from the waveguide 21 is made of metal, has a thickness of 1 mm, and a diameter of 62 mm. It is a disk.
  • the flat plate element 22a has a shape in which the center line of the disk is symmetrical and bent at the center line portion by a curved surface. That is, the flat element 22a shown in FIG. 9 is divided into two regions at the center line portion of the disk, and the two regions are connected by a curved surface.
  • ⁇ 10 °
  • the flat element 22a which is a disc having a diameter of 62 mm, when the length of all radiation surfaces in the Y direction is Ly, the angle ⁇ is small, so the length Ly in the Y direction may be considered to be about 62 mm.
  • the inclination angle ⁇ rad of the flat plate element 22a is about 0.175, it is set to an angle larger than Ly / 2 / H ⁇ 0.094 and smaller than Ly / H ⁇ 0.188. (Ly / 2 / H ⁇ rad ⁇ Ly / H).
  • the motor 23 side portion is made of fluororesin
  • the flat plate element 22a side portion is made of metal.
  • the metal portion in the vertical axis element 22b includes a portion that enters the inside of the waveguide 21 and a portion that protrudes toward the feeding chamber 24 through the feeding port 25 of the waveguide 21.
  • the gap between the metal portion and the power supply port 25 in the vertical axis element 22b is ensured by a distance of 5 mm or more.
  • the flat plate element 22a is arranged so that the microwave is radiated downward at a predetermined angle ⁇ . A part of the light is reflected at the boundary surface with the food 15 that is the object to be heated. Therefore, the reception of the reflected wave from the object to be heated by the antenna as the power feeding unit is greatly reduced, and the reflected wave component returning to the magnetron 16 via the waveguide 21 is suppressed.
  • the configuration of the heating cooker shown in FIG. 9 the temperature rise in the magnetron 16 due to self-heating is prevented, the life of the magnetron 16 is extended, the power-down setting of the magnetron 16 is unnecessary, and the output efficiency is improved. Can be achieved.
  • the heating cooker according to the third embodiment since the power feeding unit 22 is provided with the flat plate element 22a that radiates the microwave at a predetermined angle ⁇ downward, by receiving the reflected wave with the antenna, The reflected wave component returning to the magnetron 16 can be greatly suppressed. As a result, the heating cooker according to the third embodiment prevents the temperature rise in the magnetron 16 due to self-heating, and exhibits substantially the same characteristics and functions as the configuration of the first embodiment described above. The life can be extended, the power down setting for the magnetron 16 is not required, and the output efficiency can be greatly improved.
  • microwaves are radiated downward at a predetermined angle ⁇ from the coupling hole portion of the ceiling wall surface of the heating chamber. Since the flat plate element is arranged as described above, the reflected wave of the radiated microwave at the boundary surface with the object to be heated is reflected in a direction shifted from the antenna by an angle ⁇ with respect to the vertical direction. Therefore, receiving the reflected wave again by the antenna is reduced, and the reflected wave component returning to the microwave generation unit can be greatly suppressed. As a result, the microwave heating device of the present invention can prevent a temperature rise in the microwave generation unit due to self-heating. Further, the microwave heating device of the present invention can extend the life of the microwave generator even if the microwave generator has a compact configuration provided above the heating chamber. Power-down setting is unnecessary, and the output efficiency can be greatly improved.
  • the present invention is not limited to a heating cooker that radiates microwaves to food and heats it in a dielectric manner, particularly a heating cooker that is used in combination with other heating such as an oven, grill, and superheated steam, as well as a drying device, a heating device for ceramics, It is useful in a microwave heating apparatus in various industrial applications such as a garbage disposal machine or a semiconductor manufacturing apparatus.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

L'invention porte sur un dispositif de chauffage à micro-ondes, lequel dispositif comprend une unité d'alimentation en énergie (22) qui émet des micro-ondes et qui comporte ce qui suit : un élément d'arbre vertical (22b) qui est disposé dans une direction verticale par la pénétration d'un trou de couplage (25) formé dans une zone où une chambre d'alimentation en énergie (24) et un guide d'ondes (21) sont reliés ; et un élément de plaque (22a) qui est relié à l'élément d'arbre vertical et qui comporte une surface d'émission pour émettre des micro-ondes vers la chambre de chauffage. Au moins une partie de la surface d'émission de micro-ondes de l'élément de plaque est disposée de façon à être en oblique selon un angle prescrit par rapport à la direction horizontale.
PCT/JP2012/001063 2011-08-04 2012-02-17 Dispositif de chauffage à micro-ondes WO2013018244A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280038403.4A CN103718645B (zh) 2011-08-04 2012-02-17 微波加热装置
JP2013526711A JP6004281B2 (ja) 2011-08-04 2012-02-17 マイクロ波加熱装置
EP12820421.1A EP2741575B1 (fr) 2011-08-04 2012-02-17 Dispositif de chauffage à micro-ondes

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JP2011170690 2011-08-04
JP2011-170690 2011-08-04

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WO2013018244A1 true WO2013018244A1 (fr) 2013-02-07

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JP2016145682A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 乾燥焼成装置及び乾燥焼成方法
JP2016145680A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 マイクロ波・ヒータ併用乾燥機及び被乾燥物の乾燥方法
JP2016145681A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 マイクロ波乾燥機及び被乾燥物の乾燥方法
JP2017096609A (ja) * 2015-11-27 2017-06-01 東芝ホームテクノ株式会社 加熱調理器

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JP6374710B2 (ja) * 2014-06-05 2018-08-15 日立アプライアンス株式会社 加熱調理器
JP6459123B2 (ja) * 2014-12-22 2019-01-30 パナソニックＩｐマネジメント株式会社 マイクロ波加熱装置
US10993295B2 (en) 2015-09-30 2021-04-27 Corning Incorporated Microwave mode stirrer apparatus with microwave-transmissive regions
EP3479653B1 (fr) * 2016-07-01 2021-04-07 Electrolux Appliances Aktiebolag Système d'alimentation en micro-ondes
TWI614457B (zh) * 2017-01-24 2018-02-11 Bottle Top Machinery Co Ltd 腔體可分離之模組化複合微波加熱系統
TWI841549B (zh) 2018-02-08 2024-05-11 國立研究開發法人產業技術總合研究所 微波加熱方法、微波加熱裝置及化學反應方法
CN108662632B (zh) * 2018-03-27 2020-04-24 西安智财全技术转移中心有限公司 一种智能微波炉控制系统
CN111033127B (zh) * 2018-05-21 2021-12-17 松下知识产权经营株式会社 微波处理装置
JP7329736B2 (ja) * 2019-02-13 2023-08-21 パナソニックＩｐマネジメント株式会社 高周波加熱装置
CN212708125U (zh) * 2020-07-30 2021-03-16 广东永畅兴精密制造股份有限公司 微波增强型挤出机装置及有机反应模组

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JP2016145682A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 乾燥焼成装置及び乾燥焼成方法
JP2016145680A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 マイクロ波・ヒータ併用乾燥機及び被乾燥物の乾燥方法
JP2016145681A (ja) * 2015-02-09 2016-08-12 西光エンジニアリング株式会社 マイクロ波乾燥機及び被乾燥物の乾燥方法
JP2017096609A (ja) * 2015-11-27 2017-06-01 東芝ホームテクノ株式会社 加熱調理器

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EP2741575B1 (fr) 2017-05-17
JP6004281B2 (ja) 2016-10-05
EP2741575A4 (fr) 2015-01-07
JPWO2013018244A1 (ja) 2015-03-05
CN103718645A (zh) 2014-04-09
EP2741575A1 (fr) 2014-06-11
TW201309098A (zh) 2013-02-16

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