EP2597930A1 - Mikrowellenheizvorrichtung - Google Patents

Mikrowellenheizvorrichtung Download PDF

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Publication number
EP2597930A1
EP2597930A1 EP11809411.9A EP11809411A EP2597930A1 EP 2597930 A1 EP2597930 A1 EP 2597930A1 EP 11809411 A EP11809411 A EP 11809411A EP 2597930 A1 EP2597930 A1 EP 2597930A1
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EP
European Patent Office
Prior art keywords
heating
microwave
waveguide
heating chamber
propagation path
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP11809411.9A
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English (en)
French (fr)
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EP2597930B1 (de
EP2597930A4 (de
Inventor
Ryuta Kondo
Koji Yoshino
Hiroshi Fukuda
Makoto Nishimura
Masaki Shibuya
Daisuke Hosokawa
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Panasonic Holdings Corp
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Panasonic Corp
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Publication of EP2597930A4 publication Critical patent/EP2597930A4/de
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Classifications

    • 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
    • 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
    • H05B6/642—Cooling of the microwave components and related air circulation systems
    • 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
    • H05B6/701—Feed lines using microwave applicators
    • 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

Definitions

  • Such heating cookers have employed various structures according to the system suitable for the aim, as components other than the heating chamber, the magnetron and the waveguide which have been described above.
  • various structures according to the system suitable for the aim, as components other than the heating chamber, the magnetron and the waveguide which have been described above.
  • lateral feeding systems there have been lateral feeding systems, downward feeding systems, upward feeding systems and upward-and-downward feeding systems, depending on the direction in which microwaves should be incident to the heating chamber.
  • downward feeding systems downward feeding systems
  • upward feeding systems upward-and-downward feeding systems
  • One heater 12 is placed near the ceiling surface (in the upper side) of the heating chamber 11, while the other heater 13 is placed near the bottom surface (in the lower side) of the heating chamber 11.
  • a roasting grid 14 formed from stainless-steel rod members which are longitudinally and laterally coupled and welded to one another.
  • the roasting grid 14 can be mounted at desired positions in a plurality of stages in the heating chamber 11.
  • the food 15 as the object to be heated, which is placed on the roasting grid 14, is sandwiched between the upper heater 12 and the lower heater 13 and is radiatively heated thereby in upper and lower directions.
  • the corners of the bonding portions between the respective wall surfaces forming the heating chamber 11 are formed to have curved surfaces.
  • the bottom surface of the heating chamber 11 is formed to have a curved-surface shape having a larger radius of curvature, in its entirety.
  • the waveguide 21 provided on the upper side of the heating chamber 11 is constituted by a horizontal part 42 extended in the horizontal direction, and a vertical part 43 extended in the vertical direction.
  • the waveguide 21 includes an internal passage (propagation path) having an orthogonally-folded L-shape which is constituted by a horizontal propagation path (42) formed by the horizontal part 42, and a vertical propagation path (43) formed by the vertical part 43.
  • the magnetron output part 44 as the oscillation antenna is inserted in the horizontal direction into the vertical part 43 of the waveguide 21, so that the magnetron 16 as the microwave creating part is coupled thereto.
  • Fig. 2 is a perspective view illustrating the waveguide 21 and the antenna room 24 in the heating cooker according to the first embodiment.
  • the waveguide 21 includes the horizontal part 42 forming the horizontal propagation path, and the vertical part 43 forming the vertical propagation path, wherein the internal passage forming the propagation path has a folded shape which is folded orthogonally in an L shape. Namely, the direction in which the horizontal propagation path (42) extends (the horizontal direction) is orthogonal to the direction in which the vertical propagation path (43) extends (the vertical direction).
  • the width a of the internal passage, which is the propagation path in the waveguide 21, is about 80 mm, and the height b of the internal passage in the horizontal part 42 in the waveguide 21 is about 16 mm. Further, the width a of the internal passage and the height b of the internal passage in the horizontal part 42 indicate the lengths of the propagation path in the inner-surface side of the waveguide 21.
  • the upper heater 12 provided at an upper portion within the heating chamber 11 is placed so as not be beneath the opening part at the lower end of the antenna room 24, in order that the upper heater 12 is not directly heated by microwaves from the feeding part 22.
  • the upper heater 12 is placed in such a way as to evade the opening part in the antenna room 24, thereby forming a vacant part 28 at the center portion of the upper heater 12. Accordingly, microwaves M (see Fig. 1 ) radiated directly toward the food 15 from the feeding part 22 are not obstructed by the upper heater 12.
  • the heating cooker according to the first embodiment is adapted to prevent the upper heater 12 from being directly heated by microwaves radiated from the feeding part 22, which prevents occurrences of losses, thereby improving the heating efficiency.
  • the waveguide 21 is orthogonally folded to have an L shape, and the magnetron 16 is coupled, in a lateral orientation, to the waveguide 21.
  • the magnetron output part 44 in the magnetron 16 is mounted to the vertical wall surface of the waveguide 21, such that its protruded portion is orthogonal thereto. This reduces the space within which there is placed the waveguide 21 to which the magnetron 16 is coupled, in vertical size (the height) in the upward and downward direction. For example, in comparison with the height of the space within which there is placed the waveguide 104 to which the magnetron 103 is vertically coupled in the structure illustrated in Fig.
  • the space within which there is placed the waveguide 21 to which the magnetron 16 is coupled according to the first embodiment has a reduced height. Further, since the magnetron 16 is coupled, in a lateral orientation, to the waveguide 21, there is leeway in the space above the magnetron 16, which enables placing other structural members.
  • the heating cooker according to the first embodiment it is possible to compactly form the microwave feeding structure constituted by the magnetron 16, the waveguide 21, the antenna room 24 and the like.
  • the horizontal part 42 of the waveguide 21 is coupled to the opening in the protruding end portion of the antenna room 24 protruded upwardly from the ceiling surface of the heating chamber 11, and the lower end portion of the vertical part 43 of the waveguide 21 is placed on the ceiling surface of the heating chamber 11.
  • the length of the heightwise size K (see Fig. 2 ) of the vertical part 43 in the waveguide 21 is set so as to cancel the protruding size L (see Fig. 1 ) of the antenna room 24.
  • the protruding size K of the vertical part 43 and the heightwise size L of the antenna room 24 are set to have substantially the same length. Since the antenna room 24 is placed within the heightwise size of the waveguide 21 having the L shape, as described above, the protruding size L of the antenna room 24 is cancelled by the heightwise size K of the waveguide 21 in the upward and downward direction. Further, since the magnetron 16 which is laterally oriented is placed within the heightwise size of the waveguide 21, the antenna room 24 and the magnetron 16 are placed substantially within the heightwise size of the waveguide 21.
  • the heating cooker according to the first embodiment it is possible to eliminate wasted spaces in the microwave feeding structure, thereby attaining compaction thereof.
  • the vertical part 43 of the waveguide 21 is provided proximally to the bottom edge (the lower end portion) of the antenna room 24, which enables compaction of the microwave feeding structure without increasing the size of the microwave feeding structure in the leftward and rightward direction (the direction of the extension of the horizontal part 42), even through the magnetron 16 is placed in a lateral orientation.
  • the antenna room 24 is formed in the ceiling surface of the heating chamber 11, and the waveguide 21 is coupled to the upper end portion of the antenna room 24. Therefore, the waveguide 21 is coupled to the heating chamber 11 with the antenna room 24 interposed between the waveguide 21 and the heating chamber 11. This allows the waveguide 21 and the antenna room 24 to come in contact with each other over a smaller area than that in cases where the waveguide is directly in contact with the ceiling surface of the heating chamber. Further, a space is formed between the waveguide 21 and the heating chamber 11, which prevents direct heat conduction to the waveguide 21 from the ceiling surface of the heating chamber 11 during heating at higher temperatures. Further, a significantly-reduced amount of heat is conducted from the heating chamber 11 to the magnetron 16 through the antenna room 24 and the waveguide 21.
  • the heating cooker according to the first embodiment by setting the horizontal propagation path H (see Fig. 2 ) in the horizontal part 42 of the waveguide 21 to be larger, it is possible to further reduce the amount of heat conducted from the heating chamber 11 to the magnetron 16 through the antenna room 24 and the waveguide 21. This can further improve the output efficiency of the magnetron 16, since the magnetron 16 exhibits higher efficiency at lower temperatures in general.
  • a heat insulation part 50 made of a heat insulation material is provided in such a way as to surround the periphery of the antenna room 49. Since the heat insulation part 50 is provided as described above, it is possible to suppress heat dissipation in the upward direction from the ceiling surface of the heating chamber 11.
  • the heat insulation part 50 is placed in the space between the waveguide 46 and the ceiling surface of the heating chamber 11, which prevents the waveguide 46 from being directly heated by heat dissipated through the ceiling surface of the heating chamber 11. This can largely reduce the amount of heat conducted from the heating chamber 11 to the magnetron 16 through the waveguide 46, during heating at higher temperatures.
  • the heating cooker according to the second embodiment is structured to largely improve the heating efficiency of the magnetron 16.
  • the heating cooker according to the second embodiment by setting the vertical propagation distance V to the folding position C from the center of the magnetron output part 44 in the waveguide 46 to be shorter than 1/4 the wavelength ( ⁇ g/4), it is possible to improve the oscillation efficiency. Further, by setting the vertical propagation distance V to be equal to or less than 1/4 the wavelength corresponding to the oscillation frequency, in the waveguide 46, it is possible to prevent occurrences of electric fields in the opposite direction within the area from the magnetron output part 44 to the folding portion including the folding position C, which can prevent occurrences of complicated reflections within the propagation path in the waveguide 46. As a result thereof, the heating cooker according to the second embodiment can have largely improved oscillation efficiency.
  • the waveguide 46 is shaped to be folded in an L shape, and the antenna room 49 is protruded upwardly from the ceiling surface of the heating chamber 11.
  • This enables provision of the heat insulation part 50 in the space between the horizontal part 47 of the waveguide 46 and the ceiling surface of the heating chamber 11. Accordingly, it is possible to provide the heat insulation part 50 for preventing heat conduction in the space between the heating chamber 11 and the waveguide 46, since the heating chamber 11 and the waveguide 46 are coupled to each other with the antenna room 49 interposed therebetween. Since the heat insulation part 50 is provided as described above, it is possible to form the heating cooker with excellent heating efficiency and with a compact structure.
  • the heating cooker according to the second embodiment is structured such that an upper heater 12 is provided at an upper portion within the heating chamber 11, and a lower heater 13 is provided under the bottom surface wall of the heating chamber 11. Further, the heating cooker according to the second embodiment is structured to heat the bottom surface wall of the heating chamber 11 through the lower heater 13. Further, the heating cooker according to the second embodiment includes a back-surface heater 30 and a circulation fan 31 for circulating hot air flows for oven cooking, near the back surface of the heating chamber 11. As described above, the heating cooker according to the second embodiment is enabled to directly heat food through radiant heat and convective heat, in addition to heating through induction heating. Accordingly, the heating cooker according to the second embodiment forms a sophisticated cooker capable of coping with a plurality of cooking menus.
  • the lower end portion of the antenna room 49 is protruded into the heating chamber 11 from the ceiling surface, and the upper heater 12 is placed around the lower end portion of the antenna room 49.
  • the upper heater 12 is provided so as not be beneath the opening part at the lower end portion of the antenna room 49.
  • the upper heater 12 is provided outside the shield wall formed by the lower end portion of the antenna room 49 protruded into the heating chamber. Therefore, the upper heater 12 is prevented from being directly heated by microwaves from the feeding part 22. This can prevent occurrences of losses in microwave heating.
  • the heating cooker according to the second embodiment is provided, at its front surface side, with a door 32 for opening and closing it, which enables taking in and out the object to be heated into and from the heating chamber 11 by opening and closing the door 32.
  • a manipulation part 33 for making settings of various conditions and the like for heating cooking.
  • a gap 34 is formed between the door 32 and the manipulation part 33.
  • the gap 34 forms a cooling passage for exhausting cooling air flows from a cooling fan 35, which is provided at a back position in the space above the heating chamber 11. Cooled air flows from the cooking fan 35 flow while coming in contact with the upper surface of the heat insulation part 50, further pass through small through holes 36a and 36b formed in the opposite wall surfaces of the waveguide 46 which are faced to each other and, further, are exhausted in the forward direction through the gap 34.
  • the small through holes 36a and 36b are holes having a size which prevents leakages of microwaves through the small through holes 36a and 36b, such as a diameter of 2 to 5 mm, for example. Accordingly, cooling air flows from the cooling fan 35 are caused to cool the heat insulation part 50 and, further, caused to flow through the waveguide 46 to cool the waveguide 46.
  • the heating cooker according to the second embodiment is provided with the cooling fan 35 and the cooling passage and, therefore, is capable of cooling the ceiling surface of the heating chamber 11 from the outside, by driving the cooling fan 35, even when the inside of the heating chamber has been raised to higher temperatures during oven cooking, for example. Therefore, the heating cooker according to the second embodiment is capable of preventing temperature rises in various types of components which constitute the control part 20 and the like, which are placed above the ceiling surface of the heating chamber 11. Further, the heating cooker according to the second embodiment is adapted to suppress temperature rises therein, even in cases of densely mounting and placing components above the ceiling surface of the heating chamber 11. Therefore, the heating cooker according to the second embodiment can be structured compactly, in the entirety of the apparatus.
  • the antenna room 49 is structured to protrude into the heating chamber 11 at its lower end portion, and the upper heater 12 is placed around the outer periphery of the lower end portion of the antenna room 49. Since the upper heater 12 is placed as described above, microwaves radiated from the feeding part 22 are radiated directly to the food 15 and, thus, are not interrupted by the upper heater 12. Thus, with the structure according to the second embodiment, the upper heater 12 is prevented from interrupting microwaves from the feeding part 22, which can prevent microwaves from the feeding part 22 from heating the upper heater 12 to induce losses therein. This can improve the heating efficiency.
  • the portion of the antenna room 49 which protrudes into the heating chamber 11 functions as a microwave shield wall.
  • This shield wall is made of a material which interrupts microwaves radiated from the antenna part 22a. Therefore, microwaves radiated in substantially-horizontal directions from the feeding part 22 as the rotational antenna are certainly interrupted by the shield wall, which prevents the upper heater 12 and the upper-heater supporting tools 51 provided around the antenna room 49 from being directly heated by microwaves from the feeding part 22. Namely, the shield wall reflects microwaves from the antenna part, which prevents these microwaves from directly heating the radiant heating part in the upper heater 12 placed around the outer peripheral portion of the antenna room 49.
  • the heating cooker according to the second embodiment is adapted to largely suppress microwave losses and, thus, is enabled to perform heating cooking on food as objects to be heated, with higher heating efficiency.
  • the heating cooker according to the third embodiment is largely different from the heating cookers according to the first and second embodiments, in terms of the structure for supplying microwaves to a heating chamber.
  • the structures according to the first and second embodiments are applied to the other structures in the heating cooker according to the third embodiment.
  • Fig. 6 is a front cross-sectional view illustrating the microwave feeding structure in the heating cooker according to the third embodiment.
  • an upper heater 12 is placed so as to be housed within a concave part 52, wherein the concave part 52 is formed by outwardly (upwardly) protruding a portion of the ceiling surface 37 of the heating chamber 11.
  • An antenna room 53 provided on the upper side of the heating chamber 11 is structured to have a square planar shape, which is the shape of its lower end portion and, further, to have a rectangular-parallelepiped shape in its entirety.
  • On the upper end portion of the antenna room 53 there is provided an L-shaped waveguide 21 having a horizontal part 42 and a vertical part 43.
  • a feeding port 25 in the horizontal part 42 in the waveguide 21 is coupled to an opening in the protruding end portion of the antenna room 53 which is protruded upwardly from the ceiling surface 37 of the heating chamber 11, and the lower end portion of the vertical part 43 in the waveguide 21 is placed on the ceiling surface 37 (the concave part 52) of the heating chamber 11 in such a way as to interpose a slight gap between a lower end face of the vertical part 43 and an upper face of the ceiling surface 37.
  • the heightwise size of the vertical part 43 of the waveguide 21 is set, in length, in such a way as to cancel the protruding portion of the antenna room 53.
  • a magnetron output part 44 as an oscillation antenna is inserted in the horizontal direction into the vertical part 43 of the waveguide 21, so that a magnetron 16 is coupled thereto. Accordingly, the magnetron 16 is coupled in a lateral orientation (coupled horizontally) to the waveguide 21, so that its heightwise size in the vertical direction is smaller than that in a case where the magnetron is coupled longitudinally (coupled vertically) to the waveguide.
  • the heating cooker according to the third embodiment is provided with ventilation areas 21a including pluralities of through holes 36a and 36b, in the opposite wall surfaces of the waveguide 21 which are faced to each other.
  • Fig. 6 illustrates only the ventilation area 21a formed from the plurality of the through holes 36a in one of the wall surfaces, there is also formed the ventilation area 21a formed from the plurality of through holes 36b (see Fig. 4 ), similarly, in the other wall surface which is faced to the one wall surface.
  • the ventilation areas 21a are areas in the wall surfaces in which there are arranged the pluralities of small through holes 36a and 36b with a diameter of about 2 to 5 mm, in order to prevent leakages of microwaves to the outside of the waveguide 21.
  • the heating cooker according to the third embodiment is structured to further improve the microwave heating efficiency of the magnetron 16, since the magnetron 16 exhibits higher efficiency at lower temperatures in general.
  • the heating cooker according to the third embodiment can be provided with a cooling fan 35 and a cooling passage as described in the second embodiment, which enables cooling the waveguide 21 and, further, cooling the ceiling surface of the heating chamber 11 from the outside, by driving the cooling fan 35, even when the inside of the heating chamber 11 has been raised to higher temperatures during oven cooking, for example.
  • the heating cooker according to the third embodiment since the upper heater 12 is provided within the concave part 52 in the ceiling surface 36, the upper heater 12 is placed at a position at the same height as that of the lower end portion of the antenna room 53 or at a greater height than that of the lower end portion. This can eliminate a wasted space in the upward and downward size in the heating space under the antenna room 53, thereby compacting the entire apparatus. Further, since the upper heater 12 is placed at the same height as that of the lower end portion of the antenna room 53 or at a greater height than the lower end portion, it is possible to prevent the upper heater 12 from obstructing microwaves radiated from the feeding part 22 as the rotational antenna toward the food therebelow. Accordingly, the heating cooker according to the third embodiment is adapted to prevent microwaves from the feeding part 22 from directly heating the upper heater 12 to induce losses therein. Therefore, the heating cooker according to the third embodiment is capable of performing heating cooking of food with higher efficiency.
  • the concave part 52 at a portion of a wall surface of the heating chamber 11 can also have an inner surface shape having such an angle as to reflect radiant heat from the upper heater 12 toward the food, as illustrated in Fig. 6 .
  • the planar shape of the antenna room 53 can be any shape which does not interfere with the rotation of the antenna part 22a and can also be an elliptical shape, a polygonal shape or a combination thereof, as well as a circular shape or a square shape.
  • the heating cooker according to the fourth embodiment is largely different from the heating cookers according to the first to third embodiments, in terms of the structure for supplying microwaves to a heating chamber.
  • the structures according to the first or second embodiment are applied to the other structures in the heating cooker according to the fourth embodiment.
  • Fig. 7 is a front cross-sectional view illustrating the microwave feeding structure in the heating cooker according to the fourth embodiment.
  • an upper heater 12 is housed within a concave part 52 which is formed by outwardly (upwardly) protruding a portion of a ceiling surface 37 of the heating chamber 11.
  • An antenna room 53 provided in the upper side of the heating chamber 11 has a square planar shape at its lower end portion and, further, the antenna room 53 has a rectangular-parallelepiped shape in its entirety.
  • the fourth embodiment will be described with respect to an example where the antenna room 53 has a square planar shape at its lower end portion, but the shape thereof is not limited in the present invention and can also be other shapes, such as circular shapes, polygonal shapes and the like.
  • an L-shaped waveguide 46 having a horizontal part 47 and a vertical part 48.
  • the vertical part 48 is extended to protrude upwardly from the horizontal part 47, similarly to in the waveguide 46 according to the second embodiment.
  • a magnetron 16 is coupled in a lateral orientation (horizontally coupled) to the vertical part 48 of the waveguide 46, such that a magnetron output part 44 is inserted the vertical part 48 in the horizontal direction.
  • the antenna room 53 is formed such that its upper end portion is protruded upwardly from the ceiling surface 37 of the heating chamber 11.
  • a feeding port 25 formed in the horizontal part 47 of the waveguide 46 is coupled to an opening formed in the upper end portion of the antenna room 53. Therefore, the waveguide 46 is coupled to the heating chamber 11 with the antenna room 53 interposed between the waveguide 46 and the heating chamber 11.
  • the waveguide 46 is fixed only to the antenna room 53 and, thus, is adapted to be supported by the antenna room 53.
  • the waveguide 46 and the magnetron 16 are placed in such a way as to interpose a space with a predetermined length between them and the ceiling surface 37 of the concave part 52 which houses the upper heater 12. Due to this placement, cooling air flows from a cooling fan 35 in a back side of the apparatus are caused to flow through the space between the ceiling surface 37 and the waveguide 46 and through the space between the ceiling surface 37 and the magnetron 16, similarly to in the second embodiment. This inhibits heat from the upper heater 12 from being conducted to the magnetron 16, which prevents temperature rises in the magnetron 16. This improves the microwave heating efficiency of the magnetron 16, since the magnetron 16 exhibits higher efficiency at lower temperatures, in general.
  • air flows are blown from the cooling fan 35 (see Fig. 4 ) through the ventilation areas 46a into the waveguide 46 which communicates with the heating chamber 11, which maintains the pressure within the waveguide 46 higher than the pressure within the heating chamber 11. Due to the provision of this pressure difference, it is possible to prevent intrusions of greasy fumes and the like from the heating chamber 11 into the space housing the control part 20 and the like which are placed above the ceiling surface 37 of the heating chamber 11. Furthermore, heat generated from the magnetron 16 during microwave heating is transferred to the heating chamber 11, which realizes a structure having higher heating efficiency.
  • the heating cooker according to the fifth embodiment is largely different from the heating cookers according to the first to fourth embodiments, in terms of the structure for supplying microwaves to a heating chamber.
  • the structures according to the first or second embodiment are applied to the other structures in the heating cooker according to the fifth embodiment.
  • the microwave feeding structure is formed such that an antenna room 54 is provided within the heating chamber 11 and, thus, the microwave feeding structure has a significantly-compacted structure.
  • an antenna-room structural member 54a having a cylindrical shape is secured to the ceiling surface 37 of the heating chamber 11 to form the antenna room 54.
  • the antenna-room structural member 54a functions as a wall for interrupting microwaves radiated in substantially-horizontal directions from an antenna part 22a in a feeding part 22, which prevents microwaves from the feeding part 22 from directly heating an upper heater 12 and upper-heater supporting tools 51 (see Fig. 5 ) which are provided around the outer periphery of the antenna room 54.
  • the planar shape of the antenna room 54 is not limited to a circular shape and can also be a square shape, a rectangular shape, other polygonal shapes, and the like.
  • the heating cooker according to the fifth embodiment is structured such that the antenna room 54 is not protruded upwardly from the heating chamber 11, and such that the horizontal part 47 of the waveguide 46 is provided on the upper surface of the ceiling surface 37 of the heating chamber 11, and the vertical part 48 of the waveguide 46 is upwardly extended. Further, a heat insulation part for intercepting heat can be also provided between the horizontal part 47 of the waveguide 46 and the ceiling surface 37 of the heating chamber 11, in order to inhibit heat from the heating chamber 11 from being conducted to the waveguide.
  • the heating cooker according to the fifth embodiment is not provided with a cover which covers the lower end portion of the antenna room 54, which prevents the occurrence of slight dielectric losses in such a cover, thereby further improving the heating efficiency.
  • the antenna room 54 is constituted by the antenna-room structural member 54a provided on the ceiling surface 37 of the heating chamber 11, and the antenna-room structural member 54a is placed between the antenna room 54 and the upper heater 12 to function as a shield wall for interrupting microwaves radiated in substantially-horizontal directions from the antenna part 22a.
  • microwaves radiated from the feeding part 22 within the heating chamber 11 inhibits microwaves radiated from the feeding part 22 within the heating chamber 11 from being influenced by the presence or absence of members around the feeding part 22 within the heating chamber and from being influenced by the shapes and placement of members around the feeding part 22. Due to the provision of the antenna room 54, microwaves radiated from the feeding part 22 are prevented from directly heating the upper heater 12, which reduces losses thereof in the upper heater 12, thereby enabling heating the object to be heated, with higher efficiency.
  • the heating cooker according to the sixth embodiment is largely different from the heating cookers according to the first and second embodiments, in terms of the structure for supplying microwaves to a heating chamber.
  • the structures according to the first or second embodiment are applied to the other structures in the heating cooker according to the sixth embodiment.
  • a magnetron 16 is placed in the space between a waveguide 21 and an antenna room 53.
  • an upper heater 12 is placed so as to be housed within a concave part 52, wherein the concave part 52 is formed by outwardly protruding a portion of a ceiling surface 37 of the heating chamber 11.
  • the antenna room 53 provided in the upper side of the heating chamber 11 is structured to have a square planar shape, which is the shape of its lower end portion and, further, to have a rectangular parallelepiped shape in its entirety.
  • On the upper end portion of the antenna room 53 there is provided an L-shaped waveguide 21 having a horizontal part 42 and a vertical part 43.
  • a feeding port 25 formed in the lower surface of the horizontal part 42 in the waveguide 21 is coupled to an opening in the protruding end portion of the antenna room 53.
  • the lower end portion of the vertical part 43 in the waveguide 21 is placed above the concave part 52 in the ceiling surface 37 of the heating chamber 11 in such a way as to interpose a space therebetween. Accordingly, in the sixth embodiment, the waveguide 21 is coupled to only the antenna room 53 and, thus, is supported only by the antenna room 53.
  • a magnetron output part 44 is inserted in the horizontal direction into the side surface of the vertical part 43 of the waveguide 21 which is faced to the antenna room 53, so that the magnetron 16 is coupled (horizontally coupled) thereto. Accordingly, the magnetron 16 is placed in the space sandwiched between the antenna room 53 and the vertical part 43 of the waveguide 21.
  • the heating cooker according to the sixth embodiment is provided with ventilation areas 21a including pluralities of small through holes 36a and 36b, in the opposite wall surfaces of the waveguide 21 which are faced to each other, similarly to in the third embodiment ( Fig. 6 ).
  • the formation of these ventilation areas 21a induces movement of air through the waveguide 21, which exerts a cooling effect thereon. This results in reduction of heat conducted from the heating chamber 11 to the magnetron 16 through the waveguide 21.
  • the magnetron output part 44 in the magnetron 16 which is inserted into the waveguide 21 is surrounded by the ventilation areas 21a, which causes the magnetron output part 44 to be cooled by cooling air flows passing through the ventilation areas 21a.
  • the heating cooker according to the sixth embodiment is structured to include the waveguide 21 which is orthogonally folded in an L shape, such that the vertical part 43 of the waveguide 21 is extended downwardly in the vertical direction, and the magnetron 16 is provided in the space between the waveguide 21 and the antenna room 53. Therefore, in the structure of the heating cooker according to the sixth embodiment, the magnetron 16 is placed within the range of the horizontal part 42, in the direction of the extension of the horizontal part 42 in the waveguide 21. Accordingly, the heating cooker according to the sixth embodiment is adapted to effectively utilize the space above the heating chamber 11, which eliminates wasted spaces and attains compaction of the heating cooker.
  • the heating cooker according to the sixth embodiment even when the horizontal propagation distance H (see Fig. 2 ) in the horizontal part 42 of the waveguide 21 is set to be longer than half the wavelength ( ⁇ g/2), it is possible to compactly form the entire apparatus. Accordingly, with the heating cooker according to the sixth embodiment, it is possible to stabilize the coupling in the microwave feeding structure, which enables maintaining higher heating efficiency. Therefore, with the structure according to the sixth embodiment, it is possible to structure a heating cooker capable of having both improved heating efficiency and improved compactness.
  • the microwave heating device by setting the horizontal propagation distance (H) of the horizontal propagation path in the waveguide to be longer than 1/2 the wavelength of microwaves which propagates through the waveguide ( ⁇ g/2), in the microwave heating device according to the present invention, the distance to the feeding port in the horizontal propagation path in the waveguide is made to be sufficiently longer with respect to the wavelength of propagated waves. This results in an increase of the stability of the coupling in the microwave feeding structure, which can maintain higher efficiently for heating operations, regardless of changes of operating states, such as load changes.
  • the microwave heating device is provided with the waveguide having a folded shape which is folded in an L shape, the microwave generating part which is horizontally coupled to the vertical propagation path in the waveguide, and the antenna room which houses the feeding part, such that the antenna room is coupled to the horizontal propagation path in the waveguide, it is possible to compact the microwave feeding structure and, also, it is possible to reduce the amount of heat conducted from the heating chamber to the microwave generating part.
  • the microwave heating device is capable of improving the heating efficiency of the microwave generating part and, also, is capable of attaining both compaction and heating-efficiency improvement in the microwave feeding structure including the microwave generating part.
  • the present invention can be applied to heating cookers for inductively heating food through radiation of microwaves, particularly heating cookers using other heating through ovens, grills, superheated steams and the like. Furthermore, the present invention can be applied to microwave heating devices for various industrial applications, such as drying apparatuses, ceramic-art heating apparatuses, garbage disposers, semiconductor fabrication apparatuses, and the like.
EP11809411.9A 2010-07-20 2011-07-05 Mikrowellenheizvorrichtung Active EP2597930B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2010162509 2010-07-20
JP2011129369 2011-06-09
PCT/JP2011/003831 WO2012011233A1 (ja) 2010-07-20 2011-07-05 マイクロ波加熱装置

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EP2597930A1 true EP2597930A1 (de) 2013-05-29
EP2597930A4 EP2597930A4 (de) 2015-11-04
EP2597930B1 EP2597930B1 (de) 2017-07-05

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JP (1) JP5884093B2 (de)
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EP3908080A1 (de) * 2020-05-08 2021-11-10 LG Electronics, Inc. Ofen mit antennen und verfahren zur steuerung desselben
EP3908081A1 (de) * 2020-05-08 2021-11-10 LG Electronics, Inc. Ofen
DE102020125734A1 (de) 2020-10-01 2022-04-07 Miele & Cie. Kg Gargerät, umfassend einen Garraum zur Wärmebehandlung eines Garguts mit Mikrowellen, und Hohlleiter für ein Gargerät
IT202200011456A1 (it) * 2022-05-31 2023-12-01 Twb S R L Dispositivo di cottura, particolarmente del tipo perfezionato.

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DE102016221447A1 (de) * 2016-11-02 2018-05-03 BSH Hausgeräte GmbH Haushalts-Gargerät
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
CN111769021B (zh) * 2020-04-16 2023-07-28 成都迈频汇能科技有限公司 一种侧接的微波圆波导激励装置
KR102329538B1 (ko) * 2020-04-21 2021-11-23 엘지전자 주식회사 조리기기
US11596033B2 (en) * 2020-06-09 2023-02-28 Whirlpool Corporation Condensation-managing hand-protecting cavity ventilation system
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CN112691297B (zh) * 2020-11-19 2022-03-04 成都恒波医疗器械有限公司 一种马鞍型微波照射器

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IT202200011456A1 (it) * 2022-05-31 2023-12-01 Twb S R L Dispositivo di cottura, particolarmente del tipo perfezionato.

Also Published As

Publication number Publication date
EP2597930B1 (de) 2017-07-05
CN102960060A (zh) 2013-03-06
JP5884093B2 (ja) 2016-03-15
JPWO2012011233A1 (ja) 2013-09-09
CN102960060B (zh) 2015-12-16
WO2012011233A1 (ja) 2012-01-26
EP2597930A4 (de) 2015-11-04

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