JP2008257972A - Microwave heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave heating apparatus which can achieve a uniform heating over an entire heating chamber of a wide width and also a local and intensive heating. <P>SOLUTION: The microwave heating apparatus is provide with a microwave generating means 32, wave guide 33, heating chamber 34 having a width-wise dimension larger than a depth-wise dimension, unrotatable placing base 35 on which a heating object is placed, housing space 36 for the heating object, rotatable antennas 38, 39 arranged symmetrically for a width-wise direction of the heating chamber for discharging microwave in the heating chamber, microwave discharging port 33a of a switching unit provided between the rotatable antennas, and controlling means 411 for controlling a direction of the rotatable antennas and opening and closing of the microwave discharging port. The controlling means 411 controls a portion having a strong discharging directionality in at least one rotatable antenna to face in a predetermined direction and a specific heating object can be intensively heated. As a result, a uniform heating over an entire heating chamber can be achieved and a local and intensive heating can be achieved as well. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a microwave heating apparatus that dielectrically heats an object to be heated.

  The microwave oven, which is a typical microwave heating device, can directly heat food, which is a typical object to be heated, making it an indispensable device in daily life with the simplicity that does not require the preparation of a pan or pot. It has become. In the microwave oven, the size of the space for storing food in the heating chamber through which microwaves propagate is approximately 300 to 400 mm in the width direction and the depth direction, and approximately 200 mm in the height direction. In recent years, the bottom of the space for storing foods has been flattened, and the width dimension is set to 400 mm or more, which is relatively larger than the depth dimension. Products that have been put into practical use.

  By the way, the wavelength of the microwave used by the microwave oven is about 120 mm, a strong electric field distribution (hereinafter referred to as radio wave distribution) is generated in the heating chamber, and the influence of the shape of the object to be heated and its physical characteristics It is known that heating unevenness occurs due to synergy. In particular, in the heating chamber having a large dimension in the width direction as described above, it is necessary to further improve the uniformity of heating in order to simultaneously heat foods placed on a plurality of tableware.

  Conventionally, this type of microwave heating apparatus is provided with one radiation antenna and rotationally drives the antenna. However, as a measure for improving the uniformity of heating, this type of microwave heating apparatus is provided with a plurality of radiation antennas or a plurality of high-frequency agitation devices. A device including means has been proposed (see, for example, Patent Document 1).

However, even if the interior is large, it does not always heat a large amount of food.For example, when warming a mug full of milk, it is more efficient to concentrate only on milk without heating the entire interior uniformly. Conceivable. Even when multiple foods are heated at the same time, for example, when there is a difference in the temperature of the food, as in the case of heating frozen food and food at room temperature at the same time, it may be desirable to heat only low-temperature food intensively. is there. In addition, if it's like a box lunch box, it contains foods (pickles, salads, desserts, etc.) that you don't want to heat in one container, and only the foods that should be heated (rice, side dishes, etc.) Sometimes you want to. In such a case, the function which can carry out local concentration heating instead of the whole uniform heating is needed. For this reason, there has been proposed a technique in which a plurality of radiation antennas are switched and central heating is performed by controlling a stop position (for example, see Patent Document 2).
JP 2004-259646 A Japanese Patent No. 3617224

  However, in any of the conventional configurations described above, various devices have been devised, but in a microwave heating apparatus having a heating chamber with a wide width, usually, the entire interior is uniformly heated while depending on the purpose. Realizing local concentrated heating was also difficult as a practical configuration.

In other words, the applicant provided multiple radiating antennas in the width direction of the heating chamber and controlled the direction of the radiating antennas to perform local intensive heating and uniform heating of the entire interior. It was difficult to satisfy both of these, and either one of the performances tended to be insufficient. In particular, in the case of local central heating, when the central portion of the heating chamber is centrally heated, it is difficult to obtain a sufficiently satisfactory central heating performance although it is performed by directing the portions of the two antennas having strong radio wave radiation directivity toward the center.

  This can be solved to some extent by setting the size between the two antennas to a specific size according to the size of the heating chamber, but in that case, the performance of local concentrated heating and uniform heating of the part other than the approximate center deteriorates. In order to make all these performances compatible with each other, some kind of response is required.

  The present invention has been made on the basis of such circumstances, and it is an object of the present invention to obtain a substantially satisfactory performance with both locally concentrated heating and uniform heating in the substantially central portion of the interior and other portions. .

  In order to achieve the above object, a microwave heating apparatus according to the present invention includes a microwave generating means, a waveguide for transmitting microwaves from the microwave generating means, and a width dimension connected to an upper portion of the waveguide. A heating chamber having a shape larger than the dimension in the depth direction; a mounting table disposed in the heating chamber for mounting the object to be heated; a heated object storage space formed above the mounting table in the heating chamber; An antenna space formed below the mounting table in the heating chamber, and microwaves in the waveguide are radiated into the heating chamber, so that the antenna space extends from the waveguide to the width direction of the heating chamber. Two rotating antennas arranged at symmetrical positions, a radio wave radiating port provided between the rotating antennas, an open / close member for opening / closing the radio wave radiating port, and driving the rotary antenna and the open / close member Drive means, and control means for controlling the drive means to control the direction of the rotating antenna and controlling the opening and closing member to open and close the radio wave emission port, the control means in at least one of the rotating antennas A specific object to be heated can be centrally heated by controlling a part having a strong radiation directivity in a predetermined direction, and when the central portion of the space to be heated is concentrated and overheated, the opening / closing member is driven to emit radio waves. The mouth is opened.

  As a result, the two rotating antennas coupled to the common waveguide below the heating chamber are arranged at symmetrical positions with respect to the width direction of the wide heating chamber, so that at least a left-right symmetric heating distribution is obtained, Since the radiation pattern of microwaves can be made more diversified than in the case of a single rotating antenna, the heating distribution in the entire chamber can be easily made uniform.

  In addition, if at least one of the rotating antennas is controlled in a predetermined direction with a portion having a strong radiation directivity, microwaves can be radiated strongly in a predetermined direction, so that a specific object to be heated can be easily and intensively heated. can do.

  In particular, the two rotary antennas are positioned so that local concentrated heating and uniform heating of the parts other than the substantially central portion of the chamber are at a level that can be satisfied substantially, so that the central portion of the central portion of the rotating antenna is heated locally. Also in this case, by opening the opening / closing member of the radio wave radiation opening, it is possible to sufficiently satisfy the local heating in the center of the cabinet, and it is possible to perform the local concentrated heating which is almost satisfactory even at the inside temperature.

  It is possible to provide an extremely realistic microwave heating apparatus that can achieve uniform heating of the entire interior and local concentrated heating including the central portion of the interior at a satisfactory level.

A first aspect of the present invention is a microwave generator, a waveguide that transmits microwaves from the microwave generator, and a heating chamber that is connected to an upper portion of the waveguide and has a width dimension larger than a depth dimension. A mounting table disposed in the heating chamber for mounting the object to be heated; a heated object storage space formed above the mounting table in the heating chamber; and a lower position than the mounting table in the heating chamber In order to radiate microwaves in the antenna into the heating chamber, the antenna space formed in the antenna space is arranged in a symmetrical position with respect to the width direction of the heating chamber from the waveguide to the antenna space. Two rotating antennas, a radio wave radiating port provided between the rotating antennas, an opening / closing member for opening / closing the radio wave radiating port, a driving means for driving the rotating antenna and the opening / closing member, and controlling the driving means to Control means for controlling the direction of the rotating antenna and controlling the opening / closing member to open and close the radio wave emission port, and the control means controls at least one portion of the rotating antenna having a strong radiation directivity in a predetermined direction. Thus, the specific object to be heated can be concentratedly heated, and when the substantially central portion of the object-to-be-heated storage space is concentrated and heated, the opening / closing member is driven to open the radio wave radiation opening.

  As a result, the two rotating antennas coupled to the common waveguide below the heating chamber are arranged at symmetrical positions with respect to the width direction of the wide heating chamber, so that at least a left-right symmetric heating distribution is obtained, Since the radiation pattern of microwaves can be made more diversified than in the case of a single rotating antenna, the heating distribution in the entire chamber can be easily made uniform. In addition, if at least one of the rotating antennas is controlled in a predetermined direction with a portion having a strong radiation directivity, microwaves can be radiated strongly in a predetermined direction, so that a specific object to be heated can be easily and intensively heated. can do. In particular, the two rotary antennas are positioned so that local concentrated heating and uniform heating of the parts other than the substantially central portion of the chamber are at a level that can be satisfied substantially, so that the central portion of the central portion of the rotating antenna is heated locally. Also in this case, by opening the opening / closing member of the radio wave radiation opening, it is possible to sufficiently satisfy the local heating in the center of the cabinet, and it is possible to perform the local concentrated heating which is almost satisfactory even at the inside temperature.

  In the second invention, in particular, in the first invention, the specific object to be heated is an object to be heated that is previously placed at a specific position indicated by a mark on the mounting table. As a result, the position of the object to be heated to be centrally heated is determined. Therefore, the object to be heated is in a desired state by radiating microwaves in a predetermined direction by controlling a portion having a high radiation directivity in a predetermined direction. Can be centrally heated.

  In a third aspect of the invention, in particular, in the first aspect of the invention, the specific position for placing the object to be heated is substantially the center in the width direction of the heating chamber, and the predetermined direction of the rotating antenna is substantially the center in the width direction of the heating chamber It is a thing. As a result, the two rotating antennas are arranged at symmetrical positions with respect to the width direction of the heating chamber, and both of them can make a portion having a strong radiation directivity toward the center in the width direction of the heating chamber. The object to be heated can be easily concentrated and heated. In particular, if the portion having strong radiation directivity of both rotating antennas is controlled toward the center in the width direction of the heating chamber, the object to be heated can be heated more intensively by a synergistic effect.

  In addition, since the position of the object to be heated that can be centrally heated can be limited, the parameter of the position of the object to be heated can be reduced among the parameters that affect the heating distribution, making it easy to perform centralized heating as designed. Thus, it is possible to realize effective central heating with higher accuracy. In addition, since the conditions for central heating are clarified, the risk of mistaken uniform heating and central heating can be reduced.

The fourth invention is based on the determination contents of the setting means, the central heating determination means for determining whether or not to perform central heating based on the setting contents by the setting means, and the determination contents of the central heating determination means in the first invention. The at least one rotating antenna is configured so as to concentrate and heat a specific object to be heated by controlling a portion having a strong radiation directivity in a predetermined direction. Thereby, since the central heating is performed by controlling the rotating antenna based on the set contents, it is possible to easily switch to the central heating while realizing uniform heating of the entire interior with a constant rotation. From the user's point of view, the microwave heating device automatically switches between uniform heating and concentrated heating as long as the setting is made, so that the risk of mistakes can be reduced.

  In particular, the fifth invention has detection means for detecting whether or not the object is a specific object to be heated in a concentrated manner in the first invention, and at least one of the rotary antennas has a portion having a strong radiation directivity in a predetermined direction. The specific object to be heated is configured to be centrally heated. Thereby, since the central heating is performed by controlling the rotating antenna based on the detected contents, it is possible to easily switch to the central heating while realizing uniform heating of the entire interior with a constant rotation. From the user's point of view, the microwave heating device automatically switches between uniform heating and concentrated heating, so that the risk of mistakes can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1-4 has shown the microwave oven as a microwave heating apparatus in Embodiment 1 of this invention.

  A microwave oven 31 in the present embodiment is connected to the magnetron 32, which is a typical microwave generating means, a waveguide 33 that transmits the microwave radiated from the magnetron 32, and a width connected to the top of the waveguide 33. The heating chamber 34 having a direction dimension (about 410 mm) larger than the depth direction dimension (about 315 mm) and a food (not shown), which is a typical object to be heated, are fixedly disposed in the heating chamber 34. A non-rotating mounting table 35 having a property that microwaves can be easily transmitted due to being made of a low-loss dielectric material such as ceramic or glass, and formed substantially above the mounting table 35 in the heating chamber 34 to be heated. A heated object storage space 36 that is a space for storing objects, an antenna space 37 formed below the mounting table 35 in the heating chamber 34, and microwaves in the waveguide 33. In order to radiate into the heat chamber 34, the two rotating antennas 38, 39 attached to the symmetrical position with respect to the width direction of the heating chamber 34 from the waveguide 33 to the antenna space 37, and the rotating antennas 38, 39 are rotated. Motors 40 and 41 as typical driving means for driving, a radio wave emission port 33a provided between the rotary antennas 38 and 39 and positioned substantially at the center of the heating chamber, and usually the radio wave emission port 33a are provided. The opening / closing member 33b is closed, and the control means 411 controls the motors 40, 41 and the opening / closing member 33b to control the direction of the rotating antennas 38, 39. And the control means 411 is set as the structure which controls the site | part with a strong radiation directivity in at least one rotation antenna 38 or 39 to a predetermined direction, and concentrates and heats a specific to-be-heated object.

  The rotary antennas 38 and 39 are electrically conductive in a substantially cylindrical shape with a diameter of about 18 mm that penetrates the coupling holes 43 and 44 with a diameter of about 30 mm provided at the boundary surface between the waveguide 33 and the bottom surface 42 of the heating chamber. The coupling portions 45, 46 made of material and the upper ends of the coupling portions 45, 46 are integrated by being electrically connected by caulking, welding or the like, and are made of a conductive material having a larger area in the horizontal direction than the vertical direction. Radiation portions 47 and 48 are provided, and the coupling portions 45 and 46 are fitted with the shafts 49 and 50 of the motors 40 and 41 so that the centers of the coupling portions 45 and 46 become the centers of rotation driving. The radiating portions 47 and 48 are configured to have radiation directivity because the shape is not constant with respect to the direction of rotation (atypical).

As shown in FIG. 3, the waveguide 33 is T-shaped when viewed from above and has a symmetrical shape. Therefore, the distance from the magnetron 32 to the coupling portions 45 and 46 is equal, and the coupling portion 45, 46 is mounted at a symmetrical position with respect to the width direction of the heating chamber 34, so that the microwaves radiated from the magnetron 32 are almost uniformly distributed in the heating chamber 34 via the waveguide 33 and the rotating antennas 38 and 39. Distributed to. As another example of the waveguide 33, it is possible to provide a linear configuration in the longitudinal direction of the heating chamber and to provide a magnetron at one end thereof.

  The radiating portions 47 and 48 have the same shape, and the radiating portion upper surfaces 51 and 52 have a substantially quadrilateral R shape, and the radiating portion bending portion 53 bent to the heating chamber bottom surface 42 side on two opposite sides thereof. , 54 and restricts microwave radiation to the outside of the two sides. The distance between the heating chamber bottom surface 42 and the radiating portion upper surfaces 51 and 52 is about 10 mm, and the radiating portion bending portions 53 and 54 are pulled down to a position lower by about 5 mm. The remaining two sides have different horizontal lengths from the coupling portions 45 and 46 to the end portions, and the end portions 55 and 56 and the coupling portions 45 and 46 whose length from the center of the coupling portions 45 and 46 is about 75 mm. The end portions 57 and 58 having a length from the center of about 55 mm are formed. Moreover, the dimension of the width direction of each edge part is 80 mm or more. In this configuration, the rotating antennas 38 and 39 can increase the radiation directivity in the direction from the coupling portions 45 and 46 to the end portions 57 and 58.

  In this configuration, when heating a general food uniformly, it is not necessary to pay particular attention to the place where the food is placed, as in the conventional microwave oven, and the control means 411 rotates the rotating antennas 38 and 39 as in the conventional case. Let

  On the other hand, when the localized heating is performed, the control unit 411 controls the end portions 57 and 58 of the rotary antennas 38 and 39 so as to be directed to the localized portion to be concentrated heating. Thereby, since the microwave radiation directivity in the direction of the end portions 57 and 58 of the rotating antennas 38 and 39 is strong, the object to be heated placed in the local portion can be locally heated.

  Here, in this embodiment, during the local heating, the rotary antennas 38 and 39 are set so that the local heating performance of the peripheral portion can be satisfied from the central portion of the heating chamber, and the object to be heated in the central portion is set. When heating, it is as follows. That is, as shown in FIG. 4, a mark 59 is marked on the substantially central portion of the mounting table 35 in advance, and the user places food on the mark 59. The mark 59 is approximately the center in the width direction of the heating chamber 34 and the center in the depth direction, and the control means 411 controls the end portions 57 and 58 of the rotating antennas 38 and 39 to centrally heat the food placed on the mark 59. The heating chamber 34 is controlled so as to be directed to the mark 59 portion. At the same time, the open / close member 33b closing the radio wave emission port 33a is driven to open the radio wave emission port 33a. When at least one of the end portions 57 and 58 of the rotating antennas 38 and 39 faces the approximate center in the width direction of the heating chamber 34 and the approximate center in the depth direction, radiation directivity in the direction of the ends 57 and 58 increases. Since the radio wave radiation port 33a located between the two rotating antennas 38 and 39 is opened and microwaves are emitted from here, the food placed on the mark 59 can be heated intensively. it can.

  In order to orient the rotating antennas 38 and 39 in a predetermined direction, a stepping motor is used as the motors 40 and 41, or even if the motor rotates at a constant speed, the energization time is controlled by detecting the reference position. Can be considered.

  5 and 6 show the characteristics of the concentrated heating of the present embodiment. FIG. 5 shows the result of heating about 150 g of a bowl of rice with the rotating antennas 38 and 39 being rotated at a constant rate of 10 seconds. When only two rotating antennas are provided, Heating is performed from the hatched portion 60, and then the hatched portion 61 at the center lower portion is heated. Therefore, the heating distribution itself is not uniform even if it is good, but when there is a radio wave emission port 33a as in this embodiment, The left and right and top and bottom have a well-balanced heating distribution, and a fairly uniform heating distribution enables good heating.

On the other hand, FIG. 6 shows a case where about 200 cc of a full mug of milk is placed on the mark 59, both the rotating antennas 38 and 39 are stopped with the ends 57 and 58 directed toward the center, and the radio wave radiation opening 33a is opened and heated. As a result, the two shaded portions 62 at the bottom are strongly heated. In the case of liquids such as drinks, it is known that heating only the bottom tends to be uniform by convection, and conversely, if heat is applied uniformly in the vertical direction, only the top is heated. Therefore, since the distribution of FIG. 6 can heat the bottom part intensively, heating suitable for a drink can be performed.

  Next, a specific control example will be described. In FIG. 2, the setting unit 63 is disposed below the door 64, and the control unit 411 determines whether or not the central heating determination unit 66 performs central heating based on the content set by the user using the setting unit 63. Is. Based on the determination result, the control means 411 controls the magnetron 32, the motors 40 and 41, and the opening / closing means 33a.

  For example, when the user sets a bowl of rice or a mug of milk using the setting means 63, the central heating determination means 66 determines that central heating is necessary, and the control means 411 uses the motors 40 and 41 to rotate the rotating antenna 38, 39 is rotated so that it stops when it is directed toward the center, and the opening / closing means 33b is driven to open the radio wave emission port 33a.

  On the other hand, when the user sets warming such as pizza by the setting unit 63, the central heating determination unit 66 determines that central heating is not necessary, and the control unit 411 rotates the rotary antennas 38 and 39 by driving the motors 40 and 41. To control. Thereby, the whole pizza can be heated uniformly.

  As described above, in the present embodiment, the two rotary antennas 38 and 39 coupled to the common waveguide 33 on the lower side of the heating chamber 34 are positioned symmetrically with respect to the width direction of the heating chamber 34 having a wide width. Because it is at least a symmetrical heating distribution, and the microwave radiation pattern can be more diversified than in the case of a single rotating antenna, the heating distribution in the entire chamber can be easily uniformized. Can do. Further, if the end portions 57 and 58 which are strong radiation directivity portions of both the rotating antennas 38 and 39 are controlled in a predetermined direction (toward the center in the cabinet) and the radio wave radiation opening 33a is opened, microwaves are generated. Since it can radiate | emit strongly in a predetermined | prescribed direction (center direction in a store | warehouse | chamber), it can intensively heat easily regarding a specific to-be-heated object (milk put on the mark 59).

  In the present embodiment, an example in which both the rotating antennas 38 and 39 are stopped at the time of local concentrated heating has been described. For example, one of the rotating antennas 38 and 39 is stopped and the other is rotated. Various control methods are conceivable, such as changing the rotation so that the one that has been stopped from the middle is rotated and the one that has been rotated is stopped. Such a control method is effective in the case where it is desirable that the time between concentrated heating and uniform heating is desirable because concentrated heating is too concentrated. At this time, the ratio between rotation and stop may be optimized as appropriate.

  Furthermore, the microwave heating apparatus according to the present embodiment has a very simple configuration in which the directions of the two rotating antennas 38 and 39 coupled to one waveguide 33 are controlled. There is no risk of changing the coupling state of microwaves when switching between local concentrated heating, and there is no need for severe dimensional management such as gap management, so it can be realized with a very realistic configuration. is there.

(Embodiment 2)
7 to 9 show a microwave heating apparatus according to Embodiment 2 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In this embodiment, the side wall surface of the heating chamber 34 is provided with rails 125 and 126 for holding special dishes used in oven and grill cooking. The state where the grill pan 127 is mounted on the lower rail 126 is shown. The grill pan 127 is made of a conductive material and reflects microwaves. However, the microwave absorber 128 is integrated on the back surface, and if microwaves are irradiated from below, the microwaves are absorbed rapidly. The temperature rises to a high temperature (250 ° C. or higher), and the food (hamburger, chicken leg, etc.) placed on the grill pan 127 can be baked. In this case, the grill pan 127 can be considered as a dedicated container, the microwave absorber 128 as an object to be heated, and the rails 125 and 126 as landmarks.

  The rotating antennas 129 and 130 have radiating portions 131 and 132, and the radiating portions 131 and 132 have symmetrical shapes (same as turning over) by forming openings 133 and 134 at symmetrical positions, respectively. ing. The openings 133 and 134 each have a length equal to or more than ¼ of the wavelength of the microwave and have the same shape (for example, a rectangle of 60 mm × 20 mm), but the opening 134 radiates more than the opening 133. It becomes a part with strong directivity. This is m <n, where m in the case of the opening 133 and n in the case of the opening 134 in the direction orthogonal to the line segment connecting the coupling portion and the center of each opening. Because.

  8 and 9, the rotating antenna 129 has a strong directivity in the right direction, the rotating antenna 130 has a strong directivity in the left direction, and the microwave is concentrated in the center of the microwave absorber 128. The temperature at the center of the grill pan 127 is the highest. Of course, in this case as well, the radio wave emission port 33a is revised, so that a good concentrated heating can be performed by adding microwaves. If a small amount of hamburger or the like is placed in the center of the grill pan 127, it can be heated very efficiently and baked in a short time. At this time, the setting means (not shown) may set that the amount of hamburger is small.

  However, in addition, the temperature detection means (not shown) detects the temperature distribution of the grill pan 127 while rotating the rotating antennas 129 and 130 at a constant speed, and the portion in contact with the hamburg is heat-exchanged so that the temperature slightly increases. Therefore, it can be determined that there is food only where the temperature is lowered, and the microwave can be concentrated only on the microwave absorber 128 under the position where the food is located. Of course, in order to know the position of the food, the detection means need not be limited to the temperature, and methods such as detecting the shape with light or detecting the weight and the center of gravity are also conceivable.

  When the features in this embodiment are summarized as described above, the rotating antenna of this embodiment is orthogonal to the line segment connecting the coupling portion and the center of each opening when there are a plurality of openings and the directions are different. The longer the opening length in the direction to travel, it will span many areas of microwaves that are going to propagate in all directions (360 degrees in the horizontal direction) from the coupling part, and many microwaves will propagate upward Therefore, the radiation directivity in that direction can be strengthened, and the object to be heated can be heated intensively.

  Further, if the predetermined container is configured to cover the entire plane of the heating chamber 34 like the grill pan in the present embodiment, the front / rear and left / right positions in the cabinet are determined, and the rail 125 to be mounted. , 126 is determined, the position in the height direction is also determined.

  As a result, the shape of the object to be heated (in this embodiment, the microwave absorber 128) is integrated with the container, and the horizontal direction and the height direction are determined, and the distance from the rotating antennas 129 and 130 is set. Can always be constant. Since the shape and positional relationship of the object to be heated can be limited in this way, the parameter of the object to be heated among the parameters that influence the heating distribution can be reduced. This makes it possible to achieve effective centralized heating with higher accuracy. In addition, since the conditions for central heating are clarified, the risk of mistaken uniform heating and central heating can be reduced.

  The configurations of the first and second embodiments described above can be implemented in various combinations as necessary.

  As described above, the microwave heating apparatus according to the present invention can perform uniform heating and local intensive heating of the entire interior of the cabinet, and at a level that can also satisfy local intensive heating at the substantially central portion of the interior and other portions. It becomes possible, and a very practical microwave heating apparatus can be realized. Therefore, it can be applied to uses such as heating, thawing, ceramics heating, drying, sintering or biochemical reaction of various dielectric materials such as food.

Front sectional view of the microwave heating apparatus according to the first embodiment of the present invention. Sectional view by the AA line of FIG. Sectional view along line B-B Sectional view along line CC (A) Rice heating distribution view from above (b) Rice heating distribution view from side (A) Milk heating distribution viewed from above (b) Milk heating distribution viewed from the side Front sectional view of the microwave heating apparatus according to Embodiment 2 of the present invention Sectional view by the II line of FIG. Sectional view along line JJ

Explanation of symbols

31 Microwave oven (microwave heating device)
32 Magnetron (microwave generation means)
33 Waveguide 33a Radio wave emission opening 33b Opening / closing means 34 Heating chamber 35 Mounting table 36 Heated object storage space 37 Antenna space 38, 39, 129, 130 Rotating antenna 40, 41 Motor (driving means)
42 Heating chamber bottom surface 47, 48, 131, 132 Radiation part 59 Mark 63 Setting means 411 Control means

Claims (5)

A microwave generating means, a waveguide for transmitting microwaves from the microwave generating means, a heating chamber connected to an upper portion of the waveguide and having a width dimension larger than a depth dimension, and an object to be heated A mounting table disposed in the heating chamber for mounting, a heated object storage space formed above the mounting table in the heating chamber, and an antenna space formed below the mounting table in the heating chamber And two rotating antennas disposed in symmetrical positions with respect to the width direction of the heating chamber from the waveguide to the antenna space in order to radiate microwaves in the waveguide into the heating chamber, A radio wave radiating port provided between the rotating antennas, an open / close member that opens and closes the radio wave radiating port, a driving unit that drives the rotating antenna and the open / close member, and the rotating antenna that controls the driving unit Control means for controlling the direction and controlling the opening and closing member to open and close the radio wave radiation opening, and the control means controls and specifies a portion having strong radiation directivity in at least one of the rotating antennas in a predetermined direction. The microwave heating apparatus is configured such that the object to be heated can be centrally heated, and when the substantially central portion of the space to be heated is concentrated and heated, the opening and closing member is driven to open the radio wave radiation opening. The microwave heating apparatus according to claim 1, wherein the specific object to be heated is an object to be heated that is previously placed at a specific position indicated by a mark on the mounting table. The microwave heating apparatus according to claim 1, wherein the specific position where the object to be heated is placed is substantially the center in the width direction of the heating chamber, and the predetermined direction of the rotary antenna is substantially the center in the width direction of the heating chamber. A setting unit, a central heating determination unit that determines whether or not to perform central heating based on the setting content by the setting unit, and a portion having a strong radiation directivity based on the determination content of the central heating determination unit The microwave heating apparatus according to claim 1, wherein the microwave is heated in a predetermined direction so that a specific object to be heated is concentratedly heated. It has a detection means for detecting whether or not a specific object to be heated is to be centrally heated, and at least one of the rotating antennas is controlled in a predetermined direction at a portion having a strong radiation directivity to centrally heat the specific object to be heated. The microwave heating device according to claim 1, which is configured.

Images