JP2008282692A - Microwave heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave heating apparatus in which a conductor part needs be connected to the opposite side of a heating chamber wall to be connected with a waveguide, in which these can be surely connected even when the positions of the waveguide and the conductor part overlap. <P>SOLUTION: In a matching plate 12 (conductor part) which is integrated on the opposite side of the heating chamber wall 31 to be connected to a waveguide 2, the microwave heating apparatus has a connecting part 121 to be connected to the heating chamber wall 31 and an evasion part 124 which evades the connection position of the waveguide 2 and the heating chamber wall 31. Since the waveguide 2 and the heating chamber wall 31 are connected at the evasion part 124, connection of the matching plate 12 (conductor) to the heating chamber wall 31 and connection of the waveguide 2 and the heating chamber wall 31 can be connected separately without mutually interfering each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

A microwave oven, which is a typical microwave heating device, can directly heat food that is a typical object to be heated, so there is no need to prepare a pot or kettle, and it is essential for living. It has become a cooking utensil. In the conventional microwave ovens, the size of the space for storing the food in the heating chamber where microwaves are radiated is generally about 300 to 400 mm in the width direction and the depth direction, and about 200 mm in the height direction. Yes. Conventionally, there is a microwave oven that increases the uniformity of heating by rotating one radiation antenna provided at the bottom of the heating chamber, but it is radiated to the four corners to rotate the antenna in the center despite the square bottom. The microwaves that do not enter the load directly, reach the wall surface and diffusely reflect before entering the load. In order to suppress this, there has been proposed one in which reflectors made of conductors are provided around the antenna, particularly at the four corners, and the microwave radiated from the antenna is quickly reflected and led to the load (for example, see Patent Document 1). .
JP 2004-235162 A

  In the above conventional configuration, for example, like the microwave oven shown in FIG. 13, the rotating antenna 24 is arranged at the center of the heating chamber 25, and the reflector 26 integrated with the bottom surface of the heating chamber is formed at each corner portion. Yes. As shown in FIG. 14, the reflection plate 26 includes a main body 27 and a connection portion 28 bent at a right angle from the main body 27, and the connection portion 28 is integrated with the heating chamber bottom surface 29 by spot or caulking. In FIG. 13, the waveguide 30 is disposed at the center in the cabinet (the vertical center in FIG. 13), so the positions of the waveguide 30 and the reflector 26 do not overlap. Therefore, the connection position between the heating chamber bottom surface 29 and the waveguide 30 and the connection position between the heating chamber bottom surface 29 and the reflection plate 26 can be easily connected without interfering with each other. However, it is also assumed that the waveguide 30 must be moved to the end in consideration of the arrangement of other components. If the waveguide 30 and the reflection plate 26 are overlapped, the connection cannot be easily made. For example, when the heating chamber bottom surface 29, the waveguide 30 and the reflection plate 26 are all made of a conductor, if these three parts are overlapped and spotted at the same time or caulked, the two parts are overlapped and spotted. It may be easy to come off.

  The present invention has been made in view of the above-described conventional circumstances, and in a microwave heating apparatus in which a conductor portion needs to be connected to an opposite surface of a heating chamber wall surface connected to a waveguide, the waveguide and the conductor portion are provided. An object of the present invention is to provide a microwave heating apparatus capable of reliably connecting these even when their positions overlap.

  The microwave heating apparatus of the present invention includes a microwave generation unit that generates microwaves, a heating chamber that stores an object to be heated by the microwaves, and a microwave that propagates from the microwave generation unit to the heating chamber. And a conductor portion integrated on the opposite surface of the heating chamber wall surface connected to the waveguide, and the conductor portion is connected to the main body and the heating chamber wall surface. And an avoidance portion that avoids a connection position between the waveguide and the wall surface of the heating chamber.

With this configuration, by connecting the waveguide and the heating chamber wall surface at the avoidance portion, the connection of the conductor portion to the heating chamber wall surface and the connection between the waveguide and the heating chamber wall surface do not interfere with each other. Can be connected separately. As a result, when three parts of the heating chamber wall, waveguide, and conductor are stacked and connected at the same time (spotting or caulking), it is easier to come off than when two parts are spotted. Because it can be divided into processing, there is an effect that is difficult to come off.

  According to the present invention, in the conductor portion integrated with the opposite surface of the heating chamber wall surface connected to the waveguide, the connection portion connected to the heating chamber wall surface and the connection position of the waveguide and the heating chamber wall surface are determined. Since it has a configuration having an avoidance part to avoid, by connecting the waveguide and the heating chamber wall surface at the avoidance part, the connection of the conductor part to the heating chamber wall surface and the connection between the waveguide and the heating chamber wall surface Connections can be made separately without interfering with each other. As a result, when three parts of the heating chamber wall, waveguide, and conductor are stacked and connected at the same time (spotting or caulking), it is easier to come off than when two parts are spotted. Because it can be divided into processing, there is an effect that is difficult to come off.

  A microwave heating apparatus according to a first aspect of the present invention includes a microwave generation unit that generates a microwave, a heating chamber that stores an object to be heated by the microwave, and a microwave from the microwave generation unit to the heating chamber. And a conductor portion integrated on the opposite surface of the heating chamber wall surface connected to the waveguide, and the conductor portion is connected to the main body and the heating chamber wall surface. It has a configuration having a connection portion and an avoidance portion that avoids the connection position between the waveguide and the heating chamber wall surface, and the conductor is connected by connecting the waveguide and the heating chamber wall surface at the avoidance portion. The connection to the heating chamber wall surface and the connection between the waveguide and the heating chamber wall surface can be made separately without interfering with each other. As a result, when three parts of the heating chamber wall, waveguide, and conductor are stacked and connected at the same time (spotting or caulking), it is easier to come off than when two parts are spotted. Because it can be divided into processing, there is an effect that is difficult to come off.

  The microwave heating apparatus according to the second invention includes at least two connecting portions and includes an avoiding portion configured between the connecting portions. With this configuration, the conductor portion and the heating chamber are connected by the two connecting portions. Connection between the waveguide and the heating chamber wall surface can be avoided while maintaining the connection strength of the wall surface.

  In the microwave heating apparatus according to the third aspect of the present invention, the avoidance unit includes a configuration in which a plate member forming the connection unit is cut, and the avoidance unit can be easily realized by this configuration.

  According to a fourth aspect of the present invention, there is provided a microwave heating apparatus including a plurality of rotating antennas that radiate microwaves from a waveguide to a heating chamber, wherein the conductor portion is disposed between the plurality of rotating antennas, and the main body includes a microwave. In some cases, a matching plate is used to prevent concentration of the matching plate. When this arrangement restricts the arrangement of the matching plate between a plurality of rotating antennas, the matching plate and the waveguide overlap each other. Even if it becomes, the connection of the alignment plate to the heating chamber wall surface and the connection between the waveguide and the heating chamber wall surface can be connected separately without interfering with each other.

  A microwave heating apparatus according to a fifth aspect of the present invention includes a rotating antenna that radiates microwaves from a waveguide to a heating chamber, and a conductor is disposed around a corner of the heating chamber around the rotating antenna. Includes a structure that makes a reflector that reflects microwaves, and even if the reflector and the waveguide overlap each other by this structure, the reflector is connected to the wall of the heating chamber. In addition, the waveguide and the heating chamber wall surface can be connected separately without interfering with each other.

The microwave heating apparatus according to the sixth aspect of the present invention includes an apparatus for connecting the heating chamber wall surface and the waveguide after integrating the heating chamber wall surface and the conductor portion. Connection to the heating chamber wall surface of the part and connection between the waveguide and the heating chamber wall surface can be realized. If the order is reversed, the conductor cannot be connected because the waveguide is in the way, so it is necessary to devise such as making a hole in the waveguide and inserting a connection jig.

  In the microwave heating apparatus of the seventh invention, the burr direction when the heating chamber wall surface and the conductor part are integrated is directed to the inside of the heating chamber so that the burr is not emitted inside the waveguide. As a result, it is possible to prevent burrs from being generated in a waveguide having a strong electric field strength. It is also possible to prevent the burr from hitting the wall surface of the waveguide.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
1 and 2 are diagrams showing a schematic configuration of a microwave oven that is a microwave heating apparatus according to an embodiment of the present invention. FIG. 1 is a plan sectional view seen from above, and FIG. 2 is a front view seen from the front. It is sectional drawing.

  In FIG. 1, the microwave oven of the present embodiment is connected to a magnetron 1 that is a typical microwave generator, a waveguide 2 that propagates microwaves emitted from the magnetron 1, and an upper portion of the waveguide 2. The heating chamber 3, the mounting table 5 on which the food 4 that is a typical object to be heated is mounted, the antenna space 6 formed below the mounting table 5, and the heating chamber 3 are fitted with two coupling holes 7 and 7 provided on the bottom surface at an approximately equal distance from the center of 3 and rotating antennas 8 and 8 disposed in the antenna space 6 and rotatable about the coupling holes 7 and 7. The motors 9 and 9 function as drive units that drive the rotating antennas 8 and 8 via the drive shaft, and the control unit 10 that controls the rotation and stop of the motors 9 and 9.

  Moreover, the microwave oven of this embodiment is provided with the setting means 11, and a user can select a cooking menu according to food or cooking content. Based on the selection result, the control unit 10 controls the magnetron 1 to generate and stop the microwave, and also controls the motor 9 to control the rotation and stop of the rotating antennas 8 and 8. Thereby, the food 4 mounted on the mounting table 5 can be heated and cooked.

  The rotating antenna 8 is a substantially L-shaped patch antenna. The rotating antenna 8 penetrates the coupling portion 7 through the radiation portion 81 made of a flat conductive material having a longitudinal direction along the L shape, and is electrically connected to the radiation portion 81. And a coupling portion 82 made of a cylindrical conductive material integrated mechanically.

  FIG. 3 is a plan view illustrating a specific shape of the radiating portion 81.

  In FIG. 3, the length from the center of the coupling portion 82 of the radiating portion 81 to the end portion 84 in the longitudinal direction of the long side 81a along the L-shape is 50 mm. On the other hand, along an alternate long and short dash line (hereinafter referred to as a reference line) having a long side width of 30 mm, it bends in an L shape at an angle of 83.62 ° at a position of 35 mm from the center of the coupling portion 82, The creeping surface of the end portion 83 of the short side 81b along the L-shape of the radiating portion 81 at a distance of 45 mm is configured to form a part of an arc having a radius of 60 mm with the coupling portion 82 as the center.

  When the overall shape of the radiating portion 81 in plan view is grasped as an L shape, the long side 81a is defined as a first portion coupled to the coupling portion 82, while the short side 81b is defined as the first portion. Defined as the intersected second part. In addition, as described above, the length in the longitudinal direction of each part (the first part and the second part) of the radiating part is the length of the reference line indicated by the alternate long and short dash line located at the center in the width direction of the radiating part. It can be defined by the length of the direction.

  According to this shape, the rotation diameter of the radiating portion 81 centered on the coupling portion 82 is 120 mm, which corresponds to the wavelength of the microwave (one wavelength), and the diameter when the antenna rotates from the width of the heating chamber 4. Is a dimension that can be used even when is limited to one wavelength or less of the microwave.

  In other words, in the present embodiment, the radiating portion 81 has two portions that intersect each other, ie, the first portion (long side 81a) and the second portion (short side 81b), and thus is restricted by the rotation diameter. Even in a narrow space, a substantially larger length (a length along the reference line) than the simple rotation diameter or rotation radius is secured. Specifically, in FIG. 3, the radius of rotation is 60 mm, but the substantial length of the radiating portion corresponding to the radius is 35 + 45 mm = 80 mm. Therefore, it is considered that microwaves with strong directivity can be emitted even in a narrow space.

  However, since the radiating portion 81 is L-shaped, the directivity of the radiating portion as a whole is slightly bent from the longitudinal direction, and is oriented as shown by the solid arrow line 85.

  Next, the configuration of the matching plate 12 (conductor portion) will be described. In particular, FIG. 4 shows a view seen from the direction of the solid arrow 13 in FIG. 1. FIG. 4 shows a case where the end 83 of the radiating portion 81 of the right rotating antenna 8 is closest to the matching plate 12. .

  The matching plate 12 (conductor portion) is made of a plate of a conductive material such as stainless steel, iron, or a plated steel plate, that is, a conductor portion, and is integrated on the bottom surface 31 of the heating chamber by spots or caulking. The alignment plate 12 (conductor portion) is disposed between the plurality of rotating antennas 8 and 8. In particular, the locus of the outer periphery of the antenna 8 on the right side of FIG. When arranged, the longitudinal direction (30 mm) is arranged in the tangential direction.

  As shown in FIG. 4, the shape of the matching plate 12 (conductor portion) is bent toward the connecting portion 121 integrated on the heating chamber bottom surface 31, the vertical body 122, and the radiation portion 81 side of the right rotating antenna 8. It is comprised from the front-end | tip part 123 made. Here, the radiation part 81 is at a distance of 10 mm from the bottom surface 31 of the heating chamber, the height of the main body 122 is 14 mm, the bending dimension of the tip part 123 is 5 mm, the horizontal distance from the tip part 123 to the radiation part 81 is 4 mm, Further, as shown in FIG. 1, the longitudinal direction is 30 mm.

Next, the effect of the matching plate 12 (conductor portion) will be described. FIG. 5 shows the temperature data when 15 frozen springs were heated at 800 W for 3 minutes, FIG. 5A shows the result without the alignment plate 12, and FIG. 5B shows the result with the alignment plate 12. Is shown. The numerical value shown in the figure is the temperature of the central part of each of the springs after the end of heating, and the temperature difference from the 15 highest to the lowest is 31K in FIG. 5 (a) and 22K in FIG. 5 (b). The unevenness of temperature was improved by the plate 12. Further, when the alignment plate 12 in FIG. 5 (a) is not present, the two right back vertigos are attached by overcooking, and the portion of the shaded portion 15 is slightly hardened, but when the alignment plate 12 in FIG. 5 (b) is present. That didn't happen. That is, the matching plate 12 eliminates the local overcooking of the display. By the way, if the positional relationship of the rotary antennas 8 and 8, the outer periphery 14 of the rotary antenna, and the alignment plate 12 is described in an overlapping manner, it becomes as shown in FIG. 6, and the overcooked hatched portion 15 shown in FIG. Is exactly the location on the outer periphery 14 of the rotating antenna and where the end 83 of the right rotating antenna 8 passes. Therefore, it is considered that local overcooking could be prevented by disposing at least a part of the microwaves in this vicinity so as to reflect at least a part of the microwave and avoid electric field concentration. By the way, the outer periphery 14 of the end 83 of the rotating antenna 8 passes through the vicinity of other springs, and it is not surprising that overcooking occurs on the outer periphery of the left antenna. However, considering the reason why only the hatched portion 15 is overcooked, this is not determined only by the rotating antenna, but the heating chamber of the microwave oven is a cavity resonator in which microwaves are confined, and standing waves also occur. It is considered that the place where the standing wave is strong and the tip of the antenna also passes is most likely to be overcooked.

  In summary, in this embodiment, since the matching plate 12 (conductor portion) is disposed between the plurality of rotating antennas 8 and 8, at least a part of the microwave when the rotating antennas 8 and 8 face each other is reflected. As a result, the electric field concentration in the vicinity of the end 83 of the rotating antennas 8 and 8 can be dispersed, and the local overcooking of the crown can be prevented.

  In particular, since the matching plate 12 (conductor portion) is disposed tangential to the outer periphery 14 of the right rotating antenna 8, the matching plate 12 faces the right rotating antenna 8. The radiated microwave can be effectively reflected, and the electric field concentration in the vicinity of the end 83 of the right rotating antenna 8 can be dispersed to prevent local overcooking at the back right of the crown.

  In addition, the effect of the alignment plate 12 can be further enhanced by the configuration in which the alignment plate 12 has the tip portion 123 facing the right rotation antenna 8 side. This is because the microwave radiated from the end portion 83 of the rotating antenna 8 is reflected by the main body (standing wall portion) 122 of the matching plate 12 to suppress the reflected wave as it is, and directly obliquely from the end portion 83 of the rotating antenna 8. This is presumed to suppress a part of the microwave radiated upward.

  Furthermore, the effect of the alignment plate 12 can be enhanced most by the configuration in which the control unit controls the direction of the directivity of the right rotating antenna 8 to stop toward the alignment plate 12.

  The meaning of arranging the matching plate 12 between the plurality of rotating antennas 8 and 8 includes the arrangement shown in FIG. 1, and if the matching plate 12 is located on the other antenna side when viewed from one antenna, it is somewhat. It is considered effective.

  In addition, the meaning that the rotating antennas 8 and 8 face each other is typified by the orientation as shown in FIG. 1, for example. However, although the directivity of the antenna is strong in the direction of the solid arrow 85, it has a certain width. Since the wave is radiated, it is not limited to the direction of FIG. 1, but if it is directed to the other antenna side than the perpendicular direction (the solid arrow 85 is upward or downward in FIG. 1) It is considered that there is some effect. In particular, in the case of a patch antenna, the directivity becomes stronger in the longitudinal direction, so it is considered that it is effective if the longitudinal direction is generally directed to another antenna side rather than a right angle.

  Next, the connection of the alignment plate 12 to the heating chamber wall surface will be described. FIG. 7 is an enlarged configuration diagram of a main part of FIG. 1 and shows a part of the matching plate 12 and the waveguide 2 (shown by a broken line because it is below the bottom surface 31 of the heating chamber). FIG. 8 is a cross-sectional view taken along the solid arrow line 16 in FIG.

  The matching plate 12 (conductor portion) integrated with the opposite surface of the heating chamber wall surface 31 connected to the waveguide 12 includes the main body 122, the connection portion 121 connected to the heating chamber wall surface 31, and the waveguide 2. And an avoiding portion 124 for avoiding the connection position of the heating chamber wall surface 31. The connection part 121 has crimping parts 125 and 125 as two connection points with the heating chamber bottom surface 31, and the avoidance part 124 is located between the crimping parts 125 and 125 in the central part of the connection part 121. The plate body 121 is formed by cutting. As described above, the matching plate 12 (conductor portion) is disposed between the plurality of rotating antennas, and the main body 122 and the tip portion 123 of the matching plate 12 (conductor portion) are for preventing the concentration of microwaves. .

Further, as a manufacturing method for integrating the matching plate 12 (conductor portion) and the waveguide 2 with the heating chamber wall surface 31, the heating chamber wall surface 31 and the matching plate 12 (conductor portion) are connected via caulking portions 125, 125. After the integration by caulking, the heating chamber wall surface 31 and the waveguide 2 are connected by spot welding at a number of spot points 17. By the way, the distance between the spot points 17 of the waveguide 2 increases as the distance increases, so that a gap is easily generated between them, and microwaves are likely to leak. Therefore, ideally, the smaller the better, but a pitch of about 15 to 20 mm as much as possible. Spotted at a pitch of about 30 mm at most. Further, in addition to the waveguide 2, more precisely, by spotting the conductive plate 18 and the heating chamber wall surface 31, a closed space formed between the two acts as the waveguide 2. Become. Further, the burr direction (protruding direction) of the caulking portions 125 and 125 when the heating chamber wall surface 31 and the alignment plate 12 (conductor portion) are integrated by caulking processing is set to be inward of the heating chamber (upward in FIG. 8). Thus, no burrs are generated inside the waveguide 2.

  The connection of the matching plate 12 (conductor portion) to the heating chamber wall surface has been described above, and the effect will be described. By connecting the plate 18 forming the waveguide 2 and the heating chamber wall surface 31 at the avoidance portion 124, the alignment plate 12 (conductor portion) is connected to the heating chamber wall surface 31 and the waveguide 2 is formed. It is possible to separately connect the plate body 18 and the heating chamber wall surface without interfering with each other. As a result, the heating chamber wall 31, the waveguide 2, and the matching plate 12 (conductor part) are all made of a conductor, so when three parts are stacked and connected at the same time (spotting or caulking), the two parts are spotted. However, in this embodiment, since it can be divided into two parts, it is difficult to come off.

  Further, the plate body 18 that forms the waveguide 2 while maintaining the connection strength between the matching plate 12 (conductor portion) and the heating chamber wall surface 31 by connecting with the crimping portions 125 and 125 as two connection points. And a connection point between the heating chamber wall surface and the heating chamber can be avoided.

  Moreover, since the avoidance part 124 is comprised by cutting the plate body which forms the connection part 121, the avoidance part 124 is easily realizable.

  Further, the arrangement of the matching plate 12 is often limited to a plurality of rotating antennas, and the matching plate 12 and the waveguide 2 are overlapped as shown in FIG. 7 (overlapping in the left-right direction in FIG. 8). Even if it becomes, the connection of the matching plate 12 to the heating chamber wall surface 31 and the connection between the plate 18 forming the waveguide 2 and the heating chamber wall surface 31 can be connected separately without interfering with each other. .

  Further, after the heating chamber wall 31 and the matching plate 12 (conductor portion) are integrated by caulking through the caulking portions 125, 125, the heating chamber wall 31 and the waveguide 2 are spotted at a number of spot points 17. By the manufacturing method connected by welding, the connection of the matching plate 12 (conductor portion) to the heating chamber wall surface 31 and the connection between the plate body 18 forming the waveguide 2 and the heating chamber wall surface 31 can be realized without any delay. If the order is reversed, the alignment plate 12 and the heating chamber wall surface 31 must be caulked after the waveguide 2 is formed, and the waveguide 2 becomes an obstacle and the caulking on the right side of FIG. Since the portion 125 cannot be connected by caulking, it is necessary to devise such as making a hole in the waveguide 2 and inserting a connection jig.

  Further, by setting the burr direction (protruding direction) of the caulking portions 125 and 125 to the inside of the heating chamber (upward in FIG. 8), the right caulking portion 125 also causes the burr (protruding portion) to enter the inside of the waveguide 2. ) Does not cause burrs to be generated in the waveguide 2 where the electric field strength is always strong, and it is possible to prevent the occurrence of sparks between the burr tip and the waveguide wall surface. Furthermore, if the burr direction (protrusion direction) of the right caulking portion 125 in FIG. 8 is downward, it may be impossible to connect the waveguide 2 by hitting the plate 18 forming the waveguide 2. It can also be prevented.

FIG. 9 is a plan view showing a modified example of the radiating portion of the rotating antenna. FIG. 9A shows a short side formed in a sickle shape, thereby increasing the creeping length of the short side end, The directivity of the microwave radiated from the tip side is strengthened. Further, (b) forms a short side along the T-shape, thereby further increasing the creeping length of the short side end portion and strengthening the directivity of the microwave radiated from the end tip side. . (C) By increasing the creeping length of the end of the short side and narrowing the width of the short side to concentrate the electric field of the microwave by forming the short side in a pickle shape, the radiation directivity is improved. It is what.

(Embodiment 2)
FIG. 10: is a figure which shows schematic structure of the microwave oven which is a microwave heating device of embodiment which concerns on this invention, and is the plane sectional view seen from upper direction.

  In FIG. 10, a single rotating antenna 19 is arranged at the center of the heating chamber bottom surface 31, and reflectors 20 and 21 integrated with the heating chamber bottom surface 31 are formed at each corner portion. The reflectors 20 and 21 include main bodies 201 and 211 and connecting portions 202 and 212 bent at right angles from the main bodies 201 and 211. The connecting portions 202 and 212 are integrated with the heating chamber bottom surface 31 by spot or caulking. ing. In FIG. 10, since the waveguide 2 is arranged in the lower right direction of FIG. 10 from the center in the cabinet, the position of the waveguide 2 and one of the reflectors 21 (conductor portion) overlaps. Therefore, the reflecting plate 21 (conductor portion) is different from the other reflecting plates 20 as shown in FIG. 11 and has an avoiding portion 213 that avoids the connection position between the waveguide 2 and the heating chamber wall surface 31. There are two connection portions 212 and 212, and an avoidance portion 213 is formed between the connection portions 212 and 212. The avoidance unit 213 is configured by cutting a plate from the connection unit 212 to the main body 211. Further, as described above, the reflection plate 21 (conductor portion) is arranged at the corner portion of the heating chamber 3 around the rotary antenna 19 and reflects the microwaves by the main body 211.

  Further, as a manufacturing method when the reflector 21 (conductor portion) and the waveguide 2 are integrated with the heating chamber wall surface 31, the heating chamber wall surface 31 and the reflector plate 21 (conductor portion) are spotted via the spot points 22. After integration by welding, the heating chamber wall surface 31 and the waveguide 2 are connected by spot welding at a number of spot points (not shown).

  Furthermore, by setting the burr direction (projection direction) when the heating chamber wall surface 31 and the reflector 21 (conductor portion) are integrated by spot processing to the inside of the heating chamber (upward in FIG. 11), the waveguide 2 The burr is not put out inside.

  The connection of the reflecting plate 21 (conductor portion) to the heating chamber wall surface has been described above, and the effect will be described. Unlike the other reflecting plates 20, the reflecting plate 21 (conductor portion) has an avoiding portion 213 that avoids the connection position between the waveguide 2 and the heating chamber wall surface 31. By connecting the tube 2 and the heating chamber wall surface 31, the connection of the reflector 21 (conductor portion) to the heating chamber wall surface 31 and the connection between the waveguide 2 and the heating chamber wall surface 31 do not interfere with each other. Can be connected separately. As a result, if the three parts of the heating chamber wall surface 31, the waveguide 2, and the reflector 21 (conductor part) are overlapped and connected at the same time (spotting or caulking), the two parts will be out of place compared to spotting. It is easy, but since it can be divided into two parts each, it has the effect of being hard to come off.

  In addition, since the avoidance portion 213 is formed between the connection portions 212 and 212, the connection portions 212 and 212 at the two locations can be guided while maintaining the connection strength between the reflector 21 (conductor portion) and the heating chamber wall surface 31. Connection between the wave tube 2 and the heating chamber wall surface 31 can be avoided.

  In addition, since the avoidance unit 213 is configured by cutting a plate from the connection unit 212 to the main body 211, the avoidance unit 213 can be easily realized.

  Further, the reflecting plate 21 (conductor portion) is arranged at the corner portion of the heating chamber 3 around the rotating antenna 19 and is configured to reflect the microwaves by the main body 211. However, the reflecting plate 21 (conductor portion) and the waveguide are guided. Even when the tube 2 overlaps, the connection between the reflector 21 (conductor portion) to the heating chamber wall surface 31 and the connection between the waveguide 2 and the heating chamber wall surface 31 do not interfere with each other. Can be connected separately.

  Further, as a manufacturing method when the reflector 21 (conductor portion) and the waveguide 2 are integrated with the heating chamber wall surface 31, spot welding is performed on the heating chamber wall surface 31 and the reflector 21 (conductor portion) via a spot point 22. Then, the heating chamber wall surface 31 and the waveguide 2 are connected by spot welding at a number of spot points, so that the reflector 21 (conductor portion) can be connected to the heating chamber wall surface 31 without delay. And the connection of the waveguide 2 and the heating chamber wall surface 31 is realizable. If the order is reversed, the conductor cannot be connected because the waveguide is in the way, so it is necessary to devise such as making a hole in the waveguide and inserting a connection jig.

  Furthermore, by setting the burr direction (projection direction) when the heating chamber wall surface 31 and the reflector 21 (conductor portion) are integrated by spot processing to the inside of the heating chamber (upward in FIG. 11), the waveguide 2 By using the manufacturing method in which no burrs are generated inside, it is possible to prevent the burrs from being generated in the waveguide 2 having a strong electric field strength. It is also possible to prevent the burr from hitting the wall surface of the waveguide 2.

  As another embodiment, if there is no problem in the strength of the conductor part, only one main body 231 and connection part 232 are formed in the conductor part 23 as shown in FIG. It is also conceivable to configure the avoiding unit 233.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the matters shown in the above-described embodiments, and those skilled in the art can make modifications and applications based on the description and well-known techniques. This is also the scope of the present invention, and is included in the scope of seeking protection.

  In particular, the antenna may have a plurality of different antennas or a rotating waveguide. It is also easy to arrange a plurality of alignment plates.

  In addition to the matching plate and the reflecting plate, some conductor part may be configured in the heating chamber, and any part other than the waveguide may be configured to overlap the conductor part outside the heating chamber. unknown. The present invention is applicable to such a case.

  The microwave heating device of the present invention has an effect of preventing local overcooking when controlling the heating distribution by the orientation of a plurality of rotating antennas, and a microwave oven, a microwave oven as a cooking utensil using microwaves, It is useful for various dielectric heating and thawing devices, semiconductor devices using microwaves, heating devices in industrial fields such as drying devices, ceramic heating, sintering or biochemical reaction.

Plan sectional drawing which shows schematic structure of the microwave heating apparatus in Embodiment 1 of this invention Same sectional view showing schematic configuration of microwave heating apparatus The top view which shows the shape of the rotation antenna of the microwave heating device Front view showing the shape of the matching plate of the microwave heating apparatus (A) is a characteristic diagram showing the temperature distribution of the mainspring of the conventional microwave heating device, (b) is a characteristic diagram showing the temperature distribution of the mainspring of the microwave heating device in the embodiment of the present invention. Plan view showing arrangement of rotating antenna, matching plate, and spring The top view of the alignment board vicinity of the microwave heating apparatus in Embodiment 1 of this invention Same as above, front sectional view of the vicinity of matching plate of microwave heating device (A) (b) (c) is a top view which shows the rotating antenna structure of the microwave heating apparatus in other embodiment of this invention. Plan sectional drawing which shows schematic structure of the microwave heating apparatus in Embodiment 2 of this invention The perspective view of the matching plate of the microwave heating apparatus The perspective view of the matching plate of the microwave heating device in other embodiment of this invention Plan sectional view showing a schematic configuration of a conventional microwave heating apparatus The perspective view of the matching plate of the microwave heating apparatus

Explanation of symbols

1 Magnetron (microwave generator)
2 Waveguide 3 Heating chamber 8, 19 Rotating antenna 12 Matching plate (conductor part)
21 Reflector (conductor)
23 Conductor part 31 Heating chamber wall surface 121, 212, 232 Connection part 122, 211, 231 Main body 124, 213, 233 Avoidance part

Claims (7)

A microwave generation unit that generates a microwave, a heating chamber that houses an object to be heated by the microwave, a waveguide that propagates the microwave from the microwave generation unit to the heating chamber, and the waveguide A conductor portion integrated on the opposite surface of the heating chamber wall surface connected to the tube, the conductor portion including a main body, a connection portion connected to the heating chamber wall surface, the waveguide and the heating; A microwave heating apparatus having a configuration including an avoidance unit that avoids a connection position of a room wall surface. The microwave heating device according to claim 1, wherein there are at least two connecting portions, and the avoiding portion is configured between the connecting portions. The microwave heating apparatus according to claim 2, wherein the avoiding unit is configured by cutting a plate body that forms the connecting unit. It has a plurality of rotating antennas that radiate microwaves from the waveguide to the heating chamber, the conductor portion is disposed between the plurality of rotating antennas, and the main body is configured to form a matching plate that prevents the concentration of microwaves. The microwave heating apparatus according to claim 1. It has a rotating antenna that radiates microwaves from the waveguide to the heating chamber, the conductor is arranged at the corner of the heating chamber around the rotating Anna, and the main body forms a reflector that reflects the microwave The microwave heating apparatus according to claim 1, which is configured. The microwave heating apparatus according to claim 1, wherein the heating chamber wall surface and the waveguide are connected after the heating chamber wall surface and the conductor portion are integrated. The microwave heating apparatus according to claim 6, wherein a burr direction when the heating chamber wall surface and the conductor portion are integrated is directed to the inside of the heating chamber so that no burr is generated inside the waveguide.