JP2005180733A - High frequency heating device with heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency heating device with a heater capable of neatly grilling food by a heater in a heating chamber bottom face by suppressing uneven grilling on a rim part of a metal grill for the heater. <P>SOLUTION: A composition is provided having the heater 33 of the heating chamber bottom face 32, the metal grill 19 for the heater covering the whole bottom face of a heating chamber, and a dielectric plate 26 for a cooking range that is smaller than the metal grill 19. By this, since the metal grill 19 covers the whole bottom face 32 of the heating chamber, an effective area for placing food on the metal grill 19 including four corners can be increased, and since the rim part 22 of the metal grill 19 becomes closer to a side face of the heating chamber and it becomes harder to place food on the rim part 22, uneven grilling on the rim part 22 is suppressed, and food can be neatly grilled by the heater of the heating chamber bottom face 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high frequency heating apparatus with a heater that heats an object to be heated with a heater and a microwave, and particularly relates to a structure of a metal net for a heater and a dielectric dish for a range.

  Microwave ovens, which are typical high-frequency heating devices with heaters, are mainly for families and have a large internal volume. This is because a large amount of food can be cooked, such as simultaneously heating a plurality of foods or baking large foods at once. Furthermore, in the case of the range heating, the shape of the dielectric dish for the range is enlarged to the limit of the wall surface of the heating chamber so that three or four foods can be placed at the same time. However, in the case of heater heating, it is known that when the internal volume increases, the heat of the heater spreads throughout the heating chamber, so that the rising speed of heating is slowed down. For example, the time to bake toast is much faster in the oven toaster than in the microwave oven. By the way, when the oven volume and oven toaster compare the storage volume and the baking time of two toasts, the oven toaster with a storage capacity of 7-8L is about 2 minutes, and the oven range with a storage capacity of 15L is more than 4 minutes. It is common.

  When toast is baked on a metal mesh, the top surface of the toast is baked uniformly, while the bottom surface of the toast may be burnt in the shape of the metal mesh. This is because the heat on the bottom heater is blocked by the mesh bar, so that the part on the mesh bar is not burned and only the part on the mesh hole is burnt. This burnt eye can be considered as a kind of burning unevenness, but if the burnt eyes are regularly arranged, the difference in texture between the burnt and the other will also enhance the taste.

  Regarding baking time, first, when baking efficiently in a short time like a conventional oven toaster, it is possible to quickly burn only the surface before the heat is transferred to the inside, the surface is crispy and the inside is very soft Delicious baking is obtained. And since the burnt on the lower surface of the toast due to the metal mesh appears clearly, the shape of the metal mesh is important for the finish.

  On the other hand, if it does not burn unless it is applied for a long time like a microwave oven, heat will be transferred to the inside before scorching the surface, and drying will proceed, so you must stop heating before it gets burnt . With this, there is no difference in texture between the surface and the interior, and there is no fragrance due to burnt eyes, resulting in a baked that is not so delicious. And since it doesn't get very burnt, the shape of the metal net has little effect on the result. The microwave oven has a longer baking time than the oven toaster, so there is little influence of the metal net shape on the burnt and it has not been a problem.

  In recent years, the nuclear family and the declining birthrate have advanced, and the ratio of living alone and living alone has increased. They live in studio apartments where there is no kitchen or where the kitchen is small, and they often live with little cooking utensils. When the number of people is small, the amount of food to eat is small, so a product with a large volume is not particularly necessary, and a space-saving device may be devised by placing a microwave oven with a small internal volume on a refrigerator with a small volume. At such times, it is difficult to secure a separate storage space for the oven toaster, so there is a need for a single unit that combines the functions of a microwave oven and an oven toaster. Also, they often work for some job, and if they work, they are busy, so it is desirable to have a short cooking time. Therefore, it is considered that there is a need for a toast to be deliciously baked in a short time with a smaller internal volume than the current microwave oven.

  Next, a description will be given of the current configuration of the heater metal net and the dielectric dish for the range.

  First, a microwave oven, which is a typical high-frequency heating device, does not have a heater because it has no heater, and has only a dielectric dish for the range. A structure (turntable) for rotating a dielectric dish for a range on which food is placed is well known for uniformizing the heating distribution by microwaves. FIG. 11 shows a typical configuration. The dielectric dish 1 for the range is made of a dielectric material such as glass. It is transmitted to the dish 1. The plurality of rollers 6 are rotatably mounted on the ring 7 so as to be able to rotate smoothly while holding the dielectric dish 1. In addition, the protrusion 8 of the range dielectric dish 1 (which corresponds to a so-called tailing) is formed in a circular shape on the outside of the roller 6, and the heating chamber bottom surface 9 is inclined upward on the outside of the roller 6. The roller 6 is prevented from shifting outward even when rotated. Here, the coupler 4, the roller 6, the ring 7, and the like are also made of a dielectric (for example, see Patent Document 1).

  Secondly, in a microwave oven that is a typical high-frequency heating device with a heater, there is a configuration in which not only a dielectric plate for a range but also a metal mesh for a heater for placing and baking toast is rotated (for example, Patent Document 2). reference).

  FIG. 12 shows a typical configuration in which the rotational force of the motor 2 is transmitted to the metal net 11 via the rotary shaft 3 and the bearing 10. Accordingly, the metal net 11 rotates, and if the range dielectric dish 12 made of a dielectric material such as ceramic is disposed on the heater metal net 11, the range dielectric dish 12 also rotates together. Thus, when used as a microwave oven, the dielectric dish 12 for the range is disposed and the food is microwave-heated on the dielectric dish 12 for the range, whereas when the toast is baked, the dielectric dish 12 for the range is used. Is removed, and the food (toast) is heated by the heater on the metal net 11 for the heater.

  Further, since the projection dielectric plate 12 having a diameter slightly larger than the outer shape of the heater metal net 11 is formed on the range dielectric dish 12, the dielectric dish for range on the metal net 11 for heater. It is the structure which can position and fix 12 from the inside. Although the outer shape of the dielectric dish 12 for the range is formed in a circular shape, the protrusion 13 (tearing) may be formed in a circular shape or a plurality of protrusions may be arranged in a satellite. Here, while the range dielectric dish 12 has a large area extending to the vicinity of the heating chamber side surface 14, the heater metal net 11 is smaller than the protrusion 13 of the range dielectric dish 12, so that the heating chamber It becomes a small external shape away from the side surface 14.

  Further, when the heater metal net 11 is viewed from above, it is not a circle but a rectangle or an ellipse as shown in FIG. Most of the metal mesh 11 for heater is made of a conductor plate, and has a central portion 16 having a hole 15 and an edge portion 17, and a crosspiece is formed vertically and horizontally in the central portion 16 by the hole 15. Further, the edge portion 17 has a so-called curling shape in which a terminal end is folded inwardly downward, and the heater metal net 11 is reinforced by this curling shape and is not easily deformed. Here, the two-dot chain line shows the outer shape of the two pans 18 for toast. Most of the pan 18 protrudes outside the edge 17 but most of the pan 18 is placed on the heater metal net 11. And can be held stably.

  Moreover, about the shape of the metal mesh for heaters, the thing like FIG. 14 is shown elsewhere (for example, refer patent document 3).

  Here, in order not to collide with the wall surface of the heating chamber even when rotated, the heater metal net 11 is formed in a circular shape. The heater metal mesh shown in FIG. 14 may be considered as an outer shape of the heater metal mesh shown in FIG. Now, in FIG. 14, most of the pan 18 that protrudes only from the left and right edges 17 is placed on the heater metal net 11 and can be stably held.

  Now, the rotation of the metal net 11 when the toast is baked with the range dielectric dish 12 removed in FIG. 12 will be explained a little more. Originally, the reason for rotating was to make the heating distribution of the microwave oven uniform. However, as shown in FIG. 12, various parts including the motor 2 are mounted on the lower side of the heating chamber floor 9, which limits the arrangement of the heaters. For example, in FIG. 12, since the motor 2 is on the right, the heater can be arranged mainly on the left side. Therefore, when the metal net 11 is stopped, heating on the left side of the toast mainly proceeds while heating on the right side is delayed, resulting in uneven heating. Therefore, the metal net 11 is rotated to eliminate the heating unevenness on the left and right sides, thereby realizing uniform heater heating.

  However, there are disadvantages due to rotation. A general microwave oven has a substantially rectangular parallelepiped shape and the floor surface is rectangular, but the dielectric dish and the metal net may be circular as shown in FIG. 14, for example. This is in order not to hit the wall of the heating chamber when the dielectric plate and the metal net are rotated. Therefore, food cannot be placed around the metal net (especially at the four corners). For example, even if there is an area of 4 pans as the floor area of the heating chamber, only 2 sheets can be placed on the metal mesh, or only 1 sheet can be placed if the shape of the metal mesh is extremely small. Also actually happening. This is a major issue for turntables. And in recent large-sized microwave ovens, in order to increase the effective area in the heating chamber, a product that uses a flat bottom that is not a turntable has been released. Therefore, even in a small range, there must be a gradual shift to one that does not rotate the dielectric plate or metal mesh.

When the metal mesh is further rotated, the positions of the mesh holes and the crosspieces change every moment, so that the electric field distribution of the microwave when using the microwave oven is changed. In particular, misuse such as operation without food can cause local concentration of electric field on the net. Therefore, the location where the electric field is concentrated changes during one rotation of the metal mesh, but in any case, it is necessary to prevent sparks from occurring. As shown in FIG. 12, if the insulation distance between the metal net 11 and the heating chamber bottom surface 9 and the insulation distance between the metal net 11 and the heating chamber side surface 14 are sufficient, there is also a problem that sparks are unlikely to occur. On the other hand, since the dielectric dish 12 is not metal, no spark occurs even near the side surface 14 of the heating chamber. Therefore, it is easy to make the circle larger in diameter than the metal net 11. If the dielectric dish is made larger than the metal mesh, the protrusion (tearing) on the bottom surface of the dielectric dish is formed slightly larger than the outer shape of the metal mesh, so that it can be positioned on the metal mesh from the inside of the dielectric dish. Fixing is a fixing method that is very naturally conceived.
Japanese Patent No. 2837158 Utility Model Registration No. 3043649 JP-A-11-193931

  However, in the conventional configuration, the heater metal mesh is smaller than the range dielectric dish, and the strength is increased by curling the edge of the heater metal mesh. Therefore, when a part of the bread is placed on the edge of the metal mesh for the heater, such as two pieces of bread or food such as a long and narrow fish, the bottom of the heating chamber When viewed from the heater on the side, there are double mesh bars on the curling of the edge, which makes it harder to burn than the other parts. As a result, there was a problem that the underside of the food was unevenly cooked, and the appearance and texture were not good.

  The present invention solves these problems, and it is an object of the present invention to prevent baking unevenness on the edge of the metal mesh for the heater and to bake the food cleanly with the heater on the bottom of the heating chamber.

  In order to solve the conventional problems, a high-frequency heating apparatus with a heater according to the present invention includes a heater on a bottom surface of a heating chamber, a metal mesh for a heater over the entire bottom surface of the heating chamber on the heater, and on the metal mesh. It is set as the structure which has the dielectric dish for ranges smaller than the said metal net | network.

  As a result, the metal mesh for the heater extends over the entire bottom surface of the heating chamber, so that the effective area where food can be placed on the metal mesh including the four corners of the bottom surface of the heating chamber can be increased, and the edge of the metal mesh can be Since the food is difficult to be placed on the edge because it is close to the side surface, it becomes difficult to cause uneven burning on the edge, and the food can be neatly baked with the heater on the bottom of the heating chamber.

  The high-frequency heating apparatus with a heater of the present invention makes it difficult to cause uneven burning on the edge of the metal mesh for the heater, and allows the food to be baked cleanly with the heater on the bottom of the heating chamber.

  1st invention is a high frequency heating apparatus with a heater, the heater of the bottom face of a heating chamber, the metal mesh for heaters covering the whole bottom face of the said heating chamber on the said heater, and a range smaller than the said metal mesh on the said metal mesh It is set as the structure which has a dielectric material plate.

  As a result, the metal mesh for the heater extends over the entire bottom surface of the heating chamber, so that the effective area where food can be placed on the metal mesh including the four corners of the bottom surface of the heating chamber can be increased, and the edge of the metal mesh can be Since the food is difficult to be placed on the edge because it is close to the side surface, it becomes difficult to cause uneven burning on the edge, and the food can be neatly baked with the heater on the bottom of the heating chamber.

  In the second invention, in particular, in the high-frequency heating apparatus with a heater according to the first invention, the bottom of the dielectric dish is positioned from the outside by a metal net. Thereby, since the metal net becomes larger than the bottom of the dielectric dish, the metal net can be prevented from becoming smaller than the dielectric dish, and the first invention can be easily realized.

  In the third aspect of the invention, particularly in the high-frequency heating apparatus with a heater of the second aspect of the invention, the bottom of the dielectric dish is positioned from the outside by the step on the upper surface of the metal net. As a result, the upper surface of the metal mesh becomes larger than the bottom of the dielectric dish, so that the metal mesh can be prevented from becoming smaller than the dielectric dish, and the second invention can be easily realized.

  According to a fourth aspect of the invention, in particular, in the high frequency heating apparatus with a heater of the third aspect of the invention, the metal net has an edge portion and a central portion lower than the edge portion so that a step is formed on the upper surface. As a result, the central portion is larger than the bottom of the dielectric dish, so that the metal net can be prevented from becoming smaller than the dielectric dish, and the third invention can be easily realized.

  According to a fifth aspect of the invention, in particular, in the high-frequency heating apparatus with a heater according to the second aspect of the invention, the bottom of the dielectric dish is positioned from the outside by the holes of the metal mesh. As a result, one end of the hole of the metal mesh is located outside the bottom of the dielectric dish, so that the metal mesh can be prevented from becoming smaller than the dielectric dish, and the second invention can be easily realized. Can do.

  According to a sixth aspect of the invention, in the high frequency heating apparatus with a heater of the fifth aspect of the invention, the dielectric plate has a protrusion on the bottom surface, and the protrusion is fitted in the hole of the metal net. As a result, one end of the hole of the metal mesh is positioned outside the protrusion on the bottom surface of the dielectric dish, so that the metal mesh can be prevented from becoming smaller than the dielectric dish, and the fifth invention is easily realized. can do.

  In the seventh aspect of the invention, in particular, in the high frequency heating apparatus with a heater of the second aspect, the bottom of the dielectric dish is positioned from the outside by the insulating legs integrated around the metal net. As a result, the legs are outside the bottom of the dielectric dish, so that the metal net integrated with the legs can be prevented from becoming smaller than the dielectric dish, and the second invention is easily realized. can do.

  According to an eighth aspect of the present invention, in the high frequency heating apparatus with a heater of the seventh aspect of the invention, a stopper for positioning the dielectric dish is formed at the upper end of the leg portion. Accordingly, since the stopper is located outside the bottom of the dielectric plate, it is possible to prevent the metal net integrated with the leg portion having the stopper from becoming smaller than the dielectric plate, thus facilitating the seventh invention. Can be realized.

  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 to 4 show a first embodiment of a high-frequency heating apparatus with a heater according to the present invention.

  Fig. 1 is a block diagram of a metal net and a dielectric plate, Fig. 2 is a block diagram of components forming a heating chamber, Fig. 3 is a cross-sectional block diagram of a high-frequency heating apparatus with a heater as viewed from the front, and Fig. 4 is also viewed from the right. FIG.

  The metal net 19 is a metal having a central portion 21 having a large number of holes 20 by press working, an edge portion 22 having a height higher than the central portion 21, a step 23 formed between the central portion 21 and the edge portion 22, and the like. A plate 24 and leg portions 25 made of an insulating material such as resin, ceramic, or rubber covering the periphery of the metal plate 24 are provided. The dielectric dish 26 is a dish made by molding a dielectric material such as resin, ceramic, or glass. The dielectric plate 22 is placed on the center portion 21 of the metal net 19 by placing the bottom 27 of the dielectric plate 22 on the outside by the step 23. It is the structure positioned from.

  In the heating chamber 28, the left side surface 29, the rear surface 30 and the right side surface 31 are made of a common wall member as shown in FIG. 2, but this member is made of a material previously coated with fluorine, and each wall surface is soiled. It is difficult to wipe off dirt. A horizontally long tube heater 33 is mounted as a heater at the lower center of the bottom surface 32, and the periphery is covered with a reflecting plate 34, so that radiation heating from below is made uniform. The ceiling surface 35 is provided with a tube heater 37 as a heater in a horizontally elongated aperture 36 on the near side, and the shape of the aperture 36 makes uniform radiation heating from above. Since both the floor surface 32 and the ceiling surface 35 are heated by the tube heaters 33 and 37, they are constituted by other members not coated with fluorine.

  In addition, an opening 38 on the center side of the heating chamber and an opening 39 on the periphery side of the heating chamber are disposed behind the ceiling surface 35 and substantially in the center in the left-right direction. The microwave transmitted through the waveguide 40 is irradiated into the heating chamber 28 from the openings 38 and 39 formed on the upper surface. Here, the heating chamber 28 is formed by five wall surfaces (the left side surface 29, the rear surface 30, the right side surface 31, the bottom surface 32, and the ceiling surface 35), and constitutes a space for heating an object to be heated (not shown). ing. The left side surface 25, the rear surface 26, the right side surface 27, the floor surface 28, the ceiling surface 31 and the waveguide 36 forming the heating chamber 28 are mechanically and electrically connected by electric resistance welding (projection welding, spot welding) or caulking. Are joined together. 4 is configured to be able to open and close the heating chamber 28. The magnetron 42 generates microwaves from the radiation antenna 43, and the microwaves are transmitted from the center rear of the ceiling surface 35 into the heating chamber 28 through the waveguide 40 and the openings 38 and 39. It is the structure which heats the to-be-heated object (not shown) arrange | positioned in the inside.

  In the present embodiment, the microwave is guided into the heating chamber 28 from the ceiling surface 35 while the magnetron 42 is disposed on the right side surface 31 side. The heating distribution due to can be made uniform to some extent. Further, when the magnetron 42 is arranged on the right side 31 side, the parts can be arranged together on the right side 31 as in the prior art, so that efficient component arrangement is possible. At the same time, the magnetron 42 does not have to be disposed on the ceiling surface 35 side, so that the dead space on the ceiling surface 35 side can be reduced, and a compact configuration can be realized particularly in the vertical direction. As described above, even if the inside height is lowered, there are few harmful effects. Therefore, it is easy to shorten the baking time for toast and the like by improving the heater performance by reducing the inside height. In the present embodiment, the shape of the aperture 36 is optimized for the tube heater 37 that is the upper heater, and the reflector 34 is optimized for the tube heater 33 that is the lower heater. While improving the heater distribution, the inside height Ha is reduced to about 145 mm to improve efficiency. (By the way, the inner width is 285 mm, the depth is 270 mm) And, for example, the pan 18 is placed directly on the central portion 21 of the metal net 19 with the dielectric plate 26 removed as shown by the two-dot chain line in FIG. It is possible to efficiently bake from both the upper and lower sides, and the toast baking time can be shortened to about 3 minutes as in an oven toaster even with a commercial commercial power supply (100 V, 15 A). When microwave heating is performed, the dielectric dish 26 is mounted on the metal net 19 and food is placed thereon.

  The cover 44 may be made of a material that is easy to process, has strength, and has low high-frequency dielectric loss, and may be mica as in the past.

  Now, according to the present embodiment, the metal net 19 secures an insulation distance from each wall surface of the heating chamber 28 (particularly, the bottom surface 32, the left side surface 29, the rear surface 30, the right side surface 31, and the door 41) by the legs 25. However, it is the structure arrange | positioned over the whole bottom face 32 of the heating chamber 28, especially the structure which can put a foodstuff to the four corners of a heating chamber floor, The conventional circular metal net | network of FIG. 13, FIG. The effective area where food can be placed can be increased compared to.

  Further, the metal net 19 is larger than the metal net 11 of FIGS. 13 and 14 and the edge 22 is close to the side surface of the heating chamber, so that it is difficult to place food on the edge 22. This makes it difficult to cause uneven burning of food, and the heater 33 under the heating chamber bottom surface 32 can clean the food. In particular, the edge portion 22 is higher than the central portion 21 and can be placed on the central portion 21 even when the food is two pieces of bread 18. Since the radiant heat to the pan 18 is not blocked, there is no influence on the baking, and the baking can be done neatly.

  In addition, the metal net 19 has the edge portion 22 and the central portion 21 lower than the edge portion 22, thereby having a step 23 on the upper surface. Further, the bottom 27 of the dielectric plate 26 is positioned from the outside by a step 23 that is slightly wider outside the bottom 27. As a result, the central portion 21 is larger than the bottom portion 27 of the dielectric plate 26, and as a result, the area of the central portion 21 of the metal net 19 is larger than the area inside the dielectric plate 26. Thus, the area of the metal net 19 can be prevented from becoming smaller than that of the dielectric dish 26, and the effective area where food can be placed on the metal net can be increased.

  In the case of the present embodiment, in order to attach the dielectric dish 26 to the metal net 19, the dielectric dish 26 may be dropped into the central portion 21 lower than the edge portion 22. Therefore, mounting is easy. On the other hand, in the past, since the dielectric plate was placed on a metal mesh smaller than the size of the dielectric plate, it was difficult to tell whether the metal mesh had entered the tin plate, and the dielectric plate was moved. It was necessary to check whether or not the plate was placed. At this time, the plate was moved too much and could hit the dielectric plate against the wall. This embodiment has an effect of preventing this. This is because, in the present embodiment, the dielectric dish is positioned from the inside by a metal mesh smaller than itself, whereas in this embodiment, the dielectric dish is positioned and fixed from the outside by a metal mesh larger than that of itself. It is done.

  In addition, if it is set as the structure which is not a turntable like this Embodiment, since there are no components, such as a motor, in the lower part of the bottom face 32, a heater can be arrange | positioned freely. As a result, it is possible to easily improve the efficiency of heater heating and make the distribution uniform from below. Therefore, even if the metal net 19 is configured to cover the entire bottom surface 32 and food is placed at the four corners, it can be satisfactorily satisfied.

  Further, since the positions of the holes and the crosspieces of the metal mesh are always constant because the metal mesh does not rotate, the electric field distribution of the microwave when using the microwave oven hardly changes. Even if it is misused, especially when it is operated without food, local electric field concentration occurs on the metal mesh bar, it is always the same place. Therefore, the design for avoiding the spark due to the concentration of the electric field is such that only the location is separated from the other wall surface to increase the insulation distance, the hole shape is changed only at that location, or the end face R is increased only at that location. In addition, measures that focus on the location are effective. On the other hand, in the case of the conventional turntable, it is necessary to prevent sparks from occurring constantly while the concentration of electric field changes every moment while the metal net rotates once. In addition, it is considered that it is greatly affected by the inclination of the rotating shaft. Therefore, in the case of a turntable, the insulation distance between the metal net and the floor or wall surface must be increased. On the other hand, when the metal net does not rotate as in the present embodiment, it is not necessary to take an excessive insulation distance, and it can be brought closer to the wall surface. Therefore, the area of the metal net can be increased, that is, the effective area can be increased.

(Embodiment 2)
5 to 7 show a second embodiment of the high-frequency heating apparatus with a heater according to the present invention. FIG. 5 is a configuration diagram of a metal net and a dielectric plate, FIG. 6 is a cross-sectional configuration diagram of the high-frequency heating apparatus with a heater as viewed from the front, and FIG.

  The dielectric dish 26 has a protrusion 45 on the bottom surface, and the protrusion 45 is fitted in the hole 20 of the metal net 19. Further, the metal net 19 is detachable on an insulating rail 46 attached in advance to the left side surface 29 and the right side surface 31 of the heating chamber 28. A metal distribution adjusting chamber 47 is disposed behind the ceiling surface 35 and substantially in the center in the left-right direction. The microwave transmitted through the waveguide 40 is guided into the distribution adjusting chamber 47 from the opening 48 formed on the upper surface, passes through the periphery of the antenna 49 fixed in the distribution adjusting chamber 47, and is heated. It is the structure radiated to.

  Now, according to the present embodiment, the metal net 19 secures an insulation distance from each wall surface of the heating chamber 28 (in particular, the bottom surface 32, the left side surface 29, the rear surface 30, the right side surface 31, and the door 41) by the rail 46. Moreover, it is the structure arrange | positioned over the whole bottom face 32 of the heating chamber 28, and the effective area which can put a foodstuff can be increased compared with the conventional circular metal net.

  The dielectric dish 26 has a protrusion 45 on the bottom surface, and the protrusion 45 is fitted in the hole 50 of the metal net 19. Thus, one end of the hole 50 of the metal net 19 is positioned outside the protrusion 45 on the bottom surface of the dielectric dish 26, and the dielectric dish 26 is positioned and fixed from the outside by the metal net 19. Thereby, it can prevent that the metal net | network 19 becomes smaller than the dielectric material dish 26, and the effective area which can put a foodstuff on the metal net | network 19 can be increased.

(Embodiment 3)
8 and 9 show a third embodiment of the high-frequency heating apparatus with a heater according to the present invention. FIG. 8 is a configuration diagram of the metal net and the dielectric plate, and FIG. 9 is a cross-sectional configuration diagram of the state where the dielectric plate is mounted on the metal net.

  The dielectric plate 26 has a binding (bottom) 51 on the lower surface, and the metal net 19 is formed by integrating legs 52 made of an insulator at four corners, and has holes 53 and 54 having different shapes. . The leg 52 has a configuration in which a stopper 55 is formed at the upper end, and the dielectric plate 26 is positioned and fixed to the metal net 19 between the inside of the stopper 55 and the outside of the binding 51.

  Now, according to the present embodiment, the metal net 19 has a configuration that can be arranged over the entire floor surface of the heating chamber while securing the insulation distance from each wall surface of the heating chamber by the leg portion 52. Compared with a circular metal net, the effective area where food can be placed can be increased.

  Further, the stoppers 55 are located outside the tailings 51 by the bindings 51 of the dielectric 26 and the stoppers 55 at the upper ends of the legs 52 of the metal net 19, so that they are integrated with the legs 52 having the stoppers 55. The metal net 19 can be prevented from becoming smaller than the dielectric dish 26, and the effective area where food can be placed on the metal net 19 can be increased.

(Embodiment 4)
FIG. 10 shows a fourth embodiment of the high-frequency heating apparatus with a heater according to the present invention. FIG. 10 is a view of the heating chamber as viewed from above, and is a cross-sectional configuration diagram in a state where the metal net 19 is attached.

  The metal net 19 is circular and rotates in the same manner as in the prior art. However, the heating chamber wall 56 has a left side surface, a rear surface, and a right side surface that are integrally formed and has a semicircular shape at the rear, and has no corners at the rear, so as not to create a useless space where food cannot be placed. doing. Thus, even with the circular metal net 19, the effective area where food can be placed can be widened with respect to the heating chamber. Further, the metal net 19 of the present embodiment has a structure that is much wider than the conventional metal net 11 of FIG. 14 and can be arranged so that the pan 18 does not cover the edge 22 of the metal net 19.

  In each of the embodiments, an example in which a metal net is created by pressing a metal plate is shown, but the present invention is not limited to this. It can be easily considered that the metal net is made of wire.

  As described above, it has been shown that the high-frequency heating apparatus with a heater according to the present invention can increase the effective area for placing food on a metal net. This is not limited to the toaster range, and can be applied to equipment for heating, drying, sterilization, sintering, and melting using a heater and a microwave.

Configuration diagram of metal mesh and dielectric plate of high-frequency heating apparatus with heater in Embodiment 1 of the present invention Same as above, configuration diagram of the components that make up the heating chamber Same as above, sectional view from the front Same as above, cross-sectional configuration diagram Configuration diagram of metal mesh and dielectric plate of high-frequency heating apparatus with heater in Embodiment 2 of the present invention Same as above, sectional view from the front Same as above, cross-sectional configuration diagram Configuration diagram of metal mesh and dielectric plate of high-frequency heating apparatus with heater in Embodiment 3 of the present invention Same as above, cross-sectional configuration diagram of metal mesh and dielectric plate Cross-sectional block diagram seen from the top of the high frequency heating apparatus with a heater in Embodiment 4 of this invention Cross-sectional configuration diagram of a conventional microwave oven Cross-sectional configuration diagram of a conventional microwave oven Configuration diagram of conventional microwave oven metal mesh Configuration diagram of other conventional microwave oven metal mesh

Explanation of symbols

19 Metal Net 21 Center 22 Edge 23 Step 26 Dielectric Plate 27 Bottom 32 Bottom 33 Tube Heater (Heater)
45 protrusion 50 hole 51 tail (bottom)
52 Leg 55 Stopper

Claims (8)

High-frequency heating with a heater having a heater on the bottom of the heating chamber, a metal mesh for the heater over the entire bottom surface of the heating chamber on the heater, and a dielectric dish for a range smaller than the metal mesh on the metal mesh apparatus. The high-frequency heating apparatus with a heater according to claim 1, wherein the bottom of the dielectric dish is positioned from the outside by a metal net. The high frequency heating apparatus with a heater according to claim 2, wherein the bottom of the dielectric dish is positioned from the outside by a step on the upper surface of the metal net. The high-frequency heating apparatus with a heater according to claim 3, wherein the metal net has an edge portion and a central portion that is lower than the edge portion, so that the upper surface has a step. The high frequency heating apparatus with a heater according to claim 2, wherein the bottom of the dielectric dish is positioned from the outside by a hole in the metal mesh. 6. The high frequency heating apparatus with a heater according to claim 5, wherein the dielectric plate has a protrusion on a bottom surface, and the protrusion is fitted in a hole of a metal net. The high frequency heating apparatus with a heater according to claim 2, wherein the bottom of the dielectric plate is positioned from the outside by insulating legs integrated around the metal net. The high-frequency heating apparatus with a heater according to claim 7, wherein a stopper for positioning the dielectric dish is formed at an upper end of the leg portion.

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