JP2007315728A - High frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency heating device capable of effectively preventing leakage of high frequency by improving a structure of a door. <P>SOLUTION: This high frequency heating device 100 comprises a main body 10 having a heating chamber 11 provided with an opening portion 12 on its front face, and the door 20 disposed on the main body 10 to openably cover the opening portion 12, and having a choke structure 21 formed by folding a metallic plate 24 several times on its outer peripheral portion 29, a projecting portion is formed on the outer peripheral portion at a heating chamber side, of the door 20, and a high frequency propagation path 50 is formed by the door 20 and an inner wall face of the heating chamber 11 in a state of closing the door 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high-frequency heating device such as a microwave oven, and more particularly to a high-frequency heating device characterized by the structure of a door.

  Conventionally, in a high-frequency heating apparatus such as a microwave oven, cooking is performed using high-frequency (2.45 GHz (gigahertz) microwave). If such a high frequency leaks outside the high frequency heating device during cooking, it will have an undesirable effect on the human body. Therefore, various measures for preventing high-frequency leakage are taken in the high-frequency heating device. Among them, a countermeasure against high frequency that tends to leak from the gap between the door and the main body of the high frequency heating device is particularly important.

  As a measure to suppress the amount of high-frequency leakage that leaks from the gap between the door and the high-frequency heating device main body, there has conventionally been a structure called a choke structure in which the outer periphery of a metal plate constituting the door is bent into a bag path shape and processed. . The principle of this choke structure is that the high frequency that is going to leak from the gap between the door and the high-frequency heating device body is guided into the bag path of the choke structure, reflected at the end of the bag path, and the reflected wave is guided into the bag path. This is a combination of high frequency and maximum voltage and minimum current at the entrance of the choke structure.

  That is, the maximum impedance at the entrance of the choke structure is maximized and the current is minimized so that the apparent impedance is infinite (∞), and the amount of high-frequency leakage from the gap between the door and the high-frequency heating device body Is to eliminate or reduce. Therefore, in such a choke structure, the distance from the entrance portion of the gap between the door and the high-frequency heating device body to the entrance portion of the choke structure, and the distance from the entrance portion of the choke structure to the end of the bag path, Each is set to be about ¼ of the wavelength used, and is configured such that the reflected wave and the high frequency to be leaked are combined in opposite phases at the entrance portion of the choke structure.

  As such, “a main body having an internal space in which high frequency is supplied to the internal space; a door that is attached to the main body so that the internal space can be opened and closed and whose outer peripheral portion is made of a metal plate; And a choke groove formed by bending the outer peripheral metal plate 5 times, each of the first to fifth bent portions of the choke groove having a bending angle of 90 °. The depth of the groove by the folding and the dimension between the first folded part and the second folded part are about 11 mm, respectively, and the dimension between the second folded part and the third folded part. Is about 16 mm, the first dimension between the fourth and fifth bent portions and the second dimension between the fifth bent portion and the end of the metal plate are 11.5 mm. Each value between during and 7.5mm~1.0mm of 14.5mm is set, the high-frequency heating apparatus "is proposed (e.g., see Patent Document 1).

JP 2000-291959 A (page 7, FIG. 4)

  The high-frequency heating device described in Patent Document 1 can reduce the thickness of the choke groove by setting the dimension between the bent portions constituting the choke structure to be thin, and accordingly the door can be made lighter and thinner. It was. That is, this high-frequency heating device is a device in which the choke structure itself is devised based on the properties of high-frequency to suppress the amount of high-frequency that tends to leak outside the high-frequency heating device.

  Certainly, it is effective to devise the choke structure itself as a measure for suppressing the amount of high-frequency leakage. However, it is not possible to suppress all of the high frequencies that are leaked by the choke structure alone. Therefore, it is desirable to secure a high-frequency propagation path leading to the choke structure, and to attenuate the high frequency in this high-frequency propagation path before guiding it to the choke structure. If such a high-frequency propagation path can be secured, the choke structure itself can be reduced in size. That is, the door provided with the choke structure can be reduced in weight and thickness.

  The present invention has been made in order to solve the above-described problems. A high-frequency heating apparatus that can effectively suppress the amount of high-frequency leakage by securing a high-frequency propagation path by devising the door structure. It is to provide.

  A high-frequency heating device according to the present invention includes a main body having a heating chamber having an opening formed on the front surface, and a choke structure formed of a metal plate attached to the main body so as to freely open and close the opening. A high-frequency heating device provided with a door, wherein a convex portion is formed on the inner wall of the outer peripheral portion of the door on the heating chamber side, and when the door is closed, the convex portion and the inner wall surface of the heating chamber A high-frequency propagation path for attenuating high-frequency waves is formed.

  A high-frequency heating device according to the present invention includes a main body having a heating chamber having an opening formed on the front surface, and a choke structure formed of a metal plate attached to the main body so as to freely open and close the opening. A high-frequency heating device provided with a door, wherein a convex portion is formed on the inner wall of the outer peripheral portion of the door on the heating chamber side, and when the door is closed, the convex portion and the inner wall surface of the heating chamber Since the high frequency propagation path for attenuating the high frequency is formed, the amount of high frequency leakage can be effectively suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing a main section of a high-frequency heating device 100 according to Embodiment 1 of the present invention. The high-frequency heating device 100 shown here represents a state in which the door 20 is closed. Based on FIG. 1, the structure of the high frequency heating apparatus 100 is demonstrated. The high-frequency heating device 100 includes a main body 10 and a door 20. The main body 10 includes a heating chamber 11 that accommodates an object to be heated such as food, a magnetron (not shown) that emits microwaves for cooking the object to be heated, and a magnetron for guiding the microwave into the heating chamber 11. A connected waveguide (not shown) is built in. An opening 12 is formed on the front surface of the heating chamber 11.

  The door 20 is attached to the main body 10 and covers the opening 12 formed in the main body 10 (heating chamber 11) so as to be freely opened and closed. The door 20 may be attached to the main body 10 via a hinge, or may be attached to the main body as a sliding type like a sliding door. When the high-frequency heating device 100 is a built-in type, it may be attached to the main body 10 in such a manner that the door 20 is pulled out. Furthermore, when attaching via a hinge, you may attach in any direction of the main body 10.

  The door 20 includes a metal plate 24, an inner glass 26 and an outer glass 27 that sandwich the metal plate 24 in the front-rear direction, and a choke cover 22 that covers an outer peripheral portion 29 of the metal plate 24. A plurality of through holes are formed at positions facing the opening 12 of the metal plate 24 so that the inside of the heating chamber 11 can be seen. A choke structure 21 is formed inside the outer peripheral portion 29 of the door 20. Here, the case where the choke structure 21 is formed by bending a plurality of metal plates 24 is shown as an example. The choke structure 21 may have a comb shape in which a plurality of slits are formed at a predetermined interval. Further, when the choke structure 21 has a comb shape, the number of slits is not particularly limited. Furthermore, the metal plate 24 is not particularly limited as long as it can form the choke structure 21 and the convex portion 30.

  The metal plate 24 is formed with a convex portion 30 having a shape protruding toward the heating chamber 11 between the outer peripheral portion 29 and the inner glass 26. The convex portion 30 and the inner wall surface of the heating chamber 11 form a high-frequency propagation path 50 that is a path for attenuating microwaves. That is, the convex portion 30 plays a role for extending a microwave path that tends to leak toward the gap between the door 20 and the front surface of the heating chamber 11. The metal plate 24 is not particularly limited as long as it can form the choke structure 21 and the convex portion 30.

  That is, the high-frequency propagation path 50 has a predetermined length, and sufficiently attenuates microwaves that are about to leak from the gap between the door 20 and the main body 10 before entering the inside of the choke structure 21. It is for keeping. By doing so, the amount of microwave leakage can be suppressed not only in the choke structure 21 but also in the high-frequency propagation path 50, so that the amount of microwave leakage can be suppressed more efficiently. In addition, the convex part 30 should just be a shape which can extend the high frequency propagation path | route 50, and does not specifically limit a shape. 1 shows a case where the convex portion 30 is not in contact with the wall constituting the heating chamber 11, but the convex portion 30 may be in contact with the wall constituting the heating chamber 11.

  The inner glass 26 plays a role of constituting one surface of the heating chamber 11 with the door 20 closed. The inner glass 26 makes the heating chamber 11 visible when the door 20 is closed. The outer glass 27 plays a role of constituting the outer surface of the door 20. The outer glass 27 also makes the heating chamber 11 visible when the door 20 is closed, like the inner glass 26. In addition, although the material of the inner side glass 26 and the outer side glass 27 is not specifically limited, For example, it is good to comprise it with a material with high heat resistance and good transparency.

  The choke structure 21 is covered with a choke cover 22 so that dust, dust and the like do not enter the choke structure 21. The choke cover 22 corresponds to the shape of the choke structure 21 and may have a shape that closes the gap between the door 20 and the main body 10. The choke cover 22 may be formed of a material having a small dielectric loss coefficient that absorbs microwaves so that the influence on the performance of the choke structure 21 is reduced. For example, the choke cover 22 may be formed of a resin such as polypropylene, PET (polyethylene terephthalate), or PBT (polybutylene terephthalate).

Here, the features of the choke structure 21 will be described.
The choke structure 21 is configured by forming a chalk box body 23 in which a plurality of outer peripheral portions 29 of the metal plate 24 are bent and bent into a bag path shape. By introducing the microwave into the choke box body 23, the leakage amount of the microwave leaking from the gap between the door 20 and the main body 10 is suppressed. That is, the microwave that is about to leak from the gap between the door 20 and the main body 10 is guided into the choke box body 23 of the choke structure 21 and reflected by the end (a) of the choke box body 23. Microwave leakage is suppressed by combining the microwave guided into the choke box body 23 and maximizing the microwave voltage at the entrance (b) of the choke structure 21 and minimizing the current. To do.

  By doing so, the apparent impedance of the microwave at the entrance portion (b) of the choke structure 21 can be made infinite (∞), and microwave leakage from the gap between the door 20 and the main body 10 can be achieved. It is possible to eliminate or reduce the amount. Therefore, the choke structure 21 includes the distance from the entrance portion (c) of the gap between the door 20 and the main body 10 to the entrance portion (b) of the choke structure 21 and the choke structure 21 to the choke box. The distance to the end (a) of the body 23 is set to be about 1/4 of the wavelength of the microwave. This is because the reflected wave from the choke box 23 and the microwave to be leaked are in opposite phases and synthesized at the entrance portion (b) of the choke structure 21.

Next, the characteristic part of the high frequency heating apparatus 100 according to Embodiment 1 will be described.
In the high-frequency heating device 100, the convex portion 30 is formed on the inner wall of the outer peripheral portion 29 of the door 20 so as to form the high-frequency propagation path 50 in a state where the door 20 is closed. That is, by forming the protrusion 30 on the door 20, the high-frequency propagation path 50 is formed, and the microwave is attenuated before entering the choke structure 21 formed on the outer peripheral portion 29 of the door 20. It is. Therefore, even if the choke structure 21 cannot sufficiently suppress leakage of the microwave, the microwave can be sufficiently attenuated in the previous stage.

  Forming such a convex portion 30 on the door 20 is effective, for example, when the ability of the choke structure 21 to suppress microwaves is low or when it is desired to particularly suppress the amount of leakage from a predetermined portion of the door 20. That is, the convex part 30 may be formed in the whole door 20 according to the performance and use of the high frequency heating apparatus 100, and may be formed only in part. Therefore, the safety can be further improved as compared with the choke structure 21 that suppresses the amount of microwave leakage. Further, if the convex portion 30 is formed, the performance of the choke structure 21 need not be emphasized.

  In other words, the choke structure 21 is formed by bending the metal plate 24 a plurality of times. However, the adjustment of dimensions and angles is complicated and requires a lot of labor for manufacturing, but the convex portion 30 is more complicated than the choke structure 21. By forming the convex part 30 on the door 20 without having a shape, it is possible to reduce the labor required for manufacturing the choke structure 21. Further, as shown in the first embodiment, by combining the choke structure 21 and the convex portion 30, the leakage amount of the microwave can be sufficiently suppressed.

  In the first embodiment, the number of times the metal plate 24 forming the choke structure 21 is bent, the material of the metal plate 24, and the shape and size of the choke structure 21 itself are not particularly limited. In other words, the choke structure 21 may be anything as long as it can suppress the amount of microwave leakage using the principle of the choke structure described above. The frequency of the irradiated microwave, the size of the high-frequency heating device 100, and the installation location The number of bending of the metal plate 24, the material of the metal plate 24, and the shape of the choke structure 21 itself may be determined in consideration of the above. In the first embodiment, the case where the choke structure 21 is formed by bending a plurality of metal plates 24 is described as an example, but the present invention is not limited to this. For example, the choke structure 21 may be formed by bending the metal plate 24 so as to form a curved surface.

Embodiment 2. FIG.
FIG. 2 is a longitudinal sectional view showing a main section of the high-frequency heating device 100a according to Embodiment 2 of the present invention. The high-frequency heating device 100a shown here represents a state in which the door 20a is closed. Based on FIG. 2, the structure of the high frequency heating apparatus 100a is demonstrated. In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The high-frequency heating device 100a includes a main body 10 and a door 20a. The door 20a is attached to the main body 10 and covers the opening 12 formed in the main body 10 (heating chamber 11) so as to be freely opened and closed. A choke structure 21a is formed inside the outer peripheral portion 29a of the door 20a. Here, a case where the choke structure 21a is formed by bending a plurality of metal plates 24a is shown as an example. The choke structure 21a may have a comb-tooth shape in which a plurality of slits are formed at a predetermined interval. Further, when the choke structure 21a has a comb shape, the number of slits is not particularly limited.

  A propagation path extending sheet metal 31, which is an example of a convex portion protruding toward the heating chamber 11 between the outer peripheral portion 29 a and the inner glass 26, is attached to the metal plate 24 a. The propagation path extending sheet metal 31 and the inner wall surface of the heating chamber 11 form a high-frequency propagation path 50a that is a path for attenuating microwaves. In other words, the propagation path extending sheet metal 31 plays a role for extending a microwave path that tends to leak toward the gap between the door 20a and the front surface of the heating chamber 11. The material of the metal plate that forms the propagation path extending sheet metal 31 is not particularly limited.

  The propagation path extending sheet metal 31 serves the same function as the convex part 30 described in the first embodiment, but is not formed by processing the metal plate 24 like the convex part 30. 24a is attached. The propagation path extension sheet metal 31 is not particularly limited as long as it has a shape capable of forming the high frequency propagation path 50a. 2 shows the case where the propagation path extending sheet metal 31 is not in contact with the wall constituting the heating chamber 11, the propagation path extending sheet metal 31 may be in contact with the wall constituting the heating chamber 11 ( (See FIG. 3).

Next, the characteristic part of the high-frequency heating device 100a according to Embodiment 2 will be described.
In the high-frequency heating device 100a, the propagation path extending sheet metal 31 is attached to the inner wall of the outer peripheral portion 29a of the door 20a so as to form the high-frequency propagation path 50a when the door 20a is closed. That is, by attaching the propagation path extension sheet metal 31 to the door 20a, the high frequency propagation path 50a is formed, and the microwave is attenuated before entering the choke structure 21a formed in the outer peripheral portion 29a of the door 20a. It is intended. Therefore, even when the choke structure 21a cannot sufficiently suppress leakage of the microwave, the microwave can be sufficiently attenuated in the previous stage.

  When such a propagation path extending sheet metal 31 is attached to the door 20a, it is effective, for example, when the ability of the choke structure 21a to suppress microwaves is low or when it is desired to particularly suppress the amount of leakage from a predetermined portion of the door 20a. That is, the propagation path extending sheet metal 31 may be formed on the entire door 20a or may be formed only on a part according to the performance and application of the high-frequency heating device 100a. Therefore, the safety can be further improved as compared with the choke structure alone that suppresses the amount of microwave leakage. Further, if the propagation path extending sheet metal 31 is formed, the performance of the choke structure 21a need not be emphasized.

  In other words, the choke structure 21a is formed by bending a plurality of metal plates 24a. However, the adjustment of the size and angle is complicated and much labor is required to manufacture, but the propagation path extension sheet metal 31 is as large as the choke structure 21a. It does not have a complicated shape, and by attaching the propagation path extending sheet metal 31, it is possible to reduce the effort required to manufacture the choke structure 21a. Further, as shown in the second embodiment, the amount of microwave leakage can be sufficiently suppressed by combining the choke structure 21a and the propagation path extending sheet metal 31. Further, the propagation path extending sheet metal 31 can be attached more easily than forming the convex part 30 shown in the first embodiment.

  In the second embodiment, the number of bending of the metal plate 24a forming the choke structure 21a, the material of the metal plate 24a, and the shape and size of the choke structure 21a itself are not particularly limited. In other words, the choke structure 21a may be anything as long as the amount of microwave leakage can be suppressed by using the principle of the choke structure described above. The frequency of the irradiated microwave, the size of the high-frequency heating device 100a, and the installation location The number of bending of the metal plate 24a, the material of the metal plate 24a, and the shape of the choke structure 21a itself may be determined in consideration of the above.

  In the second embodiment, the case where the choke structure 21a is formed by bending a plurality of metal plates 24a is described as an example, but the present invention is not limited to this. For example, the choke structure 21a may be formed by bending the metal plate 24a so as to form a curved surface. The propagation path extending sheet metal 31 is not particularly limited as long as it is attached to the inner wall of the outer peripheral portion 29a of the door 20a.

Embodiment 3 FIG.
FIG. 3 is a longitudinal sectional view showing a main section of a high-frequency heating device 100b according to Embodiment 3 of the present invention. The high-frequency heating device 100b shown here represents a state in which the door 20b is closed. Based on FIG. 3, the structure of the high frequency heating apparatus 100b is demonstrated. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  The high-frequency heating device 100b includes a main body 10 and a door 20b. The door 20b is attached to the main body 10, and covers the opening 12 formed in the main body 10 (heating chamber 11) so as to be freely opened and closed. A choke structure 21b is formed inside the outer peripheral portion 29b of the metal plate 24b. Here, a case where the choke structure 21b is formed by bending a plurality of metal plates 24b is shown as an example. The choke structure 21b may have a comb shape in which a plurality of slits are formed at a predetermined interval. In addition, when the choke structure 21b has a comb shape, the number of slits is not particularly limited.

  A propagation path extending sheet metal 32 that is an example of a convex portion protruding toward the heating chamber 11 between the outer peripheral portion 29b and the inner glass 26 is attached to the metal plate 24b. The propagation path extending sheet metal 32 and the inner wall surface of the heating chamber 11 form a high-frequency propagation path 50b that is a path for attenuating microwaves. In other words, the propagation path extending sheet metal 32 serves to extend the microwave path that tends to leak toward the gap between the door 20 b and the front surface of the heating chamber 11. The material of the metal plate forming the propagation path extending sheet metal 32 is not particularly limited.

  The propagation path extending sheet metal 32 serves the same function as the convex portion 30 described in the first embodiment, but is not formed by processing the metal plate 24 like the convex portion 30. 24b is attached. Note that the propagation path extending sheet metal 32 is not particularly limited as long as it has a shape capable of forming the high-frequency propagation path 50b. Further, the propagation path extending sheet metal 32 is in contact with the inner wall surface constituting the heating chamber 11 as shown in FIG.

Next, the characteristic part of the high frequency heating apparatus 100b according to Embodiment 3 will be described.
In the high-frequency heating device 100b, the propagation path extending sheet metal 32 is attached to the inner wall of the outer peripheral portion 29b of the door 20b so as to form the high-frequency propagation path 50b when the door 20b is closed. That is, by attaching the propagation path extension sheet metal 32 to the door 20b, the high frequency propagation path 50b is formed, and the microwave is attenuated before entering the choke structure 21b formed in the outer peripheral portion 29b of the door 20b. It is intended. Therefore, even when the choke structure 21b cannot sufficiently suppress the leakage of the microwave, the microwave can be sufficiently attenuated in the previous stage.

  The propagation path extension sheet metal 32 serves the same function as the propagation path extension sheet metal 31 described in the second embodiment. The propagation path extension sheet metal 31 described in the second embodiment is configured not to contact the inner wall surface of the heating chamber 11, but the propagation path extension sheet metal 32 has a contact portion (see FIG. 4). The heating chamber 11 comes into contact with the inner wall surface. Like the propagation path extending sheet metal 31 of the second embodiment, the high frequency propagation path 50a can be extended without being in contact with the wall of the heating chamber 11, so that the amount of microwave leakage can be suppressed. The amount of microwave leakage can be further suppressed by contacting the wall of the heating chamber 11 like the sheet metal 32.

  When the propagation path extending sheet metal 32 is brought into contact with the inner wall surface of the heating chamber 11, the microwave path to be propagated to the outside of the heating chamber 11 can be narrowed by the high-frequency propagation path 50 b, and the microwave is brought into the heating chamber 11. This is because it can be kept. That is, even if it contacts with the inner wall surface of the heating chamber 11 like the propagation path extension sheet metal 32, a slight gap is formed. Therefore, by attaching the propagation path extension sheet metal 32, the high-frequency propagation path 50b is formed and the micro path is formed. It is designed to extend the wave path.

  When such a propagation path extending sheet metal 32 is attached to the door 20b, it is effective, for example, when the ability of the choke structure 21b to suppress microwaves is low, or when it is desired to particularly suppress the amount of leakage from a predetermined portion of the door 20b. That is, the propagation path extending sheet metal 32 may be formed on the entire door 20b or may be formed only on a part thereof depending on the performance and application of the high-frequency heating device 100b. Therefore, the safety can be further improved as compared with the case where the propagation path extending sheet metal 31 is formed.

  FIG. 4 is a perspective view showing an example of the shape of the propagation path extending sheet metal 32. A characteristic portion of the propagation path extending sheet metal 32 will be described with reference to FIG. Since the propagation path extension sheet metal 32 comes into contact with the wall of the heating chamber 11, the propagation path extension sheet metal 32 may be formed of a material that reduces loss generated in both the heating chamber 11 and the propagation path extension sheet metal 32 due to the contact. desirable. That is, the material of the propagation path extending sheet metal 32 is not particularly limited, but a metal having high elasticity may be formed as a material. The propagation path extension sheet metal 32 is bent at a right angle to form a parallel surface 41 with the metal plate 24b and a parallel surface 42 with the wall of the heating chamber 11, and the parallel surface 42 is bent at a predetermined angle. Thus, a contact surface (contact portion) 43 with the wall of the heating chamber 11 is formed and manufactured.

  In addition, slits 40 are formed in the propagation path extension sheet metal 32 at a predetermined interval. The slit 40 is formed for the same purpose as the slit formed in the choke structure 21b. That is, it is formed to attenuate the microwave propagating along the outer peripheral portion 29. Further, the propagation path extending sheet metal 32 is provided with an angle in the middle of a plane parallel to the wall of the heating chamber 11 in order to make contact with the wall of the heating chamber 11. The number of slits 40 formed in the propagation path extending sheet metal 32 and the angle provided in the middle of the surface parallel to the wall of the heating chamber 11 are not particularly limited.

  In the third embodiment, the number of bending of the metal plate 24b forming the choke structure 21b, the material of the metal plate 24b, and the shape and size of the choke structure 21b itself are not particularly limited. That is, the choke structure 21b may be anything that can suppress the amount of microwave leakage using the principle of the choke structure described above. The frequency of the irradiated microwave, the size of the high-frequency heating device 100b, and the installation location The number of bending of the metal plate 24b, the material of the metal plate 24b, and the shape of the choke structure 21b itself may be determined in consideration of the above.

  In the third embodiment, the case where the choke structure 21b is formed by bending a plurality of metal plates 24b is described as an example. However, the present invention is not limited to this. For example, the choke structure 21b may be formed by bending the metal plate 24b so as to form a curved surface. The propagation path extending sheet metal 32 is not particularly limited as long as it is attached to the inner wall of the outer peripheral portion 29b of the door 20b.

  Further, the propagation path extending sheet metal 32 has been described as an example in which the parallel surface 42 is bent at a predetermined angle to form the contact surface 43 and contact the wall of the heating chamber 11, but the present invention is not limited thereto. Absent. For example, the material for manufacturing the propagation path extending sheet metal 32 is not bent at a right angle, but only the parallel surface 41 with the metal plate 24 b and the contact surface 43 with the wall of the heating chamber 11 are formed, and the wall of the heating chamber 11 is formed. You may make it contact. 4 may be formed in the propagation path extending sheet metal 32 of the second embodiment.

Embodiment 4 FIG.
FIG. 5 is a longitudinal sectional view showing a main section of a high-frequency heating device 100c according to Embodiment 4 of the present invention. The high-frequency heating device 100c shown here represents a state in which the door 20c is closed. Based on FIG. 5, the structure of the high frequency heating apparatus 100c is demonstrated. In the fourth embodiment, differences from the first to third embodiments will be mainly described, and the same parts as those in the first to third embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  The high-frequency heating device 100c includes a main body 10 and a door 20c. The door 20c is attached to the main body 10, and covers the opening 12 formed in the main body 10 (heating chamber 11) so as to be freely opened and closed. A choke structure 21c is formed on the outer peripheral portion 29b of the metal plate 24c. Here, a case where the choke structure 21c is formed by bending a plurality of metal plates 24c is shown as an example. Note that the choke structure 21c may have a comb shape in which a plurality of slits are formed at predetermined intervals. In addition, when the choke structure 21b has a comb shape, the number of slits is not particularly limited.

  A propagation path extending sheet metal 33, which is an example of a convex portion protruding toward the heating chamber 11 between the outer peripheral portion 29c and the inner glass 26, is attached to the metal plate 24c. The propagation path extending sheet metal 33 and the inner wall surface of the heating chamber 11 form a high-frequency propagation path 50c that is a path for attenuating microwaves. In other words, the propagation path extending sheet metal 33 serves to extend the microwave path that tends to leak toward the gap between the door 20 c and the front surface of the heating chamber 11. The material of the metal plate that forms the propagation path extending sheet metal 33 is not particularly limited.

  The propagation path extending sheet metal 33 serves the same function as the convex portion 30 described in the first embodiment, but is not formed by processing the metal plate 24 like the convex portion 30. 24c is attached. The propagation path extending sheet metal 33 is not particularly limited as long as it has a shape that can extend the high-frequency propagation path 50c. Further, the propagation path extending sheet metal 33 is in contact with the inner wall surface constituting the heating chamber 11 as shown in FIG.

Next, the characteristic part of the high-frequency heating device 100c according to Embodiment 4 will be described.
In the high-frequency heating device 100c, the propagation path extending sheet metal 33 is attached to the inner wall of the outer peripheral portion 29c of the door 20c so as to form the high-frequency propagation path 50c when the door 20c is closed. That is, by attaching the propagation path extension sheet metal 33 to the door 20c, the high frequency propagation path 50c is formed, and the microwave is attenuated before entering the choke structure 21c formed inside the outer peripheral portion 29c of the door 20c. It is intended. Therefore, even when the choke structure 21c cannot sufficiently suppress the leakage of the microwave, the microwave can be sufficiently attenuated in the previous stage.

  The propagation path extension sheet metal 33 plays the same role as the propagation path extension sheet metal 31 described in the second embodiment. The propagation path extending sheet metal 31 described in the second embodiment is configured not to contact the inner wall surface of the heating chamber 11, but the propagation path extending sheet metal 33 is formed with a contact portion. It comes in contact with the inner wall surface. Like the propagation path extending sheet metal 31 of the second embodiment, the high frequency propagation path 50a can be extended without being in contact with the wall of the heating chamber 11, so that the amount of microwave leakage can be suppressed. The amount of microwave leakage can be further suppressed by contacting the wall of the heating chamber 11 like the sheet metal 33.

  Further, the propagation path extending sheet metal 33 is configured to be accommodated inside the outer peripheral portion 29c of the door 20c. And the propagation path | route extension sheet metal 33 protrudes in the heating chamber 11 side in the state which the door 20c was closed, as shown in FIG. The door 20c incorporates a tact switch 60, a motor 61, and a wiring 62. Further, a switch convex portion 65 is provided at a position facing the tact switch 60 of the opening 12. That is, when the door 20c is closed, the tact switch 60 is pushed by the switch convex portion 65 provided in the opening 12.

  When the tact switch 60 is pushed by the switch convex portion 65, the information is transmitted to a control board (not shown) connected to the tact switch 60 via the wiring 62. The control board recognizes that the door 20c is closed and operates the motor 61. When the motor 61 is operated, the propagation path extending sheet metal 33 connected to the motor 61 protrudes into the heating chamber 11. When the tact switch 60 is separated from the switch convex portion 65, the information is transmitted to the control board, the motor 61 is operated by recognizing that the door 20c has been opened, and the propagation path extending sheet metal 33 is moved into the door 20c. It is designed to be accommodated.

  As described above, the propagation path extending sheet metal 33 is projected to the heating chamber 11 side in conjunction with the closing of the door 20c. With such a configuration, when the door 20c is opened, the propagation path extending sheet metal 33, which is a convex portion, is hidden, and the surface of the door 20c on the heating chamber 11 side is flat. Will be improved. Here, the case where the propagation path extending sheet metal 33 is in contact with the wall of the heating chamber 11 has been described as an example. However, the present invention is not limited to this, and may not be contacted as described in the first embodiment. .

  The control board may be provided anywhere on the main body 10, but may be provided in an inconspicuous position such as in the vicinity of an operation panel unit (not shown) or around a door arm (not shown). Further, the slit 40 as shown in FIG. 4 may be formed in the propagation path extending sheet metal 33. The propagation path extending sheet metal 33 may be formed on the entire door 20c or may be formed only on a part thereof. Further, although the material of the propagation path extending sheet metal 33 is not particularly limited, it is preferable to form a highly elastic metal as a material.

  In the fourth embodiment, the number of bending of the metal plate 24c forming the choke structure 21c, the material of the metal plate 24c, and the shape and size of the choke structure 21c itself are not particularly limited. In other words, the choke structure 21c may be anything as long as it can suppress the amount of microwave leakage using the principle of the choke structure described above. The frequency of the irradiated microwave, the size of the high-frequency heating device 100c, and the installation location The number of bending of the metal plate 24c, the material of the metal plate 24c, and the shape of the choke structure 21c itself may be determined in consideration of the above.

  In the fourth embodiment, the case where the choke structure 21c is formed by bending a plurality of metal plates 24c is described as an example, but the present invention is not limited to this. For example, the choke structure 21c may be formed by bending the metal plate 24c so as to form a curved surface. The propagation path extending sheet metal 33 is not particularly limited as long as it can be accommodated in the outer peripheral portion 29b of the door 20c.

  In the fourth embodiment, the case where the tact switch 60, the motor 61, and the wiring 62 are built in the door 20c has been described as an example, but the present invention is not limited to this. For example, the configuration may be such that the propagation path extension sheet metal 33 is protruded through the seesaw structure when either the switch convex portion 65 or the propagation path extension sheet metal 33 is pushed. In this way, it is not necessary to provide the wiring 62 inside the door 20c, and the door 20c can be thinned. Further, the contents described in the first to fourth embodiments may be combined.

It is a longitudinal cross-sectional view which shows the main cross sections of the high frequency heating apparatus which concerns on Embodiment 1. FIG. It is a longitudinal cross-sectional view which shows the main cross sections of the high frequency heating apparatus which concerns on Embodiment 2. FIG. It is a longitudinal cross-sectional view which shows the main cross sections of the high frequency heating apparatus which concerns on Embodiment 3. It is a perspective view which shows an example of the shape of a propagation path | route extension sheet metal. It is a longitudinal cross-sectional view which shows the main cross sections of the high frequency heating apparatus which concerns on Embodiment 4.

Explanation of symbols

10 body, 11 heating chamber, 12 opening, 20 door, 20a door, 20b door, 20c door, 21 chalk structure, 21a chalk structure, 21b chalk structure, 21c chalk structure, 22 chalk cover, 24 metal plate, 24a metal plate 24b metal plate, 24c metal plate, 26 inner glass, 27 outer glass, 29 outer peripheral portion, 29a outer peripheral portion, 29b outer peripheral portion, 29c outer peripheral portion, 30 convex portion, 31 propagation path extending sheet metal, 32 propagation path extending sheet metal, 33 Propagation path extension sheet metal, 40 slit, 41 parallel surface, 42 parallel surface, 43 contact surface, 50 high frequency propagation path, 50a high frequency propagation path, 50b high frequency propagation path, 50c high frequency propagation path, 60 tact switch, 61 motor, 62 wiring, 65 switch convex part, 100 high frequency heating apparatus, 100a high frequency heating apparatus, 100b high Wave heating device, 100c high-frequency heating apparatus.

Claims (6)

A main body having a heating chamber in which an opening is formed on the front surface;
A high-frequency heating device including a door attached to the main body so as to freely open and close the opening and having a choke structure formed of a metal plate provided inside the outer periphery,
A convex portion is formed on the inner wall of the outer peripheral portion on the heating chamber side of the door,
With the door closed,
A high frequency propagation path for attenuating a high frequency is formed by the convex portion and the inner wall surface of the heating chamber. The convex portion,
It formed with the metal plate which comprises the said door. The high frequency heating apparatus of Claim 1 characterized by the above-mentioned. The convex portion,
The high-frequency heating device according to claim 1, wherein the high-frequency heating device is formed of a metal plate different from the metal plate constituting the door. The high-frequency heating device according to any one of claims 1 to 3, wherein the convex portion is brought into contact with an inner wall surface of the heating chamber. The high-frequency heating device according to claim 4, wherein a plurality of slits are formed in a contact portion between the convex portion and an inner wall surface of the heating chamber. The convex portion is configured to be accommodated in the door,
The high-frequency heating device according to claim 1, 3, 4, or 5, wherein the convex portion protrudes toward the heating chamber in conjunction with closing of the door.

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