JP2011103183A - High-frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a choke structure of a high-frequency heating device easy to manufacture while securing high-frequency shielding performance through prevention of progress of high frequencies propagated along a door choke groove in a simple structure. <P>SOLUTION: In the high-frequency heating device including a heating chamber 1 with an opening 3 for housing a heated object 10 inside, a door 4 covering the opening 3 in free opening and closing, an opening peripheral edge portion 5 prepared around the opening 3 in opposition to the door 4, and a high-frequency supply unit 2 supplying high frequencies into the heating chamber 1, the door 4 has a choke structure opposed to the opening peripheral edge portion 5 at a closed state of the door 4, and the choke structure is of a structure having choke elements 9 divided by slits 6 and with a bag-like cross section, the choke elements 9 being periodically arranged in a comblike form, and being prepared in opposition to a periodic structure direction at parts where the periodic makeup of the choke structure gets discontinuous. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-frequency heating apparatus that uses a choke structure to shield a high frequency that is about to leak from between a heating chamber and a door.

  In this type of conventional high-frequency heating device, a choke groove that realizes the impedance reversal method is installed in the door, and the choke structure has a periodic comb-teeth shape with slits, so that the period is different for each installation side. There are some (see, for example, Patent Document 1). And the high frequency which is going to leak to the outside of the door through the gap between the heating chamber of the microwave and the door is attenuated by the choke structure and this periodic structure, but the interval of the periodic structure should be adjusted for each installation side. In order to increase the damping effect.

  There is one provided with a connecting piece that electrically connects two sided periodic structures facing a door corner (for example, see Patent Document 2). The periodic structure can be installed closer to the corner of the door to increase the damping effect.

  There are some which have different lengths near the door corners of the overhanging surface which extends from the door end and constitutes the choke, facing the flange around the opening of the heating chamber (for example, see Patent Document 3). Since the opening width of the choke structure is wide in the vicinity of the door corner, the resonance frequency is adjusted by partially extending the overhanging surface to maintain the damping effect.

JP 2007-317607 A Japanese Patent No. 2957833 Japanese Patent No. 3249240

  The above-mentioned periodic structure works on the principle of a slow wave circuit for high frequencies propagating along the door choke groove and prevents propagation. However, in the vicinity of the door corner, the periodic structure repeats from the door corner to the outside. In addition, since a sufficient effect cannot be expected, adjusting the interval of the periodic configuration for each installation side cannot secure the door corner attenuation effect even if the attenuation effect in the middle of each installation side can be enhanced.

  In the case of providing a connecting piece that electrically connects two periodic components facing the corner of the door, the choke structure can be moved to the door corner to widen the range in which the damping effect as a choke groove can be obtained. There is no effect on high frequencies propagating along the door choke groove, and the structure becomes complicated.

  If the length of the projecting surface that extends from the end of the door and has a different length near the corner of the door is corrected, the choke groove dimension is corrected at the door corner to ensure the damping effect as a choke groove. However, there is no effect on the high frequency propagating along the door choke groove.

  As described above, the conventional high-frequency heating apparatus has a problem that it is difficult to prevent high-frequency waves propagating along the door choke groove at the door corner, and the structure becomes complicated.

  The present invention solves the above-described conventional problems, and provides a high-frequency heating device that prevents high-frequency waves propagating along a door choke groove with a simple structure at a door corner, is easy to manufacture, and ensures high-frequency shielding performance. With the goal.

  In order to solve the above-described conventional problems, a high-frequency heating device according to the present invention includes a heating chamber that has an opening and accommodates an object to be heated, a door that covers the opening so as to be openable and closable, A high-frequency heating device comprising an opening peripheral portion provided around the door so as to face the door, and high-frequency supply means for supplying a high frequency into the heating chamber, wherein the door is open when the door is closed. The choke structure has a choke structure opposed to a peripheral edge, and the choke structure is a structure in which choke elements having a bag-like cross section separated by slits are periodically arranged in a comb shape, and the periodic structure of the choke structure is discontinuous. The choke element facing the arrangement direction of the periodic structure is provided in the part.

  Accordingly, it is possible to realize a high-frequency heating device that prevents high-frequency waves propagating along the door choke groove with a simple configuration at the door corner, is easy to manufacture, and ensures high-frequency shielding performance.

  The high-frequency heating device of the present invention can be configured to be simple and easy to manufacture while ensuring high-frequency shielding performance.

Perspective view of a general high-frequency heating device Sectional view of a typical high-frequency heating device The perspective view of the high frequency shielding part in the conventional high frequency heating apparatus Configuration diagram of a high-frequency shielding unit in an embodiment of the present invention The perspective view of the high frequency shielding part in an embodiment of the invention The top view of the high frequency shielding part in an embodiment of the invention

  A first invention includes a heating chamber having an opening and containing an object to be heated therein, a door that covers the opening so as to be openable and closable, and an opening peripheral portion provided around the opening so as to face the door A high-frequency heating device comprising a high-frequency supply means for supplying a high frequency into the heating chamber, wherein the door has a choke structure facing the opening peripheral edge when the door is closed, and the choke structure is partitioned by a slit. A choke element having a bag-like cross section is periodically arranged in a comb shape, and a choke element facing the arrangement direction of the periodic structure is provided in a portion where the periodic structure of the choke structure is discontinuous. By blocking the high-frequency wave propagating along the door choke groove by the choke structure, it is possible to realize a high-frequency heating device that is easy to manufacture with a simple configuration and ensures high-frequency shielding performance.

  In the second invention, in particular, one choke element is provided in the vicinity of the corner portion of the door where the periodic structure of the choke structure of the first invention is orthogonal, and one choke element faces the direction of the periodic structure of both choke structures. A high-frequency heating device that cuts off high-frequency waves propagating toward the door corner along the door choke grooves on the two sides with a single choke element, is easy to manufacture with a simple structure, and ensures high-frequency shielding performance. be able to.

In the third aspect of the invention, in particular, a plurality of choke elements are provided in the vicinity of the corner portion of the door where the periodic structure of the choke structure of the first invention is orthogonal, and the choke structure is opposed to the direction of the periodic structure of the choke structure. A high-frequency heating device that cuts off high-frequency waves propagating along the door choke groove toward the door corner with a combination of choke elements with a simple structure, ensuring high-frequency shielding performance. 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 and 2 are a perspective view and a sectional view of a general high-frequency heating device (microwave oven), respectively. FIG. 3 is a perspective view showing a high-frequency shielding part in a conventional high-frequency heating device.

  1 and 2, the object to be heated 10 opens the door 4 that can be opened and closed, is stored in the heating chamber 1 through the opening 3, is generated by the high-frequency supply means 2, and is supplied to the heating chamber 1. Heated by. The wall surface of the heating chamber 1 made of a metal material and the door 4 made of a metal material constitute a substantially rectangular parallelepiped structure that confines the supplied high frequency inside.

  However, there is a gap 7 between the opening peripheral portion 5 made of a metal material provided around the opening 3 and the door 4, and high frequency leaks from the gap 7 toward the outside of the door. A choke groove 8 is provided around the door 4 so as to be opposed to the opening peripheral edge portion 5, and the impedance is inverted at a distance of λ / 4 from the short-circuit end of the choke groove 8 to make the vicinity of the choke opening infinite impedance. The high frequency leaking from the gap 7 toward the outside of the door is blocked.

  In FIG. 3, the choke groove 8 of the door 4 is constituted by a periodic configuration by repeating the choke element 9 and the slit 6, and propagates along the choke groove 8 by optimally designing the dimensions of the choke element 9 and the slit 6. Prevent high-frequency progression.

  As described above, the high frequency leaking from the heating chamber 1 through the gap 7 toward the outside of the door blocks the component perpendicular to the choke groove 8 by the choke function, and the parallel component prevents the progression by the periodic structure. In addition, high frequency shielding performance is ensured.

  However, at the door corner, the periodic structure of two orthogonal sides terminates, and the effect of preventing the high-frequency progression due to the periodicity cannot be obtained.

  FIG. 4 is a configuration diagram of the high-frequency shielding unit in the embodiment of the present invention. High-frequency waves propagating along the choke groove 8 along the gap 7 between the peripheral edge 5 of the opening 4 and the door 4 are blocked by a periodic configuration formed by repetition of the choke element 9 and the slit 6, but leaked radio waves 12 near the door corner. In this case, no progress prevention effect can be obtained due to the periodic structure termination. The termination choke element 11 is installed facing the leaked radio wave 12 and blocks the leaked radio wave 12 by the action of the choke.

  FIG. 5 is a perspective view of the high-frequency shielding part in the embodiment of the present invention. The terminal choke element 11 is a door so as to act as a choke facing the arrangement direction of each of the two sides of the periodic structure formed by repetition of the choke element 9 and the slit 6 (that is, the direction in which the slit 6 is repeatedly provided). Install in the corner. A plurality of terminal choke elements 11 may be installed close to each other, and a combination thereof may serve as a choke.

  FIG. 6 is a plan view of the high frequency shielding portion in the embodiment of the present invention. A plurality of terminal choke elements 11 are installed close to each other, and a combination of them serves as a choke for the two sides.

  As described above, it is possible to realize a high-frequency heating device that blocks high-frequency waves propagating along the door choke groove at the door corner, is easy to manufacture with a simple configuration, and ensures high-frequency shielding performance.

  As described above, the high-frequency heating device according to the present invention has a configuration that is easy to manufacture, can ensure high-frequency shielding performance, and is used for a heating device or a garbage disposal machine that uses dielectric heating as typified by a microwave oven. It can also be applied to.

DESCRIPTION OF SYMBOLS 1 Heating chamber 2 High frequency supply means 3 Opening part 4 Door 5 Opening peripheral part 6 Slit 7 Gap 8 Choke groove 9 Choke element 10 To-be-heated object 11 Termination choke element 12 Leakage electric wave

Claims (3)

A heating chamber having an opening and containing an object to be heated therein, a door that covers the opening in an openable and closable manner, an opening peripheral portion provided around the opening and facing the door, and the heating A high-frequency heating apparatus including a high-frequency supply means for supplying high-frequency into a room, wherein the door has a choke structure facing the opening peripheral portion in a closed state of the door, and the choke structure is partitioned by a slit The choke elements having a bag-like cross-section are periodically arranged in a comb-like shape, and the choke elements facing the arrangement direction of the periodic structure are provided in portions where the periodic structure of the choke structure is discontinuous. High-frequency heating device. 2. The choke structure according to claim 1, wherein one choke element is provided in the vicinity of a corner portion of the door where the periodic structure of the choke structure is orthogonal, and the one choke element is opposed to the arrangement direction of both of the choke structures. High frequency heating device. A plurality of choke elements are provided in the vicinity of a corner portion of the door where the periodic structures of the choke structure are orthogonal to each other, and a choke element facing the arrangement direction of the periodic structures of the choke structure is configured by a combination of the plurality of choke elements. The high frequency heating apparatus according to claim 1.