JP7192248B2 - High frequency dielectric heating device - Google Patents

Description

The present invention has a housing, a high-frequency power supply, a high-voltage electrode housed in the housing, and a ground electrode housed in the housing, wherein the high-voltage electrode and the ground electrode are alternately arranged in the housing. The present invention relates to a high-frequency dielectric heating apparatus that is provided with a plurality of heating layers that are housed between high-voltage electrodes and ground electrodes, and that heats a material to be heated such as frozen food placed in the heating layers.

Conventionally, a high-frequency dielectric heating apparatus for heating a material to be heated between a high-voltage electrode and a ground electrode is well known. It is known that an electric circuit is connected to a ground electrode and a high-frequency voltage is applied to heat a material to be heated.
For example, a high-frequency dielectric heating device (thawing device) known in Patent Document 1 has a housing (container 2) with an internal volume that allows a carriage (60) to be put in and taken out, and the carriage (60) includes a plurality of high-voltage electrodes and It has an electrode group in which the ground electrodes are vertically stacked with a predetermined space therebetween via an insulating member.
A plurality of contact members (81) are penetrated from the outside of the housing (container 2) at the same height position as the high-voltage electrode (positive electrode 62) in the side wall inside the housing (container 2). ) is accommodated, the side edge of the high-voltage electrode (positive electrode 62) in the electrode group is slidably contacted.

In addition, a plurality of contact members (83) that are electrically connected to the inner wall surface of the housing (container 2) protrude from the side wall inside the housing (container 2) at the same height position as the ground electrode (negative electrode 63). It is configured to be in sliding contact with the side edge of the ground electrode (negative electrode 63) in the electrode group when the truck (60) is accommodated.
A carriage (60) on which a material to be heated is placed between a plurality of high-voltage electrodes and a ground electrode is housed in a housing, and a high-voltage electrode (positive electrode 62) is brought into contact with a high-frequency power supply installed outside the housing. A high-frequency voltage is sequentially applied between the contact member (81) and the ground electrode to heat and defrost the material to be heated.

Japanese Patent No. 4121258

A known high-frequency dielectric heating device (thawing device) has a structure in which a plurality of electric circuits from a high-frequency power supply to each high-voltage electrode pass through a housing, and the high-voltage electrode and the ground electrode are fixedly connected by an insulating member. there is In this way, when multiple power supply units are configured, the size of the high-frequency power supply exterior case for shielding the electric field is increased, and switching means such as relays and control units are installed as incidental equipment. is required, and there is a problem that the cost is high and labor is required for manufacturing and maintenance.
In addition, in order to change the distance between the high-voltage electrode and the ground electrode, it is necessary to dismantle the truck by changing the length of the insulating member that connects the high-voltage electrode and the ground electrode, and to change each power supply position. I couldn't do it. In particular, in order to change the position of the contact member that penetrates from the outside of the housing (container 2) and is in sliding contact with the side edge of the high-voltage electrode (positive electrode 62), it is necessary to provide a new through hole in the housing. It is practically impossible to change the electrode spacing for the purpose of adjusting the heating (thawing) efficiency according to the type and thickness of the material to be heated.

The present invention is intended to solve the above-mentioned problems, and it is possible to save the installation space and heat (thaw) the materials to be heated such as frozen foods at once by configuring the electrodes in multiple stages. To provide a high-frequency dielectric heating device capable of easily changing the electrode spacing, such as heating (thawing) efficiency adjustment according to the type and thickness of a material to be heated, and excellent in assembly, maintainability, and customization.

A high-frequency dielectric heating apparatus according to the present invention includes a housing, a high-frequency power source, a high-voltage electrode housed in the housing, and a ground electrode housed in the housing, wherein the high-voltage electrode and the ground electrode are alternately accommodated in the housing, a plurality of heating layers are provided between the high-voltage electrodes and the ground electrodes, and heat (thaw) the material to be heated placed in the heating layers. In the high-frequency dielectric heating device, each of the high-voltage electrodes is independently detachably supported in the housing, and a high-voltage circuit connected to the high-frequency power supply and extending in the direction in which the heating layers are arranged is provided in the housing. and the high voltage path is configured to contact each high voltage electrode at the support position of each high voltage electrode.

According to the high-frequency dielectric heating apparatus of claim 1, each high-voltage electrode is independently detachably supported in the housing, so cleaning is easy by removing the electrodes from the housing.
Furthermore, a high voltage circuit connected to the high frequency power supply and extending in the direction in which the heating layers are arranged is provided in the housing, and the high voltage circuit is configured to contact each high voltage electrode at the support position of each high voltage electrode. As a result, electric power can be supplied from the high-frequency power supply to each high-voltage electrode collectively from one power supply unit via the high-voltage circuit. It is possible to simplify the electric circuit configuration inside and outside the body, and even if one does not have special electrical knowledge, the configuration is excellent in assembly and maintenance. Furthermore, since the electrical connection between the high-voltage circuit and each high-voltage electrode is by contact, no wiring work is required when attaching or detaching the electrodes.

According to the structure of claim 2, the housing is provided with electrode supports corresponding to the respective electrodes that support the high-voltage electrode and the ground electrode from the sides, so that each electrode can be attached and detached. , the work load during cleaning and maintenance is reduced.
According to the structure of claim 3, the high-voltage circuit or the high-voltage electrode is provided with a high-voltage contact corresponding to the contact portion, so that when the high-voltage electrode is attached or detached, the high-voltage circuit and the high-voltage electrode are electrically connected. can be performed reliably.
According to the fourth aspect of the present invention, the housing includes an electrode support for supporting the high- voltage electrode and the ground electrode from the side, and an electrode support position adjusting means capable of adjusting the position of the electrode support in the direction of the heating layer. By providing it, the electrode interval can be easily adjusted according to the shape and thickness of the material to be heated.
According to the fifth aspect of the present invention, the high-voltage circuit has a high-voltage power supply contact that is exposed outside the housing and detachably contacts the high-frequency power supply. , the configuration is excellent in assembly and maintainability.

According to the sixth aspect of the present invention, the high-voltage circuit further includes a high-voltage intermediate circuit that keeps the difference in the length of the circuit from the power supply high-voltage contact to each of the high-voltage electrodes within a predetermined range. Characteristics can be made uniform, and high-frequency heating can be performed with optimum electric power in all regions.
According to the seventh aspect of the present invention, a plurality of high voltage paths are provided independently in the direction in which the heating layers are arranged, and adjacent high voltage paths are connected to each other by a conductive member at adjacent portions other than the power supply high voltage contacts. The presence of the high-voltage electrodes makes it possible to further uniformize the impedance characteristics of the respective high-voltage electrodes.
According to the configuration of claim 8, by using a semiconductor type high frequency power supply that is smaller and lighter than the vacuum tube type high frequency power supply, the high frequency dielectric heating device can be further improved in assembly and maintenance, and can be space-saving. can be provided.

According to the ninth aspect of the present invention, each high-voltage electrode and each ground electrode are made of metal materials having the same shape and material, so that both electrodes can be distinguished when the electrodes are attached or detached during use or maintenance. This eliminates the need and makes handling significantly easier.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing seen from the side of the high frequency dielectric heating apparatus which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing seen from the front of the high frequency dielectric heating apparatus which concerns on 1st Embodiment of this invention. Enlarged explanatory view of a high voltage contact and a high voltage circuit. FIG. 3 is an explanatory diagram of the arrangement of a high-voltage electrode and a ground electrode; Layout explanatory drawing of a high-voltage terminal and a high-frequency power supply. Sectional drawing seen from the front of the high frequency dielectric heating apparatus which concerns on 2nd Embodiment of this invention. Layout explanatory drawing of a high-voltage terminal, a ground terminal, and a high-frequency power supply. Sectional drawing seen from the side of the high frequency dielectric heating apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing seen from the front of the high frequency dielectric heating apparatus which concerns on 3rd Embodiment of this invention. FIG. 4 is an explanatory diagram of a high voltage contact and a high voltage circuit according to another embodiment; Explanatory drawing of the electric circuit of the experiment example of this invention, and a contact. The table|surface of the experimental result of the experimental example of this invention. The table|surface of the experiment result of 3rd Embodiment of this invention, and another embodiment.

A high-frequency dielectric heating apparatus 100 according to the first embodiment of the present invention includes, as shown in FIG. 121, a ground electrode 131, a high-voltage circuit 200, a high-voltage contact 201, a power feeding portion 202 (high-voltage terminal 123), an electrode support 203, and an electrode support position adjusting means 204. A plurality of heating layers 130 are provided between the high-voltage electrode 121 and the ground electrode 131 by being accommodated. In the electrode arrangement shown in FIG. 1, as an example, the high-voltage electrodes 121 and the ground electrodes 131 are alternately configured so that both ends thereof are ground electrodes. It is not necessary to be limited as shown below.

The high-voltage electrode 121 and the ground electrode 131 are independently supported by the electrode support 203 so as to be detachable from the side of the refrigerator housing. By removing the electrodes from the refrigerator housing, the interior of the housing can be washed with water. be. Waste water during washing can be drained to the outside through a drain 111 at the bottom of the housing originally provided in the housing 110 .
The electrode supports 203 are independently provided for each electrode and supported by electrode support position adjusting means 204 provided on the side surface of the housing and extending in the direction in which the heating layers are arranged. Thus, the electrode spacing can be adjusted by changing the electrode support position in the direction in which the heating layers are arranged.
The high-voltage circuit 200 has a high-voltage terminal 123 exposed to the outside of the housing and connected to the high-frequency power supply 140, and extends in the direction in which the heating layers are arranged in the housing. 121, and the power supply to each high-voltage electrode can be collectively performed from one power supply unit.

As shown in FIG. 2, the housing 110 includes, on the side and rear sides of the housing, convex electrode supports 213 made of metal members having convex shapes that detachably support the high-voltage electrode 121 and the ground electrode 131. . Further, on the back surface of the high-voltage electrode 121 and the ground electrode 131, recessed electrode supports 223 made of a metal member or an insulating member having a recessed shape are provided corresponding to the respective projected electrode supports 213. Each electrode can be easily attached and detached by fitting the recessed electrode support.
The housing 110 supports the convex electrode support 213 and is provided with electrode support position adjusting means 204 made of a metal member capable of changing the support position in the direction of the heating layer on the side and back sides of the housing, whereby the high-voltage electrode 121 and the electrode spacing of the ground electrode 131 can be easily changed.
The ground electrode 131 can be electrically connected to the housing 110 via the convex electrode support 213 made of a metal member and the electrode support position adjusting means 204 made of a metal member by using a metal member for the recessed electrode support 223 . , to allow earth polarity to work without special wiring work.
The high-voltage electrode 121 uses a recessed electrode support 223 as an insulating member, and is connected to a high-frequency power supply 140 on the rear side of the housing 110. The high-voltage electrode 121 is brought into contact with the vertically extending high-voltage circuit 200 which is insulated and supported with respect to the housing. , can operate high voltage polarity.

The high-voltage contact 201 has a spring pressing function as shown in FIG. A plurality of contact fixing screws 126 are provided on the high-voltage circuit 200 . This ensures electrical connection when the high-voltage electrode 121 is inserted from the front surface of the housing 110 .

As shown in FIG. 2, the electrode supporting position adjusting means 204 is provided with position changing grooves 205 capable of changing the positions of the convex electrode supports 213 in the heating layer direction at predetermined intervals. As shown, the high-voltage circuit 200 is provided with a plurality of screw holes 127 at the same intervals as the position-changing grooves 205 for changing the mounting positions of the high-voltage contact fixing screws 126 corresponding to the position change of the convex electrode support 213 . The contact position between the high voltage electrode 121 and the high voltage circuit 200 can be easily changed according to the position.
Note that the electrode support position adjusting means 204 in this embodiment uses the guide rails provided in advance on the housing 110 as they are, but they may be newly provided. In addition, in the present embodiment, non-ferrous metal materials such as stainless steel, aluminum, and brass having electrical conductivity, corrosion resistance, and mechanical strength are used for the metal members or metal screws used in the electrodes, electric circuits, electrode supports, and the like. If necessary, the material may be subjected to surface treatment such as tin plating or silver plating. As the insulating member, a resin material such as PE, bakelite, or nylon, or a ceramic material such as glass or pottery is used.

FIG. 4 shows the details of the electrode arrangement in this embodiment. In the example of FIG. 4A, the same number of high-voltage electrodes 121 and ground electrodes 131 are alternately arranged. The power P of the high frequency power supply 140 is equally distributed to each high voltage electrode and further distributed to each heating layer 130 with different power. The power supply to the uppermost heating layer is larger than that of the other heating layers, and it can be used as a rapid heating layer for the material to be heated. In the example of FIG. 4B, the high-voltage electrode 121 and the ground electrode 131 are alternately arranged so that both ends thereof serve as ground electrodes. The output P of the high-frequency power supply 140 is equally distributed to each high-voltage electrode, and the same output is distributed to each heating layer, so that the material to be heated can be heated (thawed) with equal efficiency for each heating layer.
In this way, the high-voltage electrode 121 and the ground electrode 131 are independently and detachably supported from the side surface of the refrigerator housing. It is possible to always use the equipment in the optimum state, such as adjusting the heating (thawing) efficiency according to the shape and thickness of the product.

FIG. 5 shows a cross section of the power feeding portion 202 . The high-voltage terminal 123 is connected to the high-voltage circuit 200 and exposed at a predetermined position on the back side of the housing 110 so that the high-voltage power supply terminal 141 of the high-frequency power supply 140 can be inserted therein. The high-voltage terminal 123 or the power supply high-voltage terminal 141 is provided in the housing 110 or the metal housing 142 of the high-frequency power supply 140 via the insulating member 114 indicated by diagonal lines in FIG.
In this embodiment, the high-frequency power source 140 is a compact and lightweight semiconductor type high-frequency power source, so that it can be cantilevered on the outer wall of the housing 110, and the miniaturization of the high-frequency dielectric heating device can be achieved. In addition, as shown in FIG. 1, the high-frequency power supply 140 can be attached to the rear side of the high-voltage circuit 200 through the housing 110, so that the high-voltage terminal 123 and the power supply high-voltage terminal 141 can be connected in the shortest distance. As a result, it is possible to simplify the electric field shielding measures for shielding the electric field leaking from the power supply unit to the outside of the housing, and the configuration of the electric circuits outside and inside the housing. Furthermore, by inserting (contacting) the power supply high-voltage terminal 141 into the high-voltage terminal 123, it is possible to easily attach and detach the power supply without wiring work. and excellent maintainability.

As shown in FIGS. 6 and 7, a high-frequency dielectric heating apparatus according to a second embodiment of the present invention includes a commercially available refrigerator housing 110 having a cooling mechanism 101 disposed at the top, and a semiconductor high-frequency power supply 140, high voltage electrode 121, ground electrode 131, high voltage circuit 200, high voltage contact 201, ground circuit 300, ground contact 302, power supply unit 202 (high voltage terminal 123, ground terminal 133, power high voltage terminal 141, power supply ground terminal 151), An electrode support 203 (a convex electrode support 213 made of a metal member and a concave electrode support 223 made of an insulating member) and an electrode support position adjusting means 204 are provided. They are arranged alternately so as to form electrodes, and are independently supported by electrode supports 203 so as to be detachable from the side of the refrigerator housing. The electrode support 203 is supported by an electrode support position adjusting means 204 provided on the side surface of the housing and extending in the direction in which the heating layers are arranged. By changing the electrode support position in the direction in which the heating layers are arranged, the electrode spacing can be adjusted. is.
The high-voltage circuit 200 and the ground circuit 300 have a high-voltage terminal 123 and a ground terminal 133 that are exposed outside the housing and electrically connected to the semiconductor high-frequency power supply 140, and extend in the direction in which the heating layers are arranged in the housing. It is in contact with a plurality of high voltage electrodes 121 and ground electrodes 131 via high voltage contacts 201 and ground contacts 302 .
The high-voltage terminal 123 and the ground terminal 133 are connected in an insulated state to the housing 110 via the hatched insulating member 114 in FIG. 114 to the metal housing 142 of the high frequency power supply 140 in an insulated state. Further, the power supply ground terminal 151 is grounded to the metal housing 142 of the high frequency power supply 140 .
The ground electrode 131 is insulated and supported by a recessed electrode support made of an insulating member, thereby reducing high-frequency noise leaking to the housing 110 . In this case, the metal housing 142 of the high-frequency power supply 140 is preferably made of a metal material with low electrical resistance, such as aluminum.

As shown in FIG. 8, the high-frequency dielectric heating apparatus according to the second embodiment of the present invention is a commercially available refrigerator housing 110 having a cooling mechanism 101 arranged at the top and having a vertically independent door. It is composed of a refrigerator compartment 501 in the upper part and a high-frequency thawing compartment 502 in the lower part of the door. In this way, by providing the refrigerating chamber 501 and the high-frequency thawing chamber 502 separately in the same housing, for example, it is possible to use the food as a normal refrigerator while thawing the foodstuffs, thereby improving usability while saving space. .
The high-frequency thawing chamber 502 has a high-voltage electrode 121 and a ground electrode 131 arranged alternately so that both ends of the high-voltage electrode 121 and the ground electrode 131 serve as ground electrodes. Supported. By using ground electrodes at both ends, the power supply to each heating layer can be made uniform as described above. The electrode support 203 is supported by an electrode support position adjusting means 204 provided on the side surface of the housing and extending in the direction in which the heating layers are arranged. By changing the electrode support position in the direction in which the heating layers are arranged, the electrode spacing can be adjusted. is. The electrode support position adjusting means 204 is originally provided in the housing 110 and is configured to extend vertically between the refrigerator compartment 501 and the high-frequency thawing compartment 502 . Therefore, it is possible to use both the support of the heating electrode and the support of the general-purpose placing shelf 102 attached to the refrigerator, so that the structure can be made at a lower cost.
The power supply unit 202 is located behind the center pillar 112 that serves as a boundary between the refrigerating chamber 501 and the high-frequency thawing chamber 502, and is composed of the power supply high voltage terminal 141 and the power supply ground terminal 151 described above.
The high-voltage electrode 121 and the ground electrode 131 are made of a conductive metal material having the same shape and material, so that there is no need to distinguish between the two electrodes when attaching or detaching the electrodes during use or maintenance. significantly easier. Each electrode can be formed into the same shape at low cost and light weight by drawing an aluminum material or processing it with sheet metal.

In the high-frequency dielectric heating apparatus according to the third embodiment of the present invention, as shown in FIG. It has a high-voltage intermediate electric line 125 and an earth intermediate electric line 135 that keep the difference in electric line length to the ground contact 134 within a predetermined range.
Other configurations are the same as those of the second embodiment.
The high-voltage intermediate electric circuit 125 and the earth intermediate electric circuit 135 have a so-called tournament shape, and when the number of the high-voltage contacts 124 and the earth contacts 134 is large, they may be arranged in multiple stages.

In the above-described embodiment, the ground electrode 131 is insulated from the housing 110 and connected to the high-frequency power supply 140 through the ground electric circuit 132, the intermediate ground electric circuit 135, and the ground terminal 133, which extend in the vertical direction like the high-voltage electrode 121. Although they are connected, as in the second embodiment described above, only the straight ground cable 300 without the intermediate ground cable 135 may be used. The ground electrode 131 may be connected to the high frequency power supply 140 via the housing 110 or the electrode support.
Further, as shown in FIG. 10, from the high voltage terminal 123 and the ground terminal 133, the high voltage circuit 122A and the ground circuit 132A are provided independently from the installation side, and the high voltage circuit 122B and the ground are independently provided on the lower side. By connecting the electrical path 132B with the conductive members 128, 138 at adjacent positions other than the high-voltage terminal 123 and the ground terminal 133, power supply to each heating layer becomes more uniform.
The conductive members 128 and 138 may be inexpensive materials such as commercially available aluminum tapes.

Experimental example

An experimental example of the present invention will be described with reference to FIGS. 11 and 12. FIG.
The electric circuit configuration of FIG. 11A is composed of a high voltage circuit 200 connected to a high voltage terminal 123 and extending straight upward, and an earth electric circuit 300 connected to an earth terminal 133 and extending straight upward.
11(b) has a high-voltage circuit 122 having a tournament-shaped high-voltage intermediate circuit 125 connected to a high-voltage terminal 123, and a ground circuit having a tournament-shaped ground intermediate circuit 135 connected to a ground terminal 133. 132.
In each circuit configuration of FIGS. 11(a) and 11(b), frozen Brazilian chicken thigh meat (1 bag = 2 kg) at -20 ° C. is placed between the electrodes as a food material, and the atmosphere is set at 2 ° C. and the output is 500 w. FIG. 12 shows the high-voltage electrode voltage, thawing time, and food temperature when high-frequency thawing was performed.
The high-voltage electrode voltage in the electric circuit configuration (straight type) shown in FIG. rice field. As a result, the food temperature after thawing varied greatly depending on the placement position of the food, and the food placed near the high-voltage terminal 123 took longer to thaw.
On the other hand, in the electric circuit configuration (tournament type) shown in FIG. 11(b), the high-voltage electrode voltage was substantially the same regardless of the electrode position, and the food temperature after thawing was substantially the same regardless of the food mounting position. Thus, when thawing a plurality of foodstuffs collectively for a short period of time, it can be seen that an electric circuit configured by a high-voltage electric circuit having a tournament-shaped high-voltage intermediate electric circuit as shown in FIG. 11(b) is effective. .

Next, as an experimental example in each electric circuit configuration of FIG. 9 showing the third embodiment of the present invention and FIG. 10 showing another embodiment, frozen Brazilian chicken thighs (1 bag = 2 kg) at -20 ° C. FIG. 13 shows the high-voltage electrode voltage, thawing time, and food temperature when high-frequency thawing is performed with an atmosphere setting of 2 ° C. and an output of 500 W (however, FIG. 13 (a) shows the thawing test results in the electric circuit configuration of FIG. 9 , and FIG. 13(b) shows the thawing test results in the electric circuit configuration of FIG. 10).
Each electric circuit shown in FIGS. 9 and 10 includes a high-voltage intermediate circuit 125 and a ground intermediate circuit 135 each having a tournament shape above and below the high-voltage terminal 123 and the ground terminal 133, respectively. Further, in the electric circuit shown in FIG. 10, adjacent high voltage electric circuits 122A and 122B and ground electric circuits 132A and 132B are connected to each other by conductive members 128 and 138, respectively.
In the electric circuit configuration shown in FIG. 9, as shown in FIG. , the voltages generated at the upper and lower electrodes are almost equal. However, when the amount of food material is placed more on the upper electrode and less on the lower electrode, the voltage on the lower electrode is lower than that on the upper electrode. The food placed on the lower electrode had a longer thawing time.
On the other hand, in the electric circuit configuration shown in FIG. 10, as shown in FIG. Uniform thawing was possible without being affected by weight, quantity, type, and arrangement.

DESCRIPTION OF SYMBOLS 100... High frequency dielectric heating apparatus 101... Cooling mechanism 102... General-purpose mounting shelf 110... Case 111... Drain 112... Center pillar 114... Insulating member 121... High voltage Electrode 122 High-voltage circuit 123 High-voltage terminal 124 High-voltage contact 125 High-voltage intermediate circuit 126 Contact fixing screw 127 Screw hole 128 Conductive member 130 Heating layer 131 Earth electrode 132 Earth electric circuit 133 Earth terminal 134 Earth contact 135 Intermediate earth electric circuit 138 Conductive member 140 High frequency power supply 141 Power supply high voltage terminal 142... Metal casing 151... Power supply ground terminal 200... High voltage circuit 201... High voltage contact 202... Power supply unit 203... Electrode support 204... Electrode support position adjustment Means 205... Position changing groove 213... Convex electrode support 223... Concave electrode support 300... Earth electric circuit 302... Earth contact 501... Refrigerator compartment 502... High frequency thawing compartment

Claims (9)

a housing, a high-frequency power supply, a high-voltage electrode housed in the housing, and a ground electrode housed in the housing, wherein the high-voltage electrode and the ground electrode are housed alternately in the housing; A high-frequency dielectric heating device is provided with a plurality of heating layers configured between each high-voltage electrode and each ground electrode, and heats a material to be heated arranged in the heating layer,
each of the high-voltage electrodes and each of the ground electrodes is independently detachably supported in the housing;
A high-voltage path connected to the high-frequency power supply and extending in a direction in which the heating layers are arranged is provided in the housing,
A high-frequency dielectric heating apparatus, wherein the high-voltage circuit is configured to contact each high-voltage electrode at a support position of each high-voltage electrode. 2. The high-frequency dielectric heating apparatus according to claim 1, wherein the housing includes an electrode support that supports the high-voltage electrode and the ground electrode from side surfaces. 3. The high-frequency dielectric heating apparatus according to claim 1, wherein the high-voltage circuit or each of the high-voltage electrodes is provided with a high-voltage contact corresponding to the contact portion. 4. The housing comprises an electrode support for supporting the high-voltage electrode and the ground electrode from the sides thereof, and an electrode support position adjusting means capable of adjusting the position of the electrode support in the direction of the heating layer. The high-frequency dielectric heating device according to any one of claims 1 to 3. 5. A high-frequency dielectric heating apparatus according to claim 1, wherein said high-voltage circuit is provided with a power supply high-voltage contact that is exposed outside said housing and detachably contacts said high-frequency power supply. 6. A high-frequency dielectric heating apparatus according to claim 5, wherein said high-voltage circuit further comprises a high-voltage intermediate circuit for keeping a difference in circuit length from said power supply high-voltage contact to each of said high-voltage electrodes within a predetermined range. A plurality of the high-voltage paths are independently provided in the direction in which the heating layers are arranged,
7. A high-frequency dielectric heating apparatus according to claim 6, wherein the adjacent high-voltage paths are connected to each other by a conductive member at adjacent portions other than the power supply high-voltage contacts. 8. A high-frequency dielectric heating apparatus according to claim 1, wherein said high-frequency power source is a semiconductor type high-frequency power source. 9. The high-frequency dielectric heating apparatus according to claim 1, wherein each of said high-voltage electrodes and said each of said ground electrodes is made of metal having the same shape and material.

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