JP2020161348A - Radio frequency heating apparatus - Google Patents

Abstract

To provide a radio frequency heating apparatus that is equipped with a surface wave transmission line, and stably performs sufficient heat treatment such as scorching the surface of an object to be heated having a round shape or a large height dimension.SOLUTION: A surface wave transmission line is configured in a tubular shape, and the high frequency power generated by a high frequency power generation unit is supplied to the surface wave transmission line via a high frequency power supply unit, and an object to be heated installed inside the tubular surface wave transmission line is heated. As a result, it is possible to stably perform sufficient heat treatment such as scorching the surface of the object to be heated having a round shape or a large height dimension.SELECTED DRAWING: Figure 1

Description

The present invention relates to a high frequency heating device provided with a surface wave transmission line using a periodic structure.

Conventionally, there has been disclosed a technique relating to a high frequency heating device that supplies high frequency power to a surface wave transmission line using a periodic structure to heat an object to be heated such as food.

For example, in Patent Document 1, high-frequency power is supplied from the end of a flat surface wave transmission line, and objects to be heated are placed on the surface wave transmission line in the direction of travel of the surface wave. A high-frequency thawing heating device that heats the lower side of an object to be heated is disclosed by using the feature that the side close to is strongly heated.

Further, in Patent Document 2, a tubular metal plate having slot holes is periodically placed in an environment in which microwaves are confined in a housing covered with a metal wall such as a microwave oven, and inside the tubular metal plate. By installing the object to be heated, a waveguide is formed by the metal wall and the tubular metal plate, and the surface wave generated in the slot holes periodically provided in the tubular metal plate causes the object to be heated. A high-frequency heater that can efficiently heat an object to be heated, such as a round shape or a tall object such as Tokuri, by intensively heating is disclosed.

Japanese Unexamined Patent Publication No. 8-166133 Jikkai Sho 57-78597

However, in the conventional configuration shown in Patent Document 1, when the shape of the object to be heated is round or the dimension in the height direction is large, only the lower side close to the surface wave transmission line is heated. Therefore, sufficient heat treatment cannot be performed.

Further, in the conventional configuration shown in Patent Document 2, it is said that sufficient heat treatment can be performed even when the shape of the object to be heated is round or the dimension in the height direction is large, but the metal wall A waveguide formed of a tubular metal plate cannot form an appropriate waveguide shape, and the shape of the waveguide changes depending on the size and placement position of the tubular metal plate. The surface wave generated in the slot hole periodically provided in the shaped metal plate is unstable, and the surface wave power enough to burn the surface of the object to be heated cannot be obtained.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a high-frequency heating device capable of sufficiently heat-treating a object to be heated having a round shape or a large height dimension. And.

In order to solve the conventional problems, the high frequency heating device of the present invention supplies high frequency power to at least one surface wave transmission line, at least one high frequency power generating unit for generating high frequency power, and the surface wave transmission line. The surface wave transmission line is configured to have a tubular shape, and the high frequency power generated by the high frequency power generation unit is transferred to the surface wave transmission line via the high frequency power supply unit. Power.

With this configuration, the high-frequency power generated by the high-frequency power generation unit is directly supplied to the surface wave transmission line configured in a tubular shape via the high-frequency power supply unit, so that the high-frequency power supplied to the surface wave transmission line is , It is efficiently converted into surface wave power propagating on the surface wave transmission line. As a result, even if the object to be heated installed inside the surface wave transmission line having a tubular shape has a round shape or a large height dimension, sufficient heat treatment can be performed.

Schematic diagram showing the basic configuration of the high frequency heating device of the first embodiment Schematic diagram showing the configuration of the high frequency power feeding unit of the first embodiment The figure which shows the propagation of the high frequency power fed to the surface wave transmission line of Embodiment 1. The figure which shows the state of the high frequency power radiated from the tubular surface wave transmission line of Embodiment 1. The figure which shows the electric field strength distribution formed in the vicinity of the tubular surface wave transmission line of Embodiment 1. Schematic diagram showing a configuration in which a short-circuited portion is provided in the surface wave transmission line of the first embodiment. A development view showing high-frequency power propagating in a surface wave transmission line provided with a short-circuited portion of the first embodiment. Schematic diagram showing the basic configuration of the high frequency heating device of the second embodiment The figure which shows the state of the high frequency power radiated from the surface wave transmission line of Embodiment 2. The figure which shows the electric field strength distribution formed in the vicinity of the surface wave transmission line of Embodiment 2. Schematic diagram showing the basic configuration of the high frequency heating device of the third embodiment A development view showing high-frequency power propagating on the surface wave transmission line of the third embodiment.

The first invention comprises at least one surface wave transmission line, at least one high frequency power generation unit that generates high frequency power, and at least one high frequency power supply unit that supplies high frequency power to the surface wave transmission line. The surface wave transmission line is formed in a tubular shape, and the high frequency power generated by the high frequency power generating unit is supplied to the surface wave transmission line via the high frequency power feeding unit to form a tubular shape. Since the high-frequency power generated by the high-frequency power generation unit is supplied to the surface wave transmission line via the high-frequency power supply unit, the object to be heated installed inside the surface wave transmission line configured in a tubular shape is heat-treated. , The high frequency power supplied to the surface wave transmission line is efficiently converted into the surface wave power propagating on the surface wave transmission line. As a result, even if the object to be heated installed inside the surface wave transmission line configured in a tubular shape has a round shape or a large height dimension, sufficient heating such as scorching the surface of the object to be heated over a wide area is performed. The treatment can be performed stably.

In the second invention, in particular, since the surface wave transmission line of the first invention forms a plate-like periodic structure, the degree of freedom in shape when the surface wave transmission line is formed into a tubular shape is increased. , The periodic structure is easy to process and can contribute to cost reduction.

The third invention, in particular, the second invention, wherein the high-frequency power feeding unit supplies high-frequency power to the surface wave transmission line by an electric field-coupled antenna, so that a surface wave having a periodic structure formed on a plate is formed. The matching with the transmission line is improved, and the efficiency of supplying high frequency power to the surface wave transmission line can be improved.

The fourth invention, in particular, according to any one of the first to third inventions, is that the surface wave transmission line is provided with a short-circuited portion, so that the high frequency propagates from the high frequency power feeding unit to the surface wave transmission line. Since the electric power is almost completely reflected at the short-circuit point and propagates in the surface wave transmission line again in the opposite direction, the amount of high-frequency power propagating in the surface wave transmission line to be absorbed by the object to be heated can be increased, and the surface wave transmission can be performed. It is possible to improve the heating efficiency by high-frequency power to the object to be heated installed inside the line.

In the fifth invention, in particular, in any one of the first to fourth inventions, a metal wall is installed outside the surface wave transmission line so as not to come into contact with the surface wave transmission line, so that the surface wave transmission line is provided. The high-frequency power radiated to the outside of the tubular surface wave transmission line can be reflected by the metal wall and guided inward without interfering with the propagation of the propagating high-frequency power, and is installed inside the surface wave transmission line. It is possible to improve the heating efficiency of the object to be heated by high-frequency power.

The sixth invention particularly includes the plurality of the high frequency power feeding portions according to any one of the first to fifth inventions, and the surface wave transmission line is a portion where a short circuit occurs between the adjacent high frequency power feeding portions. Is provided, a plurality of power feeding sections can be provided on the surface wave transmission line configured in a tubular shape, a partial heating state can be controlled, and the uniformity of heating can be improved.

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

(Embodiment 1)
FIG. 1 is a schematic view showing a basic configuration of a high frequency heating device 100 according to the first embodiment of the present invention. The high-frequency heating device 100 shown in the figure is a high-frequency heating device that heat-treats the object to be heated 102 installed inside the surface wave transmission line 101 by the surface wave transmission line 101 configured in a tubular shape. It includes a power generation unit 103 and a high frequency power supply unit 110.

In FIG. 1, the high frequency heating device 100 has at least one surface wave transmission line, at least one high frequency power generation unit, and at least one high frequency power supply unit, but the surface wave transmission line and high frequency The number of power generation units and high-frequency power supply units is not limited to this.

The high-frequency power generated by the high-frequency power generation unit 103 is supplied to the surface wave transmission line 101 via the high-frequency power supply unit 110.

The high-frequency power generating unit 103 is a high-frequency transmitter that outputs high-frequency power having a frequency (for example, 2.45 GHz microwave) and power suitable for heat-treating the object to be heated 102. For example, it may be composed of a magnetron and an inverter power supply circuit, or may be composed of a solid-state oscillator and a power amplifier.

A magnetron is a type of oscillating vacuum tube that generates strong non-coherent microwaves, which is a type of radio wave, and is often used in high-power applications of hundreds to several kilowatts such as radars and microwave ovens. Since a high voltage of several kilovolts is required to drive the magnetron, an inverter power supply is generally used as the drive power source for the magnetron. The inverter power supply is a power supply circuit composed of a converter circuit having a rectifying function and an inverter circuit having a step-up (or step-down) function and an output frequency conversion function, and is a technology widely used for lighting devices and motor control.

On the other hand, a solid-state oscillator is a semiconductor oscillator circuit in which a feedback circuit is composed of transistors and high-frequency electronic components such as capacitors, inductors, and resistors, and is a technology widely used in oscillators for low-power output applications such as communication equipment. .. In recent years, the high-frequency power output from a solid-state oscillator has a high output of about 50 watts, but generally it is about several tens of milliwatts to several hundreds of milliwatts, and several hundreds of watts for use in heat treatment applications. Since the output power of is required, generally, the high frequency power output from the solid-state oscillator is amplified by a power amplifier such as a transistor.

In the present invention, the configuration of the high frequency power generation unit 103 is not limited, and therefore detailed description thereof will be omitted.

The high-frequency power feeding unit 110 corresponds to a power connection unit that supplies high-frequency power generated by the high-frequency power generating unit 103 to the surface wave transmission line 101. The configuration of the high-frequency power feeding unit 110 will be described later.

The surface wave transmission line 101 is formed of a metal periodic structure in which impedance elements are periodically arranged on a metal plate, a dielectric plate, or the like. For example, in a metal periodic structure, it is possible to use a stub-type surface wave transmission line in which a plurality of metal plates are arranged at regular intervals on a metal plate, or an interdigital surface wave transmission line in which metal plates are punched in a cross-finger shape. As the dielectric plate, an alumina plate or a bakelite plate can be used. Further, in the interdigital type surface wave transmission line, a metal film can be plated on the surface of the resin plate.

In the present embodiment shown in FIG. 1, an example is shown in which an interdigital surface wave transmission line obtained by punching a metal flat plate in a cross-finger shape is formed in a cylindrical shape. By forming the surface wave transmission line in a plate shape to form a periodic structure, the degree of freedom in the tubular shape is increased, the processing is facilitated, and the cost can be reduced.

The surface wave transmission line 101 propagates the high frequency power supplied from the high frequency power generation unit 103 via the high frequency power feeding unit 110 by the surface wave, and the surface wave transmission line 101 is generated by the high frequency power radiated from the surface wave transmission line 101. The object to be heated 102 installed inside the 101 is heated.

Next, the configuration of the high-frequency power feeding unit 110 will be described with reference to the drawings.

FIG. 2 is a schematic view showing an example of the configuration of the high-frequency power feeding unit 110. FIG. 2A shows a plan view, and FIG. 2B shows a side sectional view.

In the figure, the high-frequency power generated by the high-frequency power generation unit 103 shown in FIG. 1 is guided to the high-frequency power supply unit 110 by using the coaxial cable line 111, and the high-frequency power is supplied to the surface wave transmission line 101 by the antenna 113. The configuration of the case is shown.

As shown in FIG. 2, the high-frequency power generated by the high-frequency power generation unit 103 is guided to the high-frequency power supply unit 110 by the coaxial cable wire 111, and the antenna 113 is attached to the core wire 112 of the coaxial cable wire 111. The tip of 113 is fixed to the surface wave transmission line 101 by a bolt 114. Further, the outer conductor of the coaxial cable line 111 is fixed to the coaxial cable line fixing protrusion 117 provided on the surface wave transmission line 101 by the coaxial cable line fixing tool 115 and the bolts 116a, 116b, 116c, 116d. ..

Due to the configuration of the high-frequency power feeding unit 110, the high-frequency power guided by the coaxial cable line 111 from the high-frequency power generating unit 103 is directly supplied to the surface wave transmission line 101 via the antenna 113. Here, in FIG. 2, the tip of the antenna 113 is fixed to the surface wave transmission line 101, and the outer skin conductor of the coaxial cable line 111 is fixed to the coaxial cable line fixing protrusion 117 provided on the surface wave transmission line 101. Bolts 114, 116a, 116b, 116c, 116d, and coaxial cable wire fixture 115 are used as the fixing means, but the fixing means are not limited to this, and at the frequency of the high frequency power used for heating. Any method can be used as long as the continuity can be reliably maintained. For example, a method such as fixing with a conductive tape or welding may be used.

With the above configuration, the high-frequency heating device 100 according to the present embodiment transfers the high-frequency power generated by the high-frequency power generation unit 103 to the surface wave transmission line 101 in a tubular shape via the high-frequency power supply unit 110. The high-frequency power supplied to the surface wave transmission line 101 is efficiently converted into the surface wave power propagating on the surface wave transmission line 101 by directly supplying power to the inside of the surface wave transmission line 101 configured in a tubular shape. The object to be heated 102 installed in the above can be subjected to a heat treatment such as browning.

Next, the operation of heat-treating the object to be heated 102 of the high-frequency heating device 100 described above will be described.

FIG. 3 is a diagram showing how the high-frequency power 120 generated by the high-frequency power generation unit 103 and supplied to the surface wave transmission line 101 via the high-frequency power supply unit 110 propagates through the surface wave transmission line 101. ..

As shown in FIG. 3, the high frequency power 120 supplied to the surface wave transmission line 101 via the high frequency power feeding unit 110 is distributed to the high frequency powers 121 and 122 propagating in the left and right two directions, and is distributed to the surface wave transmission line 101. Propagate along the groove of.

FIG. 4 shows that when high-frequency power is supplied from the high-frequency power feeding unit 110 to the surface wave transmission line 101 configured in a tubular shape, the high-frequency power propagating through the surface wave transmission line 101 radiates from the surface of the surface wave transmission line 101. It is a figure which showed the state of the high frequency power generated.

As shown in FIG. 4, the high-frequency power supplied from the high-frequency power feeding unit 110 is distributed to the high-frequency powers 123 and 124, and propagates on the surface wave transmission line 101 by surface waves, respectively. Then, the high-frequency powers 123 and 124 propagating on the surface wave transmission line 101 by surface waves generate high-frequency power 126 radiated from the surface of the surface wave transmission line 101 to the inside of the tubular shape and to the outside of the tubular shape. The radiated high frequency power 125 is generated. The object to be heated 102 is heated by the high-frequency electric power 126 radiated inside the tubular shape.

FIG. 5 is a diagram showing a state of the electric field strength distribution formed in the vicinity of the surface wave transmission line 101 when high frequency power is supplied from the high frequency power feeding unit 110 to the surface wave transmission line 101 configured in a tubular shape. Is.

As shown in FIG. 5, due to the high frequency power supplied from the high frequency power feeding unit 110 and propagating on the surface wave transmission line 101 by the surface wave, the inner electric field strength distribution 130 and the outer electric field are in the vicinity of the surface wave transmission line 101. The intensity distribution 131 is formed respectively. Here, the electric field strength distributions 130 and 131 shown in the figure indicate the magnitude of the electric field strength by the color depth, and the darker the color, the larger the magnitude of the electric field strength.

As shown in FIG. 5, the electric field strength distribution formed in the vicinity of the surface wave transmission line 101 is such that the vicinity of the surface of the surface wave transmission line 101 is found in both the inner electric field strength distribution 130 and the outer electric field strength distribution 131. The magnitude of the electric field strength is the largest, and the magnitude of the electric field strength decreases as the distance from the surface of the surface wave transmission line 101 increases. Further, the electric field strength distribution 131 on the outside is lighter in color because the high-frequency power radiated from the surface wave transmission line 101 is diffused to the outer space, so that the magnitude of the electric field strength is smaller as a whole. On the other hand, in the electric field strength distribution 130 on the inner side, the high-frequency power radiated from the surface wave transmission line 101 is concentrated in the central direction, so that the electric field strength is large and the color is darkened as a whole.

That is, it is shown that high-frequency power is concentrated inside the surface wave transmission line 101 formed in a tubular shape, and although not shown, an object to be heated is installed inside the surface wave transmission line 101 formed in a tubular shape. By doing so, the electric field strength distribution 130 formed inside the surface wave transmission line 101 allows high-frequency power to be concentrated on the object to be heated, and heat treatment such as burning the object to be heated can be performed.

With the above configuration, the high-frequency heating device 100 according to the present embodiment transfers the high-frequency power generated by the high-frequency power generation unit 103 to the surface wave transmission line 101 configured in a tubular shape via the high-frequency power supply unit 110. By directly feeding the power, the high frequency power fed to the surface wave transmission line 101 is efficiently converted into the surface wave power propagating on the surface wave transmission line 101. As a result, even if the object to be heated 102 installed inside the surface wave transmission line 101 having a tubular shape has a round shape or a large height dimension, sufficient heat treatment such as scorching the surface can be stably performed. Can be applied.

Here, as the antenna 113 shown in FIG. 2, an electric field coupling type antenna in which electric power is transmitted by an electric field generated when the electrodes are close to each other may be used.

As a result, in a surface wave transmission line in which a surface wave is formed and propagated by an electric field generated between flat plate conductors, such as an interdigital type surface wave transmission line composed of flat plate conductors, an electric field coupling type antenna is used as a power feeding means. By using it, it becomes easy to match with the surface wave transmission line, so that the conversion efficiency to the surface wave power can be improved.

Further, the surface wave transmission line having a tubular shape may be provided with a portion that is short-circuited at a high frequency at the frequency of the high frequency power used for the heat treatment.

FIG. 6 shows a state in which the surface wave transmission line 101 is replaced with a surface wave transmission line 150 provided with a high-frequency short-circuited portion in the line in the high-frequency heating device 100 shown in FIG. As shown in the figure, the surface wave transmission line 150 is provided with a short-circuit portion 151 that is short-circuited at a high frequency at the frequency of the high-frequency power used for the heat treatment at a portion corresponding to the facing portion of the high-frequency power feeding unit 110. There is.

FIG. 7 is a development view of the surface wave transmission line 150 shown in FIG. 6 from the BB'planet, and shows how the high frequency power supplied from the high frequency power feeding unit 110 propagates on the surface wave transmission line 150. Is shown. As shown in the figure, the high-frequency power 160 generated by the high-frequency power generation unit 103 and supplied to the surface wave transmission line 150 via the high-frequency power supply unit 110 has the high-frequency power 161 propagating to the right and the high-frequency power 160 to the left. It is distributed to the propagating high frequency power 162. After that, the high-frequency power 163 that reaches the short-circuit portion 153 and the high-frequency power 164 that reaches the short-circuit portion 154 are almost totally reflected at the short-circuit portion, and propagate as high-frequency powers 165 and 166 that propagate in the opposite directions.

As a result, the high-frequency power supplied from the high-frequency power feeding unit 110 and propagating on the surface wave transmission line 150 is almost completely reflected by the short-circuit portions 153 and 154 and propagates on the surface wave transmission line 150 again in the opposite direction. The amount of high-frequency power transmitted through the wave transmission line 150 absorbed by the object to be heated 102 can be increased, and the heating efficiency to the object to be heated 102 installed inside the surface wave transmission line 150 can be improved.

(Embodiment 2)
Hereinafter, Embodiment 2 of the present invention will be described with reference to the drawings.

In the description of the second embodiment, the same reference numerals are given to the components having the same functions as those of the first embodiment, and the description thereof will be omitted. Further, the description of the content having the same action as that of the first embodiment will be omitted.

FIG. 8 is a schematic view showing the configuration of the high frequency heating device 200 according to the second embodiment of the present invention.

The high-frequency heating device 200 shown in the figure further includes a tubular metal wall 201 as compared with the high-frequency heating device 100 according to the first embodiment shown in FIG.

The tubular metal wall 201 is installed on the outside of the tubular surface wave transmission line 101 so as not to come into contact with the surface wave transmission line 101. The distance between the outer surface of the surface wave transmission line 101 and the metal wall 201 is preferably about 3 mm to 10 mm, but is not limited to this.

The metal wall 201 may be a metal plate formed into a tubular shape or a resin plate formed into a tubular shape plated with metal.

Similar to the first embodiment, the high frequency power generated by the high frequency power generation unit 103 is supplied to the surface wave transmission line 101 formed in a tubular shape via the high frequency power supply unit 110. The high-frequency power supplied to the surface wave transmission line 101 propagates through the surface wave transmission line 101 as surface wave power, and the high-frequency power radiated from the surface of the surface wave transmission line 101 is used to form a tubular surface wave transmission line. The object to be heated 102 installed inside the 101 is heat-treated.

Next, the operation of heat-treating the object to be heated 102 of the high-frequency heating device 200 described above will be described.

FIG. 9 shows that when high-frequency power is supplied from the high-frequency power feeding unit 110 to the surface wave transmission line 101 having a tubular shape, the high-frequency power propagating through the surface wave transmission line 101 radiates from the surface of the surface wave transmission line 101. It is a figure which showed the state of the high frequency power generated.

As shown in FIG. 9, the high-frequency power supplied from the high-frequency power feeding unit 110 is distributed to the high-frequency powers 221 and 222, and propagates on the surface wave transmission line 101 by surface waves, respectively. Then, the high-frequency powers 221 and 222 propagating on the surface wave transmission line 101 as surface waves generate high-frequency power 223 radiated from the surface of the surface wave transmission line 101 to the inside of the cylinder and radiated to the outside. High frequency power 224 is generated. The high-frequency power 223 radiated inside the tubular shape is radiated toward the center of the tubular shape and directly contributes to the heating of the object to be heated 102. On the other hand, the high-frequency power 224 radiated to the outside of the tubular shape is reflected by the tubular metal wall 201 and radiated toward the center of the tubular shape.

As a result, both the high-frequency power 223 radiated inside the tubular shape and the high-frequency power 224 radiated outside from the surface of the surface wave transmission line 101 are installed inside the surface wave transmission line 101 configured in a tubular shape. Contributes to heating the object to be heated 102.

FIG. 10 is a diagram showing a state of the electric field strength distribution formed in the vicinity of the surface wave transmission line 101 when high frequency power is supplied from the high frequency power feeding unit 110 to the surface wave transmission line 101 configured in a tubular shape. Is.

As shown in FIG. 10, due to the high frequency power supplied from the high frequency power feeding unit 110 and propagating on the surface wave transmission line 101 by the surface wave, the inner electric field strength distribution 230 and the outer electric field are in the vicinity of the surface wave transmission line 101. The intensity distribution 231 is formed respectively. Here, the electric field strength distributions 230 and 231 shown in the figure indicate the magnitude of the electric field strength by the color depth, and the darker the color, the larger the magnitude of the electric field strength.

As shown in FIG. 10, in the electric field strength distribution formed in the vicinity of the surface wave transmission line 101, the high frequency power radiated from the surface wave transmission line 101 to the outside is reflected by the metal wall 201 and radiated inward. By being superimposed on the high-frequency power, the magnitude of the electric field strength of the inner electric field strength distribution 230 becomes large and the color becomes very dark.

With the above configuration, the high-frequency heating device 200 according to the present embodiment is generated by the high-frequency power generation unit 103, and is supplied to the surface wave transmission line 101 formed in a tubular shape via the high-frequency power supply unit 110. It is possible to significantly improve the contribution rate of high-frequency power to the heating of the object to be heated 102 installed inside the surface wave transmission line 101 having a tubular shape. As a result, even if the object to be heated 102 installed inside the surface wave transmission line 101 having a tubular shape has a round shape or a large height dimension, sufficient heat treatment such as scorching the surface can be stably performed. And it can be applied with high efficiency.

(Embodiment 3)
Hereinafter, Embodiment 3 of the present invention will be described with reference to the drawings.

In the description of the third embodiment, the same reference numerals will be given to the components having the same functions as those of the first and second embodiments described above, and the description thereof will be omitted. Further, the description of the content having the same action as that of the first and second embodiments described above will be omitted.

FIG. 11 is a schematic view showing the configuration of the high frequency heating device 300 according to the third embodiment of the present invention.

The high-frequency heating device 300 shown in the figure is compared with the configuration of the high-frequency heating device 100 according to the first embodiment shown in FIGS. 1 and 6, and the surface wave transmission is performed instead of the surface wave transmission line 101 or the surface wave transmission line 150. The line 301 is provided, the high frequency power generation unit 303 is provided instead of the high frequency power generation unit 103, and the adjacent first high frequency power supply unit 310a and the second high frequency power supply unit 310b are provided instead of the high frequency power supply unit 110 for heating. In the frequency of the high frequency power used for processing, instead of the short-circuit portion 151, the first short-circuit portion 320a and the second short-circuit portion 320b are placed between the adjacent first high-frequency power feeding portion 310a and the second high-frequency power feeding portion 310b. To be equipped.

In FIG. 11, the high-frequency heating device 300 has one high-frequency power generation unit, two high-frequency power supply units, and two short-circuit units for one surface wave transmission line. The number of high-frequency power generators, high-frequency power supply units, and short-circuit units for one surface wave transmission line is not limited to this.

The high-frequency power generated by the high-frequency power generation unit 303 is distributed and supplied to the surface wave transmission line 301 configured in a tubular shape via the first high-frequency power supply unit 310a and the second high-frequency power supply unit 310b, respectively. Will be done. The configuration of the high-frequency power generation unit 303, the first high-frequency power supply unit 310a, and the second high-frequency power supply unit 310b is the high-frequency power generation unit 103 and the high-frequency power supply unit described in the first embodiment described above. Since it is the same as the configuration of 110, the description thereof will be omitted.

Further, the surface wave transmission line 301 is provided with a first short-circuited portion 320a and a second short-circuited portion 320b between the first high-frequency power feeding unit 310a and the second high-frequency power feeding unit 310b. .. Since the configurations of the first short-circuit portion 320a and the second short-circuit portion 320b are the same as the configurations of the short-circuit portion 151 described in the first embodiment described above, the description thereof will be omitted.

FIG. 12 is a development view of the surface wave transmission line 301 shown in FIG. 11 from the CC'planet, and is fed from the first high-frequency power feeding unit 310a and the second high-frequency power feeding unit 310b, respectively. It shows how the high frequency power propagates on the surface wave transmission line 301.

As shown in the figure, the high frequency power 330a generated by the high frequency power generation unit 303 and supplied to the surface wave transmission line 301 via the first high frequency power supply unit 310a is the high frequency power 331a propagating to the right. It is distributed to the high frequency power 332a propagating to the left. After that, the high-frequency power 333a reaching the short-circuited portion 320a and the high-frequency power 334a reaching the short-circuited portion 320b are almost totally reflected at each short-circuited portion, and propagate as high-frequency powers 335a and 336a propagating in the opposite directions.

On the other hand, the high frequency power 330b fed to the surface wave transmission line 301 via the second high frequency power feeding unit 310b is distributed to the high frequency power 331b propagating to the right and the high frequency power 332b propagating to the left. After that, the high-frequency power 333b reaching the short-circuited portion 320b and the high-frequency power 334b reaching the short-circuited portion 320a are almost totally reflected at each short-circuited portion, and propagate as high-frequency powers 335b and 336b propagating in the opposite directions.

That is, the high-frequency power supplied from the adjacent first high-frequency power feeding unit 310a and the second high-frequency power feeding unit 310b to the surface wave transmission line 301 is separated by the first short-circuiting portion 320a and the second short-circuiting portion 320b. Will be done. As a result, the first heating region 340a in which the object to be heated 102 is heat-treated by the high-frequency power 330a supplied from the first high-frequency power feeding unit 310a, and the high-frequency power supplied from the second high-frequency power feeding unit 310b. A second heating region 340b in which the object to be heated 102 is heat-treated is formed by the 330b.

As a result, the high-frequency power supplied from the first high-frequency power feeding unit 310a and the second high-frequency power feeding unit 310b and propagating on the surface wave transmission line 301 is generated by the first short-circuiting portion 320a and the second short-circuiting portion. The 320b separates the first heating region 340a and the second heating region 340b, and a plurality of power feeding sections can be provided in one tubular surface wave transmission line, so that the partial heating state can be controlled. At the same time, the uniformity of heating can be improved.

In the present embodiment, one high-frequency power generation unit 303 is distributed and high-frequency power is supplied to the first high-frequency power supply unit 310a and the second high-frequency power supply unit 310b. High-frequency power generation units may be provided, and high-frequency power from different high-frequency power generation units may be supplied to a plurality of high-frequency power supply units.

The high-frequency heating device according to the present invention has been described above based on each embodiment, but the present invention is not limited to this embodiment. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the embodiment, and a form constructed by combining components in different embodiments is also included in the scope of the present invention. ..

The present invention is a high-frequency heating device that heat-treats an object to be heated by supplying high-frequency power to a surface wave transmission line, and even if the object to be heated has a round shape or a large height dimension, the surface is scorched. It is useful as cooking appliances such as microwave heaters because it can stably perform sufficient heat treatment.

100 High-frequency heating device 101,150 Surface wave transmission line 102 Heated object 103 High-frequency power generator 110 High-frequency power supply unit 111 Coaxial cable wire 112 Coaxial cable core wire 113 Antenna 114, 116a, 116b, 116c, 116d Bolt 115 Fixture 117 Coaxial Cable line fixing protrusions 120, 121, 122, 123, 124 High-frequency power 125,126 High-frequency power 130, 131 Electric power distribution 151,153,154 Short-circuited part 160,161,162,163,164,165,166 High-frequency power 200 High-frequency heating device 201 Metal wall 211,222 High-frequency power 223,224 High-frequency power 230,231 Electricity strength distribution 300 High-frequency heating device 301 Surface wave transmission line 303 High-frequency power generator 310a, 310b High-frequency power supply section 320a, 320b Short-circuit section 330a , 330b High-frequency power 331a, 331b High-frequency power 332a, 332b High-frequency power 333a, 333b High-frequency power 334a, 334b High-frequency power 335a, 335b High-frequency power 336a, 336b High-frequency power 340a, 340b Heating region

Claims (6)

With at least one surface wave transmission line,
At least one high-frequency power generator that generates high-frequency power,
The surface wave transmission line is provided with at least one high-frequency power feeding unit that supplies high-frequency power.
The surface wave transmission line is a high-frequency heating device having a tubular shape and supplying high-frequency power generated by the high-frequency power generation unit to the surface wave transmission line via the high-frequency power supply unit. The high-frequency heating device according to claim 1, wherein the surface wave transmission line has a plate-shaped periodic structure. The high-frequency heating device according to claim 2, wherein the high-frequency power feeding unit supplies high-frequency power to the surface wave transmission line by an electric field-coupled antenna. The high-frequency heating device according to any one of claims 1 to 3, wherein the surface wave transmission line is provided with a short-circuited portion. The high-frequency heating device according to any one of claims 1 to 4, wherein a metal wall is provided outside the surface wave transmission line so as not to come into contact with the surface wave transmission line. The method according to any one of claims 1 to 5, wherein the surface wave transmission line includes a plurality of the high-frequency power feeding units, and the surface wave transmission line is provided with a short-circuited portion between the adjacent high-frequency power feeding units. High frequency heating device.