JPWO2020079812A1 - Dielectric heating device - Google Patents

Abstract

In the dielectric heating device (1), the electrode (5) is arranged so as to fit in the space where the electrode (3) and the electrode (4) face each other, and the facing area between the electrode (3) and the electrode (4) is , The area facing the electrode (5) is larger, and the electrode (3) and the electrode (5) and the electrode (4) and the electrode (5) function as a capacitor having an object to be heated (7) between the electrodes. Then, a high-frequency signal is applied to the electrodes (5) from the signal source (2), and the object to be heated (7) is heated by the electric field generated between the electrodes.

Description

The present invention relates to a dielectric heating device.

For example, Patent Document 1 describes an irradiation device that heats an object to be heated by irradiating it with a high frequency wave. This irradiation device includes a main body having a cavity, a linear antenna protruding inside the cavity, and a container having a recess for accommodating the linear antenna. In the container, a recess is fitted in a linear antenna protruding inside the cavity of the main body, and the heated object is heated by irradiating the heated object in the container with a high frequency radiated from the linear antenna.

Japanese Unexamined Patent Publication No. 2006-210305

The irradiation device described in Patent Document 1 has a problem that an electric field generated by a high frequency signal is likely to leak.

The present invention solves the above problems, and an object of the present invention is to obtain a dielectric heating device capable of reducing electric field leakage.

The dielectric heating device according to the present invention includes a signal source that generates a high-frequency signal, a grounded first electrode, a second electrode that is arranged to face the first electrode and is grounded, and a first electrode. The first electrode or the second electrode holds the third electrode connected to the signal source and the object to be heated so that the electrode and the second electrode are arranged so as to fit in the opposite space. A container for supplying an object to be heated is provided between at least one of the electrodes and the third electrode, and the facing area between the first electrode and the second electrode is larger than the facing area with the third electrode. Largely, the first electrode and the third electrode and the second electrode and the third electrode function as capacitors, and the high frequency signal from the signal source is applied to the third electrode and the electric field generated between the electrodes causes the electrode. It is characterized by heating an object to be heated.

According to the present invention, the third electrode is arranged so as to fit in the space where the first electrode and the second electrode face each other, and the facing area between the first electrode and the second electrode is the first. Larger than the area facing the 3rd electrode, the 1st and 3rd electrodes and the 2nd and 3rd electrodes function as capacitors, and the electric field generated between the electrodes heats the object to be heated. .. As a result, an electric field is locally generated in the space where the first electrode and the second electrode face each other, so that leakage of the electric field can be reduced.

FIG. 1A is a top view showing the configuration of the dielectric heating device according to the first embodiment. FIG. 1B is a cross-sectional arrow diagram showing a cross section of the dielectric heating device according to the first embodiment cut along the line AA of FIG. 1A. FIG. 1C is a cross-sectional arrow diagram showing a cross section of the dielectric heating device according to the first embodiment cut along the line BB of FIG. 1A. FIG. 2A is a top view showing electric lines of force formed by an electric field generated between two electrodes arranged in parallel. FIG. 2B is a top view showing electric lines of force formed by an electric field generated between three electrodes arranged in parallel. FIG. 2C is a top view showing electric lines of force formed by an electric field generated between electrodes in the dielectric heating device according to the first embodiment. It is a top view which shows the modification of the electrode structure in the dielectric heating apparatus which concerns on Embodiment 1. FIG. It is a top view which shows another modification of the electrode structure in the dielectric heating apparatus which concerns on Embodiment 1. FIG. It is a top view which shows the further modification of the electrode structure in the dielectric heating apparatus which concerns on Embodiment 1. FIG. FIG. 6A is a top view showing the configuration of the dielectric heating device according to the second embodiment. FIG. 6B is a cross-sectional arrow diagram showing a cross section of the dielectric heating device according to the second embodiment cut along the DD line of FIG. 6A. It is a top view which shows the structure of the dielectric heating apparatus which concerns on Embodiment 3.

Embodiment 1.
FIG. 1A is a top view showing the configuration of the dielectric heating device 1 according to the first embodiment. FIG. 1B is a cross-sectional arrow diagram showing a cross section of the dielectric heating device 1 cut along the line AA of FIG. 1A. The thick arrows shown in FIGS. 1A and 1B indicate the direction in which the object to be heated 7 flows in the container 6. FIG. 1C is a cross-sectional arrow diagram showing a cross section of the dielectric heating device 1 cut along the line BB of FIG. 1A. The symbol with a black circle in the circle indicates that the object to be heated 7 flows from the back side of the paper to the front side. The dielectric heating device 1 is a device that vaporizes the object to be heated 7 by dielectric heating, and includes a signal source 2, an electrode 3, an electrode 4, an electrode 5, and a container 6 as shown in FIG. 1A.

Dielectric heating is a phenomenon in which electric dipoles inside a dielectric, which is the object to be heated 7, rotate due to a high-frequency electric field, and the rotated electric dipoles cause friction to generate heat inside the dielectric. Further, in dielectric heating, a phenomenon in which a part of electric energy applied to a dielectric is converted into thermal energy and dissipated is called dielectric loss. A member having a small dielectric loss is less likely to be heated by a high-frequency electric field, and a member having a large dielectric loss is likely to be heated by a high-frequency electric field.

The signal source 2 is a signal source that generates a high-frequency signal, and has an output terminal a that outputs a high-frequency signal and a ground terminal b that has a zero potential. The high frequency signal generated by the signal source 2 is output to the electrode 5 via the output terminal a. The ground terminal b of the signal source 2 may be connected to the ground (0 potential) of the dielectric heating device 1.

As the signal source 2, any one of a crystal oscillator, a rubidium oscillator, a voltage controlled oscillator (VCO), a direct digital synthesizer (DDS), and a phase-locked loop (PLL) circuit capable of outputting a signal of an arbitrary frequency is used. You may. However, the configuration of the oscillator used for the signal source 2 does not matter as long as it is an oscillator capable of generating a high frequency signal. The high frequency signal output from the signal source 2 may be a sine wave, a square wave, a continuous wave (CW) signal, or a modulated signal. ..

The electrode 3 is a first electrode connected to the ground terminal b of the signal source 2 and grounded, and is a conductor that generates an electric field with the electrode 5. For example, a metal flat plate capable of passing an electric current is used for the electrode 3. The surface of the electrode 3 facing the electrode 4 is composed of an area three times or more larger than the surface of the electrode 5 facing the electrode 3. The material constituting the electrode 3 may be any material that can generate a high-frequency electric field with the electrode 5, and a plurality of materials may be used for the electrode 3.

The electrode 4 is a second electrode arranged facing the electrode 3 and connected to the ground terminal b of the signal source 2 and grounded, and is a conductor that generates an electric field with the electrode 5. For example, a metal flat plate capable of passing an electric current is used for the electrode 4. The surface of the electrode 4 facing the electrode 3 is composed of an area three times or more larger than the surface of the electrode 5 facing the electrode 4. The material constituting the electrode 4 may be any material that can generate a high-frequency electric field with the electrode 5, and a plurality of materials may be used for the electrode 4.

The electrode 5 is a third electrode that is arranged so as to fit in the space where the electrode 3 and the electrode 4 face each other and is connected to the signal source 2. As shown in FIG. 1A, the electrode 5 is an electrode smaller than the electrode 3 and the electrode 4, and is arranged so as to fit in the space where the electrode 3 and the electrode 4 face each other without protruding from the space facing each other. For example, the electrode 5 is configured to have a length of 1/10 or less of the wavelength of the frequency of the high-frequency signal from the feeding point of the high-frequency signal generated by the signal source 2.

The electrode 5 is connected to the output terminal a of the signal source 2, and the high frequency signal generated by the signal source 2 is applied to the electrode 5 via the output terminal a. The electrode 3 and the electrode 5 and the electrode 4 and the electrode 5 function as a capacitor having an object to be heated 7 between the electrodes, and when a high frequency signal is applied to the electrode 5 from the signal source 2, the electrode 3 and the electrode 5 are connected to each other. An electric field is generated between the electrodes and between the electrodes 4 and 5. For example, a metal flat plate capable of passing an electric current is used for the electrode 5. The material constituting the electrode 5 may be any material that can generate a high-frequency electric field between the electrode 3 and the electrode 4, and a plurality of materials may be used for the electrode 5.

The container 6 is a container that holds the object to be heated 7 and supplies the object to be heated 7 between the electrodes 3 and 5 and between the electrodes 4 and 5. For example, as shown in FIG. 1A, the container 6 has both a supply path arranged between the electrodes 3 and 5 and a supply path arranged between the electrodes 4 and 5. It may be an annular container with an open upper surface side. The object to be heated 7 flows through the supply path. In the container 6, the supply path is sandwiched between the electrode 3 and the electrode 5, and the supply path is sandwiched between the electrode 4 and the electrode 5, and the container 6 is fixed to the electrode side.

Glass may be used as the material constituting the container 6. Although the annular container 6 is shown, the present invention is not limited to this. The object to be heated 7 is held without leakage, the electrode 3 and the electrode 5 are not short-circuited, the electrode 4 and the electrode 5 are not short-circuited, and between the electrode 3 and the electrode 5 and between the electrode 4 and the electrode 5. The material and shape of the container 6 may be used as long as it can withstand the heat generated in the container 6. Further, a plurality of materials may be used for the container 6.

The object to be heated 7 may be a liquid that is vaporized by heating, and examples thereof include water and tobacco liquid. As shown by the broken line arrows in FIGS. 1B and 1C, the aerosol, which is the vaporized object 7 to be heated, is taken out from the opening on the upper surface side of the container 6. If the liquid object 7 to be heated does not leak to the outside of the container 6, the opening may be provided in a portion other than the upper surface side of the container 6.

Further, the container 6 can be separated from the electrode side by removing the supply path from between the electrode 3 and the electrode 5 and removing the supply path from between the electrode 4 and the electrode 5. Thereby, the container 6 in which the amount of the object to be heated 7 is reduced can be removed from the electrode side and replaced with the container 6 replenished with the object 7 to be heated.

The container 6 may be configured so that a portion other than the supply path is removable. For example, a portion connecting the supply path arranged between the electrode 3 and the electrode 5 and the supply path arranged between the electrode 4 and the electrode 5 may be configured as a removable tank. When the amount of the object to be heated 7 in the container 6 is reduced, the tank is removed and replaced with a tank filled with the object to be heated 7.

Next, the operation of the dielectric heating device 1 will be described.
The high frequency signal generated by the signal source 2 is applied to the electrode 5 via the output terminal a. The electrode 3 and the electrode 5 function as a capacitor having a dielectric constant ε of the object to be heated 7 existing in the region C1, and the electrode 4 and the electrode 5 have a dielectric constant ε of the object 7 to be heated existing in the region C2. Functions as a capacitor. When a high-frequency signal is applied to the electrode 5, a high-frequency electric field is generated in the regions C1 and C2. As a result, the objects to be heated 7 existing in the regions C1 and C2 are heated.

As shown in FIG. 1B, the effective areas of the surfaces where the electrodes 3 and 5 face each other and the surfaces where the electrodes 4 and 5 face each other are S, and as shown in FIG. 1C, the electrodes 3 and 5 Let d be the distance between the spaces and between the electrodes 3 and 5. At this time, each capacitance Cp of the capacitor composed of the electrode 3 and the electrode 5 and the capacitor composed of the electrode 4 and the electrode 5 can be expressed by the following equation (1).
Cp = εS / d ・ ・ ・ (1)

When the dielectric loss of the object to be heated 7 is tan δ, the angular frequency of the high frequency signal applied to the electrode 5 is ω, and the voltage amplitude is E, the capacitor is applied to the object to be heated 7 as heat generation energy. The electric power P can be expressed by the following equation (2).
P = ωCpE ² tanδ = ω (εS / d) E ² tanδ ・ ・ ・ (2)

The electric power Po applied per unit volume of the object to be heated 7 in the capacitor can be expressed by the following equation (3) using the above equation (2). As is clear from the following equation (3), the smaller the distance d between the electrodes, the larger the electric power Po applied per unit volume of the object to be heated 7, and the object 7 to be heated is heated efficiently.
Po = P / (S × d) = ωεE ² tan δ / d ² ... (3)

Generally, in order for the counter electrode to function as a capacitor, it is necessary to determine the size of the electrode so that the high frequency signal between the electrodes can be treated as a lumped constant rather than as a distributed constant. By making the length of the electrode 5 from the feeding point sufficiently smaller than the wavelength of the frequency of the high-frequency signal applied from the signal source 2 to the feeding point, for example, about 1/10 of the wavelength. It is possible to treat a high frequency signal as a concentration constant between the electrode 3 and the electrode 5 and between the electrode 4 and the electrode 5.

The object to be heated 7 that has been heated and vaporized in the regions C1 and C2 is taken out as an aerosol from the opening of the container 6. When the object 7 to be heated is lost as an aerosol, in the container 6, a flow of the object 7 to be heated occurs in the direction indicated by the thick arrow in FIGS. 1A and 1B and the direction indicated by the symbol in FIG. The object to be heated 7 is supplied to the region C1 and the region C2 so as to supplement the above.

The heated object 7 is held in the container 6 in a cycle in which the heated object 7 is heated between the electrodes and the heated object 7 is supplied between the container 6 and the electrodes so as to supplement the heated object 7 vaporized by heating. Is repeated until is reduced and cannot be supplied between the electrodes. The direction of flowing the heated object 7 shown in FIGS. 1A, 1B and 1C is an example, and if the heated object 7 can be supplied to the regions C1 and C2, the direction of flowing the heated object 7 will be. It doesn't matter.

Further, in the dielectric heating device 1, the electrode 3, the electrode 4 and the electrode 5 are configured so that the region C1 and the region C2 are smaller and narrower than the size of the container 6. As a result, in the dielectric heating device 1, the object to be heated 7 is locally heated, so that the time required for the object to be heated 7 to vaporize is shortened.

Next, the leakage of the high frequency electric field will be described.
FIG. 2A is a top view showing electric lines of force formed by an electric field generated between two electrodes arranged in parallel. In FIG. 2A, solid arrows indicate lines of electric force. The signal source 100 is a signal source that generates a high frequency signal like the signal source 2. The electrode 101 and the electrode 102 are two parallel plate electrodes having the same size.

The electrode 101 is connected to the ground terminal b of the signal source 100 and is grounded. The electrode 102 is connected to the output terminal a of the signal source 100, and the high frequency signal generated by the signal source 100 is applied to the electrode 102 via the output terminal a. When a high-frequency signal is applied to the electrode 102, an electric field is generated by the high-frequency signal to form electric lines of force from the electrode 102 to the electrode 101.

However, the electric field is generated not only from the space where the electrode 101 and the electrode 102 face each other, but also from the surface of the electrode 102 opposite to the electrode 101, as shown by being surrounded by a broken line in FIG. 2A. A line is formed. Further, the electric field lines are concentrated on the electrode end due to the electrode end effect. In this way, the electric field generated outside the space where the electrode 101 and the electrode 102 face each other leaks to the outside of the dielectric heating device.

FIG. 2B is a top view showing electric lines of force formed by an electric field generated between three electrodes arranged in parallel. In FIG. 2B, solid arrows indicate lines of electric force. The electrode structure shown in FIG. 2B has an electrode 103 arranged to face the electrode 102 in addition to the structure shown in FIG. 2A. The electrode 103 is connected to the ground terminal b of the signal source 100 and is grounded. In the electrode structure shown in FIG. 2B, by arranging the grounded electrode 103 so as to face the surface of the electrode 102 opposite to the electrode 101, electric field leakage is suppressed as compared with the electrode structure shown in FIG. 2A. Be done.

However, since the electrode 101, the electrode 102, and the electrode 103 are flat plate electrodes having the same size as each other, the end portion of the electrode 102 faces the boundary between the outside of the space where the electrode 101 and the electrode 103 face each other. .. The lines of electric force formed by the electric field generated between the electrodes 101 and 102 and between the electrodes 103 and 102 are located at the ends of the electrodes due to the end effect of the electrodes, as shown by the broken lines in FIG. 2B. concentrate. Therefore, the electric field leaks from the space where the electrode 101 and the electrode 103 face each other.

FIG. 2C is a top view showing electric lines of force formed by an electric field generated between the electrodes in the dielectric heating device 1. In FIG. 2C, solid arrows indicate lines of electric force. In the dielectric heating device 1, the electrode 5 is an electrode smaller than the electrode 3 and the electrode 4, and is arranged so as to fit in the space where the electrode 3 and the electrode 4 face each other without protruding from the space facing each other. The electrode 3, the electrode 4, and the electrode 5 are configured such that, for example, the facing area between the electrode 3 and the electrode 4 is three times or more larger than the facing area between the electrode 3 or the electrode 4 and the electrode 5. As a result, as shown in FIG. 2C, the lines of electric force are concentrated in the vicinity of the electrode 5 in the space where the electrodes 3 and 4 face each other, so that the leakage of the electric field is suppressed as compared with the electrode structure shown in FIG. 2A. ..

Further, since the dielectric heating device 1 heats the object to be heated 7 by an electric field locally generated in the vicinity of the electrode 5, the time required for the object to be heated 7 to vaporize can be shortened.
Further, in the dielectric heating device 1, since an electric field blocking member for suppressing electric field leakage is not used other than the electrode 3, the electrode 4, and the electrode 5, the device can be miniaturized.

Next, a modified example of the electrode structure in the dielectric heating device 1 will be described.
FIG. 3 is a top view showing a modified example of the electrode structure in the dielectric heating device 1. In the electrode structure shown in FIG. 3, the columnar electrode 5A is arranged in the space where the electrode 3 and the electrode 4 face each other. The electrode 3 and the electrode 4 are parallel plate electrodes having the same size. When the high-frequency signal generated by the signal source 2 is applied to the columnar electrode 5A via the output terminal a, as shown in FIG. 3, between the electrode 3 and the electrode 5A and between the electrode 4 and the electrode 5A. An electric field is generated between them.

As shown in FIGS. 1A and 1C, the flat plate-shaped electrode 5 comes into surface contact with the supply path of the container 6 when the supply path of the container 6 is sandwiched between the electrode 3 and the electrode 4, so that the electrode The contact area between 5 and the container 6 is large. Therefore, when the container 6 is removed from the electrode side, the electrode 5 is easily deformed due to friction with the container 6. When the electrode 5 is deformed, the electrical characteristics of the electrode 5 change, so that the heating efficiency also changes.

On the other hand, the columnar electrode 5A has a smaller contact area with the container 6 than the flat electrode 5. Therefore, deformation of the electrode 5A due to friction with the container 6 is unlikely to occur, so that changes in electrical characteristics and heating efficiency due to deformation of the electrode 5A can be suppressed.

FIG. 4 is a top view showing another modification of the electrode structure in the dielectric heating device 1. In the electrode structure shown in FIG. 4, a columnar electrode 5A is arranged between the electrode 3A and the electrode 4A. As shown in FIG. 4, the end of the electrode 3A is bent toward the electrode 5A, and the end of the electrode 4A is also bent toward the electrode 5A. When a high-frequency signal is applied from the signal source 2 to the electrode 5A via the output terminal a, an electric field is generated between the electrodes 3A and 5A and between the electrodes 4A and 5A.

The lines of electric force from the space where the electrode 3A and the electrode 4A face each other to the outside of the space are gathered at each end of the electrode 3A and the electrode 4A due to the end effect of the electrode. Since each end of the electrode 3A and the electrode 4A is bent toward the electrode 5A, the electric lines of force are formed so as to fit in the space where the electrode 3A and the electrode 4A face each other. As a result, leakage of the electric field can be suppressed.

FIG. 5 is a top view showing still another modification of the electrode structure in the dielectric heating device 1. In the electrode structure shown in FIG. 5, the electrode 5A is arranged in the space where the electrode 3B and the electrode 4B face each other. A convex portion 8 is formed on each facing surface of the electrode 3B and the electrode 4B. The convex portion 8 is a rib-shaped convex portion that is long in the height direction of the electrode, and two convex portions 8 are arranged with respect to one electrode surface. As shown in FIG. 5, the two convex portions 8 divide the inside of the electrode surface into the electrode end side and the electrode 5A peripheral side.

When a high-frequency signal is applied from the signal source 2 to the electrode 5A via the output terminal a, an electric field is generated between the electrodes 3B and 5B and between the electrodes 4B and 5B. As shown in FIG. 5, the lines of electric force formed by this electric field are concentrated on the convex portion 8 due to the end effect of the electrodes. As a result, in the electrode 3B and the electrode 4B, an electric line of force is formed in the region defined on the peripheral side of the electrode 5A by the two convex portions 8, and an electric line of force is not formed on the electrode end side. Leakage can be suppressed.

Further, the electrode structure of the dielectric heating device 1 may be any structure other than the above structure as long as the electric field is intensively generated in the vicinity of the electrode to which the high frequency signal is applied. For example, the electrode 3 and the electrode 4 may have a shape in which only a portion in the vicinity of the electrode 5 is projected toward the electrode 5 in order to reduce the distance from the electrode 5. Even with this configuration, an electric field is locally generated in the space where the electrodes 3 and 4 face each other, so that leakage of the electric field can be suppressed.

As described above, in the dielectric heating device 1 according to the first embodiment, the electrodes 5 are arranged so as to fit in the space where the electrodes 3 and 4 face each other, and the facing area between the electrodes 3 and the electrodes 4 is large. The area facing the electrode 5 is larger than the area facing the electrode 5, and the electrode 3 and the electrode 5 and the electrode 4 and the electrode 5 function as capacitors, and the object to be heated 7 is heated by the electric field generated between the electrodes. As a result, an electric field is generated only in the vicinity of the electrode 5 in the space where the electrode 3 and the electrode 4 face each other, so that leakage of the electric field can be reduced.

In the dielectric heating device 1 according to the first embodiment, the facing area between the electrode 3 and the electrode 4 is three times or more larger than the facing area with the electrode 5. As a result, an electric field is generated only in the vicinity of the electrode 5 in the space where the electrode 3 and the electrode 4 face each other, so that leakage of the electric field can be reduced.

In the dielectric heating device 1 according to the first embodiment, the electrode 5 has a length of 1/10 or less of the wavelength of the frequency of the high frequency signal. As a result, the high frequency signal can be handled as a lumped constant between the electrodes, and the electrodes 3 and 5 and the electrodes 4 and 5 can function as capacitors.

Embodiment 2.
FIG. 6A is a top view showing the configuration of the dielectric heating device 1A according to the second embodiment. The direction indicated by the thick arrow in FIG. 6A is the direction in which the object to be heated 7 flows in the container 6A. FIG. 6B is a cross-sectional arrow diagram showing a cross section of the dielectric heating device 1A cut along the DD line of FIG. 6A. The symbol with a black circle in the circle indicates that the object to be heated 7 flows from the back side of the paper to the front side. In FIGS. 6A and 6B, the same components as those in FIGS. 1A and 1C are designated by the same reference numerals, and the description thereof will be omitted.

The dielectric heating device 1A is a device that vaporizes the object to be heated 7 by dielectric heating, and includes a signal source 2, an electrode 3, an electrode 4, an electrode 5, and a container 6A as shown in FIG. 6A. Unlike the container 6 shown in the first embodiment, the container 6A supplies the object to be heated 7 only between the electrodes 3 and 5. For example, the container 6A is a container having only a supply path of the object to be heated 7 arranged between the electrodes 3 and 5 as shown in FIG. 6A. The container 6A is fixed to the electrode side with the supply path sandwiched between the electrode 3 and the electrode 5. As the material constituting the container 6A, glass may be used, or a plurality of materials may be used.

In the dielectric heating device 1A, the electrode 3 and the electrode 5 are used for heating the object to be heated 7, but the electrode 4 and the electrode 5 are not used for heating the object to be heated 7. As a result, the volume of the object to be heated 7 with respect to the electric power obtained by applying the high frequency signal to the electrode 5 is reduced, so that the rate of temperature rise of the object to be heated 7 can be increased. Although the electrode 4 is not used for heating the object to be heated 7, it is used as a ground electrode of a capacitor. That is, when a high-frequency signal is applied to the electrode 5, electric lines of electric force are generated from the surface of the electrode 5 opposite to the electrode 3 toward the grounded electrode 4, so that leakage of the electric field is reduced.

Further, an inclusion 9 may be arranged between the electrode 4 and the electrode 5 which are not used for heating the object 7 to be heated. The inclusions 9 are members made of a material having a smaller dielectric loss than the object to be heated 7, and for example, glass may be used. As shown in FIG. 6A, the inclusions 9 may be a rectangular parallelepiped member that can be fitted between the electrodes 4 and 5.

The dielectric heating device 1A may have a configuration in which the electrodes 4 and 5 are used for heating the object to be heated 7, and the electrodes 3 and 5 are not used for heating the object to be heated 7. In this configuration, the container 6A is a container having only a supply path for the object to be heated 7 arranged between the electrode 4 and the electrode 5. Further, the inclusions 9 may be arranged between the electrodes 3 and 5.
Even with this configuration, the volume of the object to be heated 7 with respect to the electric power obtained by applying the high frequency signal to the electrode 5 is reduced, so that the rate of temperature rise of the object to be heated 7 can be increased.

In the dielectric heating device 1A, the electrode 3, the electrode 4 and the electrode 5 may be replaced with the electrodes shown in any of FIGS. 3, 4 and 5. With such a configuration, the effect described with reference to FIG. 3, the effect described with reference to FIG. 4 and the effect described with reference to FIG. 5 can be obtained.

As described above, in the dielectric heating device 1A according to the second embodiment, the container 6A has the object to be heated 7 placed between the electrode 3 and the electrode 5 and between the electrode 4 and the electrode 5. Do not supply. An inclusion 9 having a smaller dielectric loss than the object 7 to be heated is arranged between the electrodes to which the object 7 to be heated is not supplied from the container 6A. Since the volume of the object to be heated 7 is reduced with respect to the electric power obtained by applying the high frequency signal to the electrode 5, the rate of temperature rise of the object 7 to be heated can be increased.

Embodiment 3.
FIG. 7 is a top view showing the configuration of the dielectric heating device 1B according to the third embodiment. The dielectric heating device 1B shown in FIG. 7 includes absorbent cotton 10. The absorbent cotton 10 is an impregnated member impregnated with the object to be heated 7. As shown in FIG. 7, the absorbent cotton 10 impregnated with the object to be heated 7 is arranged inside the container 6. That is, the container 6 holds the object to be heated 7 via the absorbent cotton 10.

When a high-frequency signal is applied to the electrode 5, a high-frequency electric field is generated in the region C1 between the electrodes 3 and 5 and the region C2 between the electrodes 4 and 5. Cotton wool 10 impregnated with the object to be heated 7 is arranged in the regions C1 and C2, and the cotton wool 7 to be heated is heated via the cotton wool 10.

When the heated object 7 is vaporized, the object 7 impregnated in the absorbent cotton 10 arranged in the regions other than the regions C1 and C2 is transmitted to the absorbent cotton 10 arranged in the regions C1 and C2. The vaporized amount is replenished. Since the object to be heated 7 held in the container 6 is completely impregnated with the absorbent cotton 10, the dielectric heating device 1B can vaporize the object to be heated 7 without leaving any residue.

Up to now, the case where the impregnating member impregnating the object to be heated 7 is cotton wool 10 has been shown, but if the object to be heated 7 can be impregnated, an impregnating member other than cotton wool may be used.
Further, in the dielectric heating device 1B, the electrode 3, the electrode 4 and the electrode 5 may be replaced with the electrodes shown in any of FIGS. 3, 4 and 5. With such a configuration, the effect described with reference to FIG. 3, the effect described with reference to FIG. 4 and the effect described with reference to FIG. 5 can be obtained.

As described above, the dielectric heating device 1B according to the third embodiment includes cotton wool 10 impregnated with the object to be heated 7. The container 6 holds the absorbent cotton 10 impregnated with the object to be heated 7. With this configuration, the object to be heated 7 can be completely vaporized.

The present invention is not limited to the above-described embodiment, and within the scope of the present invention, any combination of the embodiments or any component of the embodiment may be modified or the embodiment. Any component can be omitted in each of the above.

Since the dielectric heating device according to the present invention can reduce electric field leakage, it can be used in various devices that generate aerosols.

1,1A, 1B dielectric heating device, 2,100 signal source, 3,3A, 3B, 4,4A, 4B, 5,5A, 101,102,103 electrodes, 6,6A container, 7 heated object, 8 convex Part, 9 inclusions, 10 cotton wool.

The dielectric heating device according to the present invention includes a signal source that generates a high-frequency signal, a grounded first electrode, a second electrode that is arranged to face the first electrode and is grounded, and a first electrode. The first electrode or the second electrode holds the third electrode connected to the signal source and the object to be heated so that the electrode and the second electrode are arranged so as to fit in the opposite space. A container for supplying an object to be heated is provided between at least one of the electrodes and the third electrode, and the facing area between the first electrode and the second electrode is larger than the facing area with the third electrode. Largely, the first electrode and the third electrode and the second electrode and the third electrode function as capacitors, and the high frequency signal from the signal source is applied to the third electrode and the electric field generated between the electrodes causes the electrode. The object to be heated is heated, and the container does not supply the object to be heated to either one of the space between the first electrode and the third electrode and the space between the second electrode and the third electrode. It is characterized in that inclusions having a smaller dielectric loss than the object to be heated are arranged between the electrodes to which the object to be heated is not supplied from the container .

Claims (10)

A signal source that produces high-frequency signals and
With the grounded first electrode,
A second electrode, which is arranged to face the first electrode and is grounded,
A third electrode, which is arranged so that the first electrode and the second electrode are opposed to each other and connected to the signal source,
A container that holds the object to be heated and supplies the object to be heated between at least one of the first electrode or the second electrode and the third electrode.
With
The facing area between the first electrode and the second electrode is larger than the facing area with the third electrode.
The first electrode, the third electrode, the second electrode, and the third electrode function as capacitors, and a high-frequency signal is applied to the third electrode from the signal source to be generated between the electrodes. A dielectric heating device characterized in that the object to be heated is heated by a generated electric field. The dielectric heating device according to claim 1, wherein the facing area between the first electrode and the second electrode is three times or more larger than the facing area with the third electrode. The dielectric heating device according to claim 1 or 2, wherein the third electrode has a length of 1/10 or less of the wavelength of a high-frequency signal. The dielectric heating device according to claim 1, wherein the third electrode is a columnar electrode. The dielectric heating device according to claim 1, wherein the first electrode and the second electrode have a bent end portion on the side of the third electrode. The dielectric heating device according to claim 1, wherein the first electrode and the second electrode have a convex portion on a surface facing the third electrode. The container is arranged between the first electrode and the third electrode and is arranged between a supply path for supplying the object to be heated and between the second electrode and the third electrode. The dielectric heating device according to claim 1, further comprising one or both of the supply paths for supplying the object to be heated. The dielectric heating device according to claim 1, wherein the container has an opening for taking out the vaporized object to be heated. The container does not supply the object to be heated to any one of the space between the first electrode and the third electrode and the space between the second electrode and the third electrode.
The dielectric heating device according to claim 1, wherein inclusions having a smaller dielectric loss than the object to be heated are arranged between the electrodes to which the object to be heated is not supplied from the container. The impregnated member impregnated with the object to be heated is provided.
The dielectric heating device according to claim 1, wherein the container holds the impregnated member impregnated with the object to be heated.

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