JP7522526B2 - Electric Field Processing Fryer - Google Patents

Description

The present invention relates to a fryer that heats and processes food using oil, and in particular to an electric field processing fryer that heats and cooks food by processing it in an electric field.

A fryer that heats and processes food using oil is comprised of an outer container made of metal or the like that functions as an external electrode and contains a heating medium such as cooking oil, and an inner container made of metal or the like that is placed inside the outer container via an insulator and functions as an internal electrode through which the heating medium such as cooking oil can pass. There are electric field processing fryers that apply high voltage AC between the external electrode and the internal electrode and heat the heating medium such as oil using a heating device such as a sheath heater to perform electric field heating and processing of food.

In an electric field processing fryer, the molecules that make up the food being processed are polarized along the direction of the electric field lines by an electric field generated by a high AC voltage, and the polarized molecules are repeatedly oriented and aligned along the direction of the electric field lines, gradually aligning the molecules in a more regular order, thereby modifying the food being processed.

The present inventors disclosed an electric field treatment fryer in WO2004/110179.
The electric field treatment heat processing device described in WO2004/110179 will be outlined below with reference to FIG.

In FIG. 1, (a) is a front cross-sectional view of a prior art electric field treatment fryer, (b) is a top cross-sectional view of the same, and (c) is a power source for generating the electric field.

In FIG. 1, reference numeral 1 denotes an external container having a rectangular parallelepiped shape with an open top and a bottom, made of a stainless steel plate or the like, in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 2 denotes an inner container having a rectangular parallelepiped shape with an open top, made of wire mesh or punched metal so that a heating medium such as cooking oil can pass through, and which functions as an inner electrode for electric field treatment.
The inner container 2 is housed inside the outer container 1 with a gap therebetween, and the outer container 1 and the inner container 2 are electrically separated by an insulator 3 .

An outer lid 4 and an inner lid 5 having a rectangular shape are provided corresponding to the outer container 1 and the inner container 2, respectively, and an insulator 3 is interposed between the outer lid 4 and the inner lid 5.
The outer lid 4 is made of a stainless steel plate or the like, similar to the outer container 1, and the inner lid 5 is made of a wire mesh or a perforated metal plate, similar to the inner container 2.
During the electric field treatment heating process, the outer lid 4 and the inner lid 5 are closed, and at that time, the outer lid 4 is electrically connected to the outer container 2 and the inner lid 5 is electrically connected to the inner container 2 .

A high voltage AC voltage, boosted to 2 to 6 kV by a transformer 8 from a commercial power source, is supplied between the external electrode 1 and the internal electrode 2 by a power supply device 7 exemplified in FIG.
A heat source 6 such as a planar sheathed heater is disposed on the outside of the bottom of the external electrode 1 .

A sheathed heater consists of a nichrome wire heater housed inside a metal pipe, which is filled with insulating powder such as magnesium oxide to electrically insulate the nichrome wire heater from the metal pipe, and both ends are sealed with insulators.

WO2004/110179 publication

Sheathed heaters have poor thermal efficiency because they use heat generated by a nichrome wire heating element to heat the heating medium by thermal conduction through magnesium oxide and metal pipes.

The sheathed heater shown in Figure 1 is housed inside the external container 1, but this makes it difficult to clean the inside of the external container 1, so the sheathed heater is sometimes placed outside the external container 1, but this further reduces the thermal efficiency.

The objective of the present invention is to obtain an electric field treatment fryer with high thermal efficiency.

To solve this problem, the invention of this application uses high-frequency induction heating to generate heat in the external or internal container, which is a magnetic material.

As a coil for high-frequency induction heating, a spiral coil or a helical coil is used.
Since the spiral coil is plate-shaped, it can be arranged in any shape that suits the shape of the location where it is to be placed.

Since the helical-shaped high-frequency induction coil is cylindrical, it is attached by wrapping it around the external or internal container that serves as the heating element.

In addition to arranging one high frequency induction coil per surface, multiple high frequency induction coils are arranged on one surface.
Of course, they can be disposed near the bottom of the outer container as in the conventional device, but in that case, the amount of heat generated by each of them will be reduced.

The containers that generate heat using high-frequency induction heating are made of magnetic material.

In high-frequency induction heating, the magnetic material placed in the high-frequency electromagnetic field generates heat itself, and the generated heat is added directly to the heating medium, improving thermal efficiency.

1A and 1B are front and top sectional views of a prior art electric field treatment fryer. 1A and 1B are a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to a first embodiment of the present invention. 2A and 2B are front and top sectional views of an electric field treatment fryer according to a second embodiment of the present invention. 3A and 3B are front and top sectional views of an electric field treatment fryer according to a third embodiment of the present invention. 4 is a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to Example 4 of the present invention. 5 is a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to a fifth embodiment of the present invention. 1 is a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to a sixth embodiment of the present invention. 7 is a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to Example 7 of the present invention. 8 is a front cross-sectional view and a top cross-sectional view of an electric field treatment fryer according to Example 8 of the present invention.

The following describes an embodiment of the invention related to this application.

FIG. 2 is a schematic diagram showing the general configuration of the electric field treatment fryer of Example 1.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, (b) is a top cross-sectional view of the same, and (c) is a power source for generating the electric field.
In this embodiment, a spiral high frequency induction heating coil is disposed on the inside bottom of the outer vessel.

In FIG. 2, reference numeral 11 denotes an external container made of magnetic stainless steel, which is a rectangular parallelepiped with an open top and a closed bottom and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 12 denotes an inner container having a rectangular parallelepiped shape with an open top, made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as edible oil can pass, and functions as an internal electrode for electric field treatment.
The inner container 12 is housed inside the outer container 11 with a gap therebetween, and the outer container 11 and the inner container 12 are electrically isolated by an insulator 13 .

An outer lid 14 and an inner lid 15 having a rectangular shape are provided for the outer container 11 and the inner container 12, respectively, and an insulator 13 is interposed between the outer lid 14 and the inner lid 15. During the heat treatment process, the outer lid 14 and the inner lid 15 are closed, and at that time, the outer lid 14 is electrically connected to the outer container 12, and the inner lid 15 is electrically connected to the inner container 12.
A high AC voltage of 2 to 6 kV is supplied between the external electrode 11 and the internal electrode 12 from a transformer 18 of a power source 16 for generating an electric field.

16 is a spiral high-frequency induction heating coil arranged inside the bottom of the external container 11, and this spiral high-frequency induction heating coil 16 is supplied with high-frequency power of 200 kHz from a high-frequency current source 17.

A high-frequency electromagnetic field is generated by the spiral high-frequency induction heating coil 16 supplied with high-frequency power, and an induced current is induced in the bottom plate of the external container 11 and the bottom plate of the external container 12, which are nearby and made of magnetic stainless steel. The induced current causes the bottom plate of the external container 11 and the bottom plate of the internal container 12 to heat up.

The heat source is the bottom plate of the external container 11 and the bottom plate of the external container 12, which are in direct contact with the heating medium such as cooking oil, resulting in high thermal efficiency and power saving.

FIG. 3 is a schematic diagram showing the general configuration of the electric field treatment fryer of Example 2.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
In this embodiment, the spiral high frequency induction heating coil is disposed outside the outer vessel.

In FIG. 3, reference numeral 11 denotes an external container made of magnetic stainless steel, which is a rectangular parallelepiped with an open top and a closed bottom and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 12 denotes an inner container having a rectangular parallelepiped shape with an open top, made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as edible oil can pass, and functions as an internal electrode for electric field treatment.
The inner container 12 is housed inside the outer container 11 with a gap therebetween, and the outer container 11 and the inner container 12 are electrically isolated by an insulator 13 .

An outer lid 14 and an inner lid 15 having a rectangular shape are provided for the outer container 11 and the inner container 12, respectively, and an insulator 13 is interposed between the outer lid 14 and the inner lid 15. During the heat treatment process, the outer lid 14 and the inner lid 15 are closed, and at that time, the outer lid 14 is electrically connected to the outer container 12, and the inner lid 15 is electrically connected to the inner container 12.
A high AC voltage of 2 to 6 kV is supplied between the outer electrode and the inner electrode from a transformer of a power source for generating an electric field.

16 is a spiral high-frequency induction heating coil arranged on the outside bottom of the outer container 11, and this spiral high-frequency induction heating coil 16 is supplied with high-frequency power of 200 kHz from a high-frequency current source 20.

When high-frequency power is supplied to the spiral high-frequency induction heating coil 16, a high-frequency electromagnetic field is generated, which induces an induced current in the bottom plate of the external container 11, which is made of a nearby magnetic material such as ferritic stainless steel, and the induced current causes the bottom plate of the external container 11 to heat up.

The spiral high-frequency induction heating coil in Example 1 is placed inside the external container 1, making it difficult to maintain the electric field heating fryer, but the spiral high-frequency induction heating coil 19 in Example 2 is placed outside the external container 1, so the thermal efficiency is somewhat reduced, but the electric field heating fryer is easy to maintain.

FIG. 4 is a schematic diagram showing the outline of the electric field treatment fryer of Example 3.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
In this embodiment, a spiral high frequency induction heating coil is disposed on the side of the outer vessel.

In FIG. 4, reference numeral 11 denotes an external container made of magnetic stainless steel, which is a rectangular parallelepiped with an open top and a closed bottom and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 12 denotes an inner container having a rectangular parallelepiped shape with an open top, made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for electric field treatment.
The inner container 12 is housed inside the outer container 11 with a gap therebetween, and the outer container 11 and the inner container 12 are electrically isolated by an insulator 13 .

An outer lid 14 and an inner lid 15 having a rectangular shape are provided for the outer container 11 and the inner container 12, respectively, and an insulator 13 is interposed between the outer lid 14 and the inner lid 15. During the heat treatment process, the outer lid 14 and the inner lid 15 are closed, and at that time, the outer lid 14 is electrically connected to the outer container 12, and the inner lid 15 is electrically connected to the inner container 12.
A high AC voltage of 2 to 6 kV is supplied between the outer electrode and the inner electrode from a transformer of a power source for generating an electric field.

21a, 21b, 21c, and 21d are spiral high-frequency induction heating coils arranged on the outer side of the outer container 11, and high-frequency power of 200 kHz is supplied to these spiral high-frequency induction heating coils 21a, 21b, 21c, and 21d from the high-frequency current source 20.

A high-frequency electromagnetic field is generated by the spiral high-frequency induction heating coils 21a, 21b, 21c, and 21d supplied with high-frequency power, and an induced current is induced in the side panel of the external container 11, which is made of a nearby magnetic material such as ferritic stainless steel, and the induced current causes the side panel of the external container 11 to heat up.

The spiral high-frequency induction heating coil of Example 3 is placed on the side of the external container 11, so heating is performed effectively.

The spiral high-frequency induction heating coils 21a, 21b, 21c, and 21d can also be placed between the outer container 11 and the inner container 12. Although this arrangement requires more effort to maintain the electric field heating fryer, heating is more effective because the inner container 12 also becomes a heating element.

In order to perform heating more effectively, it is also possible to place a spiral high-frequency induction heating coil on the inside of the bottom of the external container 11 as in Example 1, or between the bottom of the external container 11 and the internal container 12 as in Example 2.

FIG. 5 is a schematic diagram showing the outline of the electric field treatment fryer of Example 4.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
In this embodiment, a plurality of spiral high frequency induction heating coils are disposed on each side of the outer vessel.

In FIG. 5, reference numeral 11 denotes an external container made of magnetic stainless steel, which is a rectangular parallelepiped with an open top and a closed bottom and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 12 denotes an inner container having a rectangular parallelepiped shape with an open top, made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for electric field treatment.
The inner container 12 is housed inside the outer container 11 with a gap therebetween, and the outer container 11 and the inner container 12 are electrically isolated by an insulator 13 .

An outer lid 14 and an inner lid 15 having a rectangular shape are provided for the outer container 11 and the inner container 12, respectively, and an insulator 13 is interposed between the outer lid 14 and the inner lid 15. During the heat treatment process, the outer lid 14 and the inner lid 15 are closed, and at that time, the outer lid 14 is electrically connected to the outer container 12, and the inner lid 15 is electrically connected to the inner container 12.
A high AC voltage of 2 to 6 kV is supplied between the outer electrode and the inner electrode from a transformer of a power source for generating an electric field.

19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h are spiral high-frequency induction heating coils arranged on the outer side of the outer container 11, and these spiral high-frequency induction heating coils 19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h are supplied with high-frequency power of 200 kHz from a high-frequency current source 20 (not shown).

A high-frequency electromagnetic field is generated by the spiral high-frequency induction heating coils 19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h that are supplied with high-frequency power, and an induced current is induced in the side panel of the nearby external container 11, which is made of magnetic stainless steel, and the induced current causes the side panel of the external container 11 to heat up.

Since the spiral high-frequency induction heating coil of the third embodiment is disposed on the side surface of the outer vessel 11, heating can be performed effectively.
Furthermore, uneven heating can be prevented by individually controlling the high frequency power supplied to the multiple spiral high frequency induction heating coils.

The spiral high-frequency induction heating coils 19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h can also be placed between the outer container 11 and the inner container 12. Although this arrangement makes it more difficult to maintain the electric field heating fryer, heating is more effective because the inner container 12 also becomes a heating element.

In order to perform heating more effectively, it is also possible to place a spiral high-frequency induction heating coil on the inside of the bottom of the external container 11 as in Example 1, or between the bottom of the external container 11 and the internal container 12 as in Example 2.

FIG. 6 is a schematic diagram showing the outline of the electric field treatment fryer of Example 5.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
The outer container and the inner container are cylindrical with a bottom, and the outer lid and the inner lid are circular.
In this embodiment, a spiral high frequency induction heating coil is disposed on the side of the outer vessel.

In FIG. 6, reference numeral 21 denotes an external container made of magnetic stainless steel, which has a cylindrical shape with an open top and a bottom, and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 22 denotes an inner container having a cylindrical shape with an open top and made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for the electric field treatment.
The cylindrical inner container 22 is accommodated inside the cylindrical outer container 21 with a gap therebetween, and the cylindrical outer container 21 and the cylindrical inner container 22 are electrically isolated by an insulator 23 .

A circular outer lid 24 and an inner lid 25 are provided for the cylindrical outer container 21 and the cylindrical inner container 22, respectively, and an insulator 23 is interposed between the outer lid 24 and the inner lid 25. During heat treatment, the outer lid 24 and the inner lid 25 are closed, and at that time, the outer lid 24 is electrically connected to the cylindrical outer container 22, and the inner lid 25 is electrically connected to the cylindrical inner container 22.
A high AC voltage of 2 to 6 kV is supplied between the external electrode and the internal electrode from an electric field generating power source 17 .

36a and 36b are semi-cylindrical spiral high-frequency induction heating coils arranged on the outer side of the cylindrical outer container 21, and high-frequency power of 200 kHz is supplied to these spiral high-frequency induction heating coils 36a and 36b from the high-frequency current source 20.

A high-frequency electromagnetic field is generated by the semi-cylindrical spiral high-frequency induction heating coils 36a, 36b supplied with high-frequency power, and an induced current is induced in the side panel of the nearby cylindrical external container 21 made of a magnetic material such as magnetic stainless steel, and the induced current causes the side panel of the cylindrical external container 21 to heat up.

The spiral high-frequency induction heating coil of Example 5 is placed on the side of the cylindrical outer container 21, so heating is performed effectively.

The spiral high-frequency induction heating coils 36a, 36b can also be placed between the cylindrical outer container 21 and the cylindrical inner container 22. Although this arrangement makes it more difficult to maintain the electric field heating fryer, heating is more effective because the cylindrical inner container 22 also serves as a heating element.

In order to perform heating more effectively, the spiral high-frequency induction heating coil can be placed inside the bottom of the bottomed cylindrical outer container 21 as in Example 1, or between the bottom of the bottomed cylindrical outer container 21 and the bottomed cylindrical inner container 22 as in Example 2.

FIG. 7 is a schematic diagram showing the general configuration of the electric field treatment fryer of Example 6.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
The outer container and the inner container are cylindrical with a bottom as in Example 5, and the outer lid and the inner lid are circular.
In this embodiment, a plurality of, for example, 12 spiral high-frequency induction heating coils are arranged on the side surface of the outer container.

In FIG. 7, reference numeral 31 denotes an external container made of magnetic stainless steel, which has a cylindrical shape with an open top and a bottom, and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 22 denotes an inner container having a cylindrical shape with an open top and made of a magnetic stainless steel wire mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for the electric field treatment.
The cylindrical inner container 22 is accommodated inside the cylindrical outer container 21 with a gap therebetween, and the cylindrical outer container 21 and the cylindrical inner container 22 are electrically isolated by an insulator 23 .

A circular outer lid 24 and an inner lid 25 are provided for the cylindrical outer container 21 and the cylindrical inner container 22, respectively, and an insulator 23 is interposed between the outer lid 24 and the inner lid 25. During heat treatment, the outer lid 24 and the inner lid 25 are closed, and at that time, the outer lid 24 is electrically connected to the cylindrical outer container 22, and the inner lid 25 is electrically connected to the cylindrical inner container 22.
A high AC voltage of 2 to 6 kV is supplied between the external electrode and the internal electrode from an electric field generating power source (not shown).

37a, 37b, 37c, 37d, 37e, 37f, 37g, 37h, 37i, 37j, 37k, and 37l are 12-part cylindrical spiral high-frequency induction heating coils arranged on the outer side of the cylindrical outer container 31, and these spiral high-frequency induction heating coils 37a, 37b, 37c, 37d, 37e, 37f, 37g, 37h, 37i, 37j, 37k, and 37l are supplied with 200 kHz high-frequency power from a high-frequency current source (not shown).

A high-frequency electromagnetic field is generated by the spiral high-frequency induction heating coils 37a, 37b, 37c, 37d, 37e, 37f, 37g, 37h, 37i, 37j, 37k, and 37l supplied with high-frequency power, and an induced current is induced in the side panel of the nearby cylindrical external container 21 made of a magnetic material such as magnetic stainless steel, and the induced current causes the side panel of the cylindrical external container 21 to heat up.

The spiral high-frequency induction heating coils 37a, 37b, 37c, 37d, 37e, 37f, 37g, 37h, 37i, 37j, 37k, and 37l of Example 6 are arranged on the side of the cylindrical outer container 11, so that heating is performed effectively.

The spiral high-frequency induction heating coils 37a, 37b, 37c, 37d, 37e, 37f, 37g, 37h, 37i, 37j, 37k, and 37l can also be arranged between the cylindrical outer container 21 and the cylindrical inner container 22. Although this arrangement makes it more difficult to maintain the electric field heating fryer, heating is more effective because the cylindrical inner container 22 also serves as a heating element.

In order to perform heating more effectively, the spiral high-frequency induction heating coil can be placed inside the bottom of the bottomed cylindrical outer container 21 as in Example 1, or between the bottom of the bottomed cylindrical outer container 21 and the bottomed cylindrical inner container 22 as in Example 2.

FIG. 8 is a schematic diagram showing the outline of the electric field treatment fryer of Example 7.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
The outer container and the inner container are cylindrical with a bottom as in the case of the fifth and sixth embodiments, and the outer lid and the inner lid are circular.
The high frequency induction heating coil has a helical shape, unlike the spiral shape of the first to sixth embodiments.

In FIG. 8, reference numeral 21 denotes an external container having a cylindrical shape with an open top and a bottom, made of a magnetic material such as magnetic stainless steel, in which a heating medium such as edible oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 22 denotes an inner container having a cylindrical shape with an open top and made of a magnetic stainless steel wire mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for the electric field treatment.
The cylindrical inner container 22 is accommodated inside the cylindrical outer container 21 with a gap therebetween, and the cylindrical outer container 21 and the cylindrical inner container 22 are electrically isolated by an insulator 23 .

A circular outer lid 24 and an inner lid 25 are provided for the cylindrical outer container 21 and the cylindrical inner container 22, respectively, and an insulator 23 is interposed between the outer lid 24 and the inner lid 25. During heat treatment, the outer lid 24 and the inner lid 25 are closed, and at that time, the outer lid 24 is electrically connected to the cylindrical outer container 22, and the inner lid 25 is electrically connected to the cylindrical inner container 22.
A high AC voltage of 2 to 6 kV is supplied between the external electrode and the internal electrode from a transformer (not shown) of the electric field generating power source 17 .

38 is a cylindrical helical high-frequency induction heating coil tightly wound around the outer side of the cylindrical outer container 21, and high-frequency power of 200 kHz is supplied to this helical high-frequency induction heating coil 38 from the high-frequency current source 20.

A high-frequency electromagnetic field is generated by the helical high-frequency induction heating coil 38 supplied with high-frequency power, and an induced current is induced in the cylindrical external container 21 made of a magnetic material such as magnetic stainless steel, and the induced current causes the side panel of the cylindrical external container 21 to heat up.

The helical high-frequency induction heating coil of Example 7 is wound tightly around the cylindrical outer container 21, so that the magnetic flux is concentrated in the cylindrical outer container 21, and heating is performed effectively.

The helical high-frequency induction heating coil can also be placed between the cylindrical outer container 21 and the cylindrical inner container 22. Although this arrangement requires more effort to maintain the electric field heating fryer, heating is more effective because the cylindrical inner container 22 also serves as a heating element.

In order to perform heating more effectively, it is also possible to place a spiral high-frequency induction heating coil on the inside of the bottom of the bottomed cylindrical outer container 21 as in Example 1, or between the bottom of the bottomed cylindrical outer container 21 and the bottomed cylindrical inner container 22 as in Example 2.

FIG. 9 is a schematic diagram showing the outline of the electric field treatment fryer of Example 8.
In this figure, (a) is a front cross-sectional view of the electric field treatment fryer, and (b) is a top cross-sectional view of the same.
Example 8 is an improvement of Example 7.
The power source for generating the electric field is the same as that in the first embodiment, and therefore the explanation is omitted.
The outer container and the inner container are cylindrical with a bottom as in the case of the fifth to seventh embodiments, and the outer lid and the inner lid are circular.
The high frequency induction heating coil has a helical (spiral) shape as in the seventh embodiment, but a plurality of coils are used.

In FIG. 8, reference numeral 21 denotes an external container made of magnetic stainless steel, which has a cylindrical shape with an open top and a bottom, and in which a heating medium such as cooking oil is contained, and which functions as an external electrode for electric field treatment.
Reference numeral 22 denotes an inner container having a cylindrical shape with an open top and made of a magnetic stainless steel mesh or a magnetic stainless steel punched metal through which a heating medium such as cooking oil can pass, and functions as an internal electrode for the electric field treatment.
The cylindrical inner container 22 is accommodated inside the cylindrical outer container 21 with a gap therebetween, and the cylindrical outer container 21 and the cylindrical inner container 22 are electrically isolated by an insulator 23 .

A circular outer lid 24 and an inner lid 25 are provided for the cylindrical outer container 21 and the cylindrical inner container 22, respectively, and an insulator 23 is interposed between the outer lid 24 and the inner lid 25. During heat treatment, the outer lid 24 and the inner lid 25 are closed, and at that time, the outer lid 24 is electrically connected to the cylindrical outer container 22, and the inner lid 25 is electrically connected to the cylindrical inner container 22.
A high AC voltage of 2 to 6 kV is supplied between the external electrode and the internal electrode from an electric field generating power source (not shown).

39a, 39b, and 39c are multiple cylindrical helical high-frequency induction heating coils tightly wound around the outer side surface of the cylindrical outer container 21, and high-frequency power of 200 kHz is supplied to the helical high-frequency induction heating coils 39a, 39b, and 39c from a high-frequency current source (not shown).

A high-frequency electromagnetic field is generated by the helical high-frequency induction heating coils 39a, 39b, and 39c supplied with high-frequency power, and an induced current is induced in the cylindrical external container 21 made of a magnetic material such as magnetic stainless steel, and the induced induced current causes the cylindrical external container 21 to heat up.

In Example 8, multiple helical high-frequency induction heating coils are wound around the cylindrical outer container 21, so the high-frequency current supplied to each coil can be controlled.

The helical high-frequency induction heating coil can also be placed between the cylindrical outer container 21 and the cylindrical inner container 22. Although this arrangement requires more effort to maintain the electric field heating fryer, heating is more effective because the cylindrical inner container 22 also serves as a heating element.

In order to perform heating more effectively, it is also possible to place a spiral high-frequency induction heating coil on the inside of the bottom of the bottomed cylindrical outer container 21 as in Example 1, or between the bottom of the bottomed cylindrical outer container 21 and the bottomed cylindrical inner container 32 as in Example 2.

The electric field treatment fryer of the present invention achieves good heating effect and energy savings because the container itself generates heat through electromagnetic induction in addition to the electric field treatment.

1, 11, 21 Outer container 2, 12, 19 Inner container 3, 13, 23 Insulator 4, 14, 24 Outer lid 5, 15, 25 Inner lid 6 Sheathed heater 7, 17 Electric field generating power source 16, 19, 21a to 21d, 19a to 19h, 38a, 38b, 37a to 37
20 Electromagnetic induction heating power supply 16, 16a to 16d, 17a to 17h, 38a, 38b, 39a to 39l Electromagnetic induction heating coil

Claims (3)

a metal outer container that is impermeable to the heating medium contained therein;
a metal inner container that is permeable to a heating medium and is accommodated in the metal outer container;
an insulator interposed between the metal outer container and the metal inner container to electrically insulate the metal outer container from the metal inner container;
a power source for applying a high AC voltage between the outer metal container and the inner metal container;
a heat source for heating a heating medium contained in the metal outer container;
An electric field treatment fryer that heats and processes food placed in a heating medium contained in the metal outer container,
The electric field treatment fryer is characterized in that the heat source is an electromagnetic induction heating coil arranged between all sides of the outer metal container and all sides of the inner metal container and has a shape that fits the outer metal container and the inner metal container . 2. The electric field treatment fryer according to claim 1, wherein the electromagnetic induction heating coil is a spiral coil . 2. The electric field treatment fryer according to claim 1, wherein the electromagnetic induction heating coil is a helical coil .

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