JP2010017481A - Fryer and method of preventing impurities from adhering to fryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water circulation fryer with an oil layer and a water layer, which is equipped with a circulation pipe attracting water to the outside of a storage tank from the water layer and again returning it to the water layer from the side wall of the storage tank, and horizontally rotates the water layer and the oil layer in a whirl form, wherein impurities are prevented from adhering to the inner wall of the storage tank and the inside of the circulation pipe and the adhered impurities can be removed. <P>SOLUTION: An electromagnetic field is caused to act on water which flows through the circulation pipe by impressing an alternating current voltage to a coil wound around a part of the circulation pipe. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a fryer having an oil layer and a water layer in two upper and lower layers in a storage tank, and having a circulation pipe for sucking water from the storage tank and returning it back to the water layer. The present invention relates to a fryer capable of preventing impurities such as debris, altered oil, and metal ions in water from adhering to the inner wall of the storage tank and the circulation pipe.

  A conventional fryer has an oil layer and an aqueous layer in the upper and lower layers in the storage tank, the oil layer and the water layer are in contact with each other at the boundary surface, and the oil layer is heated by a heater provided in the middle part of the oil layer. There was what fried food cooking (patent document 1). In such a fryer, the frying residue etc. which generate | occur | produce in deep-fried food cooking are submerged and isolate | separated into an aqueous layer, and it can maintain the cleanliness of oil.

Patent Document 2 further includes a circulation pipe that sucks water from the water layer to the outside of the storage tank and returns the water layer to the water layer again from a supply port provided in the storage tank side wall in a fryer having an oil layer and a water layer. And an oil layer that can be rotated horizontally in a spiral.
In such a fryer, the contact between the oil and the heater surface is increased by the horizontal rotation of the oil layer, and the heat exchange efficiency can be increased. In addition, the oil is engulfed in water at the boundary of the oil water, so that not only the fried residue, but also the water that flows out of the food, water-soluble oxides generated by the hydrolysis and thermal oxidation of the oil, etc. are transferred to the water layer, Deterioration of cooking oil can be greatly suppressed.

Japanese Patent Publication No.55-40249 International Publication No. 2007/116882 Pamphlet

In the water circulation flyer shown in Patent Document 2, the oil layer and the rotation of the water layer and the water circulation are used to prevent cooking oil from deteriorating and maintain the cleanliness of the oil so that it can withstand long-term use. However, over time, the inner walls of the storage tank and the circulation pipe will adhere to impurities such as fine fried residue, oxides, metal ions, etc. contained in the water flowing inside, and clog the pipes and bacteria. There were cases where hygiene problems such as breeding occurred.
For this reason, in the said fryer, it was necessary to clean the inside of a storage tank and the inside of a pipe after the completion of cooking once every several days. In particular, the circulation pipe was a thin and bent pipe, which was troublesome.

  The present invention has been made to solve the above problems, and provides a water circulation fryer that can prevent impurities from adhering to the inner wall of the storage tank and the circulation pipe, or can remove the adhering impurities. Let it be an issue.

In the present invention, means for solving the above problems are as follows.
A first aspect of the present invention is a storage tank that stores a cooking oil layer and a water layer in contact with a boundary surface in two upper and lower layers, a heater disposed in the oil layer, and sucks water in the storage tank from a water inlet. A fryer having a circulation pipe returning from the supply port to the water layer, and applying an AC voltage to a coil wound around a part of the circulation pipe to act an electromagnetic field on the water flowing in the circulation pipe It is characterized by making it.

  According to a second aspect of the present invention, in the first aspect of the present invention, a filtration water tank is provided in the path of the circulation pipe to remove fried residue etc. by a filter included therein, and the filtration water tank is disposed in front of the filtration water tank of the circulation pipe. A water supply pipe capable of supplying new water is connected, and the coil is wound between the circulating pipe and the connection portion of the water supply pipe and the filtered water tank.

  3rd invention has a storage tank which stores in two upper and lower layers the oil layer for cooking, and the water layer which touches a boundary, and the heater arrange | positioned in this oil layer, The water of the said water layer is swirled The flyer is horizontally rotated, and an AC voltage is applied to a coil disposed in the water layer in the storage tank so that an electromagnetic field acts on the water in the water layer.

  According to a fourth aspect of the present invention, there is provided a storage tank for storing an oil layer for cooking and a water layer in contact with the boundary layer in two layers, a heater disposed in the oil layer, and water in the water layer is sucked from the storage tank. A frying pipe having a circulation pipe that returns to the water layer again, and an electrolytic water tank for temporarily retaining water in the path of the circulation pipe is provided, and an AC voltage is applied in the electrolytic water tank. A second electrode and a third electrode that is arranged between these electrodes and grounded are provided, and a direct current is passed from the first and second electrodes to the third electrode.

  According to a fifth aspect of the present invention, there is provided a storage tank for storing a cooking oil layer and a water layer in contact with the boundary surface in two layers, a heater disposed in the oil layer, and water in the storage tank is sucked from a water inlet. A method for preventing impurities from adhering in a circulation pipe of a fryer having a circulation pipe returning from the supply port to the water layer, the method including the step of applying an electromagnetic field to a part of the circulation pipe. Acts on the water flowing through the circulation pipe.

According to the first aspect of the present invention, an alternating voltage is applied to a coil wound around a part of the circulation pipe, and an electromagnetic field is applied to the water flowing in the circulation pipe, whereby the Lorentz force is applied to the water flowing inside the coil. The water molecules, ions, electrons, etc. contained in the water collide with impurities attached to the inner wall of the circulation pipe.
Thereby, both the adhered impurities and the inner wall of the circulation pipe are negatively charged, and the impurities are separated from the inner wall of the circulation pipe by repelling the impurities and the inner wall of the circulation pipe. Moreover, at this time, electrons are supplied to oxides generated by hydrolysis or thermal oxidation of oil and deposited metal ions (elements), and the oil is returned to a low viscosity state by reduction or electrolysis, The ions are eluted and separated from the circulation pipe.

In this way, impurities contained in the water flowing in the circulation pipe can be prevented from adhering to the inner wall of the circulation pipe, and impurities adhering to the inner wall of the circulation pipe can be separated and removed.
In addition, since the charged state of water molecules and ions generated by the magnetic field lasts for a certain period of time, the above effect can be obtained not only in the section where the coil is wound but also in the downstream circulation pipe and storage tank.

  Moreover, in the water magnetized in this way, the water molecules are also negatively charged, so they repel each other and the clusters are subdivided. This makes it easier for water to dissolve the solute, so that impurities can be easily separated from the oil layer and absorbed in the water layer when the oil is washed by horizontal rotation of the water layer, and the purification ability can be further enhanced.

  According to the second invention, a water supply pipe capable of supplying new water to the filtered water tank is connected to the front side of the filtered water tank of the circulation pipe, and the coil is interposed between the circulating pipe and the connecting portion of the water supply pipe and the filtered water tank. Since the new water supplied from the water supply pipe is first magnetized and then circulates in the fryer, the water in the fryer can be kept magnetized at any time.

  According to the third aspect of the invention, by applying an AC voltage to the coil disposed in the water layer in the storage tank and causing the electromagnetic field to act on the water in the water layer, the flowing water receives the Lorentz force from the electromagnetic field. In addition, the separation, reduction, and electrolysis of impurities can be effectively realized.

According to 4th invention, the electrolyzed water tank which retains water temporarily in the path | route of a circulation pipe is provided, the 1st and 2nd electrode to which an alternating voltage is applied in an electrolyzed water tank, and these electrodes A third electrode disposed in the middle and grounded, and by passing a direct current from the first and second electrodes to the third electrode, water is electrolyzed to generate oxygen and hydrogen bubbles, As water dissolves into water in a supersaturated state, the redox potential of water decreases and becomes a reduction potential. At this time, of the impurities contained in the water, the oil that has deteriorated due to oxidation or polymerization and has become highly viscous is reduced and returned to a low viscosity state, preventing the altered oil from adhering to the circulation pipe. can do.
Further, since metal such as calcium is ionized and easily dissolved in water, it is possible to prevent the metal from adhering to the circulation pipe. In addition, it is effective in preventing bacterial growth and sterilization.

According to the fifth aspect of the present invention, the method includes the step of applying an electromagnetic field to a part of the circulation pipe, and the electromagnetic field acts on the water flowing through the circulation pipe, whereby the Lorentz force acts on the water flowing inside the coil. Collides with impurities attached to water molecules, ions, electrons, etc.
Thereby, both the adhering impurities and the inner wall of the circulation pipe are negatively charged, and the impurities are separated from the inner wall of the circulation pipe by repelling the impurities and the inner wall of the circulation pipe. Moreover, at this time, electrons are supplied to oxides generated by hydrolysis or thermal oxidation of oil and deposited metal ions (elements), and the oil is returned to a low viscosity state by reduction or electrolysis, The ions are eluted and separated from the circulation pipe.

Hereinafter, the water circulation fryer which concerns on embodiment of this invention is demonstrated.
As shown in FIG. 1, the water circulation flyer has a storage tank 1 that is formed in a rectangular cylinder shape with an upper portion being a square cylinder and a lower portion protruding downward, and having a water inlet 1 a at the bottom.
In this storage tank 1, an oil layer 2 for frying food and a water layer 3 for purifying oil by taking in the fried residue in the oil below the oil layer can be stored in two upper and lower layers.

A heater 4 for heating oil is provided in the oil layer of the storage tank 1.
The heater 4 is arranged at substantially the center of the oil layer 2, and when the heater 4 is heated, two layers of the oil high temperature portion 2 a and the oil low temperature portion 2 b are formed with a boundary slightly below the position of the heater 4. .
As a result, in the storage tank 1, three layers of a water layer 3, an oil low temperature portion 2b, and an oil high temperature portion 2a are formed in order from the bottom.

In the oil high temperature part 2a, the foodstuff put on the basket shape | molded with the metal net etc. is thrown in, and it is fried at predetermined temperature.
The oil low temperature part 2b serves as a temperature buffer part between the oil high temperature part 2a and the water layer 3, and also adjusts the oil temperature of the oil high temperature part 2a, and also serves as a supply source of new undegraded oil.
The water layer 3 plays a role of a sedimentation layer that precipitates and collects impurities such as deep-fried dregs that are generated during cooking of fried foods, and rotates the water horizontally to wash the oil and circulates the water. It plays a role such as temperature adjustment of the oil layer 2.

Water in the water layer 3 is sucked by the pump 5 together with impurities from the water inlet 1a at the bottom of the storage tank 1, flows into the filtered water tank 7 through the circulation pipe 6, and is filtered by the filter 7a provided in the filtered water tank 7. Then, the purified water is returned from the filtered water tank 7 to the storage tank 1 through the supply port 1c. The location where the pump 5 is disposed in the circulation pipe 6 is preferably in the section from the outlet of the filtered water tank 7 to the front before flowing into the storage tank 1. This is because the water from which the fried debris and fine debris have been removed flows in the filtered water tank 7, so that there is no possibility that the debris and debris will adhere to or catch on the pump 5.
A drain pipe for discharging water branches off from the circulation pipe 6, and a shut-off valve 1b that can be opened and closed is provided in the drain pipe.

  The filtered water tank 7 has a filter 7a disposed horizontally in the center of the height, and is configured such that water flows in from the lower inlet, passes through the filter 7a, and flows out from the upper outlet. . The fried debris crushed by the filter 7a drops and settles at the bottom of the filtered water tank, so that the filter 7a is less likely to be clogged and can be removed efficiently.

When the purified water is returned to the storage tank 1, it is discharged in a substantially horizontal direction along the adjacent side wall from the supply port 1c provided in the side wall on the back side of the water layer 3 in the storage tank 1, The water layer 3 is rotated horizontally in a spiral.
As the water layer 3 rotates, the oil low temperature part 2b located immediately above the water layer 3 starts to turn around with a slight delay, and the oil high temperature part 2a above the oil low temperature part 2b starts to turn around with a further delay.

  The horizontal rotation of the oil layer 2 increases the contact between the oil and the surface of the heater 4 to increase the heat exchange efficiency. Furthermore, when oil is sunk in water at the boundary between oil and water, not only deep-fried debris but also water flowing out from foods, water-soluble oxides generated by oil hydrolysis and thermal oxidation, etc. are transferred to the water layer 3. The deterioration of cooking oil can be greatly suppressed. Moreover, by filtering and circulating the water, it is possible to remove the fried residue from the storage tank 1 and collect it, and to keep the water layer 3 in the storage tank 1 clean.

  Further, an impurity removing pipe 12a communicates with the bottom of the filtered water tank 7 so that the frying waste collected at the lower part of the filtered water tank 7 (upstream side of the filter 7a) can be discarded to the outside. Further, the water supply pipe 12b connected to the water supply is connected to the circulation pipe 6 in the vicinity of the inlet of the filtered water tank 7, so that new tap water can be supplied after disposal of the frying waste and the like.

In order to remove impurities and replace water, first, the pump 5 is stopped after cooking, so that the water in the storage tank 1 does not flow into the circulation pipe 6.
Next, a valve (not shown) provided in the impurity removal pipe 12a is opened, and the fried residue and the like accumulated in the filtered water tank 7 are discharged together with water. At the outlet of the impurity removal pipe 12a, a collection container (not shown) provided with a mesh basket having a mesh similar to that of the filter 7a is arranged so that the fried residue etc. can be collected and drained after being drained. Is desirable.
Then, after closing the valve of the impurity removal pipe 12a, new tap water is supplied from the water supply pipe 12b to the filtered water tank 7, and when a sufficient amount of water is supplied, the circulation of water is resumed.

Thereby, even if it does not change the water level in the storage tank 1, or removes the filtration water tank 7, the washing | cleaning in the filtration water tank 7 and water replacement | exchange can be performed.
In addition to being connected near the inlet of the filtered water tank 7 of the circulating pipe 6, the water pipe 12 b is connected so as to flow backward from the circulating pipe 6 near the outlet of the filtered water tank 7 to the filtered water tank 7 side. Along with this, the fried residue stuck to the filter 7a may be washed away.
In addition, if necessary, a water level sensor is installed in the filtered water tank 7, or a flow rate sensor is provided in the impurity removing pipe 12a and the water supply pipe 12b. You may provide the control apparatus which performs this automatically.

In this water circulation flyer, a magnetic field generator 9 is attached in the path of the circulation pipe 6 between the junction with the water supply pipe 12b and the inlet of the filtered water tank.
The magnetic field generator 9 includes a cylindrical body 9a that covers the outer surface of the circulation pipe 6, a coil 9b wound around the cylindrical body 9a, and a signal generator 9c that is connected to both ends of the coil 9b and gives a signal to the coil 9b. It consists of.

The cylindrical body 9a is formed of a non-magnetic non-ferrous material such as plastic, and polyvinyl chloride is desirable. The cylindrical body 9a can be fixed at a predetermined position of the circulation pipe 6 by providing a screw for clamping at both axial ends of the cylindrical body 9a.
A coil 9b is formed by winding an electric wire around the cylindrical body 9a a plurality of times. As this electric wire, stainless steel is desirable.
The signal generator 9c is supplied with electric power from a power source, and generates an electric field and a magnetic field by causing a current set by an internal current control unit to flow through the coil. The current flowing through the coil 9b is preferably an alternating square wave, and the frequency can be arbitrarily set, for example, between 50 Hz and 10 kHz according to the type of impurities.
While setting the frequency and operating the magnetic field generator 9, it is desirable to increase or decrease the frequency within a predetermined range from the set frequency.

When the magnetic field generator 9 is connected to a power source and a current is passed through the coil 9b while the water is circulated using the pump 5, an electromagnetic field is induced in the coil 9b. When an electric charge moves in a magnetic field, the electric charge receives a force (Lorentz force) perpendicular to the direction of movement. Therefore, water molecules, ions, electrons, etc. contained in the water flowing in the circulation pipe 6 receive Lorentz force from this magnetic field and collide with impurities attached to the inner wall of the circulation pipe.
As a result, the adhered impurities and the inner wall of the circulation pipe are negatively charged, and the impurities are separated from the inner wall of the circulation pipe 6 by repelling the impurities and the inner wall of the circulation pipe 6. Moreover, at this time, electrons are supplied to oxides generated by hydrolysis or thermal oxidation of oil and deposited metal ions (elements), and the oil is returned to a low viscosity state by reduction or electrolysis, Ions are eluted and separated from the circulation pipe 6.

In this way, impurities contained in the water flowing in the circulation pipe 6 can be prevented from adhering to the inner wall of the circulation pipe 6, and impurities adhering to the inner wall of the circulation pipe 6 can be separated and removed.
In addition, since the charged state of water molecules and ions generated by the magnetic field lasts for a certain period of time, the above effect can be obtained not only in the section where the coil 9b is wound, but also in the entire area of the downstream circulation pipe 6 and the storage tank 1.

By attaching the magnetic field generator 9 between the junction with the water supply pipe 12b and the inlet of the filtered water tank in the path of the circulation pipe 6, new water is first magnetized immediately after the water is replaced. Since the water circulation flyer is circulated, the water in the fryer can be kept magnetized at any time.
In order to achieve the same effect, the magnetic field generator 9 may be separately attached to the other part of the circulation pipe 6 and the water supply pipe 12b.

  In addition, since the water magnetized in this way is also negatively charged with water molecules, they repel each other and the clusters are subdivided. This makes it easier for water to dissolve the solute, so that impurities can be separated from the oil layer 2 and easily absorbed by the water layer 3 when the oil is washed by horizontal rotation of the water layer 3, and the purification ability can be further enhanced.

By forming the coil 9b from stainless steel having a larger electric resistance than the copper wire, the magnetic field obtained is close to a square wave, and the response to an alternating current is excellent.
By increasing or decreasing the frequency within a predetermined range from the set frequency, even if the set frequency deviates from the frequency according to the type of impurities due to various conditions such as temperature, the desired frequency is within the range of the increased or decreased frequency. Can be included.

Second Embodiment
In the water circulation flyer, a plurality of coils 10 b are arranged at the bottom of the water layer 3 in the storage tank 1.
The coil 10b is placed vertically so that its axis is directed in the vertical direction, and both ends thereof are connected to the wiring from the signal generator 10c that provides an AC signal.

  When an alternating current is passed through the coil 10b in the water layer 3 like the coil 9b of the circulation pipe 6, an electromagnetic field is induced in and around the coil 10b. In the magnetic field generated at this time, a strong magnetic flux is generated in the same direction as the axis of the coil 10b and in the opposite direction. Therefore, when the coil 10b is arranged vertically, upward and downward magnetic fluxes are generated.

When the coil 10b is arranged in the water layer 3 in this way, in addition to the magnetic flux generated inside the coil 10b, the magnetic flux generated around the coil 10b can also act on the water, thereby preventing the adhesion of impurities. Can be realized.
In addition, when the coil 10b is installed in the water layer 3 of the water circulation flyer, the water in the water layer 3 is forcibly horizontally rotated, so that a large Lorentz force works in proportion to the rotation speed of the water, The effect of preventing the adhesion of impurities is also improved.

The Lorentz force received by the charge moving in the magnetic field becomes maximum when the direction of the magnetic flux and the direction of movement of the charge intersect perpendicularly. That is, when the axis of the coil 10b and the rotation of water intersect perpendicularly, the Lorentz force received by water is maximized.
When the water is circulated using the pump 5, the water in the water layer 3 is rotated in the horizontal direction, so that the magnetic flux directed vertically and the water flowing in the horizontal direction intersect perpendicularly inside and around the coil 10b.
Thereby, the Lorentz force can be efficiently applied to water molecules, ions, electrons, etc. contained in the water rotating in the storage tank 1, and the separation, reduction, and electrolysis of impurities can be effectively realized. .

In addition, since the water magnetized in this way is also negatively charged with water molecules, they repel each other and the clusters are subdivided. This makes it easier for water to dissolve the solute, so that impurities can be separated from the oil layer 2 and easily absorbed by the water layer 3 when the oil is washed by horizontal rotation of the water layer 3, and the purification ability can be further enhanced.
At this time, the charged state of water molecules and ions generated by the action of the electromagnetic field continues for a certain period of time, so that it is possible to prevent or remove impurities while flowing in the downstream circulation pipe 6. it can.

  In the above embodiment, the coil 10b is arranged vertically in the storage tank 1, but it may be arranged so that the axis of the coil 10b coincides with a straight line passing through the center of the storage tank, that is, in the radial direction. Also in this case, the magnetic flux generated from the coil 10b and the flow of water intersect perpendicularly, and the Lorentz force can be efficiently applied to the water.

<Third Embodiment>
Further, as shown in FIG. 2, an electrolytic water tank 11 that removes impurities by flowing a current between electrodes provided in water may be provided in the path of the circulation pipe 6. This electrolyzed water tank 11 is connected to the circulation pipe 6 at the water inlet and outlet, temporarily retains the water flowing in from the inlet, and discharges it from the outlet.
The first to third electrodes 11a, 11b, and 11c are arranged in the electrolytic water tank.

The first and second electrodes 11a and 11b are connected to one signal generator 11d. The signal generator 11d preferably provides a high-period square wave between the first and second electrodes 11a and 11b.
The third electrode 11c is disposed between the first and second electrodes 11a and 11b and is grounded.
Therefore, a direct current square wave is generated between the first electrode 11a and the third electrode 11c and between the second electrode 11b and the third electrode 11c, respectively. A high-frequency alternating current is generated between the second electrode 11b.

Thereby, water is electrolyzed at each electrode to generate oxygen and hydrogen bubbles. Since the generated hydrogen dissolves in water with supersaturation, the oxidation-reduction potential of water decreases and becomes a reduction potential. At this time, among the impurities contained in the water, the oxide generated by the hydrolysis or thermal oxidation of the oil is reduced and returned to a low viscosity state, so that the oxide or the like is prevented from adhering in the circulation pipe 6. can do.
Further, since metal such as calcium is ionized and easily dissolved in water, it is possible to prevent the metal from adhering in the circulation pipe 6. In addition, it is effective in preventing bacterial growth and sterilization.

  Moreover, you may provide the 1st-3rd electrodes 11a, 11b, and 11c in the filter 7a upstream part in the filtration water tank 7, without providing the electrolytic water tank 11 independently.

It is a schematic diagram which shows the water circulation fryer concerning embodiment of this invention. It is a schematic diagram which shows an electrolytic water tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage tank 1a Water intake 1b Shut-off valve 1c Supply port 2 Oil layer 2a Oil high temperature part 2b Oil low temperature part 3 Water layer 4 Heater 5 Pump 6 Circulation pipe 7 Filtration water tank 7a Filter 9 Magnetic field generator 9a Tubing 9b Coil 9c Signal generator 10 Magnetic field generator 10b Coil 10c Signal generator 11 Electrolyzed water tank 11a First electrode 11b Second electrode 11c Third electrode 11d Signal generator 12a Impurity removal pipe 12b Water supply pipe

Claims (5)

A storage tank for storing an oil layer for cooking and a water layer in contact with the boundary surface in two upper and lower layers;
A heater disposed in the oil layer;
A fryer having a circulation pipe that sucks water in the storage tank from a water suction port and returns the water from the supply port to the water layer,
A flyer characterized in that an AC voltage is applied to a coil wound around a part of the circulation pipe to cause an electromagnetic field to act on water flowing in the circulation pipe.   In the circulation pipe path, a filtration water tank that removes fried debris etc. by an internal filter is arranged, and a water supply pipe that can supply new water to the filtration water tank is connected to the front side of the circulation pipe. 2. The flyer according to claim 1, wherein the coil is wound between a circulating pipe and a connecting portion of the water supply pipe and a filtrate water tank. A storage tank for storing an oil layer for cooking and a water layer in contact with the boundary surface in two upper and lower layers;
A heater disposed in the oil layer,
A fryer that horizontally rotates the water in the water layer in a spiral shape,
A fryer characterized in that an AC voltage is applied to a coil disposed in a water layer in a storage tank to cause an electromagnetic field to act on water in the water layer. A storage tank for storing an oil layer for cooking and a water layer in contact with the boundary surface in two upper and lower layers;
A heater disposed in the oil layer;
A fryer having a circulation pipe that sucks water in the water layer from the storage tank and returns the water layer to the water layer again.
An electrolytic water tank for temporarily retaining water is provided in the path of the circulation pipe, and the first and second electrodes to which an AC voltage is applied are disposed in the electrolytic water tank, and are arranged between these electrodes and grounded. And a third electrode, and a direct current is allowed to flow from the first and second electrodes to the third electrode. A storage tank for storing an oil layer for cooking and a water layer in contact with the boundary surface in two upper and lower layers;
A heater disposed in the oil layer;
A method for preventing impurities from adhering in a circulation pipe of a fryer having a circulation pipe that sucks water in the storage tank from a water suction port and returns the water from the supply port to the water layer,
A fryer impurity adhesion prevention method comprising the step of applying an electromagnetic field to a part of a circulation pipe, and the electromagnetic field acts on water flowing through the circulation pipe.

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