JPH09168484A - Electromagnetic induction heating type fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating type fryer which has good thermal efficiency, saves energy, and causes little degradation of oil. SOLUTION: A pipe-shaped heating element 5, made from a ferrite metal for heating oil, is provided at the center of the inside of an oil tank 4, and a coil 7 comprising a litz wire wound on a cylindrical pipe 6 made from a heat-resisting insulating material such as heat-resisting plastic or ceramics is inserted into the center of the inside of the pipe-shaped heating element 5 with a clearance of 10 to 20mm between the coil 7 and the pipe-shaped heating element 5. The coil 7 is formed in such a way as to be closely wound at each end and sparsely wound at its center in order to uniformly heat the pipe-shaped heating element 5, support plates 8 for supporting the coil 7 against the center of the pipe-shaped heating element 5 and for closing the space between the cylindrical pipe 6 and the pipe-shaped heating element 5 are provided on each end of the cylindrical pipe 6, and a cooling fan 9 for cooling only the coil 7 by passing air through only the inside of the cylindrical pipe 6 is mounted on one side of the cylindrical pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction heating type fryer that heats oil in an oil tank by electromagnetic induction heating to cook fried food.

[0002]

2. Description of the Related Art Conventionally, a fryer for frying food in oil and processing the food generally heats the oil tank from the outside by using a gas or an electric heater as a heat source. However, the uneven temperature of the oil causes a high temperature of 350 ° C. Therefore, the food cannot be heated uniformly,
Also, the oil deteriorated quickly.

An electromagnetic induction heating type fryer using electromagnetic induction heating has advantages that, unlike a gas type fryer, there is no exhaust gas, clean cool, energy saving, easy temperature control, safe and easy to use. Therefore, the electromagnetic induction heating type is expected to become more popular in the future.

As an electromagnetic induction heating type fryer, a system in which an object to be heated is placed in an oil tank and heated by a coil from the outside via a heat resistant insulating plate, for example, Japanese Patent Laid-Open No. 6-169.
There is an invention as shown in Japanese Patent No. 847. Further, for example, as disclosed in Japanese Utility Model Laid-Open No. 59-22635, there is a system in which a coil is wound around an iron core and is inserted into a cylindrical pipe in an oil tank.

[0005]

In the former example of the conventional electromagnetic induction heating type fryer, the structure of the oil tank is complicated, and the oil tank is also cooled when the coil is cooled, which causes a problem in thermal efficiency. Further, in the latter example, since the oil tank is indirectly heated, there is a problem that the thermal efficiency tends to decrease and the temperature of the coil portion becomes high.

It is an object of the present invention to provide an electromagnetic induction heating type fryer which efficiently heats oil by electromagnetic induction heating, saves energy, and causes little deterioration of oil.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. In an electromagnetic induction heating type fryer for heating fried oil in an oil tank by electromagnetic induction heating to cook fried food, A pipe-shaped heating element made of ferritic metal for heating oil was provided in the center, and a litz wire was wound around a cylindrical tube made of heat-resistant insulating material such as heat-resistant plastic or ceramics in the center of the inside of the pipe-shaped heating element. The coil is inserted with a gap of 10 to 20 mm between it and the pipe-shaped heating element, and this coil is formed by tightly winding both ends of the pipe-shaped heating element in order to uniformly heat the pipe-shaped heating element. At both ends of the cylindrical tube, a support plate is provided to support the coil in the center of the pipe-shaped heating element and seal between the cylindrical tube and the pipe-shaped heating element. only It was formed by attaching a cooling fan for cooling.

[0008]

With the above construction, the pipe-shaped heating element made of ferrite metal provided in the central portion of the oil tank efficiently heats the oil in the oil tank by electromagnetic induction heating without heat loss. A cylindrical tube made of a heat-resistant insulating material such as ceramics and a coil formed by tightly winding both ends on a cylindrical tube and roughly winding the central part heats the pipe-shaped heating element uniformly to prevent oil deterioration. The support plates provided at both ends of the cylindrical tube support the coil in the center of the pipe-shaped heating element to seal the gap between the cylindrical tube and the pipe-shaped heating element. Only the coil is cooled by passing air only inside the oil tank to prevent the oil tank temperature from decreasing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of an essential part of an electromagnetic induction heating type fryer according to an embodiment of the present invention, and FIG. 2 is a sectional view of an essential part of a coil portion thereof.

In the figure, reference numeral 1 is an inverter for performing electromagnetic induction heating, and an aluminum electromagnetic shield plate is attached to the upper portion of the inverter 1 to protect electronic components. The inverter 1 generates a high frequency of 20 to 25 kHz, but the high frequency has a feature that temperature control is easy. Reference numeral 2 is a controller unit that controls electric power and temperature. Reference numeral 3 denotes a body made of stainless steel, which houses the inverter 1 and the controller unit 2.

Reference numeral 4 denotes an oil tank made of stainless steel housed in the body 3, and a plurality of pipe-shaped heating elements 5 for heating oil are provided in the central portion of the oil tank 4 so as to uniformly heat the oil. . The pipe-shaped heating element 5 is made of a ferritic metal and is made of SUS430, and a cylindrical tube 6 made of a heat-resistant insulating material such as heat-resistant plastic or ceramics is provided in the center of the inside, and is wound around the outer periphery of the cylindrical tube 6. The coil 7 formed by winding the Litz wire is inserted. In order to heat the pipe-shaped heating element 5 uniformly, the coil 7 has its both ends densely wound and its central part roughly wound.

Support plates 8 are attached to both ends of the cylindrical tube 6 to attach the coil 7 to the center of the pipe-shaped heating element 5, and the distance between the pipe-shaped heating element 5 and the coil 7 is 10 to 2.
The pipe-shaped heating element 5 is heated uniformly at a high output by maintaining the impedance at 0 mm and matching the impedance. The support plate 8 also has a function of sealing the gap between the coil 7 and the pipe-shaped heating element 5 so that cooling air does not flow.

A cooling fan 9 is attached to one side of the cylindrical tube 6. 10 is an intake port, and the intake port 10
Is equipped with a filter to prevent oil components from adhering to electronic parts. Reference numeral 11 denotes a temperature sensor for keeping the oil temperature of the oil tank 4 at a temperature of about 180 ° C., which is attached near the side surface of the pipe-shaped heating element 5.

With the above structure, the inverter 1 is controlled by the controller 2 to generate a high frequency of 20 to 25 kHz, the output of the sensor 11 is received, and the oil temperature of the oil tank 4 is controlled to about 180 ° C. to generate a pipe-shaped heat. The body 5 generates heat by electromagnetic induction heating and heats the oil in the oil tank 4 to cook fried food. At this time, the pipe-shaped heating element 5 is efficiently heated without heat loss, and even if the cylindrical tube 6 and the coil 7 uniformly heat the pipe-shaped heating element 5 to reach a high temperature, the temperature is 240 ° C. or lower, and the oil deterioration is deteriorated. The support plates 8 provided at both ends of the cylindrical tube 6 support the coil 7 in the center of the pipe-shaped heating element 5 to seal the gap between the cylindrical tube 6 and the pipe-shaped heating element 5, The cooling fan 9 attached to the fan cools only the coil 7 by passing the air only inside the cylindrical pipe 6 to prevent the temperature of the oil tank 4 from decreasing.

[0015]

According to the present invention, since a pipe-shaped heating element made of ferritic metal and heated by electromagnetic induction heating is provided in the central portion of the oil tank, heat loss of oil in the oil tank is reduced and thermal efficiency is improved. In addition, a coil formed by winding a litz wire around a cylindrical tube made of a heat-resistant insulating material is inserted in the central portion of the pipe-shaped heating element with a gap of 10 to 20 mm between the coil and the pipe-shaped heating element, and both ends are closed. Since the center part of the winding is roughly wound, the pipe-shaped heating element is heated uniformly, there is no abnormal heating, there is no temperature unevenness of the oil, and the effect of preventing deterioration of the oil is great. Also, at both ends of the cylindrical tube, support plates for supporting the coil at the center of the pipe-shaped heating element and for sealing between the cylindrical tube and the pipe-shaped heating element are provided, and a cooling fan is attached to one side of the cylindrical tube. Only the coil is cooled by passing the air only inside, and the heat loss is small and the energy saving effect is great. Therefore, it is possible to provide an electromagnetic induction heating type fryer that is efficient, has little oil deterioration, and is convenient for frying foodstuffs at an optimum temperature.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of an electromagnetic induction heating type fryer showing an embodiment of the present invention.

FIG. 2 is likewise a sectional view of an essential part of a coil portion.

[Explanation of symbols]

 4 Oil tank 5 Pipe-shaped heating element 6 Cylindrical tube 7 Coil 8 Support plate 9 Cooling fan

Claims (2)

[Claims] 1. An electromagnetic induction heating type fryer for heating fried food by heating oil in an oil tank (4) by electromagnetic induction heating, wherein a pipe-shaped oil-heating pipe made of a ferritic metal is provided in the center of the oil tank (4). A heating element (5) is provided, and a coil (7) obtained by winding a litz wire around a cylindrical tube (6) made of a heat-resistant insulating material is provided at the center of the inside of the pipe-shaped heating element (5). And a coil (7) is supported at the center of the pipe-shaped heating element (5) at both ends of the cylindrical tube (6) and is inserted into the cylindrical tube (6) and the pipe-shaped tube. A cooling fan (9) is provided which is provided with a support plate (8) for sealing the space between the heating elements (5), and allows one side of the cylindrical tube (6) to pass air only inside the cylindrical tube (6) to cool only the coil (7). )
An electromagnetic induction heating type fryer that is equipped with. 2. The cylindrical tube (6) is formed of a heat-resistant insulating material such as heat-resistant plastic or ceramics in a cylindrical shape, and a litz wire is wound on the molded body to form the coil (7). Electromagnetic induction heating type fryer.