JPS5839525B2 - electric fryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric fryer used for frying foods in oil.

Generally, when producing processed foods by frying foods in oil, a device called a fryer is used for commercial purposes, but conventionally, this type of fryer has a structure that uses a gas or electric heater as its heat source. It is used.

However, conventional fryers using such a heat source generate a large amount of heat, so if the oil temperature is too high during cooking, unnecessarily high heat acts on the food in the frying pan, making it difficult to use processed foods. The disadvantage was that it was difficult to obtain.

In addition, when the oil temperature becomes high, it causes deterioration of the oil, which makes it difficult to obtain suitable processed foods, and also shortens the life of the oil, making it uneconomical to change the oil depending on the type of processed food. It had the disadvantage of being a target.

Furthermore, in fryers that use electric heaters, electric current is passed through nichrome wires, etc., and in this way, electrical energy is directly converted into Joule heat as a heat source, which consumes a large amount of power, which is the background of recent efforts to save energy. There was a problem that it was undesirable.

The present invention improves the above-mentioned drawbacks, makes it possible to obtain a suitable oil temperature for food processing, and thereby prevents oil deterioration.
The object of the present invention is to provide an electric fryer that consumes less power.

In addition, when installing the induction heating element during assembly, the induction heating element can be easily placed at a suitable position within the metal pipe via the positioning member provided on the outer periphery of the induction heating element, and the Another object of the present invention is to provide an electric fryer that can radiate uniform heat and quickly heat oil.

Hereinafter, the present invention will be explained along with the drawings.

1 to 12 show an embodiment of the present invention.

In these figures, 1 is the main body of the electric fryer,
This main body 1 is made of stainless steel, for example, and as shown in FIG. 1, a door 2 that can be opened and closed from approximately the center to the lower part of the front surface is provided, and an oil reservoir container can be appropriately stored inside. Or it can be used to store food.

Further, an operation panel section 3 is provided on the upper part.

The operation panel section 3 is provided with a power switch 4.degree.

In this case, in this embodiment, the operation panel 3 is formed to be inclined obliquely forward from the top to the bottom as shown by the broken line in FIG. A power switch 4 is located at the bottom right of the panel section 3, a power pilot 5 is located above it, and an overtemperature protection reset button 8 is located next to the power switch 4 toward the center. A temperature adjustment dial 7 is arranged, and an operating pilot 6 is provided above the temperature adjustment dial 7.

However, it goes without saying that the positions of each operation section are not limited to these, and can be changed as appropriate.

Reference numeral 9 denotes an oil tank provided in the upper part of the giant body 1. This oil tank 9 is made of a material with good thermal conductivity, such as stainless steel, and approximately in the center thereof, there is a section from one side 9a of the oil tank 9 to the other side. A plurality of pipe-shaped cylindrical portions 10 are formed so as to extend through the area 9b.

As shown in FIG. 4, inside this cylindrical portion 10, there is a substantially pipe-shaped conductor 1 made of copper that acts as a heat generating tube.
1 are arranged in each hollow part, and a substantially cylindrical induction heating element 12 is inserted and arranged through a gap so as not to come into contact with the inner peripheral surface of the pipe-shaped conductor 11. ing.

As shown in FIG. 5, this induction heating body 12 mainly has an induction heating coil 14 wound around an iron core 13.
The outer periphery of the coil 14 wound into a cylindrical shape is covered with a heat insulating material 15 made of glass fiber.

When incorporating the induction heating element 12 into the oil tank 9, as shown in FIG. The induction heating body 12 is inserted from inside one opening of the cylindrical part 10, and the induction heating body 12 is inserted into the other opening of the cylindrical part 10.
The other end is similarly fixed with a support member 17' via a bolt,
The induction heating element 12 is disposed approximately in the center of the oil tank 9 so that the induction heating element 12 is sandwiched between support members 17 and 17' on both sides of the oil tank 9.

In this case, as shown in FIG. 7, the axis of the cylindrical portion 10 and the axis of the induction heating body 12 are aligned, and the inner circumferential surface of the conductor 11 and the outer circumferential surface of the induction heating body 12 are aligned as described above. It is preferable to arrange the induction heating body 12 at a central position within the hollow part of the conductor 11 with a gap g in between so as not to contact each other.

That is, the reason for this is that when inserting the long induction heating element 12 into the cylindrical part 10, the induction heating element 12 is deviated and the inner surface of the cylindrical part 10 and the induction heating element 12 are separated from each other, as shown in FIG. A portion of the outer peripheral surface is likely to come into contact with the induction heating element 12, and in this state, the induction heating element 12 may be fixed via the above-mentioned support members 17, 17'.

In this case, the heat generated during heating may be transmitted to the coil 14 through the heat insulating material 15, causing damage to the coil 14.

Therefore, in the present invention, as shown in FIG. 9, a positioning protrusion 1 extending along the length direction of the outer circumferential surface of the induction heating element 12 and made of a material such as a heat insulating material.
2a, and a U-shaped guy 310a corresponding to the inner peripheral surface of the cylindrical portion 10. When inserting the induction heating element 12 into the cylindrical portion 10, the protrusion 12a
0a, and the induction heating body 12 is pushed in along the guide portion 10a.

Therefore, in the present invention, the induction heating element 12 can be disposed at a desired position via a gap without contacting the inner circumferential surface of the cylindrical portion 10, that is, the inner circumferential surface of a heating tube such as the conductor 11.

Note that although FIGS. 10 and 11 show various aspects of the protrusions of the induction heating body 12 and the corresponding guide portions of the cylindrical portion 10, the present invention is not necessarily limited to only these aspects. However, other design changes included in the present invention are also permitted.

FIG. 12 is a circuit diagram showing the electrical connection relationship of the present invention, in which RT is an input terminal to which AC power is applied;
1 indicates the power switch corresponding to numeral 4 in Fig. 1, Sl1 is an electromagnetic switch, Sl is an overtemperature protection switch corresponding to numeral 8 in Fig. 1, and Pl indicates whether or not the power switch corresponding to numeral 5 in Fig. 1 is turned on. pilot to notify the outside, operating pilot to indicate the operating status of the P24j induction heating element, C1 to C3 are the fifth
The coil of the induction heating body corresponding to the reference numeral 14 in the figure, K
1 and 2 are heat-sensitive tubes placed near the induction heating element to detect the heating temperature, and the heat detected by this heat-sensitive tube is transferred to the thermostat L inserted between the electromagnetic switch S2 and the power switch 81. -H.

Further, the heat detected by the heat sensitive tube 2 is connected to an overtemperature protection switch S3 connected in series to the power switch S1.

Next, the present invention will be explained in detail.

First, during use, the contacts of the thermostat H and the overtemperature protection switch S3 are normally closed.

Now, when oil is injected into the oil tank 9 and processed foods are appropriately placed on a net (not shown) disposed above the cylindrical part 10 and the power switch S1 is turned on, the input terminal S is connected to the Switch S3. Power switch S1゜with thermostat 2
A closed circuit of the electromagnetic switch S2 and the input terminal T is formed,
As a result, the pilot P1 connected to this circuit lights up, and the coil of the electromagnetic switch S2 is excited.

Therefore, each contact of the electromagnetic switch S2 is closed, and therefore the input terminal R is connected to each of the coils C1 to C3 of the induction heating body.
, S, and T, respectively.

Therefore, each of the coils C1 to C3 of the induction heating body is magnetized, and the conductor 11 made of a copper ring that functions as a heating tube arranged around each coil is connected to the coils C1 to C3.
3, each of which is placed within an alternating magnetic field generated by 3.

Therefore, a voltage is induced in the conductor by electromagnetic induction, and a current flows in the conductor.

This current generates Joule heat, which heats the conductor itself.

In addition to Joule heat, the mode of heating action of induction heating is to use a magnetic material as the heat generating tube and use the heat due to hysteresis loss generated when magnetic flux flows through the heat generating tube made of the magnetic material as the heat source. .

Therefore, since the cylindrical part 10 having the conductor 11 therein is disposed so as to penetrate almost the center of the oil tank 9, the oil poured into the oil tank 9 is absorbed around the outer periphery of this cylindrical part 10. The heat radiated from the sieve causes gradual heating.

The heating effect obtained in this way is much softer than that using gas or the like as a heat source, so it has the advantage of providing a suitable heating effect depending on the type of food, making it suitable for food processing.

In this case, it is preferable to make the diameter of the cylindrical portion 10 large so that a wider area can be heated softly.

Furthermore, since the heat obtained by this induction heating varies depending on the frequency of the AC power supply, the material of the conductor 11, etc., it is possible to change not only the operating point setting of the thermostat H but also the frequency, material of the conductor 11, etc. as appropriate. It is also possible to obtain a desired temperature by changing the structure.

In addition, when the oil temperature reaches a certain temperature, the thermosensitive tube 1 detects this and operates the thermostat L-H, so which closed circuit is cut off first.

Therefore, the coil of the electromagnetic switch S2 is de-energized and the contacts of the electromagnetic switch S2 are opened, so that the induction heating action is stopped.

On the other hand, when the oil temperature drops, the thermostat H operates, its contacts close, and the oil is heated again.

In addition, in the event that the temperature becomes abnormally high, the overtemperature protection switch S3 inserted into the power switch S1 side through the heat-sensitive tube 2 is opened, and this essentially opens the power switch S1. It now works the same way as it did.

Therefore, if the oil in the oil tank 9 becomes dirty after or during use, the oil in the oil tank 9 can be easily replaced by opening the cock 9c of a well-known structure provided at the bottom of the oil tank 9. Alternatively, oil scum etc. that have settled below the oil tank 9 can be removed.

As described above, according to the present invention, a substantially pipe-shaped cylindrical portion penetrating through the substantially central portion of the oil tank is provided, and a substantially cylindrical induction heating element is positioned inside the heat generating tube provided within the cylindrical portion. The strips are arranged with gaps in between and are configured to uniformly heat the oil in the oil tank through the outer circumferential surface of the cylindrical part by induction heating, so that the oil is softly heated over a wide area of the outer circumferential surface of the cylindrical part. There are advantages to being able to do so.

In addition, since induction heating is used for heating,
If the number of turns of the coil of the induction heating element is increased, magnetic flux can be generated in proportion to the number of turns, and therefore a desired temperature can be obtained even with a small amount of electric power, which is economical.

In this case, a normal electric fryer that simply uses a heater consumes more than 5KW of power, but in the embodiment of the present invention, as a result of measurement, the rated voltage using three-phase AC of 200μ The power consumption was 3.35KW, and a remarkable power saving effect could be obtained.

Furthermore, since the induction heating element is provided with positioning protrusions, the induction heating element can be easily placed in a suitable position, and damage to the coil of the induction heating element can be prevented. It has the advantage of increasing service life.

[Brief explanation of the drawing]

Fig. 1 is a front view of the electric fryer according to the present invention, Fig. 2 is a front view of the electric fryer according to the present invention;
The figure is a side view, FIG. 3 is a plan view, FIG. 4 is an explanatory view of the cylindrical part of the oil tank of the electric fryer according to the present invention, seen from the front, and FIG. 5 is a cross-section of the induction heating body applied to the present invention. A schematic explanatory diagram, FIG. 6 is an explanatory diagram of the state in which the induction heating body is assembled into the cylindrical part, FIGS. 7 and 8 are diagrams explanatory of the arrangement state of the induction heating body, and FIG. An embodiment in which a strip is provided, FIGS. 10 and 11A and 11B are other embodiments of the same as above, and FIG. 12 is an explanatory diagram showing the electrical connection state of the present invention. 1...Cast body, 10...Cylindrical part, 11.
...Conductor, 12...Induction heating body, ...Guide part. 12a...protrusion, 10a...

Claims (1)

[Claims] 1 Almost in the center of the oil tank located in the upper part of the main body,
A pipe-shaped cylindrical part is formed, a heat generating tube is provided inside the cylindrical part, and an induction heating element is inserted into the heat generating tube through a positioning protrusion provided on its outer circumferential surface with a gap therebetween.
An electric fryer characterized in that the induction heating body heats the contents in the oil tank through the cylindrical part.