JP2001145574A - Fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the mounting structure of an electromagnetic induction heating means furnished with a heating tube that is dipped into an oil tank to heat oil so that the cleaning of oil in the oil tank may be facilitated. SOLUTION: A heating means 23 provided with a heating tube 21 dipped into oil 2 in an oil tank 11, and an electromagnetic induction coil 22 heating the tube by electromagnetic induction heating, and a heat source unit Y with which an ascending and descending means 41 supporting the heating means 23 and moving upward and downward is integrated are arranged detachably in the oil tank 11. A transport conveyor 31 is arranged above and below the heating tube 21 dipped into the oil 2 in the oil tank 11. During cleaning to remove dust 9 gathered at the bottom of the oil tank 11, the heat source unit Y is raised upward of the oil tank 11 together with the transport conveyor 31 to facilitate cleaning. A cooling passage M through which a refrigerant such as air passes is formed in the interior of the heating means 23 dipped into the oil 2 to prevent the heating means 23 from overheating in the oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fryer for cooking food by immersing ingredients in heating oil in an oil tank, and more particularly, to heating a heating tube immersed in oil in an oil tank with an electromagnetic induction coil. The present invention relates to a continuous fryer in which oil is heated to a predetermined temperature, and ingredients are continuously supplied into the oil by a conveyor to heat and cook.

[0002]

2. Description of the Related Art A continuous fryer for successively immersing a large number of ingredients such as frozen foods in a heating oil in an oil tank at a food factory and continuously cooking the food is a gas fryer for heating oil in an oil tank with a gas burner. In general, an electromagnetic induction type fryer is heated by Joule heat by electromagnetic induction. The former gas fryer has a smaller capital investment burden than the latter electromagnetic induction fryer of the same size, but has problems such as poor thermal efficiency, rapid oil deterioration, and a bad working environment due to exhaust gas. Electromagnetic induction fryers have been attracting attention and are becoming popular for improving the working environment.

[0003] In an electromagnetic induction type continuous fryer, a plurality of heating tubes heated by electromagnetic induction are immersed in oil in an oil tank to heat the oil to a predetermined temperature, and a food material is conveyed into the heated oil by a conveyor. The heating and cooking are carried continuously, and an example thereof will be described with reference to FIGS. 19 and 20. The fryer shown in FIG.
Are fixed at predetermined intervals, and the electromagnetic induction coils 5
And a conveyor 6 and a holding conveyor 7 are arranged above each heat generating tube 4 in the oil tank 3. The heat generating pipe 4 is a straight pipe having both ends opened, and both ends are liquid-tightly welded to both side walls of the oil tank 3. Openings at both ends of the heating tube 4 open to the side surface of the oil tank 3, and the electromagnetic induction coil 5 is inserted into the heating tube 4 from this opening. The heating tube 4 and the conveyor 6 are immersed in the oil 2 stored in the oil tank 3, and the lower part of the holding conveyor 7 is immersed.

When the electromagnetic induction coil 5 is energized, an eddy current flows through the heat generating tube 4 due to electromagnetic induction, and the heat generating tube 4 generates heat by Joule heat, and the oil 2 is heated. The conveyor 6 is a substantially horizontal endless conveyor having both ends stretched by a pair of pulleys 8.
The food 1 is continuously driven in the heating oil 2 in the horizontal direction by being continuously driven at a fixed position above the heating tube 4. The presser conveyor 7 is continuously driven in the food conveying direction at a fixed position above the conveyor 6 to prevent the food 1 heated and cooked on the conveyor 6 from rising.

[0005]

When foodstuffs 1 such as frozen foods are cooked with heating oil 2, garbage 9 such as fried foods of foodstuffs 1 accumulates at the bottom of oil tank 3. The cleaning work for removing the trash 9 is performed manually by removing the conveyors from the oil tank 3 and inserting a cleaning tool into the bottom of the oil tank 3 from between the plurality of heat generating tubes 4. There was a problem that the interval between the pipes 4 was so narrow that the cleaning operation was difficult. Although not shown, the outer diameter of a circular heating tube is reduced, or the width of the heating tube is reduced by making the heating tube a flat tube, or the interval between adjacent heating tubes is increased by reducing the number of heating tubes. A fryer has been proposed to facilitate the work of cleaning the bottom of the oil tank by setting it, but there is a limit to the ease of cleaning because the heating tube is left in the oil tank.

[0006] In addition, the opening end face of the heat generating tube heated by electromagnetic induction is welded to the inner wall surface of the oil tank so as to be liquid-tight so as not to leak oil, but cracks occur due to thermal stress fatigue at this welded portion. And the maintenance and inspection was troublesome.

Further, a plurality of heat pipes are fixed at fixed positions at the bottom of the oil tank, and the temperature of each heat pipe is controlled to control the temperature such as the temperature distribution of the entire oil in the oil tank. It is difficult to control various and delicate oil temperatures or temperature distributions adapted to the type of foodstuff, and therefore, depending on the type of foodstuff, the cooking condition is not always appropriate.

It is an object of the present invention to provide an electromagnetic induction type continuous fryer which can easily clean the inside of an oil tank and maintenance and inspection of equipment, and can easily control the temperature of oil adapted to the type of food. is there.

[0009]

According to a first aspect of the present invention, there is provided an oil tank for storing oil for heating and cooking food, and a heating tube immersed in the oil in the oil tank to heat the oil. A heating means having an electromagnetic induction coil housed in the heating tube and heating the heating tube; and a fryer having a transport conveyor immersed in oil in an oil tank and transporting the foodstuff in the substantially horizontal direction in the oil, Means, and a heat source unit integrating a lifting means for vertically moving between a position where the heating means is immersed in the oil in the oil tank and a position where the heating means is pulled up from the oil while supporting the heating means, with respect to the oil tank. It is characterized by being provided detachably.

Here, the elevating means of the heat source unit is a member for directly supporting one or both of the heating tube and the electromagnetic induction coil as the heating means, and the elevating means raises the heating means from the oil in the oil tank. Thus, the bottom of the oil tank can be cleaned without being disturbed by the heating means. One or more such heat source units are provided for one oil tank.

Further, the invention of claim 2 of the present invention is characterized in that a transport conveyor is detachably mounted on the elevating means of the heat source unit. By arranging the transport conveyor for transporting the foodstuffs in the oil in the oil tank in the heat source unit, the transport conveyor is pulled up from the oil in the oil tank together with the heating means, and the inside of the oil tank is more easily cleaned.

Further, the invention according to claim 3 is characterized in that the transport conveyor is an endless conveyor that circulates from a forward path on the heat pipe of the heating means to a return path below the heat pipe. In other words, by installing the conveyor so that the heating means of the heat source unit is sandwiched between the endless conveyors, the overall thickness (height) of the heating means and the unit of the conveyor can be made smaller, and The space inside is effectively used by the heating means, and the amount of oil immersed in the heating means and the conveyor and the height of the oil tank are reduced.

According to a fourth aspect of the present invention, a cooling passage for a refrigerant for forcibly cooling the heating tube and the electromagnetic induction coil housed in the heating tube is formed in the heating tube of the heating means in the heat source unit. And In other words, if the heating means of the heat source unit can be taken in and out of the oil in the oil tank, when the heating means is immersed in the oil to heat the oil, particularly the electromagnetic induction coil of the heating means may be overheated. In order to avoid overheating, it is desirable to form a cooling passage through which a refrigerant such as air passes in the heat generating pipe, and to forcibly cool the heating means itself so as not to overheat when heating the oil.

According to a fifth aspect of the present invention, the elevating means of the heat source unit is provided with a communication passage communicating with a cooling passage in the heat pipe, and the heating means is forcibly cooled through the elevating means. I do. In this case, a hollow duct cover or the like may be used as the lifting / lowering means, and the hollow portion of the lifting / lowering means may be used as a communication path, or a dedicated communication pipe may be provided inside the lifting / lowering means.

Further, the invention according to claim 6 is characterized in that the heat source unit is installed so as to be movable in the food transport direction with respect to the oil tank, and the heating means is movable in the food transport direction in the oil in the oil tank. It is characterized by. In other words, if the heat source unit is installed in the oil tank so that the heat source unit can move in the horizontal direction with respect to the fixed oil tank, the heat source unit can be adjusted in accordance with the required temperature distribution of the oil in the oil tank in the horizontal direction. By moving horizontally, the oil temperature distribution can be adjusted according to the type of food and the content of cooking.

According to a seventh aspect of the present invention, there is provided a partition plate having openings on both the entrance side for introducing foodstuff and the exit side for extracting foodstuff, between the conveyor and the heat generating tube, and carrying the foodstuff on the partition plate. It is characterized in that oil is caused to flow by pump means from the food inlet side to the food material outlet side. Such an oil flow promotes efficient and uniform heating of the foodstuff.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to FIGS.

The fryer shown in FIG. 1A heats the oil 2 by immersing the lower part of the heat source unit Y separate from the oil tank 11 in the oil 2 in the oil tank 11, and heats the food 1 with the heated oil 2. FIG. 1B shows a state in which the heat source unit Y is pulled up from the oil 2 in the oil tank 11. The heat source unit Y includes a heating means 21 having a heating tube 21 immersed in the oil 2 in the oil tank 11 to heat the oil 2 and an electromagnetic induction coil 22 housed in the heating tube 21 and heating the heating tube 21. It has a basic structure in which lifting means 41 which can move up and down with respect to the oil tank 11 are connected to both ends.

In the oil in the oil tank 11, a conveyor 31 for transporting the foodstuff 1 in a substantially horizontal direction in the oil is disposed, and a pressing conveyor 32 is provided at a fixed position above the conveyor 31 as necessary. Be placed. A pair of the transport conveyor 31 and the holding conveyor 32 is unitized, and this conveyor unit is separably connected to the heat source unit Y. In the embodiment of FIG. 1, the transport conveyor 31 is arranged so as to circulate above and below the heating means 23 of the heat source unit Y, and the units of the transport conveyor 31 and the pressing conveyor 32 move up and down integrally with the heat source unit Y. I have to do it.

The heating means 23 of the heat source unit Y is constructed by inserting a substantially circular electromagnetic induction coil 22 concentrically into a substantially circular heating tube 21 as shown in the sectional view of FIG. The electromagnetic induction coil 22 is mounted on the outer periphery of a cylindrical iron core 24, and an iron core fixing pipe 25 is penetrated and fixed on the inner periphery of the iron core 24.

A single heat source unit Y or a plurality of heat source units Y is detachably provided for one oil tank 11. A single or a plurality of heating means 23 are installed in one heat source unit Y. For example, as shown in FIG. 2, three round bar-shaped heating means 23 are arranged in parallel in a horizontal direction at regular intervals in one heat source unit Y. The elevating / lowering means 41 that supports each end of the three heating means 23 includes, for example, a rectangular box-shaped duct cover 42 that is vertically and horizontally wide. This duct cover 2
The opening ends of the heat generating tubes 21 are fixed to the inner wall of each duct cover 42 in a liquid-tight manner by welding or the like (see FIG. 4).

As shown in FIG. 1A, the oil 2 in the oil tank 11
The lower portion of the heat source unit Y is immersed in the foodstuff 1 to cook the food 1. In this case, the plurality of heating means 23 are
The food 2 is immersed in the oil near the bottom of the heating unit 1 to heat the oil 2 to a desired temperature, and the foodstuffs 1 are transported in the substantially horizontal direction in the oil by the transport conveyors 31 arranged above and below the heating tube 21 of the heating means 23. It is cooked by heating oil 2. A plurality of foodstuffs 1 are placed on an outbound conveyor 31a that moves forward just above the heat pipes 21 of the conveyor 31 and are conveyed in the oil, and unnecessary lifting of the foodstuffs 1 is prevented by the press conveyor 32. When the foodstuffs 1 are conveyed to the vicinity of the forward end of the forward conveyor 31a, the foodstuffs 1 are taken out, and the forward conveyor 31a moves to a position directly below the heat generating tube 21 to become a return conveyor 31b that moves backward.

By using the endless conveyor structure in which the conveyor 31 is disposed above and below the heating means 23 as described above, the amount of oil 2 stored in the oil tank 11 can be reduced. That is, as shown in FIG. 1A, when the heating tube 21 of the heating means 23 is sandwiched between the forward conveyor 31a and the backward conveyor 31b of the transport conveyor 31 from above and below, the heating tube 21
And the thickness of the conveyor 31 are equal to the thickness H of the conveyor 31. On the other hand, when the conveyor 6 is arranged right above the heating tube 4 as in the fryer of FIG.
The thickness H ′ from the lower surface of the heat generating tube 4 to the upper surface of the conveyor 6 becomes larger than the sum of the thickness of the heat generating tube 4 and the thickness of the conveyor 6, and a relationship of H ′> H is established. '
The amount of oil used in the fryer of FIG. 1 can be reduced by an amount corresponding to -H). Further, the oil tank 11 of the fryer in FIG. 1 is downsized in the height direction by an amount corresponding to the difference (H′−H).

The cleaning of the trash 9 in the oil tank 11 is performed as shown in FIG.
As shown in (B), the heat source unit Y may be pulled up from the oil tank 11 directly above. For example, the raising and lowering means 41 of the heat source unit Y is engaged with a lifter (not shown) to raise the heating means 23 and the conveyor unit from the oil 2. As a result, there is no obstacle in the oil tank 11 that interferes with cleaning, and the work of removing dust 9 such as fried scum accumulated at the bottom of the oil tank 11 can be performed easily and quickly. Further, if the bottom of the oil tank 11 is formed in a ship bottom shape as shown in FIG. 1, the dust 9 naturally flows and accumulates at the center of the bottom of the oil tank 11, so that the work of removing the dust 9 becomes easier.

Next, examples of the detailed structure of the heat source unit Y and various examples of the structure of attachment to the oil tank 11 will be described in order. When the heating means 23 of the heat source unit Y is immersed in the oil of the oil tank 11 to perform the oil heating operation, depending on the structure and material of the heating means 23, the heating means 23 may be overheated in the oil and the life may be shortened due to thermal fatigue. . Therefore, as shown in FIG.
A cooling passage M is actively formed inside the cooling passage 3 and a cooling medium is actively flowed through the cooling passage M to forcibly cool the heating means 23 so as to avoid the overheating.
The refrigerant flowing through the cooling passage M is air, an inert gas, or the like,
In practice, air is economical and appropriate. Also, the cooling passage M
Mainly uses the central passage Ma of the iron core fixed pipe 25 to form a cylindrical passage Mb between the electromagnetic induction coil 22 and the heat generating tube 21 and a small hole passage Mc penetrated through a plurality of portions of the iron core 24 in the radial direction. For supplementary use. The small hole passage Mc communicates with the central passage Ma.

In correspondence with the heating means 23, for example, FIG.
As shown in (1), the interior space of the hollow duct cover 42 supporting the heating means 23 is formed as a cooling passage N communicating with the cooling passage M of the heating means 23, and the heating means 23 is forcibly cooled via the cooling passage N. . The cooling passage N of the duct cover 42 is, for example, a cooling pipe Na connected to the end of the iron core fixing pipe 25 of the heating means 23 and supplying a coolant to the central passage Ma.
And a duct passage Nb formed in the inner space of the duct cover 42 communicating with the cylindrical passage Mb of the heating means 23. In FIG. 4, the heating means 2 is connected to the cooling pipe Na.
3 forcibly cools the iron core 24 and the electromagnetic induction coil 22 to suppress the overheating mainly in the central portion of the heating means 23 and average the temperature distribution over the entire length of the heating means 23. I do. Also, the heating means 23
Is used as a passage or the like through which the refrigerant discharged from the outlet of the central passage Ma flows backward, and the small hole passage Mc is used as a passage or the like that bypasses the refrigerant in the central passage Ma to the electromagnetic induction coil 22. .

A basic example of an air flow path pattern for forcibly cooling the heating means 23 with air will be described with reference to FIG. As shown in FIG. 5, a chimney-shaped exhaust pipe 43 is connected to upper end openings of a pair of left and right duct covers 42L and 42R. The cooling pipe Na is led out from the duct cover 42L on the left side of FIG. 5 and the blower fan 44 is connected. By driving the blower fan 44, outside air is blown from the cooling pipe Na to the central passage Ma of the heating means 23, and is discharged from the outlet of the central passage Ma into the duct cover 42R on the right side in FIG. Most of the air discharged into the duct cover 42R is discharged from the exhaust pipe 43 to the outside air, and the remainder flows backward through the cylindrical passage Mb of the heating means 23 into the left duct cover 42L and is discharged from the exhaust pipe 43. Is done. The heating means 23 is appropriately cooled by the above-described flow of air, and overheating is avoided. The air flow pattern is not limited to the pattern shown in FIG. 5, and a plurality of patterns can be selected. Specific examples will be described later with reference to experimental examples shown in FIGS.

Various examples of the detachable mounting structure of the heat source unit Y and the oil tank 11 are shown in FIGS. 6 to 10 and will be described in order. The heat source unit Y of FIG. 6 connects the upper parts of the pair of left and right elevating means 41 to a unit supporting frame 45, and detachably mounts both ends of the frame 45 to the upper ends of both walls of the oil tank 11; Is suspended in the oil tank 11 near the bottom. The mounting structure of FIG. 6 is effective when the entire heat source unit Y is relatively lightweight. Although a conveyor and a holding conveyor are not shown in FIG. 6, these conveyor units may be detachably connected to the frame 45 or the like.
This is the same in the embodiments shown in FIGS.

In the heat source unit Y shown in FIG. 7, a leg 46 is attached to the lower surface of a pair of left and right elevating means 41, and the leg 46 is placed on the bottom of the oil tank 11, so that the heating means 23 is connected to the oil tank 11.
Frame near the bottom of the frame 45
Slightly floats from the upper ends of both walls of the oil tank 11. The mounting structure shown in FIG. 7 is effective when the entire heat source unit Y is relatively heavy.

In the heat source unit Y shown in FIG. 8, only one of the pair of left and right elevating means 41 accommodates a wiring for supplying electricity to the heating means 23 and a cooling passage system, and the other supports one end of the heating means 23. In this case, the legs 46 are attached to the lower surfaces of the pair of lifting / lowering means 41 in consideration of the weight balance, and the legs 46 are attached to the oil tank 1.
By mounting the heating means 23 on the bottom of the oil tank 11, the heating means 23 is held near the bottom in the oil tank 11.

The fryer shown in FIG.
FIG. 6 shows only that a is a single flat plate inclined in the width direction.
Different from the flyer. In this case, if the dust discharge pipe 48 is connected to the lower end of the bottom plate 11a, the dust removal operation can be easily performed.

In the fryer shown in FIG. 10A, the heat source unit Y is installed in the oil tank 11 so as to be movable in the food transport direction. For example, when the heat source unit Y in FIG. 10A has a hanging structure similar to that in FIG. 6, a plurality of rollers 49 are attached below both ends of the frame 45 as shown in FIG. It is rollably mounted on the upper surfaces of both walls of the oil tank 11. As described above, when the heat source unit Y is installed in the oil tank 11 so as to be able to move laterally and the heating means 23 is moved laterally in the oil in the oil tank 11, the temperature distribution of the oil in the oil tank in the direction of transporting the food is changed. It is easy to variably adjust according to the type. In other words, foods are of a type that is preferably heat-treated with constant-temperature oil from the beginning to the end, a type that is preferably heat-treated with high-temperature oil and then heat-treated with low-temperature oil, Since there are various types such as a type in which it is preferable to first heat-treat with low-temperature oil and gradually heat-treat with high-temperature oil, the heat source unit Y is transported to the oil tank 11 according to the type of the food. It may be desirable to install in such a way as to be movable in the direction. A specific example will be described with reference to FIGS.

The fryer shown in FIGS.
The three heat source units Y are installed so as to be able to reciprocate in the longitudinal direction of the oil tank 11 (foodstuff transport direction). The total length of the bottom 11b of the oil tank 11 is set to be at least four times the width of one heat source unit Y. The fryer shown in FIG. 11 is obtained by separating the oil at the bottom 11 b and the middle 11 c of the oil tank 11 with a partition plate 51. The partition plate 51 is located at the entrance side IN for foodstuff import.
And an opening OUT on both sides of the food product outlet side OUT.
1c is forcedly circulated to the foodstuff entrance entrance IN, and the foodstuff exit exit OU opposite the entrance side IN of the intermediate portion 11c.
This is an oil-forced circulation system in which oil is caused to flow to T, and foodstuffs are conveyed in the flowing oil in the same direction for heat treatment. The fryer of FIG. 12 is of the oil natural convection type in which the partition plate 51 is removed from the fryer of FIG. 11, the gear pump 52 is stopped, and the oil flows in the oil tank 11 by natural convection.

In the case of the fryer shown in FIG. 11, the oil temperature at the food inlet side IN of the oil tank 11 becomes higher than the oil temperature at the food outlet side OUT, and this temperature distribution is adjusted by arbitrary movement of the three heat source units Y. You. In the case of the fryer shown in FIG. 12, the oil temperature at the foodstuff outlet side OUT of the oil tank 11 tends to be higher than the oil temperature at the inlet side IN, but the movement of the three heat source units Y makes the oil temperature distribution uniform or , A specific non-uniform distribution can be obtained.

FIG. 1 shows a modification of the fryer shown in FIG.
As shown in FIG. 3, the fryer of FIG. 13 has two heat source units Y installed on the bottom 11 d of the oil tank 11 so as not to be moved laterally. In this case, the oil temperature distribution cannot be adjusted by the lateral movement of the heat source unit Y, but the total length of the bottom portion 11b of the oil tank 11 can be reduced to about the total value of the widths of the two heat source units Y, and this reduced total length Only the amount of oil is reduced.

[0036]

14 to 18 show various forms of cooling of the heating means 23 by air in the heat source unit Y. The coil surface temperature (electromagnetic induction coil surface temperature) and the temperature between the core coils of the heating means 23 according to these various forms are shown. Table 1 shows the test results of (temperature between the iron core and the electromagnetic induction coil).

[0037]

[Table 1]

Table 2 shows the results of the power consumption and the heating efficiency of the heating means 23 according to the various embodiments shown in FIGS.

[0039]

[Table 2]

Here, FIG. 14 shows a case where the heating means 23 radiates heat naturally without forced cooling with air (cool air).
Is indicated by “self-cooling”. FIG. 15 shows forced cooling by passing cool air through the central passage Ma at the center of the heating means 23. The upper ends of the intake-side duct cover 42L and the exhaust-side duct cover 42R on both sides of the heating means 23 are opened to the atmosphere, and the central passage Ma is opened. Most of the cool air that has passed is exhaust-side duct cover 42.
R is discharged from the upper end opening of R, and a part thereof flows backward through the cylindrical passage Mb and is discharged from the upper end opening of the intake-side duct cover 42L. FIG. 16 corresponds to a configuration in which the upper end openings of the left and right duct covers 42L and 42R in FIG. 15 are formed in a chimney shape. FIG. 17 corresponds to the exhaust-side duct cover 42R of FIG.
The cool air that has passed through the central passage Ma flows backward through the cylindrical passage Mb and is discharged from the intake-side duct cover 42L. FIG. 18 shows the intake side duct cover 4
The 2 L upper end opening is closed with a stopper 55, a cooling pipe Na is passed through the stopper 55, and the tip of the cooling pipe Na is connected to the duct cover 42.
L, and the upper end opening of the exhaust side duct cover 42R is formed in a chimney shape.

According to the test results in Table 1, in the "self-cooling" type shown in FIG. 14, the heating means 23 may partially rise to a high temperature of 366.degree. C., but this does not cause a serious problem in service life. . Each of the air-cooled types shown in FIGS. 15 to 18 has no fear that the heating means 23 is heated to over 300 ° C.
All are known to have a long life. In particular, the “wind-cooled 3” type shown in FIG. 17 is effectively cooled by cold air,
It has been proven that the life is long.

The cooling effect of the heating means 23 and the oil heating efficiency are opposite to each other, and the results are shown in Table 2. The heating efficiency in Table 2 is slightly lower because the oil tank used for testing is larger than the actual one.
It can be seen that a high efficiency of about 70% is maintained as a whole. Therefore, if the heating means 23 is appropriately forcibly cooled in the above-described manner, there is no fear that the heating efficiency of the oil is greatly reduced, and the advantage of a sufficiently long service life to compensate for a slight decrease in the heating efficiency is assured.

[0043]

According to the first aspect of the present invention, a heat source unit in which an electromagnetic induction heating type heating means for immersing the oil in the oil tank to heat the oil and an elevating means for vertically moving the same is integrated into the oil tank. Since the heating means is lifted from the oil in the oil tank by the lifting means, the bottom of the oil tank can be easily and quickly cleaned without being disturbed by the heating means. In addition, since the oil tank and the heat source unit are detachable separate units, the troublesome work of connecting the heating pipe of the heating means to the oil tank by welding or the like can be omitted, improving productivity and reducing the number of welding points in the oil tank. Quality can be improved.

According to the second aspect of the present invention, the transport conveyor is detachably disposed on the elevating means of the heat source unit separate from the oil tank, so that the transport conveyor can be moved when cleaning the oil tank or replacing the oil. This can be performed at the same time as the movement of the heat source unit, so that the handling of the transport conveyor becomes convenient, and in particular, the cleaning of the oil tank becomes easier.

According to the third aspect of the present invention, the endless transport conveyor is arranged above and below the heat generating pipe of the heating means in the heat source unit, so that the entire thickness (height) of the heating means and the transport conveyor unit is provided. Can be reduced, the amount of oil immersed in the heating means and the conveyor and the height of the oil tank are reduced, and a more compact and economical fryer can be provided.

According to the fourth aspect of the present invention, since the heating means in the heat source unit is forcibly cooled by the refrigerant forcibly flowing through the cooling passage formed in the heat pipe, the entire heating means is immersed in the oil in the oil tank. Nevertheless, there is no fear of overheating, and the oil in the oil tank can be stably heated and the life of the heating means can be extended.

According to the fifth aspect of the present invention, since the heating means is forcibly cooled through the elevating means of the heat source unit, the heating means is directly immersed in the oil in the oil tank from the inside thereof. Cooling can be performed efficiently.

According to the sixth aspect of the present invention, the heat source unit is installed so as to be reciprocally movable in the food transport direction with respect to the oil tank, so that the heating means of the heat source unit can be arbitrarily moved in the food transport direction in the oil in the oil tank. It is possible to freely adjust the horizontal temperature distribution of the oil in the oil tank by moving it, so it is easy to adjust the oil temperature for each type of food with different cooking conditions. We can provide a flyer with excellent properties.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a main part of a fryer according to a first embodiment of the present invention when cooking food by heating, and FIG. 1B is a cross-sectional view of the fryer during oil cleaning.

FIG. 2 is a partial side view showing an outline of a heat source unit and a conveyor in the fryer of FIG.

FIG. 3 is an enlarged sectional view of a heating means in the heat source unit of FIG. 1;

FIG. 4 is a partial front view including a partial cross section of the heat source unit of FIG. 1;

FIG. 5 is a front view showing an outline of a heating means cooling passage of the heat source unit of FIG. 1;

FIG. 6 is a front view of a main part of a fryer showing a second embodiment of the present invention.

FIG. 7 is a front view of a main part of a fryer showing a third embodiment of the present invention.

FIG. 8 is a front view of a main part of a fryer showing a fourth embodiment of the present invention.

FIG. 9 is a front view of a main part of a fryer according to a fifth embodiment of the present invention.

FIG. 10A is a front view of a main part of a fryer showing a sixth embodiment of the present invention, and FIG. 10B is a partial side view of the fryer.

FIG. 11 is a side view of a main part of a fryer showing a seventh embodiment of the present invention.

FIG. 12 is a side view of a main part of a fryer showing an eighth embodiment of the present invention.

FIG. 13 is a side view of a main part of a fryer according to a ninth embodiment of the present invention.

FIG. 14 is a front view showing a first cooling mode of the heat source unit.

FIG. 15 is a front view showing a second cooling mode of the heat source unit.

FIG. 16 is a front view showing a third cooling mode of the heat source unit.

FIG. 17 is a front view showing a fourth cooling mode of the heat source unit.

FIG. 18 is a front view showing a fifth cooling mode of the heat source unit.

FIG. 19 is a cross-sectional view of a main part of a conventional electromagnetic induction heating type continuous fryer.

FIG. 20 is a partial side view including a partial cross section of the fryer of FIG. 19;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foodstuff 2 Oil 11 Oil tank 21 Heating tube 22 Electromagnetic induction coil 23 Heating means 31 Conveyor 41 Elevating means Y Heat source unit M Cooling passage N Cooling passage

Claims (7)

[Claims] 1. A heating device having an oil tank for storing oil for cooking food, a heating tube immersed in the oil in the oil bath to heat the oil, and an electromagnetic induction coil housed in the heating tube and heating the heating tube. Means, in a fryer having a conveyor that is immersed in oil in an oil tank and conveys foodstuffs in the oil in a substantially horizontal direction, the heating means, and the heating means supporting the heating means and heating the oil in the oil tank. A fryer characterized in that a heat source unit in which an elevating means for moving up and down between an immersed position and a position pulled up from the oil is integrated is detachably disposed in the oil tank. 2. A conveyor according to claim 1, wherein said conveyor is detachably mounted on said elevating means of said heat source unit.
The described flyer. 3. The fryer according to claim 2, wherein the conveyor is an endless conveyor that circulates from a forward path on the heat pipe of the heating means to a return path below the heat pipe. 4. A cooling passage for a refrigerant for forcibly cooling the heat generating tube and the electromagnetic induction coil housed in the heat generating tube is formed in the heat generating tube of the heating means in the heat source unit. Flyer. 5. The fryer according to claim 4, wherein a communication passage communicating with a cooling passage in the heat generating tube is formed in the elevating means of the heat source unit, and the heating means is forcibly cooled through the elevating means. 6. The fryer according to claim 1, wherein the heat source unit is installed so as to be movable in a food transport direction with respect to the oil tank. 7. The endless conveyor that circulates on a forward path and a return path on a heating tube of a heating means, and
A partition plate having openings on both the food carry-in entrance side and the food carry-out exit side is disposed between the transport conveyor and the heating pipe, and the food carry-in entrance side and the food carry-out exit side are provided on the partition plate. 3. The fryer according to claim 2, wherein the oil is caused to flow by a pump means.