JP2012143274A - Flyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fryer having advantages such as that there is no heating source in an oil tank, or that a fried residue is difficult to burn.
A fryer includes an oil tank and an electromagnetic induction coil that heats the oil tank. The oil tank 10 includes a rectangular parallelepiped upper portion 11, a quadrangular pyramid-shaped bottom portion 13 inclined downward toward the center, and a rectangular parallelepiped waste reservoir portion 14 formed at the top portion (the previous portion) of the bottom portion 13. Have. The coil 20 is disposed on the outer lower surface of the inclined side wall 13 a of the bottom portion 13. That is, since the coil 20 that is the oil heating source is disposed outside the oil tank 10, that is, since there is no heating source in the oil tank, the oil tank 10 can be easily cleaned. Further, the waste storage portion 14 is formed so as to be dug one step from the bottom portion 13, and further, since it is made of a nonmagnetic material, induction heating due to the magnetic flux of the coil 20 does not occur, and the temperature of the same portion increases. Can be prevented.
[Selection] Figure 1

Description

  The present invention relates to a fryer used for fried dishes such as fried potatoes and fried chicken at convenience stores and fast food stores. In particular, the present invention relates to an IH tabletop fryer having features such as easy cleaning and uniform temperature distribution in the tank.

  One of the counter-cookers used in convenience stores and the like is a table-type fryer that serves fried dishes such as fried potatoes and fried chicken. Counter cooking is widely used as a means to increase the profitability of convenience stores because it can provide freshly fried food. Such a desktop fryer generally uses a sheathed heater as a heating source.

FIG. 7 is a view showing an example of the structure of a conventional fryer using a sheathed heater.
The fryer 100 has an oil tank 110 for storing oil for frying food, a sheathed heater 120 disposed in the oil tank 110, and a casing 130 to which these are attached. The sheathed heater 120 is supported by the auto lift mechanism 140 so as to be movable between a position in the oil tank and a position above the oil tank. On the upper surface of the sheathed heater 120, a partition net 150 is installed to hold food so as not to sink downward.

  In the case of such a fryer 100, since the height of the sheathed heater 120 is relatively high, the depth of the oil tank 110 is deepened, and the amount of oil is increased accordingly. In addition, when cleaning the oil tank, the sheathed heater 110 must be lifted from the tank, which requires time and effort for cleaning.

  On the other hand, a fryer using an electromagnetic induction heating type heat pipe as a heating source has also been proposed (see, for example, Patent Document 1). In this fryer, the electromagnetic induction heating type heat pipe is detachably disposed in the oil tank, and has a cylindrical outer cylinder, an electromagnetic coil wound in the outer cylinder, and an insulating material covering the electromagnetic coil. And having. In this case as well, since the heat pipe is attached and detached during cleaning, the cleaning of the tank is still troublesome. Further, as in the case of the sheathed heater, an oil tank deeper by the diameter of the heat pipe is necessary, and the amount of oil increases.

Utility Kaihei 6-75320

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a fryer that has advantages such as no heating source in the oil tank or fried residue is difficult to burn.

  The fryer of the present invention is an IH heating fryer comprising an oil tank for storing oil for frying food, and an electromagnetic induction coil for heating the oil tank, wherein the oil tank has an inclined bottom surface, The coil is disposed on the outer bottom surface of the inclined bottom surface.

  According to the present invention, since the coil that is the oil heating source is disposed outside the oil tank, that is, there is no heating source in the oil tank, the heating source (coil, heating tube, sheathed heater, etc.) is within the oil tank. The oil tank can be easily cleaned as compared with the conventional one arranged in the above. Further, in the conventional one, the tank capacity is increased by the thickness of the heating tube and the sheathed heater, and the amount of oil corresponding to that is required. However, in the present invention, the amount of oil can be reduced.

Further, according to the present invention, the coil is disposed on the outer lower surface of the inclined bottom surface of the oil tank, so that the oil on the inclined bottom surface is heated, so that the oil above the portion is “heated and rises”. → A wide range of convection occurs in which “the rising oil flows toward the center of the oil tank” → “sinks downward at the center”.
When the coil is disposed outside the vertical surface of the oil tank, the heated oil region is relatively narrow, and the range in which the convection occurs is narrowed. Furthermore, the oil in the vicinity of the vertical surface is overheated, which is not preferable.
After all, the oil tank of the present invention can heat the oil in the oil tank more uniformly. In addition, the inclination angle (angle with respect to the horizontal direction) of the inclined bottom surface is preferably 30 to 40 °.

  Furthermore, since the bottom surface of the oil tank is an inclined bottom surface that is inclined downward toward the center, the amount of oil is smaller than in the case of a deep bottom plane. Furthermore, fried residue and food residue are likely to gather in the lower part along the slope.

  Note that the coil on the inclined bottom surface is preferably wound outside the relatively upper portion of the bottom surface. Thereby, a relatively upper portion where the coil is disposed becomes a hot zone, and a lower portion below the hot zone becomes a cool zone. Since oil residue and food residue are collected in a low part in the oil tank, that is, in the cool zone, the residue is difficult to burn and oil deterioration can be reduced.

  In this invention, it is preferable that the said oil tank has a lower dregs storage part provided ahead of the low part of the said inclined bottom face.

According to the present invention, fried residue, food residue, etc. in the oil tank are likely to gather in the low residue storage portion along the inclined bottom surface. Since this waste reservoir is a cool zone, the collected waste is difficult to burn.
Furthermore, it is preferable to form the waste storage part so as to be dug in one step from the inclined bottom surface, because this part is clearly isolated from the convection of the hot zone and the waste is difficult to be rolled up.

  In the present invention, it is preferable that at least a portion of the inclined bottom surface on which the coil is disposed is made of a magnetic material, and the residue storing portion is made of a nonmagnetic material.

If the residue storage part is made non-magnetic, induction heating due to the magnetic flux of the coil does not occur, so that the temperature rise in the part can be further prevented.
As the magnetic material, for example, ferritic stainless steel or a nonmagnetic material coated with a magnetic material can be used. As the nonmagnetic material, for example, austenitic stainless steel can be used.

  In the present invention, if the inclined bottom surface of the oil tank is an upwardly expanding quadrangular pyramid surface, the above-described convection is generated from the four sides of the tank, so that the oil tank has better thermal uniformity.

  In this invention, it is preferable that the said coil consists of a series of coil wires, and is wound so that the outer lower surface of the said upward spreading quadrangular pyramid surface inclined bottom surface may be circulated a plurality of times.

  According to the present invention, only two electrical connection points with the inverter of the coil are required, and the winding operation becomes relatively easy. Although the hot water bath molding operation itself is a little complicated, the total cost may be reduced.

  As is apparent from the above description, according to the present invention, the coil as the oil heating source is disposed outside the oil tank, that is, there is no heating source in the oil tank. The oil tank can be easily cleaned as compared with the arrangement. Furthermore, the amount of oil in the oil tank can be reduced.

  Furthermore, when the bottom surface of the oil tank is an inclined bottom surface that is inclined downward toward the center, fried residue, food residue and the like are likely to gather at a lower portion along the inclination. Since the temperature of the low part is relatively low, the collected residue is difficult to burn and oil deterioration can be reduced.

It is a sectional side view which shows the structure of the oil tank of the fryer which concerns on embodiment of this invention. It is a perspective view of the oil tank of FIG. It is a bottom view of the oil tank of FIG. It is a perspective view which shows the whole structure of the fryer which concerns on embodiment of this invention. It is a perspective view which shows the other example of the structure of an oil tank. It is a bottom view which shows the modification of the arrangement | positioning method of a coil. It is a sectional side view which shows an example of the structure of the conventional fryer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the overall structure of a fryer according to an embodiment of the present invention will be described with reference to FIGS.
The fryer 1 has an oil tank 10 that stores oil for frying food, and an electromagnetic induction coil 20 (see FIGS. 1 and 3) that heats the oil tank 10. These are accommodated in the main body casing 30.

  The main body casing 30 has a rectangular parallelepiped shape that is long in the front-rear direction (depth direction), and has a size that can be installed on a counter of a convenience store, for example. An opening to which the oil tank 10 is attached is open on the upper surface of the main body casing 30. A panel 31 is provided on the front surface of the main body casing 30. The panel 31 is provided with a touch sensor such as a menu or an on / off switch, and a display unit such as a timer or a temperature display. Furthermore, an inverter (not shown) for energizing the coil is disposed inside the main body casing 30. The output of the inverter can be adjusted by operating the panel 31 on the front surface of the main body casing 30.

Next, the structure of the oil tank will be described with reference to FIGS. 1, 2, and 3. FIG. 1 is a front sectional view of an oil tank and a diagram illustrating oil convection, FIG. 2 is a perspective view of the oil tank (not including a coil), and FIG. 3 is a bottom view of the oil tank.
As shown in FIGS. 1 and 2, the oil tank 10 includes a rectangular parallelepiped upper portion 11 that is long in the front-rear direction, a quadrangular pyramid-shaped bottom portion 13 that is inclined downward toward the center, and a top portion (the previous portion) of the bottom portion 13. ) And a rectangular parallelepiped-shaped dregs reservoir portion 14 formed in (4).

The upper portion 11 has four side walls 11a that are substantially vertical. The upper end of each side wall 11a is a folded portion 12 that is folded outward. The folded portion 12 is placed around the opening on the upper surface of the main body casing 30.
The bottom portion 13 has inclined side walls 13 a that are formed continuously from the lower ends of the side walls 11 a of the upper portion 11 and are inclined downward toward the center of the oil tank 10. The inclination angle θ of the inclined side wall 13a with respect to the horizontal plane is preferably 30 to 40 °.
The dregs storage part 14 is a part for collecting fried dregs and food dregs, and has a substantially vertical side wall 14a extending downward from the lower end of each inclined side wall 13a of the bottom 13 and a bottom wall 14b. . The bottom wall 14b is inclined slightly downward toward the front. An oil drain opening (not shown) is formed at the bottom of the bottom wall 14b.

  As shown in FIG. 1, a partition net 16 (or a basket) that holds food to be cooked is disposed at the boundary between the upper portion 11 and the bottom portion 13 in the oil tank 10. The partition net 16 can be removed from the oil tank 10 manually or by an auto lift mechanism.

The upper part 11 and the bottom part 13 are made of a magnetic material. As the magnetic material, for example, ferritic stainless steel (SUS430 or the like), a nonmagnetic material coated with a magnetic material, or the like can be used. Examples of the latter include, for example, an iron-based material (for example, MG-50 (trade name), Kobe Steel, on a base sprayed with a nickel-based material (for example, NA-955 (trade name), manufactured by Kansai Special Welding Rod)). And a ceramic coating is formed on the intermediate layer.
On the other hand, the scum reservoir 14 is made of a nonmagnetic material. As the nonmagnetic material, for example, austenitic stainless steel (SUS304, 316, etc.) can be used.

  As shown in FIGS. 1 and 3, an electromagnetic induction heating coil 20 is disposed on the outer surface of each inclined side wall 13 a of the bottom portion 13 via an insulating material 21. In detail, the coil 20 is arrange | positioned in the comparatively upper part (outer side) of the outer surface of each inclination side wall 13a. The electromagnetic induction heating coil 20 is made of, for example, a copper stranded wire. The coil 20 consists of a series of coil wires, and is wound around the outer surface of each inclined side wall 13a so as to circulate a plurality of times from the periphery of the scum reservoir 14, as shown in FIG. Both ends of the coil 20 are connected to an inverter. When a current is passed through the coil 20, magnetic lines of force are generated, and eddy currents are generated when the lines of magnetic force pass through the portions of the inclined side walls 13 a where the coils 20 are disposed (referred to as heated regions). The part is heated by resistance (induction heating).

The heating characteristics of the fryer 1 will be described with reference to FIG.
When a current is passed through the coil 20, the heated region of each inclined side wall 13a of the bottom 13 is heated as described above, and the oil above the region is intensively heated. Since the heated region is an inclined surface, at this time, a relatively wide portion of oil around the inside of the oil tank 10 is heated. The heated oil travels upward around the oil tank 10. And it goes to the inside where the temperature is low and sinks further downward to be heated. That is, as shown by the arrows in FIG. 1, convection occurs from the periphery of the oil tank 10 toward the center, downward in the vicinity of the center, and then toward the periphery. Such convection occurs on the four sides of the oil tank 10, and the oil in the oil tank is heated (the heated region is called a hot zone H).

On the other hand, since the heated region is formed relatively outside the inclined side wall 13a, the inclined side wall 13a and the waste reservoir portion 14 below the region are hardly heated (referred to as cold zone C). Further, the above-described convection hardly occurs in the residue reservoir portion 14. Further, the residue storage portion 14 is made of a nonmagnetic material, and induction heating due to the magnetic flux generated from the coil 20 does not occur. For this reason, the rise in the temperature of the waste reservoir 14 can be further prevented.
For example, when the temperature of the oil in the hot zone H is 180 °, the temperature of the oil in the cold zone C is about 110 to 120 °.

From the above description, the fryer 1 of the present invention has the following effects.
(1) Since the oil heating source (coil 20) is located outside the oil tank 10, the oil tank 10 can be easily cleaned. In addition, when the heating source is a heating tube or a sheathed heater, in addition to the amount of oil required for cooking, it was necessary to increase the tank capacity by these thicknesses. Since it is not necessary to secure the capacity occupied by the heating source, the capacity of the oil tank (amount of oil) can be reduced.

(2) Since the coil 20 is disposed on the outer surface of the bottom 13 of the side wall 13a inclined inward toward the bottom, the oil in a relatively wide area on the upper side (outside) of the inclined side wall 13a is heated. . The heated oil flows upward, which causes convection of the oil in a large plane. In particular, since the bottom portion 13 has a quadrangular frustum shape, convection occurs on the four surfaces of the oil tank 10, and the region where convection occurs is widened. As a result, the oil in the oil tank 10 can be heated uniformly.
On the other hand, when the coil is disposed on the outer surface of the vertical wall, only the oil in the vicinity of the inside of the wall is heated only, the convection occurs only in the portion close to the inside, and the convection hardly occurs near the center. Furthermore, the oil close to the side wall is likely to be overheated.
(3) Furthermore, the coil winding operation is easier than when the coil is disposed on the outer surface of the vertical wall.

(4) Since the coil 20 is wound around a relatively upper portion (outside) of the inclined side wall 13a, heating does not occur in the lower portion (inside). For this reason, it is possible to suppress an increase in the temperature of the residue reservoir 14 and the vicinity thereof. Therefore, it is possible to suppress overheating of the residue that sinks downward, and to reduce the deterioration of the oil.
(5) Further, since the waste reservoir portion 14 is made of a nonmagnetic material that does not generate induction heating, it is difficult to be heated, and overheating of the waste collected in the same portion can be suppressed.
(6) Furthermore, the residue storage part 14 is formed so as to be dug in one step from the inclined side wall 13 a of the bottom part 13. Thereby, the part 13 is clearly isolated from the convection, and the residue is difficult to wind up.

(6) Since each side wall 13a of the bottom portion 13 is inclined inwardly downward, the capacity of the portion below the partition net 16 that does not substantially contribute to cooking can be reduced, and the amount of oil is reduced. Less is enough. In particular, the amount of oil can be greatly reduced compared to a fryer with a vertical side wall.
(7) Fried dregs and food dregs falling from the food are likely to gather in the dregs reservoir 14 along the inner surface of the inclined side wall 13a.

(8) Since the coil 20 is formed by spirally winding a series of coil wires, the connection with the inverter is only required at two locations on both ends, and the winding work is facilitated.

Next, another example of the oil tank will be described.
FIG. 5 is a perspective view showing another example of the oil tank.
In the oil tank 10A of this example, the upper part 11 has a rectangular parallelepiped shape as in the oil tank 10 of FIG. However, the bottom portion 13 is not a quadrangular frustum shape in which four walls are inclined, but only two opposing walls (surfaces in the longitudinal direction in this example) are inclined side walls 13 a inclined downward toward the center of the oil tank 10. However, the other two opposite walls (surfaces in the short direction in this example) are vertical side walls 13b extending vertically from the side walls 11a of the upper portion 11 continuously. The dregs reservoir 14 includes a bottom wall 14b and a substantially vertical side wall 14a extending downward from the bottom wall 13 and continuously formed from the lower ends of the inclined side walls 13a and the vertical side walls 13b.

  By forming the oil tank in such a shape, the hot water tank molding operation is facilitated as compared with the oil tank of FIG.

Next, another example of how to wind the coil will be described with reference to FIG. In this example, the case where the oil tank of FIG. 5 is used will be described.
In FIG. 6A, a series of coils are spirally wound around each of the outer surfaces of the inclined side walls 13a of the bottom portion 13 and arranged.
In FIG. 6B, a plurality (three in this example) of spirally wound coils are arranged on the outer surface of each inclined side wall 13a of the bottom portion 13.

DESCRIPTION OF SYMBOLS 1 Flyer 10 Oil tank 11 Upper part 12 Folding part 13 Bottom part 14 Waste part 16 Partition net 20 Coil 21 Insulating material 30 Main body casing 31 Panel

Claims (5)

An oil tank for storing oil for frying food;
An electromagnetic induction coil for heating the oil tank;
An IH heating fryer comprising
The oil tank has an inclined inclined bottom surface;
A fryer characterized in that the coil is disposed on the outer lower surface of the inclined bottom surface.   The fryer according to claim 1, wherein the oil tank has a lower dregs storage portion provided at a tip of a lower portion of the inclined bottom surface. A portion of the inclined bottom surface where the coil is disposed is made of a magnetic material,
3. The fryer according to claim 2, wherein the waste storage part is made of a nonmagnetic material.   The fryer according to any one of claims 1 to 3, wherein the inclined bottom surface of the oil tank has an upwardly expanding quadrangular pyramid shape.   5. The fryer according to claim 4, wherein the coil is formed of a series of coil wires and wound around the outer lower surface of the upwardly extending quadrangular pyramidal inclined bottom surface a plurality of times.

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