JP3285279B2 - Flyer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fryer in which fried oil in an oil tank is heated to a predetermined temperature by an electric heater, and fries and tempura are cooked therein.

[0002]

2. Description of the Related Art In a conventional fryer, as a method for heating frying oil in an oil tank, there is a method in which a plurality of gas burners are arranged on the outer bottom of the oil tank and the oil tank is directly heated by the flame of the burner. (For example, Japanese Unexamined Utility Model Publication No. 1-12223 and Japanese Unexamined Patent Application Publication No. 4-92617) Further, as a device using an electric heater, a sheath heater is directly introduced into an oil tank to heat frying oil (Japanese Unexamined Patent Application Publication No. 3-251214). ), Or one in which a sheathed heater is disposed on the outer lower surface of an oil tank to cook fried food (Japanese Utility Model Laid-Open No. 4-93036).

[0003]

In the above conventional example,
The method of cooking fried food by burning gas has a problem of treating exhaust gas. That is, if the exhaust gas is discharged into the room, the working environment is reduced, and large-scale exhaust equipment is required to perform the outdoor exhaust. Further, since a large amount of air is consumed to burn the gas, it is necessary to introduce the air from the outside. Therefore, the equipment becomes large. Furthermore, in this combustion method, when exhaust gas is discharged outdoors, a large amount of heat is also released together with the exhaust gas, so that there is a problem that the thermal efficiency is low.

[0004] The type in which the sheathed heater is directly thrown into the oil tank has a higher thermal efficiency than the gas combustion type, but has the disadvantage that the oil deteriorates quickly because the frying oil directly contacts the hot surface of the heater. . For this reason, it is necessary to change the oil frequently, which causes problems on the global environment such as treatment of waste oil and increases costs.

Further, in a system in which a sheathed heater is provided on the outer lower surface of the oil tank for heating, the heater cannot be fixed to the lower surface of the oil tank in consideration of expansion and contraction during heating and cooling of the heater, so that high thermal efficiency can be obtained. Absent. Further, due to the structure of the heater, the heater cannot be arranged on the entire lower surface of the oil tank, and the watt density of the heater is high. Therefore, the temperature near the heater is high, but the temperature is low at a position away from the heater. There is a problem that temperature unevenness occurs.

Accordingly, the present invention improves the drawbacks of the conventional gas or electric heater by using a flat electric heater for heating the frying oil in the oil tank.

[0007]

According to the present invention, as a specific means, the heat insulating insulator and the heat radiating insulator are sandwiched between these insulators on substantially the entire flat surface of the outer bottom surface of the oil tank. A plurality of flat heaters each composed of a foil-shaped electric heating element are arranged and arranged so that the heat-dissipating insulator contacts the substantially flat surface, and one or more holding plates are provided on the lower surface of these flat heaters. The holding plate is fixed to the outer bottom surface of the oil tank by a fixing jig at a substantially central portion in the longitudinal direction and by a sliding jig via an elastic body near the outer peripheral end.

The holding plate is bent downward at its longitudinal end face to increase the strength, and an elastic body for fixing the outer peripheral end of the holding plate and a sliding jig are formed by a combination of a spring and a stepped bolt. The structure is such that the pressing load is constantly kept constant.

[0009]

According to the present invention, since the frying oil in the oil tank is heated by the electric heater, there is no generation of exhaust gas as in the case of gas combustion, and there is no need for a supply / exhaust duct, etc. Can be achieved.

Further, by mounting a plurality of planar heaters on substantially the entire outer bottom surface of the oil tank, the temperature of the oil tank bottom surface can be made uniform, and the thermal expansion at the time of temperature rise can be easily absorbed, and the heat can be easily absorbed. Deformation can be prevented. Further, since the frying oil does not directly contact the high-temperature surface of the flat heater, the deterioration of the oil is slow, the frequency of oil replacement is reduced, the cost can be reduced, and global environmental problems such as waste oil treatment are reduced. Can be reduced.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view in which a planar heater is attached to the entire outer bottom surface of the oil tank, FIG. 2 is a view of the attached state of the planar heater viewed from below, and FIG. 3 is a perspective view showing the configuration of the planar heater. is there. FIG. 4 shows a structure in which the vicinity of the outer peripheral end of the holding plate is pressed by a combination of an elastic stepped bolt and a spring so that the load is always kept constant.

In FIG. 1, reference numeral 1 denotes a metal oil tank having a large bottom area. An outer bottom surface 2 of the oil tank 1 is formed to be substantially flat, and a flat heater 3 shown in FIG. As shown in FIG. 3, the flat heater 3 includes a heat insulating insulator 4 made of mica plate, ceramic fiber, and the like, and a heat radiating insulator 5 containing aluminum nitride.
Ferrite stainless steel foil, nickel chrome foil,
It is configured with a foil-like electric heating element 6 having a high resistivity, such as an iron-chrome foil. The flat heater 3 has a heat-radiating insulator 5 facing the outer bottom surface 2 of the oil tank 1 and a heat-insulating insulator 4.
A stainless steel reinforcing holding plate 7 is placed underneath, and is fixed to the outer bottom surface of the oil tank 1 by a fixing jig 8 and a sliding jig 9 described later. Here, when the planar heater 3 is small, as shown in FIG. 3, one pressing plate 7 may be used for one heater, but when the planar heater 3 becomes large, FIGS. As shown in the figure, one flat heater 3 is fixed with a plurality of pressing plates 7. This is because, when the presser plate 7 becomes larger, the temperature difference in the presser plate 7 increases, and deformation and the like easily occur, and the temperature in the presser plate 7 is reduced by reducing the size of the presser plate 7 and using a plurality of presser plates. The difference is reduced to reduce the deformation.

At this time, as shown in FIGS. 1 and 2, there is a method of bending the end face 7a in the longitudinal direction downward to increase the strength.

The flat heater 3 and the holding plate 7 are attached to a substantially flat outer bottom surface of the oil tank 1 by tightening. For attachment to the outer bottom surface 2 of the oil tank, the center of the holding plate 7 is fixed by a fixing jig 8 composed of, for example, a bolt and a nut.

Further, the vicinity of the outer peripheral end face of the holding plate 7 is fixed by a sliding jig 9 having an elastic body 10 such as a coil spring interposed between a bolt and a nut, and the flat heater 3 and the holding plate 7 are thermally expanded. This portion can slide up and down even when elongation occurs.

The sliding portion will be described in more detail with reference to FIG. 4. In order to have a structure in which the pressing plate 7 and the planar heater 3 are constantly pressed against the bottom surface of the oil tank 1 with a constant load, a stepped bolt 9a is provided on the oil tank 1 side. Is fixed, and the planar heater 3, the holding plate 7, and the spring 10 are sequentially stacked and fixed with the washer 9b and the nut 9c.

Reference numeral 11 denotes a power supply for supplying power to the flat heater 3, reference numeral 12 denotes a temperature sensor for detecting the temperature of oil in the oil tank 1, and reference numeral 13 denotes a control device for controlling power supply to the flat heater 3.

Reference numeral 14 denotes a conveyor provided at a lower portion of the oil tank 1, reference numeral 15 denotes a floating prevention conveyor provided above the conveyor 14, and reference numeral 16 denotes a food material such as fry.

Next, the operation of the present invention having the above structure will be described.

An appropriate amount of frying oil is put into the oil tank 1, and then the power supply 11 is turned on to the flat heater 3 attached to the outer bottom surface 2 of the oil tank 1. When the flat heater 3 generates heat, the heat is transmitted to the bottom surface of the oil tank 1 via the heat radiating insulator 5 of the flat heater 3.

When the bottom surface of the oil tank 1 is heated, the inside of the oil tank 1 is heated by conduction, and the frying oil inside is heated. When the energization of the flat heater 3 is continued and the temperature of the frying oil reaches a predetermined temperature, the temperature sensor 12 detects this and sends a signal to the control device 13, where the energization of the flat heater 3 is performed. Stop. By the above operation, the temperature of the frying oil in the oil tank 1 is maintained at a predetermined temperature. On the other hand, the foodstuffs 16 pass through the frying oil over time on the conveyor 14 to produce fried foods of uniform quality.

Next, when comparing the temperatures of the respective parts in the cooking of the fried food, the bottom 2 of the oil tank 1 contains the fried oil, so that the fried oil deprives the heat and the temperature rise is small.
Therefore, there is no local heating and little thermal deformation at this bottom. However, the temperature of the holding plate 7 that pushes the flat heater 3 upward becomes high due to the heat generation portion of the flat heater 3 around the center fixing jig 8 and the outer peripheral end portion is away from the heat generation portion, so that the temperature rises. Also less. If there is a temperature difference in the heater holding plate 7 as well, heat is transferred by heat conduction. However, since this type of material is made of a material having higher strength and toughness than heat conduction (for example, stainless steel), heat is transferred. Generally, the conductivity is low. Therefore, when the shape of the holding plate 7 is enlarged, the temperature difference becomes large and the holding plate 7 is easily deformed. As a measure for preventing this deformation, in the present invention, the pressing plate 7 is divided and the flat heater 3 is pressed by a plurality of pressing plates 7, thereby reducing the temperature variation inside the pressing plate 7 and reducing the deformation.

Further, the outer peripheral portion of the holding plate 7 and the bottom surface 2 of the oil tank 1 are formed with a sliding jig 9 via a spring 10 so that the outer peripheral portion of the holding plate 7 is slidable up and down, so that expansion can be achieved. Even if it is, it can be easily absorbed.

[0024]

As described above, the present invention heats the frying oil in the oil tank by the flat electric heater, so that no exhaust gas is generated as in the case of gas combustion. Can be achieved. Further, the thermal efficiency can be improved as compared with gas combustion. In addition, the temperature of the bottom surface can be made uniform by providing a plurality of planar heaters and attaching them to substantially the entire flat surface on the outer bottom surface of the oil tank.

Further, since the frying oil does not directly contact the high temperature surface of the flat heater, the deterioration of the oil is slowed down, the frequency of replacing the oil is reduced, the cost is reduced, and problems on the global environment such as waste oil treatment are reduced. can do.

Further, a plurality of flat heaters are used, and the pressing plate is divided into one or more sheets, and the central portion is fixed in the longitudinal direction, and the vicinity of the outer peripheral end is made to have a sliding structure via a spring or the like. As a result, the flat heater increases its strength, and is constantly pressed against the bottom of the oil tank with a uniform force, and can easily absorb the thermal expansion when the temperature rises, improving the adhesion performance of the heater without causing thermal deformation. Thus, higher thermal efficiency can be ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state where a planar heater is attached to the entire outer bottom surface of an oil tank according to the present invention.

FIG. 2 is a bottom view of the mounting state of the planar heater as viewed from below.

FIG. 3 is a perspective view showing a configuration of the planar heater.

FIG. 4 is an enlarged sectional view of a mounting portion of an outer peripheral portion of a holding plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil tank 2 Oil tank bottom 3 Flat heater 7 Holding plate 8 Fixing jig 9 Sliding jig

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichiro Suzuki 5--20, Yoneizumicho, Kanazawa-shi, Ishikawa Asahi Co., Ltd. Examiner Takayuki Sugiura (56) References JP-A-1-230318 (JP, A JP-A-5-174949 (JP, A) Japanese Utility Model Application No. Sho 61-190920 (JP, U) Japanese Utility Model Application No. Sho 61-77919 (JP, U) Japanese Utility Model Application No. Sho 53-137970 (JP, U) Japanese Utility Model Utility Model Sho 56- 35319 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 37/12

Claims (3)

(57) [Claims] 1. A fryer in which fried oil in an oil tank is heated to a predetermined temperature by an electric heater and fried food such as fry and tempura is cooked in the fryer, a substantially flat surface of an outer bottom surface (2) of the oil tank (1) is provided. A flat heater comprising a heat insulating insulator (4), a heat radiating insulator (5), and a foil-like electric heating element (6) sandwiched between these insulators (4) and (5). A plurality of (3) are arranged side by side so that the heat radiating insulator (5) is in contact with the substantially flat surface, and one or more pressing plates (7) are provided on the lower surface of the planar heater (3). An oil tank (1) is placed at a substantially central portion in the longitudinal direction of the holding plate (7) by a fixing jig (8), and a portion near the outer peripheral end is slid by a sliding jig (9) via an elastic body (10). Outside bottom (2)
Flyer fixed to the. 2. The fryer according to claim 1, wherein the longitudinal end face (7a) of the holding plate (7) is bent downward to increase the strength of the holding plate (7). 3. An elastic body (10) for fixing the vicinity of the outer peripheral end of the holding plate (7) and a sliding jig (9) are a combination of a spring and a stepped bolt (9a). 2. The fryer according to claim 1, wherein the pressing load of (1) is always kept constant.