JP6246054B2 - Flyer - Google Patents

Description

  The present invention relates to a fryer provided with an oil tank for storing cooking oil and a heating means for heating the cooking oil in the oil tank.

Such a fryer is for fried cooking by putting the food to be fried in the oil tank in a state where the cooking oil in the oil tank is heated by the heating means.
In such a fryer, conventionally, a combustion gas flow chamber through which the combustion gas of the burner flows is provided so as to cover the outer surface of the bottom of the oil tank, and the heating means is configured by including this combustion gas flow chamber ( Hereinafter, there was a case called a flat bottom type) (for example, refer to Patent Document 1).
Also, a plurality of combustion gas flow pipes through which the burner combustion gas flows are provided so as to be immersed in cooking oil in the oil tank, and a heating means is configured by including these combustion gas flow pipes (hereinafter referred to as heating means). , Sometimes referred to as a dip tube type) (see, for example, Patent Document 2).

JP 2012-34963 A JP 2003-275105 A

Since the flat bottom type fryer is not provided in the oil tank with the members constituting the heating means, it is easy to clean the oil tank, so that the fryer is excellent in cleanability. On the other hand, in order to improve the heating efficiency for heating cooking oil, there is a limit to providing a combustion gas flow chamber in a wide range, so combustion that increases the amount of burner combustion and flows to the combustion gas flow chamber A method of enlarging the flow path of the combustion gas by increasing the gas amount or by providing a flow guide member that causes the combustion gas to flow in a meandering manner in the combustion gas flow chamber is envisaged. The burner is likely to be incompletely combusted and CO gas is likely to be generated, so there is a limit, and it is difficult to improve the heating efficiency.
The immersion pipe type fryer is excellent in heating efficiency because a plurality of combustion gas flow pipes are provided in a state of being immersed in cooking oil in the oil tank. On the other hand, when the fryer is cleaned, the structure provided with a plurality of combustion gas flow pipes is complicated, and the plurality of combustion gas flow pipes in the oil tank are obstructive, so it is difficult to clean the oil tank. .

In addition, both the flat bottom type fryer and the dip tube type fryer allow the hot combustion gas of the burner to flow through the combustion gas flow chamber and the combustion gas flow tube as a heating medium. The flow chamber and the combustion gas flow pipe are likely to deteriorate.
If the oil tank, combustion gas flow chamber, or combustion gas flow pipe cracks due to deterioration, the temperature of the combustion gas is higher than the spontaneous ignition temperature of the cooking oil. There is a risk of doing. Therefore, in order to prevent spontaneous combustion of cooking oil, it is necessary to configure an oil tank, a combustion gas flow chamber, and a combustion gas flow tube using an expensive material excellent in heat resistance. There was a problem of becoming higher.

  This invention is made | formed in view of this situation, The objective is providing the fryer which can prevent the spontaneous combustion of the cooking oil in an oil tank, aiming at the improvement of cleaning property and heating efficiency, and cost reduction. It is in.

The fryer according to the present invention is provided with an oil tank for storing cooking oil and a heating means for heating the cooking oil in the oil tank,
In the first characteristic configuration, the heating means includes a superheated steam generation device that generates superheated steam, and a superheated steam flow section that flows the superheated steam generated by the superheated steam generation device,
The superheated steam flow portion is arranged in a state of covering the entire outer surface of the oil tank,
The superheated steam generator includes a steam temperature adjustment unit capable of adjusting the temperature of the superheated steam to be generated,
The steam temperature adjusting unit is configured to adjust the temperature of the superheated steam to a temperature lower than the spontaneous ignition temperature of the cooking oil in the oil tank.

  According to the above characteristic configuration, the superheated steam generated by the superheated steam generation device including the steam temperature adjusting unit generates the superheated steam whose temperature is adjusted to a temperature lower than the spontaneous ignition temperature of the cooking oil, and the superheated steam thus generated is generated. However, it is supplied to the superheated steam flow part arrange | positioned in the state which covers the outer surface of an oil tank over the perimeter, and the cooking oil in an oil tank is heated by flowing through the superheated steam flow part.

That is, since the superheated steam flow portion is arranged in a state of covering the outer surface of the oil tank over the entire circumference, the superheated steam flow portion is arranged outside the oil tank, for example, over the entire outer surface of the oil tank. Since it can arrange | position in the wide range effectively with respect to a side surface, it becomes possible to heat the cooking oil in an oil tank over a wide range, and can improve a heating efficiency.
Moreover, since the member which comprises a heating means is not provided in an oil tank, it is easy to clean an oil tank and can improve the cleanability of a fryer.

Furthermore, since the temperature of the superheated steam supplied to the superheated steam flow section as a heating medium is adjusted to a temperature lower than the spontaneous ignition temperature of the cooking oil by the steam temperature adjusting section, it is used as a heating medium in a conventional fryer. Since it becomes lower than the temperature of the combustion gas of the burner which was made, the thermal fatigue of an oil tank and a superheated steam flow part can be suppressed effectively.
Therefore, by using superheated steam having a temperature lower than the spontaneous ignition temperature of cooking oil as the heating medium, the oil tank and the superheated steam flow section have higher heat resistance as much as when the combustion gas of the burner is used as the heating medium. Since it is not required, it effectively suppresses thermal fatigue and reliably prevents cracks in the oil tank and superheated steam flow part, while the oil tank and superheated steam flow part have high thermal conductivity and is relatively inexpensive. It can be configured using a simple material.
As a result, the cost of the fryer can be reduced and the heating efficiency can be further improved.
Therefore, it is possible to provide a fryer that can prevent spontaneous combustion of cooking oil in the oil tank while improving cleanability and heating efficiency and reducing the cost.

In addition to the first feature configuration, the second feature configuration is
The superheated steam flow part is disposed so as to cover the upper part of the outer surface of the oil tank, and a cool zone in which the cooking oil temperature is lower than that of the upper part is formed on the bottom side of the oil tank. There is in point.

That is, the oil residue and food residue generated when the food is placed in the oil tank and fried are collected at the bottom of the oil tank.
According to the above characteristic configuration, a cool zone in which the temperature of cooking oil is lower than that of the upper portion is formed on the bottom side of the oil tank, so that oil residue and food residue are difficult to burn.
Therefore, fried cooking can be performed while reducing deterioration of cooking oil.

In addition to the first or second feature configuration, the third feature configuration is
The superheated steam generator heats supplied water using a burner as a heat source to generate saturated steam, and heats saturated steam supplied from the steam generator using an electric heating unit as a heat source. And a superheated steam generator for generating superheated steam,
The steam temperature adjusting unit is configured to adjust the temperature of the superheated steam by adjusting electric power supplied to the electric heating unit.

According to the above characteristic configuration, in the steam generator, the supplied water is heated using the burner as a heat source to generate saturated steam, and the saturated steam is supplied to the superheated steam generator. In the superheated steam generator, Heating is performed using the electric heating unit as a heat source, and superheated steam is generated.
And the temperature of superheated steam is adjusted by adjusting the electric power supplied to an electric heating part by a steam temperature adjustment part.
In other words, by using an electric heating unit as a heat source for generating superheated steam in the superheated steam generator, the temperature of the generated superheated steam is accurately adjusted to a predetermined temperature lower than the spontaneous ignition temperature of cooking oil. Will be able to. Thereby, the cooking oil in the oil tank can be accurately heated to a predetermined target temperature for cooking the food.
Therefore, the cooking quality of fried cooking can be further improved.

The fourth feature configuration is in addition to any one of the first to third feature configurations,
There is provided a preheater that preheats the superheated steam generation water by exchanging heat between the exhaust steam discharged from the superheated steam flow section and the superheated steam generation water supplied to the superheated steam generation device. There is in point.

According to the above characteristic configuration, the preheater exchanges heat between the exhaust steam discharged from the superheated steam passage and the water for superheated steam generation supplied to the superheated steam generation apparatus, and supplies the heat to the superheated steam generation apparatus. Water for generating superheated steam is preheated.
That is, since a part of the heat discarded by the exhaust steam discharged from the superheated steam flow section can be recovered and the water for generating the superheated steam can be preheated, the heating efficiency can be further improved.

Diagram showing the overall structure of the flyer Block diagram showing fryer superheated steam generator and control configuration Longitudinal section of the main part of the flyer

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the fryer is divided into an oil tank 1 that contains cooking oil L, heating means H that heats cooking oil L in the oil tank 1, a control unit 2 that controls the operation of the fryer, An operation unit 3 for instructing control information and a display unit 4 (for example, a liquid crystal display) for displaying various information such as an operating state of the fryer are configured. Although not shown, the operation unit 3 includes an operation switch for instructing start and stop of the fryer, a temperature setting unit for setting a heating target temperature that is a target temperature for heating the cooking oil L in the oil tank 1, and the like. ing.

As shown in FIGS. 1 and 3, the oil tank 1 is formed in a container shape having a square shape in plan view and an upper part opened substantially over the whole, and the oil tank 1 is an upper part of an outer casing 5 that forms an outer packaging of a fryer. It is assembled to the outer casing 5 in a state of being supported suspended from the edge of the opening.
The oil tank 1 has an upper portion 1u on the upper side formed in a square tube shape having a square cross-sectional shape and a constant cross-sectional area, and a bottom portion 1b on the bottom side having a square cross-sectional shape and a cross-sectional area. Is formed in a truncated quadrangular pyramid-like vessel shape that becomes narrower toward the lower side, and is configured to be constricted as a whole.
A tubular oil discharge port 6 for discharging cooking oil L is provided at the bottom of the oil tank 1, and an oil discharge cock 7 that can open and close the oil discharge port 6 is provided at the oil discharge port 6. Yes.

  A rising portion 5s that rises upward is provided at the rear end of the upper portion of the outer casing 5, and an operation panel 8 equipped with the operation portion 3 and the display portion 4 described above is provided on the rising portion 5s.

As shown in FIG.1 and FIG.2, in this invention, the heating means H is the superheated steam generator S which produces | generates the superheated steam Va, and the superheat which makes the superheated steam Va produced | generated by the superheated steam generator S flow. The superheated steam flow portion R is arranged in a state of covering the outer surface 1 s of the oil tank 1 over the entire circumference.
The superheated steam generator S includes a steam temperature adjusting unit C that can adjust the temperature of the generated superheated steam Va, and the steam temperature adjusting unit C sets the temperature of the superheated steam Va to the cooking oil L in the oil tank 1. It is configured to adjust to a temperature lower than the spontaneous ignition temperature.

Next, the superheated steam generator S will be described.
As shown in FIG.1 and FIG.3, the superheated steam flow part R is arrange | positioned in the state which covers the outer surface 1s of the upper part 1u of the oil tank 1 over a perimeter. Specifically, over the entire periphery of the side wall portion 1w that forms the outer side surface 1s of the upper portion 1u, the bowl-shaped flow portion forming member 9 applies the opening edge to the outer side surface 1s of the side wall portion 1w. In the state, it is attached to the side wall portion 1w in an airtight manner. And the superheated steam flow part R is comprised by the side wall part 1w of these upper part 1u, and the flow part formation member 9 in the shape of a square frame which covers the outer surface 1s of the upper part 1u of the oil tank 1 over the perimeter. .

Although details will be described later, when the superheated steam Va is supplied to the superheated steam flow portion R, the cooking oil L in the upper portion 1u of the oil tank 1 is heated intensively, and in the upper portion 1u. The deep-fried cooking zone Zf for deep-fried cooking ingredients (not shown) is formed, and the temperature of the cooking oil L is formed in the upper portion 1u in the bottom portion 1b of the oil tank 1. Lower cool zone Zc is formed.
That is, the superheated steam flow portion R is disposed so as to cover the upper portion of the outer surface 1 s of the oil tank 1, and the temperature of the cooking oil L is lower on the bottom side of the oil tank 1 than the upper portion 1 u. Zc is formed.
And the cooking oil temperature sensor 10 which detects the temperature of the cooking oil L of the fried cooking zone Zf in the oil tank 1 is provided as shown in FIG.2 and FIG.3.

  As shown in FIGS. 1 and 2, the superheated steam generator S heats the water W supplied through the water supply channel 18 by using a gas burner 31 as a heat source to generate saturated steam Vb, and its steam generation. And a superheated steam generator 40 that generates superheated steam Va by heating the saturated steam Vb supplied from the vessel 30 through the saturated steam path 11 using an electric heater 41 (an example of an electric heating unit) as a heat source. Yes.

As shown in detail in FIG. 2, the steam generator 30 includes a plurality of cylindrical smoke pipes 33 through which the combustion gas E of the gas burner 31 flows in a cylindrical furnace cylinder 32 closed at both ends. The shaft cores are arranged in a ring shape in a posture along the axis of the furnace tube 32.
The furnace tube 32 is arranged in a posture in which the axis is aligned in the horizontal direction, and a supply header 34 in which one end of each of the plurality of smoke tubes 33 communicates is provided at one end of the furnace tube 32. The other end portion is provided with a discharge header 35 in which the other ends of the plurality of smoke pipes 33 communicate with each other.
The gas burner 31 is provided so as to supply the combustion gas E to the supply header 34.

The gas burner 31 is connected to a fuel supply path 12 for supplying gas fuel (for example, natural gas-based city gas such as 13A) and an air supply path 14 for supplying combustion air by an air blower 13. The fuel supply path 12 is provided with a fuel interrupt valve 15 that intermittently supplies gas fuel to the gas burner 31 and a fuel supply amount adjustment valve 16 that adjusts the supply amount of gas fuel.
Further, a water supply path 18 for supplying water W by the feed water pump 17 is connected to the bottom of the furnace tube 32, and saturated steam for sending saturated steam Vb generated in the furnace tube 32 is connected to the upper part of the furnace tube 32. The path 11 is connected.

  That is, when the gas burner 31 burns and the combustion gas E flows through the plurality of smoke pipes 33, the water W in the furnace tube 32 is heated to generate saturated steam Vb, and the saturated steam Vb is saturated steam path. 11 is supplied to the superheated steam generator 40.

As shown in detail in FIG. 2, the superheated steam generator 40 is configured by disposing a U-shaped electric heater 41 on one end of the container 42 in a container 42 closed at both ends. Furthermore, a heater drive unit 43 that drives the electric heater 41 is also provided.
The other end of the saturated steam channel 11, one end of which is connected to the furnace tube 32 of the steam generator 30, is connected to the upper portion on one end side of the container 42.
That is, saturated steam Vb is supplied from the steam generator 30 into the container 42 through the saturated steam path 11, and the saturated steam Vb is heated by the electric heater 41 in the container 42, thereby generating superheated steam Va. Further, the electric power supplied to the electric heater 41 is adjusted by the heater driving unit 43 and the heating temperature of the electric heater 41 is adjusted, so that the temperature of the superheated steam Va generated by the superheated steam generator 40 is adjusted. Is done.

As shown in FIGS. 1 and 2, the superheated steam path for sending the superheated steam Va generated in the container 42 is disposed at the upper portion of the end of the container 42 opposite to the side where the saturated steam path 11 is connected. As shown in FIG. 3, the other end of the superheated steam passage 20 is connected to the superheated steam flow section R, and further, the superheated steam flow section R is connected to the superheated steam flow section R. An exhaust steam path 21 for discharging the exhaust steam Vc from the flow part R is connected.
As shown in FIG. 2, a superheated steam temperature sensor 22 that detects the temperature of the superheated steam Va flowing through the inside is provided at a portion of the superheated steam path 20 on the container 42 side.
Further, heat exchange is performed between the exhaust steam Vc discharged from the superheated steam flow section R and flowing through the exhaust steam path 21 and the superheated steam generation water W flowing through the water supply path 18 to generate the superheated steam. A preheater 23 for preheating the water W is provided.

Next, the control operation of the control unit 2 will be described.
The control unit 2 supplies the gas fuel to the gas burner 31 so that the temperature of the cooking oil L detected by the cooking oil temperature sensor 10 becomes the heating target temperature set by the temperature setting unit of the operation unit 3. In order to adjust the fuel supply amount adjustment valve 16, the supply amount of combustion air to the gas burner 31 is adjusted in accordance with the supply amount of gas fuel adjusted by the fuel supply amount adjustment valve 16. The blower 13 is controlled.
Further, the control unit 2 supplies the water W to the furnace tube 32 so that the detected water level of a water level sensor (not shown) that detects the water level of the water W in the furnace tube 32 becomes a preset water level. The feed water pump 17 is controlled to adjust the above.
Incidentally, the set water level is set to a predetermined water level in which a gas phase portion is formed in the upper part of the furnace tube 32 in a state where all the smoke pipes 33 are immersed.

The control unit 2 energizes the heater driving unit 43 so that the temperature of the superheated steam Va detected by the superheated steam temperature sensor 22 becomes a generation target temperature set to a temperature lower than the spontaneous ignition temperature of the cooking oil L. It is configured to adjust the power to be. Incidentally, when the spontaneous ignition temperature of the cooking oil L is about 350 ° C., the generation target temperature is set to 250 ° C., for example.
That is, the steam temperature adjustment unit C is configured by the control unit 2 and the heater driving unit 43.

Next, the operation mode of the fryer configured as described above will be described.
The water W supplied to the furnace tube 32 of the steam generator 30 through the water supply path 18 and stored in the furnace tube 32 is heated by the plurality of smoke pipes 33 in the furnace tube 32 to generate saturated steam Vb, The saturated steam Vb is supplied into the container 42 of the superheated steam generator 40 through the saturated steam path 11, and the saturated steam Vb is heated by the electric heater 41 in the container 42, so that the temperature of the cooking oil L is spontaneously ignited. Superheated steam Va adjusted to a generation target temperature lower than the temperature is generated.

The superheated steam Va thus generated is supplied from the container 42 through the superheated steam passage 20 to the superheated steam flow section R and flows through the superheated steam flow section R, so that the inside of the upper portion 1u in the oil tank 1 The cooking oil L in the fried cooking zone Zf is intensively heated, and a cool zone Zc in which the temperature of the cooking oil L is lower than that in the fried cooking zone Zf is formed in the bottom portion 1 b of the oil tank 1.
At this time, the combustion amount of the gas burner 31 is adjusted, and the supply amount of the superheated steam Va supplied to the superheated steam passage R is adjusted, whereby the temperature of the cooking oil L in the frying cooking zone Zf in the oil tank 1 is adjusted. Is adjusted to the heating target temperature.

The temperature of the superheated steam Va flowing through the superheated steam flow section R decreases as the cooking oil L is heated, and is discharged through the exhaust steam path 21 as exhaust steam Vc.
Then, in the preheater 23, the water W flowing through the water supply passage 18 is heated by the exhaust steam Vc flowing through the exhaust steam passage 21, whereby the superheated steam generation water W supplied to the steam generator 30. Is preheated.

That is, the superheated steam flow portion R is effectively disposed on the outer surface 1 s of the oil tank 1 by arranging the superheated steam flow portion R so as to cover the outer surface 1 s of the oil tank 1 over the entire circumference. Since it can arrange | position in a wide range, it becomes possible to heat the cooking oil L in the oil tank 1 over a wide range, and can improve a heating efficiency.
Further, since the temperature of the superheated steam Va supplied to the superheated steam flow section R is adjusted to be lower than the spontaneous ignition temperature of the cooking oil L in the oil tank 1, the oil tank 1 and the superheated steam flow section R are adjusted. Thermal fatigue can be effectively suppressed. This effectively suppresses thermal fatigue and reliably prevents the oil tank 1 and the superheated steam flow part R from cracking, while making the oil tank 1 and the superheated steam flow part R have high thermal conductivity. And it can comprise using an inexpensive material.
Therefore, spontaneous combustion of the cooking oil L in the oil tank 1 can be prevented while improving the fryer cleaning performance and heating efficiency and reducing the cost.

  Oil residue and food residue are collected at the bottom of the oil tank 1, but a cool zone Zc is formed on the bottom side of the oil tank 1 where the cooking oil L is lower in temperature than the fried cooking zone Zf on the upper side. Oil residue and food residue are hard to burn and deterioration of cooking oil L can be reduced.

[Another embodiment]
Next, another embodiment will be described.
(A) The arrangement form of the superheated steam flow portion R arranged so as to cover the outer surface 1 s of the oil tank 1 over the entire circumference is the form illustrated in the above embodiment, that is, the outer surface 1 s of the upper portion 1 u of the oil tank 1. Is not limited to the arrangement form covering the entire circumference. For example, the arrangement | positioning form which covers the whole outer surface 1s of the oil tank 1 may be sufficient. Moreover, in addition to the part of the state which covers the outer surface 1s of the oil tank 1 over the whole periphery, you may add the part of the state which covers the outer surface of the bottom part of the oil tank 1 as the superheated steam flow part R.

(B) When the superheated steam generator S is configured to include the steam generator 30 and the superheated steam generator 40, the heat source of the steam generator 30 and the heat source of the superheated steam generator 40 are exemplified in the above embodiment. The heat source is not limited to the above. For example, instead of the gas burner 31 of the above embodiment, an electric heating unit such as an electric heater may be used as the heat source of the steam generator 30. Further, as a heat source of the superheated steam generator 40, a burner such as a gas burner may be used instead of the electric heater 41 of the above-described embodiment.
Moreover, in said embodiment, although the steam generator 30 and the superheated steam generator 40 were comprised separately, you may comprise integrally.

(C) In the superheated steam flow section R, a flow guide member for flowing the superheated steam Va in a meandering manner is provided, and the flow path of the superheated steam Va in the superheated steam flow section R is lengthened. Also good. Thereby, the heating efficiency can be further improved.

(D) The shape of the oil tank 1 is not limited to the shape exemplified in the above-described embodiment, that is, the shape in plan view is constricted in the forward direction. For example, the planar view shape may be rectangular or circular. And the superheated steam flow part R is arrange | positioned in the state which covers at least the outer surface 1s over the perimeter among the outer peripheral surfaces of the oil tank 1 according to the shape of the oil tank 1. FIG.

  As described above, it is possible to provide a fryer that can prevent spontaneous combustion of cooking oil in an oil tank while improving cleanability and heating efficiency and reducing the cost.

DESCRIPTION OF SYMBOLS 1 Oil tank 1s outer surface 23 Preheater 30 Steam generator 31 Gas burner (burner)
40 Superheated steam generator 41 Electric heater (electric heating unit)
C Steam temperature adjusting part H Heating means L Cooking oil R Superheated steam flow part S Superheated steam generator Va Superheated steam Vb Saturated steam Vc Waste steam W Water Zc Cool zone

Claims (4)

A fryer provided with an oil tank for containing cooking oil and a heating means for heating the cooking oil in the oil tank,
The heating means includes a superheated steam generator that generates superheated steam, and a superheated steam flow section that flows the superheated steam generated by the superheated steam generator,
The superheated steam flow portion is arranged in a state of covering the entire outer surface of the oil tank,
The superheated steam generator includes a steam temperature adjustment unit capable of adjusting the temperature of the superheated steam to be generated,
The said fryer is comprised so that the said steam temperature adjustment part may adjust the temperature of the said superheated steam to temperature lower than the spontaneous ignition temperature of the cooking oil in the said oil tank.   The superheated steam flow part is disposed so as to cover the upper part of the outer surface of the oil tank, and a cool zone in which the cooking oil temperature is lower than that of the upper part is formed on the bottom side of the oil tank. The flyer according to claim 1. The superheated steam generator heats supplied water using a burner as a heat source to generate saturated steam, and heats saturated steam supplied from the steam generator using an electric heating unit as a heat source. And a superheated steam generator for generating superheated steam,
The fryer according to claim 1 or 2, wherein the steam temperature adjusting unit is configured to adjust a temperature of the superheated steam by adjusting electric power supplied to the electric heating unit.   There is provided a preheater that preheats the superheated steam generation water by exchanging heat between the exhaust steam discharged from the superheated steam flow section and the superheated steam generation water supplied to the superheated steam generation device. The fryer according to any one of claims 1 to 3.

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