JPH11299658A - Empty burning preventing device of fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent empty burning abnormality by detecting a surface overheat abnormality of a heating tube heated by combustion gas through a heat transfer member by a thermostat and stopping burning of the burner when an empty burning occurs. SOLUTION: A combustion chamber 16 of a pulse burner 14 and a tail pipe 18 are provided in an oil tank 12, on the uppermost surface of the tail pipe 18, which is a bent part most subjected to red heat at the time of empty burning, a heat transfer plate 42 is installed in the state of piercing the tank wall surface of the oil tank 12, and the piercing end is provided with a thermostat 46. The thermostat 46 detects oil temperature when the oil tank 12 is full of edible oil, and on the other hand, when empty burning, it detects red heat of the tail pipe 18. The thermostat 46 is operated on detecting the red heat to stop the burning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing empty firing of a fryer, and more particularly, to a pulse combustion fryer having a combustion chamber of a pulse combustor and a tail pipe in an oil tank, and a heating apparatus disposed in the oil tank. Of a submerged fryer equipped with a submerged pipe and a burner for supplying a high-temperature combustion gas to the heated submerged pipe, etc. It relates to a prevention device.

[0002]

2. Description of the Related Art Conventionally, a flyer of this type is provided with a heating pipe such as a tail pipe or a heating immersion pipe in an oil tank, and is provided with a heating means such as a pulse combustor or a burner. The cooking oil is heated, the ingredients to be cooked are immersed in cooking oil such as tempura oil in the oil tank, heated and cooked, and fried foods and the like are prepared.

In such a case, the cooking oil in the oil tank is occasionally transferred to a filtering tank to remove oil residues, etc.
It is returned to the oil tank and reused, but the oil in the oil tank may flow down to the filtering tank without the cook's notice during use, or it may be fired empty by forgetting to return the oil from the tank to the oil tank. is there.

[0004] Therefore, measures to prevent such empty heating are required. As a means, an oil level detection sensor such as a float switch type, an electrode type, a capacitance type, a sound wave detection type, and an optical detection type is used. It is conceivable to provide an oil tank and confirm that there is a predetermined level of oil in the oil tank based on the detection signal, and then perform a combustion ignition operation.

Also, for example, Utility Model Registration No. 25237
As shown in Japanese Patent No. 28, focusing on the fact that an oil tank is provided with a cooking oil temperature detection sensor, the oil temperature detection sensor detects the temperature rise rate of the cooking oil, and the oil level is determined by the temperature rise rate. It has been proposed to prevent empty heating by making a judgment.

[0006]

However, in the former method in which an oil level detection sensor such as a float switch is provided in the oil tank, the oil in the oil tank is repelled by, for example, input of foodstuffs, and the oil in the oil tank is applied to the float, electrode, optical lens, or the like. There is a problem that it causes adhesion and causes malfunction. In addition, there is also a problem that the cost of the product is increased by providing an oil level detection sensor for detecting the oil level in addition to the oil temperature detection sensor for detecting the oil temperature of the edible oil.

[0007] In the latter Japanese Utility Model Registration No. 2523728, in which the temperature rise rate of the oil is detected based on a detection signal from the oil temperature detection sensor to prevent idling, an oil level detection sensor is separately provided. Since it is not necessary to provide it, the product cost can be reduced accordingly, but the response is poor because it does not directly detect the temperature of the heating tube in the empty heating state, and the cooking oil in the oil tank is poor. There was a problem that it was not possible to detect accurately even in a state where it was not present at all.

[0008] Therefore, the present inventors, when the heating tube is exposed from the oil level, even if the oil temperature is 180 ° C,
Paying attention to the fact that the exposed heating tube glows red and shows 600 ° C, it detects the temperature of the oil when there is enough oil in the oil tank, and detects the temperature of the glowing heating tube when it is empty. I wondered if I could do that.

[0009] The problem to be solved by the present invention is that in an apparatus for preventing an empty firing of a flyer, not only the temperature of the oil is detected, but also at the time of the empty firing, the state of the empty firing is detected at an early stage, and the safety in use of the equipment is improved. It is an object of the present invention to provide an apparatus for preventing an empty firing of a flyer, which can ensure the following.

[0010]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a fryer for heating edible oil filled in an oil tank by heat of combustion exhaust gas flowing through a heating pipe provided in the oil tank. In the firing prevention device, the heating pipe is provided with a heat transfer member that normally senses the oil temperature of the edible oil filled in the oil tank and senses the temperature of the heating pipe during idle heating, and detects the temperature of the heat transfer member. The gist of the present invention is to provide a temperature detecting means.

According to the apparatus for preventing the fryer from being fired according to the present invention having the above-described structure, when the oil in the oil tank is sufficient in the use state of the fryer, the oil temperature is detected by the temperature detecting means via the heat transfer member. On and off control is performed so that the oil temperature is maintained at an appropriate temperature, but when the oil in the oil tank is small and a part of the heating pipe is exposed from the oil level,
Alternatively, in the idling state, the surface temperature of the heating tube is detected by the temperature detecting means via the heat transfer member, and the combustion of the flyer is stopped when the temperature exceeds the oil temperature management temperature.

Further, as described in claim 2, furthermore,
If an alarm is provided to notify the state when the temperature detection means detects the empty-fired state, the cook is immediately notified of the empty-fired state, so that quick response is possible.

In this case, it is preferable that the heat transfer member has a heat radiation characteristic, and a material having excellent heat conductivity such as brass, copper or aluminum material is preferable. As a result, not only the oil temperature detection but also the responsiveness of the air-fired detection becomes very good. The temperature detecting means is preferably a thermostat such as a bimetal switch.

The heat transfer member provided on the heating tube is:
It is preferable to penetrate the tank wall of the oil tank and to provide the thermostat outside the oil tank. By doing so, the thermostat is not directly immersed in the oil in the oil tank, and the oil does not adhere to or adhere to the thermostat.
Maintenance becomes easy.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2
FIG. 1 shows a schematic configuration of a pulse combustion flyer 10 to which the present invention is applied. FIG. 1 is a side view thereof, and FIG. 2 is a top view thereof.

As shown in the figure, the pulse combustion fryer 10 has a pulse combustion chamber 16 and a U-shaped bent portion connected to the pulse combustion chamber 16 at the inner bottom of an oil tank 12 for heating and cooking the food to be cooked. The pulse combustor 14 including the formed tail pipe 18 is provided.

On the bottom wall of the oil tank 12, the oil tank 1
An oil drain pipe 20 for extracting the cooking oil in 2 is provided,
An oil drain valve 22 provided on the oil drain pipe 20 has an oil drain valve lever 24 for opening and closing the oil drain valve 22.
Have been repeated.

An oil tank 28 for collecting edible oil discharged from the oil drain port 26 is disposed below the oil drain port 26 of the oil drain pipe 20. A filter 30 is provided for filtering oil residues and the like contained in the oil.

Further, an oil supply port 32 is provided on a tank wall surface of the oil tank 12, and the oil supply port 32 and the oil tank 28 are connected via an oil supply pipe 34. The oil supply pipe 34 is provided with an oil pump 36 for returning edible oil whose oil residue or the like has been filtered by the filter 30 in the oil tank 28 to the oil tank 12, and an oil supply valve provided on the oil supply pipe 34. An oil supply valve lever 40 for opening and closing the oil supply valve 38 is continuously connected to 38.

A thickness of 15 mm.times. Is formed along the bent portion of the tail pipe 18 provided in the oil tank 12.
A heat transfer plate 42 made of a brass plate having a width of 10 mm is attached by a band 44, and the other end of the heat transfer plate 42 is inserted through the tank wall surface of the oil tank 12. A bimetal thermostat 46 that is turned on and off is provided.

As shown in FIG. 3, the operation switch section of the pulse combustion fryer 10 includes a power switch 48 of the fryer and an upper limit position (draft line) on the oil level in the oil tank 12 as shown in FIG.
A high limit test switch 50 for detecting L and a temperature setting knob 52 for setting the oil temperature in the oil tank 12 are provided.
It is configured to control the combustion of the flyer, perform a high limit test, and set the oil temperature.

The operation switch section is provided with a combustion lamp 54, an abnormal lamp 56, and a thermo lamp 58 so that the cook can confirm the operation state of the pulse combustion fryer 10 by looking at the display. It is configured. In addition, the apparatus is provided with an abnormal buzzer (not shown) so that an alarm is generated intermittently with the blinking of the abnormal lamp.

Further, although not shown, a CPU for controlling the operation of the pulse combustion flyer 10 is provided inside the pulse combustion flyer 10.
(Central processing unit) and RO containing control program
M (read only memory), RA for storing various control data
M (temporary storage memory) and a data transfer interface are built in. The CPU sends a control command to each unit of the device according to a program read from the ROM, and performs a process according to a data value output from each unit of the device. The input side of the CPU is connected to a high limit test switch 50, a thermostat 46, various switches, an oil temperature setting terminal, and the like, and the output side includes various solenoid valves, a fan motor, various buzzers / lamps, and the like. It is connected.

The pulse combustion fryer 10 having the above-described configuration loads edible oil into the oil tank 12 and
When 8 is inserted, the pulse combustor 14 starts burning. The temperature of the edible oil in the oil tank 12 is transmitted to the thermostat 46 via the heat transfer plate 42, and the temperature of the edible oil becomes 1
By performing on / off switching control in the range of 60 ° C to 210 ° C, the food to be cooked is cooked at a constant temperature,
The fried food is ready.

When the oily scum accumulates in the cooking oil during cooking, or when the cooking oil filtering switch in the oil tank 12 is turned on after cooking, the pulse combustor 1 is turned on.
4 automatically stops the combustion. The edible oil in the oil tank 12 is dropped into the oil tank 28 by pulling the oil drain valve lever 24 and opening the oil drain valve 22.

Then, after cleaning the inside of the oil tank 12, the oil drain valve lever 24 is pushed to close the oil drain valve 22, and then the oil drain valve 22 is closed.
When the oil supply valve lever 40 is pulled, the oil supply valve 38 of the oil supply pipe 34 that returns from the oil tank 28 to the oil tank 12 is opened, and at the same time, the oil pump 36 is started, and the filter 30 in the oil tank 28 is started.
The edible oil filtered by the above is returned to the oil tank 12 from the oil supply port 32. When all the edible oil in the oil tank 28 returns to the oil tank 12, the fuel supply valve 38 is closed and the filtering switch is turned off, and the burner (the pulse combustor 14) starts burning again.

Next, the idle-burn prevention control of the pulse combustion flyer 10 configured as described above will be described in more detail with reference to the flowcharts of FIGS. First, FIG.
When the power switch 48 of the pulse combustion fryer 10 is turned on (S1 to S3) as shown in (1), an initial inspection operation is started, and whether or not the high limit test switch 50 and the overheat prevention device are in an operable state ( S4) is determined. The operating state of the high limit test switch 50 is determined by checking whether the oil temperature exceeds 220 ° C. to determine whether or not the high limit test switch 50 is in a normal operating state. It is confirmed via 42 whether the oil temperature or the surface temperature of the tail pipe 18 is in a state of normal operation at 190 ° C.

Next, whether or not the thermistor is normal (S5)
Is performed, and after it is confirmed that the temperature is equal to or lower than a predetermined set temperature (the normal oil temperature management temperature is 180 ° C. or higher), the thermo lamp 58 is turned on, and although not shown, pulse combustion is performed. The fan motor of the heater 14 is driven to rotate (S6 to S8).

Then, the main solenoid valve and the main solenoid valve of the gas burner provided in the pulse combustion chamber 16 are sequentially opened, the combustion gas is supplied to the gas burner, and then the ignition of the gas burner is performed by the igniter (S9 to S11). The flame of the gas burner is detected within a predetermined time (S12:
If "YES"), the combustion lamp is turned on (S13), and the ignition operation ends (S14). If the safety device does not operate due to the occurrence of the abnormality (S15: “NO”), unless the temperature exceeds the set oil temperature by the temperature detection through the heat transfer plate 42 in the oil tank 12 by the thermostat 46 (S16:
“NO”), the safe combustion control is performed.

Then, the oil temperature in the oil tank 12 exceeds the set temperature according to the detection signal from the thermostat 46 (S16:
If it is determined to be "YES"), after the original gas solenoid valve, the gas solenoid valve is turned off, the combustion lamp 54 and the thermostat 56 are turned off (S17), the oil temperature is kept at a constant temperature by turning on / off the fan (S17). The combustion control is performed so that the temperature is maintained at about 180 ° C. (S18, S19).

On the other hand, in step S15, when the safety device operates, the thermistor disconnection abnormality (S2
1), a high limit abnormality (S22), an overheat prevention device abnormality (S23), and the like. When these abnormalities are detected (S15: YES), the original gas solenoid valve and the gas solenoid valve are also turned off. After the combustion lamp 54 and the thermo lamp 58 are turned off (S24), the fan motor is driven to rotate the fan to cool the air (S25), the abnormal lamp 56 is turned on, and the abnormal buzzer is interrupted (S26). The driving of the motor is stopped to stop the fan (S27).

For example, when the cooking oil is not enough in the oil tank 12 and it is in an idling state, the tail pipe 18 is heated red by about 5 to 5 due to the idling combustion by the pulse combustor 14.
The temperature reaches about 00 ° C., and the heat is transmitted to the thermostat 46 via the heat transfer plate 42. And the thermostat 46
When it is determined that the overheating has occurred due to the idling by the operation of (S23), the main solenoid valve and the original solenoid valve are closed, and the thermo lamp and the combustion lamp are turned off (S24).
Combustion is stopped. Then, the fan is rotated for 5 seconds to ventilate (S25), and then the abnormal buzzer is activated and the abnormal lamp is blinked (S26) to notify the cook of the occurrence of the abnormality. Thereafter, the rotation of the fan is stopped (S27).

If it is determined in step S4 that the high limit test switch or the overheat prevention device is not operating normally (S4: "NO"), the abnormal lamp 56 is turned on, and the abnormal condition is detected by the cook. The abnormal buzzer that informs the occurrence intermittently sounds (S30), and there is no simulated flame on the frame rod in step S10 (S10:
If "NO", the abnormal lamp 56 is turned on and an intermittent alarm is generated by the abnormal buzzer (S30), and after the thermo lamp 58 is turned off (S31), the fan is turned off (S32). Further, in step S12, when ignition of the gas burner fails (S12: "N
O ”) also, after the original gas solenoid valve and the gas solenoid valve are turned off and the igniter is turned off (S33), the abnormal lamp 56 is turned on, the intermittent warning by the abnormal buzzer, and the thermo lamp 5
8 is turned off (S34), the drive by the fan motor is stopped, and the rotation of the fan is stopped (S35).

As described above in the embodiment, according to the pulse combustion fryer 10, when the oil tank 12 has plenty of edible oil, the safety device operates normally and the oil temperature exceeds the set temperature. Thermostat 4 not to exceed
6, and the on / off control of the gas burner is performed based on the detection signal, and cooking is performed in a state where the oil temperature is maintained at the set temperature.

For example, when it is determined that the oil tank 12 is not filled with edible oil, the safety device is activated, and the surface temperature of the abnormally heated tail pipe 18 is thermostatted via the heat transfer plate 42. Since the detection is performed at 46, at that time, the operation of stopping the combustion is activated, and the combustion of the gas burner is safely stopped.

Thus, according to the pulse combustion fryer 10 to which the apparatus for preventing dry burning according to the present invention is applied, when the oil tank 12 is filled with edible oil, the oil temperature is detected by the thermostat 46 and the oil temperature is detected. If the control is performed, and if the air-heating state occurs, the red heat temperature of the tail pipe 18 is also detected by the thermostat 46 and the combustion is stopped, so that the safety in using the appliance is high.

Further, since an abnormality in the empty heating state is notified to the cook by an abnormal buzzer or an abnormal lamp, the abnormal abnormality in the empty heating can be quickly detected and promptly dealt with.
In addition, since the thermostat that detects an empty firing abnormality is provided outside the oil tank, sticking and adhesion of oil are avoided,
Accurate operation to prevent empty heating is ensured. In addition, inspection work and replacement work of the thermostat can be easily performed.

Although the embodiments have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various design changes are possible. For example, the apparatus for preventing an empty firing of a fryer according to the present invention is not only a pulse combustion type fryer using a tail pipe as a heating tube,
The present invention is also applicable to a immersion tube type flyer in which a heating immersion tube provided in an oil tank is used as a heating tube. Similar effects can be obtained by using a heat transfer rod instead of the heat transfer plate. The thermostat may be provided on any tank wall outer surface of the oil tank.

[0039]

According to the apparatus for preventing fryer from being fired in accordance with the present invention, not only can the temperature of the edible oil in the oil tank be controlled, but also in the event that an air-fired abnormality occurs, the heating pipe heated by the combustion gas can be used. Since the surface overheating abnormality is detected by the thermostat via the heat transfer member and the combustion of the burner is stopped, the abnormal burning abnormality is effectively prevented. Further, it is more effective if the cooker is notified of the empty firing abnormality by a buzzer, a lamp, or the like. Thus, safety in use of the flyer can be ensured.

Also, in the present invention, the temperature of the oil in the oil tank is detected during normal operation by the thermostat for detecting an abnormal firing, so that it is not necessary to separately provide a temperature sensor, and the production cost is increased. There is also an effect that can be avoided.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a pulse combustion flyer according to an embodiment of the present invention.

FIG. 2 is a top view of the pulse combustion type flyer shown in FIG.

FIG. 3 is a diagram showing an operation unit for controlling empty firing prevention of the pulse combustion fryer shown in FIG. 1;

FIG. 4 is a control flowchart for preventing empty burning of the pulse combustion flyer in this embodiment.

FIG. 5 is a diagram showing a continuation of the control flowchart shown in FIG. 4;

[Explanation of symbols]

 Reference Signs List 10 pulse combustion flyer 12 oil tank 14 pulse combustor 16 pulse combustion chamber 18 tail pipe 42 heat transfer plate 46 thermostat 56 abnormal lamp 58 thermo lamp

Claims (2)

[Claims] 1. An apparatus for preventing an unburned fryer from heating edible oil filled in an oil tank by the heat of combustion exhaust flowing through a heating pipe disposed in an oil tank, wherein the heating pipe is usually filled with an oil tank. A heat transfer member for sensing the oil temperature of the edible oil to be sensed and detecting the temperature of the heating tube during idle firing, and a temperature detecting means for detecting the temperature of the heat transfer member. Prevention device. 2. The apparatus according to claim 1, further comprising alarm means for notifying when the temperature detection means detects an empty firing state.