Flyer

Abstract

To appropriately detect a position of an oil level in either of two cooking modes.SOLUTION: A flyer 1 includes: a first oil level temperature sensor 11 which is arranged below an oil level position in a first rated oil amount in an oil tank 3 and detects a temperature of the cooking oil; a second oil level temperature sensor 12 which is arranged above the oil level position in the oil tank 3 and detects the temperature of the cooking oil; and an oil increase opening / closing detection part 55 and an oil supply opening / closing detection part 56 which detect oil increase by oil increasing means and oil decrease by oil decreasing means. A burner controller 70 detects an oil level position on the basis of the detection temperature of the first oil level temperature sensor 11 when oil increase operation by the oil increasing means is not detected by the oil increase opening / closing detection part 55, and detects the oil level position on the basis of the detection temperature of the second oil level temperature sensor 12 when the oil increase operation by the oil increasing means is detected by the oil increase opening / closing detection part 55.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a commercial fryer that heats cooking oil in an oil vat and cooks food by placing it in the oil vat. [Background technology]

[0002] The fryer heats cooking oil contained in an oil vat to a predetermined cooking temperature using heating means such as a burner or a pulse burner, thereby cooking foods such as potatoes placed in the oil vat. As disclosed in Patent Document 1, the oil vat is provided with an oil level thermistor that detects the position of the oil level, in addition to a temperature control thermistor for controlling the temperature of the cooking oil. When the cooking oil level drops below the oil level thermistor, the temperature detected by the oil level thermistor drops, so the fryer's control means detects the height of the oil level by monitoring the temperature detected by the oil level thermistor, and when the oil level falls below an allowable height, issues an error notification or stops cooking to prevent empty cooking. Meanwhile, as disclosed in Patent Document 2, there is known a fryer that can execute a first cooking mode in which the heating means is controlled at a predetermined first heat amount when the cooking oil contained in the oil vat is a predetermined rated oil amount and the food to be cooked is a predetermined first rated amount, and a second cooking mode in which the heating means is controlled at a predetermined second heat amount greater than the first heat amount when the cooking oil is increased above the rated oil amount and the food to be cooked is a predetermined second rated amount greater than the first rated amount. Increasing the oil amount from the rated amount is performed by refilling the cooking oil from an oil refill tank provided behind the oil vat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-120291 A [Patent Document 2] JP 2020-22577 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a fryer that performs two cooking modes with different amounts of oil as in Patent Document 2, even if the oil amount is increased from the rated amount, a single oil level thermistor cannot detect the increased oil amount. This also applies when the oil amount is reduced from the increased oil amount to the rated amount. Therefore, it is conceivable to provide two oil level thermistors above and below the rated oil level position. However, for example, if a cook manually opens the valve from the oil tank to increase oil at any time, or if a cook manually opens the valve on the oil tank to reduce oil at any time, the control means will not be able to detect the oil increase or decrease state, and therefore it will be impossible to detect the appropriate oil level position in the second cooking mode and the first cooking mode.

[0005] Therefore, an object of the present disclosure is to provide a fryer that can appropriately detect the position of the oil level in either of two cooking modes. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides an oil tank capable of storing cooking oil, An oil supply means capable of supplying cooking oil to the oil tank; An oil reducing means capable of reducing cooking oil from the oil tank; A heating means provided in the oil tank for heating cooking oil; A control means for controlling the heating means, The control means is capable of executing a first cooking mode in which the heating means is controlled with a predetermined rated oil amount that is not increased by the oil increasing means to heat-cook the food to be cooked, and a second cooking mode in which the heating means is controlled with the oil increased by the oil increasing means to heat-cook the food to be cooked, a first oil surface temperature sensor disposed in the oil vat below an oil surface position at the rated oil amount to detect a temperature of the cooking oil; A second oil surface temperature sensor is disposed in the oil vat above the oil surface position to detect the temperature of the cooking oil. further comprising an increase / decrease oil detection means for detecting an oil increasing operation by the oil increasing means and an oil decreasing operation by the oil decreasing means; When the control means does not detect the oil increasing operation of the oil increasing means by the increase / decrease oil detection means, the control means detects the position of the oil level based on the detected temperature of the first oil level temperature sensor, and when the increase / decrease oil detection means detects the oil increasing operation of the oil increasing means, the control means detects the position of the oil level based on the detected temperature of the second oil level temperature sensor. In another aspect of the present disclosure, in the above configuration, when the control means is detecting the position of the oil level based on the detected temperature of the second oil level temperature sensor, and the decrease oil operation of the oil decreasing means is detected by the increase / decrease oil detection means, the control means switches to detecting the position of the oil level based on the detected temperature of the first oil level temperature sensor. In another aspect of the present disclosure, in the above configuration, the oil increasing means includes an oil increasing tank capable of storing a predetermined amount of cooking oil, an oil increasing pipe connected from the oil increasing tank to the oil tank, and an oil increasing opening / closing means capable of opening and closing the oil increasing pipe manually. The increase / decrease oil detection means detects the presence or absence of an oil increasing operation based on the open / closed state of the oil increasing opening / closing means. In another aspect of the present disclosure, in the above configuration, the oil decreasing means includes a filtering tank for filtering the cooking oil in the oil tank, a feed pipe connecting the filtering tank and the oil increasing tank, a pump provided in the feed pipe, a feed opening / closing means capable of opening and closing the feed pipe manually, and an overflow path for guiding the cooking oil overflowing from the oil increasing tank to the oil tank. The increase / decrease oil detection means detects the presence or absence of an oil decreasing operation based on the open / closed state of the feed opening / closing means.

Advantages of the Invention

[0007] According to the present disclosure, the oil surface temperature sensor that detects the position of the oil surface automatically switches to the second oil surface temperature sensor in conjunction with the cooking oil refilling operation, so that the appropriate oil surface position can be detected when the cooking oil is refilled. Therefore, it is possible to reliably detect whether an appropriate amount of cooking oil is stored in the oil vat for cooking in the second cooking mode. In addition, since the cook does not need to switch the oil surface temperature sensor, no extra burden is imposed. According to another aspect of the present disclosure, when the oil level position is detected based on the temperature detected by the second oil level temperature sensor and the oil increase / decrease detection means detects the oil reduction operation of the oil reduction means, the control means switches to detection of the oil level position based on the temperature detected by the first oil level temperature sensor. Thus, in addition to the above effects, it is possible to detect the appropriate oil level position when the cooking oil is reduced, and it is possible to reliably detect whether an appropriate amount of cooking oil is stored in the oil vat for cooking in the first cooking mode, making it possible to prevent empty-burning, etc. According to another aspect of the present disclosure, the oil replenishing means includes an oil replenishing tank capable of storing a predetermined amount of cooking oil, an oil replenishing pipe connected from the oil replenishing tank to the oil tank, and an oil replenishing open / close means capable of manually opening and closing the oil replenishing pipe, and the oil replenishing / decreasing detection means detects the presence or absence of an oil replenishing operation based on the open / close state of the oil replenishing open / close means. Thus, in addition to the above effects, the control means can reliably detect the manual oil replenishing operation and switch the oil surface temperature sensor. According to another aspect of the present disclosure, the oil reduction means includes a filtering tank for filtering the cooking oil in the oil tank, an oil supply pipe connecting the filtering tank and the oil tank, a pump provided in the oil supply pipe, an oil supply opening / closing means for manually opening and closing the oil supply pipe, and an overflow path for leading the cooking oil overflowing from the oil tank to the oil tank, and the oil increase / decrease detection means detects the presence or absence of an oil reduction operation based on the open / close state of the oil supply opening / closing means. Thus, in addition to the above effects, the control means can reliably detect a manual oil reduction operation and switch the oil surface temperature sensor. [Brief description of the drawings]

[0008] [Figure 1] FIG. [Diagram 2] FIG. 1 is a schematic diagram of a fryer. [Diagram 3] FIG. 2 is an explanatory diagram of an operation panel. [Figure 4] (A) shows the cooking oil storage state in the first cooking mode, and (B) shows the oil storage state in the second cooking mode. [Diagram 5] (A) shows cooking oil being dropped into the filtering tank, and (B) shows cooking oil overflowing from the oil tank. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a perspective view showing an example of a fryer, and Fig. 2 is a schematic diagram of the fryer. This fryer 1 is provided with a pair of left and right oil vats 3, 3 in the upper part of a vessel body 2. A pair of left and right pulse combustors 4, 4 serving as heating means is provided at the bottom of each oil vat 3. Each pulse combustor 4 has a combustion chamber 5 provided on the inner wall at the front of the oil vat 3, and a tail pipe 6 connected to the combustion chamber 5 and routed in a serpentine manner within the oil vat 3. Since the configurations of the oil tanks 3 and their combustion and exhaust systems are the same on the left and right, the following description will mainly focus on the oil tank 3 on the left side of FIG.

[0010] The oil vat 3 has a first cooking section 7 and a second cooking section 8. The first cooking section 7 is formed above the pulse burner 4, and is a square tube with an opening area that does not change in the vertical direction. The second cooking section 8 is located above the first cooking section 7, and is formed in an inverted taper shape that widens in all directions as it moves upward from the top end of the first cooking section 7. The section up to the top end of the second cooking section 8 serves as a storage section for cooking oil. A basket 9 containing food to be cooked, such as potatoes, can be placed in the oil vat 3. A net 10 for receiving the basket 9 is provided above the pulse burners 4, 4. A first oil surface temperature sensor 11 is provided near the upper end surface of the first cooking section 7. A second oil surface temperature sensor 12 is provided near the upper end surface of the second cooking section 8. A cooking temperature sensor 13 is provided in the oil vat 3 near the tail pipe 6 of the pulse burner 4. A thermistor is used for each temperature sensor. An electric heater 33 is provided on the outer circumferential surface of the lower part of the oil vat 3.

[0011] An oil booster tank 14 for storing cooking oil is provided at the top of the vessel 2 behind the oil vat 3. An oil booster pipe 15 is connected to the bottom of the oil booster tank 14, which is connected to the second cooking section 8 at the rear of the oil vat 3. The oil booster pipe 15 is provided with an oil booster valve 16 that can be manually opened and closed. The oil booster valve 16 is provided with an oil booster open / close detector (e.g., a reed switch) 55 that detects the open / closed state. An oil booster temperature sensor 17 is provided inside the oil booster tank 14 to detect the temperature of the cooking oil contained therein. An overflow section 18 is provided on the front surface of the fuel tank 14. The overflow section 18 is formed by a pipe connected to the front surface of the fuel tank 14, a flow path formed in the vertical direction to the front surface of the fuel tank 14, etc. The upper end of the overflow section 18 is connected to an opening formed in the upper front surface of the fuel tank 14 and hangs down, and the lower end of the overflow section 18 is connected to the rear inner surface of the oil tank 3 via an outlet 19. Therefore, when the cooking oil in the fuel tank 14 exceeds the lower edge of the opening, the overflowed cooking oil flows from the outlet 19 down along the rear inner surface of the oil tank 3 into the oil tank 3.

[0012] An air chamber 20 is provided on the outside of the front side of the oil tank 3. A mixing chamber (not shown) communicating with the combustion chamber 5 is provided inside the air chamber 20. A gas conduit 21 equipped with a gas solenoid valve 22 is connected to the mixing chamber to supply fuel gas. An air supply pipe 23 is also connected to the mixing chamber. The air supply pipe 23 is connected to a fan 24 provided at the bottom of the vessel body 2 to supply combustion air. The tail pipes 6, 6 of the pulse combustors 4, 4 are arranged in a serpentine shape below the oil tank 3, and then connected to exhaust pipes 25, 25 drawn out from the air chamber 20. These exhaust pipes 25, 25 have mufflers 26, 26 arranged at the rear of the vessel body 2. The mufflers 26, 26 are arranged facing upward while in contact with the rear surface of the fuel tank 14, and are capable of discharging the combustion exhaust gas. The fuel tank 14 and the mufflers 26, 26 are covered by an exhaust pipe cover 27 provided on the body 2. A protective cover 28 is provided on the front of the left and right exhaust pipe covers 27, 27. Basket hangers 29, 29 for suspending and supporting the baskets 9, 9 are fixed to the protective cover 28. The outlet 19 of the overflow section 18 is provided below the basket hanger 29.

[0013] A filtering tank 30 with a filter at the bottom is provided at the bottom of the vessel 2. An oil drain pipe 31 is connected to the bottom of the oil vat 3, and cooking oil in the oil vat 3 can be drained through the oil drain pipe 31 to the filtering tank 30. The oil drain pipe 31 is provided with an oil drain valve 32 that can be opened manually. A filtering pump 35 is provided at the bottom of the device body 2. The suction side of the filtering pump 35 is connected to the bottom of the filtering tank 30 via a suction pipe 36. The discharge side of the filtering pump 35 branches into a first fuel supply pipe 37 and a second fuel supply pipe 38. The first fuel supply pipe 37 is connected to the fuel supply pipe 15 upstream of the fuel supply valve 16. The first fuel supply pipe 37 is provided with a first fuel supply valve 39 that is manually opened and closed. The first fuel supply valve 39 is provided with a fuel supply open / close detector (e.g., a reed switch) 56 that detects the open / close state. The second oil supply pipe 38 is connected to the lower part of the oil tank 3. The second oil supply pipe 38 is provided with a second oil supply valve 40 that can be opened and closed manually.

[0014] An oil tank 45 using a 18L can is provided below the oil tank 3. The oil tank 45 is placed on a stand 46 provided on the vessel body 2. The stand 46 is provided with a heater 47 for heating the oil tank 45 and a tank temperature sensor 48 for detecting the temperature of the oil tank 45. The lower end of an oil addition pipe 49 is inserted into the oil addition tank 45. The upper end of the oil addition pipe 49 is connected to the oil tank 3 above the second cooking section 8. An oil addition pump 50 and an oil addition solenoid valve 51 are provided in the oil addition pipe 49 from the upstream side.

[0015] A fry controller 60 is provided on the upper front surface of the appliance body 2. The fry controller 60 has an operation panel 61. As shown in Fig. 3, the operation panel 61 is provided with a power switch 62, a plurality of cooking buttons 63, 63..., displays 64, 64 for the selected cooking mode and a maintenance menu, etc., as well as a mode selection button 65 for selecting the cooking mode, and rated amount indicator lamps 66A, 66B for displaying the rated amount. The rated amount indicator lamp 66A corresponds to the first rated amount, and the rated amount indicator lamp 66B corresponds to the second rated amount. A burner controller 70 is provided at the bottom of the device body 2. The burner controller 70 controls the ON / OFF of the pulse burner 4 according to the cooking mode instructed by the fry controller 60, and cooks food such as potatoes. Detection signals from the first and second oil surface temperature sensors 11 and 12, the cooking temperature sensor 13, the oil refill temperature sensor 17, the tank temperature sensor 48, the oil refill opening / closing detection unit 55, the oil supply opening / closing detection unit 56, etc. are input to the burner controller 70. Based on these detection signals and instructions from the operation panel 61, the burner controller 70 controls the pulse burner 4, the gas solenoid valve 22, the fan 24, the electric heater 33, the filtering pump 35, the heat retention heater 47, the oil refill pump 50, the oil refill solenoid valve 51, etc.

[0016] In the fryer 1 configured as above, the amount of food to be cooked at one time is set to two types, a first rated amount and a second rated amount that is larger than the first rated amount, and cooking is possible in a first cooking mode corresponding to the first rated amount and a second cooking mode corresponding to the second rated amount. Cooking oil is stored in the oil booster tank 14 in a full state (the amount of oil boosted from the first rated oil amount to the second rated oil amount described below). (1st cooking mode) First, when cooking the first rated amount of food, cooking oil (first rated amount of oil) is stored in the oil tank 3 up to the top of the first cooking section 7, as shown by the diagonal lines in FIG. 4(A). In this state, when the cook turns on the power switch 62 of the operation panel 61, the burner controller 70, which has confirmed the cooking oil up to the top of the first cooking section 7 by the first oil surface temperature sensor 11, rotates the fan 24 for a predetermined time to supply air, and then intermittently burns the mixed gas in the combustion chamber 5 to turn the pulse burner 4 on and off. That is, the mixed gas is ignited in the combustion chamber 5 to cause it to explode and burn in the combustion chamber 5, and the combustion exhaust is forcibly discharged to the tail pipe 6 due to the pressure increase in the combustion chamber 5 caused by the combustion. Then, fuel gas and combustion air are sucked into the combustion chamber 5, which is under negative pressure due to the discharge of the combustion exhaust. This ON / OFF operation is repeated to heat the cooking oil stored in the oil tank 3. Burner controller 70 monitors the detected temperature obtained from cooking temperature sensor 13. When it is confirmed that the temperature of the cooking oil has reached a predetermined cooking temperature (e.g., 160°C), fry controller 60 notifies the user by, for example, outputting a display indicating that cooking is OK on display 64 of operation panel 61.

[0017] Next, the cook selects the first cooking mode with the mode selection button 65. Then, the fry controller 60 causes the display unit 64 to display that it is the first cooking mode, and turns on the rated amount display lamp 66A to notify that the first rated amount is being used. When this notification is given, the cook puts the basket containing the first rated amount of food into the oil vat 3. At this time, the first cooking mode is displayed on the display unit 64 of the operation panel 61, and the rated amount display lamp 66A is lit, so that the cook is less likely to put in the wrong amount of food. When the cook presses the cooking start button (here, the cooking button 63 on the left side), the burner controller 70 heats and cooks the food to be cooked for a first cooking time and a first heat amount of the pulse burner 4 that are preset in accordance with the first rated amount. When the first cooking time is up, the fry controller 60 sounds an alarm to notify the end of cooking. The cook then lifts the basket 9 out of the oil vat 3. If the cook wishes to continue cooking at the first rated amount, the cook can simply add the food to be cooked and press the cooking start button, and the same control process will be repeated.

[0018] (Switching from 1st cooking mode to 2nd cooking mode) When switching from the first cooking mode to the second cooking mode, it is necessary to increase the amount of cooking oil from the oil increase tank 14. Therefore, when the cook manually opens the oil refill valve 16, the cooking oil in the oil refill tank 14 is supplied to the upper end of the second cooking section 8 of the oil vat 3 through the oil refill pipe 15, as shown by the diagonal lines in Fig. 4(B), and the oil refill tank 14 becomes empty. The opening operation of the oil refill valve 16 is detected by the burner controller 70 through the oil refill opening / closing detection unit 55. When the oil refill valve 16 is closed and this closing operation is detected by the burner controller 70 via the oil refill opening / closing detector 55, the fry controller 60 displays on the display 64 that the cooking mode is the second cooking mode, turns off the rated amount indicator lamp 66A, and turns on the rated amount indicator lamp 66B, thereby announcing that the cooking mode has been switched to the second rated amount. This mode switching notification may be made immediately upon detecting the opening / closing of the oil refill valve 16, or may be made after a predetermined oil refill completion time (e.g., one minute) is counted from opening to closing and the valve is confirmed to be closed after the time has elapsed. An oil refill completion time that is counted for a while after the valve is closed may also be set.

[0019] On the other hand, when the oil-addition opening / closing detection unit 55 detects the opening operation of the oil-addition valve 16, the burner controller 70 switches the sensor that detects the oil level position to the second oil level temperature sensor 12. Therefore, when second oil surface temperature sensor 12 confirms that the cooking oil supplied to oil vat 3 has reached the upper end (second rated oil amount) of second cooking section 8, it monitors the detected temperature obtained from cooking temperature sensor 13. Then, when it confirms that the temperature of the cooking oil has reached a predetermined cooking temperature, fry controller 60 notifies the user by, for example, outputting a message indicating that cooking is OK on display 64 of operation panel 61.

[0020] When this notification is given, the cook places the basket 9 containing the second rated amount of food into the oil vat 3. At this time, the second cooking mode is displayed on the display unit 64 of the operation panel 61, and the rated amount display lamp 66B is lit, so that the cook is less likely to place the wrong amount of food. When the cook presses the cooking start button, the burner controller 70 heats and cooks the food for a second cooking time preset in accordance with the second rated amount and with a second amount of heat greater than the first amount of heat in the first cooking mode. This second amount of heat is obtained by operating the electric heater 33 in addition to the pulse combustor 4. However, the second amount of heat may be obtained by increasing the gas input only with the pulse combustor 4 without using the electric heater 33. When the second cooking time is up, the fry controller 60 sounds an alarm to notify the completion of cooking. The cook lifts the basket 9 out of the oil tank 3. If cooking with the second rated amount is to be continued, the cook adds food and presses the cooking start button, and the same control is repeated.

[0021] (Switching from 2nd cooking mode to 1st cooking mode) When switching from the second cooking mode to the first cooking mode, which uses a smaller amount of oil, the cook opens the oil drain valve 32 from the second rated oil amount state shown in Figure 4(B) and drains all of the cooking oil in the oil vat 3 into the filtering tank 30, as shown by the diagonal lines in Figure 5(A). Next, the first fuel supply valve 39 of the first fuel supply pipe 37 is opened, the second fuel supply valve 40 of the second fuel supply pipe 38 is closed, and the fuel boost valve 16 of the fuel booster pipe 15 is closed. Then, the burner controller 70 detects the opening of the first fuel supply valve 39 by the fuel supply open / close detection unit 56 and drives the filtering pump 35. Thus, the cooking oil in the filtering tank 30 is filtered and then supplied to the fuel booster tank 14 via the first fuel supply pipe 37 and the fuel booster pipe 15. When the fuel booster tank 14 becomes full, the cooking oil is supplied to the oil tank 3 via the overflow unit 18 as shown in FIG. 5(B). Then, when filtering is performed until the filtering tank 30 is empty, as shown in Fig. 4(A), the cooking oil of the second rated oil volume supplied to the oil reserve tank 14 is supplied to the oil vat 3 via the overflow part 18, leaving only the oil reserve from the first rated oil volume. In other words, the cooking oil of the first rated oil volume used in the first cooking mode is stored in the oil vat 3.

[0022] Then, when filtering is completed and the cook closes the first oil supply valve 39, and this closure is detected by the burner controller 70 via the oil supply opening / closing detection unit 56, the driving of the filtering pump 35 is stopped. Then, the fry controller 60, which has received information from the burner controller 70 that the first fuel supply valve 39 has been closed by the fuel supply opening / closing detection unit 56, displays on the display unit 64 that the mode is the first cooking mode, turns off the rated amount display lamp 66B, and turns on the rated amount display lamp 66A. This mode switching notification may also be made immediately upon detecting the opening / closing of the first fuel supply valve 39, or may be made after a predetermined fuel supply completion time (e.g., one minute) is counted from the time the valve is opened to the time it is closed, and the notification is made after it is confirmed that the valve has been closed after the time has elapsed. A fuel supply completion time that is counted for a while after the valve is closed may also be set. In addition, when the burner controller 70 detects the opening operation of the first fuel supply valve 39 by the fuel supply opening / closing detection unit 56, it switches the sensor that detects the oil level position to the first oil level temperature sensor 11 and executes the above-mentioned first cooking mode.

[0023] On the other hand, during operation in the first and second cooking modes, the burner controller 70 monitors the detected temperature obtained from the tank temperature sensor 48 and controls the heat retention heater 47 to be turned ON / OFF so that a predetermined heat retention temperature is maintained in the top-up oil tank 45. When the first and second oil surface temperature sensors 11, 12 detect a decrease in the amount of cooking oil required in either the first or second cooking mode, or when a predetermined number of cooking cycles is reached, the oil top-up pump 50 is driven to open the oil top-up solenoid valve 51. Then, the cooking oil liquefied in the oil top-up tank 45 is directly supplied to the oil vat 3 via the oil top-up pipe 49.

[0024] Thus, the fryer 1 of the above embodiment includes an oil tank 3 capable of storing cooking oil, an oil increasing means consisting of an oil increasing tank 14, an oil increasing pipe 15, and an oil increasing valve 16 capable of increasing cooking oil to the oil tank 3, an oil reducing means consisting of a filtering tank 30, a first oil supply pipe 37, a filtering pump 35, a first oil supply valve 39, and an overflow section 18 capable of reducing cooking oil from the oil tank 3, a pulse combustor 4 (heating means) provided in the oil tank 3 for heating the cooking oil, and a burner controller 70 (control means) for controlling the pulse combustor 4. The burner controller 70 is capable of executing a first cooking mode in which the pulse combustor 4 is controlled with a predetermined first rated oil amount not increased by the oil increasing means to heat and cook food, and a second cooking mode in which the pulse combustor 4 is controlled with the oil increased by the oil increasing means to heat and cook food. The fryer 1 also includes a first oil surface temperature sensor 11 positioned in the oil tank 3 below the oil level position at the first rated oil amount to detect the temperature of the cooking oil, a second oil surface temperature sensor 12 positioned in the oil tank 3 above the oil level position to detect the temperature of the cooking oil, and an oil increase / decrease opening / closing detection unit 55 and an oil supply opening / closing detection unit 56 (oil increase / decrease detection means) that detect the oil increase operation by the oil increase means and the oil reduction operation by the oil reduction means. When the oil-boosting opening / closing detection unit 55 does not detect the oil-boosting operation of the oil-boosting means, the burner controller 70 detects the position of the oil level based on the temperature detected by the first oil level temperature sensor 11, and when the oil-boosting opening / closing detection unit 55 detects the oil-boosting operation of the oil-boosting means, the burner controller 70 detects the position of the oil level based on the temperature detected by the second oil level temperature sensor 12.

[0025] According to this configuration, the oil surface temperature sensor that detects the position of the oil surface automatically switches to the second oil surface temperature sensor 12 in conjunction with the cooking oil refilling operation, so that the appropriate oil surface position can be detected when the oil has been refilled. Therefore, it is possible to reliably detect whether an appropriate amount of cooking oil is stored in the oil vat 3 for cooking in the second cooking mode. In addition, since the cook does not need to switch the oil surface temperature sensor, no extra burden is placed on the cook.

[0026] In particular, when the burner controller 70 is detecting the oil level position based on the temperature detected by the second oil surface temperature sensor 12 and the oil reduction operation of the oil reduction means is detected by the oil supply opening / closing detection unit 56, the burner controller 70 switches to detecting the oil level position based on the temperature detected by the first oil surface temperature sensor 11. Therefore, it is possible to detect the appropriate oil level position when the cooking oil has been reduced, and it is possible to reliably detect whether an appropriate amount of cooking oil is stored in the oil vat 3 for heating and cooking in the first cooking mode, making it possible to prevent empty-burning, etc.

[0027] The oil boosting means includes an oil booster tank 14 capable of storing a predetermined amount of cooking oil, an oil booster pipe 15 connected from the oil booster tank 14 to the oil tank 3, and an oil booster valve 16 (oil booster opening / closing means) that can manually open and close the oil booster pipe 15, and the oil booster opening / closing detection unit 55 detects whether or not an oil boosting operation is occurring based on the open / closed state of the oil booster valve 16. Therefore, the burner controller 70 can reliably detect the manual oil increase operation and switch the oil surface temperature sensor. The oil reduction means includes a filtering tank 30 that filters the cooking oil in the oil tank 3, a first oil supply pipe 37 that connects the filtering tank 30 and the oil reserve tank 14, a filtering pump 35 (pump) provided on the first oil supply pipe 37, a first oil supply valve 39 (oil supply opening / closing means) that can manually open and close the first oil supply pipe 37, and an overflow section 18 (overflow path) that guides cooking oil that has overflowed from the oil reserve tank 14 to the oil tank 3, and the oil supply opening / closing detection section 56 detects whether or not an oil reduction operation is performed based on the open / closed state of the first oil supply valve 39. Therefore, the burner controller 70 can reliably detect the manual oil reduction operation and switch the oil surface temperature sensor.

[0028] The following describes a modified example. In the above embodiment, the oil replenishing means is configured to manually open the oil replenishing valve, but the oil replenishing valve may be an electromagnetic valve and the oil replenishing valve may be automatically opened by operating the operation panel to perform the oil replenishing operation. In this case, the oil replenishing / decreasing detection means may be configured to detect an operation signal from the operation panel. The oil reduction means is configured to manually open the first oil supply valve to return the filtered cooking oil to the oil tank via the oil supply tank, but is not limited to this. For example, the oil drain valve and the first oil supply valve may be electromagnetic valves, and both valves may be automatically opened by operating the operation panel to filter the cooking oil. The oil increase / decrease detection means in this case may also be configured to detect the detection signal from the operation panel. The oil reducing means may be configured to reduce the cooking oil in the oil vat by manually opening only the oil drain valve or automatically opening the oil drain valve. In this case, the oil increase / decrease detection means may be configured to detect the opening operation of the oil drain valve. Furthermore, in the above embodiment, the oil surface temperature sensor is switched at the timing when the oil increase or oil reduction operation is started, but similar to the mode switching notification, the oil surface temperature sensor may be switched after waiting for a predetermined oil increase completion time or oil supply completion time to elapse.

[0029] The fryer is not limited to one having a fry controller and a burner controller separately provided, but may be one having a single controller having the functions of both the fry controller and the burner controller. The heating means may be formed only of a pulse combustor or only of an electric heater. The heating means may be formed only of a gas burner provided outside the oil vat. Furthermore, the heating means may be formed of a combination other than the combination of a pulse combustor and an electric heater. In the above embodiment, a pair of oil tanks are provided on the left and right sides, but the number of oil tanks may be one, or conversely, three or more. The present disclosure is also applicable to a pressure fryer in which the opening of the oil tank is closed with a lid. [Explanation of symbols]

[0030] Reference Signs List 1·· Fryer, 2·· Vessel body, 3·· Oil tank, 4·· Pulse burner, 5·· Combustion chamber, 6·· Tail pipe, 7·· First cooking section, 8·· Second cooking section, 9·· Basket, 11·· First oil level temperature sensor, 12·· Second oil level temperature sensor, 13·· Cooking temperature sensor, 14·· Oil booster tank, 15·· Oil booster pipe, 16·· Oil booster valve, 18·· Overflow section, 22·· Gas solenoid valve, 30·· Filtering tank , 35··Filtering pump, 37··First fuel supply pipe, 38··Second fuel supply pipe, 39··First fuel supply valve, 40··Second fuel supply valve, 55··Fuel supply opening / closing detection unit, 56··Fuel supply opening / closing detection unit, 60··Frying controller, 61··Operation panel, 62··Power switch, 63··Cooking button, 64··Display unit, 65··Mode selection button, 66A, 66B··Rated amount display lamp, 70··Burner controller.

Claims

1. An oil tank capable of storing cooking oil; An oil supply means capable of supplying cooking oil to the oil tank; An oil reducing means capable of reducing cooking oil from the oil tank; A heating means provided in the oil tank for heating cooking oil; A control means for controlling the heating means, The control means is capable of executing a first cooking mode in which the heating means is controlled with a predetermined rated amount of oil not increased by the oil increasing means to heat-cook the food to be cooked, and a second cooking mode in which the heating means is controlled with the oil increased by the oil increasing means to heat-cook the food to be cooked, a first oil surface temperature sensor disposed in the oil vat below an oil surface position at the rated oil amount to detect a temperature of the cooking oil; a second oil surface temperature sensor disposed in the oil vat above the oil surface position to detect the temperature of the cooking oil; An oil increase / decrease detection means for detecting an oil increase operation by the oil increase means and an oil reduction operation by the oil reduction means, The control means detects the position of the oil level based on the temperature detected by the first oil surface temperature sensor when the oil increase / decrease oil detection means does not detect the oil increase operation of the oil increase means, and detects the position of the oil level based on the temperature detected by the second oil surface temperature sensor when the oil increase / decrease oil detection means detects the oil increase operation of the oil increase means.

2. The fryer described in claim 1, characterized in that when the control means detects the oil level position based on the detected temperature of the second oil surface temperature sensor and the oil increase / decrease oil detection means detects the oil reduction operation of the oil reduction means, the control means switches to detecting the oil level position based on the detected temperature of the first oil surface temperature sensor.

3. The oil replenishing means includes an oil replenishing tank capable of storing a predetermined amount of cooking oil, an oil replenishing pipe connected from the oil replenishing tank to the oil tank, and an oil replenishing opening / closing means capable of manually opening and closing the oil replenishing pipe; 3. The fryer according to claim 1, wherein the oil increase / decrease detection means detects whether or not an oil increase operation is performed based on the open / closed state of the oil increase opening / closing means.

4. The oil reducing means includes a filtering tank for filtering the cooking oil in the oil tank, an oil supply pipe connecting the filtering tank and the oil booster tank, a pump provided in the oil supply pipe, an oil supply opening / closing means for manually opening and closing the oil supply pipe, and an overflow path for guiding cooking oil overflowing from the oil booster tank to the oil tank, 4. The fryer according to claim 3, wherein the oil increase / decrease detection means detects whether or not an oil reduction operation is performed based on the open / close state of the oil supply opening / closing means.

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