JP2017015371A - Gas flyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent increase in concentration of carbon monoxide included in combustion gas immediately after combustion start of gas combustion means.SOLUTION: A proportional valve is equipped, which is arranged in a gas supply pipe, and adjusts the secondary pressure of gas to be supplied into a gas burner. Since the combustion start of the gas burner until a draft effect is generated in an exhaust duct, the gas combustion of the gas burner is executed in an initial combustion mode in which the gas secondary pressure is made to be lower pressure than the gas secondary pressure during normal combustion. After the draft effect is generated in the exhaust duct, the gas combustion of the gas burner is executed, in a normal combustion more in which the gas secondary pressure is made to be pressure suitable for normal combustion.SELECTED DRAWING: Figure 6

Description

  According to the present invention, the gas supplied through the gas supply pipe is burned by the gas combustion means (gas burner), the oil tank in which the cooking oil is stored is heated with the generated combustion gas, and the oil tank after the heat exchange is performed. The present invention relates to a gas fryer that raises combustion gas in an exhaust duct and discharges it outside.

  Commercial gas fryer used in restaurants and convenience stores has been put into practical use. The gas fryer includes an oil tank provided in the gas fryer body and containing a predetermined amount of cooking oil, and heating means for heating the cooking oil stored in the oil tank to a predetermined temperature. Examples of the heating means include a gas burner that is disposed outside the oil tank and heats the oil tank by gas combustion, and an electric heater that is immersed in cooking oil in the oil tank to heat the cooking oil. The present invention relates to a gas fryer using a gas burner as a heating means. Here, the gas fryer which employ | adopted the gas burner is disclosed by patent document 1. FIG.

  FIG. 2 is a longitudinal side view showing a schematic configuration of a main part of the gas fryer 10 shown in FIG. The gas fryer 10 includes a box-shaped main body 11, an oil tank 12 that opens upward and is disposed in the main body 11, and a gas burner 13 that is installed in the main body 11 below the front side of the oil tank 12. Yes. An inner box 21 is disposed on the outer surface of the oil tank 12 to form a combustion gas passage 14 through which combustion gas generated by the combustion of gas in the gas burner 13 moves, and at the rear of the main body 11 (the oil tank 12 On the rear side, an exhaust duct 15 communicating with the combustion gas passage 14 is erected in an upright posture. As a result, the high-temperature combustion gas generated by the combustion of the gas in the gas burner 13 heats the oil tank 12 by exchanging heat with the oil tank 12 when moving through the combustion gas passage 14, and the combustion The combustion gas that has moved through the gas passage 14 moves upward in the exhaust duct 15 and is discharged to the outside. Then, the combustion gas rises and moves in the exhaust duct 15 to generate a so-called draft effect (chimney effect), so that combustion air in the gas burner 13 flows from the intake port 16 formed in the bottom of the main body 11 into the main body 11. It is supposed to be taken in. Here, the draft effect means that when there is air in the chimney that is hotter than the outside air, the hot air has a lower density than the cold air, so buoyancy occurs in the air in the chimney, and the air from the air intake at the bottom of the chimney The effect of warm air rising while drawing outside cold air into the chimney. When this draft effect occurs, the combustion efficiency in the gas burner 13 can be increased.

  The gas fryer 10 shown in FIG. 1 and FIG. 2 includes two electromagnetic valves 26 and 27 in the middle of a gas supply pipe 25 connected to the gas burner 13. By controlling the opening and closing, the gas is supplied to and shut off from the gas burner 13 through the gas supply pipe 25.

Japanese Patent Application Laid-Open No. 2011-58680

  By the way, the gas fryer 10 uses the combustion gas until the combustion gas moves to the exhaust duct 15 at the start of operation, that is, immediately after the combustion of the gas burner 13 is started when the oil tank 12 is at room temperature (room temperature). The draft effect does not occur. For this reason, the combustion gas is not sufficiently discharged until the draft effect occurs, and external air is not sufficiently taken into the main body 11 through the intake port 16. Therefore, in the gas burner 13, incomplete combustion due to oxygen shortage is likely to occur, and the concentration of carbon monoxide contained in the combustion gas in the combustion gas passage 14 becomes high. When the combustion gas that has moved from the combustion gas passage 14 to the exhaust duct 15 moves upward in the exhaust duct 15, the combustion gas having a high carbon monoxide concentration is externally supplied from the upper exhaust port of the exhaust duct 15. There is an inconvenience of being discharged as it is.

  Here, as a method of preventing incomplete combustion of the gas burner 13 and avoiding an increase in the concentration of carbon monoxide, (1) adjusting the gas supply amount, (2) protruding into the combustion gas passage 14 The number of fins disposed on the outer surface of the oil tank 12 is reduced, the passage resistance of the combustion gas passing through the combustion gas passage 14 is reduced, and the combustion gas is easily moved to the exhaust duct 15. Can be considered. However, in the case of (1), it is possible to suppress the generation of carbon monoxide, but since the amount of heat generated by the combustion of the gas burner 13 decreases, it takes time to heat the oil tank 12 and the temperature of the cooking oil rises. Since it becomes late | slow, there exists a problem which takes time until the gas fryer 10 will be in the state which can cook a foodstuff. In the case of (2), although the combustion gas easily moves to the exhaust duct 15, the heat exchange rate between the combustion gas and the oil tank 12 decreases, so that it takes time to heat the oil tank 12 and cooking oil. The problem that it takes a long time for the gas fryer 10 to become ready for cooking the food is not solved.

  In view of the above-mentioned problems inherent in the conventional gas fryer, the present invention has been proposed to suitably solve these problems, and carbon monoxide contained in the generated combustion gas immediately after the start of combustion of the gas combustion means. An object of the present invention is to provide a gas fryer that can prevent the concentration of the gas from becoming high.

In order to solve the above-mentioned problems and achieve the intended object, the invention according to claim 1 is to heat an oil tank in which cooking oil is stored by burning gas supplied from a gas supply pipe by a gas combustion means. In the gas fryer for raising the combustion gas after exchanging heat with the oil tank and exhausting it to the outside in the exhaust duct,
A secondary pressure adjusting means arranged in the gas supply pipe for adjusting a secondary pressure of the gas supplied to the gas combustion means;
A normal combustion mode for adjusting the gas secondary pressure to a pressure suitable for normal combustion by the secondary pressure adjusting means and executing gas combustion of the gas combustion means when a draft effect is generated by the exhaust duct; When the draft effect by the exhaust duct does not occur, the gas secondary pressure is adjusted by the secondary pressure adjusting means to a pressure lower than the gas secondary pressure at the time of normal combustion, and the gas combustion of the gas combustion means Set the initial combustion mode to execute
From the start of combustion of the gas combustion means until the draft effect is produced in the exhaust duct, gas combustion of the gas combustion means is executed in the initial combustion mode,
After the draft effect is generated in the exhaust duct, the gist is to switch to the normal combustion mode and execute gas combustion of the gas combustion means.
According to the first aspect of the present invention, in the initial combustion mode in which the gas secondary pressure of the gas before the gas combustion means is lower than that in the normal combustion from immediately after the start of combustion of the gas combustion means until the draft effect occurs. The combustion of the gas combustion means is performed. Therefore, in the state where the draft effect immediately after the start of combustion of the gas combustion means is not sufficiently generated, the gas secondary pressure is lowered and the combustion of the gas combustion means is executed, so that incomplete combustion hardly occurs and the combustion gas It is possible to suppress an increase in the concentration of carbon monoxide contained in. In addition, after the draft effect has occurred in the exhaust duct, the combustion of the gas combustion means is performed in a state where the gas secondary pressure is higher than that in the initial combustion mode. It can be minimized, and can prevent the food cooking operation from being hindered.

In the invention according to claim 2, the time measuring means for measuring the combustion mode switching time from the start of combustion of the gas combustion means until the draft effect occurs in the exhaust duct;
Control means for receiving the time signal from the time measuring means and controlling the secondary pressure adjusting means to adjust the gas secondary pressure;
Until the timing means times the combustion mode switching time, the control means executes gas combustion of the gas combustion means in the initial combustion mode,
The gist of the invention is that the control means performs gas combustion of the gas combustion means in the normal combustion mode after the time measuring means has timed the combustion mode switching time.
According to the second aspect of the present invention, the combustion mode switching time is preset as the time required from the start of combustion of the gas combustion means until the draft effect occurs. Thereby, the concentration of carbon monoxide contained in the combustion gas before the draft effect occurs by executing the combustion of the gas combustion means in the initial combustion mode until the combustion mode switching time elapses from the start of combustion of the gas combustion means. Can be appropriately and reliably suppressed.

In the invention according to claim 3, the time measuring means for measuring the combustion mode switching time from the start of combustion of the gas combustion means until the draft effect is produced in the exhaust duct;
Oil temperature detecting means for detecting the oil temperature of the cooking oil stored in the oil tank;
Control means for receiving the oil temperature data from the oil temperature detecting means and controlling the secondary pressure adjusting means to adjust the gas secondary pressure;
Based on the oil temperature data measured by the oil temperature detecting means, the control means sets the combustion mode switching time,
Until the timing means times the combustion mode switching time, the control means executes gas combustion of the gas combustion means in the initial combustion mode,
The gist of the invention is that the control means performs gas combustion of the gas combustion means in the normal combustion mode after the time measuring means has timed the combustion mode switching time.
According to the invention of claim 3, the combustion mode switching time, which is the time required from the start of combustion of the gas combustion means until the draft effect occurs, is set based on the oil temperature of the cooking oil stored in the oil tank. Thus, the combustion of the gas combustion means is performed in the initial combustion mode from the start of combustion of the gas combustion means until the combustion mode switching time set based on the oil temperature elapses, before the draft effect occurs. It can suppress appropriately and reliably that the density | concentration of the carbon monoxide contained in gas increases.

In invention of Claim 4, the gas temperature detection means which can detect the temperature of the combustion gas which passes the said exhaust duct,
Control means for receiving the gas temperature data from the gas temperature detecting means and controlling the secondary pressure adjusting means to adjust the gas secondary pressure;
Based on the gas temperature of the combustion gas measured by the gas temperature detection means, the control means sets a combustion mode switching temperature for determining switching of the combustion mode,
Until the gas temperature of the combustion gas reaches the combustion mode switching temperature, the control means executes gas combustion of the gas combustion means in the initial combustion mode,
After the gas temperature of the combustion gas becomes equal to or higher than the combustion mode switching temperature, the control means executes the combustion of the gas combustion means in the normal combustion mode.
According to the fourth aspect of the present invention, the gas temperature of the combustion gas passing through the exhaust duct is detected, and the combustion mode switching temperature serving as a criterion for determining the combustion mode switching is compared with the gas temperature to switch the combustion mode. Since the determination is performed, it is possible to appropriately and reliably suppress an increase in the concentration of carbon monoxide contained in the combustion gas before the draft effect occurs.

In invention of Claim 5, the humidity detection means which can detect the humidity of the air supplied to the gas combustion means is provided,
The gist is that the control means corrects the combustion mode switching time based on humidity data measured by the humidity detection means.
According to the fifth aspect of the present invention, the combustion mode switching time, which is the time required from the start of combustion of the gas combustion means to the generation of the draft effect, is set based on the humidity of the air used for combustion in the gas combustion means. Is done. Thus, by performing combustion of the gas combustion means in the initial combustion mode from the start of combustion of the gas combustion means until the combustion mode switching time set based on the humidity of air elapses, before the draft effect occurs, An increase in the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed.

In invention of Claim 6, the humidity detection means which can detect the humidity of the air supplied to the gas combustion means is provided,
The gist is that the control means corrects the combustion mode switching temperature based on air humidity data measured by the humidity detection means.
According to the invention which concerns on Claim 6, based on the humidity of the air utilized for the combustion by a gas combustion means, the combustion mode switching temperature used as the combustion mode switching determination reference | standard is set. Then, the gas temperature of the combustion gas passing through the exhaust duct is detected, and the combustion mode switching determination is made by comparing the gas temperature with the combustion mode switching temperature set based on the humidity of the air. It is possible to appropriately and reliably suppress an increase in the concentration of carbon monoxide contained in the combustion gas before this occurs.

The invention according to claim 7 includes air temperature detection means capable of detecting the temperature of air supplied to the gas combustion means,
The gist is that the control means corrects the combustion mode switching time based on the air temperature data measured by the air temperature detection means.
According to the seventh aspect of the present invention, the combustion mode switching time, which is the time required from the start of combustion of the gas combustion means to the generation of the draft effect, is set based on the temperature of the air used for combustion in the gas combustion means. Is done. By this, by performing combustion of the gas combustion means in the initial combustion mode from the start of combustion of the gas combustion means until the combustion mode switching time set based on the temperature of air elapses, before the draft effect occurs, An increase in the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed.

The invention according to claim 8 further comprises air temperature detection means capable of detecting the temperature of the air supplied to the gas combustion means,
The gist is that the control means corrects the combustion mode switching temperature based on the air temperature data measured by the air temperature detection means.
According to the eighth aspect of the present invention, the combustion mode switching temperature that serves as the determination criterion for switching the combustion mode is set based on the temperature (room temperature) of air used for combustion in the gas combustion means. Then, the gas temperature of the combustion gas passing through the exhaust duct is detected, and the combustion mode switching determination is performed by comparing the gas temperature with the combustion mode switching temperature set based on the air temperature (room temperature). Before the draft effect occurs, the increase in the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed.

The invention according to claim 9 comprises a gas primary pressure detecting means capable of detecting a primary pressure of the gas supplied from the gas supply source through the gas supply pipe,
The gist is that the control means corrects the combustion mode switching time based on the gas primary pressure data measured by the gas primary pressure detection means.
According to the ninth aspect of the present invention, the combustion mode switching time that is the time required from the start of combustion of the gas combustion means until the draft effect occurs is set based on the gas primary pressure of the gas supplied to the gas combustion means. Is done. Thus, before the draft effect occurs by performing combustion of the gas combustion means in the initial combustion mode from the start of combustion of the gas combustion means until the combustion mode switching time set based on the primary gas pressure elapses. It is possible to appropriately and reliably suppress the increase in the concentration of carbon monoxide contained in the combustion gas.

In invention of Claim 10, the gas primary pressure detection means which can detect the primary pressure of the gas supplied to the gas supply pipe is provided,
The gist is that the control means corrects the combustion mode switching temperature based on the gas primary pressure data measured by the gas primary pressure detection means.
According to the invention which concerns on Claim 10, based on the gas primary pressure of the gas supplied to a gas combustion means, the combustion mode switching temperature used as the combustion mode switching determination reference | standard is set. Since the temperature of the combustion gas passing through the exhaust duct is detected and the combustion mode switching temperature set based on the primary gas pressure is compared with the gas temperature, the combustion mode switching determination is performed. Before the effect is produced, the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed.

The invention according to claim 11 is characterized in that the gas secondary pressure based on the secondary pressure adjusting means and the combustion mode switching time or the combustion mode switching temperature can be changed and set at any time by the control means. And
According to the invention of claim 11, the gas secondary pressure, the combustion mode switching time or the combustion mode switching temperature can be set as needed by the control means for controlling the gas combustion means and the secondary pressure adjusting means, There is no need to separately install a setting means for setting the gas secondary pressure, the combustion mode switching time or the combustion mode switching temperature, so that parts management becomes easy and the manufacturing cost can be reduced.

In the invention of claim 12, based on the type of gas used for combustion of the gas combustion means and the type of the gas combustion means, the set value of the gas secondary pressure by the secondary pressure adjusting means, A plurality of setting groups preset with a combustion mode switching time or a setting value of the combustion mode switching temperature are stored in the control means,
The gist of the invention is that the gas secondary pressure and the combustion mode switching time or the combustion mode switching temperature can be set collectively by selecting the setting group by the control means.
According to the twelfth aspect of the present invention, the gas secondary pressure, the combustion mode switching time, or the combustion mode switching temperature is collectively set by selecting a setting group based on the type of gas and the type of gas combustion means. Thus, setting errors can be prevented and setting time can be shortened.

In the invention according to claim 13, the secondary pressure adjusting means is a proportional valve whose valve opening is adjusted based on a current value applied from the control means,
The gist of the present invention is that the current value of the current applied from the control means to the secondary pressure adjusting means can be adjusted by measuring the gas secondary pressure.
According to the thirteenth aspect of the present invention, even if there is an individual difference in the secondary pressure adjusting means that is a proportional valve, the current value of the current applied from the control means can be set appropriately.

In the invention described in claim 14, the set value of the gas secondary pressure and the set value of the combustion mode switching time (Tc) or the combustion mode switching temperature are currents caused by individual differences of the secondary pressure adjusting means. The gist is that it is set based on the average value of the dispersion of values.
According to the invention of claim 14, even if there is an individual difference in the secondary pressure adjusting means that is a proportional valve, the gas secondary pressure in each setting group and the combustion mode switching time or the combustion mode switching temperature are obtained. It is possible to set to an appropriate setting value.

In invention of Claim 15, the 1st on-off valve and the 2nd on-off valve which were arrange | positioned in series in the middle of the said gas supply pipe,
Control means for performing open / close control of the first open / close valve and the second open / close valve;
The control means includes
When stopping the supply of gas to the gas combustion means, the first on-off valve and the second on-off valve are closed with a predetermined time difference,
The gist is that the order of closing the first on-off valve and the second on-off valve is executed in reverse every time the gas supply to the gas combustion means is stopped.
According to the fifteenth aspect of the present invention, the closing order of the first on-off valve and the second on-off valve is reversed every time the gas supply to the gas combustion means is stopped. It is possible to confirm an operation failure related to the opening of the two on-off valves. Thereby, it is possible to prevent a gas leak from occurring after the combustion of the gas combustion means is stopped.

  The gas fryer according to the present invention can prevent the concentration of carbon monoxide contained in the combustion gas from increasing immediately after the start of combustion of the gas combustion means.

It is the perspective view which looked at the gas fryer which concerns on the Example of this invention from the front right diagonal upper direction. It is the X1-X1 sectional view taken on the line of FIG. FIG. 3 is a cross-sectional view taken along line X2-X2 of FIG. It is explanatory drawing which shows the state which has arrange | positioned collectively the various detection means required in order to perform a gas burner combustion control while showing schematic structure of a gas fryer. It is explanatory drawing which shows the operation panel arrange | positioned at the front surface of a main body. It is a timing chart concerning gas burner combustion control. It is a flowchart of the gas burner combustion control of an Example. It is a flowchart of the draft effect determination process which concerns on a 1st embodiment about the draft effect determination process in the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 2nd embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 3rd embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 4th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 5th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 6th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 7th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on an 8th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart of the draft effect determination process which concerns on a 9th embodiment about the draft effect determination process in the flowchart of the gas burner combustion control shown in FIG. It is a flowchart which shows the valve closing process in the flowchart of the gas burner combustion control shown in FIG. (a) is the figure which showed the gas secondary pressure in an initial stage combustion mode and a normal combustion mode for every kind of gas, (b) is the combustion mode switching time based on the oil temperature of cooking oil, It is the figure shown for every kind. It is a figure which shows the setting group in which the valve opening degree of the proportional valve, the combustion mode switching time, and the combustion mode switching temperature were set based on the kind of gas and the gas consumption of a gas burner. It is a figure which shows the temperature display mode of the cooking oil displayed on an oil temperature display panel, Comprising: (a) shows the display mode of setting temperature display mode, (b) shows the display mode of actual temperature display mode ing.

  Next, the gas fryer according to the present invention will be described below with reference to the accompanying drawings by way of preferred examples. In addition, the front side of the gas fryer 10 in an Example points out the side by which the front cover panel 17 was arrange | positioned, and the left-right direction is designated in the state which looked at the gas fryer 10 from the front side.

(Schematic configuration of the gas fryer 10)
As shown in FIGS. 1 to 3, the gas fryer 10 according to the embodiment includes a box-shaped main body 11, an oil tank 12 that stores cooking oil and disposed in the main body 11, and a lower front side of the oil tank 12. And a gas burner 13 as gas combustion means installed. The oil tank 12 is formed in a box shape opened upward so that food for frying cooking (not shown) can be taken in and out. Inner box 21 is disposed in oil tank 12, and combustion gas generated by combustion of gas in combustion chamber 20 and gas burner 13 moves between the outer surface of oil tank 12 and inner box 21. Possible combustion gas passages 14 are defined. Further, an exhaust duct 15 that spatially communicates with the combustion gas passage 14 is erected on the rear side of the oil tank 12 (rear part of the main body 11) in a standing posture. Such a gas fryer 10 is formed between the combustion gas and the oil tank 12 when the combustion gas generated by the combustion of the gas in the gas burner 13 moves through the combustion gas passage 14 from the combustion chamber 20 toward the exhaust duct 15. Then, the oil tank 12 is heated to a predetermined set temperature and the cooking oil stored in the heated oil tank 12 is heated to a predetermined cooking temperature. The combustion gas that has moved through the combustion gas passage 14 moves into the exhaust duct 15 and moves upward in the exhaust duct 15 and is discharged to the outside through an exhaust port 16 formed in the upper portion of the exhaust duct 15. It is configured as follows.

(About the operation panel 50)
As shown in FIG. 1, a front cover panel 17 is disposed at the front of the main body 11. On the front surface of the front cover panel 17, as shown in FIG. 5, an operation panel 50 is provided on which various setting buttons including an operation button 51 for turning on and off the power, a display panel, and the like are arranged. . As setting buttons, an oil temperature setting button 52 for setting the temperature (oil temperature) of cooking oil stored in the oil tank 12, a cooking time setting button 53 for setting cooking time, a start button 54 for a cooking time timer for measuring cooking time, A standby button 57 for interrupting cooking is provided. In addition, an oil temperature display panel 55 that displays the temperature of cooking oil and a cooking time display panel 56 that displays the elapsed cooking time (or the remaining cooking time) are provided as display panels. In the front cover panel 17, as shown in FIG. 2, a gas controller board 30 which is a control means for controlling the combustion of the gas burner 13, and an instruction signal to the gas controller board 30 that can communicate with the gas controller board 30. A display substrate 31 that is a second control means for transmitting the power, a breaker 32 that shuts off the power supply to the gas fryer 10, and the like are disposed.

(About oil tank 12)
As shown in FIGS. 1 and 2, the oil tank 12 is formed in a box shape that opens upward and protrudes downward. The oil tank 12 includes a first oil reservoir 12a positioned below, and a second oil reservoir 12b provided on the upper side of the first oil reservoir 12a and connected to the first oil reservoir 12a. The opening area of the 2nd oil storage part 12b is set larger than the 1 oil storage part 12a, and it is comprised so that a predetermined amount of cooking oil can be stored. In the oil tank 12, the cooking oil is filled in the first oil reservoir 12a and is filled to about ½ of the depth of the second oil reservoir 12b as the prescribed amount of the cooking oil (FIG. 2). Is indicated by a one-dot chain line). An oil temperature detection sensor (oil temperature detection means) detects a temperature (oil temperature) Tb of cooking oil stored in the oil tank 12 stored in the oil tank 12 on the rear plate portion of the first oil storage section 12a of the oil tank 12. ) A sensor mounting portion 18 for mounting 19 is provided. The sensor mounting portion 18 is provided at a position farthest from the combustion chamber 20 in the oil tank 12, and the oil temperature Tb detected by the oil temperature detection sensor 19 is the temperature of the portion of the cooking oil where the temperature is low.

(About the oil temperature detection sensor 19)
The oil temperature detection sensor 19 is a thermistor or the like provided with a temperature detection part formed in an elongated round bar shape, and is fixed to the sensor mounting part 18 in a state of extending into the oil tank 12 and stored in the oil tank 12. So that it can be immersed in cooking oil. The oil temperature detection sensor 19 is configured to detect the oil temperature Tb of the cooking oil while being immersed in the cooking oil, and to output the detected oil temperature data to the display substrate 31. The oil temperature detection sensor 19 is a mold type that is hardly affected by air.

(About inner box 21)
As shown in FIG. 2, the oil tank 12 is provided with an inner box 21 that covers the first oil reservoir 12a from the outside. The inner box 21 is disposed away from the outer peripheral surface of the first oil reservoir 12a, and between the outer peripheral surface of the oil tank 12, the combustion chamber 20 constituting the combustion gas discharge structure and the combustion described above. A gas passage 14 is defined. A burner installation port 22 for forming the gas burner 13 is formed at the bottom of the inner box 21 at a position facing the combustion chamber 20. A heat insulating member 23 is disposed inside the inner box 21 so that the heat of the high-temperature combustion gas generated by the gas burner 13 can be suppressed from moving to the outside of the inner box 21. Yes.

(About gas burner 13)
As the gas burner 13 as the gas combustion means, a so-called Bunsen burner having a structure for sucking unpressurized primary air by a gas flow is adopted. As shown in FIGS. 2 to 4, the gas burner 13 extends in the longitudinal direction of the case body 40 in the case body 40 that is open upward and is formed in a rectangular box shape that is elongated in the left-right direction. A gas distribution pipe (not shown) connected to the gas supply pipe 25 is provided, and a plurality of burner sections (combustion sections) 42 (see FIG. 4) are provided in a row on the upper surface of the gas distribution pipe. It has been. And the continuous combustion is possible because the gas supplied from the gas distribution pipe and the primary air taken into the case body 40 are mixed. In addition, the gas burner 13 arrange | positioned at the burner installation port 22 is arrange | positioned at appropriate intervals from the 1st oil storage part 12a of the oil tank 12 to the front side, and the gas flame which generate | occur | produces from the burner part 42 is the 1st oil storage part 12a. It is designed to prevent incomplete combustion from occurring by hitting the front outer surface.

(Spark plug 43 and frame rod 44)
As shown in FIG. 4, the gas burner 13 is provided with a spark plug 43 and a frame rod 44. The spark plug 43 is electrically connected to the gas controller board 30 and electrically generates a spark by an igniter controlled by the gas controller board 30 and is supplied from the gas supply pipe 25 and mixed with the primary air. The combustion of the gas is started. Further, the flame rod (flame detector) 44 is electrically connected to the gas controller board 30 and has a characteristic that current does not flow while the burner portion 42 of the gas burner 13 flows during combustion and does not flow during non-combustion. Thus, the combustion in the burner portion 42 can be monitored.

(About gas supply pipe 25)
2 to 4, a gas supply pipe 25 connected to an external gas supply source (not shown) is connected to the gas burner 13, and a combustion gas is connected through the gas supply pipe 25. (City gas, propane gas, etc.) are supplied to the gas distribution pipe. A valve unit 45 is disposed in the middle of the gas supply pipe 25, and the gas supply pipe 25 is connected to a gas intake 46 connected to a gas supply source (not shown) and an inflow side of the valve unit 45. It comprises a primary gas supply pipe 25a and a secondary gas supply pipe 25b connected to the outflow side of the valve unit 45 and the gas distribution pipe of the gas burner 13.

(Valve unit 45)
The valve unit 45 includes the first electromagnetic valve 26 connected to the outlet side of the primary gas supply pipe 25 a and the second electromagnetic valve 27 connected to the outlet side of the first electromagnetic valve 26. . The first electromagnetic valve 26 and the second electromagnetic valve 27 are controlled to be opened and closed by the gas controller board 30. The valve unit 45 of the embodiment includes a proportional valve 35 that is controlled to be opened and closed by the gas controller substrate 30 on the outlet side of the second electromagnetic valve 27. The first electromagnetic valve 26, the second electromagnetic valve 27, and the proportional valve 35 are arranged in a unit body 45a. The gas from the primary gas supply pipe 25a moves in the order of the first electromagnetic valve 26 → the second electromagnetic valve 27 → the proportional valve 35, moves through the secondary gas supply pipe 25b, and is supplied to the gas burner 13. It has become. The first solenoid valve 26 and the second solenoid valve 27 are two-position type shut-off valves that are displaced to an open position for opening a gas passage formed in the unit main body 45a and a closed position for closing. Then, the gas controller board 30 controls the first electromagnetic valve 26 and the second electromagnetic valve 27 to be closed to shut off the supply of gas from the primary gas supply pipe 25a to the gas burner 13, and the first electromagnetic valve 26 By controlling the second electromagnetic valve 27 to the open state, the gas supply from the primary gas supply pipe 25a to the gas burner 13 is permitted.

(Proportional valve)
The proportional valve 35 is a gas supply amount adjusting means that can adjust the valve opening degree based on the opening / closing control by the gas controller substrate 30 and can increase / decrease the gas supply amount (flow rate) to the gas burner 13. Then, the secondary gas pressure in the secondary gas supply pipe 25b increases and decreases in proportion to the valve opening of the proportional valve 35, and the proportional valve 35 is connected to the secondary gas gas in the secondary gas supply pipe 25b. It is also a secondary pressure adjusting means for increasing or decreasing the pressure. The proportional valve 35 variably controls the current value applied to the proportional valve 35 based on PWM (Pulse Width Modulation) control by the gas controller board 30 and PD (proportional differentiation) control of the display board 31 to control the valve. Opening and closing is performed. The proportional valve 35 can adjust the valve opening steplessly between 0 to 100% in proportion to the current value applied from the gas controller board 30, and the gas supply amount to the gas burner 13 can be adjusted. It is configured so that it can be adjusted steplessly. In other words, the proportional valve 35 increases the valve opening as the applied current value increases, increasing the gas supply amount to the gas burner 13 and increasing / decreasing the gas secondary pressure in the secondary gas supply pipe 25b. It is configured. In addition, a gas secondary pressure detection sensor S1 (FIG. 5) is provided in front of the burner portion 42 of the gas burner 13 in the secondary gas supply pipe 25b as pressure detecting means capable of detecting the gas secondary pressure in the secondary gas supply pipe 25b. 4). Gas secondary pressure data from the gas secondary pressure detection sensor S <b> 1 is transmitted to the gas controller board 30.

(About gas burner combustion control)
Next, the combustion control of the gas burner 13 implemented in the gas fryer 10 of an Example is demonstrated. In the gas fryer 10 having the gas burner 13, the combustion gas generated by the combustion of the gas in the gas burner 13 moves through the combustion gas passage 14 defined between the oil tank 12 and the inner box 21. The oil temperature of the cooking oil in the oil tank 12 that is in contact with the oil tank 12 and that has risen in temperature is raised to a cooking temperature that is suitable for cooking ingredients. The combustion gas after heat exchange with the oil tank 12 moves from the combustion gas passage 14 into the exhaust duct 15, moves upward in the exhaust duct 15, and then is discharged to the outside. Here, when the combustion gas moves upward in the exhaust duct 15, the draft effect (chimney effect) occurs, and the intake effect 24 (see FIG. 2) provided in the main body 11 is generated based on the draft effect. Then, combustion air is taken into the main body 11.

  However, when the operation of the gas fryer 10 is started, the oil tank 12 and the exhaust duct 15 are cooled to room temperature, and the air staying in the combustion gas passage 14 and the exhaust duct 15 is also cooled similarly. Immediately after the combustion of the gas burner 13 is started, the draft effect is hardly generated in the exhaust duct 15. For this reason, when gas is supplied to the gas burner 13 with the valve opening degree of the proportional valve 35 set to full open or close to full open, the combustion air necessary for combustion of the gas can be taken in from the intake port 24. However, the concentration of carbon monoxide contained in the combustion gas is extremely increased due to incomplete combustion.

  Therefore, in the gas fryer 10 according to the embodiment, from the combustion start of the gas burner 13 based on the start of operation until the draft effect by the exhaust duct 15 is generated, it is different from the normal combustion mode in which the draft effect is generated. By performing combustion in the gas burner 13 in the combustion mode, the occurrence of incomplete combustion is suppressed. Therefore, the gas burner combustion control will be specifically described below with reference to examples.

  FIG. 6 is a timing chart relating to gas burner combustion control. In the gas burner combustion control of the embodiment, “normal combustion mode” executed when the draft effect by the exhaust duct 15 is generated and “initial combustion” executed when the draft effect by the exhaust duct 15 is not generated. Mode "is set. In the normal combustion mode, the gas burner 13 is adjusted with the valve opening degree of the proportional valve 35 set to “high” so that the gas secondary pressure before the burner portion 42 in the gas burner 13 becomes a pressure set during normal combustion. This is a combustion mode in which 13 combustions are executed. In the initial combustion mode, the valve opening of the proportional valve 35 is adjusted to “low” so that the gas secondary pressure before the burner portion 42 in the gas burner 13 is lower than the gas secondary pressure during normal combustion. This is a combustion mode in which the combustion of the gas burner 13 is performed.

  Here, the opening degree of the proportional valve 35 in the initial combustion mode and the normal combustion mode differs depending on the type of gas used for the combustion of the gas burner 13. In the embodiment, as shown in FIG. 18 (a), in the city gas, the gas secondary pressure at the valve opening “high” corresponding to the normal combustion mode is set to 1.7 kPa, and the valve corresponding to the initial combustion mode is opened. The gas secondary pressure at the degree “low” is set to 1.3 kPa. For LP gas, the gas secondary pressure at the valve opening “high” corresponding to the normal combustion mode is set to 2.5 kPa, and the gas secondary pressure at the valve opening “low” corresponding to the initial combustion mode is set to 1. It is set to 0.7 kPa. Further, the valve opening degree of the proportional valve 35 in the initial combustion mode and the normal combustion mode can be changed by the difference in gas consumption of the gas burner 13 even if the kind of gas is the same.

  In the gas burner combustion control of the embodiment, immediately after the combustion of the gas burner 13 is started, no draft effect is generated in the exhaust duct 15, so the combustion of the gas burner 13 is started in the initial combustion mode. Then, during the combustion of the gas burner 13 in the initial combustion mode, a predetermined determination process (draft effect determination process) is performed to determine whether or not the draft effect has occurred. The combustion mode is switched from the normal combustion mode to the normal combustion mode, and the combustion of the gas burner 13 is continued in the normal combustion mode. The draft effect determination process can be implemented in various modes as will be described later.

  Next, the gas burner combustion control of the embodiment will be described with reference to the timing chart shown in FIG. 6 and the flowchart shown in FIG. In the gas burner combustion control of the embodiment, when the power switch ELB of the gas fryer 10 is ON-controlled, the proportional valve 35 controlled by the control unit of the gas controller substrate 30 is set for a predetermined time (6 seconds in the embodiment). As a result, the operation of the proportional valve 35 is confirmed (see FIG. 6). In the embodiment, by applying a current of 180 mA to the proportional valve 35, the proportional valve 35 is controlled to be fully opened. The control for fully opening the proportional valve 35 is performed only once before the operation button 51 is turned on.

  When the operation button 51 is turned on for a predetermined time (1 second in the embodiment) (step SM1), the control unit of the gas controller board 30 turns the first electromagnetic valve 26 and the second electromagnetic valve 27 on. Each is controlled to an open position (step SM2). Then, the spark plug 43 is operated (step SM3), and the valve opening degree of the proportional valve 35 is controlled to be “low” in a state where the spark plug 43 is operated (step SM4). Thereby, the gas is supplied from the secondary gas supply pipe 25b of the gas supply pipe 25 to the burner portion 42 of the gas burner 13, and the gas is ignited by the spark of the spark plug 43, and the gas burner 13 starts combustion in the initial combustion mode ( Step SM5).

  Then, when the gas burner 13 starts combustion in the initial combustion mode, the control unit of the gas controller substrate 30 executes “draft effect determination processing” for determining whether or not the draft effect has occurred in the exhaust duct 15 (step SM6). The combustion of the gas burner 13 in the initial combustion mode is continued until it is determined in the draft effect determination process in step SM6 that the draft effect has occurred. The embodiment of the draft effect determination process will be described later in detail.

  When it is determined in the draft effect determination process in step SM6 that the draft effect has occurred in the exhaust duct 15, the control unit of the gas controller board 30 ends the draft effect determination process, and controls the valve of the proportional valve 35. The opening degree is controlled to be “high” (step SM7). As a result, the gas secondary pressure in front of the burner portion 42 in the gas burner 13 is increased, so that the combustion mode is switched from the initial combustion mode to the normal combustion mode, and the gas burner 13 continues to burn in the normal combustion mode. (Step SM8).

  Then, (1) when the operation button 51 is turned OFF, or (2) when the oil temperature Tb of the cooking oil reaches a predetermined set temperature (step SM9), the control unit of the gas controller board 30 A closing process is executed (step SM10). By this valve closing process, the first electromagnetic valve 26 and the second electromagnetic valve 27 are controlled to the closed position, and the proportional valve 35 is also controlled to the closed position. By closing the first electromagnetic valve 26, the second electromagnetic valve 27, and the proportional valve 35, the supply of gas from the gas supply pipe 25 to the gas burner 13 is shut off, and combustion in the gas burner 13 is stopped. The valve closing process will be described later in detail.

  Next, an embodiment of the draft effect determination process performed in the gas burner combustion control will be described below.

(First embodiment)
FIG. 8 is a flowchart showing a first embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In executing the draft effect determination process of the first embodiment, the storage unit of the gas controller substrate 30 has a time from the start of combustion in the gas burner 13 in the initial combustion mode until the draft effect occurs in the exhaust duct 15 (hereinafter referred to as the draft effect determination process). Tc) (referred to as “combustion mode switching time”) is stored in advance. This combustion mode switching time Tc is obtained by a combustion test performed in the development stage of the gas fryer 10 of the embodiment, and differs depending on the type of the gas fryer 10. Further, the gas fryer 10 is provided with a timer T as a time measuring means for measuring the combustion mode switching time Tc. In the embodiment, as shown in FIG. 4, the gas controller board 30 includes a timer circuit that forms a timer T, and the time counted by the timer T is input to the control unit of the gas controller board 30. Thereby, in the draft effect determination process of the first embodiment, at the timing when the timer T measures the combustion mode switching time Tc, the control unit of the gas controller substrate 30 changes the valve opening of the proportional valve 35 from “low” to “ It is possible to execute control to change to “high”.

  In the draft effect determination process of the first embodiment, the control unit of the gas controller substrate 30 starts the timer T immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. 7 (step S11). . Then, it is determined whether or not the timer T has counted the combustion mode switching time Tc (step S12). Here, since the process waits in step S12 until the combustion mode switching time Tc elapses, the combustion of the gas burner 13 in the initial combustion mode is continued. When it is determined in step S12 that the timer T has counted the combustion mode switching time Tc, the draft effect determination process is terminated, and the process proceeds to step SM7 of the gas burner combustion control shown in FIG. Control for changing the valve opening of 35 to “high” is executed.

  Therefore, in the gas burner combustion control for executing the draft effect determination process of the first embodiment, the gas secondary pressure of the gas before the gas burner 13 is set from the time of normal combustion until immediately after the start of combustion of the gas burner 13 until the draft effect occurs. The combustion of the gas burner 13 is performed in the initial combustion mode that is lowered. Therefore, in the state where the draft effect immediately after the start of combustion of the gas burner 13 is not sufficiently generated, the gas secondary pressure is lowered and the combustion of the gas burner 13 is executed, so that incomplete combustion hardly occurs and is included in the combustion gas. It is possible to suppress the concentration of carbon monoxide to be increased. In addition, after the draft effect has occurred in the exhaust duct 15, the combustion of the gas burner 13 is performed in the normal combustion mode in which the gas secondary pressure is higher than that in the initial combustion mode, so that it is necessary to heat the oil tank 12 and cooking oil. It is possible to minimize the increase in time, and it is possible to prevent the food cooking operation from being hindered. In the draft effect determination process of the first embodiment, the combustion mode switching time Tc is set in advance as the time required from the start of combustion of the gas burner 13 until the draft effect occurs. As a result, only the control is performed so that the combustion of the gas burner 13 is performed in the initial combustion mode until the combustion mode switching time Tc elapses from the start of the combustion of the gas burner 13, and the draft effect is produced without performing complicated control Before, it can suppress appropriately and reliably that the density | concentration of the carbon monoxide contained in combustion gas increases.

(Second embodiment)
FIG. 9 is a flowchart showing a second embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In the draft effect determination process according to the second embodiment, the control unit of the gas controller substrate 30 sets the combustion mode switching time Tc based on the oil temperature data detected by the oil temperature detection sensor 19. It has become. That is, when the oil temperature Tb is lowered to about the normal temperature, the air staying in the combustion gas passage 14 and the exhaust duct 15 is also lowered to the normal temperature. The time until the draft effect occurs becomes longer. On the other hand, when the oil temperature Tb is rising, the air staying in the combustion gas passage 14 and the exhaust duct 15 is also rising to a temperature close to the oil temperature Tb. A draft effect occurs in a short time. Therefore, it is possible to perform appropriate gas burner combustion control by executing the setting program based on the oil temperature data detected by the oil temperature detection sensor 19 and changing the setting of the combustion mode switching time Tc.

  Here, in the embodiment, as shown in FIG. 18B, the time setting of the combustion mode switching time Tc is changed with the oil temperature Tb of the cooking oil set to 85 ° C. as a criterion. Further, the set time of the combustion mode switching time Tc varies depending on the type of gas used for the combustion of the gas burner 13. Specifically, in the city gas, when the oil temperature Tb of the cooking oil is less than 85 ° C., the combustion mode switching time Tc is set to 90 seconds, and when the oil temperature Tb of the cooking oil is 85 ° C. or more, the combustion mode switching time Tc is 10 Is set to seconds. For LP gas, when the oil temperature Tb of the cooking oil is less than 85 ° C., the combustion mode switching time Tc is set to 120 seconds, and when the oil temperature of the cooking oil is 85 ° C. or more, the combustion mode switching time Tc is set to 10 seconds. ing.

  In the draft effect determination process of the second embodiment, the control unit of the gas controller board 30 obtains the oil temperature data from the oil temperature detection sensor 19 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. Confirmation (step S21). And the control part of the gas controller board | substrate 30 sets combustion mode switching time Tc based on oil temperature data (step S22). Thereby, the control part of the gas controller board | substrate 30 starts the time measurement of the timer T (step S23). Steps S21 and S22 are processed in a very short time, and the timer T starts measuring time immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. Next, it is determined whether or not the timer T has timed the combustion mode switching time Tc (step S24), and when it is determined that the timer T has timed the combustion mode switching time Tc, the draft effect determination processing ends. Then, the process shifts to step SM7 of the gas burner combustion control shown in FIG. 7, and the control for changing the valve opening of the proportional valve 35 to “high” is executed.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the second embodiment, the time required from the start of combustion of the gas burner 13 to the generation of the draft effect based on the oil temperature Tb of the cooking oil stored in the oil tank 12. A certain combustion mode switching time Tc is set. Thereby, the combustion of the gas burner 13 is executed in the initial combustion mode from the start of combustion of the gas burner 13 until the combustion mode switching time Tc set based on the oil temperature Tb of the cooking oil elapses. It is possible to appropriately and reliably suppress the increase in the concentration of carbon monoxide contained in the combustion gas. And when the oil temperature Tb of cooking oil is low, since it takes time until the draft effect in the exhaust duct 15 arises, it can prevent shifting to normal combustion mode before a draft effect arises. In addition, when the cooking oil oil temperature Tb is high, it does not take time until the draft effect in the exhaust duct 15 occurs, so that it is possible to prevent the initial combustion mode from continuing despite the draft effect.

(Third embodiment)
FIG. 10 is a flowchart showing a third embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In executing the draft effect determination processing in the third embodiment, the exhaust duct 15 is provided with a gas temperature detection sensor S2 as gas temperature detection means for detecting the temperature of the combustion gas passing through the exhaust duct 15. (See Figure 4). In addition, a gas temperature (hereinafter referred to as “combustion mode switching temperature”) Td, which serves as a reference for determination of switching of the combustion mode, is stored in the storage unit of the gas controller board 30 in advance in which the draft effect occurs in the exhaust duct 15. Yes. This combustion mode switching temperature Td is obtained from the result of a combustion test performed in the development stage of the gas fryer 10 of the example.

  Here, when the gas temperature of the combustion gas detected by the gas temperature detection sensor S2 is lower than the combustion mode switching temperature Td, the draft effect does not occur in the exhaust duct 15. On the other hand, when the gas temperature of the combustion gas detected by the gas temperature detection sensor S2 is equal to or higher than the combustion mode switching temperature Td, a draft effect is generated in the exhaust duct 15. Therefore, the gas controller board 30 can perform appropriate gas burner combustion control by comparing the gas temperature of the combustion gas detected by the gas temperature detection sensor S2 with the combustion mode switching temperature Td. In addition, since the draft effect can occur when the gas temperature of the combustion gas that moves upward in the exhaust duct 15 is 200 ° C. or higher, in the embodiment, the combustion mode switching temperature Td is set to 200 ° C. It is.

  In the draft effect determination process of the third embodiment, the control unit of the gas controller substrate 30 first detects the gas temperature data from the gas temperature detection sensor S2 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. Is confirmed (step S31). And the control part of the gas controller board | substrate 30 determines whether gas temperature data is more than combustion mode switching temperature Td (step S32). Then, by waiting until the gas temperature data becomes equal to or higher than the combustion mode switching temperature Td, the combustion of the gas burner 13 is continued in the initial combustion mode. When the gas temperature data is equal to or higher than the combustion mode switching temperature Td, the draft effect determination process is terminated, and the routine proceeds to step SM7 of the gas burner combustion control shown in FIG. Control is executed to change to “high”.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the third embodiment, the gas temperature of the combustion gas that passes through the exhaust duct 15 is detected, and the combustion mode switching temperature Td that serves as a determination criterion for switching the combustion mode and the Since the combustion mode switching determination is performed by comparing with the gas temperature, it is possible to more appropriately and reliably suppress the increase in the concentration of carbon monoxide contained in the combustion gas before the draft effect occurs.

(Fourth embodiment)
FIG. 11 is a flowchart showing a fourth embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. When executing the draft effect determination process in the fourth embodiment, the main body 11 of the gas fryer 10 is provided with a humidity detection sensor S3 as humidity detection means for detecting the humidity of the air (see FIG. 4). In addition, the storage mode of the gas controller board 30 stores in advance the combustion mode switching time Tc from the start of combustion in the gas burner 13 in the initial combustion mode until the draft effect occurs in the exhaust duct 15. Further, the gas fryer 10 is provided with a timer T as a time measuring means for measuring the combustion mode switching time Tc.

  And the control part of the said gas controller board | substrate 30 is comprised so that the setting of the said combustion mode switching time Tc may be correct | amended based on the humidity data from the said humidity detection sensor S3. That is, the control unit of the gas controller substrate 30 stores a setting program for setting the combustion mode switching time Tc based on the humidity data. Here, the higher the humidity of the air used for combustion in the gas burner 13 is, the higher the humidity of the generated combustion gas is, so that the time until the draft effect is generated in the exhaust duct 15 becomes longer. In addition, when the humidity of the air used for combustion in the gas burner 13 is low, the humidity of the generated combustion gas is low, so that the draft effect in the exhaust duct 15 is short in comparison with the case where the humidity is high. Arise. Therefore, the gas controller board 30 performs appropriate gas burner combustion control by executing the setting program and correcting the setting of the combustion mode switching time Tc based on the humidity data of the air detected by the humidity detection sensor S3. Is possible.

  In the draft effect determination process of the fourth embodiment, the control unit of the gas controller board 30 confirms the humidity data from the humidity detection sensor S3 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. (Step S41). And the control part of the gas controller board | substrate 30 sets combustion mode switching time Tc based on humidity data (step S42). Thereby, the control part of the gas controller board | substrate 30 starts the time measurement of the timer T (step S43). Steps S41 and S42 are processed in an extremely short time, and the timer T starts to time immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. Next, it is determined whether or not the timer T has counted the combustion mode switching time Tc (step S44). Here, since the process waits in step S44 until the combustion mode switching time Tc elapses, the combustion of the gas burner 13 is continued in the initial combustion mode. If it is determined in step S44 that the timer T has counted the combustion mode switching time Tc, the draft effect determination process is terminated, the process proceeds to step SM7 of the gas burner combustion control shown in FIG. Control for changing the valve opening of 35 to “high” is executed.

  Therefore, in the gas burner combustion control for executing the draft effect determination process of the fourth embodiment, the time required from the start of combustion of the gas burner 13 to the generation of the draft effect is based on the humidity of air used for combustion in the gas burner 13. A certain combustion mode switching time Tc is set. Thereby, the combustion of the gas burner 13 is executed in the initial combustion mode from the start of combustion of the gas burner 13 until the combustion mode switching time Tc corrected based on the humidity of the air elapses. Therefore, before the draft effect occurs, the combustion gas The increase in the concentration of carbon monoxide contained in can be appropriately and reliably suppressed.

(Fifth embodiment)
FIG. 12 is a flowchart showing a fifth embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. When executing the draft effect determination process in the fifth embodiment, the main body 11 of the gas fryer 10 is provided with a humidity detection sensor S3 as humidity detection means for detecting the humidity of the air (see FIG. 4). Further, the exhaust duct 15 is provided with a gas temperature detection sensor S2 as gas temperature detection means for detecting the temperature of the combustion gas passing through the exhaust duct 15 (see FIG. 4).

  And the control part of the said gas controller board | substrate 30 correct | amends the setting of the said combustion mode switching temperature Td based on the humidity data from the said humidity detection sensor S3. That is, the storage unit of the gas controller board 30 stores a setting program for setting the combustion mode switching temperature Td based on the humidity data. Here, the higher the humidity of the air used for the combustion in the gas burner 13, the higher the humidity of the generated combustion gas, and the higher the gas temperature at which the draft effect occurs in the exhaust duct 15. Therefore, the control unit of the gas controller board 30 executes the setting program based on the humidity data to set the combustion mode switching temperature high when the air humidity is high, and to switch when the air humidity is low. The temperature is set low. Thereby, in the gas burner combustion control based on the draft effect determination process of the fifth embodiment, it is possible to perform appropriate gas burner combustion control by correcting the setting of the combustion mode switching temperature Td based on the humidity of the air. .

  In the draft effect determination process of the fifth embodiment, the control unit of the gas controller board 30 confirms the humidity data from the humidity detection sensor S3 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. (Step S51). And the control part of the gas controller board | substrate 30 sets the combustion mode switching temperature Td used as the determination criterion of a combustion mode switching based on humidity data (step S52). Next, the control unit of the gas controller substrate 30 determines whether or not the gas temperature data is equal to or higher than the combustion mode switching temperature Td (step S53). The combustion of the gas burner 13 is continued in the initial combustion mode by waiting in step S53 until the gas temperature data becomes equal to or higher than the combustion mode switching temperature Td. When the gas temperature data is equal to or higher than the combustion mode switching temperature Td, the draft effect determination process is terminated, and the routine proceeds to step SM7 of the gas burner combustion control shown in FIG. Control is executed to change to “high”.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the fifth embodiment, the combustion mode switching temperature Td that is the determination criterion for switching the combustion mode is set based on the humidity of the air used for the combustion in the gas burner 13. Is done. Since the gas temperature of the combustion gas passing through the exhaust duct 15 is detected and the combustion mode switching temperature Td corrected based on the humidity of the air is compared with the gas temperature, the combustion mode switching determination is performed. Before the draft effect occurs, it is possible to appropriately and reliably suppress an increase in the concentration of carbon monoxide contained in the combustion gas.

(Sixth embodiment)
FIG. 13 is a flowchart showing a sixth embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In carrying out the draft effect determination process in the sixth embodiment, the body 11 of the gas fryer 10 is provided with a room temperature detection sensor S4 as air temperature detection means for detecting the air temperature (room temperature) (see FIG. 4). . Further, the combustion mode switching time Tc is stored in the storage unit of the gas controller substrate 30. Further, the gas fryer 10 is provided with a timer T as a time measuring means for measuring the combustion mode switching time Tc.

  And the control part of the said gas controller board | substrate 30 is comprised so that the setting of the said combustion mode switching time Tc may be correct | amended based on the room temperature data from the said room temperature detection sensor S4. That is, the control unit of the gas controller substrate 30 stores a setting program for setting the combustion mode switching time Tc based on room temperature data. Here, the higher the temperature of the air used for combustion in the gas burner 13, the higher the humidity of the combustion gas. As described above, when the humidity of the combustion gas becomes higher, the draft effect is produced in the exhaust duct 15. The time will be longer. Therefore, the control unit of the gas controller board 30 executes the setting program based on the room temperature data detected by the room temperature detection sensor S4, thereby setting the combustion mode switching time Tc longer when the air temperature (room temperature) is high. However, when the temperature of the air is low, the combustion mode switching time Tc is set to be short so that appropriate gas burner combustion control can be performed.

  In the draft effect determination process of the sixth embodiment, the control unit of the gas controller board 30 confirms the room temperature data from the room temperature detection sensor S4 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. (Step S61). And the control part of the gas controller board | substrate 30 sets combustion mode switching time Tc based on room temperature data (step S62). Thereby, the control part of the gas controller board | substrate 30 starts the time measurement of the timer T (step S63). The steps S61 and S62 are processed in an extremely short time, and the timer T starts to time immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. Next, it is determined whether or not the timer T has counted the combustion mode switching time Tc (step S64). Here, since the process waits in step S64 until the combustion mode switching time Tc elapses, the combustion of the gas burner 13 is continued in the initial combustion mode. If it is determined in step S64 that the timer T has counted the combustion mode switching time Tc, the draft effect determination process is terminated, the process proceeds to step SM7 of the gas burner combustion control shown in FIG. Control for changing the valve opening of 35 to “high” is executed.

  Therefore, in the gas burner combustion control for executing the draft effect determination process of the sixth embodiment, the time required from the start of combustion of the gas burner 13 to the generation of the draft effect is based on the temperature of air used for combustion in the gas burner 13. A certain combustion mode switching time Tc is set. Thus, the combustion of the gas burner 13 is performed in the initial combustion mode from the start of the combustion of the gas burner 13 until the combustion mode switching time Tc corrected based on the temperature of the air elapses. It can suppress appropriately and reliably that the density | concentration of the carbon monoxide contained in gas increases.

(Seventh embodiment)
FIG. 14 is a flowchart showing a seventh embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In executing the draft effect determination process in the seventh embodiment, a room temperature detection sensor S4 for detecting the temperature of the air (room temperature) is provided in the main body 11 of the gas fryer 10 (see FIG. 4). Further, the exhaust duct 15 is provided with a gas temperature detection sensor S2 as gas temperature detection means for detecting the temperature of the combustion gas passing through the exhaust duct 15 (see FIG. 4).

  And the control part of the said gas controller board | substrate 30 is comprised so that the setting of the said combustion mode switching temperature Td may be correct | amended based on the humidity data from the said room temperature detection sensor S4. That is, a setting program for setting the combustion mode switching temperature Td based on the room temperature data is stored in the storage unit of the gas controller substrate 30. Here, the higher the temperature (room temperature) of the air used for combustion in the gas burner 13, the higher the humidity of the generated combustion gas, and the higher the gas temperature at which the draft effect occurs in the exhaust duct 15. Therefore, the control unit of the gas controller board 30 executes the setting program based on the room temperature data, so that the combustion mode switching temperature is set high when the room temperature is high, and the switching temperature is set low when the room temperature is low. It is supposed to be. Thereby, in the gas burner combustion control based on the draft effect determination process of the seventh embodiment, it is possible to perform appropriate combustion control by correcting the setting of the combustion mode switching temperature Td based on the room temperature.

  In the draft effect determination process of the seventh embodiment, the control unit of the gas controller board 30 confirms the room temperature data from the room temperature detection sensor S4 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. (Step S71). And the control part of the gas controller board | substrate 30 sets combustion mode switching temperature Td used as the determination criterion of combustion mode switching based on room temperature data (step S72). Next, the control unit of the gas controller substrate 30 checks whether or not the gas temperature data detected by the gas temperature detection sensor S2 is equal to or higher than the combustion mode switching temperature Td (step S73). The combustion of the gas burner 13 is continued in the initial combustion mode by waiting in step S73 until the gas temperature data becomes equal to or higher than the combustion mode switching temperature Td. When the gas temperature data is equal to or higher than the combustion mode switching temperature Td, the draft effect determination process is terminated, and the routine proceeds to step SM7 of the gas burner combustion control shown in FIG. Control is executed to change to “high”.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the seventh embodiment, the combustion mode switching temperature that serves as a determination criterion for switching the combustion mode based on the temperature (room temperature) of air used for combustion in the gas burner 13. Td is set. Then, the gas temperature of the combustion gas passing through the exhaust duct 15 is detected, and the combustion mode switching temperature Td corrected based on the air temperature (room temperature) is compared with the gas temperature to determine the combustion mode switching. Therefore, the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed before the draft effect occurs.

(Eighth embodiment)
FIG. 15 is a flowchart showing an eighth embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In performing the draft effect determination process in the eighth embodiment, the pressure detection means detects the primary pressure of the gas supplied from the gas supply source to the primary gas supply pipe 25a of the gas supply pipe 25 in the gas fryer 10. The gas primary pressure detection sensor S5 is provided (see FIG. 4). The gas primary pressure detection sensor S5 inputs the detected gas primary pressure to the control unit of the gas controller board 30. In addition, the gas fryer 10 includes a timer T that measures the combustion mode switching time Tc.

  And the control part of the said gas controller board | substrate 30 is comprised so that the setting of the said combustion mode switching time Tc may be correct | amended based on the gas primary pressure data from the said gas primary pressure detection sensor S5. That is, a setting program for setting the combustion mode switching time Tc according to the primary gas pressure is stored in the control unit of the gas controller substrate 30. Here, the higher the gas primary pressure of the gas supplied from the gas supply source, the higher the humidity of the combustion gas. As described above, when the humidity of the combustion gas increases, a gas that produces a draft effect in the exhaust duct 15. The temperature rises. Therefore, the control unit of the gas controller board 30 executes the setting program based on the gas primary pressure data detected by the gas primary pressure detection sensor S5, so that when the gas primary pressure is high, the combustion mode switching time. When Tc is set long and the primary gas pressure is low, the combustion mode switching time Tc is set short, and appropriate gas burner combustion control can be performed.

  In the draft effect determination process according to the eighth embodiment, the control unit of the gas controller substrate 30 performs the gas 1 from the gas primary pressure detection sensor S5 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. Next pressure data is confirmed (step S81). And the control part of the gas controller board | substrate 30 sets combustion mode switching time Tc based on gas primary pressure data (step S82). Thereby, the control part of the gas controller board | substrate 30 starts the time measurement of the timer T (step S83). Steps S81 and S82 are processed in an extremely short time, and the timer T starts measuring immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion control of FIG. Next, it is determined whether or not the timer T has counted the combustion mode switching time Tc (step S84). Here, since the process waits in step S84 until the combustion mode switching time Tc elapses, the combustion of the gas burner 13 is continued in the initial combustion mode. In step S84, when it is determined that the timer T has counted the combustion mode switching time Tc, the draft effect determination process is terminated, and the process proceeds to step SM7 of the gas burner combustion control shown in FIG. Control for changing the valve opening of 35 to “high” is executed.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the eighth embodiment, the time required from the start of combustion of the gas burner 13 to the generation of the draft effect is based on the primary gas pressure of the gas supplied to the gas burner 13. A certain combustion mode switching time Tc is set. As a result, the combustion of the gas combustion means is performed in the initial combustion mode from the start of combustion of the gas burner 13 until the combustion mode switching time Tc corrected based on the primary gas pressure has elapsed, before the draft effect occurs. It is possible to appropriately and reliably suppress the increase in the concentration of carbon monoxide contained in the combustion gas.

(Ninth embodiment)
FIG. 16 is a flowchart showing a ninth embodiment of the draft effect determination process executed in step SM6 of the gas burner combustion control shown in FIG. In performing the draft effect determination process in the ninth embodiment, the pressure detection means for detecting the primary pressure of the gas supplied from the gas supply source to the primary gas supply pipe 25a of the gas supply pipe 25 in the gas fryer 10 The gas primary pressure detection sensor S5 is provided (see FIG. 4). The gas primary pressure detection sensor S5 inputs the detected gas primary pressure to the control unit of the gas controller board 30. Further, the exhaust duct 15 is provided with a gas temperature detection sensor S2 as gas temperature detection means for detecting the temperature of the combustion gas passing through the exhaust duct 15 (see FIG. 4).

  And the control part of the gas controller board | substrate 30 is comprised so that the setting of the said combustion mode switching temperature Td may be correct | amended based on the gas primary pressure data from the said gas primary pressure detection sensor S5. That is, the storage unit of the gas controller board 30 stores a setting program for setting the combustion mode switching temperature Td based on the gas primary pressure data. Here, the higher the gas primary pressure of the gas supplied from the gas supply source, the higher the humidity of the combustion gas, and the higher the gas temperature at which the draft effect occurs in the exhaust duct 15. Therefore, the control unit of the gas controller board 30 executes the setting program based on the gas primary pressure data to set the combustion mode switching temperature Td high when the gas primary pressure is high, and the gas primary pressure. When the temperature is low, the combustion mode switching temperature Td is set low. Thereby, in the gas burner combustion control based on the draft effect determination process of the ninth embodiment, it is possible to perform appropriate combustion control by correcting the setting of the combustion mode switching temperature Td based on the primary gas pressure. .

  In the draft effect determination process of the ninth embodiment, the control unit of the gas controller board 30 detects the gas detected by the gas primary pressure detection sensor S5 immediately after the start of combustion of the gas burner 13 in step SM5 of the gas burner combustion process of FIG. The primary pressure data is confirmed (step S91). And the control part of the gas controller board | substrate 30 sets combustion mode switching temperature Td used as the combustion mode switching determination reference | standard based on gas primary pressure data (step S92). Next, the control unit of the gas controller board 30 checks whether or not the gas temperature data detected by the gas temperature detection sensor S2 is equal to or higher than the combustion mode switching temperature Td (step S93). The combustion of the gas burner 13 is continued in the initial combustion mode by waiting in step S93 until the gas temperature data becomes equal to or higher than the combustion mode switching temperature Td. When the gas temperature data is equal to or higher than the combustion mode switching temperature Td, the draft effect determination process is terminated, and the routine proceeds to step SM7 of the gas burner combustion control shown in FIG. Control is executed to change to “high”.

  Therefore, in the gas burner combustion control that executes the draft effect determination process of the ninth embodiment, the combustion mode switching temperature Td that is a determination criterion for switching the combustion mode is set based on the gas primary pressure of the gas supplied to the gas burner 13. Is done. Since the gas temperature of the combustion gas passing through the exhaust duct 15 is detected and the combustion mode switching temperature Td corrected based on the gas primary pressure is compared with the gas temperature, the combustion mode switching determination is performed. Before the draft effect occurs, the increase in the concentration of carbon monoxide contained in the combustion gas can be appropriately and reliably suppressed.

(About opening and closing of solenoid valve and proportional valve)
As shown in FIGS. 2 and 4, the gas fryer 10 of the embodiment includes a first electromagnetic valve 26 and a second electromagnetic valve 27 of the same type that are controlled to be opened and closed by a gas controller substrate 30 in the middle of the gas supply pipe 25. In addition to being arranged in series, a proportional valve 35 is arranged between the second electromagnetic valve 27 and the gas burner 13. By arranging the first solenoid valve 26 and the second solenoid valve 27 of the same type in series, one of the first or second solenoid valves 26 and 27 should not be controlled to the closed position due to malfunction. Even if it becomes, by operating the other solenoid valve normally, combustion of the gas burner 13 can be surely stopped and gas leakage from the burner portion 42 can be prevented.

  When the gas is supplied to the gas burner 13 through the gas supply pipe 25 in order to start combustion in the gas burner 13, all of the first electromagnetic valve 26, the second electromagnetic valve 27 and the proportional valve 35 are opened. Thus, the gas can be supplied to the gas burner 13 through the secondary gas supply pipe 25b. Here, in the embodiment, as shown in FIG. 6, first, the first solenoid valve 26 and the second solenoid valve 27 are simultaneously set to the open position, and then the proportional valve 35 with a predetermined time difference (0.5 seconds in the embodiment). Is to be released. Then, the spark plug 43 is operated simultaneously with the opening of the first solenoid valve 26 and the second solenoid valve 27, and the proportional valve 35 is opened while the spark plug 43 is operating. The reached gas is ignited. That is, since the spark plug 43 does not operate after the gas reaches the burner portion 42 of the gas burner 13, it is possible to prevent the gas from being ignited in a state where the gas is filled in the burner portion 42. ing.

  On the other hand, in order to stop the combustion in the gas burner 13, when stopping the supply of gas to the gas burner 13, at least one of the first electromagnetic valve 26, the second electromagnetic valve 27 and the proportional valve 35 is closed. The gas supply to the gas burner 13 becomes impossible by being in the position, and the first electromagnetic valve 26, the second electromagnetic valve 27 and the proportional valve 35 are all in the closed position, so that the gas can be surely shut off. . Here, in the embodiment, as shown in FIG. 6, first, after controlling one of the first solenoid valve 26 or the second solenoid valve 27 to the closed position, a predetermined time difference (3 in the embodiment) is set. (Second), the other electromagnetic valve is controlled to the closed position (FIG. 6 illustrates the case where the second electromagnetic valve 27 is closed after the first electromagnetic valve 26 is closed). Further, the proportional valve 35 is controlled to the closed position at the closing timing of the electromagnetic valve that is closed later.

  In the embodiment, when the combustion of the gas burner 13 is stopped, the closing order of the first electromagnetic valve 26 and the second electromagnetic valve 27 is reversed every time the supply of gas to the gas burner 13 is stopped. Yes. That is, when stopping the gas supply in the previous combustion stop of the gas burner 13, the control unit of the gas controller board 30 first controls the first electromagnetic valve 26 to the closed position, and sets the second electromagnetic valve 27 with a time difference. In the case of controlling to the closed position, in the current combustion stop of the gas burner 13, the second electromagnetic valve 27 is first controlled to the closed position, and then the first electromagnetic valve 26 is controlled to the closed position with a time difference. In the next combustion stop of the gas burner 13, the first electromagnetic valve 26 is first controlled to the closed position, and then the second electromagnetic valve 27 is controlled to the closed position with a time difference.

  When the combustion of the gas burner 13 is stopped, the closing timing of the first electromagnetic valve 26 and the second electromagnetic valve 27 is made different and the closing order is reversed. This is to check for defects. That is, the first solenoid valve 26 and the second solenoid valve 27 are arranged in series, so that when one of the solenoid valves 26 and 27 is in the closed position, the other is in the open position. The movement of the gas to the secondary gas supply pipe 25b becomes impossible. For example, when the first solenoid valve 26 is first controlled to the closed position, the second solenoid valve 27 and the proportional valve 35 are open if the first solenoid valve 26 is normally operating in the closed position. Even so, the supply of gas to the gas burner 13 is stopped, and the gas burner 13 stops burning. However, even if the first electromagnetic valve 26 is controlled to the closed position, the gas supply to the gas burner 13 is not stopped and the combustion of the gas burner 13 is confirmed by the frame rod 44. The valve 26 is not in the normal closed position, and it is possible to find a malfunction of the first electromagnetic valve 26. Similarly, when the second electromagnetic valve 27 is first controlled to the closed position and the gas burner 13 is combusting without stopping the supply of gas to the gas burner 13, the second electromagnetic valve 27 is It is not in the normal closed position, and it is possible to find a malfunction of the second electromagnetic valve 27.

(About solenoid valve failure notification)
The gas fryer 10 of the embodiment is provided with a notification means 60 for notifying the failure of the electromagnetic valve when an operation failure of the first electromagnetic valve 26 or the second electromagnetic valve 27 is confirmed (see FIG. 4). The notification means 60 is electrically connected to the gas controller board 30 and is controlled by the gas controller board 30. As the notification means 60, a sound generating device such as a buzzer or a speaker that generates sound, a light emitting device including light emitting means such as an LED or a lamp, a signal transmitting device that transmits a signal to a mobile phone, a wireless device, or the like. It can be implemented. Therefore, when one of the first solenoid valve 26 and the second solenoid valve 27 malfunctions, the gas controller board 30 operates the notifying means 60 so that the malfunction of the solenoid valves 25 and 27 can be quickly performed. Can be notified.

(Valve closing process)
Next, the valve closing process executed in step SM10 of the gas burner combustion control shown in FIG. 7 will be described with reference to FIG. This valve closing process is performed when the operation button 51 is turned off in step SM9 in the gas burner combustion control, or when the oil temperature Tb of the cooking oil stored in the oil tank 12 reaches a predetermined set temperature. Executed. When the operation button 51 is turned off or the oil temperature Tb of the cooking oil stored in the oil tank 12 reaches a predetermined set temperature, the control unit of the gas controller board 30 first performs the previous valve closing process. The valve closing order of the first electromagnetic valve 26 and the second electromagnetic valve 27 is confirmed (step S100).

  When the control unit of the gas controller board 30 confirms that the first electromagnetic valve 26 has been closed first in the previous valve closing control process in step S100, the control unit first controls the second electromagnetic valve 27 to close ( Step S101). Next, it is confirmed based on the signal from the frame rod 44 whether or not the combustion of the gas burner 13 is stopped in accordance with the closing control of the second electromagnetic valve 27 (step S102). In step S102, when it is confirmed that the combustion in the gas burner 13 has stopped, the second electromagnetic valve 27 is operating normally. After 3 seconds), the first electromagnetic valve 26 and the proportional valve 35 are controlled to be closed (step S103). Thereby, the valve closing process ends.

  On the other hand, if it is not confirmed in step S102 that the combustion in the gas burner 13 has stopped, a malfunction of the second electromagnetic valve 27 has occurred, so the control unit of the gas controller board 30 The notifying means 60 is operated and controlled, and the notifying means 60 notifies the occurrence of the electromagnetic valve failure. Then, by closing the first electromagnetic valve 26 and the proportional valve 35 (step S103), the valve closing process ends.

  In addition, in step S100, the control unit of the gas controller board 30 confirms that the second electromagnetic valve 27 has been closed first in the previous valve closing control process (the first electromagnetic valve 26 has not been closed first). If this is the case, first the first electromagnetic valve 26 is controlled to be closed (step S105). Next, it is confirmed based on the signal from the frame rod 44 whether or not the combustion of the gas burner 13 has stopped as a result of closing control of the first electromagnetic valve 26 (step S106). In step S106, when it is confirmed that the combustion in the gas burner 13 has stopped, the first electromagnetic valve 26 is operating normally. After 3 seconds), the second electromagnetic valve 27 and the proportional valve 35 are controlled to be closed (step S107). Thereby, the valve closing process ends.

  On the other hand, if it is not confirmed in step S106 that the combustion in the gas burner 13 has stopped, a valve closing failure of the first electromagnetic valve 26 has occurred. Then, the operation of the notification means 60 is controlled, and the notification means 60 notifies the occurrence of a failure of the solenoid valve (step S108). Then, by closing the second electromagnetic valve 27 and the proportional valve 35 (step S107), the valve closing process ends.

  Therefore, the gas fryer 10 of the embodiment performs the closing sequence of the first electromagnetic valve 26 and the second electromagnetic valve 27 in reverse every time the supply of gas to the gas burner 13 is stopped by the valve closing process. The malfunction of the first electromagnetic valve 26 and the second electromagnetic valve 27 can be confirmed. In addition, the malfunction of the solenoid valve can be confirmed by simple control that only reverses the closing order of the first solenoid valve 26 and the second solenoid valve 27, and there is no need to provide a separate gas detection means. An increase in manufacturing cost can be suppressed. And it can prevent suitably that gas leaks generate | occur | produce from the burner part 42 of this gas burner 13 after the combustion stop of the gas burner 13. FIG.

(About abnormality notification by the display panel)
In addition to the gas secondary pressure detection sensor S1, the gas temperature detection sensor S2, the humidity detection sensor S3, the room temperature detection sensor S4, the gas primary pressure detection sensor S5, and the oil temperature detection sensor 19, the gas fryer 10 of the embodiment is not limited to the above. Are also provided with various detection means. That is, overheating detection means for preventing cooking oil in the oil tank 12 from being heated to a temperature higher than a predetermined cooking temperature when the oil temperature detection sensor 19 has failed, in a state where cooking oil is not stored in the oil tank 12. An air-burning detection means for preventing the gas burner 13 from burning, a disappearance detection means for detecting the supply of gas in a state where combustion is stopped due to an abnormality of the gas burner 13, a reverse flame detection means for the gas burner 13, and the like are provided. . When any of these detection means detects an abnormality, the notification means 60 notifies the abnormality.

  In addition, the gas fryer 10 of the embodiment is configured to perform abnormality notification on the oil temperature display panel 55 or the cooking time display panel 56 separately from the abnormality notification by the notification means 60. Here, the oil temperature display panel 55 and the cooking time display panel 56 are segment displays capable of displaying “0” to “9” numbers and alphabets such as “C” and “E”. Therefore, overheat abnormality by detection of overheat detection means, air blow abnormality by detection of air blow detection means, extinction abnormality by detection of extinction detection means, and reverse flame abnormality by operation of reverse flame detection means, respectively. Abnormality notifications can be made with numbers, letters, or a combination of numbers and letters. For example, “E1” is displayed for an overheat abnormality, “E2” is for an air blow abnormality, “E3” is for an extinction abnormality, “E4” is for a reverse flame abnormality, and the like.

  Accordingly, by making an abnormality notification using the oil temperature display panel 55 or the cooking time display panel 56, the display contents displayed on the panels 55 and 56 can be referred to so that the cooking worker or the maintenance worker can quickly And it is possible to confirm the content of the abnormality accurately. Moreover, since the oil temperature display panel 55 that displays the oil temperature Tb and the cooking time display panel 56 are used for abnormality notification during normal operation, it is necessary to install a separate display panel for abnormality notification. No cost increase can be suppressed.

(Regular inspection notification using the display panel)
The gas fryer 10 according to the embodiment includes a timer as a time measuring means for measuring the total operation time from the time of new installation. And when the total operation time which the timer timed becomes preset time, the regular inspection alerting | reporting function which alert | reports implementation of a periodic inspection is provided. The total operation time is a time during which the operation button 51 of the gas fryer is turned ON and an operation lamp (not shown) is lit. Here, in the gas fryer 10, the combustion chamber 20, the combustion gas passage 14, the exhaust duct 15, the exhaust port 16, and the like through which the high-temperature combustion gas passes are contaminated with oil smoke and dust due to long-term use. When oil smoke or dust adheres to the passage path of the combustion gas in this way, the passage resistance of the exhaust gas increases so that the draft effect is less likely to occur in the exhaust duct 15 and incomplete combustion is likely to occur.

  Therefore, in the gas fryer 10 of the embodiment, the first total operation time and the second total operation time that is longer than the first total operation time by a predetermined time are set. The first total operation time is a time that triggers notification of the execution of the periodic inspection. In addition, the second total operation time is a time that triggers the operation of the gas fryer 10 to be forcibly stopped and cannot be restarted when the periodic inspection is not performed when the first total operation time is reached. is there. That is, when a periodic inspection is performed when the total operation time of the gas fryer 10 becomes the first total operation time, the timer is cleared during the inspection operation. However, when the total operation time of the gas fryer 10 reaches the first total operation time, the periodic inspection is not performed, and the operation is continued and the total operation time reaches the second total operation time. The gas fryer 10 is forcibly stopped and cannot be restarted, and this state can be released only by a maintenance worker.

  The gas fryer 10 of the embodiment performs a predetermined display when the first total operation time has elapsed on the oil temperature display panel 55 or the cooking time display panel 56, and the second total operation time has elapsed. In this case, the display is different from the display in the case of the first total operation time. For example, when the first total operation time has elapsed, letters or numbers indicating that a periodic inspection is necessary are displayed on the oil temperature display panel 55 or the cooking time display panel 56. In addition, when the second total operation time has elapsed, an alphabetic character or a number indicating a forced stop is displayed on the oil temperature display panel 55 or the cooking time display panel 56. In the gas fryer 10 of the embodiment, “Pc” is displayed when the first total operation time has elapsed, and “EL” is displayed when the second total operation time has elapsed. The first total operation time is set to 17000 hours and the second total operation time is set to 18000 hours, but the first total operation time and the second total operation time are not limited to this.

  Therefore, in the gas fryer 10 according to the embodiment, when the total operation time becomes the first operation time, it is appropriately notified that the time when maintenance is necessary, so that the maintenance of the gas fryer 10 is performed at an appropriate timing. You can encourage them to do it. Thereby, it is suppressed to continue the operation in a state where incomplete combustion is likely to occur. Further, when the total operation time becomes the second total operation time, the operation of the gas fryer 10 is disabled, so that the continuation of the operation in a dangerous state in which incomplete combustion occurs is prevented, and the safety Is increased.

(After gas secondary pressure, combustion mode switching time and combustion mode switching temperature after setting)
In the gas fryer 10 according to the embodiment, the gas secondary pressure based on the valve opening setting of the proportional valve 35 and the combustion mode switching time Tc or the combustion mode switching temperature Td can be used as buttons on the operation panel 50. Based on this, the gas controller board 30 is configured so that the setting can be changed. Thereby, according to the installation environment and the operating environment of the gas fryer 10, the gas secondary pressure, the combustion mode switching time Tc or the combustion mode switching temperature Td suitable for the gas fryer 10 is set, so that the gas burner 13 can efficiently And safe combustion is possible.

  Further, in the embodiment, as shown in FIG. 19, the storage unit of the controller board 30 stores the type of gas used for combustion of the gas burner 13 and the type of gas burner 13 (difference in gas consumption). A preset value of the valve opening degree of the proportional valve 35 for adjusting the gas secondary pressure and a set value of the combustion mode switching time Tc or the combustion mode switching temperature Td are preset (four types in the embodiment). The setting group Gr (Gr1, Gr2, Gr3, Gr4) is stored. Accordingly, the gas secondary pressure and the combustion mode switching time Tc are selected by the flyer 10 selecting the corresponding setting group Gr (Gr1, Gr2, Gr3, Gr4) based on the button operation on the operation panel 50. Alternatively, the combustion mode switching temperature Td can be collectively set to an appropriate set value.

  In the embodiment, the proportional valve 35 as the secondary pressure adjusting means is configured to adjust the valve opening based on the current value of the current applied from the gas controller board 30. Here, even if the proportional valve 35 is of the same type, the valve opening with respect to the current value of the current applied from the gas controller board 30 varies. For this reason, even if the same current value is applied from the gas controller board 30 to the proportional valve 35, the valve opening with respect to the current value differs for each proportional valve 35, so that the secondary gas pressure varies. Therefore, in the embodiment, the current value applied from the gas controller board 30 to the proportional valve 35 is determined by directly operating the proportional valve 35 based on the measured value by the gas secondary pressure detection sensor S1. Every time it is corrected. Thus, when a current is added from the gas controller board 30 to the proportional valve 35, the target gas secondary pressure is adjusted according to the current value of the current.

  Moreover, since the proportional valve 35 has individual differences as described above, the current value applied from the gas controller board 30 is slightly different for each proportional valve 35 when adjusting to a predetermined secondary gas pressure. Therefore, in the embodiment, the set value of the gas secondary pressure and the set value of the combustion mode switching time Tc or the combustion mode switching temperature Td in the setting groups Gr1 to Gr4 are current values caused by individual differences of the proportional valve 35. It is set by taking the average value of the fluctuations. Thereby, even if there is an individual difference in the proportional valve 35, the set value of the gas secondary pressure and the set value of the combustion mode switching time Tc or the combustion mode switching temperature Td are prevented from greatly deviating. Optimal gas combustion can be obtained.

(Temperature display function)
The gas fryer 10 according to the embodiment includes an oil temperature detection sensor together with a mode for displaying a set temperature when cooking oil stored in the oil tank 12 is heated on the oil temperature display panel 55 (see FIG. 5) in the operation panel 50. 19 has a mode for displaying the actual temperature of the cooking oil detected by 19. The set temperature display mode and the actual temperature display mode can be selected by a predetermined operation using the oil temperature setting button 52 provided on the operation panel 50. Here, in the set temperature display mode, as shown in FIG. 20A, when the oil temperature Tb of the cooking oil is “oil temperature <(set temperature−15 ° C.)”, the oil temperature display panel 55 is displayed. “Lo” is displayed. In addition, when the oil temperature Tb of the cooking oil is “set temperature−15 ° C. ≦ set temperature ≦ set temperature + 15 ° C.”, “set temperature” is displayed on the oil temperature display panel 55. When the oil temperature Tb of the cooking oil is “oil temperature> (set temperature + 15 ° C.)”, “Hi” is displayed on the oil temperature display panel 55. For example, when the set temperature of cooking oil is set to 180 ° C., “Lo” is displayed when the oil temperature Tb is less than 165 ° C., and “180 ° C.” when the oil temperature Tb is 165 ° C. to 195 ° C. When the oil temperature Tb is higher than 195 ° C., “Hi” is displayed.

  In the actual temperature display mode, as shown in FIG. 20B, when the actual temperature of the cooking oil is less than 50 ° C., “Lo” is displayed on the oil temperature display panel 55. Further, when the actual temperature of the cooking oil is 50 ° C. or higher, the actual temperature is displayed on the oil temperature display panel 55.

  Therefore, by switching between the set temperature display mode and the actual temperature display mode, it is possible to check the temperature difference between the set temperature and the actual temperature, and this increases the actual temperature of the cooking oil to the set temperature. It is possible to predict the time required. In addition, since the actual temperature of the cooking oil can be confirmed by switching to the actual temperature display mode, when the cooking oil is discarded from the oil tank 12, the cooking oil in a high temperature state displayed as “Lo” in the set temperature display mode is used. It is possible to prevent work mistakes that are accidentally discarded.

(About oil temperature setting in standby mode)
When the cooking is temporarily interrupted, the gas fryer 10 of the embodiment is switched to the standby mode, and has a standby mode for keeping the cooking oil stored in the oil tank 12 at a preset standby temperature. . In the gas fryer 10 of the embodiment, a plurality of cooking oil standby temperatures in the standby mode are set, and the user can select based on a predetermined operation of the standby button 57 shown in FIG. That is, cooking using heated cooking oil includes tempura performed at a preset temperature (cooking temperature) of about 200 ° C. and frying performed at a set temperature lower than the tempura (eg, about 180 ° C.). In the example, two types of standby temperatures of 100 ° C. and 120 ° C. are set.

  Therefore, in the embodiment, since two kinds of standby temperatures can be selected, it is possible to reduce the amount of gas consumed when reheating from the standby temperature to the set temperature, or to suppress the deterioration of cooking oil. In other words, when it is desired to reduce the gas consumption during reheating, the temperature difference between the standby temperature and the set temperature is reduced by setting “standby temperature” to 120 ° C., and the gas during reheating is reduced. Consumption can be reduced, and the amount of carbon dioxide generated by gas combustion can be suppressed. On the other hand, the cooking oil has a higher acid value as the heating temperature is higher, and the deterioration is accelerated, and the deterioration is accelerated as the time for maintaining the high temperature is increased. By setting it as “low temperature standby” at 100 ° C., the oil temperature Tb during standby is lowered, and deterioration of cooking oil can be suppressed. The standby temperature is not limited to 100 ° C. or 120 ° C., and may be 100 ° C. or lower or 130 ° C. or higher. Further, the number of standby temperatures set is not limited to two, and may be three or more.

  Further, the standby temperature in the standby mode cannot be set to a predetermined temperature (150 ° C. in the embodiment) or higher. That is, as described above, the cooking oil is heated to a high temperature, so that the acid value increases and the deterioration is accelerated, and such a restriction is set to suppress the acid value. However, the temperature that cannot be set is not limited to 150 ° C., and may be 150 ° C. or less.

(Example of change)
The present invention is not limited to the configuration of the above-described embodiment, and can be modified as follows.
(1) The secondary pressure adjusting means is not limited to the proportional valve exemplified in the embodiment, and can appropriately adjust the secondary pressure of the gas supplied to the gas combustion means based on the control of the control means. Any device can be used as a substitute.
(2) The time from the start of combustion of the gas combustion means until the draft effect occurs in the exhaust duct is the structure of the gas fryer (combustion gas passage and exhaust duct flow path shape and size, etc.), the combustion capacity of the gas combustion means, etc. Therefore, the combustion mode switching time differs depending on the model.
(3) The gas temperature of the combustion gas that causes the draft effect in the exhaust duct depends on the gas fryer structure (combustion gas passage and exhaust duct passage shape and size, etc.) and the combustion ability of the gas combustion means. Since it varies from one model to another, the combustion mode switching time varies from model to model.
(4) In the embodiment, the configuration in which the gas controller substrate as the control means and the display substrate as the second control means are individually provided is exemplified, but the gas controller substrate and the display substrate are configured as a single control means. Thus, the single controller may have the function of the gas controller board and the function of the display board.

DESCRIPTION OF SYMBOLS 12 Oil tank, 13 Gas burner (gas combustion means), 25 Gas supply pipe, 15 Exhaust duct 19 Oil temperature detection sensor (oil temperature detection means), 26 1st solenoid valve (1st on-off valve)
27 Second solenoid valve (second on-off valve), 30 Gas controller board (control means)
35 Proportional valve (secondary pressure adjustment means), Gr setting group S2 Gas temperature detection sensor (gas temperature detection means), S3 Humidity detection sensor (humidity detection means)
S4 Air temperature detection sensor (air temperature detection means)
S5 Gas primary pressure detection sensor (gas primary pressure detection means), T timer (time measuring means), Tb Oil temperature Tc Combustion mode switching time, Td Combustion mode switching temperature

Claims (15)

The combustion gas after the gas supplied from the gas supply pipe (25) is combusted by the gas combustion means (13) to heat the oil tank (12) in which cooking oil is stored and heat-exchanged with the oil tank (12) In the gas fryer that raises the air in the exhaust duct (15) and discharges it to the outside,
A secondary pressure adjusting means (35) disposed in the gas supply pipe (25) for adjusting the secondary pressure of the gas supplied to the gas combustion means (13);
When the draft effect is generated by the exhaust duct (15), the secondary pressure of the gas is adjusted by the secondary pressure adjusting means (35) to a pressure suitable for normal combustion, and the gas combustion means (13) When the normal combustion mode for performing gas combustion and the draft effect by the exhaust duct (15) is not generated, the secondary pressure adjusting means is set so that the secondary gas pressure is lower than the secondary gas pressure during normal combustion. (35) to adjust the initial combustion mode for performing gas combustion of the gas combustion means (13),
From the start of combustion of the gas combustion means (13) until the draft effect is generated in the exhaust duct (15), gas combustion of the gas combustion means (13) is executed in the initial combustion mode,
A gas fryer characterized in that after the draft effect is produced in the exhaust duct (15), the gas combustion of the gas combustion means (13) is performed by switching to the normal combustion mode. Timekeeping means (T) for measuring the combustion mode switching time (Tc) from the start of combustion of the gas combustion means (13) until the draft effect occurs in the exhaust duct (15),
Control means (30) for receiving the time signal from the time measuring means (T) and controlling the secondary pressure adjusting means (35) to adjust the gas secondary pressure;
Until the time counting means (T) times the combustion mode switching time (Tc), the control means (30) performs gas combustion of the gas combustion means (13) in the initial combustion mode,
The said control means (30) performs the gas combustion of the said gas combustion means (13) in the said normal combustion mode after the said time measuring means (T) timed the said combustion mode switching time (Tc). Gas fryer. Timekeeping means (T) for measuring the combustion mode switching time (Tc) from the start of combustion of the gas combustion means (13) until the draft effect is produced in the exhaust duct (15),
Oil temperature detection means (19) for detecting the oil temperature of the cooking oil stored in the oil tank (12),
Control means (30) for receiving the oil temperature data from the oil temperature detecting means (19) and controlling the secondary pressure adjusting means (35) to adjust the gas secondary pressure;
Based on the oil temperature data measured by the oil temperature detection means (19), the control means (30) sets the combustion mode switching time (Tc),
Until the time counting means (T) times the combustion mode switching time (Tc), the control means (30) performs gas combustion of the gas combustion means (13) in the initial combustion mode,
The said control means (30) performs the gas combustion of the said gas combustion means (13) in the said normal combustion mode after the said time measuring means (T) timed the said combustion mode switching time (Tc). Gas fryer. Gas temperature detection means (S2) capable of detecting the temperature of the combustion gas passing through the exhaust duct (15),
Control means (30) for receiving the gas temperature data from the gas temperature detecting means (S2) and controlling the secondary pressure adjusting means (35) to adjust the gas secondary pressure;
Based on the gas temperature of the combustion gas measured by the gas temperature detection means (S2), the control means (30) sets a combustion mode switching temperature (Td) for determining combustion mode switching,
Until the gas temperature of the combustion gas reaches the combustion mode switching temperature (Td), the control means (30) performs gas combustion of the gas combustion means (13) in the initial combustion mode,
The control means (30) performs combustion of the gas combustion means (13) in the normal combustion mode after the gas temperature of the combustion gas becomes equal to or higher than the combustion mode switching temperature (Td). Gas fryer. Humidity detection means (S3) capable of detecting the humidity of the air supplied to the gas combustion means (13),
The gas fryer according to claim 2, wherein the control means (30) corrects the combustion mode switching time (Tc) based on humidity data measured by the humidity detection means (S3). Humidity detection means (S3) capable of detecting the humidity of the air supplied to the gas combustion means (13),
The gas fryer according to claim 4, wherein the control means (30) corrects the combustion mode switching temperature (Td) based on air humidity data measured by the humidity detection means (S3). Air temperature detection means (S4) capable of detecting the temperature of the air supplied to the gas combustion means (13),
The gas fryer according to claim 2, wherein the control means (30) corrects the combustion mode switching time (Tc) based on air temperature data measured by the air temperature detection means (S4). Air temperature detection means (S4) capable of detecting the temperature of the air supplied to the gas combustion means (13),
The gas fryer according to claim 4, wherein the control means (30) corrects the combustion mode switching temperature (Td) based on the air temperature data measured by the air temperature detection means (S4). A gas primary pressure detecting means (S5) capable of detecting a primary pressure of a gas supplied from a gas supply source through the gas supply pipe (25);
The gas fryer according to claim 2, wherein the control means (30) corrects the combustion mode switching time (Tc) based on the gas primary pressure data measured by the gas primary pressure detection means (S5). Gas primary pressure detection means (S5) capable of detecting the primary pressure of the gas supplied to the gas supply pipe (25),
The gas fryer according to claim 4, wherein the control means (30) corrects the combustion mode switching temperature (Td) based on the gas primary pressure data measured by the gas primary pressure detection means (S5).   The gas secondary pressure based on the secondary pressure adjusting means (35) and the combustion mode switching time (Tc) or combustion mode switching temperature (Td) can be changed and set at any time by the control means (30). The gas fryer as described in any one of Claims 2-10. Based on the type of gas used for combustion of the gas combustion means (13) and the type of the gas combustion means (13), the set value of the gas secondary pressure by the secondary pressure adjusting means (35), A plurality of setting groups (Gr) preset with a set value of the combustion mode switching time (Tc) or the combustion mode switching temperature (Td) is stored in the control means (30),
By selecting the setting group (Gr) by the control means (30), the gas secondary pressure and the combustion mode switching time (Tc) or the combustion mode switching temperature (Td) can be set collectively. The gas fryer according to claim 11. The secondary pressure adjusting means (35) is a proportional valve whose valve opening is adjusted based on a current value applied from the control means (30),
The gas fryer according to claim 11 or 12, wherein a current value of a current applied from the control means (30) to the secondary pressure adjusting means (35) can be adjusted by measuring the gas secondary pressure.   The set value of the gas secondary pressure and the set value of the combustion mode switching time (Tc) or the combustion mode switching temperature (Td) vary in current values caused by individual differences in the secondary pressure adjusting means (35). The gas fryer of Claim 13 set based on the average value of. A first on-off valve (26) and a second on-off valve (27) arranged in series in the middle of the gas supply pipe (25);
Control means (30) for performing on / off control of the first on-off valve (26) and the second on-off valve (27);
The control means (30)
When stopping the gas supply to the gas combustion means (13), the first on-off valve (26) and the second on-off valve (27) are closed with a predetermined time difference,
15. The closing sequence of the first on-off valve (26) and the second on-off valve (27) is executed in reverse every time the supply of gas to the gas combustion means (13) is stopped. Gas fryer as described in.

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