JP2018063059A - Gas cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas cooker which reliably stops accident fire while cooking by fire power made as small as possible in comparison with a normal occasion.SOLUTION: When an operation switch is turned on, a CPU forcibly closes an electromagnetic valve to be used for fire power adjustment in order to reduce input of a strong fire power burner (S1). By reducing the fire power further with a fire power adjustment lever from the state in which a gas flow rate decreases and the fire power becomes weak, gentle heat cooking becomes possible. During the gentle heat cooking, the CPU reads a thermoelectric force of a thermocouple every prescribed time (S3 to S5), and it is determined whether change gradient of the thermoelectric force is equal to a specified value or less (S6). By abrupt influences by wind of a ventilator or the like, flames fluctuate and the thermoelectric force may decrease. When the change gradient of the thermoelectric force is equal to the specified value or smaller (S6: YES), there is a possibility for accident fire to happen when left, so that the CPU opens the electromagnetic valve (S8) and returns the gentle heat to prescribed fire power.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a gas cooker.

  Conventionally, there has been provided a gas stove that can reduce the thermal power as much as possible as compared with the normal time (see, for example, Patent Document 1). This gas stove includes a thermal power adjustment mechanism capable of manually adjusting the thermal power of the high thermal power burner, and an electromagnetic valve for automatically adjusting the amount of gas flowing through the high thermal power burner. The thermal power adjustment mechanism operates in conjunction with manual operation of a thermal power adjustment lever provided on the front surface of the stove. For example, when the user wants to cook with simmering food such as boiled food, the user turns on an operation switch provided on the front surface of the stove. When the operation switch is turned on, the solenoid valve is forcibly closed in order to reduce the input of the high thermal power burner. By closing the solenoid valve, the gas flow rate is reduced and adjusted to a low heating power. From that state, hot fire cooking becomes possible by further reducing the thermal power with the thermal power control lever.

JP 2015-212591 A

  In the gas stove described in Patent Document 1, when the operation switch is turned on to make it weak heat power, when the heat power is further reduced by the fire power adjustment lever and the fire power is reduced to a low temperature, the fire power is very small, so the flame holding performance of the burner is weak In addition, there is a problem that misfire is easily caused because it is easily influenced by the use environment such as the gas type and the wind by the ventilation fan of the kitchen. Furthermore, in the case of boiled foods, stews, etc., since it is simmered for a long time, a loss in cooking was great if it misfired in the middle.

  An object of the present invention is to provide a gas cooking utensil that does not misfire reliably during cooking with a heating power that is as small as possible compared with that in normal times.

  A gas cooker according to claim 1 of the present invention is an adjustment means for adjusting the burner's heating power, a valve provided in the gas passage of the burner, for reducing the flow rate of gas flowing through the gas passage, and operating the valve. A gas cooking appliance comprising: a valve actuating means, wherein the heating power of the burner is weakened by the adjusting means, and the valve power is actuated by the valve actuating means; A thermocouple facing the flame hole of the burner; a monitoring means for monitoring a thermoelectromotive force output from the thermocouple; and the heat detected by the monitoring means in a state where the valve is operated by the valve operating means. Determination means for determining whether the electromotive force or a change thereof is a misfire level at which misfire is highly likely to occur, and the determination means determines that the thermoelectromotive force or a change thereof is the misfire level. If controls the driving of said valve, characterized in that the heating power of the burner by increasing the gas flow rate and a thermal restoration means for restoring to a predetermined thermal power.

  The gas cooker according to a second aspect of the present invention is the gas cooker according to the first aspect, in addition to the structure of the first aspect, the heat from the thermocouple after a predetermined time has elapsed when the thermal power recovery means returns the thermal power of the burner. A re-determination unit that determines whether or not an electromotive force exceeds a threshold; and a valve that reduces the gas flow rate by operating the valve again when the re-determination unit determines that the thermoelectromotive force exceeds the threshold. And re-actuating means.

  In addition to the configuration of the invention according to claim 1 or 2, the gas cooking appliance of the invention according to claim 3 is configured to generate sound or light when the determination means determines that the thermoelectromotive force or a change thereof is the misfire level. An informing means for informing at least one of them is provided.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the valve is an electromagnetic valve driven by a solenoid.

  The gas cooker according to a fifth aspect of the invention is characterized in that, in addition to the configuration of the invention according to any one of the first to third aspects, the valve is an electric valve driven by a motor.

  According to the gas cooking appliance of the first aspect of the invention, by monitoring the thermoelectromotive force from the thermocouple, it becomes possible to perform hot-fire cooking with the limit thermal power that does not misfire even if weak, so the cooking performance is greatly improved. it can.

  In addition to the effect of the invention according to claim 1, the gas cooking appliance of the invention according to claim 2 is brought to a stable level in which the thermoelectromotive force exceeds a threshold value after the fire power is determined to be a misfire level and the heat power returns to a predetermined heat power. When it returns to the above, the heating power can be automatically returned by operating the valve again. Therefore, it is possible to continue tofu cooking.

  In addition to the effect of the invention of claim 1 or 2, the gas cooker of the invention according to claim 3 is notified by sound or light when the misfire level is reached during hot water cooking. The operator can be informed that it has returned.

  In addition to the effect of the invention according to any one of claims 1 to 3, the gas cooking appliance of the invention according to claim 4 is an electromagnetic valve, so that the responsiveness in adjusting the gas flow rate is improved.

  In addition to the effect of the invention according to any one of claims 1 to 3, the gas cooking appliance of the invention according to claim 5 can adjust the flow rate of the gas flowing through the gas passage in a stepwise manner because the valve is an electric valve.

  In the present invention, the invention-specific matters of claims 1 to 5 may be arbitrarily combined.

1 is a perspective view of a stove 1. FIG. 3 is a perspective view of a thermal power adjustment mechanism 30. FIG. It is a figure which shows the internal structure of the needle part. FIG. 3 is a diagram showing a configuration of a thermal power control mechanism 59 provided in a gas supply pipe 27. It is a block which shows the electric constitution of the stove. It is a flowchart of a hot water control process. It is a graph which shows the time change of a thermoelectromotive force. It is a flowchart of a hot water control process (modification).

  Embodiments of the present invention will be described below. The structure of the device described below is not intended to be limited only to this, but is merely an illustrative example unless there is a specific description. The drawings are used to explain technical features that can be adopted by the present invention. In the following description, left, right, front, back, and top and bottom indicated by arrows in the figure are used.

  The structure of the stove 1 will be described with reference to FIG. The stove 1 is a table stove. The stove 1 includes a housing 2 and a top plate 3. The top plate 3 is fixed to the upper part of the housing 2 that is open. A high-calorie strong burner 5 is provided on the upper right side of the top plate 3, and a normal burner 6 is provided on the upper left side. A pan sensor 5 </ b> A is provided at the center of the upper surface of the high thermal power burner 5, and a pan sensor 6 </ b> A is provided at the center of the upper surface of the normal burner 6. The pan sensors 5 </ b> A and 6 </ b> A detect that a cooking container such as a pan or a frying pan is placed on the virtues 7 and 8. The thermistors 5B and 6B (see FIG. 5) for detecting the pan bottom temperature are stored in the respective cylinders of the pan sensors 5A and 6A.

  A large number of flame holes are provided on the side surface of the high thermal power burner 5, and an igniter 35 and a thermocouple 5C (see FIG. 5) are installed in the vicinity thereof so as to face the flame holes. The igniter 35 ignites the gas ejected from the flame hole by generating a spark discharge when driven. The thermocouple 5C is heated by a flame formed in the flame hole to generate a thermoelectromotive force. Therefore, the stove 1 can detect a misfire in the high thermal power burner 5 based on the thermoelectromotive force generated in the thermocouple 5C. Normally, a large number of flame holes are also provided on the side surface of the burner 6, and in the vicinity thereof, similarly to the high heat power burner 5, an igniter 36 and a thermocouple 6 </ b> C (see FIG. 5) are installed so as to face the flame holes. Therefore, the stove 1 can detect misfire in the normal burner 6 based on the thermoelectromotive force generated in the thermocouple 6C. A grill exhaust port 10 is provided behind the top plate 3. An exhaust port cover 11 is installed on the grill exhaust port 10 from above.

  A grill door 13 is provided at the front center of the housing 2. The grill door 13 can be pulled out in front of the housing 2 and opens and closes a grill opening on the front surface of a grill cabinet (not shown) provided in the housing 2. A grill burner (not shown) is provided in the grill cabinet, and an igniter and a thermocouple (not shown) are installed in the vicinity of the flame hole. The grill door 13 is connected to a tray base (not shown) stored in the grill cabinet. A tray, a grill net, a grill, etc. (not shown) are placed on the tray. A handle 13 </ b> A is provided at the lower front portion of the grill door 13. When the user grabs the handle 13A and pulls it forward, the pan, grill base, grill, etc. are pulled out of the grill cabinet at the same time.

  In the center of the front surface of the housing 2, ignition buttons 15, 16, heating power control levers 18, 19, an operation switch 25, and the like are provided in the right region of the grill door 13. The ignition button 15 is provided adjacent to the right side of the grill door 13 and performs an ignition / extinguishing operation of the high thermal power burner 5. The ignition button 16 is provided on the right side of the ignition button 15 and performs an ignition / extinguishing operation of a grill burner (not shown) provided in the grill cabinet. The grill burner is composed of an upper fire grill burner and a lower fire grill burner (not shown) provided respectively on the upper and lower sides of the left and right side walls in the grill cabinet.

  The thermal power adjustment lever 18 is provided above the ignition button 15 and can adjust the thermal power of the strong thermal power burner 5 by a rotating operation in a substantially horizontal direction. The thermal power adjustment lever 19 is provided above the ignition button 16, and includes an upper fire adjustment knob 19A and a lower fire adjustment knob 19B. The upper fire adjustment knob 19A can adjust the heating power of the upper fire grill burner by a rotation operation in a substantially horizontal direction. The lower-fire adjustment knob 19B can adjust the heating power of the lower-fire grill burner by a rotating operation in a substantially horizontal direction. The operation switch 25 is provided between the ignition button 15 and the heating power adjustment lever 18. The operation switch 25 is pressed in the case where it is desired to squeeze the heating power of the strong heating burner 5 further than the low heating power adjusted by the heating power adjusting lever 18 when, for example, cooking hot water such as boiled food or stew in the high heating power burner 5. Is done.

  On the other hand, in the center of the front surface of the housing 2, an ignition button 17, a thermal power adjustment lever 20, a battery case 22, and the like are provided in the left region of the grill door 13. The ignition button 17 is provided adjacent to the left side of the grill door 13 and normally performs an ignition / extinguishing operation of the burner 6. The thermal power adjustment lever 20 is provided above the ignition button 17 and can normally adjust the thermal power of the burner 6 by a rotating operation in a substantially horizontal direction. The battery case 22 is provided on the left side of the ignition button 17 and stores, for example, two dry batteries (see FIG. 5) as a power source of the stove 1.

  With reference to FIG. 2, the thermal-power adjustment mechanism 30 provided in the stove 1 is demonstrated. A thermal power adjusting mechanism 30 for adjusting ignition, extinguishing, and thermal power of various burners is provided at each position behind the panel constituting the front surface of the stove 1 and opposed to the ignition buttons 15-17. . In the present embodiment, a thermal power adjustment mechanism 30 corresponding to the high thermal power burner 5 will be described.

  The thermal power adjustment mechanism 30 includes an ignition extinguishing mechanism 100, a gas amount increasing / decreasing mechanism 200, and an operation mechanism 300. The ignition / extinguishing mechanism 100 is provided below the thermal power adjustment mechanism 30. When the ignition button 15 (see FIG. 1) is pressed, the moving member 31 provided on the front side of the ignition fire extinguishing mechanism 100 is pressed, and a gas passage (not shown) inside the valve body 32 is opened and closed, so The burner 5 is ignited / extinguished. The gas amount increasing / decreasing mechanism 200 is provided substantially at the center of the thermal power adjusting mechanism 30 and increases / decreases the amount of gas supplied to the strong thermal power burner 5 according to the operation of the operation mechanism 300 described later. The operation mechanism 300 is provided in the upper part of the thermal power adjusting mechanism 30 and operates the gas amount increasing / decreasing mechanism 200 in conjunction with the turning operation of the thermal power adjusting lever 18 by the user.

  The structure of the gas amount increasing / decreasing mechanism 200 will be described. The gas amount increasing / decreasing mechanism 200 includes a body 40. The airframe 40 includes a needle portion 41 shown in FIG. 3 inside. As shown in FIG. 3, the gas that has flowed through the gas passage of the ignition / extinguishing mechanism 100 flows into the gas flow path portion 42 of the needle portion 41. A valve sliding portion 43, which is a pipe having a diameter larger than that of the gas flow path portion 42, is connected to the downstream side of the gas flow path portion 42. The gas flow path part 42 and the valve sliding part 43 are connected by a connection part 44. In the vicinity of the upstream side of the connection portion 44 in the valve sliding portion 43, a gas discharge portion 45 that discharges gas toward a gas passage (not shown) connected to the high thermal power burner 5 is connected.

  A needle valve 47 is inserted into the valve sliding portion 43 so as to be slidable in the vertical direction. Grease is applied to the outer peripheral surface of the needle valve 47. A tip portion extending downward from the needle valve 47 is gradually narrowed. As the needle valve 47 moves up and down, the flow rate of the gas flowing from the gas flow path portion 42 toward the gas discharge portion 45 is adjusted. The distal end portion of the needle valve 47 can block the gas flow path portion 42. At the tip of the needle valve 47, valve holes 47A and 47B are provided. The valve hole 47A communicates with the valve hole 47B, and the valve hole 47B communicates with the gas discharge part 45. These valve holes 47A and 47B ensure a minimum gas flow rate in a state where the tip of the needle valve 47 closes the gas flow path portion. Thereby, the high thermal power burner 5 can be adjusted to a low thermal power.

  The upper end portion of the needle valve 47 protrudes upward from the opening at the upper end of the valve sliding portion 43. A compression spring 49 is provided between the upper end of the needle valve 47 and a bracket 50 described later. Therefore, the needle valve 47 is always urged downward. Further, a needle pin 48 is orthogonally connected to the upper end portion of the needle valve 47 and extends forward of the thermal power adjustment mechanism 30 (see FIG. 2). The needle pin 48 is rotated in the left-right direction and moved in the up-down direction by the operation of the operation mechanism 300.

  The structure of the operation mechanism 300 will be described. The operation mechanism 300 includes a bracket 50, a lever 51, and the like. The bracket 50 is provided above the body 40 and includes a cam groove 52 inside thereof. A needle pin 48 is inserted into the cam groove 52. The cam groove 52 moves the needle pin 48 in the vertical direction according to the rotation of the needle pin 48 in the horizontal direction. The rear end of the lever 51 is pivotally supported on the upper wall of the bracket 50 so as to be rotatable. The front end 51 </ b> A of the lever 51 is engaged with the heating power adjustment lever 18. The lever 51 includes a fork-like portion 54 inside a rectangular opening 53 provided at the center thereof. The fork-like portion 54 sandwiches the tip end portion of the needle pin 48 inserted through the cam groove 52, and rotates the needle pin 48 in the left-right direction as the lever 51 rotates. With these structures, when the user rotates the thermal power adjustment lever 18, the lever 51 rotates in the left-right direction, and the needle pin 48 moves up and down according to the rotation position.

  For example, when the heating power adjustment lever 18 is rotated in the right direction, the needle pin 48 moves upward by the cam groove 52. As a result, in the gas amount increasing / decreasing mechanism 200, the needle valve 47 moves upward in the valve sliding portion 43 and the gas flow rate flowing to the gas discharge portion 45 increases, so that the high thermal power burner 5 is adjusted to the high thermal power side. The On the other hand, when the heating power adjustment lever 18 is rotated leftward, the needle pin 48 moves downward by the cam groove 52. As a result, the needle valve 47 moves downward in the valve sliding portion 43 and the gas flow rate flowing through the gas discharge portion 45 decreases, so that the high thermal power burner 5 is adjusted to the low thermal power side.

  The thermal power control mechanism 59 will be described with reference to FIG. A thermal power control mechanism 59 is provided in the gas supply pipe 27 of the high thermal power burner 5 in order to improve cooking performance and safety of the stove 1. The gas supply pipe 27 is connected to a gas inlet (not shown) of the stove 1, and its downstream end is connected to the gas inlet (not shown) of the above-described heating power adjusting mechanism 30. The thermal power control mechanism 59 includes a plurality of flow paths and a plurality of electromagnetic valves. The gas supply pipe 27 includes two bypass pipes 28 and 29. The bypass pipe 28 is connected between a branch part 55 and a junction part 56 provided in the gas supply pipe 27. The bypass pipe 29 is connected between a branch part 57 and a junction part 58 provided in the bypass pipe 28.

  A safety valve 38 is provided in front of the branch portion 55 of the gas supply pipe 27. An electromagnetic valve 61 is provided between the branching portion 55 and the merging portion 56 of the gas supply pipe 27. An electromagnetic valve 62 is provided between the branch portion 57 and the junction portion 58 of the bypass pipe 28. An electromagnetic valve 63 is provided between the junction 56 and the thermal power adjustment mechanism 30. The electromagnetic valves 61 and 62 are keep solenoid valves for adjusting the gas flow rate. The electromagnetic valve 63 is a gas blocking keep solenoid valve. Therefore, the response of adjusting the gas flow rate is improved.

  In the stove 1, by opening and closing the electromagnetic valves 61 and 62, respectively, the gas flow rate flowing through the thermal power adjustment mechanism 30 can be adjusted in three stages: a first flow rate, a second flow rate, and a third flow rate. Specifically, when the solenoid valves 61 and 62 are both open, the first flow rate, and when one of the solenoid valves 61 and 62 is closed, the second flow rate and the solenoid valves 61 and 62 are both closed. Then, it becomes the third flow rate. As a result, the heating power when the heating power adjusting lever 18 (see FIG. 1) is adjusted to the maximum can be adjusted in three stages: weak heating power, medium heating power, and strong heating power. The first flow rate corresponds to low thermal power, the second flow rate corresponds to medium thermal power, and the third flow rate corresponds to high thermal power.

  In the thermal power control mechanism 59, the operation of the electromagnetic valves 61 and 62 is normally performed regardless of the user's intention, by the CPU 71 of the control circuit 70 described later, the value of the thermistors 5B and 6B for detecting the temperature of the pan bottom, or ignition. The time is controlled by the time after that. The gas input is set at about 3600 to 450 kcal / h so that the strong burner 5 does not misfire due to a change in pressure caused by a sudden change in passage pressure loss due to the solenoid valves 61 and 62. Thus, the input is set to be larger than when the thermal power is manually reduced by the thermal power adjustment lever 18. In the present embodiment, the electromagnetic valves 61 and 62 can be forcibly closed by pressing the operation switch 25 during the combustion of the high thermal power burner 5. As a result, the high thermal power burner 5 becomes weak thermal power, and by further reducing the thermal power with the thermal power adjusting lever 18 from that state, the thermal power can be reduced to an input lower than usual.

  The electrical configuration of the stove 1 will be described with reference to FIG. The stove 1 includes a control circuit 70. The control circuit 70 includes a timer, an I / O interface, etc. (not shown) in addition to the CPU 71, ROM 72, RAM 73, and nonvolatile memory 74. The timer and grill timer operate by program. The CPU 71 performs overall control of various operations of the stove 1. The ROM 72 stores a flash fire control program and the like in addition to the various programs of the stove 1. The hot water control program is for executing the hot fire control process (see FIG. 6), which will be described later. The RAM 73 temporarily stores various information. The nonvolatile memory 74 stores various parameters.

  The control circuit 70 includes a power supply circuit 81, a switch input circuit 82, a thermistor input circuit 83, a thermocouple input circuit 84, an igniter circuit 85, a sensor input circuit 86, a buzzer circuit 87, a voice synthesis circuit 88, an operation switch circuit 89, a safety valve. A circuit 90, a solenoid valve circuit 91, and the like are connected to each other. The power supply circuit 81 supplies power to various circuits using two dry batteries stored in the battery case 22 (see FIG. 1). The power supply circuit 81 includes a transistor switch (not shown). The switch input circuit 82 detects pressing of the ignition buttons 15 to 17 and inputs it to the control circuit 70. The thermistor input circuit 83 inputs the detection values from the thermistors 5B and 6B to the control circuit 70. The thermocouple input circuit 84 inputs the detection value (signal corresponding to the thermoelectromotive force) from the thermocouples 5C and 6C to the control circuit 70. The igniter circuit 85 drives the igniter 35 of the high thermal power burner 5 and the igniter 36 of the normal burner 6 based on the control signal of the CPU 71. In FIG. 7, the thermistor, thermocouple, and igniter provided in the grill burner are omitted.

  The sensor input circuit 86 inputs each detection signal of the pan sensors 5A and 6A. The buzzer circuit 87 drives the piezoelectric buzzer 77 based on a control signal from the CPU 71. The voice synthesis circuit 88 synthesizes voice of the voice guide output from the speaker 78 based on the control of the CPU 71. The operation switch circuit 89 detects the pressing of the operation switch 25 and inputs it to the control circuit 70. The safety valve circuit 46 opens and closes the safety valve 38 (see FIG. 4) based on the control of the CPU 71. The electromagnetic valve circuit 91 opens and closes the electromagnetic valves 61 to 63 (see FIG. 4) based on the control of the CPU 71. Although not shown in the figure, in the normal burner 6 and the grill burner, as in the case of the high thermal power burner 5, each gas supply pipe is provided with a safety valve and various solenoid valves, and is controlled by the safety valve circuit 46 and the solenoid valve circuit 91, respectively. Is done.

  The ignition buttons 15 to 17 are respectively connected in parallel to the switch input circuit 82 and the positive side of the dry battery stored in the battery case 22. The negative side of the dry battery is connected to the power supply circuit 81, and the switch input circuit 82 is also connected to the power supply circuit 81. When one of the ignition buttons 15 to 17 is pressed by the user, the power of the dry battery is supplied to the power circuit 81 through the switch input circuit 82, and the transistor switch of the power circuit 81 is turned on. Thereby, current flows from the power supply circuit 81 to various circuits, and the power supply of the stove 1 is turned on. The switch input circuit 82 detects which of the ignition buttons 15 to 17 has been pressed, and inputs the detection signal to the control circuit 70. Thus, the CPU 71 can determine which ignition button 15 to 17 is pressed to turn on the power.

  The hot fire control process will be described with reference to FIGS. When the user cooks with the high heat burner 5, the cooking container is placed on the virtues 7 and the ignition button 15 is pressed. When the ignition button 15 is pressed, the CPU 71 opens all the safety valves 38 and the electromagnetic valves 61 to 63 of the thermal power control mechanism 59, drives the igniter 35, and ignites the high thermal power burner 5. The flame formed in the flame hole of the strong heat burner 5 is detected by the thermocouple 5C. The user manually operates the heating power adjusting lever 18 according to the cooking condition of the food to be cooked, the progress of cooking, and the like, and adjusts the heating power of the strong heating power burner 5.

  Here, for example, there is a case where it is desired to cook the simmered food with the high thermal power burner 5. However, since the high thermal power burner 5 of the present embodiment can be adjusted in the range of about 3600 to 450 kcal / h by the thermal power adjustment mechanism 30, even if the thermal power is minimized by the thermal power control lever 18, the thermal power is used for cooking boiled food. Is too strong. In such a case, the user may press the operation switch 25. When the operation switch 25 is pressed and turned on, the CPU 71 reads the hot fire control program from the ROM 72 and executes this processing.

  First, the CPU 71 closes the electromagnetic valves 61 and 62 (S1). As a result, the flow rate of gas flowing from the gas supply pipe 27 to the thermal power adjustment mechanism 30 becomes the third flow rate, so that the thermal power of the strong thermal power burner 5 automatically becomes weak thermal power. For example, when the operation switch 25 is depressed at an input of 3600 kcal / h, the input is controlled to 800 to 500 kcal / h.

  The user presses the operation switch 25 and confirms that the high thermal power burner 5 is automatically controlled to the low thermal power, and then operates the thermal power adjustment lever 18 to finely adjust the thermal power. Can do. On the contrary, the operation switch 25 may be pressed after the heating power adjusting lever 18 is operated to adjust the heating power to the minimum. Thus, since the pressure loss due to the solenoid valves 61 and 62 is added to the pressure loss due to the normal heating power adjustment lever 18, the heating power can be reduced to a lower input than usual, and hot-fire cooking is possible. For example, in this embodiment, when the operation switch 25 is pressed and then operated with the heating power adjustment lever 18, the heating power can be adjusted in the range of 560 to 320 kcal / h. Further, since the maximum input is also reduced due to the pressure loss due to the electromagnetic valves 61 and 62, the width of the input due to the operation of the heating power adjusting lever 18 is also reduced. Thereby, the flame is stabilized.

  However, in the stove 1, since the fire power adjustment lever 18 further squeezes the fire power from the state in which the operation switch 25 is turned on to lower the fire power, the burner has low flame holding ability, and the gas type and the kitchen Since it is easily affected by the usage environment such as wind by a ventilation fan, it is in a situation where it is easy to misfire. In particular, in the case of boiled food cooking and the like, it is necessary to boil for a long time. Therefore, in this control process, in order not to cause the strong thermal power burner 5 to misfire reliably, a change in the thermoelectromotive force generated in the thermocouple 5C is monitored, and it is always determined whether or not it is at the misfire level.

  For example, as shown in FIG. 7, when the strong thermal burner 5 is ignited at the timing t0, the thermoelectromotive force generated in the thermocouple 5C rises rapidly, and then the rising curve gradually becomes gentle. When the user minimizes the thermal power with the thermal power control lever 18 at the timing t1, the flame becomes small, so that the thermoelectromotive force is rapidly decreased and thereafter maintained at the R1 level. Further, when the operation switch 25 is pressed and turned on at the timing t2, and the electromagnetic valves 61 and 62 are closed, the thermoelectromotive force further decreases, and thereafter, is maintained at the R2 level lower than the R1 level.

  Next, based on the output value of the timer, the CPU 71 determines whether or not the first predetermined time dt1 has elapsed since the operation switch 25 was turned on and the electromagnetic valves 61 and 62 were closed (S2). The first predetermined time dt1 is preferably set to a time from when the electromagnetic valves 61 and 62 are closed to when the thermoelectromotive force decreases and stabilizes at the R2 level. The CPU 71 stands by until the first predetermined time dt1 has elapsed (S2: NO). When the first predetermined time dt1 has elapsed at the timing t3 (S2: YES), the thermoelectromotive force is stable at the R2 level, so the CPU 71 reads the thermoelectromotive force generated in the thermocouple 5C (S3). . The read thermoelectromotive force is stored in the RAM 73.

  Next, the CPU 71 determines whether or not a second predetermined time dt2 has elapsed since the reading of the thermoelectromotive force based on the output value of the timer (S4). The CPU 71 stands by until the second predetermined time dt2 has elapsed (S4: NO). When the second predetermined time dt2 has passed at the timing t4 (S4: YES), the CPU 71 reads the thermoelectromotive force generated in the thermocouple 5C again (S5). Then, the CPU 71 determines whether or not the change gradient of the thermoelectromotive force per unit time is equal to or less than a specified value (negative value in the present embodiment) (S6). For example, when the unit time is set to the second predetermined time dt2, the gradient of change is calculated by (thermal electromotive force read last time−thermal electromotive force read this time) / dt2. When the change gradient is larger than the specified value (S6: NO), since there is no rapid decrease in the thermoelectromotive force, the CPU 71 returns to S4, repeatedly reads the thermoelectromotive force every second predetermined time dt2, and immediately before The change gradient is constantly monitored in real time.

  On the other hand, when the change gradient is equal to or less than the specified value (S6: YES), the change gradient is large in the negative direction, and the thermoelectromotive force is rapidly reduced. Therefore, it can be determined that the misfire level is highly likely to disappear. For example, in the W region indicated by the dotted line in FIG. 7, the fluctuation of the thermoelectromotive force is remarkable because it is affected by the disturbance due to the wind of the ventilation fan. For example, the thermoelectromotive force rapidly decreases between the timing t5 and the timing t6. When the thermoelectromotive force read at the timing t5 is k1, and the thermoelectromotive force read at the timing t6 is k2, the gradient of change is calculated as (k1−k2) / dt2. The calculated change gradient is below the specified value. If this state is left unattended, there is a high possibility of misfire.

  Therefore, the CPU 71 drives the piezoelectric buzzer 77 (see FIG. 5) at the timing t6 to notify the buzzer (S7), and opens both the electromagnetic valves 61 and 62 (S8). As a result, the flow rate of the gas flowing from the gas supply pipe 27 to the heating power adjustment mechanism 30 increases to the first flow rate, and the pressure loss due to the electromagnetic valves 61 and 62 is eliminated, so that the flame becomes large. As a result, the thermal power is restored to its original state and stabilized, so that misfire can be reliably prevented. Moreover, since it notifies with a buzzer, since there is a high possibility that the high thermal power burner 5 will misfire, it is possible to notify the user that the hot fire is forcibly returned to the original thermal power. As a result, it is possible to prevent the user from returning to the original heating power from the hot fire without being noticed by the user. As described above, when the misfire level is determined, for example, when a small flame fluctuates due to the wind of a ventilation fan, the change gradient of the thermoelectromotive force at that time is greatly inclined in the negative direction. By utilizing this property, it is possible to quickly detect a state in which misfire is likely to occur.

  After the flame is stabilized, the CPU 71 determines whether or not the third predetermined time dt3 has elapsed from the timing t6 when the electromagnetic valves 61 and 62 are opened in order to resume the hot-fire cooking (S9). The CPU 71 stands by until the third predetermined time dt3 has elapsed (S9: NO). When the third predetermined time dt3 has passed at the timing t7 (S9: YES), the CPU 71 reads the thermoelectromotive force generated in the thermocouple 5C again (S10). CPU71 judges whether the read thermoelectromotive force exceeded the threshold value (S11). When the thermoelectromotive force is below the threshold (S11: NO), the thermoelectromotive force is weak and the flame is not yet stable. If the firepower is further reduced in this state, there is a possibility of misfire again. Therefore, the CPU 71 returns to S10 and continues monitoring the thermoelectromotive force until the thermoelectromotive force exceeds the threshold value.

  On the other hand, as shown in FIG. 7, when the thermoelectromotive force k3 read at the timing t7 exceeds the threshold (S11: YES), the flame is in a stable state. Therefore, the CPU 71 returns to S1 and closes the solenoid valves 61 and 62 again, whereby the high thermal power burner 5 is adjusted again from the high thermal power to the hot fire, and the hot fire cooking is resumed. Thereby, since the user can continue to perform hot water cooking without misfiring in the middle, it is possible to perform heat cooking such as simmering for a long time.

  In some cases, it is desired to return the heating power adjustment of the strong heating burner 5 to the normal input range. In that case, the user may press the operation switch 25 again to turn it off. When the operation switch 25 is turned off, the CPU 71 forcibly ends the hot water control process and opens the electromagnetic valves 61 and 62. As a result, the gas flow rate flowing from the gas supply pipe 27 to the thermal power adjusting mechanism 30 becomes the first flow rate, so that the thermal power of the strong thermal power burner 5 automatically returns to the strong thermal power. When the user presses the ignition button 15 again after the cooking, the electromagnetic valves 61 to 63 are closed, the high heat burner 5 is extinguished, and the safety valve 38 is finally closed to shut off the gas. .

  As described above, the stove 1 of the present embodiment includes the thermal power adjustment mechanism 30 that can manually adjust the thermal power of the high thermal power burner 5 and the electromagnetic valve 61 for automatically adjusting the flow rate of gas flowing through the high thermal power burner 5. , 62. The thermal power adjustment mechanism 30 operates in conjunction with manual operation of the thermal power adjustment lever 18. For example, when the user wants to make the heating power as small as possible in order to cook boiled food or the like, the operation switch 25 provided on the front surface of the stove 1 is turned on. When the operation switch 25 is turned on, the CPU 71 of the stove 1 forcibly closes the electromagnetic valves 61 and 62 in order to reduce the input of the high heat burner 5. By closing the solenoid valves 61 and 62, the thermal power can be further reduced by the thermal power adjusting lever 18 from the state where the gas flow rate is reduced.

  In a state where the operation switch 25 is turned on and the electromagnetic valves 61 and 62 are forcibly closed, the stove 1 has a misfire level at which the gradient of the thermoelectromotive force read by the thermocouple 5C has a high possibility of misfire. It is determined whether or not. When it determines with a misfire level, the stove 1 will open the solenoid valves 61 and 62, and will raise the gas flow rate, and will reset the thermal power of the strong thermal power burner 5 to a strong thermal power. In this manner, by monitoring the thermoelectromotive force generated in the thermocouple 5C, it is possible to perform hot-fire cooking with the limit thermal power that does not cause misfire, so that the cooking performance can be greatly improved.

  In the said embodiment, when it returns to the original thermal power from a torch, the thermoelectromotive force of the thermocouple 5C is read after predetermined time progress, and it is determined whether it exceeded the threshold value. When it returns to the stable level exceeding a threshold value, a thermal power can be returned to melting by closing the solenoid valves 61 and 62 again. Thereby, the stove 1 can continue performing hot-fire cooking.

  In the above description, the thermal power adjusting lever 18 and the thermal power adjusting mechanism 30 are examples of the “adjusting means” of the present invention. The electromagnetic valves 61 and 62 are examples of the “valve” of the present invention. The CPU 71 that executes the process S1 of the hot water control process is an example of the “valve actuating means” in the present invention. The CPU 71 that executes the processes of S3 to S5 is an example of the “monitoring unit” in the present invention. The CPU 71 that executes the process of S6 is an example of the “determination unit” of the present invention. The CPU 71 that executes the process of S8 is an example of the “thermal power recovery means” in the present invention. The CPU 71 that executes the processes of S10 and S11 is an example of the “re-determination means” in the present invention. S11: CPU71 which performs the process of S1 based on determination of NO is an example of the "valve reactivation means" of the present invention. The CPU 71 that executes the process of S7 is an example of the “notification unit” in the present invention.

  In addition, this invention is not limited to the said embodiment, A various change is possible. For example, in the above-described embodiment, in the state where the operation switch 25 and the thermal power control lever 18 are turned off, the change gradient of the thermoelectromotive force generated in the thermocouple 5C is monitored to determine whether or not it is a misfire level. However, it may be determined by a method other than this, for example, the misfire level may be determined based on whether or not the thermoelectromotive force has decreased to a predetermined threshold value or less.

  FIG. 8 shows a modification of the fire control process shown in FIG. Between S3 and S7, instead of the processes of S4 to S6 for determining the misfire level of FIG. 6, the process of S100 is executed. In the process of S100, the CPU 71 determines whether or not the thermoelectromotive force generated in the thermocouple 5C is equal to or less than the first threshold value. If the thermoelectromotive force exceeds the first threshold (S100: NO), the flame is stable, so the CPU 71 returns to S3 and continues to monitor the thermoelectromotive force (S3, S100). On the other hand, when the thermoelectromotive force is less than or equal to the first threshold (S100: NO), since the flame is small and the possibility of misfire due to swaying with the wind or the like is high, the CPU 71 determines the misfire level and notifies the buzzer. Then, the solenoid valves 61 and 62 are closed (S7, S8). The misfire level may be determined by such a method. In the present modification, the first threshold value is set in the process of S100, so the threshold value used in the determination process of S11 is the second threshold value. The second threshold value may be the same as the first threshold value, or may be set to a value larger than the first threshold value. In the latter case, it is determined that the misfire level has been reached, and the flame is restored from strong heat to strong heat.After confirming that the flame is sufficiently stable, the fire power can be reduced again to make it hot. It can be carried out.

  Moreover, in the said embodiment, when it determines with the change gradient of a thermoelectromotive force being a misfire level, a buzzer alerting | reporting (S7) is carried out, However Sounds other than a buzzer may be sufficient, for example, a message etc. may be output with an audio | voice. Further, instead of the sound, a light emitting unit such as an LED or a lamp may be provided in the housing 2 to be turned on or blinked. Moreover, you may make it alert | report by both the sound and the light by a light emission part. Further, the buzzer notification may be omitted.

  Moreover, although it is the timing which alert | reports with a buzzer, you may alert | report simultaneously before opening the solenoid valves 61 and 62, and may close | release before the solenoid valves 61 and 62 are closed. In the latter case, after the buzzer is notified, the solenoid valves 61 and 62 are closed and the thermal power returns to the predetermined thermal power, so that it can be known in advance that the thermal power returns to the predetermined thermal power. Therefore, safety can be improved.

  Moreover, in the said embodiment, when it is judged that the change gradient of a thermoelectromotive force is the misfire level below a regulation value (S6: YES), although both the solenoid valves 61 and 62 are open | released (S8), either You may make it open only one side.

  Moreover, in the hot water control process of the said embodiment, you may abbreviate | omit the process of S9-S11. In that case, for example, the operation switch 25 may be pressed again to return to S1 and repeat the process.

  Moreover, although the stove 1 of the said embodiment is a table stove, the built-in stove installed in the counter of a kitchen may be sufficient.

  Moreover, although the operation switch 25 corresponding to the high thermal power burner 5 has been described in the above embodiment, for example, an operation switch corresponding to the normal burner 6 or the grill burner may be provided.

  In the above embodiment, as shown in FIG. 4, the gas supply pipe 27 is provided with two bypass pipes 28 and 29 and two electromagnetic valves 61 and 62, so that the heating power is switched in three stages. However, the number of bypass pipes and the number of solenoid valves may be reduced (for example, one bypass pipe and one solenoid valve) to switch the thermal power in two stages. Further, it may be possible to adjust the heating power in more stages by further increasing the number of bypass pipes and the number of solenoid valves.

  In the above-described embodiment, the electromagnetic valves 61 and 62 are keep solenoid valves that open and close the flow path. However, for example, the solenoid valves 61 and 62 may be electric valves that can continuously increase or decrease the flow path area by being driven by a motor. Good. As an example of the electric valve, for example, an opening adjustment valve for a heating cooker disclosed in Japanese Patent Application No. 2013-167778 filed by the present applicant can be applied. In this case, since the flow rate of the gas flowing through the gas supply pipe 27 can be adjusted in multiple stages with a single motor-operated valve, the cost for the valve can be saved. Further, since the flow channel area can be continuously increased or decreased, the gas flow rate can be freely adjusted.

  In the above embodiment, when the operation switch 25 is turned on, both the electromagnetic valves 61 and 62 are closed, but either one may be closed.

  In the above-described embodiment, the operation switch 25 is normally off, and the solenoid valves 61 and 62 are closed when the switch is turned on and opened when the switch is turned off. If is turned on, the solenoid valves 61 and 62 may be closed when turned off and opened when turned on.

  In the above embodiment, when the user rotates the thermal power adjusting levers 18 to 20 to the right, the thermal power of the corresponding burners is adjusted to the high thermal power side, and to the left, the low thermal power side is adjusted. However, the relationship between the direction of rotation of the thermal power adjusting levers 18 to 20 and the strength of the thermal power may be reversed.

1 Stove 5A Strong thermal burner 5C Thermocouple 18 Thermal control lever 25 Operation switch 30 Thermal power adjustment mechanism 59 Thermal power control mechanism 61, 62 Solenoid valve 71 CPU

Claims (5)

Adjusting means for adjusting the burner's heating power;
A valve provided in the gas passage of the burner for reducing the flow rate of gas flowing through the gas passage;
Valve actuating means for actuating the valve,
In the gas cooking utensil capable of adjusting the burner's heating power more weakly by reducing the heating power of the burner by the adjusting means and operating the valve by the valve operating means,
A thermocouple facing the flame hole of the burner;
Monitoring means for monitoring the thermoelectromotive force output from the thermocouple;
In the state in which the valve is operated by the valve operating means, the determining means for determining whether the thermoelectromotive force detected by the monitoring means or a change thereof is a misfire level at which misfire is highly likely to occur;
When the determination means determines that the thermoelectromotive force or a change in the misfire level is the misfire level, the power of the burner is returned to a predetermined heat by controlling the drive of the valve and increasing the gas flow rate. A gas cooker characterized by comprising: When the thermal power recovery means returns the thermal power of the burner, a re-determination means for determining whether or not the thermoelectromotive force from the thermocouple exceeds a threshold after a predetermined time has elapsed;
2. The valve re-actuating means for reactivating the valve and decreasing the gas flow rate when the re-determination means determines that the thermoelectromotive force exceeds the threshold value. The gas cooker described. 3. The gas according to claim 1, further comprising a notification unit that notifies at least one of sound and light when the determination unit determines that the thermoelectromotive force or a change thereof is the misfire level. kitchenware. The gas cooker according to any one of claims 1 to 3, wherein the valve is an electromagnetic valve driven by a solenoid. The gas cooker according to any one of claims 1 to 3, wherein the valve is an electric valve driven by a motor.

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