JP2013204846A - Gas combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas combustion device preventing an ignition failure, and smoothly carrying out the ignition processing of a gas burner while securing safety.SOLUTION: An ignition gas amount for forming large combustion flame in a gas burner 10 is supplied a predetermined time from ignition starting, a gas supply amount to the gas burner 10 is temporarily reduced to a fixed gas amount throttled more than the ignition gas amount, then, the gas supply amount to the gas burner is increased more than a combustion gas amount larger than the fixed gas amount, and it is determined whether or not a thermoelectromotive force of a thermocouple 21 may reach an ignition detection level.

Description

  The present invention relates to a gas combustion apparatus. In particular, the present invention relates to a gas burner ignition process.

  In general, a gas combustion apparatus such as a gas cooker is provided in the vicinity of a gas burner to be supplied with fuel gas and ignited by an ignition electrode and burned, and a combustion state of the gas burner. A thermocouple that is beaten and outputs a thermoelectromotive force. In this type of gas combustion device, in order to prevent combustion failure due to misfire during combustion operation, when the thermoelectromotive force of the thermocouple decreases, the supply of fuel gas to the gas burner is stopped and the user is notified of the abnormality. . In addition, even during ignition processing, in order to prevent gas leakage due to poor ignition, supply of fuel gas to the gas burner will be performed if the thermoelectromotive force of the thermocouple does not rise to a predetermined ignition detection level within a certain time from the start of ignition. The ignition process is forcibly terminated (Patent Document 1).

Japanese Patent Laid-Open No. 9-222226

  By the way, the supply amount of gas to the gas burner at the start of ignition is usually set to a gas supply amount at which a large flame of combustion is formed in order to ensure ignitability. However, with such a gas supply amount that forms a combustion flame of such a large fire, if air has entered the gas burner or the gas flow path of the supply pipe, a combustion flame that does not form a combustion flame at some of the flame outlets. In some cases, slipping or lifting may occur. When such an abnormal combustion state occurs in a flame mouth that forms a combustion flame that strikes a thermocouple, the thermocouple is properly burned by the combustion flame even if the combustion flame is normally fixed in other flame mouths. Therefore, it is difficult for the thermoelectromotive force to exceed the ignition detection level within a certain time. As a result, although the gas burner is ignited, it may be determined that the ignition is poor and the gas burner may be extinguished. Therefore, the user has to repeat the ignition process, and there is a problem that the usability is bad.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a gas combustion apparatus that prevents ignition failure and smoothly performs ignition processing of a gas burner while ensuring safety. There is to do.

The present invention comprises a gas burner that is supplied with fuel gas and is ignited and burned by ignition means;
A gas combustion apparatus comprising a control unit that performs ignition by the ignition means while adjusting a gas supply amount of the fuel gas to the gas burner,
The control unit ignites the gas burner by the ignition means while supplying fuel gas at a predetermined ignition gas amount to the gas burner at the start of ignition.
After a predetermined time has elapsed from the start of ignition, the gas supply amount to the gas burner is temporarily reduced to a fixing gas amount that is narrower than the ignition gas amount, and then the gas supply amount to the gas burner is changed to the fixing gas amount. It is a gas combustion device that increases the amount of combustion gas to be larger than the amount of gas.

  According to the gas combustion apparatus, when a predetermined time has elapsed from the start of ignition, the gas supply amount to the gas burner is temporarily reduced to the fixing gas amount that is narrower than the ignition gas amount. For example, the size of the combustion flame formed at the flame outlet of the gas burner when the fixing gas amount is supplied is smaller than that when the ignition gas amount is supplied. Therefore, even if the combustion flame is lifted in a state where the amount of ignition gas that forms a large combustion flame is supplied, the small combustion flame tends to be fixed in the normal shape in the normal shape due to the decrease in the gas supply amount. Become. In addition, since the gas flow rate is reduced by reducing the gas supply amount, if there is no combustion flame formed in some of the flame ports, it becomes easier to transfer from other flame ports where the combustion flame is formed, The combustion flame can be fixed to the flame outlet in a state where there is no penetration.

  Since the gas supply amount is temporarily reduced to a fixing gas amount that forms a small combustion flame, and then increased to a combustion gas amount, the combustion flame is fixed with the normal combustion flame fixed to the flame outlet. Can be bigger. As a result, since the thermocouple is properly burned by the combustion flame, the thermoelectromotive force of the thermocouple becomes higher than the ignition detection level at an early stage, and even if the thermocouple is not properly burned by the combustion flame with the amount of ignition gas , Can prevent ignition detection errors.

In the gas combustion apparatus, preferably,
A thermocouple is provided in the vicinity of the gas burner, and outputs a thermoelectromotive force according to a heat receiving temperature.
The control unit is configured to fix the gas supply amount to the gas burner smaller than the ignition gas amount when the thermoelectromotive force of the thermocouple does not reach the ignition detection level before a predetermined time elapses from the ignition start. Reduce to gas volume.

  According to the above gas combustion apparatus, the gas supply amount is reduced only when the fuel gas is supplied to the gas burner in the amount of ignition gas and combustion abnormality occurs and the thermocouple is not properly burned by the combustion flame. Because the combustion flame is reduced, the user feels uncomfortable. On the other hand, when ignition is started and the fuel gas is supplied to the gas burner in the amount of ignition gas, if the thermoelectromotive force of the thermocouple becomes equal to or higher than the ignition detection level before the predetermined time elapses, the gas supply amount is reduced. Therefore, there is no inconvenience when the combustion flame is normally formed from the start of ignition.

In the gas combustion apparatus, preferably,
The control unit stops the supply of the fuel gas to the gas burner when the thermoelectromotive force of the thermocouple does not reach the ignition detection level when the fuel gas is supplied to the gas burner with the combustion gas amount. To report an ignition error.

  Even if the gas burner is burned with a larger amount of combustion gas than the amount of fixing gas after the operation of fixing the combustion flame to the flame mouth by temporarily reducing the gas supply amount to the amount of fixing gas, the thermoelectric When the thermoelectric power of the pair is less than the ignition detection level, it is highly possible that the combustion flame is not normally formed in the flame outlet, so it is possible to stop the combustion abnormality early by notifying the ignition error. .

In the gas combustion apparatus, preferably,
The control unit adjusts the gas supply amount so that the combustion gas amount is substantially the same as the ignition gas amount.

  According to the gas combustion device, if the gas burner is ignited, the combustion flame is temporarily reduced by the amount of fixing gas, and a combustion flame of the same level as that at the start of ignition is immediately formed. There is little discomfort.

  As described above, according to the present invention, the ignition process of the gas burner can be performed smoothly while ensuring safety and preventing ignition failure.

FIG. 1 is a schematic configuration diagram of a gas combustion apparatus according to an embodiment of the present invention. FIG. 2 is a gas circuit diagram of the gas combustion apparatus according to the embodiment of the present invention. FIG. 3 is a control flowchart showing the operation of the ignition process of the gas combustion apparatus according to the embodiment of the present invention.

  Hereinafter, the case where the gas combustion apparatus of the present invention is applied to a gas cooker will be described with reference to the drawings.

  As shown in FIG. 1, the gas cooker according to the embodiment of the present invention is provided with two gas stoves 1 and 3 on the upper surface of the gas table, and in front of the front side, inside the gas table. An open / close door is provided for putting food into and out of the provided grill 5. Further, on the left and right of the open / close door, in addition to the fire extinguishing buttons 11, 31, 51 and the thermal power adjustment knobs 12, 32, 52 having a push push mechanism (not shown) for operating the gas stoves 1, 3 and the grill 5, A buzzer 9 for notifying abnormality is provided. Moreover, the point-extinguishing buttons 11, 31, and 51 are connected to micro switches 13, 33, and 53 (see FIG. 2) that are turned on and off by pressing.

  FIG. 2 is a gas circuit diagram, and supply pipes 14, 34 and 54 branched from gas pipes for supplying fuel gas are connected to the gas burners 10 and 30 for the gas stoves 1 and 3 and the gas burner 50 for the grill 5, respectively. Has been. In addition, since the ignition processing method of this Embodiment is applied to the gas stoves 1 and 3, the structure of the gas stoves 1 and 3 is mainly demonstrated concretely below.

  The supply pipes 14 and 34 connected to the gas burners 10 and 30 for the gas stoves 1 and 3 include main valves 15 and 35 that are opened and closed by pressing the fire extinguishing buttons 11 and 31, and when the ignition to the gas burners 10 and 30 is started. Safety valves 16 and 36 composed of electromagnetic valves that are opened, and flow rate control valves 17 and 37 composed of electromagnetic valves that adjust the amount of fuel gas supplied to the gas burners 10 and 30 are arranged. The supply pipes 14 and 34 are formed with bypass passages 18 and 38 that branch before and after the flow control valves 17 and 37 and are parallel to the flow control valves 17 and 37. 19 and 39 are provided. Therefore, when the flow rate control valves 17 and 37 are closed, the fuel gas is supplied to the gas burners 10 and 30 only through the bypass passages 18 and 38, so that the gas supply amount decreases. On the other hand, when the flow control valves 17 and 37 are opened, the gas supply amount increases. As described above, the safety valves 16 and 36 and the flow rate control valves 17 and 37 are electromagnetic valves, and their opening degrees are adjusted according to a signal from the control unit 7 described later.

  In the vicinity of the gas burners 10 and 30, there are ignition electrodes 20 and 40 that perform spark discharge, and thermocouples 21 and 41 that are burned by the combustion flame and output thermoelectromotive force, and a flame opening (not shown) of the gas burners 10 and 30. It is arranged to face. The ignition electrodes 20 and 40 are subjected to spark discharge when the control unit 7 controls the energization of the sparker SP, whereby the gas burners 10 and 30 are ignited. These ignition electrodes 20 and 40 and the sparker SP correspond to ignition means.

  Although not shown, the control unit 7 includes a microcomputer, and opens and closes a sparker control unit for controlling energization to the sparker SP and safety valves 16 and 36 in accordance with the operation of the fire extinguishing buttons 11 and 31 as functional constituent means. Safety valve drive unit, control valve drive unit for opening and closing the flow rate control valves 17, 37, ignition detection unit for determining whether the thermoelectromotive force of the thermocouples 21, 41 is equal to or higher than a predetermined ignition detection level, and performing predetermined notification In addition to a buzzer drive unit for energizing and driving the buzzer 9 according to instructions from the microcomputer, a timer and a combustion operation control unit for performing a predetermined combustion operation are provided. Safety valves 16 and 36, flow rate control valves 17 and 37, ignition electrodes 20, 40, thermocouples 21 and 41, and microswitches 13 and 33 that are turned on and off in conjunction with the operation of the fire extinguishing buttons 11 and 31, and the like.

  Next, the operation control of the ignition process in the gas cooker of the present embodiment will be specifically described with reference to the control flowchart of FIG. In addition, since the operation control of the ignition process of the gas stoves 1 and 3 is the same, the gas stove 1 will be described below as an example.

  When the user performs an ignition operation by pressing the fire extinguishing button 11 (ST1), the main valve 15 is opened and the micro switch 13 is turned on to start energization from the power source. When the supply of power to the microcomputer is started, the control unit 7 starts a timer, starts supplying power to the sparker SP, and sends a signal so that an adsorption current flows to the safety valve 16 and the flow rate control valve 17. These are held open. As a result, the amount of ignition gas that becomes a combustion flame of a large fire is supplied to the gas burner 10, the ignition electrode 20 is sparked, and ignition of the gas burner 10 is started.

  Next, whether or not the thermocouple 21 is burned by the combustion flame of the gas burner 10 and the thermoelectromotive force output from the thermocouple 21 is equal to or higher than a predetermined ignition detection level (for example, 3.5 V ± 0.5 mV). Is started (ST2).

  If the thermoelectromotive force of the thermocouple 21 becomes equal to or higher than the ignition detection level within a predetermined elapsed time (for example, 7 seconds) from the start of ignition of the gas burner 10 (Yes in ST2, No in ST3), the control unit 7 Then, it is determined that the ignition of the gas burner 10 is completed, the power supply to the sparker SP is stopped, and the combustion operation is continued (ST9 to ST10).

  On the other hand, even if fuel gas is supplied to the gas burner 10 in the amount of ignition gas, the thermoelectromotive force of the thermocouple 21 is below the ignition detection level until a predetermined elapsed time has elapsed from the start of ignition (No in ST2). The control unit 7 stops the adsorption current to the flow rate control valve 17 and closes the flow rate control valve 17 (ST4). As a result, the gas supply amount is reduced, and the fuel gas is supplied to the gas burner 10 only through the orifice 19 of the bypass 18, so that the fixing gas amount serving as a small flame combustion flame is supplied to the gas burner 10.

  Then, the fuel gas is temporarily supplied to the gas burner 10 in a fixing gas amount for a short time (in this embodiment, about 1 second) from the start of ignition until a predetermined elapsed time (for example, 8 seconds) elapses. Thereafter (ST5), the adsorption current is again applied to the flow rate control valve 17, and the flow rate control valve 17 is opened (ST6). As a result, the gas supply amount is increased to a combustion gas amount (in this embodiment, the same gas amount as the ignition gas amount) than the fixing gas amount.

  Next, it is determined whether or not the thermoelectromotive force of the thermocouple 21 is equal to or higher than the ignition detection level (ST7 to ST8), and the heat of the thermocouple 21 is within a predetermined elapsed time (for example, 10 seconds) from the start of ignition. When the electromotive force becomes equal to or higher than the ignition detection level (Yes in ST7, No in ST8), the control unit 7 determines that the ignition of the gas burner 10 is completed, stops the power supply to the sparker SP, and performs the combustion operation. Continue (ST9 to ST10).

  On the other hand, if the thermoelectromotive force of the thermocouple 21 is less than the ignition detection level even after a predetermined elapsed time has elapsed after the gas supply amount is changed to the combustion gas amount (No in ST7, Yes in ST8) The control unit 7 stops power supply to the sparker SP, stops the adsorption current to the safety valve 16 and closes it, and notifies the ignition error from the buzzer 9 (ST11).

  As described above, according to the gas combustion apparatus of the present embodiment, the fuel gas is supplied to the gas burner in the amount of ignition gas until a predetermined time has elapsed from the start of ignition, and the thermoelectromotive force exceeding the ignition detection level during that period. Since the combustion operation is continued without reducing the gas supply amount, the convenience of the user is good.

  On the other hand, when the fuel gas is supplied to the gas burner in the amount of ignition gas, and there is a combustion abnormality in which the thermocouple is not properly burned by the combustion flame, the gas supply amount is temporarily changed to the fixing gas. If the gas burner is ignited, a small combustion flame is formed at the flame outlet. Therefore, even if the combustion flame is lifted in a state where an ignition gas amount is formed in which a large combustion flame is formed, the small combustion flame has a normal shape by reducing the gas supply amount to the fixing gas amount. It becomes easy to settle in the flame mouth. Furthermore, since the gas flow rate is reduced by reducing the gas supply amount, if there is no combustion flame formed in some of the flame ports, it becomes easier to transfer from other flame ports where the combustion flame is formed, The combustion flame can be fixed to the flame outlet in a state where there is no penetration.

  Since the gas supply amount is temporarily reduced to a fixing gas amount that forms a small combustion flame, and then increased to a combustion gas amount, the combustion flame is fixed with the normal combustion flame fixed to the flame outlet. Can be bigger. This makes it easier for the thermocouple to be appropriately burned by the combustion flame, so that the thermocouple's thermoelectromotive force has exceeded the ignition detection level at an early stage, and the thermocouple has not been properly burned by the combustion flame with the amount of ignition gas. Even in this case, an ignition detection error can be prevented.

  It should be noted that when the fuel gas is supplied to the gas burner in the amount of ignition gas, the combustion flame is reduced by reducing the gas supply amount only when combustion abnormality occurs and the thermocouple is not properly burned by the combustion flame. Therefore, there is little discomfort for the user.

  On the other hand, if the thermoelectromotive force of the thermocouple does not increase even after the gas supply amount is increased to the combustion gas amount, the combustion flame will not disappear even if the gas supply amount is temporarily reduced to eliminate the combustion abnormality. Since there is a high possibility that the flame mouth is not normally formed, it is possible to stop the combustion abnormality at an early stage by notifying the ignition error.

  In the above embodiment, the case where the present invention is applied to the ignition process of the gas burner for the gas stove has been described. However, the present invention may be applied to a grill gas burner. Moreover, you may apply to gas combustion apparatuses, such as a gas hot air heater and a gas water heater, which use gas burners other than a gas cooker.

10, 30 Gas burner 20, 40 Ignition electrode 21, 41 Thermocouple 7 Control unit SP Sparker

Claims (4)

A gas burner supplied with fuel gas and ignited and burned by ignition means;
A gas combustion apparatus comprising a control unit that performs ignition by the ignition means while adjusting a gas supply amount of the fuel gas to the gas burner,
The control unit ignites the gas burner by the ignition means while supplying fuel gas at a predetermined ignition gas amount to the gas burner at the start of ignition.
After a predetermined time has elapsed from the start of ignition, the gas supply amount to the gas burner is temporarily reduced to a fixing gas amount that is narrower than the ignition gas amount, and then the gas supply amount to the gas burner is changed to the fixing gas amount. A gas combustion device that increases the amount of combustion gas greater than the amount of gas. The gas combustion apparatus according to claim 1, wherein
A thermocouple is provided in the vicinity of the gas burner, and outputs a thermoelectromotive force according to a heat receiving temperature.
The control unit is configured to fix the gas supply amount to the gas burner smaller than the ignition gas amount when the thermoelectromotive force of the thermocouple does not reach the ignition detection level before a predetermined time elapses from the ignition start. Gas combustion device that reduces the amount of gas. The gas combustion apparatus according to claim 2,
The control unit stops the supply of the fuel gas to the gas burner when the thermoelectromotive force of the thermocouple does not reach the ignition detection level when the fuel gas is supplied to the gas burner with the combustion gas amount. A gas combustion device that reports an ignition error. The gas combustion apparatus according to any one of claims 1 to 3,
The control unit is a gas combustion apparatus that adjusts a gas supply amount so that the amount of combustion gas is substantially equal to the amount of ignition gas.

Images