KR930006166B1 - Control method for combustor - Google Patents

Abstract

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Description

Combustor Control Method

1 is a schematic diagram of a gas water heater showing an embodiment of the present invention.

2 is a perspective view showing a combustor of the present embodiment.

3 is a functional block diagram showing a functional configuration of a control device.

4 is a time chart for explaining the operation of this embodiment.

* Explanation of symbols for main parts of the drawings

10: combustor 15: spark electrode (ignition means)

30: fuel supply pipe (fuel supply path) 36: original solenoid valve

37: regulator proportional valve 40: controller

The present invention relates to a combustor control method for safe ignition at burner ignition.

For example, in the gas water heater, a proportional solenoid valve that controls the fuel supply amount according to the energizing current is installed in the fuel supply path to the burner so as to obtain the combustion amount according to the required heating amount.

On the other hand, in order to obtain a large heating capacity, a burner having a large combustion amount is installed or several burners are installed.

At the time of ignition, so-called slow ignition was performed in which the fuel supply amount to the burner was limited by a proportional control valve in order to suppress the ignition pressure of the burner.

In this slow ignition, in order to ensure fuel restriction by the proportional control valve, the proportional control valve is energized after the energizing operation to the solenoid valve provided upstream of the proportional control valve.

That is, when the fuel pressure is applied to the proportional control valve and then energized with the proportional control valve, when the proportional control valve is energized, it is prevented from opening beyond the opening degree at the slow ignition.

When the energization to the proportional control valve is performed after the solenoid valve as described above, since the fuel pressure is reliably applied to the proportional control valve, it becomes difficult to open the proportional control valve and does not open more than necessary, for example, for a long time. When the proportional control valve itself is difficult to open, such as when no equipment is used, the valve body of the proportional control valve becomes more difficult to open due to the fuel pressure. Therefore, it is difficult to obtain sufficient driving force to the valve body through the normal slow ignition current. The sieve does not displace.

In such a case, sufficient control force cannot be obtained with respect to the supplied fuel, and the proportional control valve cannot fully suppress the fuel supply amount, resulting in gas bleeding.

As a result, a large amount of gas is supplied to the burner, which increases the ignition pressure, which may cause a dangerous case.

An object of the present invention is to improve the safety at the time of ignition in the control device of the combustor in which the fuel supply amount at the time of ignition is limited by the proportional control valve.

The present invention is to install a solenoid valve, which is an electromagnetic shutoff valve, and a regulator proportional valve, which is an electromagnetic proportional valve, in the fuel supply path for supplying fuel to a burner. The combustor control apparatus which energizes said open / close valve and the regulator proportional valve in order, WHEREIN: It is related with the combustor control method characterized by first energizing the said regulator proportional valve before energization with the said original solenoid valve.

In the present invention, the regulator proportional valve is energized once before the original solenoid valve is energized.

At this time, since the fuel pressure is not applied to the regulator proportional valve, the regulator proportional valve can be easily opened.

Once the regulator proportional valve is opened, the original solenoid valve is energized by opening the solenoid valve at the same time as the operation of the ignition means, or behind the operation of the ignition means, and the fuel pressure is applied to the regulator proportional valve. The regulator proportional valve is then energized.

Therefore, since the regulator proportional valve opens in resistance to the pressure of the supplied fuel, the fuel supply amount can be limited and the ignition pressure can be suppressed.

The regulator proportional valve in the present invention is energized before the original solenoid valve is energized.

At this time, even if the valve proportionality of the regulator proportional valve is difficult to displace, since the fuel pressure is not applied to the regulator proportionality valve, the regulator proportionality valve can be opened simply by applying a force that merely displaces the valve.

Therefore, after the energizer valve is energized, the regulator proportional valve when the regulator proportional valve is energized again is surely opened in accordance with the energization current.

As a result, since the fuel supply amount to the burner can be reliably controlled, there is no gas bleeding in which more fuel is supplied to the burner, and the ignition pressure of the burner does not increase.

Therefore, it can be ignited safely.

Next, the present invention will be described according to the embodiment.

The gas water heater 1 shown in FIG. 1 is provided with the combustor 10 and the heat exchanger 20 in the water heater case 1a. The combustor 10 is controlled by the combustion control device 40. It is stored in the case 1A.

The combustor 10 is disposed below the water heater case 1a, and the fuel gas supplied from the fuel supply pipe 30 is supplied by the combustion air supplied by the blower 11 provided below the water heater case 1a. Specifically, as shown in FIG. 2, a plurality of sheet metal burners 12 are lined up and integrated in the burner case 13 as shown in FIG.

The upper surface of the burner case 13 exposes the flame holes 12a made of a plurality of slits of the respective sheet metal burners 12, and the respective sheet metal burners 12 are exposed on the upper surface of the burner case 13. The secondary supply port 14 for supplying the secondary air to the () is formed between the flame hole (12a) of the adjacent sheet metal burner (12).

Under the burner case 13, the sheet metal burners 12 lining up in the burner case 13 are separated into two sets at the middle of the burner case 13 so that the first burner group 10A and the second burner group are separated. As 10B, two fuel ejection pipes 31 and 32 are arranged at predetermined intervals from the intake air port of the sheet metal burner 12 for use independently of each other.

These two fuel discharge pipes 31 and 32 supply fuel gas to the sheet metal burners 12 separately, respectively, as shown in FIG. 1 upstream of each of the fuel discharge pipes 31 and 32. Similarly, the first solenoid valve 33 and the second solenoid valve 34 which are in charge of fuel supply are provided, respectively.

The first solenoid valve 33 and the second solenoid valve 34 are respectively provided downstream of the dividing pipe 35 for dividing the fuel gas supplied from the fuel supply pipe 30, and according to the control device, each fuel injection pipe ( The fuel gas is supplied to (31) and (32).

The fuel supply pipe 30 is provided with a regulator solenoid valve 37 which adjusts the supply pressure on the downstream side in accordance with the source solenoid valve 36 and the energizing current from the upstream side.

At the end of the burner case 13 at the end of the first burner group 10A side, a spark electrode 15, which is an ignition means, is provided as a discharge electrode of an igniter not shown, and at the end of the second burner group 10B side, a combustor ( The frame rod 16 for detecting the flame of 10) is provided.

The heat exchanger 20 is a water pipe type having a plurality of fans, and the water supply pipe 21 for guiding water to the heat exchanger 20 automatically limits the flow rate in accordance with the inflow temperature of the water. The control device 22 and the water volume switch 23 are provided, and a thermistor 25 for detecting a hot water temperature is provided in the hot water pipe 24 for guiding hot water flowing from the heat exchanger 20 to a hot water not shown. It is provided.

The combustor 10 which has the above structure is controlled by the control apparatus 40 centering on a microcomputer.

As shown in FIG. 3, the control device 40 has the functional parts of the sequence control part 41 and the temperature control control part 42, and the sequence control part 41 of the water flow switch 23 and the frame rod 16 is shown in FIG. In accordance with each detection signal, ignition control and fire extinguishing control are performed in a predetermined order.

In particular, in the present embodiment, in order to obtain a reliable operation of the regulator proportional valve 37 for adjusting the fuel supply amount to the combustor 10 in consideration of the safety at the time of ignition, the solenoid valve 36 opens the fuel gas. The regulator proportional valve 37 is energized before supply.

Accordingly, since the regulator proportional valve 37 can perform the opening operation when the force for controlling the fuel gas is not necessary, the valve body of the regulator proportional valve 37 cannot be displaced when the fuel gas is supplied to perform this control. There is no enemy.

In addition, in this embodiment, the opening time of the second solenoid valve 34 is made later than the opening time of the first solenoid valve 33, so that the ignition timing of each burner group is smooth, and the combustion amount is reduced to reduce the ignition pressure. Is suppressed.

At this time, the first solenoid valve 33 is opened after the original solenoid valve 36 is opened, and accordingly, the pressure of the fuel gas is given to the regulator proportional valve 37 in advance, and the fuel is adjusted by the regulator proportional valve 37. Then, the regulator proportional valve 37 is opened to supply fuel gas at a supply amount regulated by the regulator proportional valve 37.

In addition, during combustion, the temperature controller 42 detects the set temperature by the control unit 43 or the fixed set temperature (for example, 65 ° C.) and the thermistor 25 when the control unit 43 is not connected. The blower 11, the first solenoid valve 33, the second solenoid valve 34, and the regulator proportional valve 37 are controlled by calculating the required heating amount according to the temperature.

Here, the number of revolutions of the blower 11 is adjusted to supply the fuel gas according to the operating state of the blower 11 while controlling the blower 11 by determining the applied voltage to the blower 11 according to the calculated required heating amount. The regulator proportional valve 37 is controlled in accordance with the detected and detected rotational speed, and the first solenoid valve 33 is opened and closed in accordance with the required heating amount to change the combustion amount.

As a result, the second burner group 10B is always in a combustion state during the operation of the hot water heater. That is, it is a burner burner.

The combustion gas generated by the combustion is discharged from the exhaust port 2 provided above the hot water heater case 1a.

Next, control by the control apparatus 40 is demonstrated according to FIG.

When the user opens the hot water stopper and water of a predetermined flow rate or more passes through the heat exchanger 20, the water flow switch 23 is closed to detect water flow, and ignition control is performed.

If there is no ignition instruction at the predetermined time t0, the regulator proportional valve 37 is energized beforehand at a predetermined time t1 before the blower 11 is driven and the combustion gas pressure is applied to prevent gas congestion. It facilitates movement of the rear valve body and closes soon.

On the other hand, the blower 11 performs pre-purge at a predetermined rotational speed to discharge fuel gas and combustion gas due to unburned in the hot water heater case 1a, and generate air flow in the hot water heater case 1a. .

When the pre-purge for a predetermined time at the predetermined time t2 is completed, the control voltage to the blower 11 is changed from the pre-purge voltage to the ignition voltage, and the original solenoid valve 36 is opened, followed by a slightly later time t3. ), The first solenoid valve 33 is opened.

In the spark electrode 15, the spark discharge is started at the time t2 at which the solenoid valve 36 is opened to perform the ignition operation.

During this period, the fuel gas passes through the original solenoid valve 36 and the first solenoid valve 33 and exerts pressure on the valve body (not shown) of the regulator proportional valve 37.

Since the blower 11 is provided with the wing | blade part, even if the control voltage to the blower 11 is changed for ignition, since the rotation speed of the blower 11 does not become an ignition rotation speed immediately, the rotation speed of the blower 11 is adjusted. The detection and the decrease in the ignition speed are detected.

When it is detected that the rotational speed of the blower 11 has become the ignition rotational speed at a predetermined time t4, the regulator proportional valve 37 is energized by the ignition current value.

At this time, since the pressure of fuel gas is applied to the valve body of the regulator proportional valve 37, the opening degree of the regulator proportional valve 37 shows the opening degree for ignition according to an energizing current.

As a result, the fuel gas whose supply amount is adjusted by the regulator proportional valve 37 is supplied only to each sheet metal burner 12 of the 1st burner group 10A, and discharges the flame by the spark electrode 15 which is already operating. Lights up.

In the sheet metal burner 12, the sheet metal burner 12 is ignited from the one closest to the spark electrode 15, and the sheet metal burner 12 is ignited by the first burner group 10A by the displacement of the spark balls of the sheet metal burner 12. FIG.

As a result, the ignition pressure is lower as compared with the case where the fuel gas is simultaneously supplied to all the sheet metal burners 12 of the combustor 10, and ignition with less impact force can be obtained.

On the other hand, after the regulator proportional valve 37 is opened, the second solenoid valve 34 is opened at a predetermined time t5 to supply fuel gas to the sheet metal burner 12 in the second burner group 10B.

All the sheet metal burners 12 have completed ignition, immediately after the ignition of all the sheet metal burners 12 is finished, or most of the sheet metal burners 12 are set to be in the ignition time.

As a result, when the second burner group 10B is transferred to the sheet metal burner 12, the ignition pressure is lowered like the ignition in the first burner group 10A, and safe ignition can be performed.

When the ignition of the second burner group 10B is detected by the frame rod 16, the spark discharge by the spark electrode 15 is stopped, and then the blower is configured to obtain a heating amount determined by the temperature control controller 42. 11) and the regulator proportional valve 37 and the first solenoid valve 33 are controlled to adjust the combustion amount.

As described above, according to the present invention, since the regulator proportional valve is energized before starting the fuel supply, it can be easily opened even when the regulator proportional valve is difficult to open.

Therefore, since the fuel supply amount can be reliably controlled at the time of ignition after the fuel is supplied, it is possible to prevent the occurrence of gas leakage.

In addition, in this embodiment, since the number of sheet metal burners is divided into two groups to limit the fuel supply amount at the time of ignition, the ignition pressure is lowered, and in particular, safe ignition can be performed at re-ignition.

In the above embodiment, a gas water heater having two burner groups is shown, but one burner or burner group may be used, and the burner may be a heater or a bath burner.

Claims (1)

In the control device 40 in connection with the operation of the spark electrode 15 for igniting the burner while installing the solenoid valve 36 and the regulator proportional valve 37 in the middle of the fuel supply path for supplying fuel to the burner. In the control apparatus of the combustor which energizes the original solenoid valve 36 and the regulator proportionality valve 37 sequentially, before the said primary solenoid valve 36 is energized and fuel gas is supplied to the regulator proportionality valve 37, the said control is performed. A combustor control method, characterized in that the sequence controller (41) in the device (40) energizes the regulator proportional valve (37) once for a predetermined time.

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