JPH0351612A - C0ntroller of combustion apparatus - Google Patents

Abstract

PURPOSE:To improve safety by electifying once an electro magnetic proportional valve prior to charging a solenoid valve with electricity in a control device which limits feed quantity of fuel at ignition by means of a proportional control valve. CONSTITUTION:Before a main solenoid valve 36 is opened to feed fuel gas, a governor proportional valve 37 is electrified in advance, whereby operation of the valve 37 can be confirmed by opening it when control of fuel gas is not required, so that, when the fuel gas is supplied and control is performed, troubles that the valve body does not move can be avoided. As a result, safety at ignition can be improved.

Description

[Detailed Description of the Invention] [Industrial Specialist. FIELD OF THE INVENTION The present invention relates to a combustor control (1L device) for safely igniting a burner.

[Prior Art] For example, in a gas water heater, the amount of fuel supplied is adjusted in accordance with the current flowing through the fuel supply path to the burner in order to obtain the amount of combustion that corresponds to the required fuel consumption. A proportional control valve is installed to control the fuel supply. On the other hand, in order to obtain a large ripening capacity, some are equipped with a burner with a large combustion amount or with multiple burners.

At the time of ignition, some types perform so-called cherry ignition, in which the amount of fuel supplied to the burner is limited by a proportional control valve in order to suppress the ignition pressure of the burner.

In this slow ignition, in order to ensure that the proportional control valve restricts the fuel 1'1, the proportional control valve is energized after the solenoid valve installed in the flow of the proportional control valve is energized. be exposed.

That is, by energizing the proportional control valve after fuel pressure is applied to the proportional control valve, the proportional control valve is prevented from opening beyond the cherry ignition opening degree when the proportional control valve is energized.

[Problems to be Solved by the Invention] As described above, when the proportional control valve is energized after the solenoid valve, fuel pressure is reliably applied to the proportional control valve, making it difficult to open the proportional control valve, making it difficult to open the proportional control valve. However, if the proportional control valve itself is difficult to open, such as when the equipment is not used for a long period of time, the valve body of the proportional control valve will become even more difficult to open due to fuel pressure. With a normal electric current for cherry blossom ignition, it is difficult to obtain a driving force for one minute to the valve body, and the valve body may not be displaced.

In such a case, a sufficient control force cannot be obtained for the supplied fuel, and the proportional control valve cannot sufficiently suppress the amount of fuel supplied, resulting in a gas rush.

As a result, a large amount of fuel is supplied to the burner,
The pressure of the flames will increase and there is a possibility that the situation will become dangerous.

An object of the present invention is to improve safety during ignition in a combustor control device in which the amount of fuel supplied during ignition is limited by a proportional control valve.

[Means for Solving the Problems] The present invention provides an electromagnetic on-off valve and an electromagnetic proportional valve in sequence in a fuel supply path that supplies fuel to a burner, and also relates to the operation of an ignition means for igniting the burner. In a combustor control device that sequentially energizes the electromagnetic on-off valve and the electromagnetic proportional valve, the technical means is to energize the electromagnetic proportional valve once before energizing the electromagnetic on-off valve.

[Operation] In the present invention, the electromagnetic proportional valve is once energized before the electromagnetic on-off valve is energized. At this time, since fuel pressure is not applied to the electromagnetic proportional valve, the electromagnetic proportional valve can be easily opened.

After the electromagnetic proportional valve has opened, the electromagnetic on-off valve is energized, and the electromagnetic on-off valve opens, either simultaneously with the activation of the ignition means or after the activation of the ignition means. Fuel pressure is applied to the solenoid proportional valve, and then the solenoid proportional valve is energized.

Therefore, because the electromagnetic proportional valve opens against the force of the supplied fuel, it is possible to limit the amount of fuel supplied and suppress the ignition pressure. [Effects of the Invention] In the present invention, the electromagnetic proportional valve is energized in advance before the electromagnetic on-off valve is energized.

At this time, even if the valve body of the solenoid proportional valve becomes difficult to displace, since fuel pressure is not applied to the solenoid proportional valve, if the force that simply displaces the valve body is applied, the solenoid proportional valve can be easily moved. can be opened.

Therefore, when the electromagnetic proportional valve is energized again after the electromagnetic on-off valve has been energized, the electromagnetic proportional valve opens reliably in accordance with the energized current.

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

Therefore, it can be safely ignited.

[Example] Next, the present invention will be explained based on examples.

The gas water heater 1 shown in FIG. 1 includes a combustor 0 and a heat exchanger 20 in the water heater case la.
are controlled by a control device 40, and are housed within the main body case 1A.

The combustor 10 is arranged below inside the water heater case 1a, and burns the fuel gas supplied from the fuel supply pipe 30 using the combustion air supplied by the blower 11 provided below the water heater case 1a. Specifically, as shown in FIG. 2, a large number of sheet metal burners 12 are integrated in a row inside a bar->-case l3.

A flame port 12a consisting of a large number of slits of each sheet metal burner l2 is exposed on the side of the burner case 13, and a side of the burner case l3 supplies secondary air to each sheet metal burner 12. A secondary air supply port 14 is formed between the flame ports 12a of adjacent sheet metal burners 12.

Below the burner case 13, there is a
Each sheet metal burner 12 arranged in a row is placed in a burner case 13.
Two fuel injection pipes 31 and 32 are separated into two sets at the middle part of each sheet metal burner l2 and are used independently as a first burner group 10A and a second burner group 10B.
It is arranged at a predetermined distance from the air intake port.

These two fuel injection pipes 31 and 32 separately supply fuel gas to each set of sheet metal burners 12,
1 of each fuel injection pipe 31, 32. As shown in FIG. 1, the flow is provided with a first solenoid valve 33 and a second solenoid valve 34 that control fuel supply.

The first electromagnetic valve 33 and the second electromagnetic valve 34 are respectively provided downstream of a branch pipe 35 that branches fuel gas supplied from the fuel supply pipe 30. supply fuel gas to.

The fuel supply pipe 30 includes, from the upstream side, an original solenoid valve 36 and a governor proportional valve 3 that adjusts the supply force measured downstream according to the energized current.
7 are provided in order.

The end of the first burner group IOAIII of the burner case 13 is provided with a spark electrode 15 as a discharge electrode of an igniter (not shown), and the end on the second burner group 10B side is provided with a spark electrode 15 for detecting the flame of the combustor 10. Frame rod 16 for
is provided.

The heat exchanger 20 is of a wood tube type equipped with a large number of fins, and a water supply pipe 21 that leads water to the heat exchanger 20 has a water supply pipe 21 that automatically limits the flow rate of water passing through it according to the inflow temperature of the water. A water supply pipe 24 for guiding hot water flowing out from the heat exchanger 20 to a hot water supply port (not shown) is equipped with a thermistor 2 for detecting the temperature of hot water supply.
5 is provided.

The combustor 10 having the above configuration is controlled by a control device W40 mainly including a microcomputer.

As shown in FIG. 3, the control device 40 has functional parts of a sequence control section 41 and a temperature control section 42. ignition control and extinguishing control are performed in a predetermined sequence.

In particular, in this embodiment, in order to ensure reliable operation of the governor valve 37 that adjusts the amount of fuel supplied to the combustor 10, considering safety during ignition, the former solenoid valve 36 is Before the governor proportional valve 37 is opened and fuel gas is supplied, the governor proportional valve 37 is energized in advance.

As a result, the governor proportional valve 37 can perform an opening operation when no force is required to control the fuel gas, so when the fuel gas is supplied and the control is performed, the valve body of the governor proportional valve 37 cannot be displaced.

Furthermore, in this embodiment, by delaying the timing of opening the second solenoid valve 34 from the timing of opening the first solenoid valve 33, the ignition timing of each burner group is shifted, the combustion amount of each is reduced, and the ignition pressure is increased. It is growing.

At that time, the first solenoid valve 33 is opened after opening the main solenoid valve 36, thereby applying fuel gas pressure to the governor proportional valve 37 in advance, and allowing the governor proportional valve 37 to adjust the fuel. The governor proportional valve 37 is opened to supply fuel gas at a supply rate regulated by the governor proportional valve 37. Also, during combustion, the temperature JSI control section 42
The required ripening amount is calculated based on the set temperature by the controller 43 or the fixed set temperature (for example, 65° C.) when the controller 43 is not connected, and the temperature detected by the thermistor 25, and the blower 11 and the first Here, the blower 11 controls the solenoid valve 33, the second solenoid valve 34, and the governor proportional valve 37, based on the calculated required heating amount.
In order to control the blower l1 by determining the voltage applied to the blower l1, and to supply fuel gas according to the operating state of the blower l1, the rotational speed of the blower 11 is detected and the governor is controlled according to the detected rotational speed. In addition to controlling the proportional valve 37, the opening and closing of the first solenoid valve 33 is controlled depending on the heating required.
Switch the combustion amount.

As a result, the second burner group 10B becomes a so-called constant flame burner that is always in a combustion state during operation of the water heater.

In addition, the combustion gas generated by combustion is removed from the water heater case 1.
soil of a. It is discharged from an exhaust port 2 provided on one side.

Control by the control device 40 will be explained below based on FIG. 4.

When the user opens the hot water tap, water exceeding the predetermined amount flows into the heat exchanger 2.
When it passes through 0, the water flow switch 23 closes, detects water flow, and performs ignition control.

When an ignition instruction is given at time 10, the blower 11 is driven, and in order to prevent gas rush, the governor proportional valve 37 is previously energized and opened at time L1 before fuel gas pressure is applied. , the valve body can be moved easily and closed quickly.

On the other hand, the blower 11 performs pre-purge at a predetermined rotation speed,
Unburned fuel gas and combustion gas within the water heater case la are discharged, and an airflow is generated within the water heater case la.

When the pre-purge for a predetermined time ends at time t2, the air blower fi
The control voltage to ll is changed from the pre-purge voltage to the ignition voltage, and the main solenoid valve 36 is opened, and then, after a slight delay, the first solenoid valve 33 is opened at time t3.

Further, the spark electrode 15 starts spark discharge at time t2 when the original solenoid valve 36 is opened to perform an ignition operation.

During this time, the fuel gas passes through the original solenoid valve 36 and the first solenoid valve 33, and applies pressure to the not-shown valve body of the governor proportional valve 37.

Since the blower 1 is equipped with an impeller, even if the control voltage to the blower 11 is changed to ignition, the rotation speed of the blower 11 will not immediately reach the ignition speed, so the rotation speed of the blower 11 is detected. It is detected that the ignition speed has dropped to the ignition speed.

Time t. When it is detected that the rotation speed of the blower ■1 has reached the ignition rotation speed, the governor proportional valve 3 is activated at the ignition current value.
7 is energized.

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

As a result, the fuel gas whose supply amount is adjusted by the governor proportional valve 37 is supplied to the first burner W. 10 A is supplied only to each sheet metal burner 2 and is ignited by a spark discharge from a spark electric @15 which is already activated.

In the sheet metal burner 12, the one closest to the spark electrode 15 is ignited, and the sheet metal burner 12 as the first burner group 10A is ignited by the flame transfer between the flame ports of the sheet metal burner 12.

As a result, the ignition pressure is lower than when fuel gas is simultaneously supplied to all the sheet metal burners 12 of the combustor 10, and ignition with less impact can be achieved.

On the other hand, at time L5 after the governor proportional valve 37 is opened, the 2'th solenoid valve 34 is opened, and fuel gas is supplied to the sheet metal burner 12 going to the second nozzle group 10B.

Between this time t4 and time t5, the first burner 1! ￥I
In OA, all the sheet metal burners 12 have completed their firing, or immediately after the ignition of all the sheet metal burners 12 of "C" has finished, or when most of the sheet metal burners 12 have finished ignition. It is set as follows.

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

When the flame rod 16 detects the ignition of the second burner 1f\10B, the spark discharge by the spark electrode 15 is stopped, and thereafter the temperature is increased according to the temperature control unit 42.
8fJ. The blower 1l, the governor proportional valve 37, and the first electromagnetic valve 33 are controlled to adjust the combustion amount so that the combustion amount is obtained.

As described above, according to the present invention, the governor proportional valve is energized in advance before fuel supply starts, so even if the governor proportional valve is difficult to open, it can be opened easily (-.ζ7'L'!
<Medicine.

Therefore, at the time of ignition after fuel is supplied, the amount of fuel supplied can be reliably controlled, thereby preventing the occurrence of gas rush.

In addition, in this embodiment, a large number of sheet metal burners are divided into two groups.
Since the amount of fuel supplied at the time of ignition is limited, the ignition power is lowered, and especially in the case of re-ignition, ignition can be carried out cheaply.

In the above embodiment, a gas water heater having two burner groups is shown, but the number of burners or burner groups may be one, and the combustor may be a heater or a burner for a bathtub.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a gas water heater showing an embodiment of the present invention, Fig. 2 is a perspective view showing a combustor of this embodiment, Fig. 3 is a functional block diagram showing the functional configuration of a control device, and Fig. 4 is a schematic diagram of a gas water heater showing an embodiment of the present invention. The figure is a time chart for explaining the operation of this embodiment. In the figure - 10... Combustor (burner), l5... Spark electrode (ignition means), 30... Fuel supply pipe (fuel supply path), 36... Original solenoid valve (electromagnetic on-off valve), 37...
・Governor proportional valve (electromagnetic proportional valve), 40...control device (
combustor control device).

Claims (1)

[Claims] 1) An electromagnetic opening/closing valve and an electromagnetic proportional valve are sequentially provided in a fuel supply path that supplies fuel to the burner, and the electromagnetic opening/closing valve is connected to the operation of the ignition means for igniting the burner. A combustor control device that sequentially energizes a valve and the electromagnetic proportional valve, characterized in that the electromagnetic proportional valve is once energized prior to energizing the electromagnetic on-off valve.