JPH04270814A - Method of initial of gun type burner - Google Patents

Abstract

PURPOSE:To present a method of initial adjustment of a gun type burner by which the subsequent combustion control can be executed well regardless of the scatter in the characteristics of respective burners by carrying out the initial adjustment before shipment or at the time of replacing nozzle, etc. CONSTITUTION:A controller 10 drives a stepping motor 27 from a standard position so as to bring the quantity of combustion of the fuel to a specified quantity of combustion. The controller 10 stores in memory the number of the steps at this time. The motion is effected for the specified quantity of combustion of at least one kind.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for initial adjustment of a gun-type burner.

0002

[Prior Art] A conventional gun type burner includes a shielding plate having holes, a nozzle that can manually adjust the distance between the shielding plate and the nozzle that injects fuel, and a nozzle that injects fuel by moving the nozzle to adjust the distance between the shielding plate and the shielding plate. A configuration that includes a stepping motor that changes the amount of fuel and a control device that drives the stepping motor, and controls the combustion amount by changing the distance between the shield plate and the nozzle to change the amount of fuel that passes through the hole in the shield plate. Met.

0003

[Problems to be Solved by the Invention] However, in conventional gun-type burners, even if there are two burners of the same type as shown in FIG. The relationship between the amount of fuel passing through the holes, that is, the amount of combustion, is different, and combustion control is sometimes difficult. In other words, the control device drives the stepping motor by a combination of feedforward control and feedback control, but the feedforward control is performed by uniformly determining the relationship between the nozzle position and the combustion amount in advance, and the variation in characteristics of individual burners is eliminated. If an attempt is made to absorb this through feedback control, the amount of adjustment by feedback control is too large and it takes a long time to reach the target combustion amount, resulting in poor control response and poor combustion control. there were.

[0004] The present invention provides an initial adjustment method for a gun-type burner, which allows subsequent combustion control to be performed satisfactorily regardless of variations in the characteristics of individual burners, by carrying out the method before shipment or when replacing the nozzle. The purpose is to provide

[0005]

[Means for Solving the Problems] The present invention provides a shielding plate having holes, a nozzle for injecting fuel, a stepping motor that moves the nozzle to change the distance from the shielding plate, and a stepping motor that moves the nozzle to change the distance from the shielding plate. initial adjustment of a gun-type burner configured to control combustion amount by changing the distance between the shielding plate and the nozzle to change the amount of fuel passing through the hole of the shielding plate; In this case, the stepping motor is driven from a reference position by the control device so that the amount of fuel burned becomes a predetermined combustion amount, and the control device stores the number of steps at this time. It is characterized in that it is performed for a predetermined combustion amount.

[0006]

[Operation] The control device drives the stepping motor from the reference position so that the amount of fuel burned becomes a predetermined amount. The control device stores the number of steps at this time. This operation is performed for at least one type of predetermined combustion amount.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. FIG. 2 is a schematic overall configuration diagram of a water heater equipped with a gun-type burner adjusted by the initial adjustment method according to an embodiment of the present invention, in which the heat exchanger 1 is connected to the gun-type burner 2.
and pipe 3. An inlet pipe 4 is connected to one end of the pipe 3, and an outlet pipe 5 is connected to the other end of the pipe 3.
is connected. The water inlet pipe 4 is equipped with a flow rate detector 6 and a water temperature detector 7 consisting of a thermistor, and the hot water outlet pipe 5 is equipped with a hot water temperature detector 8 consisting of a thermistor and a flow rate adjustment valve 9. . Flow rate detector 6 and water temperature detector 7
The output ends of the and hot water temperature detector 8 are connected to the input ends of a control device 10 equipped with a microcomputer, etc., and the output ends of the control device 10 are connected to the gun type burner 2 and the flow rate regulating valve 9.
are connected to each input end. A remote controller 11 is connected to the control device 10.

The control device 10 calculates the required output number, that is, the amount of fuel to be supplied for combustion, based on detection signals and setting signals from the flow rate detector 6, water temperature detector 7, and remote controller 11. Then, a control signal is output to the gun type burner 2 based on the calculation result, and the nozzle position and damper opening degree are adjusted by feedforward control. Further, the control device 10 calculates the difference between the outlet temperature and the set temperature based on the detection signal from the hot water temperature detector 8, outputs a control signal to the gun type burner 2 based on the calculation result, and controls the nozzle by feedback control. Finely adjust the position and damper opening. The control device 10 also controls the flow rate regulating valve 9 to prevent excessive outflow.

FIG. 1 is a configuration diagram of a gun type burner 2, in which a nozzle 14 is attached to one end of a nozzle adapter 13, and an injection port 15 of the nozzle 14 communicates with a fuel pipe 16. Nozzle adapter 13 is nozzle adapter guide 1
7, and a shielding plate 18 is attached to the nozzle adapter guide 17. Shielding plate 18
A hole 19 facing the injection port 15 of the nozzle 14 is formed in the nozzle adapter guide 17, and an ignition rod 20 whose tip is located near the hole 19 of the shielding plate 18 is attached to the nozzle adapter guide 17. The space between the nozzle 14 and the shielding plate 18 communicates with a recovery pipe 21, and an annular flange 22 is provided protruding near the other end of the nozzle adapter 13. A coil spring 23 is interposed between the nozzle adapter guide 17 and the flange 22 to bias the nozzle adapter 13 toward the other end (right side in FIG. 1), and a male thread is attached to the outer periphery of the other end of the nozzle adapter 13. 25 is formed. Male thread 25
An adjustment screw 26 is screwed into the. A male thread 29 is formed in the middle of the output shaft 28 of the stepping motor 27, and a holder 31 is screwed into the male thread 29. A steel ball 32 is interposed between the adjusting screw 26 and the output shaft 28. The nozzle adapter guide 17 and the holder 31 are attached to a case 33 of the gun type burner 2, and a fan 34 is attached to the case 33. A servo motor 35 and a damper 36 are attached to the fan 34, and the damper 36 is driven by the servo motor 35. An output end of the control device 10 is connected to a stepping motor 27 and a servo motor 35. Although not shown, the output shaft 28 of the stepping motor 27 is limited to reciprocating rotation within a predetermined angle range smaller than 360 degrees, and two detectors connected to the control device 10 serve as detectors for the output shaft 28 of the stepping motor 27. A limit switch is provided.

The control device 10 controls the stepping motor 2.
7 is driven, the output shaft 28 rotates, thereby moving the output shaft 28 in the axial direction. Since the nozzle adapter 13 is pressed against the output shaft 28 by the coil spring 23 via the flange 22, adjustment screw 26, and steel ball 32,
The nozzle adapter 13 and the nozzle 14 move together with the output shaft 28, and the distance between the injection port 15 of the nozzle 14 and the shielding plate 18 changes. As a result, the amount of fuel that passes through the hole 19 of the shielding plate 18 among the fuel ejected from the injection port 15 of the nozzle 14 changes, and the amount of combustion changes. Note that the fuel is supplied to the injection port 15 of the nozzle 14 via the fuel pipe 16 at a predetermined pressure that provides a good atomization state by a fuel pump (not shown), and the fuel is supplied to the injection port 15 of the nozzle 14 through the fuel pipe 16 without passing through the hole 19 of the shielding plate 18. The captured fuel is recovered through the recovery pipe 21. on the other hand,
When the servo motor 35 is driven by the control device 10,
The damper 36 rotates, and the amount of air sucked into the fan 34, ie, the amount of air for combustion, changes. Note that the stepping motor 27 has a built-in potentiometer (not shown), and the rotation angle of the output shaft 28 is detected by the potentiometer and fed back to the control device 10.

FIG. 3 is a front view of the operating section of the control device 10.
A push button switch 38 is installed in the operation section of the control device 10 for initial adjustment of the gun type burner 2.

Next, the initial adjustment work of the gun type burner 2 will be explained with reference to FIG. Figure 4 shows nozzle 1
4 is an explanatory diagram of the relationship between the position of No. 4 and the amount of combustion, in which the horizontal axis represents the number of steps of the stepping motor 27, and the vertical axis represents the amount of combustion. First, the operator fully opens the water tap (not shown) and operates the push button switch 38 of the control device 10. As a result, the control device 10 enters the initial adjustment mode, and the control device 10 controls the stepping motor 27, flow rate adjustment valve 9, and servo motor 3.
Output signals are provided to the fan motor of fan 5 and fan 34, the ignition rod 20, and the fuel pump. As a result, the output shaft 28 of the stepping motor 27 rotates to the minimum position of the rotation range, the flow rate adjustment valve 9 adjusts the amount of hot water to 5 liters per minute, the fan motor of the fan 34 rotates, and the servo motor 3
The output shaft of No. 5 rotates, the damper 36 becomes open to the degree corresponding to the combustion amount a, and combustion starts. Next, the control device 10
The stepping motor 27 is driven so that the rotation angle of the output shaft 28 detected by the potentiometer is at the reference position α. Next, the control device 10 drives the stepping motor 27 while monitoring the detection signal from the hot water temperature detector 8 until the combustion amount reaches a predetermined combustion amount a. Then, the control device 10 stores the number of steps A-α of the stepping motor 27 required to change the combustion amount from the reference position α to a in a memory (not shown). Thereafter, when the operator operates the push button switch 38, the control device 10 is switched to the normal operation mode.

Through the above operations, the number of steps A-α of the stepping motor 27 from the reference position α to the combustion amount a can be determined, and from this the slope of the combustion amount in FIG. 4 can be determined. Therefore, during feedforward control in subsequent normal operation, the control device 10 controls the stepping motor 2 according to the target combustion amount based on A-α stored in the memory.
Control is performed by calculating the number of steps of 7. Therefore, only a small amount of control is required by feedback, and control responsiveness is improved. That is, during normal operation, the control device 10 first rotates the stepping motor 27 to the minimum position of the rotation range when the power is turned on, then rotates it to the reference position α, and further rotates it to the position of step A. . If the water bottle is opened, the number of steps of the stepping motor 27 corresponding to the target combustion amount is calculated based on A, and the stepping motor 27 is driven to perform feedforward control. Then, the stepping motor 27 is driven based on the signal from the hot water temperature detector 8 to perform feedback control. The number of steps is calculated each time the target combustion amount changes.

In the above embodiment, only one combustion amount a, which is the predetermined combustion amount, is set, but for example, the combustion amounts a1, a2
, a3, the number of steps A1 −α, A2 −α
, A3 -α may be calculated and stored in a memory. By increasing the number of measurement points in this way, more accurate control can be achieved. Further, in the above embodiment, the reference position α is detected by a potentiometer, but the reference position may be the minimum position of the rotation range of the stepping motor 27 detected by a limit switch. Furthermore, in the above embodiment, the damper 3
Although the amount of combustion air is adjusted in accordance with No. 6, the rotation speed of the fan motor may also be controlled. Further, it is preferable that the memory of the control device 10 be backed up by a battery, or use an EEPROM or the like in case of a power outage or the like. Note that the above initial adjustment method is not limited to before shipping or when replacing the nozzle 14, but may be performed as appropriate, for example, every time the water bottle is opened and closed 100 times. In this way, even if the relationship between the position of the nozzle 14 and the number of steps of the stepping motor 27 changes for some reason due to long-term use, a good control state can be restored.

[0015]

According to the present invention, the stepping motor is driven from a reference position by a control device so that the amount of fuel burned becomes a predetermined amount, and the number of steps taken at this time is stored by the control device. Since the operation is performed for at least one type of predetermined combustion amount, the relationship between the nozzle position and the combustion amount can be accurately detected, so that the feedforward control amount can be appropriately calculated during subsequent normal operation.
Combustion control can be performed well.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a gun-type burner adjusted by an initial adjustment method in an embodiment of the present invention.

FIG. 2 is a schematic overall configuration diagram of a water heater equipped with a gun-type burner adjusted by an initial adjustment method in an embodiment of the present invention.

FIG. 3 is a front view of the operating section of the control device.

FIG. 4 is an explanatory diagram of the relationship between the nozzle position, combustion amount, and damper opening degree.

FIG. 5 is an explanatory diagram of variations in burner characteristics.

[Explanation of symbols]

2 Gun type burner 10 Control device 14 Nozzle 18 Shielding plate 19 hole 27 Stepping motor

Claims (1)

[Claims] 1. A method comprising a shielding plate having a hole, a nozzle for injecting fuel, a stepping motor for moving the nozzle to change the distance from the shielding plate, and a control device for driving the stepping motor, When initially adjusting a gun-type burner configured to control the combustion amount by changing the distance between the shielding plate and the nozzle to change the amount of fuel passing through the hole in the shielding plate, the amount of fuel burned is The stepper motor is driven from a reference position by the control device so as to achieve a predetermined combustion amount, and the control device stores the number of steps at this time for at least one type of the predetermined combustion amount. Initial adjustment method for gun type burner.