JPH04270815A - Method of controlling fuel quantity of gun type burner - Google Patents

Abstract

PURPOSE:To provide a method of controlling the fuel quantity in which the fuel quantity supplied for combustion is controlled by changing the position of nozzle and which requires no device to detect the position of the nozzle and in which the nozzle can be adjusted to a required fuel quantity rapidly and exactly and develops no shortage of the fuel nor excess of the fuel transient ly. CONSTITUTION:The relation between the number of respective steps of a stepping motor 27 from a standard position and the fuel quantity supplied for combustion at that time is beforehand stored in the memory of a controller 10, and for the required fuel quantity accompanying combustion control the controller 10 rotates the stepping motor 27 by feedforward up to the corresponding number of steps.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of fuel in a gun-type burner.

0002

[Prior Art] A conventional gun type burner is equipped with a movable nozzle and a shielding plate fixed to the fuel injection side of the nozzle. Only the fuel that passes through the holes drilled in the shielding plate is used for actual combustion, so the amount of fuel actually used for combustion depends on the distance between the nozzle and the shielding plate, that is, the nozzle position. The amount of fuel used for combustion is controlled by changing the nozzle position.

0003

However, in conventional gun-type burners, a nozzle position detector is used to move the nozzle to a predetermined position by feedback control, as proposed by Utility Model Publication No. 2-38190, for example. , it takes a long time to move it to a predetermined position, and combustion during that time has the problem of fuel shortage or excess fuel. Another disadvantage is that separate equipment for a nozzle position detector is required.

The present invention eliminates the above-mentioned conventional drawbacks and provides a gun-type burner that controls the amount of fuel supplied for combustion by changing the nozzle position, without requiring a device for detecting the nozzle position. The purpose of the present invention is to provide a fuel amount control method for a gun-type burner that can quickly and accurately adjust the amount of fuel to the required amount and that does not cause transient fuel shortage or excess fuel.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the fuel amount control method for a gun type burner of the present invention includes a shielding plate having holes, a nozzle for injecting fuel, and a method for controlling the amount of fuel by moving the nozzle. A stepping motor that changes the distance to the shielding plate, and a controller that controls the stepping motor, and 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. A method for controlling the amount of fuel in a gun type burner, which controls the amount of fuel supplied for combustion, the method comprising:
The relationship between the number of steps from the reference position of the stepping motor and the amount of fuel supplied for combustion at that time is stored in advance in the controller, and the controller controls the stepping motor according to the amount of fuel required for combustion adjustment. It is characterized by feedforward rotation up to the corresponding number of steps.

[0006]

[Operation] When the required amount of fuel is determined with combustion adjustment, the corresponding number of steps from the reference position of the stepping motor is stored in advance, so the controller rotates the stepping motor to reach that number of steps. As a result, the nozzle moves to a predetermined position without requiring a nozzle position detection device, and the required amount of fuel passes through the shield plate and is used for combustion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. FIG. 1 is a block diagram of a gun-type burner, and FIG. 2 is a diagram showing the relationship between the number of steps from a reference position of a stepping motor stored in a controller and the amount of fuel supplied for combustion.

A nozzle 14 is attached to one end of the nozzle adapter 13.
is installed, and the injection port 15 of the nozzle 14 communicates with a fuel pipe 16. The nozzle adapter 13 is slidably supported by a nozzle adapter guide 17, and a shielding plate 18 is attached to the nozzle adapter guide 17. The shielding plate 18 is formed with a hole 19 facing the injection port 15 of the nozzle 14, and the nozzle adapter guide 17 has an ignition rod 2 whose tip is located near the hole 19 of the shielding plate 18.
0 is attached. 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. The nozzle adapter 13 is placed between the nozzle adapter guide 17 and the flange 22 on the other end side (the right side in FIG. 1).
A coil spring 23 is interposed to bias the coil spring 23 . A driven shaft 25 is formed at the other end of the nozzle adapter 13 . 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 3 is provided between the passive shaft 25 and the output shaft 28.
2 is interposed. The nozzle adapter guide 17 and the holder 31 are attached to a case 33. Note that the stepping motor 27 is limited to reciprocating rotation within a predetermined angle range smaller than 360 degrees (for example, 315 degrees).
The angle range is divided into 1050 steps and stored in the microcomputer of the controller 10. ), two limit switches connected to the controller 10 are provided on the stepping motor to detect both ends thereof.

In response to a signal sent from the controller 10, the stepping motor 27 moves the output shaft 2 by the required number of steps.
8 is rotated, and this rotational movement causes the passive shaft 25 to move linearly by a converting section consisting of a screw 29 and a steel ball 32. As a result, the nozzle adapter 13 and the nozzle 14 move linearly, 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 fuel supplied for combustion changes. The fuel is supplied to the injection port 15 of the nozzle 14 through the fuel pipe 16 at a predetermined pressure that ensures good atomization by a fuel pump (not shown).
is supplied to the shielding plate 1 without passing through the hole 19 of the shielding plate 18.
The fuel captured in 8 is recovered through a recovery pipe 21.

The controller 10 has a built-in microcomputer (hereinafter referred to as microcomputer). This microcomputer stores a pre-obtained "relationship between the number of steps of the stepping motor from the reference position and the amount of fuel supplied for combustion at that time." The above-mentioned "relationship" is the number of steps when stepping the stepping motor 27 from the 0 point limiter position and the shielding plate 1.
The relationship with the amount of fuel supplied in excess of 8 can be obtained by obtaining data in advance, and the obtained "relationship" may be memorized in the microcomputer. An example of the above-mentioned "relationship" is illustrated in an analog form in FIG. 2 to make it easier to understand. That is, the amount of fuel as shown by the solid line is uniquely related to the number of steps of the stepping motor 27.

[0011] Now, combustion is being performed with the amount of fuel being supplied for combustion being represented by a in Fig. 2, and the number of steps from the zero point limiter of the stepping motor corresponding to the nozzle 14 position being represented by A. Suppose there is. At this time, when a different combustion state is set by a remote controller (not shown), the remote controller in the controller 10 newly calculates the required fuel amount. Assuming that the result of this calculation is b, the microcomputer further selects the number of steps B from the stored "relationship", calculates B-A, and feedforwardly rotates the stepping motor by the difference. This rotation causes nozzle 1
4 moves accurately and quickly to the position of step number B, b
amount of fuel is provided for combustion via the shielding plate 18.

0012

Effects of the Invention The present invention has the configuration and operation described above, and according to the fuel amount control method for a gun type burner described in the claims, the number of steps from the reference position of the stepping motor and the amount of fuel supplied to combustion at that time are determined. The relationship between the amount of fuel and the amount of fuel required for combustion adjustment is stored in advance in the controller, and the controller feedforwardly rotates the stepping motor up to the number of steps corresponding to the amount of fuel required for combustion adjustment, so the nozzle position can be detected. There is no need to use a method of detecting with a device and moving it to a predetermined position.
That is, the nozzle can be quickly moved to the required fuel amount position without attaching a nozzle position detector. Therefore, it is also possible to prevent combustion caused by a transient fuel shortage or excess fuel.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a gun-type burner in which the method of the present invention is implemented.

FIG. 2 is an explanatory diagram showing an example of the relationship between the number of steps from a reference position of a stepping motor stored in a controller and the amount of fuel supplied for combustion.

[Explanation of symbols]

10 Control device 14 Nozzle 18 Shielding plate 19 hole 27 Stepping motor

Claims (1)

[Claims] 1. A system comprising: a shielding plate having a hole; a nozzle for injecting fuel; a stepping motor for moving the nozzle to change a distance from the shielding plate; and a controller for controlling the stepping motor; A fuel amount control method in a gun type burner, wherein the amount of fuel supplied for combustion is controlled by changing the distance between the plate and the nozzle to change the amount of fuel passing through the hole of the shielding plate. The controller stores in advance the relationship between the number of steps from the reference position of the stepping motor and the amount of fuel supplied for combustion at that time, and the controller controls the stepping motor according to the amount of fuel required for combustion adjustment. A fuel amount control method for a gun type burner, characterized in that the fuel amount is controlled by rotating the fuel in a feedforward manner up to a corresponding number of steps.