JPH01114615A - Automatic correcting device for air register - Google Patents

Abstract

PURPOSE:To make a stable combustion and enable a restriction of generation of nitrogen oxide gas to be carried out by a method wherein a calculater is provided to be connected to a generator for producing a signal of opening direction and another signal of closing direction, correcting a difference in opening and closing directions and outputting a signal to a driving motor for dynamic vanes of an air register. CONSTITUTION:An instruction signal for increasing a degree of opening from its zero state to 30%, for example, is inputted to a degree of opening setting unit 1. A discriminator 2 may discriminate an opening direction. In this case, an opening direction signal generator 3 produces a reference value, and a program signal produced by the opening direction signal generator 3 passes through a calculator 5 and is sent to a motor 7. A degree of opening of a dynamic vane 6 of an air register shows 30% in an opening direction. When an instruction for changing a degree of opening from this state to 20% for example is inputted to a degree of opening setting unit 1, the direction discriminator 2 discriminates it as a closing direction. Then, a closing direction program is inputted to the calculator 5. A correction circuit is formed between a closing direction program signal generator 4 and the calculator 5 and a program signal that is always similar to the reference value is sent to a motor 7. Its hysteresis is automatically corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic correction device for an air register for supplying air to an oil burner for boiler combustion.

[Prior Art] Air is supplied to the combustion device of a boiler along with fuel by an air register to stabilize the flame and adjust the timing of the supply of combustion air, and the combustion status is controlled by changing the opening degree of the air register. Changes greatly.

FIG. 2 is an explanatory diagram showing the structure of the air register. The air register main body a has one side surface closed and an opening d formed on the other side surface C. A plurality of rotor blades e are arranged along the outer periphery of the air register body a. A shaft f is rotatably attached to the side surfaces A and C. Each of the shafts r is rotated by a motor 9 via a link mechanism (not shown), etc., and the rotor blade e is rotated in the opening direction or the closing direction to adjust the opening degree. Air enters from the tangential direction of the outer circumference of the air register body a, and enters the moving blade e.
According to the degree of opening of , the fuel exits from the opening d as shown by the arrow and is supplied to the combustion device (burner).

[Problems to be Solved by the Invention] As described above, when the motor 9 rotates the movable mechanism in the opening direction, it follows the path of the A curve shown in FIG. 3 over time and reaches 100% opening. . However, when the motor g is reversely rotated from the 100% opening degree to move the rotor blade e in the closing direction, the path does not follow the path of the above-mentioned curve A;
A curve curved outward like a curved line is drawn, and a so-called hysteresis loop is formed by the A curve and the 8 curve. This indicates that the rotation of the rotor blade in the closing direction is delayed with respect to the rotation of the blade in the opening direction, and indicates that the amount of air supplied from the air register to the burner is not accurately controlled. As a result, combustion in the boiler changes between when the rotor blades are opened and when they are closed, resulting in an unstable state of combustion. Conventionally, the opening degree of the rotor blades was only mechanically adjusted, and there was no device that automatically corrected it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control circuit device that automatically corrects the hysteresis of the opening path in the opening and closing directions of the moving blades of an air register.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances, and includes an opening setting device for air register rotor blades, and a direction for determining the opening/closing direction based on a signal from the opening setting device. a discriminator, a program signal generator connected to the direction discriminator and input with program signals for the open direction and the close direction based on measured values, and a program signal generator connected to both signal generators for the open direction and the close direction. The present invention is characterized in that an automatic correction control circuit is constituted by an arithmetic unit that corrects the deviation in the closing direction and outputs a signal to the drive motor of the air register rotor blade.

[Function] When a signal to set the opening degree is sent to the opening setting device, the direction discriminator determines whether it is the open direction or the close direction. For example, if the open direction is used as the reference, an open signal is output. A signal is sent to the program signal generator in the opening direction, which drives the motor via the arithmetic unit to rotate the air register rotor blade in the opening direction to the set opening degree. On the contrary, at this time, when a signal indicating the opening degree in the closing direction is sent to the opening setting device, the direction discriminator sends a signal to the program signal generator for the closing direction, and further a signal is input to the arithmetic unit. On the other hand, since a signal is also input to the computing unit from the program signal generator in the direction, this computing unit corrects the difference due to hysteresis and sends a signal to the motor to move the air register rotor blades in the closing direction to the set opening. Rotate.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. 1 is an opening setting device for setting the opening of the moving blade, and 2 is a direction discriminator that determines whether the opening direction is the opening direction (A in Figure 3) or the closing direction (B in Figure 3). It is. 3 is an open direction program signal generator based on a measured value, 4 is a close direction program signal generator based on a measured value whose data is also taken in advance, and 5 is an arithmetic unit.

The computing unit 5 is connected to a motor 7 connected to an air register rotor blade 6 .

Next, the operation will be explained. In this case, a case where control is performed based on the opening direction will be described.

For example, a command signal to increase the opening degree from zero to 30% is input to the opening degree setting device l. When the signal is sent from the opening setting device 1 to the direction discriminator 2, the discriminator 2 determines the opening direction since it is an increase command and sends a signal to the opening direction program signal generator 3.

send. In this case, since the opening direction signal generator 3 is set as a reference value, the program signal from the opening direction signal generator 3 is sent to the motor 7 through the computing unit 5, and the air register rotor blade 6 is The motor 7 is driven so that the opening degree is 30% in the opening direction.

Further, from the above state, when a command signal to set the opening degree to 20% is inputted to the opening degree setter 1, the direction discriminator 2 determines the closing direction because it is a decreasing command, and the opening direction program signal generator 4 A signal is sent to the closing direction program and the closing direction program is input to the calculator 5.

On the other hand, the opening direction program set as a reference value is also input from the signal generator 3 to the computing unit 5, where the error of the closing direction program is added up and a signal is sent to the motor 7 to drive the rotor blades 6. do. That is, a correction circuit is formed between the closing direction program signal generator 4 and the arithmetic unit 5, and in order to always send a program signal similar to the reference value to the motor 7, the above-mentioned hysteresis is automatically corrected. Also, motor 7
The rotation is detected by a rotation detector 8 and fed back to the program signal generators 3 and 4.

In addition, in the above-mentioned embodiment, the open direction program signal generator 3
However, on the contrary, the closing direction program signal generator 4
It goes without saying that various changes can be made without departing from the gist of the invention.

[Effects of the Invention] According to the present invention, since the hysteresis of the opening degree of the air register rotor blade in the opening direction and the closing direction is automatically corrected, the amount of air supplied to the burner is accurately controlled and combustion is stabilized. , and can also exhibit various excellent effects such as being able to suppress the generation of nitrogen oxides.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an automatic correction device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the structure of an air register, and FIG. 3 is a diagram showing the relationship between the openings of rotor blades in the opening direction and the closing direction. In the figure, 1 is an opening setting device, 2 is a direction discriminator, 3 is an open direction program signal generator, 4 is a close direction program signal generator,
5 is a computing unit, 6 is an air register rotor blade, and 7 is a motor.

Claims (1)

[Claims] 1) An opening setting device for air register rotor blades, a direction discriminator that determines the opening/closing direction based on a signal from the opening setting device, and an opening direction and closing device connected to the direction discriminator and based on measured values. A program signal generator that receives program signals for each direction, and a computing unit that is connected to both signal generators, corrects deviations in the open direction and close direction, and outputs signals to the drive motor of the air register rotor blade. An automatic correction device for an air register, characterized in that an automatic correction control circuit is configured by the following.