JPS6023720A - Combustion device - Google Patents

Abstract

PURPOSE:To reliably control an amount of the air depending on a combustion amount to increase an excellent regulating range of a combustion amount, by a method wherein a means for feeding the air for combustion is operated at a specified cycle to control an opening or a closed time. CONSTITUTION:The air for combustion from a blower 8 is partially fed through a pipe 10 to a combustion chamber 1 and the rest through a control valve 11 to the combustion chamber. The control valve 11 repeatedly turns ON and OFF a solenoid 15 at an intermittent cycle through the operation of a controller 16. An amount of the air flowing in through a suction port 3 is controlled depending upon a ratio of a time during which the control valve is opened. For such regulation, either a means for controlling one cycle of an opening or a closed time, a means for controlling a cycle in a condition to keep an opening or a closed time at a specified value, or a means for changing an opening or a closed time and a cycle simultaneously, may be employed. A fuel amount is controlled by a controller 17 of a feed oil pump 5, and an optimum amount of the air for maintaining an excellent combustion state in the combustion chamber 1 is controlled by a controller 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion apparatus that controls the amount of air as the amount of combustion increases or decreases.

Conventional configuration and its problems The combustion state is greatly affected by the amount of fuel and air, and if there is too much fuel, it will cause flames or lifting, producing unburned gas, smoke, and odor, and if there is too much air, it will cause flames and lifting. In this case, flashback occurs, unburned gas is generated due to flame turbulence, and odor is produced.

The characteristics when varying the combustion amount vary depending on the shape and configuration of the combustion part, but the maximum combustion amount variable range for good combustion can be achieved when the ratio of fuel and air is controlled within the flammable range. Conventional means for adjusting the amount of air according to the amount of combustion include means for changing the passage area using a damper and means for changing the rotational speed of a blower.

The means to change the flow resistance by changing the passage area by using a damper is to change the passage area by passing a shaft through the passage and rotating a resistance plate attached to this shaft, so the flow is disturbed by the resistance plate. , Since the shaft angle has a large effect on the flow rate in places where the flow rate is low due to shaft wobbling, it is difficult to set a minute flow rate. Therefore, a flow meter is installed separately, and it is observed and controlled (flow rate is controlled). increase/decrease). Further, the method of changing the rotational speed of the blower changes the voltage of the blower or the torque of the blower motor by changing the taps to change the rotational speed of the blower and thereby change the amount of air blown.

Since this means changes the rotational speed of the motor to a lower side, the rotational speed is likely to change due to voltage changes and environmental changes, and there is a lower limit from the initial rotational torque, making it impossible to set a wide range of change in air volume. Therefore, it has been difficult to adjust the amount of air with high precision in accordance with the reduction in combustion amount.

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and has an object to accurately increase or decrease the amount of air according to the amount of combustion, thereby making it possible to widen the range of favorable adjustment of the amount of combustion.

Structure of the Invention The present invention opens and closes a means for supplying air for combustion in a constant cycle, and controls the opening or closing time to accurately increase or decrease the amount of air according to the amount of combustion, thereby achieving good combustion. The amount adjustment range can be widened. That is, when air is pressurized at a constant pressure by means of blowing air and the passage is intermittently opened and closed, the flow rate is proportional to the percentage of time that the passage is open.

In addition, by increasing the number of opening and closing cycles, the pulsation of the flow is reduced and it does not have a large effect on the combustion state and noise.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

A nozzle 2 for supplying fuel to the combustion chamber 1 and an intake port 3 for supplying air are provided, and an air port 4 for cooling the nozzle is provided around the nozzle 2. A fuel tank (not shown) and a fuel pump 5 are connected by a vibro, and the pump 5 and a nozzle 2 are connected by a pipe 7.

The outlet of the blower 8 is connected to the intake port 3 . A branched pipe 9 is provided at the outlet of the blower 8, and the branched part and the air port 4 are connected to each other.
The pipe 9 communicates with a control valve 11, and the outlet of the control valve 11 communicates with the intake port 3 through a pipe 12.

The control valve 11 has a valve body 14 formed of a diaphragm facing the valve seat 13, and the valve body 14 is movable up and down by a solenoid 15, and is connected to a controller 16 that drives the solenoid 15 in a constant cycle. A controller 17 that varies the flow rate of the pump 5 is connected.

Next, the operation will be explained.

The fuel passes through a vibro from a fuel tank (not shown), is guided from a pipe 7 to a nozzle 2 by a fuel pump 5, and is dispersed from the nozzle 2 into particles into the combustion chamber 1. The air used for combustion is then pressure-fed by the blower 8, passes through the pipe 9, is blown from the control valve 11 to the pipe 12, and the air inlet 3, and is supplied to the combustion chamber 1. A portion of the air from the blower 1 is supplied from the pipe 10 to the air port 4 to cool the nozzle 2 and to uniformly scatter the fuel.

The control valve 11 is operated by a controller 16 to cause the solenoid 15 to repeatedly turn on and off in an intermittent cycle. The valve body 14 moves up and down together with the diaphragm 14 in accordance with the on/off state of the solenoid 1.5, and opens and closes the passage formed by the valve seat 13 and the valve body 14. That is, the controller 16 repeatedly opens and closes the air supply passage using the control valve 11 . The amount of air flowing in through the intake port 3 increases or decreases depending on the percentage of time that the control valve is open. This adjustment includes: ■ increasing or decreasing the open time of one cycle; ■ increasing or decreasing the closed time of one cycle; ■ increasing or decreasing the cycle while keeping the open or closed time constant. , any means of simultaneously varying the opening or closing time and cycle may be used. In addition, the amount of fuel is increased or decreased by the controller 17 of the fuel pump 5, and the fuel pump 5 is generally a plunger pump whose flow rate changes with pulse changes, a gear pump whose flow rate changes with the rotation speed, or an ultrasonic vibration amplitude and wave number. There are atomizers that change the flow rate depending on changes in the flow rate.

The controller 17 can increase or decrease the amount of combustion, and the controller 16 can adjust the optimum amount of air to maintain a good combustion state in the combustion chamber 1. That is, the blower 8 always rotates stably at a rotation speed higher than a certain level. Further, since the control valve 11 is repeatedly opened and opened fully, there is no need for minute dimensional and positional control, and the seal between the valve seat and the valve body does not cause leakage.

The electrical opening and closing by the solenoid 15 is highly accurate and has sufficient responsiveness even at 10 to 50 cycles/second.

By connecting the controller 17 that controls fuel and the controller 16 that controls air, the air-fuel ratio can be maintained optimally and the combustion amount can be varied.

In addition, a part of the combustion air is directly connected to the combustion chamber 1, an amount of air corresponding to the minimum combustion amount is supplied, and an amount of air corresponding to the increase in the combustion amount is supplied to the combustion chamber 1 using a vibrator 12 connected to the control valve 11. The supply means reduces flow pulsation caused by turning the control valve 11 on and off, reduces turbulence in combustion, and maintains a good combustion state in a lower combustion amount range.

Effects of the Invention The present invention opens and closes the means for supplying air for combustion in partial cycles and controls the opening or closing time to accurately increase or decrease the amount of air according to the amount of combustion. This allows the combustion amount adjustment range to be widened, improving load controllability and increasing energy savings.

In addition, since the air-fuel ratio can always be controlled with good responsiveness,
Even when there is a sudden change in the amount of combustion, the odors generated by unburned gas can be extremely reduced, resulting in a high degree of safety.

[Brief explanation of the drawing]

The drawing is a sectional view of a combustion device showing an embodiment of the present invention. 1... Combustion chamber, 5... Fuel pump, 8
...Blower, 11...Control valve.

Claims (3)

[Claims] (1) A combustion device in which a means for supplying fuel and a means for supplying air are connected to a combustion chamber, the means for supplying air is opened and closed in a constant cycle, and the time of opening and closing is controlled. (2) The combustion apparatus according to claim 1, wherein the means for supplying air is branched, one of which is directly connected to the combustion chamber, the other of which is opened and closed in a constant cycle, and the time for opening and closing is controlled. (3) The combustion apparatus according to claim 1, wherein the means for supplying air is periodically opened or closed for a certain period of time, and this cycle is characterized by this cycle.