JPH0351646Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a liquid fuel combustion control device for use in a household open combustion heater.

BACKGROUND ART Conventionally, in a liquid fuel combustion control device in which a pump pumps liquid fuel to a heated vaporizer, gasifies it in the vaporizer, and injects the vaporized gas from a nozzle to a burner, the action when extinguishing a fire is as follows: One is to stop the pump and use a needle valve, etc. to instantly stop the ejection of vaporized gas from the nozzle nozzle to extinguish the flame, and the other is to stop the pump and use a needle valve, etc. to immediately stop the ejection of vaporized gas from the nozzle to extinguish the flame. There was one in which the ejection of vaporized gas was stopped to extinguish the fire.

Problems to be solved by the invention In conventional liquid fuel combustion control devices such as those described above, where the pump is stopped and the needle valve is operated at the same time, when a fire is extinguished, the vaporized gas that is the fuel stops instantly. However, due to the ejector effect caused by the ejection energy of vaporized gas, the primary combustion air that had flowed into the burner continues to flow into the burner due to inertia even after the ejection of vaporized gas has stopped, and the air-fuel mixture in the burner becomes a fuel gas. The flame was so thin that it was extinguished by the lift at the flame hole, and the unburnt mixture was released into the room with its odor. On the other hand, in the case where a needle valve, etc. is activated when the fire level falls below a predetermined value due to pump stoppage, it is possible to prevent unburned air-fuel mixture from being released into the room with its odor, as described above. However, since the operation of the needle valve etc. is delayed even during an emergency stop such as when an earthquake occurs, the fire cannot be extinguished instantly and has the disadvantage of causing a fire in the worst case scenario.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks, and includes a control means ( (hereinafter referred to as microcomputer),
In addition, the pump drive circuit for driving the pump and the needle valve drive circuit for driving the needle etc. are connected to the output, and the stop output of the pump drive circuit when the pump is normally stopped is input to the microcomputer. A function that inputs the stop output of the needle valve to the microcomputer when the flame falls below a predetermined value, and a function that inputs the stop output of the pump drive circuit due to the emergency stop signal to the microcomputer, and a needle valve that is activated when the emergency stop signal is issued. The drive output of the needle valve drive circuit is input to the needle valve drive circuit via a vibration detection circuit and a microcomputer.

By doing this, after the pump is stopped under normal usage conditions, the needle valve will operate when the flame drops below a predetermined value, and the inertia of the primary combustion air will prevent it from flowing into the burner. This reduces the odor during fire extinguishing by burning the unburned gas in the burner without lifting it in the flame hole, while at the same time, during emergency fire extinguishing such as an earthquake, when a signal is input from the vibration detection circuit, the pump is stopped and the needle valve is closed. When the operations are performed simultaneously, the ejection of vaporized gas from the nozzle section is instantly stopped, and the flame is also extinguished.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the main parts of the liquid fuel combustion control device according to this embodiment, FIG. 2 is a control circuit diagram, FIG. 3 is a control timing chart, and FIG. 4 is a flowchart of the microcomputer. .

In FIG. 1, reference numeral 1 denotes a pump, the suction port of which is connected to liquid fuel 4 in an oil receiver 3 via an oil feed pipe 2, and the discharge port connected to a vaporizer 6 via an oil feed pipe 5. The vaporizer 6 is equipped with a heater 7 and is connected to a nozzle 9 through a communication pipe 8. A needle valve 10 is provided inside the nozzle 9, and is moved from side to side within the nozzle 9 by a solenoid 11 provided outside the nozzle 9, and is moved from side to side within the nozzle 9 by a pointed head 12 formed at one end to close the spout 13 of the nozzle 9.
It also closes off the pressure relief pipe 15 connected to the nozzle 9 through the other end 14. Reference numeral 17 denotes a frame rod disposed above the burner E, and is used to detect the level of the flame F formed in the tip G of the burner E.

In addition, in Fig. 2, 16 is a DC power supply, and A
is a flame detection circuit, B is a vibration detection circuit, C is a pump drive circuit, and D is a needle valve drive circuit. The flame detection circuit A applies an AC signal between the rod 17 and the burner E, and outputs "H" when the DC signal rectified by the flame F is larger than a preset value, that is, when the flame is normal, and outputs "H" when the flame is normal. At this time, the output is "L", and this signal is input to the input 20 of the microcomputer 19. In the vibration detection circuit B, 21 is a vibration sensor, 22 is a resistor, the vibration sensor 21 is short-circuited when not vibrating, and is open when vibration is occurring, and the signal from the vibration sensor 21 is input to the input 23 of the microcomputer 19. It is something. Also, input 23
is "H" when not vibrating and "L" when vibrating. In the pump drive circuit C, 24 is a resistor, 25 is a transistor, and 26 is a relay. This circuit is operated by the signal of the output 27 of the microcomputer 19, and when the output 27 is "H", the transistor 25 is
Both the relay 26 is turned on, and when the output 27 is "L", the transistor 25 and the relay 26 are both turned off. Further, contacts (not shown) of the relay 26 control energization of the pump 1, and when the relay 26 is turned on, the pump 1 is energized and operates. In the needle valve drive circuit D, 28 is a resistor, 29 is a transistor, and 30 is a relay. This circuit is operated by the signal of the output 31 of the microcomputer 19, and when the output 31 is "H", the transistor 29 and the relay 30 are both turned on. However, when the output 31 is "L", the transistor 29 and the relay 30 are both turned off. relay 30
The contact point (not shown) controls the drive of the solenoid 11 and controls the movement of the needle valve 10 through the drive control of the solenoid 11, and the relay 3
When 0 is turned off, the solenoid 11 is turned off, and the needle valve 10 is the basis for opening the ejection port 13.

Next, the operation of this embodiment will be described.

For example, as shown in FIGS. 3 and 4, when a user instructs a heater (not shown) to stop using an operation switch (not shown), the microcomputer 19 outputs 27 "L". to turn off the relay 26 and stop the pump 1. This stops the supply of liquid fuel 4 to the vaporizer 6. At this stage, the solenoid 11 is turned off and the needle valve 10 opens the jet nozzle 13, so the residual vaporized gas inside the carburetor 6 is discharged from the jet nozzle 13 and is completely combusted by the burner E. As the vaporized gas decreases, the detection level of flame F decreases, and when it finally falls below a predetermined value, flame detection circuit A
The input 20 of the microcomputer 19 changes from "H" to "L" through the output of the microcomputer 19. At this stage, the output 31 changes from "L" to "H", the transistor 29 and relay 30 are turned on, the solenoid 11 is turned on, and the needle valve 10 closes the spout 13.
On the other hand, an earthquake or the like occurs while the heater is in operation, and the seismic sensor 21 operates and changes from a short circuit to an open circuit, and the input 23 of the microcomputer 19 changes from "H" to "L".
Changes to As a result, microcomputer 1
9 changes the output 27 from "H" to "L" and at the same time the output 31 changes from "L" to "H".
Therefore, the needle valve 10 closes the spout 13 at the same time as the pump 1 stops.

Effects of the invention As described above, according to the invention, when the heater is stopped from normal combustion, the needle valve operates when the flame drops below a predetermined value after the pump stops, so the unburnt mixture is A liquid fuel combustion control device that can prevent flames from being released into the room with odors, and when an emergency fire extinguishment is required, such as during an earthquake, the needle valve closes the spout at the same time as the pump stops, so the flame can be instantly extinguished. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a liquid fuel combustion control device according to an embodiment of the present invention, and FIG. 2 is a control circuit diagram of the same.
FIG. 3 is a timing chart of the same control, and FIG. 4 is a flow chart of the control means. A...Operation switch circuit, B...Vibration detection circuit, C...Pump drive circuit, D...Needle valve drive circuit, E...Burner, F...Flame, 1...Pump, 10...Needle valve, 19...control means, 2
1...Seismic sensor.

Claims (1)

[Scope of utility model registration request] A needle valve that pressure-feeds liquid fuel to a heated vaporizer by an oil pump, and blows out the vaporized gas gasified in the vaporizer from a nozzle nozzle and burns it with a burner, and closes the nozzle. In the liquid fuel combustion control device provided in the nozzle, there is a flame detection circuit A that detects the relationship between the flame F formed in the burner E and a predetermined value of the flame F set in advance, and the operation of the seismic sensor 21 and the like. a vibration detection circuit B that generates an emergency stop signal, and the pump 1.
A pump drive circuit C for driving and controlling the needle valve 10, a needle valve drive circuit D for driving the needle valve 10, and a control means 19, and a flame detection circuit A and a vibration detection circuit B are connected to the inputs of the control means 19. A pump drive circuit C is connected to the output of the control means 19.
and the needle valve drive circuit D are connected, and the stop output of the pump drive circuit C when the pump 1 is normally stopped is inputted to the control means 19, and the pump 1 is
A function of inputting the drive output of the needle valve 10 driven by a predetermined value of the flame F after stopping to the needle valve drive circuit D via the flame detection circuit A and the control means 19, and a function of pump drive by an emergency stop signal. It has a function of inputting the stop output of the circuit C to the control means 19 and inputting the drive output of the needle valve 10 which is driven when the signal is generated to the needle valve drive circuit D via the vibration detection circuit B and the control means 19. A liquid fuel combustion control device characterized by: