JPH02157516A - Controller for evaporator type burner - Google Patents

Abstract

PURPOSE:To reduce operation by a method wherein the title controller is provided with an instantaneous voltage reduction detecting unit, detecting the instantaneous voltage drop of a solenoid control circuit, and when the same unit has detected an instantaneous voltage drop within a predetermined range during the attraction of a solenoid, a high voltage is impressed on the solenoid for a short time to attract strongly. CONSTITUTION:When the instantaneous voltage drop of an AC power source 24 is generated and the impressing voltage on a solenoid 14 is reduced at a time (t3) during combustion, a movable body 13 is released from the attracted condition thereof. This voltage drop is detected by an instantaneous voltage drop detecting unit 41 and a signal is outputted into the INT input of a microcomputer 36. When the microcomputer 36 receives the INT input, the offering process of a program is effected and a relay contact 28 is put ON. When the relay contact 28 is put ON, a impressing voltage on the solenoid 14 is increased to a voltage VH when the AC power source is restored to the initial voltage thereof, the movable body 13, almost released from the attracted condition thereof, is attracted again strongly and the burning condition of a burner is continued without closing a nozzle hole 11. The relay contact 28 is put OFF at a time (t5) and control is returned to the burning condition again. According to this method, malfunction such as abnormal extinguishing and the like on the half way of the combustion can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a vaporization type combustion machine in which vaporized gas vaporized in a vaporizer is ejected through a nozzle hole and combusted in a burner. be.

[Conventional technology]

FIG. 5 is a sectional view of this type of vaporizing combustion machine. In the figure, 1 is an oil tank, 2 is an electromagnetic pump for supplying kerosene 3 from the oil tank 1 to the vaporizer 4 through the oil pipe 5, 6 is a heater that heats the vaporized W 44, and a temperature sensor 7 is used during combustion. The temperature of the vaporized VF 44 is kept constant.

8 is an outer tube communicating with the carburetor 4, and has a nozzle hole 11 opening facing a burner 10 in which an ignition device 9 is disposed.

12 is a needle with a needle-shaped tip for opening and closing the nozzle hole 11, 13 is a movable piece integrated with the needle 12, 14 is a solenoid for moving the movable piece 13, and 15 is a solenoid 14. The coil spring 1B, which presses the movable piece 13 leftward in the drawing to close the nozzle hole 11 when no electricity is applied, allows kerosene to communicate with the oil tank 1 when the nozzle hole 11 is open by energizing the solenoid 14. This is a return valve for preventing flow to the return pipe 1 side, and is integrated with the movable piece 13.

Next, the operation of the vaporization type combustion machine having the above configuration will be explained.

First, the heater 6 is energized to heat the vaporizer 4. When the temperature of the vaporizer 4 detected by the temperature sensor 7 reaches a predetermined temperature and preheating is completed, the electromagnetic pump 2 is operated to supply kerosene from the oil tank 1 to the vaporizer 4 through the oil feed vibrator 5. 1, it is heated and becomes a vaporized gas.

At this time, when the solenoid 14 is energized, the needle 12
slides to the right in the figure to open the nozzle hole 11.

Therefore, the vaporized gas is ejected from the nozzle hole 11, and at that time, primary air, which acts as combustion air, is sucked in from the surroundings.
The air-fuel mixture is ignited by the ignition device W9, which starts discharging at the same time as the preheating of the upper part of the burner 10 is completed, and combustion begins.

FIG. 6 is a solenoid control circuit diagram of a conventional evaporative combustion machine disclosed in Japanese Utility Model Publication No. 61-4101.

In the figure, 14 is a solenoid, 20, 21° 22.2
3 is a diode for rectifying the AC power supply 24 and providing DC power to the solenoid 14; 25 is an AC type 1112;
4 step down transformer, 2G.

27, together with the diodes 22 and 23, performs full-wave rectification of the secondary voltage of the transformer 25 and supplies the solenoid 14 with low voltage direct current. !
28 is the timer circuit Ws2.
9 is a contact such as a relay that closes in the evening, and 30 is a contact such as a relay that turns on/off energization to the solenoid 14.

The electrical operation of the solenoid 14 in the circuit of FIG. 6 will be explained with reference to FIG.

During the preheating period of vaporizer W#4, no voltage is applied to the solenoid 14, and the nozzle hole 11 is in a closed state.

Next, at time t when preheating is completed, close relay contacts 28 and 30 simultaneously. Then, a DC voltage VH obtained by full-wave rectification of the AC power source 24 is applied to the solenoid 14 by the diodes 20, 21, 22, and 23, and the needle 12 slides with a strong force to open the nozzle hole 11. Also, t,
The timer w1129 started at time t opens the relay contact 28 at time t, so tt
The voltage applied to the solenoid 14 from the point in time is stepped down from the AC power supply 24 by the transformer 25,
A full-wave rectified DC voltage VL is applied at 3, 26, and 27.

In other words, the solenoid 14 requires strong force because
This is until the movable piece 13 is attracted against the coil spring 15 and the needle 12 is moved to open the nozzle hole 11. After that, it is sufficient to maintain this suction state. By reducing the power consumption from H to '/L, excess power consumption is prevented by +1-, and at the same time, the heat generation of the solenoid 14 itself is reduced to reduce the cost by downsizing the solenoid 14.

To terminate combustion and extinguish the fire, open the relay contact 30 and the solenoid 14 will be de-energized (at the time of ts).
The movable body 13 is returned to its original position by the pressing force of the coil spring 15, and the nozzle hole 11 is closed by the needle 12.

[Problem to be solved by the invention]

However, the conventional solenoid control circuit described above is not suitable for instantaneous power outages that occur due to accidents such as lightning strikes in the power transmission system. When a short voltage drop occurs in the AC power supply 24 at the time of starting a large load, the suction state cannot be maintained when the voltage applied to the solenoid 14 is VL, and the 1iJId1 body 13 separates.
The nozzle hole 11 is blocked by the needle 12.

After that, even if the AC power supply 24 is restored, since the voltage applied to the solenoid 14 is VL, the movable body 13 cannot be attracted against the coil spring 15, and the nozzle hole 11
W3 remains blocked and the fire is extinguished.

Further, in such a state, there is a problem that the movable body 13 generates a chattering sound due to the vibration 17.

In order to strengthen resistance to momentary power outages and voltage drops,
There is a method of increasing the voltage VL or inserting a capacitor with a large capacity in parallel with the solenoid 14, but this increases power consumption and requires a larger solenoid 14 or a capacitor with a larger shape. Cost increases were unavoidable.

This invention was made to solve the above-mentioned problems, and it improves the solenoid's resistance to instantaneous power outages and voltage drops without significantly increasing costs, and prevents malfunctions such as abnormal extinguishing during combustion. The purpose of the present invention is to obtain a control device for a vaporization type combustion machine that reduces the amount of combustor.

[Means to solve the problem]

A control device for a vaporization combustion machine according to the present invention includes an instantaneous voltage drop detection section that detects an instantaneous voltage drop in a solenoid control circuit, and the instantaneous voltage drop detection section detects an instantaneous voltage drop within a predetermined range during solenoid suction. When detected, a high voltage is applied to the solenoid for a short period of time to create a strong suction.

[Effect]

In this invention, even if the solenoid becomes unable to attract and detaches due to an instantaneous voltage drop during combustion in a vaporizing combustion machine, a high voltage is applied to the instantaneous solenoid where the voltage returns to I, and the combustion continues because the solenoid cooperates to attract the solenoid. can do.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a circuit diagram showing an embodiment of a control device for a vaporizing combustion machine according to the present invention.

In the figure, 31 is a power transformer that steps down the AC power supply 24, 32 is a diode bridge that rectifies the secondary voltage, 33 and 34 are diodes and electrolytic capacitors that smooth the full-wave rectified voltage, and 35 is a microcomputer 36 (
A three-terminal regulator 37 that receives a constant voltage M source for a microcomputer (hereinafter referred to as a microcomputer) stops the operation of the microcomputer 36 when the input voltage of the three-terminal regulator 35 becomes less than a predetermined voltage required for the operation of the microcomputer 36. Initial reset circuit for 38, 39.40 is AC amount i! iL2
Resistor and electrolytic capacitor to monitor voltage fluctuations in 4.
Reference numeral 1 designates an instantaneous voltage drop detection unit that compares this voltage value with a reference voltage value to detect a voltage drop in the AC power supply 24, and its output is connected to an interrupt input (INT terminal) of the microcomputer 36.

A relay coil 28b is connected to the output of the microcomputer 36.

30b is connected, and the diode 20 is connected as in the conventional example.
, 21, 22, 23, 2E3, 2F, transformer 25. Operates a solenoid control circuit constituted by relay contacts 28,30.

Although a combustion control circuit and other circuits are connected to the microcomputer 36, they are not shown here and their explanation will be omitted.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 2 and 3.

First, when preheating is completed at time t1 (step 42),
The output of the microcomputer 36 is 0. ．． 0. is output, the relay contacts 28 and 30 turn on (step 43), and the solenoid 14
A voltage VH is applied to the needle 12, and the needle 12 slides with a strong force to open the nozzle hole 11.

At time t8 (step 44), the relay contact 28 is turned off (step 45), and when the voltage applied to the solenoid 14 reaches VL, only the suction state is maintained.

When the nozzle hole 11 opens, combustion starts, and the microcomputer 3
6 enters the combustion state (step 46).

In this state, for example, at time L3, an instantaneous voltage drop in the AC power supply 24 occurs, and when the voltage applied to the solenoid 14 drops, the movable body 13 leaves the suction state. This voltage drop is detected by the instantaneous voltage drop detection section 41,
The signal is sent as a signal to the INT input of the microcomputer 3B (step 47).

When the microcomputer 3B receives the INT input, it performs program interrupt processing and immediately turns on the relay contact 28 (step 48). When the relay contact 28 is turned on, the voltage applied to the solenoid 14 increases, and when the AC power supply returns to the original voltage, the voltage reaches VH, and the movable body 13, which was about to leave the suction state, is strongly attracted again. , nozzle hole 11
The combustion state continues without being blocked.

At time t, the relay contact 28 is turned off (step 49.
50) Return to combustion state control again.

In addition, when the nozzle hole 11 is momentarily blocked due to such an instantaneous voltage drop and the fire is extinguished, combustion can be continued by turning on the relay contact 28 and simultaneously activating the ignition device 9 to reignite the fire. . If the voltage drop is relatively long (for example, 100 [ff1S]), the constant voltage to the microcomputer 3B will also drop, and there is a risk that the program of the microcomputer 36 will run out of control. Therefore, the initial reset circuit 37 resets the microcomputer 36. to stop the operation of the microcomputer 36 and extinguish the fire (step 51.5).
2).

FIG. 4 shows the relationship between the initial reset operating range of the microcomputer 36 and the operating range of the instantaneous voltage drop detection unit 41, with the horizontal axis representing the voltage [V] of the AC TA source 24 and the horizontal axis representing the voltage drop time (cns). It is expressed by taking The value on the vertical axis when the voltage is Ov represents the power outage time.

In the case of this example, the power outage time is 10 to 100 [mS
), the combustion continues due to the operation of the instantaneous voltage drop detection unit 41, but when the voltage exceeds 100100 (100100), the initial reset is activated and the fire is extinguished.The instantaneous voltage drop detection unit 4
The operation area No. 1 is an area where, in the conventional example, the movable body 13 could not be held, the nozzle hole 11 was blocked, and the fire was extinguished.

In the above embodiment, the nozzle hole 11 is opened when the solenoid 14 is energized, but the nozzle hole 11 may be closed when the solenoid 14 is energized. With such a configuration, the solenoid 14 is
However, even if an instantaneous voltage drop occurs, the nozzle hole 11 will not open due to detachment of the movable body 13.
There is no possibility that residual rice gas inside will leak and cause odor.

〔Effect of the invention〕

As described above, according to the present invention, the present invention includes an instantaneous voltage drop detection section that detects an instantaneous voltage drop in the solenoid control circuit,
When an instantaneous voltage drop within a predetermined range is detected during solenoid suction, a high voltage is applied to the solenoid for a short period of time to ensure strong suction. The present invention has the effect of providing a control device for a vaporizing combustion machine that has improved rigidity and reduces malfunctions such as abnormal extinguishing during combustion.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a control device for a vaporizing combustion machine showing an embodiment of the present invention, Fig. 2 is a flowchart showing its operation, Fig. 3 is an explanatory diagram showing the voltage applied to the solenoid, and Fig. 4
The figure is an explanatory diagram of the operating area of the instantaneous voltage drop detection section, Figure 5 is a cross-sectional view of this type of vaporization type combustor, Figure 6 is a conventional solenoid control circuit diagram, and Figure 7 is the voltage applied to the solenoid in that circuit. It is an explanatory diagram showing voltage. In the figure, 4 is a vaporizer, 11 is a nozzle hole, 12 is a needle,
14 is a solenoid, 9 is an ignition device, 24 is an AC power supply, 3
B is a microcomputer, 37 is an initial reset circuit, and 41 is an instantaneous voltage drop detection section. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 others)

Claims (1)

[Claims] In a vaporization type combustion machine in which liquid fuel is vaporized in a vaporizer, the vaporized gas is ejected through a nozzle hole, ignited by an ignition device, and combusted, a solenoid that operates a needle that opens and closes the nozzle hole; At the initial stage of suction, a high voltage is applied to this solenoid to suction with strong force.
It is equipped with a solenoid control circuit that reduces the voltage to a force that can be maintained after suction, and an instantaneous voltage drop detection section that detects an instantaneous voltage drop in the power supply section of this solenoid control circuit. 1. A control device for a vaporizing combustion machine, characterized in that when a drop detection section detects an instantaneous voltage drop within a predetermined range, the high voltage is applied to a solenoid to re-suction with a strong force.