JPS61159030A - Combustion control device - Google Patents

Abstract

PURPOSE:To effect combustion control accurately for every abnormal causes and improved safety and durability by a method wherein the amount of oil transfer is increased up to the predetermined amount in case the detecting value of flame current is reduced and the cause of the reduction is understood from the observation result of the flame current value thereafter. CONSTITUTION:In case the flame current value arrives at a lower value than a flashing flame current value, the control circuit 26 sends an increasing indication of the amount of oil transfer to the amount of oil transfer control circuit 23 due to the judgement of generation for the abnormal combustion, the amount of oil transfer for an evaporator is increased by an electromagnetic pump 12. The control circuit 26 detects the flame current value at the period of time passed the predetermined time from the period of time exceeding the said current value again after the flame current value once became to the flashing flame current value or under. When it is the judgement flame current value or above, the cause thereof is understood as a clogging of tar and the amount of oil transfer control circuit 23 is indicated for the predetermined amount of oil transfer set so as to overcome against the tar clogging. In case the flame current value becomes the judgement flame current value or under and drops in accordance with a time, the cause thereof is understood as the drop of the oxygen temperature while an alarm indication for the ventilation of the room may be displayed to an indicator 28 by the control circuit 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a combustion control mixer for a combustion device using a carburetor.

[Technical background of the invention and its problems]

In recent years, so-called oil fan heaters, which vaporize kerosene in a vaporizer and eject it into a combustion chamber for combustion, have been widely used.

This type of combustion device has the advantage of being compact, easy to carry, excellent in operability, and cheaper than a forced intake/exhaust type.

However, since this type of device uses a vaporizer to vaporize kerosene, if degraded or defective kerosene is used, its non-volatile components become tar and remain in the vaporizer pipe, causing the vaporizer pipe to deteriorate. This is a so-called open type system, which mixes with air drawn in due to tar clogging and poor combustion, and exhausts the mixture to the outside of the device, thereby performing blank space heating. There is a risk that the temperature may drop and cause incomplete combustion.

[Purpose of the invention]

The present invention provides a combustion control device that can reliably detect combustion abnormalities, determine the cause of the abnormality, and perform appropriate combustion control for each cause of the abnormality, thereby improving safety and durability. The purpose is to provide

[Summary of the invention]

In order to achieve the above object, the present invention detects the flame current during combustion, and when the detected value falls below a predetermined level, the amount of oil sent to the carburetor by the oil feeding means is set to a predetermined amount. The flame current value after this increase in the oil supply amount is monitored, the cause of the decrease in the flame current value is determined from the monitoring result, and predetermined combustion control is performed according to the determination result. This is how it was done.

[Embodiments of the invention]

The figure is for explaining one embodiment of the present invention.
The figure is a sectional view of the combustion device main body. In the figure, reference numeral 1) is an oil receiving tray, and above the oil receiving tray 1), an electromagnetic pump 12, a vaporizer 13, a spraying section 14, and a burner section 15 are arranged in order from the bottom. The vaporizer 13 consists of a vaporization pipe 13a and a vaporization heater 13b, and an electromagnetic pump 1
2, the kerosene supplied from the oil receiving tray 1) via the oil pipe 12a is transferred to the vaporizing heater 1 in the vaporizing pipe 13a.
3k) to gasify it. Note that this vaporizer 13 is provided with a vaporizer thermistor 13c for detecting the temperature of the vaporizer 13.

The spray section 14 includes a jet nozzle section 14a and a spray mixing section 14b.
The vaporized gas sent from the vaporizer 13 is sprayed into the spray mixing section 1 through the needle valve 14C at the jet nozzle section 14a.
4b, and in this spray mixing part 14b, primary air 14d
and is supplied to the burner section 15. The burner part 15 is
The combustion gas 14e supplied from the spray mixing section 14b is ejected from the flame hole surface 15a, and the combustion gas 14e is ignited by a spark plug 15b and combusted. Reference numeral 16 designates a solenoid valve for handling gas, and when extinguishing a fire, this solenoid valve 16 discharges the vaporized gas in the vaporization pipe 13a to the oil pan 1) via the gas vent pipes 16a and 16b.

On the other hand, FIG. 2 shows the circuit configuration of the combustion control device. This device is operated by a commercial power supply, and a series circuit of a switch circuit 21 having a triac and a vaporization heater 13b is connected between the commercial power supply terminals (AClooV), a convection blower 22, and an electromagnetic A parallel circuit consisting of an oil supply amount control circuit 23 for controlling the opening/closing amount of the pump 12, a solenoid valve 16 for degassing, and an ignition transformer 24 of the spark plug 15b is connected in series through a relay contact 25a. Also, between the above commercial power terminals,
A control circuit 26 is connected. This control circuit 26 is
A microcomputer is provided as the main control unit, and this microcomputer includes a carburetor thermistor 13C1, a room temperature thermistor 27, a display 28 for displaying combustion status and alarms, a relay 25, and an operation switch 29, each connected to an interface circuit (not shown). connected via.

Further, a flame current detection circuit is provided within the control circuit 26. FIG. 3 shows the circuit configuration. A flame detector 3.1 is arranged in the flame of the burner section 15 so that a pair of electrodes are located at the outer flame and the inner flame, respectively. An alternating current voltage is applied from a transformer 32 between the electrodes of the detector 3). By applying this alternating current voltage, the rectifying effect of the flame causes the direct current that flows in accordance with the strength of the flame to be smoothed by a smoothing circuit 33 and then introduced into the microcomputer.

Next, the operation of the apparatus configured as above will be explained.

First, when the operation switch 29 is turned on, a call signal is supplied from the control circuit 26 to the switch circuit 21 and the switch circuit 21 becomes conductive.
3b, and preheating of the vaporizer 13 is started. The temperature of this vaporizer 13 is detected by a vaporizer thermistor 13G, and when this temperature reaches a predetermined temperature, the relay 25 is energized by the control circuit 26 and its relay contact 25a is closed. Therefore, the blower 22, the oil feed amount control circuit 23, the solenoid valve 16, and the ignition transformer 24 are energized, and the electromagnetic pump 12 starts feeding oil. At this time, the oil rich amount of the electromagnetic pump 12 is set by the oil feed amount control circuit 23 according to instructions from the control circuit 26. In this case, the setting is set to the mode corresponding to normal combustion. Then, when kerosene is supplied to the vaporizer 13 by the electromagnetic pump 12,
This kerosene is heated and vaporized in the vaporizer pipe 13a,
It is sent to the jet nozzle section 14a. At this time, the needle valve 14C of the ejection nozzle portion 14a moves back according to the operating position of the room temperature setting knob, thereby forming an ejection nozzle.

Therefore, the vaporized gas sent from the vaporizer 13 is ejected from this ejection nozzle to the spray mixing section 14b, where it is mixed with primary air and sent to the burner section 15. Then, the burner section is ignited by the spark plug 15b to start combustion.

On the other hand, when this combustion is started, the control circuit 26 inputs the detection output of the flame detection circuit to the microcomputer and starts monitoring the flame current value.

Now, in this state, for example, if tar is accumulated in the vaporizer pipe 13a due to the use of degraded or defective kerosene, and tar clogging occurs in the vaporizer pipe 13a, or if indoor ventilation is poor and the oxygen concentration decreases, a combustion state may occur. An abnormality occurs and the flame current value decreases.

Then, when this flame current value decreases below a preset flashing flame current value IA as shown in FIG.
1) The circuit 26 determines that a combustion abnormality has occurred at that point and sends an instruction to increase the amount of oil fed to the oil feed amount control circuit 23, thereby increasing the amount of oil fed to the carburetor 13 by the electromagnetic pump 12. let

Here, for example, if the cause of the combustion abnormality is due to tar clogging, the internal pressure of the carburetor 13 will overcome the load due to the tar clogging due to the increase in the amount of oil fed, and the vaporized gas will be sent to the jet nozzle portion 14a. The amount of
As a result, the combustion state is restored and the flame current value is 41gAl.
As shown in , the judged flame current value increases for more than one day. Therefore, the control circuit 26 controls the flame current value I once the flame current value blinks.
At the time (tl) when a predetermined time T2 has elapsed from the time when the current value becomes less than ^ and exceeds the same current value IA again, the flame current value after the above-mentioned increase in the oil supply amount is detected, and if this flame current value exceeds the above-mentioned judged flame current value IB. At some point, it is determined that the cause of the combustion abnormality is tar or clogging, and in response to the tar clogging, a predetermined amount of oil to be fed is instructed to the oil feeding amount control circuit 23, and the electromagnetic pump 12 is operated. Let me. Therefore, from now on, burner section 1
5, the normal combustion state continues as shown, for example, in FIG. 4 A2. Note that at this time, the control circuit 26 controls the combustion
The display 28 is made to display that combustion is continuing by changing the conditions. Therefore, the user should see this! By checking the display format of 128, the current combustion state can be determined.

On the other hand, if the cause of the combustion abnormality is due to a decrease in the oxygen concentration in the room, the combustion condition will not be resolved even if the above-mentioned increase in the oil supply amount is performed, but rather the combustion state will tend to lift due to lack of oxygen. Since the lift state of the flame is roughly promoted, the flame current value is determined to be 1 as shown in FIG.
a or less, and decreases over time. Therefore, the control circuit 26 compares the flame current value with the determined flame current value ■8 at the time to, and if the determined flame current value is less than 18, the control circuit 26 determines that the cause of the combustion abnormality at this time is a decrease in oxygen concentration. I judge that there is. Then, the control circuit 26 displays an alarm on the display 28 at this point in time to cause blank ventilation to be performed. When the user notices this alarm and ventilates by opening the window, etc., and this eliminates the oxygen-deficient state in the air, the combustion state of the burner section 15 changes as shown in Fig. 4-8.
2, it will return to normal state.

On the other hand, if the user does not notice the warning display and leaves it as it is, the flame will generally disappear soon as the oil supply amount increases, as shown in Fig. 483, but the control circuit 26 will , When a certain period of time T3 has elapsed from the judgment time t (1) of the flame current value, for example, the amount of oil sent to the carburetor 13 is further increased instantaneously to blow out the flame in the burner section 15, thereby reducing the flame. is forcibly extinguished as shown in Fig. 484. Therefore, it is reliably prevented that combustion continues indefinitely in a dangerous state of oxygen deficiency.

In this example, the occurrence of combustion abnormality is detected from the decrease in flame current, and after this detection, the amount of oil sent to the carburetor 13 is increased and the detected value of the flame current is then monitored. By doing so, it is possible to determine not only the occurrence of combustion abnormality but also the cause thereof, thereby making it possible to perform optimal combustion ll1llWJ for each cause of combustion abnormality. As a result, for example, the cause of combustion abnormality may be the carburetor 1.
In the case of tar clogging in No. 3, it is possible to reduce the problem that combustion stops every time tar clogging occurs, and durability can be improved. In addition, since the combustion control status is displayed on the display 28, it is possible to notify the user of a warning such as oxygen deficiency, which allows the user to quickly notice a dangerous situation and take prompt action. can be made to do so. Moreover, in consideration of the possibility that the alarm may not be noticed even if the alarm is issued, we monitor the time after the alarm is displayed and forcibly extinguish the fire after a certain period of time has elapsed, ensuring that dangerous situations are avoided. can do. Therefore, a combustion device with extremely high safety can be provided.

However, the present invention is not limited to the above embodiments.

For example, as a display form for alarms, etc., other than visual display using a liquid crystal display or the like, a different display form such as the generation of a sound may be used in combination.

In addition, the control procedure, control contents, etc. of the means for determining the cause of the abnormality and the combustion control means may be modified in various ways without departing from the gist of the present invention.

〔Effect of the invention〕

As detailed above, according to the present invention, flame 1 during combustion! When the flow is detected and the detected value falls below a preset level, the amount of oil sent to the vaporizer by the oil feeding means is increased to a predetermined amount, and the flame current value after this increase in the amount of oil sent is Monitor and determine the cause of the decrease in the flame current value from the monitoring results,
By performing predetermined combustion control according to the result of this judgment, combustion abnormalities can be detected reliably, and the number of abnormalities can also be determined, so that appropriate control can be applied to each cause of the abnormality. It is possible to provide a combustion control device that can perform accurate combustion control and improve safety and durability.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention. Fig. 1 is a sectional view showing the structure of the combustion device main body, Fig. 12 is a circuit diagram showing the structure of the combustion control device, and Fig. 3 is a flame detection FIG. 4, which is a circuit configuration diagram of the circuit, is a diagram showing changes in flame current for use in explaining the operation of the combustion control device. 1)... Oil pan, 12... Electromagnetic pump for oil feeding, 1
2a...oil pipe, 13...carburizer, 13a...
・Carburetor pipe, 13b... vaporization heater, 13c...
- Carburetor thermistor, 14... spray part, 14a...
Spray nozzle part, 14b... Spray mixing part, 14C...
Needle valve, 14d...-next air, 15... Burner part, 15a... Flame hole part, 15b... Spark plug, 1
6... Solenoid valve for degassing, 21... Switch circuit, 22... Air blower for convection, 23... Oil supply amount control circuit, 24... Ignition transformer, 5... Relay , 25
a... Relay contact, 26...! II, t1) circuit, 27'... air temperature thermistor, 28... indicator, 2
9... Operation switch, 3)... Flame current detector, 32
...Transformer, 33...Smoothing circuit.

Claims (5)

[Claims] (1) In a combustion control device for a combustion device that vaporizes kerosene in a vaporizer and injects the vaporized gas into a combustion chamber for combustion,
an oil supply means for supplying oil to the vaporizer and capable of varying the amount of oil supply; a flame current detection means for detecting flame current during combustion; and a flame current value detected by the flame current detection means. An oil feed control means for increasing the oil feed amount of the oil feed means to a predetermined amount when the oil feed amount falls below a preset predetermined level, and a flame current value after the oil feed amount is increased by the oil feed control means. It is equipped with an abnormality cause determining means for monitoring and determining the cause of the decrease in flame current from the monitoring result, and a combustion control means for performing predetermined combustion control according to the determination result of the abnormality cause determining means. A combustion control device featuring: (2) The abnormality cause determination means detects a flame current value at a certain time point after the oil supply amount is increased by the oil supply control means, and this detected value is lower than a level for detecting a decrease in the flame current. When the level is higher than a predetermined level, it is determined that there is abnormal combustion due to tar clogging in the carburetor, and when it is lower than the predetermined level, it is determined that incomplete combustion is due to lack of oxygen. ) Combustion control device described in item 2. (3) When the abnormal cause determining means determines that the carburetor is clogged with tar, the combustion control means continues combustion by supplying a larger amount of oil than during normal combustion, and when it is determined that there is oxygen deficiency. The combustion control device according to claim (2), which extinguishes a fire. (4) The combustion control device according to claim (1), wherein the abnormality cause determination means has means for displaying the determination result of the abnormality cause by cause. (5) The combustion control device according to claim (1), wherein the combustion control means has means for displaying the control state after combustion control.