JPH06147474A - Method for controlling evaporation type burner - Google Patents

Abstract

PURPOSE:To optimally control long time cleaning to be conducted suitably at the time of normal fire extinguishing in the case of cleaning an evaporator. CONSTITUTION:A method for controlling an evaporation type burner comprises the steps of interposing a reserving tank 11 at a fuel supply passage 4 between a fuel supply pump 3 and an evaporator 2, providing a switching valve 12 at a fuel return tube 10 from the tank 11, opening the valve 12, deenergizing the pump 3 at the time of fire extinguishing, opening the valve 12 and energizing the pump 3 at the time of cleaning the evaporator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a new type of vaporization type combustion apparatus in which a reserve tank for temporarily holding fuel is provided in a fuel supply path to a vaporizer.

[0002]

2. Description of the Related Art As a vaporization type combustion device capable of cleaning the inside of a carburetor at the time of extinguishing a fire or in a timely manner, a fuel return pipe is connected between a fuel supply passage from the fuel reservoir to the carburetor and the fuel reservoir. It is known that the fuel return pipe is provided with a return pump composed of an electromagnetic pump. However, in this vaporization type combustion apparatus, there is a problem that a power facility dedicated to cleaning is required and its control becomes complicated.

In order to deal with this problem, although an application has not yet been published, the applicant previously proposed a device as shown in FIG. 5 (Japanese Patent Application No. 4-50169).
In such a vaporization type combustion device, the fuel supply passage 24
Is branched in the middle and connected to the fuel tank 21, and an opening / closing valve 33 is provided in the branch passage 32 (fuel return pipe).
At the time of cleaning the carburetor 22, the fuel supply pump 23 is operated or the operation is continued, and the opening / closing valve 33 is opened. The liquid fuel in the fuel tank 21 is sent to the fuel supply passage 24 by the fuel supply pump 23.
Since the resistance of No. 2 is large, especially the resistance of the nozzle 27, the fed fuel does not go to the carburetor 22, but flows to the branch passage 32 (fuel return pipe) having a small resistance and returns to the inside of the fuel tank 21. Be done. At this time, the branch passage 32 (fuel return pipe)
The ejector effect occurs at the branch portion of the fuel tank 21, the fuel supply pump 23, the fuel supply passage 24, the branch passage 32 (fuel return pipe), and the fuel circulating in the fuel tank 21.
Air is sucked in from the vaporizer 22 side. As a result, the residual gas in the vaporizer 22 is drawn together with the air from the outside air, and the vaporizer 22 is cleaned.

[0004]

However, in the above-mentioned proposal, the negative pressure in the fuel supply passage cannot be made sufficiently large. For this reason, when shifting from the normal combustion process to the extinguishing process, if the vaporized gas is full in the vaporizer,
There was a risk that the residual gas in the vaporizer could not be quickly sucked in and the fire could not be extinguished immediately after the start of the fire extinguishing process.

The present invention relates to an improvement of the above-mentioned proposal, and an object of the present invention is to properly and surely perform cleaning inside the carburetor at the time of extinguishing the fire or cleaning the carburetor at appropriate times (for example, seasonally). And

[0006]

According to the vaporization type combustion apparatus of the present invention for this purpose, the liquid fuel in the main fuel reservoir is vaporized by a fuel supply pump through a reserve tank for temporarily holding the fuel. The fuel vaporized by the vaporizer is fed to the burner through the nozzle and burned by the burner, and the bottom of the reserve tank and the main fuel reservoir are connected by the fuel return passage, In a method for controlling a vaporization type combustion device having an on-off valve in a return path, the on-off valve is opened when the fire is extinguished, the fuel supply pump is turned off, and when the carburetor is cleaned, the on-off valve is opened and the fuel supply pump is opened. Consists of how to turn on.

[0007]

In the control method of the vaporization type combustion device as described above, when the fire is extinguished, the fuel accumulated in the reserve tank is turned off by opening the on-off valve by turning off the fuel supply pump.
It is returned to the main fuel reservoir via the fuel return pipe. At this time, a large negative pressure is generated in the fuel supply path, and the residual gas in the carburetor is strongly and quickly sucked in, so that the fire is extinguished immediately and surely immediately after the start of the fire extinguishing process, and it is sufficient for extinguishing A good cleaning effect can be obtained.

During carburetor cleaning, which is performed in a timely manner, the fuel supply pump is operated and the on-off valve is opened. Therefore, the liquid fuel in the main fuel reservoir is circulated to the main fuel reservoir → fuel supply pump → fuel supply path → reserve tank → fuel return pipe → main fuel reservoir, and due to the ejector effect at the reserve tank part, Air is sucked from the vaporizer side, and the vaporizer is cleaned. When cleaning the vaporizer, it is not necessary to extinguish a large amount of air instantaneously because there is no need to extinguish the fire, but the above operation can be continued for a long time, and a large amount of residue accumulates in the vaporizer. Even if there is, a sufficient cleaning effect can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vaporization type combustion apparatus for carrying out a control method according to an embodiment of the present invention.
In the figure, reference numeral 1 denotes a main fuel reservoir that stores liquid fuel, and the main fuel reservoir 1 is a constant oil level device in which an oil level A is constantly adjusted. 2 is a vaporizer for vaporizing liquid fuel, 3 is an electromagnetic pump, is a fuel supply pump for supplying fuel from the main fuel reservoir 1 to the vaporizer 2, 4 is a fuel supply pipe, 5 is a burner for burning vaporized fuel Are shown respectively. The vaporizer 2 vaporizes the liquid fuel using the heater 6 and supplies the vaporized fuel from the nozzle 7 to the burner 5. A thermistor 8 detects the temperature of the vaporizer 2. Reference numeral 9 indicates an ignition heater for igniting vaporized fuel in the burner 5, and reference numeral 15 indicates a flame sensor for detecting the presence or absence of a flame in the burner 5.

Reference numeral 11 denotes a reserve tank for temporarily holding the supplied fuel, to which a fuel supply pipe 4 (fuel supply passage) on the fuel supply pump 3 side is connected, and a fuel supply pipe 4 on the carburetor 2 side is connected to the top. Has been done. The reserve tank 11 is further connected to the bottom of the reserve fuel tank 11 by the fuel return pipe 10 (fuel return passage) and the main fuel reservoir 1. The mutual positional relationship is such that the level of the bottom of the reserve tank 11 is set higher than the oil level A of the main fuel reservoir 1. Further, the fuel return pipe 10 is provided with an opening / closing valve 12 which is an electromagnetic valve for turning on / off the flow of fuel by opening / closing the pipe line.

Reference numeral 13 denotes a control device, and the control device 1
3 sends an energization control signal to the ignition heater 9 and receives a signal from the burner 5 indicating the presence or absence of flame from the flame sensor 15. A temperature detection signal of the vaporizer 2 is sent from the vaporizer 2 from the thermistor 8. Further, the control device 13 controls heating, opening / closing, and driving of the heater 6, the opening / closing valve 12, and the fuel supply pump 3 of the carburetor 2 via the driving device 14.

The control method of the present invention is carried out as follows using the embodiment apparatus configured as described above. At the time of ignition, as shown in FIG. 2, when the ignition mode is started (step S1), the temperature of the carburetor 2 is started to be controlled by the heater 6 to the control temperature at the time of normal combustion (step S2).
Subsequently, in step S2, the completion of temperature control of the carburetor 2 is confirmed, and it is determined whether or not the ignition signal is transmitted to the next step, that is, the ignition preparation OK is appropriate (step S3).

It usually takes about x minutes (for example, 3 minutes) from the start of the ignition mode until it is determined that the ignition preparation is appropriate, that is, from step S1 to step S3. Therefore, in step S3, when it is determined that the ignition preparation is not performed, it is determined whether x minutes have elapsed, and when it is determined that the elapsed time is elapsed, it is determined that some abnormality is present and error processing is performed. (Step S5).

In step S4, within x minutes (for example, 3
Min), it is again determined in step S3 whether the ignition preparation is appropriate, and if it is determined that the ignition preparation is appropriate, the ignition heater 9 is turned on (step S6).

When the ignition heater 9 is turned on in step S6, it is determined whether or not y seconds (for example, 20 seconds) have elapsed (step S7). If not, the mode is repeated. When the time has elapsed, the on-off valve 12 is closed and the fuel supply pump 3 is operated (step S8),
Fuel is stored in the reserve tank 11.

After the start of the operation of step S8, the fuel filled in the reserve tank 11 is fed to the carburetor 2 and vaporized in the carburetor 2 within a time of usually about z minutes (for example, 5 minutes). , Is fed to the burner 5 through the nozzle 7, is ignited by the ignition heater 9, emits flames, and starts combustion.

Therefore, it is determined whether or not z minutes have elapsed since the start of step S8 (step S9). If not, the flame sensor 15 detects the presence or absence of flame.
(Step 10) If the flame is not detected, the modes of Step 9 to Step 10 are repeated.

However, if it is determined in step S9 that z minutes (for example, 5 minutes) have elapsed, it is determined that some abnormality has occurred and error processing is performed (step S13).

When the flame is detected in step S10, the ignition heater 9 is turned off (step S11), and the process proceeds to the normal combustion process (step S12).

At the time of extinguishing the fire, as shown in FIG. 3, when the extinguishing mode is started (step S14), the carburetor 2 is temperature-controlled by the heater 6 to the idle temperature (higher than the control temperature during normal combustion). Controlled (step S1
5). By this operation, the residue in the vaporizer 2 is melted or evaporated, and is easily removed.

Next, the fuel supply pump 3 is turned off and the on-off valve 1
When 2 is opened (step S16), it is determined whether or not m seconds (for example, 5 seconds) have elapsed (step S17), and if not elapsed, the mode is repeated.

By the control as described above, the fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity,
Along with that, air is sucked from the nozzle 7 of the carburetor 2 and drawn into the reserve tank 11 together with the gas in the carburetor 2, and the drawing of this air instantaneously extinguishes the fire, and the nozzle 7 and the carburetor. The inside of 2 is cleaned. Therefore, no special power equipment for cleaning is required.

In step S17, m seconds (for example, 5 seconds)
If it is determined that the time has elapsed, the presence or absence of flame is detected by the flame sensor 15 (step S18), extinguishing is confirmed, and if flame is detected, error processing is performed (step S19).

If the flame is not detected in step S18, it is determined whether or not a predetermined time x minutes (for example, 3 minutes) has elapsed after the detection (step S20). If not, the mode is repeated. When it is determined that the time has passed, the heater 6 is turned off (step S21), and this flow is ended (step S22).

During carburetor cleaning, which is performed in a timely manner, as shown in FIG. 4, when the carburetor cleaning mode is started (step S23), the heater 6 burns out the air (a temperature higher than the control temperature during normal combustion). )
Temperature control is performed (step S24). Then, in step S24, the completion of temperature control of the carburetor 2 is confirmed, and it is determined whether the ignition signal transmission to the next step is appropriate, that is, the ignition preparation OK is appropriate (step S25).

It is determined whether or not a normal required time x minutes (for example, 3 minutes) from the start of the carburetor cleaning mode to the time when it is determined that the ignition preparation is appropriate (step S26) has been performed. If it is determined that some or more has occurred, error processing is performed (step S27).

In step S26, x minutes (for example, 3
If it is determined that minutes have not elapsed, it is determined again in step S25 whether or not the ignition preparation is OK. If it is determined to be suitable, the ignition heater 9 is turned on (step S
28), it is determined whether or not a fixed time y seconds (for example, 20 seconds) has elapsed (step S29). If not, the mode is repeated, and if it is determined that the time has elapsed, the fuel is The supply pump 3 is turned on and the on-off valve 12 is opened (step S30).

In step S30, when the fuel supply pump 3 is turned on and the opening / closing valve 12 is opened, the liquid fuel is the main fuel reservoir 1 → fuel supply pump 3 → fuel supply passage 4
-> Reserve tank 11-> Fuel return pipe 10-> Main fuel reservoir 1 is circulated in the order of the system. As a result, an ejector effect is produced at the branch portion of the fuel supply passage 4 on the carburetor 2 side, that is, the reserve tank 11 portion, so that the carburetor 2 side moves from the carburetor 2 side.
The residual gas inside is sucked in and the inside of the vaporizer 2 is cleaned.

When the liquid fuel is circulated as described above,
If the liquid fuel erroneously flows into the carburetor 2 side, there is a risk that it may be vaporized in the carburetor 2 and sent to the burner 5 via the nozzle 7. Therefore, in step S28, the ignition heater 9 is turned on in advance, and if the fuel should flow into the carburetor 2 side, the fuel is vaporized and the vaporized fuel is burned. Therefore, the flame sensor 15
When the flame is detected by (step S31), a safety measure is taken to perform error processing (step S32).

If no flame is detected by the flame sensor 15 in step S31, the liquid fuel normally circulates in the system. It is determined whether or not n hours (for example, 1 hour) have elapsed from the start of step S30 (step S33). If it has not elapsed, this mode is repeated, and if it is determined that it has elapsed, the fuel supply pump 3 Turning off, turning off the ignition heater 9 and turning off the heating heater 6 (step S34), and ending this flow (step S3).
5).

[0031]

As described above, according to the control method of the vaporization type combustion device of the present invention, the on-off valve is opened and the fuel supply pump is turned off to extinguish the fuel from the reserve tank 11 to the main fuel reservoir 1 at a time. By dropping, the fire can be extinguished reliably and instantly, and a sufficient cleaning effect can be obtained when the fire is extinguished. During cleaning of the carburetor, the on-off valve 12 is opened and the fuel supply pump 3
By turning on to enable cleaning for a long time, a sufficient cleaning effect can be obtained even when a large amount of residue is accumulated in the vaporizer.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vaporization type combustion device for carrying out a control method according to an embodiment of the present invention.

FIG. 2 is a flowchart relating to one control during ignition of the device of FIG.

FIG. 3 is a flow chart relating to one control during fire extinguishing of the device of FIG.

4 is a flowchart relating to one control during cleaning of the vaporizer of the apparatus of FIG.

FIG. 5 is a schematic configuration diagram of a vaporization combustion device according to the applicant's previous proposal.

[Explanation of symbols]

 1 Main Fuel Reservoir 2 Vaporizer 3 Fuel Supply Pump 4 Fuel Supply Channel (Fuel Supply Pipe) 5 Burner 6 Vaporizer Heater 7 Nozzle 8 Thermistor 9 Ignition Heater 10 Fuel Return Channel (Fuel Return Pipe) 11 Reserve Tank 12 Open / Close Valve 13 Control device 14 Drive device 15 Flame sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location F23N 1/00 117 Z 5/24 C (72) Inventor Yasushi Saito 20 Nobuto-cho, Isesaki-shi, Gunma Prefecture Sanden Stock Company

Claims (2)

[Claims] 1. A liquid fuel in a main fuel reservoir is fed by a fuel supply pump to a vaporizer through a reserve tank for temporarily holding the fuel, and the fuel vaporized by the vaporizer is supplied to a nozzle. In the method for controlling the vaporization type combustion device, the fuel is fed to the burner via the burner and burned by the burner, the bottom of the reserve tank and the main fuel reservoir are connected by a fuel return path, and an opening / closing valve is provided in the fuel return path. A method for controlling a vaporization type combustion device, wherein the on-off valve is opened when the fire is extinguished, the fuel supply pump is turned off, and the on-off valve is opened and the fuel supply pump is turned on when the carburetor is cleaned. 2. The vaporization system according to claim 1, wherein, in the control method for extinguishing a fire, error processing is performed when flame is detected in the burner portion after a lapse of a predetermined time after the opening / closing valve is opened and the fuel supply pump is turned off. Combustion device control method.