JPH0682031A - Method of controlling carburation type burning apparatus - Google Patents

Abstract

PURPOSE:To carry out the cleaning of a vaporizer accurately in timely and seasonal cleaning thereof in a vaporizing burning apparatus with a reserve tank. CONSTITUTION:In a burning apparatus in which a reserve tank 11 is interposed in a fuel supply path 4 between a fuel supply pump 3 and a vaporizer 2 and a shutoff valve 12 is provided in a fuel return path 10 from the reserve tank 11, in the normal extinguishing operation, cleaning operation of the vaporizer 2 is performed only once by opening the shutoff valve 12. In the cleaning of the carburator, the operation or stoppage of the fuel supply pump 3 and the opening or closing of the shutoff valve 12 are repeated several times. This cleaning operation of the vaporizer 2 is repeated several times.

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]

Fuel supply from a fuel reservoir to a carburetor as a carburetion type combustion device capable of cleaning the inside of the carburetor at the time of extinguishing a fire or cleaning the carburetor in a timely manner (for example, seasonally) It is known that a fuel return pipe is connected to the middle of the passage with a fuel return pipe, and 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.

[0003] In order to deal with this problem, although the application has not been published yet, the applicant of the present invention temporarily holds fuel in the fuel supply path between the fuel supply pump and the carburetor. A vaporization type combustion apparatus has been proposed in which a reserve tank is interposed and a bottom portion of the reserve tank is connected to a main fuel reservoir by a fuel return path. In this device, the fuel in the reserve tank can be returned to the main fuel reservoir by gravity by opening the fuel return passage at the time of extinguishing the fire, and the carburetor can be cleaned by drawing air from the carburetor accordingly. . Therefore, the power equipment for cleaning as described above is unnecessary.

[0004]

However, in the above proposal, the fuel accumulated in the reserve tank is opened in the main fuel reservoir by opening the on-off valve even when the fire is extinguished, for example, when cleaning the carburetor which is performed seasonally. Since the same cleaning control was performed by performing the above-mentioned air drawing only once with the return, a large amount of residue adhered to the inside of the vaporizer,
At the time of cleaning in the case of accumulation, the residue may not be completely removed by the above-mentioned single cleaning operation.

The present invention relates to an improvement of the control method of the device previously proposed by the applicant of the present invention. In a vaporization type combustion device equipped with a reserve tank, the vaporization is usually performed at the time of fire extinguishing and, for example, seasonally. The purpose of the present invention is to separate the cleaning operation from the cleaning of the vaporizer so that the vaporizer can be more reliably cleaned during the cleaning of the vaporizer.

[0006]

A method for controlling a vaporization type combustion apparatus according to the present invention, which is directed to the above object, includes a reserve tank for temporarily holding liquid fuel in a main fuel reservoir by a fuel supply pump. 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 path. In the control method of the vaporization type combustion device, wherein an opening / closing valve is provided in the fuel return path, and the opening / closing valve is opened at the time of extinguishing the fire and cleaning the carburetor,
During normal fire extinguishing, the fuel is returned from the reserve tank to the main fuel reservoir only once by opening the on-off valve, and when cleaning the carburetor, fuel is supplied to the reserve tank by operating the fuel supply pump and reserve by opening the on-off valve. It comprises a method for controlling a vaporization type combustion device characterized in that the fuel is returned from the tank to the main fuel reservoir a plurality of times.

[0007]

In the control method of the vaporization type combustion apparatus as described above, when the fire is extinguished, the operation of the fuel supply pump is stopped, the on-off valve is opened, the fuel in the reserve tank is returned to the main fuel reservoir, and The cleaning operation described above is performed only once by drawing in air. Of course, at this time, the fire is extinguished at the same time.

[0008] When cleaning the carburetor in a timely or seasonal manner, a cleaning operation is performed after a relatively long time of use, so that a relatively large amount of residue may be attached and accumulated in the carburetor. . However, in the present invention, during this carburetor cleaning, fuel supply to the reserve tank (fuel replenishment) by operation of the fuel supply pump, and operation of returning the supplied fuel from the reserve tank to the main fuel reservoir by opening the on-off valve are performed. Since the cleaning is repeated a plurality of times, the air is drawn in for the above cleaning a plurality of times, the residue in the vaporizer is repeatedly removed, and the inside of the vaporizer is cleaned more reliably.

[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 is heated by the heater 6 to vaporize the liquid fuel and supply the vaporized fuel from the nozzle 7 to the burner 5. A thermistor 8 detects the temperature of the vaporizer 2.

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 portion of the reserve fuel tank 11 and the main fuel reservoir 1 by a fuel return pipe 10 (fuel return passage). 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 has an opening / closing valve 12 which is an electromagnetic valve that opens and closes the flow of fuel by opening and closing the pipe.
Is provided.

Reference numeral 13 denotes a control device, and the control device 1
A temperature detection signal of the carburetor 2 is sent from the thermistor 8 to 3. 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. Although not shown, a switch for performing a normal fire extinguishing operation (for example, a push button switch) and a switch for seasonal carburetor cleaning, for example, are provided separately,
It can be operated selectively.

The control method of the present invention is carried out as follows using the embodiment apparatus configured as described above. First, a basic operation of cleaning the carburetor 2 at the time of extinguishing a fire and cleaning the carburetor by providing the reserve tank 11 will be described. In other words, the on-off valve 12
When the is opened, the fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity, and air is sucked from the nozzle 7 of the carburetor 2 accordingly, and the gas in the carburetor 2 is reserved tank 11 side, The nozzle 7 and the inside of the carburetor 2 are cleaned by being drawn into the reserve tank 11. Since the cleaning of the carburetor 2 utilizes the fall of fuel due to gravity, no special power equipment for cleaning is required, and the apparatus and control are simplified as compared with the case of providing dedicated power equipment. .

Next, the control of the apparatus of the above embodiment will be described. First, at the time of normal fire extinguishing, as shown in FIG.
When the fire extinguishing mode starts (when the fire extinguishing switch is turned on), the on-off valve 12 is opened, the operation of the fuel supply pump 3 is stopped, and the fuel in the reserve tank 11 is returned to the main fuel reservoir 1. Along with extinguishing the fire, the cleaning operation of the carburetor 2 accompanying the drawing of the air is performed. This cleaning operation is performed only once, but when the fire is extinguished normally, this is sufficient because the residue is not so much accumulated.

During carburetor cleaning, which is performed in a timely or seasonal manner, as shown in FIG. 3, when the cleaning mode is started (when the dedicated cleaning switch is turned on), the fuel supply pump 3 is turned on and the reserve tank is set. Fuel is supplied to 11. Reserve tank 1
After 1 is filled with fuel, the fuel supply pump 3 is turned off and the on-off valve 12 is opened. The fuel in the reserve tank 11 is returned to the main fuel reservoir 1 and the carburetor 2 is cleaned by the accompanying air drawing. Then, the on-off valve 12 is closed, the fuel supply pump 3 is turned on again, and the fuel is supplied again into the reserve tank 11.

The on / off operation of the fuel supply pump 3 and the opening / closing operation of the opening / closing valve 12 are repeated a plurality of times. Therefore, the cleaning operation of the carburetor 2 associated with the drawing of air by opening the on-off valve 12 is repeated a plurality of times,
Even if a large amount of residue adheres and accumulates in the vaporizer 2, the residue is reliably removed by the repeated cleaning.

That is, as shown in FIG. 4, which shows the relationship between the number of times of sucking air and the recovery rate (recovery rate by cleaning the carburetor 2), the recovery rate can be increased as the number of times of repeating the above operation increases. . However, depending on the model, a certain number of times is unnecessary.

[0017]

As described above, according to the method of controlling the vaporization type combustion apparatus of the present invention, the control operation during normal fire extinguishing and during the vaporizer cleaning is changed, and during the vaporizer cleaning, the fuel is supplied to the reserve tank. Since the carburetor cleaning operation that accompanies the return of fuel from the reserve tank is repeated multiple times, even if a large amount of residue is accumulated in the carburetor, the inside of the carburetor can be cleaned more reliably. Therefore, a long-life type vaporization system can be realized.

[Brief description of drawings]

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

FIG. 2 is a time chart relating to control during normal extinction of the device of FIG.

FIG. 3 is a time chart relating to control at the time of cleaning the vaporizer of the apparatus of FIG.

4 is a relationship diagram between the number of times of suction and the recovery rate of the carburetor in the control of FIG.

[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 10 Fuel Return Channel (Fuel Return Pipe) 11 Reserve Tank 12 Open / Close Valve 13 Control Device 14 Drive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Saito 20 Kotobukicho, Isesaki City, Gunma Sanden Co., Ltd.

Claims (1)

[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. It is fed to the burner via the burner and burned by the burner, and 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 to prevent the fire and the carburetor from being cleaned. In a method for controlling a vaporization type combustion device in which an opening / closing valve is opened, when the fire is normally extinguished, the fuel is returned from the reserve tank to the main fuel reservoir only once by opening the opening / closing valve, and the fuel is supplied when cleaning the vaporizer. A vaporization type combustion apparatus characterized in that fuel supply to a reserve tank by pump operation and fuel return from the reserve tank to the main fuel reservoir by opening the on-off valve are repeated a plurality of times. Control method.