JP3014222B2 - Control method of vaporization type combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As a vaporization type combustion apparatus capable of cleaning the inside of a carburetor at the time of extinguishing a fire or performing carburetor cleaning performed at appropriate times (for example, performed seasonally), fuel supply from a fuel reservoir to the carburetor is performed. 2. Description of the Related Art It is known that a fuel return pipe is connected in the middle of a road with a fuel reservoir, and a return pump including an electromagnetic pump is provided in the fuel return pipe.
However, in this vaporization type combustion apparatus, there is a problem that power equipment dedicated to cleaning is required, and the control thereof is complicated.

In order to address this problem, although the application has not yet been published, the present applicant has temporarily reserved fuel in a fuel supply path between a fuel supply pump and a carburetor. There has been proposed an evaporative combustion apparatus in which a reserve tank is interposed, and the bottom of the reserve tank is connected to a main fuel reservoir through a fuel return path. In this device, the fuel in the reserve tank is returned to the main fuel reservoir by gravity by opening the fuel return path at the time of fire extinguishing, etc., and accordingly, the air can be drawn from the vaporizer to clean the vaporizer. . Therefore, power equipment for cleaning as described above is not required.

[0004]

However, in the prior proposal, even when extinguishing a fire, for example, during seasonal carburetor cleaning, the fuel accumulated in the reserve tank is opened to open and close the main fuel reservoir. Since the same cleaning control of performing the above-described air suction only once with the return is performed, a large amount of residue adheres particularly to the vaporizer,
At the time of cleaning in the case of accumulation, there is a possibility that the residue cannot be completely removed by only one cleaning operation.

The present invention relates to an improvement in the control method of the apparatus proposed by the applicant of the present invention. In a vaporization type combustion apparatus provided with a reserve tank, it is possible to perform a normal fire extinguishing operation, for example, a seasonal vaporization operation. An object of the present invention is to separate the cleaning operation from the cleaning operation of the vaporizer and to more reliably clean the vaporizer during the cleaning of the vaporizer.

[0006]

According to the present invention, there is provided a method for controlling a vaporization type combustion apparatus, comprising the steps of: supplying a liquid fuel in a main fuel reservoir to a reserve tank for temporarily holding the fuel by a fuel supply pump; The fuel vaporized by the vaporizer is supplied to the burner via 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. A control method for a vaporization type combustion apparatus, wherein an on-off valve is provided in the fuel return path, and the on-off valve is opened at the time of fire extinguishing and at the time of carburetor cleaning.
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 during carburetor cleaning, the fuel is supplied to the reserve tank by the operation of the fuel supply pump and the reserve by opening the on-off valve. A method for controlling a vaporized combustion apparatus, characterized in that fuel is returned from a tank to a main fuel reservoir a plurality of times.

[0007]

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

[0008] At the time of cleaning the vaporizer timely or seasonally, the cleaning operation is performed after a relatively long time of use, so that a relatively large amount of residue may adhere and accumulate in the vaporizer. . However, according to the present invention, at the time of the carburetor cleaning, fuel supply to the reserve tank (fuel replenishment) by the 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. Since the cleaning is repeated a plurality of times, the air suction for the cleaning is performed a plurality of times, the residue in the vaporizer is repeatedly removed, and the inside of the vaporizer is more reliably cleaned.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vaporization type combustion apparatus for implementing a control method according to one embodiment of the present invention.
In the figure, reference numeral 1 denotes a main fuel reservoir storing liquid fuel, and the main fuel reservoir 1 forms a constant oil leveler in which an oil level A is constantly adjusted. 2 is a vaporizer for vaporizing liquid fuel, 3 is an electromagnetic pump, 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 the vaporized fuel. Are respectively shown. The vaporizer 2 is heated by the heater 6, vaporizes the liquid fuel, and supplies the vaporized fuel from the nozzle 7 to the burner 5. 8 is a thermistor for detecting the temperature of the vaporizer 2.

Reference numeral 11 denotes a reserve tank for temporarily storing supplied fuel, which is connected to a fuel supply pipe 4 (fuel supply path) on the fuel supply pump 3 side, and has a fuel supply pipe 4 on the vaporizer 2 side connected to the top. Have been. The bottom of the reserve tank 11 is further connected to the main fuel reservoir 1 by a fuel return pipe 10 (fuel return path). These positional relations are set 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.
The fuel return pipe 10 has an on-off valve 12 comprising an electromagnetic valve for turning on and off the flow of fuel by opening and closing the pipe.
Is provided.

Reference numeral 13 denotes a control device.
3, a temperature detection signal of the vaporizer 2 is sent 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 vaporizer 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 performing, for example, seasonal vaporizer cleaning are provided separately.
It can be operated selectively.

The control method of the present invention is implemented as follows using the embodiment apparatus configured as described above. First, the basic operation of cleaning the vaporizer 2 at the time of fire extinguishing and the vaporizer cleaning by providing the reserve tank 11 will be described. In other words, when the fire is extinguished,
Is opened, the fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity, and accordingly, air is sucked from the nozzle 7 of the vaporizer 2 and the gas in the vaporizer 2 is stored in the reserve tank 11 side. The nozzle 7 and the vaporizer 2 are cleaned by the air drawn into the reserve tank 11. Since the cleaning of the vaporizer 2 utilizes the fall of fuel due to gravity, no special power equipment is required for cleaning, and the apparatus and control are simplified as compared with the case where a dedicated power equipment is provided. .

Next, the control of the above embodiment will be described. First, during normal fire extinguishing, as shown in FIG.
When the fire extinguishing mode is started (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. At the same time as the fire is extinguished, the cleaning operation of the vaporizer 2 is performed along with the above-described air suction. This cleaning operation is performed only once, but this is sufficient when the fire is normally extinguished because not much residue is accumulated.

At the time of vaporizer cleaning, which is carried out timely or seasonally, 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 turned on. 11 is supplied with fuel. 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 suction. Then, the on-off valve 12 is closed, the fuel supply pump 3 is turned on again, and the fuel is supplied into the reserve tank 11 again.

The operation of turning on / off the fuel supply pump 3 and opening / closing the on-off valve 12 is repeated a plurality of times. Therefore, the cleaning operation of the carburetor 2 due to the air suction 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 above-described repetitive cleaning.

That is, as shown in FIG. 4, the relationship between the number of times of air suction and the recovery rate (recovery rate by cleaning of the carburetor 2) can be increased as the number of repetitions of the above operation increases. . However, depending on the model, a certain number of times is not necessary.

[0017]

As described above, when the control method of the vaporizing combustion apparatus according to the present invention is used, the control operations during the normal fire extinguishing and during the carburetor cleaning are changed, and the fuel supply to the reserve tank is performed during the carburetor cleaning. Since the vaporizer cleaning operation accompanying the return of fuel from the reserve tank is repeated several times, even if a large amount of residue is accumulated in the vaporizer, the vaporizer can be more reliably cleaned. Thus, a long-life vaporization system can be realized.

[Brief description of the drawings]

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

FIG. 2 is a time chart related to control during normal extinguishing of the apparatus of FIG. 1;

FIG. 3 is a time chart relating to control during vaporizer cleaning of the apparatus of FIG. 1;

FIG. 4 is a diagram showing the relationship between the number of times of suction and the recovery rate of the vaporizer in the control of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main fuel storage 2 Vaporizer 3 Fuel supply pump 4 Fuel supply path (fuel supply pipe) 5 Burner 6 Vaporizer heater 7 Nozzle 8 Thermistor 10 Fuel return path (fuel return pipe) 11 Reserve tank 12 Open / close valve 13 Control device 14 Drive

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasushi Saito 20 Sandu, Isesaki-shi, Gunma Sanden Co., Ltd. (56) References JP-A-5-231634 (JP, A) JP, U) JP-A-62-45559 (JP, U) JP-A-62-166408 (JP, U) JP-A-59-28179 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , (DB name) F23K 5/04

Claims (1)

(57) [Claims] 1. A liquid fuel in a main fuel reservoir is supplied to a vaporizer by a fuel supply pump through a reserve tank for temporarily storing the fuel, and the fuel vaporized by the vaporizer is supplied to a nozzle. The fuel is supplied 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. In the control method of the vaporization type combustion apparatus in which the on-off valve is opened, the fuel is returned from the reserve tank to the main fuel reservoir by opening the on-off valve only once during normal fire extinguishing, and the fuel supply is performed during the carburetor cleaning. A vaporization type combustion apparatus characterized in that fuel supply to a reserve tank by pump operation and return of fuel from the reserve tank to a main fuel reservoir by opening the on-off valve are repeated a plurality of times. Control method.