JPH06147468A - Method for controlling gasification type combustion device - Google Patents

Abstract

PURPOSE:To enable a positive cleaning of a gasification device to be carried out at a proper time or in certain season in a gasification type combustion device having a reserve tank therein. CONSTITUTION:A method for controlling a gasification type combustion device in which a reserve tank 11 is installed in a fuel supplying passage 4 between a fuel supplying pump 3 and a gasification device 2, a fuel return passage 10 from the reserve tank 11 is provide with an on/off valve 12 is opened during a flame extinguishing operation and during a cleaning of the gasification device and the fuel in the reserve tank 11 is returned back to a main fuel storing device 1 is carried out such that opening or closing operation of the on/off valve 12 is repeated by a plurality of times during a fuel returning from the reserve tank 11 to the main fuel storing device 1.

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, according to the above proposal, the fuel accumulated in the reserve tank is continuously opened by opening the on-off valve during the fire extinguishing, for example, during the carburetor cleaning which is performed every season. Since cleaning was performed by returning to the reservoir and pulling in the air accompanying it, especially when a large amount of residue adheres to or accumulates in the vaporizer, the residue can be reliably removed by the above-mentioned cleaning operation. There was a risk that it could not be exhausted.

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 provided with a reserve tank, vaporization is usually performed at the time of extinguishing and, for example, seasonally. The purpose of the present invention is to enable more reliable cleaning of the vaporizer when cleaning 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 method for controlling a vaporization-type combustion apparatus, an opening / closing valve is provided in the fuel return path to open the opening / closing valve at the time of extinguishing the fire and cleaning the carburetor to return the fuel in the reserve tank to the main fuel reservoir. During the fuel returning operation from the tank to the main fuel reservoir, the opening / closing valve is repeatedly opened and closed a plurality of times.

[0007]

In the control method of the vaporization type combustion device as described above, the operation of the fuel supply pump is stopped when the fire is extinguished,
The vaporizer is heated until it reaches a higher firing temperature than in normal combustion. When the vaporizer reaches the baking temperature, the residue in the vaporizer is melted or evaporated, and the residue is easily removed. Next, in the operation of opening the on-off valve and returning the fuel in the reserve tank to the main fuel reservoir, repeatedly opening and closing the on-off valve a plurality of times to forcibly and intermittently pulsate the air to be sucked. Thereby, the inside of the vaporizer is more surely cleaned.

[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, after the fuel is filled in the reserve tank at the time of cleaning the carburetor, heating is performed until the carburetor reaches the bake temperature, and after the residue in the carburetor is melted or evaporated in advance to be easily removed. The on-off valve is opened and the fuel in the reserve tank is returned to the main fuel reservoir. In this operation, the opening / closing valve is repeatedly opened and closed a plurality of times to give pulsation, so that the inside of the carburetor can be cleaned more reliably.

By repeating a series of cleaning operations at the time of cleaning the vaporizer as described above a desired number of times, a cleaning effect can be reliably obtained even if a large amount of residue is accumulated in the vaporizer. .

[0010]

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, which is connected to a fuel supply pipe 4 (fuel supply passage) on the fuel supply pump 3 side, and connected to a fuel supply pipe 4 on the carburetor 2 side at 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 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 it is not necessary to provide dedicated power equipment.

Next, the control of the present invention performed using the apparatus of the above embodiment will be described. Figure 2 when extinguishing a fire
As shown in (4), when the fire extinguishing mode is started (step S1), the fuel supply pump 3 is turned off (step S1).
2) The carburetor 2 is heated by the heater 6 to the air-baking temperature t ₁ ° C (for example, 400 ° C) (step S3), and it is determined whether or not the predetermined air-baking temperature t ₁ ° C has been reached (step S3). S4), if not reached, the mode is repeated until it is reached, and if reached, the on-off valve 12 is opened (step S5).

When the opening / closing valve 12 is opened in step S5, the fuel in the reserve tank 11 drops into the main fuel reservoir 1. After this operation, it is determined whether or not a predetermined time x minutes has elapsed (step S6). If not, the mode is repeated until the time elapses,
When the time has elapsed, the on-off valve 12 is closed (step S
7) The fuel drop is temporarily stopped. After the on-off valve 12 is closed, it is determined whether or not a predetermined time y has elapsed (step S8). If not, the mode is repeated until the time elapses.

When it is confirmed that y minutes have elapsed in step 8, the series of operation times n from step S5 to step S8 is counted as n + 1 times (starting from n = 0) (step S9). Further step S9
Value and predetermined step S5 to step S8
The predetermined number of operations n ₁ is compared with (step S1
0), and if n ≦ n ₁ , step S5 to step S8
The series of operations up to is repeated, and if n> n ₁ , this flow ends (step S11).

As described above, steps S5 to S
By repeating a series of operations up to 10, the air sucked from the nozzle 7 can be forcibly and intermittently pulsated, and the cleaning effect inside the carburetor 2 can be reliably obtained.

During carburetor cleaning, which is carried out timely or seasonally, as shown in FIG. 3, when the cleaning mode is started (step S21), the fuel supply pump 3 is turned on and fuel is supplied into the reserve tank 11. (Step S22). After the start of step 22, it is determined whether or not a predetermined predetermined time z minutes have elapsed (step 23). If not, the mode is repeated until the time elapses. Since the tank 11 is filled with fuel, the fuel supply pump 3 is turned off (step S24).

Next, the vaporizer 2 is heated by the heater 6 to the air-baking temperature t ₁ ° C (for example, 400 ° C) (step 25), and it is determined whether or not the predetermined air-baking temperature t ₁ ° C has been reached. (Step S26), and if not reached, the mode is repeated until it is reached, and if reached, the on-off valve 12 is opened. (Step S27).

When the on-off valve 12 is opened in step S27, the fuel in the reserve tank 11 is stored in the main fuel reservoir 1
To fall. After this operation, a predetermined time x
It is determined whether or not the minutes have elapsed (step S28). If the minutes have not elapsed, the mode is repeated until the time has elapsed, and if the minutes have elapsed, the on-off valve 12 is closed (step S29), and the fuel is The fall of the is suspended. After the on-off valve 12 is closed, it is determined whether or not a predetermined predetermined time y has elapsed (step S30). If not, the mode is repeated until the time elapses.

When it is confirmed that y minutes have elapsed in step S30, the number of times n of operations from step S27 to step S30 is counted as n + 1 times (starting from n = 0) (step S31). Further, the count number n of step S31 is compared with the predetermined number of operations n ₁ from step S27 to step S30 (step S32) to determine the predetermined number of operations n.
_{If 1} is not reached (does not exceed), that is, n ≤
In the case of n ₁ , the series of operations from step S27 to step S30 is repeated, and when the predetermined number of operations n ₁ is reached, that is, when it is determined that n> n ₁ , this flow is ended (step S33).

By repeating the series of operations from step S27 to step S32 as described above, the air sucked from the nozzle 7 is forcibly and intermittently pulsated, so that a large amount of accumulation in the vaporizer 2 occurs. The vaporizer 2 will be sufficiently cleaned even if there is an object attached.

Further, during the vaporizer cleaning, which is performed in a timely or seasonal manner, an operation as shown in FIG. 4 can be added. That is, step S described in FIG.
The series of operation times n ₁ from 27 to step S32 is cleared, the series of operation times m from step S22 to step S32 is counted as m + 1 (start from m = 0) (step S33), and further predetermined. compared step 22 a series of operations the number m ₁ from step S32 (step S34), a predetermined number of operations m ₁
Is not reached (does not exceed), that is, m ≦ m ₁
In the case of, the series of operations from step S22 to step S33 is repeated, and when the predetermined number of operations m ₁ is reached, that is, when it is determined that m> m ₁ , this flow is ended (step S35).

Steps S33 and S34 described above
Even if the residue in the vaporizer 2 is accumulated in a considerably large amount, it is possible to obtain a more sufficient cleaning effect for the vaporizer 2 by adding.

[0025]

As described above, according to the method for controlling the vaporization type combustion apparatus of the present invention, the on-off valve is used when the fuel is dropped from the reserve tank to the main fuel reservoir during normal fire extinguishing and cleaning of the vaporizer. Since the opening and closing of is repeated multiple times, even if a large amount of residue is accumulated in the vaporizer, the inside of the vaporizer can be cleaned more reliably, and 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 flow chart relating to control during normal fire extinguishing of the device of FIG.

FIG. 3 is a flowchart relating to control during vaporizer cleaning of the apparatus of FIG.

FIG. 4 is a flow chart relating to another control at the time of cleaning the vaporizer of the apparatus 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 (3)

[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 a fuel in a reserve tank is returned to the main fuel reservoir by opening the on-off valve, the on-off valve is opened and closed during a fuel returning operation from the reserve tank to the main fuel reservoir. A method for controlling a vaporization type combustion device, which is characterized by repeating a plurality of times. 2. The method for controlling a vaporization type combustion device according to claim 1, wherein the opening / closing valve is repeatedly opened and closed after the vaporizer reaches a predetermined temperature. 3. The method for controlling a vaporization type combustion device according to claim 1, wherein a series of operations for returning fuel from the reserve tank to the main fuel reservoir is repeated a plurality of times.