JPH0634123A - Controlling method for evaporation type combustion device - Google Patents

Abstract

PURPOSE:To improve an effect of cleaning of an evaporator by a method wherein a large amount of air is sucked at first and then air is sucked continuously. CONSTITUTION:This combustion device is constructed such that a reserve tank 11 is installed in a fuel supplying passage 4 between a fuel supplying pump 3 and an evaporator 2 and an opening or closing valve 12 is arranged at a fuel returning passage 10 extended from the reserve tank 11. When the evaporator 2 is cleaned, the opening or closing valve 12 is closed, the fuel supplying pump 3 is turned on to accumulate fuel within the reserve tank 11, thereafter the fuel supplying pump 3 is turned off, the opening or closing valve 12 is opened and the fuel within the reserve tank 11 is returned back into a main fuel storing unit 1 as the first stage cleaning, and the fuel supplied by the fuel supplying pump 3 is returned through the reserve tank 11 and the fuel returning passage 10 into the major fuel storing unit 1 as it is as a second stage cleaning.

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 vaporizer 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.

[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, by opening the fuel return path during fire extinguishing or cleaning, the fuel in the reserve tank is returned to the main fuel reservoir by gravity, and along with that, air is drawn from the carburetor to clean the carburetor. it can. Therefore, the power equipment for cleaning as described above is unnecessary.

[0004]

The cleaning of the carburetor, which is carried out after the carburetion type combustion apparatus has been stopped for a long time, removes a large amount of clean air through the carburetor to strongly clean the inside of the carburetor. Even with a small amount of cleaning air, it is most desirable to perform both cleaning operations by continuously passing through the vaporizer for a relatively long time to clean the vaporizer.

According to the present invention, in the device proposed by the present applicant, in order to satisfy the above demands, a large amount of air is first sucked in, and then air is continuously sucked in to the carburetor. It is an object of the present invention to provide a control method capable of enhancing the cleaning effect of

[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 in which an opening / closing valve is provided in the fuel return path, at the time of cleaning the carburetor, the opening / closing valve is closed, the fuel supply pump is turned on, and the fuel is stored in the reserve tank.
The fuel supply pump is turned off, the on-off valve is opened, the fuel in the reserve tank is returned to the main fuel reservoir via the fuel return passage, and the fuel supply pump is turned on with the on-off valve opened. This is a method of performing a second stage cleaning in which the fuel supplied by the fuel supply pump is returned to the main fuel reservoir as it is through the reserve tank and the fuel return passage.

Further, in the above control method,
Before storing fuel in the reserve tank, turn on the ignition heater of the burner.When storing fuel in the reserve tank, the presence or absence of flame in the burner is detected, and if flame occurs, error handling is performed. May be.

[0008]

In the method for controlling the vaporization type combustion apparatus, the liquid fuel accumulated in the reserve tank is returned to the main fuel reservoir by its gravity during the first stage cleaning in the vaporizer cleaning process. Along with this, a large amount of air is sucked from the nozzle of the carburetor, and the carburetor is cleaned by the large amount of sucked air.

During the subsequent second-stage cleaning, the fuel supply pump is turned on with the opening / closing valve being opened, and the fuel supplied by the fuel supply pump is directly supplied to the main tank through the empty reserve tank and the fuel return passage. Returned to the fuel reservoir. At this time, air is drawn from the carburetor side to the reserve tank side due to the ejector effect accompanying the circulation of the fuel. Although this intake air amount is relatively small, it is continuously performed during the fuel circulation, and the state can be continued for a required time.

Therefore, the first stage cleaning cleans the carburetor with a large amount of intake air, and the second stage cleaning cleans the carburetor with a relatively small amount of continuously sucked air. Is effectively cleaned.

[0011]

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, 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
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. As shown in FIG. 2, when the cleaning switch is turned on and the cleaning mode is started (step S1), the temperature of the carburetor 2 is heated to the idling temperature t1 (higher than the control temperature during normal combustion) ( Step S2). It is determined whether or not the bake-out temperature t1 has been reached (step S3), and if it has not reached, heating is continued until it reaches, and if it has reached, the fuel supply pump 3 is turned on and the on-off valve 12 is closed. Fuel is stored in the reserve tank 11 (step S4). In this state, it is determined whether or not a fixed time x minutes required to fill the reserve tank 11 with fuel has passed (step S5). If not, the mode is continued until the time passes, When the time has passed, the first stage cleaning is started.

In the first-stage cleaning, the fuel supply pump 3 is turned off and the on-off valve 12 is opened (step S
6), the fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity, and accordingly, a large amount of air is sucked from the nozzle 7 of the carburetor 2 to the reserve tank 11 side, and this large amount of intake air causes the nozzle to First, the inside of 7 and the inside of the vaporizer 2 are strongly cleaned. 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. . It is determined whether or not the time y required for all the fuel in the reserve tank 11 to drop has elapsed (step S7). If it has not elapsed, the mode is continued until it elapses. , The second stage cleaning is started.

In the second stage cleaning, the on-off valve 1
The fuel supply pump 3 is turned on with the valve 2 left open (step S8), and the fuel supplied by the fuel supply pump 3 remains in the main fuel reservoir 1 through the empty reserve tank 11 and the fuel return passage 10. Returned to. That is, the fuel is circulated without being sent to the carburetor 2 side. At this time, air is drawn from the carburetor 2 side to the reserve tank 11 side by the ejector effect accompanying the circulation of the fuel. Although this intake air amount is relatively small, it is continuously performed during the fuel circulation, and the state can be continued for the required time z. Then, it is determined whether or not the required time z minutes have elapsed (step S9), and if it has not elapsed, the mode is continued until it elapses, and if it has elapsed, the fuel supply pump 3 is turned off, The vaporizer heater 6 is turned off (step S10), and the cleaning mode is ended (step S11).

The first stage cleaning cleans the carburetor 2 with a large amount of intake air, and the second stage cleaning cleans the carburetor 2 with a relatively small amount of continuously sucked air. 2 is strongly, thoroughly and effectively cleaned.

In the above control, the following control can be further added. That is, as shown in FIG. 3, steps S21 to S24 can be added. Since other steps in FIG. 3 are the same as those shown in FIG. 2, the same reference numerals as those in FIG. 2 are attached. In the control shown in FIG. 3, after the temperature of the vaporizer 2 reaches the idling temperature t1, the ignition heater 9 is turned on (step S21). Then, it is determined whether or not the time required for heating the ignition heater 9 (for example, 20 seconds) has elapsed (step S22), and if it has not elapsed, the mode is continued until it elapses, and In this case, as described above, the fuel supply pump 3 is turned on and the opening / closing valve 12 is closed to store the fuel in the reserve tank 11 (step S4).

In this state, it is determined whether or not a fixed time x minutes required for filling the reserve tank 11 with fuel has elapsed (step S5). If not, the flame sensor 15 determines. The presence or absence of flame is determined (step S
23). The presence / absence of a flame is determined by the flame sensor 15 in order to detect a failure of the on-off valve 12, which is an electromagnetic valve, a malfunction, a clogging of each path, and the like. That is,
If fuel remains in the empty reserve tank 11 at the start of the cleaning mode due to these failures, malfunctions, clogging, etc., the reserve tank 11 is filled with fuel in step S5. There is a risk that the fuel will be supplied too much and the fuel will be partially supplied to the carburetor 2 side. In addition, the same inconvenience occurs when the fuel is supplied abnormally fast due to a malfunction in any part. Therefore, when a flame is detected by the flame sensor 15, this is a case where such an inconvenience occurs, and therefore, error processing is immediately performed (for example, error signal transmission).
(Step S24). If no flame is detected,
The mode is continued until a certain time x minutes have passed after returning.

In such control, failure of the solenoid valve, malfunction, clogging of each path, etc. are detected appropriately and quickly, so that the reliability of the apparatus is further enhanced.

[0021]

As described above, according to the control method of the vaporization type combustion apparatus of the present invention, a large amount of air is sucked in to clean the vaporizer in the first stage cleaning, and a relatively large amount is cleaned in the second stage cleaning. Since a small amount of air is continuously sucked in to clean the carburetor, the carburetor can be powerfully, sufficiently and effectively cleaned. Also, when the reserve tank is filled with fuel, the ignition heater is turned on and the flame sensor is used to detect the presence or absence of flames, so that malfunctions of solenoid valves, malfunctions, clogging of each path, etc. Proper detection is possible and the reliability of the device can be further enhanced.

[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 flowchart relating to one control during cleaning of the apparatus of FIG.

FIG. 3 is a flowchart relating to another control at the time of cleaning 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 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

Front Page Continuation (72) Inventor Yasushi Saito 20 Kotobukicho, Isesaki City, Gunma Sanden Co. Ltd.

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 of controlling the vaporization type combustion device, in which the bottom of the reserve tank and the main fuel reservoir are connected by a fuel return path, and an on-off valve is provided in the fuel return path, while feeding to the burner for combustion through the burner, When cleaning the carburetor, the on-off valve is closed, the fuel supply pump is turned on to store the fuel in the reserve tank, and then the fuel supply pump is turned off and the on-off valve is opened to return the fuel in the reserve tank to the fuel return path. The first-stage cleaning that returns to the main fuel reservoir via the, and the fuel supply pump is turned on with the on-off valve open, and the fuel supplied by the fuel supply pump is stored in the reserve tank and the fuel return. A method for controlling a vaporization-type combustion apparatus, which comprises performing a second-stage cleaning for returning the main fuel reservoir as it is through a passage. 2. Before the fuel is stored in the reserve tank, the ignition heater of the burner is turned on, and when the fuel is stored in the reserve tank, the presence or absence of flame in the burner is detected, and if the flame is generated, Claim 1 which performs error processing
Control method of the vaporization type combustion device.