JPH0634130A - Method for controlling evaporation type combustion device - Google Patents

Abstract

PURPOSE:To provide a method capable of performing a sufficient cleaning of an evaporator and capable of sensing a poor location at each of the parts in the device when the cleaning operation is carried out. CONSTITUTION:A reserve tank 11 is arranged in a fuel supplying passage 4 between a fuel supplying pump 3 and an evaporator 2. An opening or closing valve 12 is arranged in a fuel returning passage 10 extending from the reserve thank 11 (abbreviated as a tank hereinafter). When the evaporator 2 is cleaned, the opening or closing valve 12 is closed and the fuel supplying tank 3 is turned on and fuel is stored in the tank, thereafter the fuel supplying pump 3 is turned off, the opening or closing valve 12 is opened and then fuel in the tank is returned back into a main fuel storing unit 1. The evapoxator 2 is cleaned under suction of air from the evaporato 2 toward the tank, the cleaning operation is repeated by a few times, an ignition heater 9 for the burner 5 is turned on before the fuel is stored in the tank 11 only when the initial cleaning operation is performed and then when the fuel is stored in the tank 11 and in the case that a presence or a non-presence of the flame at the burner 5 is detected to produce a flame, the error processing operation is carried out.

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]

In cleaning the carburetor after the carburetion type combustion device has been used for a long period of time or after it has been stopped, clean air is passed through the carburetor for a relatively long time to clean the inside of the carburetor. It is desirable to take enough,
In the device proposed by the applicant of the present application, this request is satisfied by repeating the operation of filling the fuel in the reserve tank and sucking air from the carburetor by returning the fuel in the reserve tank to the main fuel reservoir. be able to.

According to the present invention, in the device proposed by the applicant of the present invention, while satisfying the above-mentioned demands, it is possible to detect if there is a defective portion in each part of the device during the cleaning operation, and the detection can be performed. An object is to provide a control method that can be efficiently performed.

[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 through the fuel return path, and air is sucked from the carburetor side to the reserve tank side when the fuel is returned. When the cleaning operation is repeated a plurality of times, only when the cleaning operation is performed for the first time, the ignition heater or the igniter of the burner is turned on before the fuel is stored in the reserve tank, and the fuel is stored in the reserve tank, This is a method of detecting the presence or absence of a flame in the burner and performing error processing when the flame occurs.

[0007]

In such a vaporization type combustion apparatus control method, in the cleaning process of the vaporizer, the on-off valve is closed,
By turning on the fuel supply pump, fuel is stored in the reserve tank, and by turning off the fuel supply pump and opening the on-off valve, the liquid fuel stored in the reserve tank is stored in the main fuel reservoir due to its gravity. The air is sucked back from the nozzle of the vaporizer, and the vaporizer is cleaned by the sucked air. By repeating this series of operations a plurality of times, the vaporizer is sufficiently cleaned as desired.

During this cleaning operation, the ignition heater or igniter of the burner is turned on before fuel is stored in the reserve tank, and when fuel is stored in the reserve tank, the presence or absence of flame in the burner is detected by a flame sensor or the like. By doing so, it is possible to detect a failure or malfunction of the solenoid valve that constitutes the on-off valve, clogging of each path, and the like. In other words, when fuel remains in the empty reserve tank at the start of the cleaning mode due to these malfunctions, malfunctions, clogging, etc., the fuel is filled in the fuel tank filling step. May be supplied too much, and some fuel may be supplied to the carburetor side. In addition, the same inconvenience occurs when the fuel is supplied abnormally fast due to a malfunction in any part. Whether or not such an inconvenience has occurred can be determined by ignition in the burner. When the flame is detected, this is a case where such an inconvenience occurs, and therefore, error processing (for example, error signal transmission) is immediately performed. If no flame is detected, this is a normal case, and the predetermined cleaning operation is continued.

The ignition heater or igniter of the burner is turned on only during the first cleaning operation among the cleaning operations repeated a plurality of times, and is used for detecting the malfunction of the solenoid valve and the clogging of the path. Such a malfunction of the solenoid valve or a clogging of the path will be detected once and error processing will be performed.
There is no need to detect repeatedly. By turning on the ignition heater or the igniter only during the first cleaning operation, the energization time to the ignition heater or the igniter can be the shortest time, and the detection purpose can be efficiently achieved.
Since the energization time is short, the life of the ignition heater or the like is not adversely affected, and the power consumption can be reduced.

[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 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 air-baking temperature t1 has been reached (step S3), and if not reached, heating is continued until it is reached, and if it has been reached, the number of cleaning operations is counted (step S4). The initial value is 0, and the number of times n is n + 1
Since it is counted in, n = 1 at the time of the first cleaning operation.

It is determined whether the counted number of cleaning operations is smaller than n, that is, whether the cleaning operation is the first cleaning operation (step S5). In the case of the first cleaning operation, the ignition heater 9 (or igniter) is turned on (step S6). Then, it is determined whether or not the time (for example, 20 seconds) required for heating the ignition heater 9 has elapsed (step S7), and if it has not elapsed, the mode is continued until it elapses, and If you do,
The fuel supply pump 3 is turned on and the on-off valve 12 is closed to store the fuel in the reserve tank 11 (step S
8). When it is determined in step S5 that the cleaning operation is not the first cleaning operation, the process proceeds to step S8.
The ignition heater 9 (or igniter) is not turned on.

With the fuel supply pump 3 on and the on-off valve 12 closed, it is determined whether or not a fixed time x minutes required to fill the reserve tank 11 with fuel has elapsed (step S9). If it has not elapsed, the flame sensor 15 determines the presence or absence of flame (step S10). 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, when fuel remains in the reserve tank 11 that should have been empty at the start of the cleaning mode due to these failures, malfunctions, clogging, etc. When the fuel is full, too much fuel may be supplied, and some fuel may be supplied to the carburetor 2 side. When fuel is supplied to the carburetor 2 side, the ignition heater 9 is turned on, so that the burner 5 ignites and a flame is generated. In addition, the same inconvenience occurs when the fuel is supplied abnormally fast due to a malfunction in any part.
Therefore, when the flame is detected by the flame sensor 15, this is a case where such an inconvenience occurs, and therefore, error processing (for example, error signal transmission) is immediately performed (step S11). If no flame is detected, the mode is continued until a certain time x minutes has elapsed after returning.

In such control, the failure of the solenoid valve, the malfunction, the clogging of each path, etc. are appropriately and quickly detected, so that the reliability of the apparatus is further enhanced. Further, this detection is effective only when the ignition heater 9 is turned on, and since the ignition heater 9 is turned on only during the first cleaning operation, this detection is also effective only during the first cleaning operation. Since such detection need only be performed once, detection only during the first cleaning operation is sufficient. By turning on the ignition heater 9 only during the first cleaning operation, the energization time of the ignition heater 9 is greatly increased as compared with the case where the ignition heater 9 is always turned on during a plurality of cleaning operations (normally about one hour is required as the cleaning time). Shortened.

When it is determined in step S9 that the predetermined time x minutes have elapsed, the fuel supply pump 3 is turned off, the opening / closing valve 12 is opened, and the ignition heater 9 is turned off (step S12). . 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 carburetor 2 to the reserve tank 11 side, and this intake air causes the nozzle 7 and the carburetor 2 to be sucked.
The inside is cleaned. Since the cleaning of the carburetor 2 utilizes the fall of fuel due to gravity,
No special power equipment is required for cleaning, and the equipment and control are simplified compared to the case where dedicated power equipment is provided. It is determined whether or not the time y minutes required for all the fuel in the reserve tank 11 to drop have elapsed (step S
13) If it has not elapsed, the mode is continued until it has elapsed, and if it has elapsed, it is determined whether or not the number of cleaning operations has reached a predetermined number (for example, 20 times) (step S14). If not reached, the process returns to step S4, and if reached, the carburetor heater 6 is turned off (step S15), and the cleaning mode is ended (step S16).

[0018]

As described above, according to the method for controlling the vaporization type combustion apparatus of the present invention, the vaporizer is cleaned by a plurality of cleaning operations, and
Turn on the ignition heater only during the first cleaning operation,
The flame sensor can detect the occurrence of flame to properly detect solenoid valve malfunctions, malfunctions, clogging of each path, etc., so that the carburetor can be thoroughly cleaned and the location of inconvenience can be efficiently detected. The detection can be performed with good and minimum power consumption, and the reliability of the device can be further improved.

[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.

[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 (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. 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. When the carburetor is cleaned by repeating the cleaning operation a plurality of times by returning it to the main fuel reservoir via the Only during the cleaning operation
Before the fuel is stored in the reserve tank, the ignition heater or igniter of the burner is turned on, and when the fuel is stored in the reserve tank, the presence or absence of the flame in the burner is detected, and if the flame is generated, the error processing is performed. A method for controlling a vaporization type combustion device, comprising: