JPH06101830A - Vaporizing combustion apparatus - Google Patents

Abstract

PURPOSE:To accurately judge whether a vaporizing combustion apparatus operates normally or not, by accurately detecting behavior of fuel in a reservoir at the time of fire extinguishing and ignition. CONSTITUTION:A vaporizing combustion apparatus comprises a reservoir 11 provided on a fuel supply passage 4 between a fuel supply pump 3 and a vaporizer 2, an opening and closing valve 12 provided on a fuel return passage 10 leading from the reservoir 11 and a liquid level sensor 15 provided in the reservoir 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a new type vaporization type combustion device in which a reserve tank for temporarily holding fuel is provided in a fuel supply passage 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 carburetor 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, 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. At the time of ignition, the reserve tank is filled with the fuel supplied from the fuel supply pump, and the fuel is supplied to the carburetor from there.

[0004]

DISCLOSURE OF THE INVENTION In the above-proposed device, in order to confirm that the device is operating normally without clogging of the on-off valve and piping when extinguishing or igniting, It is desirable to understand the behavior of the fuel in the reserve tank (behavior of the liquid level).

In the previously proposed apparatus, the above-mentioned behavior is grasped by the flame current of the flame sensor provided in the burner. However, the flame current detection in the burner section is not a direct detection of the behavior of the fuel in the reserve tank, but a secondary (indirect) detection, so it is difficult to detect the behavior accurately. there were.

The present invention relates to an improvement of the device previously proposed by the applicant of the present invention. In a vaporization type combustion device equipped with a reserve tank, the behavior of the fuel in the reserve tank can be accurately measured when extinguishing or igniting. The purpose is to enable accurate determination as to whether or not the device is operating normally.

[0007]

According to the vaporization type combustion apparatus of the present invention for this purpose, the liquid fuel in the main fuel reservoir is vaporized by a fuel supply pump through a reserve tank for temporarily holding the fuel. 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 passage, An evaporative combustion apparatus having an opening / closing valve provided in a return path comprises the reserve tank provided with a liquid level sensor for detecting a liquid level in the tank.

[0008]

In the vaporization type combustion device as described above, since the liquid level sensor directly detects the presence or absence of fuel in the reserve tank at the liquid level sensor mounting position, when extinguishing a fire,
The behavior of the fuel in the reserve tank at the time of ignition is accurately detected.

That is, at the time of extinguishing the fire, the fuel supply pump is turned off and the on-off valve is opened, and the fuel in the reserve tank is dropped and returned to the main fuel reservoir. If the liquid level in the reserve tank does not drop below the level of the liquid level sensor even after the passage of time, it is determined that the on-off valve or piping may be clogged, and after a certain period of time, the liquid level sensor position If there is no fuel, that is, if the liquid level drops below that, it is determined that the fuel has normally dropped from the reserve tank to the main fuel reservoir.

At the time of ignition, when the ignition mode is started, the presence or absence of fuel at the position of the liquid level sensor is first confirmed. If there is fuel, the fuel is normally returned from the reserve tank to the main fuel reservoir at the time of the previous extinction. Since it has not been done, it is determined that there is a risk of clogging of the on-off valve and piping, and when there is no fuel, it is determined that the reserve tank is normally empty.

Then, the fuel supply pump is turned on and the on-off valve is closed, and the fuel starts to be stored in the reserve tank. At this time, the liquid level in the reserve tank is detected even after a predetermined time has elapsed. If it does not rise above the position, it is determined that there is an abnormality in the on-off valve and fuel supply pump,
When the liquid level rises above the position of the liquid level sensor after the elapse of a predetermined time, it is determined that the fuel is normally stored in the reserve tank.

As described above, by directly detecting the presence / absence of fuel by the liquid level sensor, it is accurately determined whether or not the device is operating normally.

[0013]

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 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 the vaporized fuel 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. The reserve tank 11 is provided with a liquid level sensor 15 that detects the liquid level in the tank, that is, the presence or absence of fuel in the tank at that position.

Reference numeral 13 denotes a control device, and the control device 1
3 sends an energization control signal to the ignition heater 9, and a liquid level sensor 15 of the reserve tank 11 sends a detection signal of the presence / absence of fuel in the tank at the mounting position of the liquid level sensor 15 to the control device 13 for vaporization. From 2, the thermistor 8
Sends a temperature detection signal of the vaporizer 2. 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 operation of the embodiment apparatus configured as described above will be described. First, the cleaning of the carburetor 2 at the time of extinguishing a fire by providing the reserve tank 11 will be described. That is, when the on-off valve 12 is opened at the time of extinguishing the fire, the fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity, and accordingly, the air is sucked from the nozzle 7 of the carburetor 2 and the carburetor 2 It is drawn into the reserve tank 11 side and the reserve tank 11 together with the gas inside, and the nozzle 7 and the carburetor 2 are cleaned by this air drawing. 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 the control are simplified as compared with the case where dedicated power equipment is provided. .

Next, the reserve tank 1 of the apparatus of the above embodiment
The control for confirming and determining the behavior of the fuel in 1 (the behavior of the liquid surface) will be described. When extinguishing the fire, as shown in FIG. 2, when the fire extinguishing mode starts (step S
1), the fuel supply pump 3 is turned off, the on-off valve 12 is opened, and the fire extinguishing operation and the above cleaning operation are performed (step S2). After this operation, it is determined whether or not a predetermined time x minutes has elapsed (step S3),
If the time has not elapsed, the mode is repeated until the time elapses. If the time has elapsed, the signal from the liquid level sensor 15
That is, the detection signal indicating whether or not the tank fuel is present at the mounting position of the liquid level sensor 15 is determined (step S4).

In this step S4, the liquid level sensor 1
If it is determined from the signal from No. 5 that there is fuel at the mounting position of the liquid level sensor 15 even after x minutes have elapsed, the fuel in the reserve tank 11 has fallen normally or at a normal fall rate. There is no such thing, so the on-off valve 12 and piping 1
It is determined that 0 (in some cases, the pipe 4) has an abnormality such as clogging, and error processing is performed (step 5). After x minutes, if there is no fuel at the mounting position of the liquid level sensor 15,
Since the fuel in the reserve tank 11 has fallen normally, this confirmation flow ends (step 6).

At the time of ignition, as shown in FIG. 3, the ignition mode starts (step S11). First, the presence or absence of fuel at the mounting position of the liquid level sensor 15 is determined by the signal from the liquid level sensor 15. (Step S1
2). If there is fuel, it means that the fuel did not fall normally during the previous fire extinguishing and the fuel remains in the reserve tank 11, so it is determined that there is a risk of blockage of the on-off valve 12 and piping, and an error occurs. Is processed (step S1)
3). When there is no fuel, it is determined that the inside of the reserve tank 11 is normally empty, the fuel supply pump 3 is turned on, and the on-off valve is closed (step S14).

Then, after step S14, it is judged whether or not y minutes have elapsed (step S15), and if not, the mode is repeated until the time elapses. Based on the signal from 15, it is determined whether or not there is fuel in the tank at the mounting position of the liquid level sensor 15 (step S16). If there is no fuel, it means that the fuel has not been stored in the reserve tank 11 to a predetermined level within the predetermined time y, and an error process is performed (step S17). If there is fuel, it is determined that the fuel is normally stored, and the confirmation flow ends (step S18).

At the time of ignition, the heater 6 of the carburetor 2 is turned on to heat the carburetor 2 to a predetermined combustion temperature. If this operation flow is set in parallel with the above confirmation flow, The time to ignition can be shortened.

[0022]

As described above, according to the vaporization type combustion apparatus of the present invention, a liquid level sensor is provided in the reserve tank so as to directly detect the presence or absence of fuel at a predetermined position in the reserve tank. Since it is used at the time of extinguishing and igniting, it is possible to accurately determine whether the on-off valve or piping is clogged, etc., and it is possible to realize a vaporization combustion device that can operate more stably. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vaporization type combustion device according to an embodiment of the present invention.

FIG. 2 is a flow chart relating to one control during fire extinguishing of the device of FIG.

FIG. 3 is a flowchart relating to one control during ignition of the device 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 Liquid level sensor

 ─────────────────────────────────────────────────── ─── 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. In the vaporization type combustion device in which the bottom portion of the reserve tank and the main fuel reservoir are connected by a fuel return passage and an opening / closing valve is provided in the fuel return passage, the reserve tank is provided. A vaporization type combustion apparatus, characterized in that a liquid level sensor for detecting the liquid level in the tank is provided in the. 2. The liquid level sensor is a sensor for detecting the presence / absence of fuel in the reserve tank at the liquid level sensor position when the fuel supply pump is turned off and a predetermined time has elapsed after the opening / closing valve is opened when a fire is extinguished. Evaporative combustion device. 3. The liquid level sensor detects the presence / absence of fuel in the reserve tank at the position of the liquid level sensor at the time of ignition, and at the time when a predetermined time elapses after the fuel supply pump is turned on and the on-off valve is closed, the liquid level sensor. A sensor for detecting the presence or absence of fuel in the reserve tank at a position.
Or the vaporization type combustion device of 2.