JPH0596711U - Evaporative combustion device - Google Patents

Abstract

(57) [Summary] [Purpose] When cleaning the carburetor by returning the fuel from the reserve tank, the desired cleaning is completed by one fuel returning operation. [Structure] A reserve tank 11 is provided in a fuel supply passage 4 between a fuel supply pump 3 and a carburetor 2, and a fuel return passage 10 from the reserve tank 11 is provided with an opening / closing valve 12 so that the opening / closing valve 12 is opened. The fuel in the reserve tank 11 is returned to the main fuel reservoir 1 by gravity, and the carburetor 2 is cleaned by the intake of air from the carburetor 2 to the reserve tank 11, and the cleaning of the carburetor 2 is performed. The vaporization type combustion device in which the fuel return passage 10 is provided with a flow passage resistance that makes the fuel return time equal to or more than a certain value so that the above is completed by one time of drawing in the air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vaporization type combustion device capable of cleaning the inside of a vaporizer when a fire is extinguished or timely.

[0002]

[Prior Art]

 As a vaporization type combustion device capable of cleaning the inside of the vaporizer, the one shown in FIG. 7 is known. In FIG. 7, 1 is a main fuel reservoir that stores liquid fuel, 2 is a vaporizer that vaporizes liquid fuel, and 3 is an electromagnetic pump that supplies fuel from the main fuel reservoir 1 to the vaporizer 2 Fuel supply A pump 4, a fuel supply pipe 5, and a burner 5 for burning vaporized fuel are respectively shown. 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 is a return pump composed of an electromagnetic pump, 10 is a fuel return pipe, and the fuel return pipe 10 connects the fuel supply pipe 4 and the main fuel reservoir 1 on the downstream side of the fuel supply pump 3. In this vaporization type combustion device, the return pump 9 is operated at the time of digestion, and the gas remaining in the vaporizer 2 is returned to the main fuel reservoir 1 for cleaning.

However, in the above vaporization type combustion device, there is a problem that a power facility dedicated to cleaning is required and its control becomes complicated.

In order to deal with this problem, although it is still in an unpublished stage, the applicant previously installed a reserve tank in the fuel supply path between the fuel supply pump and the carburetor, and A vaporization-type combustion device has been proposed in which the bottom of the tank is connected to the main fuel reservoir via a fuel return path. In this device, by opening the fuel return path, the fuel in the reserve tank is returned to the main fuel reservoir by gravity, and along with that, the air can be drawn from the carburetor to clean the carburetor. Therefore, the power equipment for cleaning as shown in FIG. 7 becomes unnecessary.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned device proposed by the applicant of the present invention, a relatively thick pipe equivalent to the fuel supply passage to the reserve tank is used for the fuel return passage, so that a short time is required when the fuel return passage is opened. The fuel in the reserve tank will soon be returned to the main fuel reservoir. Therefore, since the carburetor cleaning time due to the air being drawn from the carburetor accompanying this fuel return is short, the fuel return passage should be closed again via the fuel supply passage to complete the carburetor cleaning at the desired level. It was necessary to repeat the operation of filling the reserve tank with fuel, opening the fuel return path again, and returning the fuel from the reserve tank to the main fuel reservoir several times. If the fuel is returned and the fuel is supplied a plurality of times in this way, not only the control becomes complicated, but also the carburetor cleaning time becomes long considerably at the time of fire extinguishing.

The present invention relates to an improvement of the apparatus previously proposed by the present applicant, which does not require additional power equipment for cleaning the carburetor, and further cleans by drawing air from the carburetor. It is an object of the present invention to provide a vaporization-type combustion apparatus that can perform desired cleaning very easily in a single operation in a relatively short time.

[0007]

[Means for Solving the Problems]

 The vaporization type combustion device of the present invention which meets this purpose feeds the liquid fuel in the main fuel reservoir to the vaporizer by the fuel supply pump, and feeds the fuel vaporized by the vaporizer to the burner through the nozzle. In a vaporization combustor that burns with a burner, a reserve tank holding fuel is installed in the fuel supply path between the fuel supply pump and the carburetor, the bottom of which is set higher than the oil level of the main fuel reservoir. The bottom 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 so that the fuel in the reserve tank is gravitated into the main fuel reservoir when the opening / closing valve is opened. The fuel return path is configured so that the carburetor is returned and the air is drawn from the carburetor into the reserve tank to clean the carburetor, and the cleaning of the carburetor is completed by one-time drawing of the air. Consists of even the fuel return time remembering passage resistance to a certain value or more.

In order to provide the fuel return path with the above-described flow path resistance, for example, the flow path diameter of the fuel return path is reduced as much as the above function is achieved, the valve diameter of the on-off valve is reduced, and the on-off valve is greatly restricted. For example, to make the effect effective, to increase the resistance by increasing the flow path length by intentionally lengthening the fuel return path, and to provide the fuel return path with the flow path resistance by configuring the fuel return path as a spiral flow path. There is a method.

[0009]

[Action]

 In the above vaporization type combustion device, the level of the bottom of the reserve tank is set higher than the oil level of the main fuel reservoir, so when the fire is extinguished, the fuel supply pump is stopped and the on-off valve is opened. The liquid fuel in the tank is returned to the main fuel reservoir due to its gravity. Along with this, air is sucked in from the nozzle of the vaporizer, and the residual gas in the vaporizer is drawn together with the air to the reserve tank side and collected. The carburetor is cleaned mainly by this air drawing. When the on-off valve is closed when the liquid fuel in the reserve tank is exhausted and the fuel supply pump is operated, the liquid fuel is supplied to the reserve tank and the air in the reserve tank is supplied to the carburetor accordingly.

In the device of the present invention, the fuel return time from the reserve tank to the main fuel reservoir is set to be a certain value or more, that is, the cleaning operation is performed once by the air intake (and therefore the fuel return) by the air intake. In order to complete, the flow path resistance that makes the fuel return time a certain value or more is intentionally given to the fuel return path. Due to this flow path resistance, the fuel return time is kept longer than a certain level, and cleaning is always performed during the fuel return. Therefore, the operation (control) is simplified and the cleaning performance is improved.

In addition, the desired vaporizer cleaning is completed by one fuel return operation, and the repetition of fuel supply and fuel return is unnecessary, resulting in a cleaning time (substantially, only for the portion without repeated fuel supply). Is shortened.

[0012]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a vaporization type combustion apparatus according to an embodiment of the present invention. In the figure, portions substantially equivalent to those shown in FIG. 7 are designated by the same reference numerals as those in FIG.

The main fuel reservoir 1 is a constant oil level gauge in which the oil level A is constantly adjusted. Reference numeral 11 is a reserve tank for holding the supplied fuel, to which a fuel supply pipe 4 (fuel supply passage) on the fuel supply pump 3 side is connected, and a fuel supply pipe 4 on the carburetor 2 side is connected to the top. The reserve tank 11 is further connected to the bottom thereof 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 is provided with an opening / closing valve 12 which is an electromagnetic valve for turning on / off the flow of fuel by opening / closing the conduit.

The flow path resistance of the fuel return pipe 10 is set so that the fuel return time from the reserve tank 11 to the main fuel reservoir 1 when the opening / closing valve 12 is opened becomes a certain value or more. In the present embodiment, this flow path resistance is given by setting the pipe diameter (inner pipe diameter) of the fuel return pipe 10 small.

The flow path resistance is set as follows. 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. In order for the vaporizer 2 to be cleaned to a desired level, it takes a certain time or more for the cleaning operation accompanying the air drawing. In other words, the fuel return operation time is required for a certain time or longer. The flow path resistance is set so that the fuel return time is equal to or longer than a certain value so that this desired level of cleaning is completed by one time of drawing air, that is, one time of returning fuel.

When the device of the above embodiment in which the tube diameter is reduced is compared with the device previously proposed by the present applicant, it becomes as shown in FIG. 2 (previous proposal) and FIG. 3 (present embodiment). That is, compared with the fuel return pipe 21 shown in FIG. 2, the fuel return pipe 10 of the present embodiment has a significantly smaller pipe diameter and a larger flow passage resistance. Due to this large flow path resistance, the fuel return time becomes long, and the cleaning of the carburetor 2 can be completed by returning the fuel once.

Reference numeral 13 in FIG. 1 is a control device composed of a microcomputer, which controls driving of the fuel supply pump 3 and the opening / closing valve 12 according to a program described later. Reference numeral 14 is a drive device for driving these.

Next, the operation of the vaporization type combustion device having the above configuration will be described. FIG. 4 is a flowchart showing the operation. When the control power source is turned on and the control is started, as a default, the fuel supply pump 3 and the heater 6 are turned off and the on-off valve 12 is closed (S1, S2, S3). Then, after waiting for the designation of combustion, if there is the designation of combustion (S4), the heater 6 is turned on (S5). When the inside of the carburetor 2 is heated by the heater 6 and reaches a predetermined temperature (S6), the fuel supply pump 3 is turned on (S7), and the liquid fuel is supplied to the carburetor 2. When the fuel supply pump 3 is operated for a predetermined time t1 (S8), it is ignited by an ignition device (not shown) (S9), and thereafter, combustion is continued.

After that, when the fire extinguishing is designated (S10), the fuel supply pump 3 is turned off (S11), the heater 6 is controlled to a predetermined temperature (S12), and the on-off valve 12 is further opened (S13). ). As a result, the liquid fuel in the reserve tank 11 is returned to the main fuel reservoir 1 due to its gravity. As the oil level in the reserve tank 11 lowers, air is sucked from the nozzle 7 of the carburetor 2, and the residual gas in the carburetor 2 is drawn together with the air into the reserve tank 11 side to be collected, cleaned, and extinguished. When this state continues for a predetermined time t2 (S14), the on-off valve 12 is closed (S15) and the fuel supply pump 3 is turned on (S16). As a result, the oil level in the reserve tank 11 rises, the air in the reserve tank 11 is supplied to the vaporizer 2, and the inside of the vaporizer 2 is cleaned. By continuing this state for a predetermined time t3 (S17), it is confirmed that the oil level in the reserve tank 11 has risen to the vicinity of its top, and the state returns to the initial state. Since this apparatus has a long t2 time, cleaning is completed by returning the fuel once.

If there is no designation of combustion (S4) and designation of cleaning (S18), the fuel supply pump 3 is turned off (S19), the heater 6 is controlled to a predetermined temperature (S20), and the on-off valve is further opened. 12 is opened (S21). As a result, the liquid fuel in the reserve tank 11 is returned to the main fuel reservoir 1. As the oil level in the reserve tank 11 lowers, air is sucked from the nozzle 7 of the carburetor 2, and the gas in the carburetor 2 is drawn into the reserve tank 11 side together with the air for cleaning. When this state continues for a predetermined time t4 (S22), the opening / closing valve 12 is closed (S23), and the fuel supply pump 3 is turned on (S24). As a result, the oil level in the reserve tank 11 rises, the air in the reserve tank 11 is supplied to the carburetor 2, and the inside of the carburetor 2 is cleaned. By continuing this state for a predetermined time t5 (S25), it is confirmed that the oil level in the reserve tank 11 has risen to the vicinity of its top, and the state returns to the initial state. Since this device has a long t4 time, the cleaning is completed by returning the fuel once.

FIG. 5 shows another embodiment for providing the fuel return path with a flow path resistance that keeps the fuel return time longer than a certain value. In this embodiment, the fuel return passage is composed of a spiral passage and the fuel return pipe is composed of a spiral pipe 21. By configuring in this way, a greater flow resistance is given than in the case of the fuel return path consisting of a straight pipe, and by appropriately setting the flow resistance, the fuel return time is at least a desired fixed value, In other words, cleaning of the carburetor can be completed by drawing air in with a single fuel return. Other configurations and operations are the same as those in the above embodiment.

When the fuel in the reserve tank 11 returns to the main fuel reservoir 1 due to gravity, the smaller the height (that is, the head) h from the reserve tank 11 to the main fuel reservoir 1 is, as shown in FIG. , Fuel return speed becomes slow. Therefore, it is possible to take a sufficient time to return the fuel once, and it is desirable that the head h is small.

[0023]

[Effect of the device]

 As described above, in the case of the vaporization type combustion device of the present invention, the on-off valve is opened to return the fuel in the reserve tank to the main fuel reservoir by gravity, and the air is drawn from the vaporizer to accompany the vaporizer. Since cleaning is possible, desired cleaning can be performed without adding special dynamic equipment. Since the fuel return path is intentionally provided with a flow path resistance and the fuel return time is set to be long, the desired cleaning can be surely performed by one fuel return operation. Further, since it is not necessary to repeatedly supply the fuel to the reserve tank for cleaning and return the fuel from the reserve tank, it is possible to shorten the cleaning time as a result.

[Brief description of drawings]

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

FIG. 2 is a schematic side view around a reserve tank of the vaporization type combustion apparatus proposed by the present applicant.

3 is a schematic side view around the reserve tank of the apparatus of FIG. 1. FIG.

FIG. 4 is a flowchart showing a control operation of the vaporization type combustion device of FIG.

FIG. 5 is a schematic configuration diagram of a vaporization type combustion apparatus according to another embodiment of the present invention.

FIG. 6 is a schematic diagram showing a head related to a fuel return time in the vaporization type combustion device of the present invention.

FIG. 7 is a schematic configuration diagram of a conventional vaporization type combustion device.

[Explanation of symbols]

 1 Main Fuel Reservoir 2 Vaporizer 3 Fuel Supply Pump 4 Fuel Supply Channel (Fuel Supply Pipe) 5 Burner 7 Nozzle 10 Fuel Return Channel (Fuel Return Pipe) 11 Reserve Tank 12 Open / Close Valve 13 Control Device 21 Spiral Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Saito 20, Kotobukicho, Isesaki City, Gunma Sanden Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. Evaporative combustion in which liquid fuel in a main fuel reservoir is fed to a vaporizer by a fuel supply pump, and fuel vaporized in the vaporizer is fed to a burner through a nozzle and burned in the burner. In the device, in the fuel supply path between the fuel supply pump and the carburetor, the bottom is set higher than the oil level of the main fuel reservoir, the reserve tank for holding the fuel is interposed,
The bottom 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, and when the opening / closing valve is opened, the fuel in the reserve tank is returned to the main fuel reservoir by gravity, and The carburetor is configured to be cleaned by drawing air from the carburetor to the reserve tank.
Further, in order to complete the cleaning of the carburetor by one time of drawing in the air, the fuel return passage is provided with a flow passage resistance that makes the fuel return time equal to or more than a certain value. .. 2. The fuel flow return passage is provided with the flow passage resistance by reducing the flow passage diameter of the fuel return passage.
Evaporative combustion device. 3. The vaporization type combustion apparatus according to claim 1, wherein the fuel return path is constituted by a spiral flow path so that the fuel return path has the flow path resistance.