JPH0655034U - Evaporative combustion device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent unnecessary reset operation of the fuel reservoir while ensuring efficient cleaning operation of the carburetor. In a device in which a reserve tank 11 is provided in a fuel supply path 4 between a fuel supply pump 3 and a carburetor 2,
A vaporization type combustion device in which a sub tank 20 is provided in a fuel return path from the reserve tank 11 to the main fuel reservoir 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 path to a vaporizer.

[0002]

[Prior art]

 As a vaporization type combustion device that can clean the inside of the vaporizer at the time of fire extinguishing or timely (for example, seasonal) cleaning of the vaporizer, a fuel supply path from the fuel reservoir to the vaporizer It is known that a fuel pump and a fuel reservoir are connected by 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 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 the application has not yet been published, the fuel supply pipe between the fuel supply pump 21 and the carburetor 22 is shown in FIG. 6 by the applicant. A vaporization-type combustion apparatus has been proposed in which a reserve tank 24 for temporarily holding fuel in 23 is interposed, and a bottom portion of the reserve tank 24 is connected to a main fuel storage 26 by a fuel return pipe 25.

In this device, the on-off valve 27, which is an electromagnetic valve provided in the fuel return pipe 25, is opened at the time of extinguishing the fire so that the fuel in the reserve tank 24 is gravity-fed, that is, falls naturally into the main fuel reservoir 26. Since the air is drawn back from the carburetor 22 and the residual gas in the carburetor 22 is sucked to clean the carburetor 22 in association with this, power equipment for cleaning is not required and the efficiency is improved. The vaporizer 22 can be cleaned.

[0005]

[Problems to be solved by the device]

 In the above proposed device, the main fuel reservoir 26 uses a constant oil leveler capable of controlling the oil level at a constant level. The constant oil leveler usually has a reset position as the upper limit level of the oil level. It is set. However, if all of the fuel in the reserve tank 24 is temporarily returned to the main fuel reservoir 26 at the time of fire extinguishment, it may exceed the reset position of the main fuel reservoir 26 in some cases, and the reset function may be unnecessary. There was a risk of operating it.

The present invention is intended to improve the above-proposed device in order to eliminate such a fear, and provides a reserve tank to efficiently clean the carburetor and at the same time The purpose is to prevent the reset function of the main fuel reservoir from operating unnecessarily due to the fuel falling from the tank.

[0007]

[Means for Solving the Problems]

 The vaporization type combustion device of the present invention which meets this purpose is configured so that the liquid fuel in the main fuel reservoir is fed to the vaporizer by a fuel supply pump through a reserve tank for temporarily holding the fuel, and the vaporizer The fuel vaporized at is sent 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, and an on-off valve is provided in the fuel return path. In the vaporization type combustion device, a sub-tank is provided in the fuel return path between the on-off valve and the main fuel reservoir to temporarily drop the fuel dropped from the reserve tank and drop it into the main fuel reservoir. It consists of

[0008]

[Action]

 In such a vaporization type combustion device, when the fuel supply pump is stopped and the on-off valve is opened at the time of fire extinguishing, the liquid fuel in the reserve tank falls into the sub tank due to gravity and is temporarily stored. Returned to main fuel reservoir. By providing a sub tank in this way so that a part of the dropped fuel is temporarily stored in the sub tank, fuel is stored in the sub tank even when the reserve tank is empty. It is possible to create the condition that is being done.

In this state, by closing the opening / closing valve located above the sub tank, the upper space inside the sub tank can be formed as a closed space, and the drop of fuel from the sub tank to the main fuel reservoir can be temporarily stopped.

Therefore, even if the fuel in the reserve tank is returned to the main fuel reservoir all at once, even if it exceeds the reset position, which is the upper limit of the oil level of the main fuel reservoir, the amount of fuel dropped from the reserve tank A part of the fuel can be temporarily stored in the sub-tank, and the oil level rise in the main fuel reservoir that is stored in the sub-tank can be suppressed.

Even if the fuel is stored in the sub tank, the fuel in the reserve tank is dropped until it becomes empty, so that the air is sucked from the nozzle of the carburetor as the fuel falls and the fuel inside the carburetor is removed. Residual gas is drawn into the reserve tank together with the air and collected. Therefore, the cleaning action of the carburetor due to the intake of air is secured as it is.

At the time of ignition, the fuel supply pump is operated, and when the oil level of the main fuel reservoir is lowered by the fuel supply by the pump, the lower open end of the fuel return passage from the sub tank and the lowered oil level. A gap is created between the surface and the surface, air enters from this portion, the above-mentioned closed structure collapses, and the fuel stored in the sub-tank flows into the main fuel reservoir.

Due to this fuel drop, the oil level in the main fuel reservoir begins to rise, and when it rises again to the level of the lower open end of the fuel return path from the sub-tank, the above-mentioned sealed structure again occurs. By repeating such an operation, the fuel in the sub-tank is eventually returned to the main fuel reservoir so that the empty sub-tank is ready for the next fire extinguishing and cleaning operations.

[0014]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 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 always adjusted to be constant. 2 is a vaporizer for vaporizing liquid fuel, 3 is an electromagnetic 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, 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. Has been done. The reserve tank 11 is connected to the main fuel reservoir 1 by a fuel return passage having an on-off valve 12, and a sub-tank 20 is provided below the on-off valve 12 on the fuel return passage.

That is, the bottom portion of the reserve tank 11 is connected to the top portion of the sub tank 20 by the fuel return pipe 10 a (fuel return passage) having the opening / closing valve 12. The bottom of the sub-tank 20 is connected to the main fuel reservoir 1 by a fuel return pipe 10b (fuel return passage) whose lower end is an open end. Further, an air introducing pipe 19 capable of introducing air into the upper space of the sub tank 20 is connected to the upper part of the sub tank 20, and another end of the air introducing pipe 19 is opened to the main fuel reservoir 1. There is. The lower open end of each of the fuel return pipe 10b (fuel return passage) and the air introduction pipe 19 is located above the constant oil level position A and below the reset position D as the oil level upper limit C. The level is set to (operating position).

The pipe diameter d2 of the fuel return pipe 10b is smaller than the pipe diameter d ₁ of the fuel return pipe 10a. Further, the lower end portion of the air introduction pipe 19 is formed in the expanded diameter portion 19a.

Reference numeral 13 denotes a control device, and the temperature detection signal of the carburetor 2 is sent from the thermistor 8 to the control device 13. Further, the control device 13 controls heating, opening and 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. When the fuel supply pump 3 is stopped and the opening / closing valve 12 is opened at the time of extinguishing a fire, the liquid fuel in the reserve tank 11 as shown in FIG. It flows into the sub tank 20 through the fuel return pipe 10a. As shown in FIG. 5, this operation is continued for a sufficient time t and minutes (t ₁ −t ₀ ) to empty the reserve tank 11, and then the on-off valve 12 is closed.

The liquid fuel further drops and flows into the main fuel reservoir 1 through the fuel return pipe 10b, and raises the oil level position B as shown by the white arrow. At this time, since the diameter d ₂ of the fuel return pipe 10b is set to be smaller than the diameter d _{1 of the} fuel return pipe 10a, the liquid fuel flowing into the reserve tank 11 → the sub tank 20 → the main fuel reservoir 1 Are temporarily stored in the sub tank 20.

When the total amount of fuel in the reserve tank 11 falls to the sub-tank 20 side, that is, when the reserve tank 11 becomes empty, the open / close valve 12 is closed. When liquid fuel flows from the sub tank 20 into the main fuel storage 1 with the on-off valve 12 closed, the oil level position B further rises and reaches the operating position C (B = C), as shown in FIG. Then, the oil level B reaches the level of the lower open end of the air introduction pipe 19, the upper space in the sub-tank 20 has a closed structure, and the drop of fuel into the main fuel reservoir 1 is temporarily stopped. Then the state shown in Fig. 3 is obtained. That is, according to the device of the present invention, when the oil level position B rises up to the operating position C, the fuel drop from the sub tank 20 is substantially stopped.

Therefore, it is possible to surely prevent the oil level position B from rising to the reset position C when the fire is extinguished and the unnecessary reset function is activated.

When the fuel supply pump 3 is operated at the time of ignition or the like, the fuel level is supplied to the reserve tank 11 side by the pump 3 and the oil level position B begins to descend as shown by the white arrow in FIG. The sealed structure is released. As a result, the lower open end of the air introduction pipe 19 is opened, air is introduced from there, and the fuel in the sub tank 20 again begins to drop through the fuel return pipe 10b. That is, since air flows into the sub tank 20 from the lower open end of the air introduction pipe 19 as indicated by the one-dot chain line arrow, the fuel drop from the sub tank 20 is promoted.

By continuing the fuel supply by the fuel supply pump 3, the above-mentioned operation is repeated, and the fuel in the sub-tank 20 is completely returned to the main fuel reservoir 1 in due course. Then, the initial state, that is, the sub-tank 20 is emptied, and prepared for the next fire extinguishing and cleaning operations.

In the drawings showing the apparatus of the above embodiment, the level of the lower open end of the fuel return pipe 10b is shown according to the level of the lower open end of the air introduction pipe 19, but the fuel return pipe The level of the lower open end of 10b may be above or below the level of the lower open end of the air inlet tube 19.

[0026]

[Effect of device]

 As described above, in the case of the vaporization type combustion device of the present invention, since the sub-tank for temporarily dropping the fuel falling from the reserve tank and dropping it to the main fuel reservoir is provided, the fuel is the main fuel when extinguishing fire. When returning to the inside of the reservoir, the reset function can be prevented from being operated unnecessarily, and the cleaning of the carburetor can maintain the same good function as the vaporized combustion device proposed above.

[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 partially enlarged view showing a fuel return when the device of FIG. 1 is extinguished.

FIG. 3 is a partially enlarged view showing a sealed state in a sub tank of the apparatus shown in FIG.

FIG. 4 is a partially enlarged view showing the flow of fuel at the time of ignition of the device of FIG.

5 is a time chart showing the opening / closing operation of the on-off valve when the device of FIG. 1 is extinguished.

FIG. 6 is a schematic configuration diagram of a conventional device.

[Explanation of symbols]

 1 Main Fuel Reservoir 2 Vaporizer 3 Fuel Supply Pump 4 Fuel Supply Pipe (Fuel Supply Channel) 5 Burner 6 Heater 7 Nozzle 8 Thermistor 10a Fuel Return Pipe (Fuel Return Channel) 10b Fuel Return Pipe (Fuel Return Channel) 11 Reserve Tank 12 Open / close valve 13 Control device 14 Drive device 19 Air introduction pipe 20 Sub tank

Front page continuation (72) Creator Yasushi Saito 20 Kotobukicho, Isesaki City, Gunma Sanden Co., Ltd.

Claims (5)

[Scope of utility model registration request] 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 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, the fuel is returned to the burner. A vaporization-type combustion apparatus, characterized in that a sub-tank is provided between the on-off valve and the main fuel reservoir, and the sub-tank is provided between the on-off valve and the main fuel reservoir to drop the fuel from the reserve tank into the main fuel reservoir while temporarily storing the fuel. 2. The main fuel reservoir is configured as a constant oil level device capable of controlling the oil level to a constant level, and is reset as an upper limit of the oil level above the constant oil level position of the main fuel reservoir. The vaporization type combustion apparatus according to claim 1, wherein a position is set and a position of a lower open end of the fuel return path from the sub tank to the main fuel reservoir is set between the constant oil level position and the reset position. 3. An air introducing pipe capable of introducing air into an upper space in the sub tank is connected to an upper portion of the sub tank,
The vaporization combustion apparatus according to claim 2, wherein the other open end of the air introduction pipe is located between the constant oil level position and the reset position in the main fuel reservoir. 4. The vaporization type combustion device according to claim 1, wherein a diameter of a fuel return passage below the sub tank is smaller than a diameter of a fuel return passage between the reserve tank and the sub tank. . 5. The vaporization type combustion device according to claim 3, wherein a lower end portion of the air introduction pipe is formed in a diameter-expanded portion.