JPH06100323B2 - Liquid fuel combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid fuel combustion apparatus having a cleaning function for removing tar adhering to the inside of a vaporizer.

<Prior Art> Conventionally, a liquid fuel combustion apparatus is vaporized by a vaporizer 4 for vaporizing a fuel 3 delivered from a fuel tank 1 by a pump 2 as a pressure feeding means, as shown in FIG. 6, and the vaporizer 4. The fuel tank 1 and the vaporizer 4 are connected to each other through an oil feed pipe 7, which includes a nozzle 5 for ejecting vaporized fuel and a combustor 6 for burning the vaporized fuel ejected from the nozzle 5. Further, the carburetor 4 is provided with an electromagnetic valve 8 for controlling opening / closing of the tip nozzle 5, and the electromagnetic valve 8 is provided with a relief pipe 9 connected to the fuel tank 1.

Therefore, tar may adhere to the inner surface of the carburetor 4, the vaporization element, the nozzle, etc. due to the use of defective kerosene or the combustion over a long period of time, and this tar may cause combustion failure. is there. At this time, in the cleaning operation for removing the tar adhering to the inside of the vaporizer 4, the vaporizer 4 is heated to a high temperature, the fuel 3 in the fuel tank 1 is removed, and the air in the fuel tank 1 is vaporized by the pump 2. The tar was burned off by pumping it into No. 4 to accelerate the combustion of the tar.

<Problems to be Solved by the Invention> In the above-mentioned conventional technique, if the fuel 3 remains in the fuel tank 1, the fuel 3 flows into the carburetor 4.
It is necessary to drain the fuel 3 in the fuel tank 1.

However, a problem often arises that an appropriate cleaning operation is often not performed due to the troublesome work of removing the fuel.

Therefore, in view of the above, the present invention relates to a liquid fuel combustion apparatus having a cleaning function capable of removing only tar adhering to the inside of the vaporizer by pumping only air into the vaporizer without removing the fuel from the fuel tank. For the purpose of provision.

<Means for Solving the Problems> The means for solving the problems according to the present invention is, as shown in FIGS. 1, 2 and 3, to transfer the fuel 3 inside the fuel tank 1 attached to the combustor 6 into the carburetor 4. A pump 2 for sending is provided, and the pump 2
A fuel pipe 5 is connected to the side of the fuel tank 1, and the fuel pipe 5 is detachably inserted into a pipe connector 16 mounted in an upper opening 17 of the fuel tank 1.
A fuel intake port (10) and a fuel passage (11) communicating the fuel intake port (10) and the end of the fuel pipe (5) are formed, and a part of the fuel passage (11) is used for the fuel (3) in the fuel tank (1). An air intake which is set at a position sufficiently higher than the liquid level, a communication part 12 is formed at that position, and an upper part of the pipe connection body 16 arranged outside the fuel tank 1 communicates with the communication part 12. 13 is provided, and an intake valve 14 is provided to open the air intake 13 during a cleaning operation for removing tar adhering to the inside of the vaporizer 4.

<Operation> In the above problem solving means, when the intake valve 14 is opened during the cleaning operation for removing the tar adhering to the inside of the carburetor 4, the communication portion 12 communicates with the outside air and the pressure in the fuel passage 11 is increased. The pressure becomes the atmospheric pressure and becomes equal to the pressure in the fuel tank 1. At this time, the fuel 3 in the fuel passage 11 is lowered to the same level as the liquid level of the fuel 3 in the fuel tank 1, and when the pump 2 is operated, the fuel passage 11 is introduced from the air intake 13 via the communication portion 12.
The air that has flowed in is sucked from the end of the fuel pipe 5 and sent under pressure into the carburetor 4. Therefore, even if the pump 2 is operated, the fuel 3 in the fuel tank 1 is not sucked up and sent to the carburetor 4, and the fuel 3 in the fuel tank 1 is attached to the carburetor 4 without being removed. The tar can be removed.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front sectional view of a pump section and a fuel tank section showing an embodiment of a liquid fuel combustion apparatus of the present invention, FIG. 2 is a view showing a state in which a fuel pipe and a connecting body are also separated, and FIG. Similarly, a cross-sectional view showing a state where the fuel pipe is attached to the connection body, FIG. 4 is a front cross-sectional view of the pump portion during the normal combustion, and FIG. 5 is a front cross-sectional view of the pump portion during the cleaning operation. The components having the same functions as those of the conventional component shown in FIG. 6 are designated by the same reference numerals.

Then, as shown in the figure, the liquid fuel combustion apparatus of the present invention is provided with an electromagnetic pump 2 for feeding the fuel 3 inside the fuel tank 1 attached to the combustor 6 into the carburetor 4, and the fuel of the pump 2 is provided. A fuel pipe 5 is connected to the tank 1 side, and a fuel passage 11 from the fuel pipe 5 to a fuel intake 10 in the fuel tank 1 is formed, and a part of the fuel passage 11 is formed in the fuel tank 1.
It is set at a position higher than the liquid level of the fuel 3 inside, and a connecting portion 12 is formed at that position, and air is supplied to the connecting portion 12 by the fuel pipe 5.
Is provided with an air intake port 13 for supplying the vaporizer 4 to the vaporizer 4, and an intake valve 14 is provided for opening the air intake port 13 during a cleaning operation for removing tar adhering to the inside of the vaporizer 4. .

The fuel tank 1 is arranged in the lower part of the main body of the combustion apparatus, and a float switch 15 for detecting the remaining amount of the fuel 3 and a pipe connection body 16 for detachably inserting the fuel pipe 5 are mounted on the upper surface of the fuel tank 1. Has been done. The pipe connector 16 is fixed to the upper opening 17 of the fuel tank 1, and
In addition, the fuel pipe insertion hole 18 formed to have a diameter larger than the diameter of the fuel pipe 5 and the bottom surface closed by the upper surface opening, and the fuel from the upper hole wall 19 of the fuel pipe insertion hole 18 to the lower surface of the pipe connection body 16 An ascending hole 20 is formed. The lower end of the fuel rising hole 20 serves as the fuel intake port 10. The fuel passage
Reference numeral 11 denotes a space formed between the fuel rising hole 20 and the outer peripheral wall of the fuel pipe 5 and the hole wall 21 of the fuel pipe insertion hole 18.
It consists of 11a and.

The communication portion 12 is a portion that communicates with the fuel rising hole 20 above the fuel pipe insertion hole 18. The air intake 13
Is formed on the projecting body 22 of the pipe connection body 16 arranged outside the fuel tank 1, and the air intake port 13 and the communication section 12 are communicated with each other by the air flow path 23. The intake valve 14 is disposed in the air flow path 23. The intake valve 14 includes a valve element 25 made of synthetic rubber that is freely seated on and off a valve seat with a valve hole 24 formed in a part of an air flow path 23, and a solenoid (not shown) fixed to the valve element 25. ) Etc., and a spring 27 for urging the valve element 25 in the closing direction. Also, the insertion hole
A ring-shaped packing 28 for preventing air leakage in the insertion hole 18 when the fuel pipe 5 is inserted is arranged at the upper end of the hole wall of the hole 18.

In the above structure, during normal combustion, the intake valve 14 is closed as shown in FIG. First, it is assumed that there is no fuel 3 in the pipe connector 16. Portions other than the fuel intake port 10 are in a sealed state, and when the pump 2 operates, the insertion hole of the pipe connector 16
The internal pressure P2 of 18 becomes lower than the pressure P1 in the fuel tank 1 (P2 <P1). Therefore, the fuel 3 flows in from the fuel intake port 10, rises up to the communication portion 12 and accumulates in the insertion hole 18, and if the fuel accumulates to the height of the fuel intake port of the fuel pipe 5, the fuel is pumped by the pump 2. Can be sucked up and sent to the vaporizer 4. When the pump 2 starts sucking up the fuel, the internal pressure P2 in the sealed pipe connector 16 is constant, so the amount of fuel in the pipe connector 16 is always constant, and the liquid level of the fuel in the pipe connector 16 is constant. Is balanced at the suction port of the fuel pipe 5, and the fuel 3 in the fuel passage 11 of the pipe connector 16 is balanced at the same liquid level as the height of the connecting portion 12.

Next, during the cleaning operation, as shown in FIG.
Is opened, the internal pressure P2 of the insertion hole 18 of the pipe connector 16 is
Becomes the same as the internal pressure P1 of the fuel tank 1 (P1 = P2).
Then, since the internal pressure P2 and the external pressure P3 are the same at the liquid level in the fuel passage 11 which is in equilibrium at the communication portion 12 because of P2 <P1, the inside of the fuel tank 1 is The liquid level is lowered to the same level. At this time, since the height of the position of the connecting portion 12 is sufficiently higher than the liquid level in the fuel tank 1, the fuel does not flow into the pipe connecting body 16.

When the pump 2 is operated in this state, it is possible to suck up a small amount of fuel accumulated in the pipe connection body 16 and then suck up the air flowing in from the air intake 13. At this time, since the air flows from the air inlet 13, the internal pressure P2 of the pipe connection body is always the same as the external pressure P3. Therefore, the fuel level in the fuel passage 11 is higher than that in the fuel tank 1. It never gets higher.

At this time, a small amount of fuel accumulated in the pipe connection body 16 is sent to the carburetor before starting the pressure feeding of air at the time of cleaning, but since it is a small amount, it does not affect the cleaning effect.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the fuel passage is not limited to the inverted U-shaped one as in the above embodiment, but may be a straight pipe. Further, the fuel passage may not be integrally formed with the connection body. Further, the pump is not limited to the electromagnetic pump.

<Effects of the Invention> As is apparent from the above description, according to the present invention, a part of the fuel passage that communicates the end of the fuel pipe connected to the pump and the fuel intake is connected to the liquid of the fuel in the fuel tank. Since it is set at a position sufficiently higher than the surface and the communication part formed at this position and the air intake are in communication, if the intake valve provided at the air intake is opened during the cleaning operation, the inside of the fuel tank It is possible to remove the tar adhering to the inside of the vaporizer by pumping only air into the vaporizer without removing the fuel.

Further, since the fuel pipe connected to the pump is detachably inserted into the pipe connecting body and the air intake is provided above the pipe connecting body arranged outside the fuel tank, the pipe connecting body is connected to the fuel tank. Just attach it to the top opening of
Standard and ready-made pumps and fuel pipes can be used as they are, and it is not necessary to form an opening or the like for taking in air on the upper surface of the fuel tank. Therefore, the assembly work of the device can be easily performed, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front sectional view of a pump section and a fuel tank section showing an embodiment of a liquid fuel combustion apparatus of the present invention, FIG. 2 is a view showing a state in which a fuel pipe and a connecting body are also separated, and FIG. Similarly, a cross-sectional view showing a state where the fuel pipe is attached to the connection body, FIG. 4 is a front cross-sectional view of the pump portion during the normal combustion, and FIG. 5 is a front cross-sectional view of the pump portion during the cleaning operation, and FIG. FIG. 3 is a configuration diagram of a conventional liquid fuel combustion device. 1: Fuel tank, 2: Pump, 3: Fuel, 4: Vaporizer, 5: Fuel pipe, 6: Combustor, 10: Fuel intake port, 11: Fuel passage, 12: Communication part, 13: Air intake port, 14: Intake valve.

Claims (1)

[Claims] 1. A pump for feeding fuel inside a fuel tank attached to a combustor into a carburetor is provided, a fuel pipe is connected to a fuel tank side of the pump, and the fuel pipe is the fuel tank. Is removably inserted into a pipe connecting body attached to an upper surface opening of the pipe connecting body, and the pipe connecting body is formed with a fuel intake port and a fuel passage communicating with the fuel intake port and an end of the fuel pipe. A part of the fuel passage is set at a position sufficiently higher than the liquid level of the fuel in the fuel tank,
A communication part is formed at the position, and an air intake communicating with the communication part is provided on the upper part of the pipe connection body arranged outside the fuel tank to remove tar attached to the carburetor. A liquid fuel combustion apparatus comprising an intake valve that opens the air intake port during a cleaning operation.