JP2575194Y2 - Vaporization type combustion device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasification type combustion apparatus for mainly burning kerosene as a petroleum fuel.

[0002]

2. Description of the Related Art A vaporizer for vaporizing a petroleum-based fuel, a supply path having a pump for supplying the petroleum-based fuel to the vaporizer, and a burner for burning a vaporized gas which is vaporized by the vaporizer and injected from a nozzle. And a shut-off valve that shuts off vaporized gas from the nozzle in response to the fire extinguishing operation, and a return valve that opens in response to the fire extinguishing operation
There is known a vaporization-type combustion apparatus that includes a return path with a valve interposed therebetween and returns residual fuel remaining on the carburetor side to the fuel tank via the return path. If it remains, it may tar and become clogged in the vaporizer. In order to solve such a problem, there is also known a method in which air is pumped into a carburetor at the end of combustion to push out fuel in the carburetor (Japanese Utility Model Laid-Open No. 3-790).
No. 13).

[0003]

However, in this vaporization type combustion apparatus, since air acts on the heated petroleum-based fuel in the vaporizer, the petroleum-based fuel is oxidized and polymerized in the vaporizer to produce carbon. -Tar becomes clogged in the vaporizer and the amount of vaporized gas decreases, causing poor combustion.

[0004] It is an object of the present invention to obtain a vaporized combustion device free of such a problem.

[0005]

According to the present invention, there is provided a vaporizer for vaporizing petroleum-based fuel, a supply path having a pump for supplying petroleum-based fuel to the vaporizer, and a burner for burning the vaporized gas ejected from the nozzle and vaporized in the vaporizer, the return path is interposed a shut-off valve cutting off the flow of the vaporized gas, the return valve opens in response to extinguishing operation from the nozzle in response to the fire extinguishing operation Wherein the residual fuel remaining on the carburetor side via the return path is returned to the fuel tank, and the pump interposed in the supply path continues to operate for a certain time after the fire extinguishing operation I did it. It is more preferable to provide a cooling means for cooling the return path.

[0006]

In the vaporization type combustion apparatus having the above-described structure, if the shut-off valve is closed and the return valve is opened by the fire extinguishing operation, the petroleum system which returns from the fuel tank to the fuel tank through the supply path, the carburetor and the return path, and returns to the fuel tank. A fuel circulation path is formed.
Therefore, if the pump interposed in the supply path continues to operate for a certain period of time even after the fire extinguishing operation, the petroleum-based fuel circulates in the circulation path, and the temperature of the fuel remaining in the vaporizer due to the low-temperature fuel in the fuel tank. By extruding the high fuel to the fuel tank side, after the fire extinguishing operation, the high temperature petroleum-based fuel does not stay in the carburetor and the temperature of the carburetor can be lowered.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the drawing, reference numeral 1 denotes a burner.
The mixing tube 4 is provided on the side surface of the burner main body 3 provided with a mixing tube. Reference numeral 5 denotes a valve housing having a nozzle 6 at an end thereof opposed to the opening of the mixing pipe 4. The valve housing 5 is opened when an ignition operation is performed to supply fuel to the nozzle 6 and to perform a fire extinguishing operation. And a shut-off valve 7 for cutting off the supply of fuel to the nozzle 6. The shut-off valve
7 is formed by the tip of a valve rod provided in the valve housing 5. Reference numeral 8 denotes a vaporizer provided with an electric heater (not shown) supported by the valve housing 5 and having the inside thereof communicated with the valve housing 5, and the vaporized gas vaporized by the vaporizer 8 is supplied from the nozzle 6 to the mixing pipe 4. is jetted toward the draws more air in injector effect this time to the mixing tube 4, fed into the burner body 3 by mixing vaporized gas and air in the mixing tube within 4, it burned in the combustion section 2.

Reference numeral 9 denotes a supply path for supplying petroleum-based fuel to the carburetor 8. The supply path 9 is configured by interposing a pump 11 in the middle of a fuel supply pipe 9 a rising from a fuel tank 10.

Reference numeral 12 denotes a return path for returning fuel on the carburetor 8 side to the fuel tank 10 side with a return valve 13 interposed therebetween in response to a fire extinguishing operation, and the return path 12 is shown in FIG. And a return pipe 12b connected to the latter half 12a.

The return valve 13 opens in response to the fire extinguishing operation.
It was then formed in the rear end of the front Stories valve stem.

The shutoff valve 7 and the return valve 13 are electromagnetic valves that are opened and closed by a solenoid 14.

In the present invention, the supply passage 9 is provided.
And a cooling means 15 for cooling the return path 12, and a cooling fan 1 serving as the cooling means 15.
5a.

FIG. 2 shows a control circuit. The control circuit includes relays RY1 to RY3 controlled by a timer function of a microcomputer control circuit C connected to the secondary side of the transformer TR, and a timer of the microcomputer control circuit C. The control circuit F of the convection blower (not shown) includes a function and RY4 to RY6 controlled by the operation switch SW. The control circuit F of the pump 11 is connected to the power supply S via the contact ry1 of the relay RY1. And the control circuit FN of the cooling fan 15 connected to the power supply via the contact ry2 of the relay RY2.
It is connected to a power supply S via a contact ry3 of the relay RY3, the control circuit H of vaporization heater interposed vaporizer 8 is connected to a power supply S via a contact RY6 -1 of the relay RY6, ignition of the igniter The control circuit IT of the transformer is a relay R
Is connected to a power supply S via the contact ry5 contact RY6 -1 and relays RY5 of Y6, the control circuit SD of the solenoid 14, the contact RY6 -1 or contact ry of the relay RY6
6-2 and the power supply S via the first contact ry4-1a or the second contact ry4-1b of the relay RY4.

The operation is as shown in the time chart of FIG.

Next, the operation will be described.
Is closed, its contact ry is excited by the excitation of the relay RY6.
The control circuit H of the vaporization heater is energized via 6-1.
For this reason, the vaporizer 8 is heated. Then, after the elapse of a certain time, the contact ry5 is closed by the excitation of the relay RY5. Therefore, the control circuit IT is energized and the relay RY5
Since the relay RY2 is excited with a delay after the excitation, the control circuit P of the pump 11 and the control circuit SD of the solenoid 14 are energized to open the shut-off valve 7 and close the return valve 13. For this reason, the vaporized gas vaporized by the vaporizer 8 is injected from the nozzle 6 toward the mixing pipe 4, and the vaporized gas is injected from the combustion part 2 of the burner 1 and ignites and burns by touching the spark of the igniter. .

At the beginning of the operation of the solenoid 14, since the relay RY3 is in a state of being connected to the first contact ry4-1a, the switching is performed with a large electric power.
-1b, the valve is kept open with weak power.

When a certain period of time has elapsed after ignition, the relay RY5 is demagnetized, so that the contact ry5 opens and the power supply to the control circuit IT of the ignition transformer is released.

When the operation switch SW is opened to extinguish the fire, the excitation of the relays RY4 to RY6 is released, so that the power supply to the vaporization heater H and the solenoid 14 is released. For this reason, the vaporization heater H becomes inactive and is shut off.
Sectional valve 7 is closed, the return valve 13 is opened. However, the pump 11 continues to operate.

Therefore, the petroleum-based fuel circulates in the circulation path. Thus, the high-temperature fuel remaining in the carburetor 8 is extruded toward the fuel tank 10 by the low-temperature fuel in the tank 10. Moreover, the petroleum-based fuel is cooled by the cooling means when flowing through the return path 12.

When a certain period of time has elapsed after the extinguishing operation, the relays RY2 and RY3 are demagnetized, and the pump 11 stops.

The relay RY1 is demagnetized after a heat exchanger (not shown) connected to the burner 1 is completely cooled. Thereby, the convection blower (not shown) stops.

As shown in FIG. 1, the cooling means 15 is provided with fins 12b-1 on the return pipe 12b and the entire return path 12 is provided with a casing for ensuring the cooling effect of the cooling fan 15a as the cooling means 15. 18 and cover 1
The fan 15a is connected to one end of the housing 8, and an exhaust port 17 is provided at the other end of the housing 18, so that the air from the fan 15a cools the entire return path 12 by air.

However, as shown in FIG. 4, the return pipe 12b is provided with the fins 12b-1 and the return pipe 12b-1.
b, the air from the fan 15a may be applied to air-cool only a part of the return path 12. Further, as shown in FIG. A fin 19a may be provided on the outer periphery of the cylindrical portion 19, and the air from the fan 15a may be applied to the cylindrical portion 19 to air-cool only the cylindrical portion 19.

The fuel tank 10 is constituted by an oil leveler which can always keep the oil level constant.
0 is always supplied with fuel from a source tank (not shown) using a head.

Although the fan 15a is operated for a fixed time after the fire is extinguished, it may be operated during the combustion of the burner 1 and for a fixed time after the fire is extinguished.

[0026]

According to the present invention, the following effects can be obtained in the vaporization type combustion apparatus having the above-described structure. It is very simple to keep the pump interposed in the supply path running for a certain period of time after the fire extinguishing operation.The low-temperature fuel in the fuel tank pushes the high-temperature fuel remaining in the vaporizer to the fuel tank side. Thus, by replacing the fuel in the carburetor with the fuel in the fuel tank, the temperature of the fuel in the carburetor can be reduced. For this reason, it is possible to prevent the fuel from being tarred in the carburetor, and there is no inconvenience of the conventional type in which fuel is pushed out with air.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an operation circuit diagram thereof.

FIG. 3 is a time chart.

FIG. 4 is a side view showing a modification of FIG. 1;

FIG. 5 is a side view showing still another modified example.

[Explanation of symbols]

1 burner 6 nozzle 7 shutoff valve 8 vaporizer 9 supply passage 10 the fuel tank 12 return path 13 back Shi valve 15 cooling means

Claims (2)

(57) [Scope of request for utility model registration] 1. A vaporizer for vaporizing a petroleum-based fuel, a supply path including a pump for supplying the petroleum-based fuel to the vaporizer, and a burner for vaporizing the vaporizer and burning a vaporized gas injected from a nozzle. A shut-off valve that cuts out the vaporized gas from the nozzle in response to the fire extinguishing operation, and a return path interposed with a return valve that opens in response to the fire extinguishing operation, and remains on the carburetor side through the return path. A vaporization type combustion apparatus in which residual fuel is returned to a fuel tank, wherein a pump interposed in the supply path is operated for a predetermined time after a fire extinguishing operation. 2. The evaporative combustion apparatus according to claim 1, further comprising cooling means for cooling the return path.