JPH10253043A - Oil supply device of oil combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply structure which stabilizes a combustion state of an air supply and exhaust type oil combustor. SOLUTION: A burner 1 and a heat exchanger, which are set up inside a frame member of an oil combustor are connected to an air supply and exhaust top which communicates with outdoors by way of an air supply cylinder and an exhaust air cylinder while a combustion fan takes in air from the air supply and exhaust top and supplies the air to the burner. In addition, a fuel pipe 9, which is mounted with a fuel pump, which supplies a fuel of an oil tank 7 to the burner 1, is provided and arranged to run in a downward slope from a high elevation 9a of the fuel pipe 9 which connects the fuel pump 8 to the burner 1 until the burner 1. An enclosed space 10 is provided, which communicates with the oil tank 7 with a communication area 10a under the oil surface. The enclosed space 10 connects a pressure pipe 12 whose one end is connected to the air supply side of the burner 1 and is opened to the atmosphere and an air pipe 11 whose one end is connected to the high elevation 9a of the fuel pipe 9 and provided with the highest area 11 on the way. A damper 13 is mounted on the communication area with the oil tank 7 of the enclosed space 10, thereby making foams finer in size which are removed from the commutation area 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply structure for stabilizing the combustion state of an intake / exhaust type oil combustor.

[0002]

2. Description of the Related Art In an oil combustor provided with a heat exchanger,
There is an intake / exhaust type combustor which exhausts combustion exhaust gas to the outside of a room and supplies fresh air outside of the room to a burner for combustion. This type of combustor is very sanitary because indoor air is not used for combustion, and has the feature that there is no danger of indoor pollution due to exhaust gas even if the combustor is used for a long time.

By the way, when air is blown to the intake / exhaust top of the intake / exhaust type combustor, both the exhaust side and the supply side are pressurized together, so that the combustion fan provided in the flow path from the supply cylinder to the exhaust cylinder is provided. Can maintain a predetermined amount of air irrespective of fluctuations in the internal pressure of the burner. In addition, in recent oil combustors, instead of a structure in which fuel is supplied at a differential pressure, a method of forcibly supplying fuel by an electromagnetic pump has been generally used because of easy control of fuel flow rate. In the supply method, the fuel is pumped, so that even if the internal pressure of the burner fluctuates, the expected fuel flow rate can be maintained and a stable combustion state can be obtained.

[0004]

As described above, the structure in which the fuel is pumped by the fuel pump as described above does not cause an imbalance between the air amount and the fuel in the combustion at the time of normal combustion, and enables stable combustion. . However, if the fuel is shut off during fire extinguishing, part of the fuel remains in the fuel pipe, and this fuel receives the heat of the burner after fire extinguishing and is vaporized in the fuel pipe and sent out to the burner. Even if combustion could occur, the amount of air and fuel did not match, causing incomplete combustion.

[0005] For this reason, incomplete combustion gas with a bad smell is released from the top of the intake and exhaust at the time of fire extinguishing. However, since this gas does not deteriorate the indoor environment and is a short time, special measures are taken. At this time, those who passed near the top of the air intake / exhaust system at the time were very annoying due to the odor at the time of fire extinguishing.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and includes a burner 1 for burning oil fuel, a heat exchanger 2 communicating with the burner 1 and exchanging heat with indoor air.
An intake / exhaust top 5 in which an air supply cylinder 3 is connected to the burner 1 and an exhaust pipe 4 is connected to the heat exchanger 2;
And a fuel pipe 9 for supplying fuel from an oil tank 7 to the burner 1 by a fuel pump 8.
From the high point 9a of the fuel pipe 9 connecting the fuel pump 8 and the burner 1 to the burner 1, a downward slope is provided, and
A closed space 10 is formed in the oil tank 7 at a communication portion 10 a below the oil level of the oil tank 7, and an air pipe 11 is provided to connect the closed space 10 and a high point 9 a of the fuel pipe 9.
The air pipe 11 is provided with a highest portion 11 a higher than the high point 9 a of the fuel pipe 9, and the closed space 10 is connected to a pressure pipe 12 communicating with the air supply side of the burner 1.

When the air supply side of the burner 1 and the closed space 10 are communicated with each other by the pressure pipe 12, the oil level of the closed space 10 drops when a strong pressure is applied, and air is discharged from the communication portion 10a. In the present invention, the cushioning material 13 made of fibers or open cells is provided in the communication portion 10a between the closed space 10 and the oil tank 7 in some cases.
Is attached, the air escaping from the communication portion 10a does not splash and scatter due to the function of the cushioning material 13.

Further, when the cushioning material 13 is in the oil, air bubbles passing through the cushioning material 13 may splash fuel when floating on the oil surface.
At the oil tank 7 side of the communication portion 10a connecting the oil tank 7 to the inside of the oil tank 7, a buffer material 13 made of fiber or open air bubbles is attached. Since the air reached the space above the surface, the air escaping into the upper space of the oil tank 7 came to pass through the cushioning material 13.

[0009]

According to the present invention, the high point 9a of the fuel pipe 9 is set to the atmospheric pressure, and the fuel pipe 9 from the high point 9 to the burner 1 is inclined downward. The fuel quickly flows from the place 9a to the burner 1 to complete the combustion. When the combustion is stopped, there is no fuel in the fuel pipe 9, and the incomplete combustion accompanied by the odor after the fire extinguishing operation does not occur.

Also, during operation of the oil combustor, the fuel pipe 9
When tar clogging occurs, fuel is returned from the air pipe 11 to the closed space 10 of the oil tank 7 so that the fuel does not leak to the outside, while the closed space 10 is supplied by the pressure pipe 12 to the burner 1. Since the air is connected to the air side, when the wind blows to the intake / exhaust top 5, the pressure at the high point 9a of the fuel pipe 9 also increases, and as a result, the burner 1 and the high point 9a maintain substantially the same pressure and the fuel continues. It flows to the burner 1 and can maintain stable combustion while maintaining the balance between air and fuel.

Further, when wind pressure is applied to the closed space 10, the oil level of the closed space 10 is pushed down, and air may escape into the oil of the oil tank 7. In this case, the oil tank 7 is greatly waved and splashes are generated. In some cases, the oil splatters and causes oil bleeding to the outside of the upper surface of the oil tank 7. However, the cushioning material 13 of the present invention changes the air escaping from the communication portion 10a into bubbles, so that the oil tank 7 hardly undulates, Oil droplets no longer adhere to the back surface of the upper plate of the oil tank 7.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment of an oil combustor shown in the drawing. 1 is a burner of an oil combustor using petroleum fuel, 14 is an air supply passage provided outside the burner 1, 2.
Is a heat exchanger arranged above the burner 1 to exchange heat with room air, and 5 is a suction / exhaust top mounted on a wall 15 for partitioning between indoor and outside. Reference numeral 3 denotes an air supply cylinder connecting the intake / exhaust top 5 to the air supply passage 14 of the burner 1, reference numeral 4 denotes an exhaust cylinder connecting the outlet of the heat exchanger 2 to the intake / exhaust top 5, and reference numeral 6 denotes an air supply cylinder 3 or an exhaust cylinder 4. Is a combustion convection fan mounted on the back of the heat exchanger 2.

The burner 1 of the embodiment is a pot type burner, and has a large number of air holes 1a formed in the side wall of the burner.
When the combustion fan 6 rotates, the outdoor air taken in from the intake / exhaust top 5 is supplied to the burner 1 from the air supply passage 14 through the air hole 1a, and the combustion exhaust gas generated by the burner 1 is supplied to the heat exchanger 2 During the passage, the indoor air sent by the indoor convection fan 16 is heated, and the radiated combustion exhaust gas is sent from the exhaust pipe 4 to the intake / exhaust top 5 to be exhausted outside the room.

Numeral 7 denotes an oil tank, numeral 17 denotes a pan mounted on the upper plate of the oil tank 7, numeral 18 denotes a cartridge tank which is inserted into and mounted on the lubrication port with valve.
, The same amount of fuel as the used fuel is supplied from the cartridge tank 18, and the oil tank 7 always keeps a substantially constant oil level. Reference numeral 9 denotes a fuel pipe connecting the oil tank 7 and the burner 1, and reference numeral 8 denotes a fuel pump provided at an appropriate position of the fuel pipe 9, and the fuel pump 8 works with the combustion fan 6 to balance the flow rates of the fuel and air. 1 and completely burned by the burner 1.

In the intake / exhaust type oil combustor having the pot type burner 1, 9a is the highest point in the fuel pipe 9 from the fuel pump 8 to the burner 1, and 9a is the highest point. The fuel pipes 9 up to the burner 1 are all set downhill.

10 is a closed space installed in the oil tank 7,
12 is a pressure pipe for making the inside of the closed space 10 the atmospheric pressure, 11
Are air pipes connected to the closed space 10 and the high places 9a, 1
Reference numeral 1a denotes a highest portion where the middle of the air pipe 11 is positioned higher than the high point 9a. When the fuel pump 8 operates, the fuel in the oil tank 7 is sent to the high point 9a, and the air pipe 11 has the highest portion 11a. Therefore, the fuel is supplied to the burner 1
It flows toward. For this reason, even if the fuel pump 8 is stopped by the fire extinguishing operation, the fuel on the side of the burner 1 from the high place 9a is continuously sent to the burner 1 and burns, and almost completely burns until the fire is extinguished. The emission of offensive odor was able to be stopped from the exhaust top 5.

10a is a lower portion of the closed space 10 and an oil tank 7
The communication portion 13 which communicates with the inside of the oil is a buffer material attached to the communication portion 10a. The buffer material 13 is formed of a material of fibers or open cells so that fuel and air can pass freely. Therefore, if the fuel pipe 9 is blocked by the tar while the fuel pump 8 is operating, the fuel flows from the high place 9a to the air pipe 11
Flows into the closed space 10 through the highest portion 11a and is returned to the oil tank 7 from the communicating portion 10a. Therefore, even in a structure in which the atmospheric pressure is applied to the high place 9a, the fuel may leak to the outside in an emergency. There is no.

The end of the pressure pipe 12 connected to the closed space 10 is connected to the air supply side of the burner 1 and
The inside of the closed space 10 is set to the atmospheric pressure by communicating with the outside air. Therefore, when the internal pressure of the burner 1 increases due to the wind pressure applied to the intake / exhaust top 5, the fuel to flow to the burner 1 tends to temporarily flow toward the air pipe 11. 10 and the fuel pipe 9 via the air pipe 11, the fuel also faces the high point 9 a, which is opposed to the fuel that is going to enter the air pipe 11. Therefore, even if wind pressure is applied to the intake / exhaust top 5, the fuel continues to burner. After flowing to 1, there is no change in the flow rate.

When a strong wind blows to the intake / exhaust top 5, the wind pressure is directly applied to the closed space 10 via the pressure pipe 12. In the present invention, since the cushioning material 13 is provided in the communication portion 10a of the sealed space 10 as described above, when the oil level of the sealed space 10 lowers due to the wind pressure of the pressure pipe 12, the air flows out of the communication portion 10a to the oil tank 7, The air that has passed through the cushioning material 13 becomes fine bubbles and floats on the oil surface of the oil tank 7, so that the air does not greatly wave.

If the cushioning material 13 reaches the space above the oil level while closely contacting the outside of the closed space 10 as in the embodiment, the air that escapes from the communication portion 10a passes directly through the cushioning material 13 to the oil. Since the oil escapes into the air above the surface, it is possible to completely prevent the oil surface of the oil tank 7 from waving, and no oil droplets adhere to the back surface of the upper plate of the oil tank 7.

[0021]

As described above, according to the present invention, the fuel pipe 9
Since the high point 9a is set to the atmospheric pressure and the slope is lowered from the high point 9a to the burner 1, the fuel pumped by the fuel pump 8 at the time of extinguishing does not remain in the fuel pipe 9 from the high point 9a toward the burner 1, and the fire extinguishing. The burner 1 at the time burns the fuel remaining in the fuel pipe 9 and then extinguishes the fuel. When the combustion stops, there is no fuel in the fuel pipe 9 and incomplete combustion with a bad smell does not occur after the fire extinguishing operation. It was possible to prevent the generation of offensive odor from the intake / exhaust top 5.

If the high point 9a of the fuel pipe 9 is opened to the atmosphere, if tar clogging occurs at the tip of the fuel pipe 9, fuel may overflow to the outside. According to the present invention, a closed space 10 which is open to the atmosphere by a pressure pipe 12 while communicating with the oil in the oil tank 7 is formed, and the closed space 10 and a high point 9a of the fuel pipe 9 are connected by an air pipe 11, so that When the tip of the fuel pipe 9 is closed with tar or the like, the fuel returns from the air pipe 11 to the oil tank 7 through the closed space 10, so that there is no danger that the area around the oil combustor will be contaminated with the fuel.

Further, when the high point 9a of the fuel pipe 9 is opened to the atmosphere through the closed space 10, the strong wind causes
To the burner 1 when the internal pressure of the burner 1 increases.
Some or all of the fuel to flow to the air pipe 11
And may cause abnormal combustion or extinguishing. In the present invention, since the end of the pressure pipe 12 that opens the sealed space 10 to the atmosphere is connected to the air supply side of the burner 1, the inside of the sealed space 10 can be maintained at the atmospheric pressure, and the air pressure is applied to the suction / exhaust top 5. Sometimes, the pressure at the high point 9a of the fuel pipe 9 is also increased to oppose the fuel that is going to flow into the air pipe 11, so that the balance between the fuel and air supply amounts of the burner 1 does not change and stable combustion can be maintained. It is.

On the other hand, when a strong wind blows on the intake / exhaust top 5, the internal pressure of the closed space 10 increases, the oil level in the closed space 10 decreases, and air flows from the communicating portion 10a to the oil tank 7. . In the present invention, the cushioning material 1 is connected to the communication portion 10a.
3, the air passing through the communicating portion 10a rises as fine air bubbles and rises, and the oil surface of the oil tank 7 can be prevented from drastically waving. Oil bleeding did not occur on the surface of the oil tank 7 even if there was a mounting portion for the component 7.

In particular, as in the embodiment, when the cushioning material 13 is brought into close contact with the outside of the closed space 10 of the oil tank 7 and reaches the space above the oil level, the air that escapes from the communication portion 10a does not
The oil tank 7 passes through the interior of the oil tank 7 and escapes into the air, so that the oil tank 7 does not undulate at all, and the back surface of the upper plate of the oil tank 7 can be completely prevented from being wet by the oil splash. is there.

Therefore, even if the upper plate of the oil tank 7 has a vent for the outside air and a mounting portion for parts of the oil tank 7, oil bleeding is generated in the cotton dust accumulated on the oil tank 7. It is possible to prevent a serious trouble such as generating an offensive odor or starting igniting combustion of oil-soaked dust by the heat of the burner 1 to cause a fire accident. This system has been completed for the first time to prevent incomplete combustion gas accompanied by a large amount of foul odor generated from the gas.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part near an oil tank of an oil combustor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the entirety of an oil combustor showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Heat exchanger 3 Supply cylinder 4 Exhaust cylinder 5 Intake / exhaust top 6 Combustion fan 7 Oil tank 8 Fuel pump 9 Fuel pipe 9a High place 10 Sealed space 10a Communication part 11 Air pipe 11a Top part 12 Pressure pipe 13 Buffer material

Claims (3)

[Claims] 1. A burner 1 for burning petroleum fuel, a heat exchanger 2 communicating with the burner 1 to exchange heat with indoor air, an air supply cylinder 3 connected to the burner 1, and an exhaust pipe 4 connected to the heat exchanger 2. And a combustion fan 6 attached to the supply cylinder 3 or the exhaust cylinder 4 and forcibly venting combustion air to the burner 1.
And a fuel pipe 9 for supplying the fuel in the oil tank 7 to the burner 1 by the fuel pump 8, from a high point 9 a of the fuel pipe 9 connecting the fuel pump 8 and the burner 1 to the burner 1. Pipes downhill,
A closed space 10 is formed in the oil tank 7 at a communication portion 10 a below the oil level of the oil tank 7, and an air pipe 11 is provided to connect the closed space 10 and a high point 9 a of the fuel pipe 9.
In addition, the air pipe 11 is provided with a highest portion 11a higher than the high point 9a of the fuel pipe 9, and the closed space 10 is connected to a pressure pipe 12 communicating with the supply side of the burner 1. . 2. A communicating portion 1 between the sealed space 10 and the oil tank 7.
2. The oil supply device for an oil combustor according to claim 1, wherein a cushioning member 13 formed of fibers or open cells is attached to 0a. 3. A buffer 13 made of fibers or open cells is attached to the oil tank 7 side of the communication portion 10a connecting the closed space 10 and the inside of the oil tank 7, and the buffer 13 is in close contact with the outside of the closed space 10. The oil supply device for an oil combustor according to claim 1, wherein the oil is supplied to a space above the oil level of the oil tank (7).