JPH0711311Y2 - Oil combustor fuel supply system - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to improvement of a fuel supply passage to a burner of an oil combustor, and prevents generation of a bad odor during a fire extinguishing operation.

[Prior art]

For the one that burns the fuel pumped by the electromagnetic pump to the burner, the oil remains in the oil supply pipe even if the fuel pump is stopped during the fire extinguishing operation, and the remaining oil gradually flows to the burner, The remaining oil in the oil supply pipe, which became high temperature due to residual heat, might be vaporized and sent to the burner, which would extend the fire extinguishing time. Further, when oil or vaporized gas was sent to the burner immediately after extinguishing the fire, this fuel was thermally decomposed to generate a foul odor. Therefore, in Applicant's No. 61-170858, the applicant directly connects the air passage under the wind pressure of the fan for supplying the combustion air and the oil supply pipe to which the fuel is sent with the air pipe, and while burning the burner. When the fuel trying to enter the air pipe and the wind pressure supplied to the air pipe are balanced and the combustion air supply fan is stopped by the fire extinguishing operation and the air pipe becomes atmospheric pressure, the fuel in the oil supply pipe toward the burner Has been proposed to prevent fuel from flowing into the air pipe and leaving fuel at the tip of the fuel supply pipe near the burner.

[Problems to be solved by the device]

By the way, if the air pipe is directly connected to the fuel pipe, if the tip of the fuel pipe on the burner side is clogged with tar, etc., fuel will flow out through the air pipe to the air duct other than the burner, There is a risk that the fuel will leak to various places, and not only the fuel will contaminate the equipment, but when the fuel touches the high temperature part, it will be a fire and other serious problems, which was extremely dangerous.

[Means for Solving the Problems]

This invention improves the above-mentioned problems, and the oil tank 1
Fuel pump 2 for pumping up the fuel, a burner 3 connected to the fuel pump 2 by an oil supply pipe 4, an air passage 6 for supplying air to the burner 3, and a combustion air supply for discharging combustion air to the air passage 6. A fan 5 is provided, and a low position portion is formed in the middle of the oil supply pipe 4 so as to be lower than the tip of the oil supply pipe 4 seen by the burner 3 so that the discharge side of the combustion air supply fan 5 is provided. In an oil combustor that applies wind pressure to the low position of the oil supply pipe 4, a closed space 9 having the same oil surface as the oil tank 1 is formed by communicating with the oil in the oil tank 1 and the discharge of the combustion air supply fan 5 The other end of the air pipe 7 communicating with the side air passage 6 is connected to the closed space 9, and the closed space 9 and the oil supply pipe 4 are connected.
The second air pipe 10 is connected to the lower position of the second air pipe 10, and the height of the second air pipe 10 is higher than the height of the fuel pipe 4 from the connecting portion of the second air pipe 10 and the fuel pipe 4 to the burner 3. It is located high.

[Explanation of action]

By connecting the second air pipe 10 in the middle of the oil supply pipe 4 for supplying the fuel to the burner 3, and applying the wind pressure of the combustion air supply fan 5 to the oil supply pipe 4 via the air pipe 10 and the second air pipe 10. , The pressure is balanced when a part of the fuel enters the second air pipe 10. Then, when the fuel pump 2 and the combustion air supply fan 5 are stopped at the time of extinguishing the fire,
Part of the fuel inside penetrates into the second air pipe 10 so that no fuel remains at the tip of the fuel pipe 4 on the burner 3 side.
Realizes a deodorant structure when extinguishing a fire. On the other hand, when the fuel supply pipe 4 near the burner 3 is blocked by tar, the fuel sent by the fuel pump 2 is burned by the burner 3
Does not flow into the second air pipe 10 and is sent to the closed space 9. Since the closed space 9 communicates with the inside of the oil tank 1, the fuel sent to the closed space 9 does not come into contact with the oil tank 1.
There is no longer a risk of fuel spilling out of the oil combustor.

[Explanation of Examples]

The present invention will be described with reference to the embodiments shown in the drawings. 1 is an oil tank, 2 is a fuel pump attached to the oil tank 1, 3 is a burner of an oil combustor, and the oil tank 1, the fuel pump 2 and the burner 3 are It is connected through an oil supply pipe 4 and supplies fuel when the fuel pump 2 is operating. 5 is a combustion air supply fan mounted near the burner 3, 6
Is an air passage for supplying the air of the combustion air supply fan 5 to the burner 3, and the burner 3 is installed in the air passage 6,
The combustion air supply fan 5 discharges combustion air into the air passage 6,
The air sent to the air passage 6 supplies the burner 3. Reference numeral 11 is an ignition heater attached to the burner 3 and also used for preheating, and 12 is a combustion chamber provided in the upper portion of the burner 3. The fuel supplied to the burner 3 is ignited by the heat of the ignition heater 11 and is discharged from the air passage 6 Combustion is started by the supply of combustion air, and the combustion is completed in the combustion chamber 12. Reference numeral 9 denotes a closed space that communicates with the oil in the oil tank 1 and has the same oil surface as the oil tank 1. Reference numeral 8 denotes the lower end when the closed space 9 is formed in the oil tank 1 is submerged in the oil. It is a partition.
Reference numeral 7 denotes an air pipe that connects the discharge side of the combustion air supply fan 5 and the closed space 9, and 10 is a second air pipe that connects the closed space 9 and the oil supply pipe 4. The second air pipe 10 and the oil supply pipe 4 is located at a lower position lower than the tip of the fuel supply pipe 4 on the burner 3 side, and the connection of the fuel supply pipe 4 from the connection between the second air pipe 10 and the fuel supply pipe 4 to the burner 3 is performed. The height of the second air pipe 10 is set higher than the height. Therefore, when the fuel pump 2 is operated with the combustion air supply fan 5 stopped, the fuel also flows into the second air pipe 10, and the liquid level at this time is the same as that at a high place near the burner 3 of the oil supply pipe 4. While rising to the level and stopping, the entire amount of fuel sent by the fuel pump 2 is sent to the burner 3. Further, when the combustion air supply fan 5 operates, the air pipe 7 communicates with the air passage 6, so that wind pressure is also applied to the closed space 9 and the second air pipe 10, and the liquid level in the second air pipe 10 becomes fuel. Decrease until pressure and wind pressure balance. When the fire extinguishing operation is performed from this combustion state, the fuel pump 2
Then, the combustion air supply fan 5 is stopped, so that the fuel in the fuel supply pipe 4 sucks air from the tip on the burner 3 side and flows into the second air pipe 10. Therefore, the fuel is not supplied into the burner 3 from the tip of the oil supply pipe 4 after the fire extinguishing operation, and the foul odor during the fire extinguishing can be prevented. On the other hand, when the fuel adheres to the tip of the fuel supply pipe 4 during combustion and the fuel becomes difficult to flow or the fuel cannot be supplied, the fuel sent from the fuel pump 2 flows through the second air pipe 10. Since it flows backward and is discharged to the closed space 9, and the closed space 9 communicates with the oil in the oil tank 1, the oil level in the closed space 9 is always the same as the oil tank 1 even when the fuel is returned. The oil level is maintained and there is no danger of flowing out from the air pipe 7 connected to the closed space 9.

[Explanation of effect]

As described above, in this invention, although the closed space 9 communicating with the oil tank 1 is interposed, the wind pressure of the combustion air supply fan 5 is applied to the fuel supply pipe 4, while the fuel in the fuel supply pipe 4 is extinguished during the fire extinguishing operation. As the fuel flows into the second air pipe 10, fuel does not exist at the tip of the fuel supply pipe 4 facing the burner 3, and fuel is supplied from the fuel supply pipe 4 to the burner 3 after the fire extinguishing operation, and the fire extinguishing time becomes long, Also, the burner 3 after the fuel is extinguished
It was possible to prevent the trouble that the odor was supplied to the. Further, when a trouble occurs such that the tip of the oil supply pipe 4 is clogged with tar or the like, the fuel is returned from the second air pipe 10 to the closed space 9 communicating with the oil tank 2, and the trouble of the fuel flowing out of the burner 3 can be prevented. It was possible to obtain an oil combustor with excellent safety.

[Brief description of drawings]

The drawing is a sectional view of an oil combustor according to the present invention. 1 ... Oil tank, 2 ... Fuel pump, 3 ... Burner, 4
…… Oil supply pipe, 5 …… Combustion air supply fan, 6 …… Air passage,
7 ... Air pipe, 8 ... Partition, 9 ... Sealed space, 10 ...
… Second air pipe

Claims (1)

[Scope of utility model registration request] 1. A fuel pump 2 for pumping fuel from an oil tank 1, a burner 3 connected to the fuel pump 2 by an oil supply pipe 4, an air passage 6 for supplying air to the burner 3, and an air passage 6
And a combustion air supply fan 5 that discharges combustion air,
A low position portion is formed in the middle of the oil supply pipe 4 so as to be lower than the tip of the oil supply pipe 4 looking into the burner 3 so that the wind pressure on the discharge side of the combustion air supply fan 5 is reduced. In the petroleum combustor added to the low position, a closed space 9 having the same oil level as the oil tank 1 is formed in communication with the oil in the oil tank 1, and an air passage 6 on the discharge side of the combustion air supply fan 5 is formed. The other end of the communicating air pipe 7 is connected to the closed space 9, and the closed space 9 and the low position portion of the oil supply pipe 4 are connected by the second air pipe 10, and the second air pipe 10 is connected.
A fuel supply device for an oil combustor, characterized in that the height of the second air pipe 10 is higher than the height of the oil supply pipe 4 from the connection between the oil supply pipe 4 and the burner 3.