JPS6042259Y2 - liquid fuel combustion equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a liquid fuel combustion device.

Generally, in a liquid fuel combustion device, an oil reservoir is provided at the bottom of the combustion cylinder, and liquid fuel is supplied to the oil reservoir through an oil control valve and evaporated there.
Some combustion engines supply and mix combustion air to this fuel vapor through a number of vent holes provided in the peripheral wall of the combustion tube to cause combustion within the combustion tube.

However, even if a fire extinguishing operation is performed, combustion equipment with an oil reservoir continues to burn until the fuel in the oil reservoir is burned out, so it is not possible to extinguish the fire instantaneously, and it is difficult to extinguish the fire in an emergency such as an earthquake. There are problems such as the difficulty of countermeasures.

In view of these points, it is an object of the present invention to provide a liquid fuel combustion device that can shorten the extinguishing time and perform almost instantaneous extinguishing.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a housing of a liquid fuel combustion device, and within this housing 1, a horizontally long combustion tube 2 is arranged concentrically with the housing 1 and substantially horizontally.

One end of this combustion tube 2 is closed by an end plate 3, while the other end is open, and a combustion chamber 4 is formed inside.

A flange 2a is formed at the tip of the combustion tube 2, and the flange 2a is fixed to the flange 1a of the housing 1, so that an annular shape with a closed tip is formed between the housing 1 and the combustion tube 2. A combustion air passage 5 is formed.

Further, an oil reservoir 6 is formed at the bottom of the combustion tube 2 near the end plate 3, and a primary air hole 7 is bored in the peripheral wall of the combustion tube 2 on the upstream side of the oil reservoir 6. On the other hand,
A large number of secondary air holes 8.8 are bored in the peripheral wall of the combustion tube 2 downstream of the oil reservoir 6.

Furthermore, flame stabilizing plates 9 and 10 are supported by a plurality of support rods 11 and 12 extending in the radial direction inside the combustion tube 2 and on the downstream side of the oil sump 6.

On the other hand, a blowing chamber 13 is formed at the rear of the housing 1, and a combustion blower 14 is provided in the blowing chamber 13, and blows combustion air taken in through an intake pipe 15 into a combustion air passage 5. It is now possible to blow air towards it.

Incidentally, a fuel supply pipe 16 is connected to the bottom of the oil reservoir 6.

An oil control valve 17 is provided in the fuel supply pipe 16.
, a solenoid valve 18 and a sealed auxiliary container 19 are installed in this order, and liquid fuel from an oil tank (not shown) is once supplied into the auxiliary container 19 via an oil control valve 17 and a solenoid valve 18. The oil is further supplied into the oil reservoir 6 from the auxiliary container 19.

The upper part of the auxiliary container 19 is connected to the discharge side of the combustion blower 14 and the suction side of the combustion blower 14 through a high-pressure side pressure equalization pipe 20 and a negative pressure pipe 21, respectively, and the high-pressure side pressure equalization pipe 20 is provided with a second solenoid valve 22 that is open during normal combustion.

Further, the negative pressure pipe 21 is provided with a third solenoid valve 23 that opens when extinguishing a fire.

When the combustion blower 14 is driven, the combustion air becomes an air jet through the primary air hole 7 and the secondary air hole 8, which have small opening areas, and is introduced into the combustion tube 4 with a pressure drop. Inside the combustion tube 4, air flows from the end plate of the combustion tube 2 toward the open end.

Therefore, when the solenoid valve 18 is opened, the liquid fuel from the oil tank is transferred to the oil control valve 17 and the solenoid valve 1.
The oil flows into the auxiliary container 19 through the oil tank 8 and is further supplied to the oil sump 6.

On the other hand, at this time, since the upper part of the auxiliary container 19 is connected to the discharge side of the combustion blower 14 via the high-pressure equalization pipe 20, the pressure on the discharge side is applied to the liquid level in the auxiliary container 19, and the oil The fuel level in the oil reservoir 6 is raised by the pressure difference between the fuel level and the pressure applied on the fuel level in the reservoir 6, and is maintained at a predetermined level.

Therefore, when an ignition heater (not shown) is energized to heat the liquid fuel, a portion of the fuel evaporates and simultaneously mixes with the combustion air flowing in from the primary air hole 7, and is ignited by the heat of the ignition heater.

Therefore, the ignition activates the evaporation of the liquid fuel, which mixes with the combustion air that has flowed into the combustion tube 4 and is combusted, and the combustion gas is discharged from the opening at the tip of the combustion tube 2.

On the other hand, when stopping the operation of the combustion device, the solenoid valve 18 and the second solenoid valve 22 are closed, and the third solenoid valve 23 is opened.

Then, the supply of fuel from the oil tank is stopped, the pressure applied to the liquid level in the auxiliary container 19 disappears, and the inside of the auxiliary container 19 is connected to the suction side of the combustion blower 14 via the negative pressure pipe 21. By communicating with the auxiliary container 19, the fuel liquid level in the auxiliary container 19 becomes negative pressure.

Therefore, in accordance with the pressure drop applied to the liquid level in the auxiliary container, the liquid level in the oil reservoir 6 is lowered, and combustion is stopped, that is, extinguished within a relatively short period of time.

In addition, in the event of an emergency fire extinguishment, the solenoid valve 18
If the second solenoid valve 22 is closed, the third solenoid valve 23 is opened, and the combustion blower 14 is stopped, the pressure applied to the liquid level in the auxiliary container will disappear in the same way as described above. Due to this pressure drop, the liquid level in the oil reservoir 6 rapidly decreases, and the supply of combustion air is stopped, causing the fire to be extinguished rapidly.

In the above embodiment, the high pressure side pressure equalizing pipe 20 is provided with the second solenoid valve, but the third solenoid valve 23
If the resistance of the negative pressure pipe 21 is small, the second electromagnetic valve 22 is not necessarily provided.

As explained above, in the present invention, an auxiliary container is interposed between the oil sump provided at the bottom of the combustion cylinder and the oil control valve, and the oil sump is controlled by the pressure applied to the liquid level of the liquid fuel in the auxiliary container. In addition to maintaining the fuel level in the oil reservoir at a predetermined level, when extinguishing the oil tank, the above pressure is removed and the liquid level in the oil sump rapidly lowers.This greatly shortens the extinguishing time. If the drop in the liquid level is set to be equal to or greater than the depth of the fuel in the oil sump, it will be possible to extinguish the fire instantly.

[Brief explanation of drawings]

The drawing is a schematic diagram of the liquid fuel combustion apparatus of the present invention. 1...Housing, 2...Combustion tube, 6
...Oil sump, 17...Oil control valve, 18...Solenoid valve, 19...
・Auxiliary container, 20...High pressure side equalizing pipe, 21
... Negative pressure pipe, 22 ... Second solenoid valve, 23 ... Third solenoid valve.

Claims (1)

[Scope of utility model registration request] A sealed auxiliary container is interposed between the oil reservoir provided at the bottom of the combustion cylinder and the oil control valve for supplying liquid fuel to the oil reservoir, and the upper part of the liquid level of the auxiliary container is used for combustion. The discharge side of the blower is connected to the high pressure equalizing pipe, and the upper part of the liquid level of the auxiliary container is connected to the suction side of the combustion blower by a negative pressure pipe having an on-off valve that is closed during combustion operation. A liquid fuel combustion device.