JPS593238Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a combustion device, particularly a combustion device that supplies liquid fuel to a combustor using the static pressure of combustion air.

As a conventional combustion apparatus of this type, the one shown in FIG. 1 is used.

That is, in FIG. 1, 1 is a fuel tank that is a fuel supply source, 2 is an oil control leveler that is made airtight, and the fuel supplied from the fuel tank 1 via the fuel supply source circuit 3 is controlled to a predetermined level. Float valve 2 that closes when the liquid level accumulates to a certain level and opens when the liquid level falls below a predetermined level.
A is prepared.

4 is a fuel discharge port 5 located at a predetermined height h) higher than the liquid level of the oil control leveler 2 as shown in the figure.
6 is a fuel supply circuit that supplies fuel from the oil control leveler 2 to the discharge port 5 of the combustor 4; 7;
8 is a combustion air supply circuit that supplies air pressurized to a predetermined static pressure ΔP to the combustor 4 by a blower (not shown); 9 is a combustion air valve provided in the fuel supply circuit 6; This is a static pressure adding circuit that adds the static pressure (ΔP) of the air supply circuit 8 to the liquid level of the oil control leveler 2.

Next, the effect will be explained.

The operation of only the blower in advance for a predetermined period of time until the blower installed in the combustion air supply circuit 8 reaches a steady state of operation and a predetermined static pressure ΔP is obtained is called pre-purge, and is called pre-purge. When starting the combustion of 4,
First, do this pre-purge.

When this pre-purge is being performed, the fuel solenoid valve 7
is closed, and even if static pressure is applied to the oil control leveler 2 via the static pressure addition circuit 9, the fuel will not reach the combustor 4.
is not supplied.

When the fuel electromagnetic valve 7 is opened after the pre-purge is completed, fuel is supplied from the oil control leveler 2 to the discharge port 5 of the combustor 4 via the fuel supply circuit 6.

The supply pressure at this time is the differential pressure between the static pressure △P applied to the oil control leveler 2 and the pressure △h corresponding to the height h from the liquid level of the oil control leveler 2 to the discharge port 5 of the combustor 4. That is, ΔP to Δh.

Then, it mixes with combustion air supplied to the combustor 4 from the combustion air supply circuit 8, and is ignited by a spark plug (not shown) to combust.

In addition, when stopping combustion, the fuel electromagnetic valve 7 is closed, and even after fuel is no longer supplied to the combustor 4, the blower continues to operate for a predetermined period of time to perform a post purge to scavenge the combustor 4. After doing so, all operations are stopped.

Since the conventional type is configured as described above, when foreign matter contained in fuel oil adheres to the valve seat of the fuel solenoid valve 7 or dirt is trapped, the fuel solenoid valve 7 Even if the valve 7 is closed, fuel leaks.

During pre-purge and post-purge, the fuel supply circuit 6
Since the supply pressure ΔP−Δh is acting on the combustor 4, fuel leaks inside the combustor 4.

For this reason, when the next ignition occurs, abnormal combustion such as black smoke and ignition noise may occur, or in the worst case, an explosion or fire may occur.

This invention was made in order to eliminate the above-mentioned drawbacks.A static pressure release device is provided to release the static pressure added to the oil control leveler, and when no combustion occurs, the static pressure release device is operated. By releasing the static pressure applied to the oil control leveler, the supply of fuel to the combustor is stopped.

An embodiment of this invention will be explained below with reference to FIG.

In the figure, 10 is a static pressure release device, one end of an air discharge pipe 11 is opened above the oil control leveler 2,
The other end is opened to the atmosphere via the air solenoid valve 12, and the relationship between the minimum cross-sectional area S1 of this air circulation part and the minimum cross-sectional area S2 of the air circulation part of the static pressure adding circuit 9 is as follows. The arrangement is such that Sl>52 always holds when the solenoid valve 12 is opened.

Note that other parts are given the same reference numerals as in FIG. 1, and their explanation will be omitted.

Next, the effect will be explained.

When pre-purging is being performed, the air solenoid valve 12 is open, and the static pressure added to the oil control leveler 2 via the static pressure adding circuit 9 is transferred to the static pressure release device 10.
released into the atmosphere.

That is, since the relationship between the minimum cross-sectional area S1 of the static pressure release device 10 and the minimum cross-sectional area S2 of the static pressure adding circuit 9 is Sl>82, the oil reaches the oil control leveler 2 via the static pressure adding circuit 9. When the air electromagnetic valve 12 of the static pressure release device 10 is open, static pressure is released into the atmosphere from the air discharge pipe 11, and the liquid level of the oil control leveler 2 is not affected.

Therefore, no fuel is supplied to the combustor 4, which has the fuel discharge port 5 at a position higher than this liquid level.

After the pre-purge is completed, the air solenoid valve 12
When the circuit is closed, the static pressure △P from the static pressure addition circuit 9 is added to the liquid level of the oil control leveler 2, and the fuel is supplied to the combustor 4 at a supply pressure of △P - △h, as in the case of the conventional example. Supplied.

Then, it mixes with combustion air supplied to the combustor 4 from the combustion air supply circuit 8, and is ignited by a spark plug (not shown) to combust.

When stopping combustion, the air solenoid valve 12 is opened and the static pressure △P added to the liquid level of the oil control leveler 2 is released into the atmosphere via the static pressure release device 10. , the supply of fuel to the combustor 4 is stopped,
Perform a post purge and then stop all operations.

Note that FIG. 3 shows another embodiment.

In the figure, reference numeral 10 denotes a static pressure release device, in which an electromagnetic three-way valve 13 is installed in the static pressure adding circuit 9, and an air release pipe 14 is attached to the remaining end of the electromagnetic three-way valve 13. During combustion, the circuit between the combustion air supply circuit 8 and the oil control leveler 2 is closed, and between the oil control leveler 2 and the air discharge pipe 14 is open, and during combustion, the circuit between the combustion air supply circuit 8 and the oil control leveler 2 is closed. The structure is such that a circuit is opened between the oil control leveler 2 and the air discharge pipe 14, and a circuit is closed between the oil control leveler 2 and the air discharge pipe 14.

Note that other parts are given the same reference numerals as in FIG. 1, and their explanation will be omitted.

Further, the operation is almost the same as that in FIG. 2, and the explanation will be omitted.

As described above, according to this invention, a static pressure release device is provided to release the static pressure added to the oil control leveler, and when there is no combustion, the static pressure release device is operated to release the static pressure added to the oil control leveler. By releasing the static pressure, the fuel supply to the combustor is stopped, thereby eliminating fuel leakage to the combustor during non-combustion periods due to foreign matter or dust in the fuel. .

Therefore, it is possible to eliminate abnormal combustion, explosion, and fire at the next ignition.

A small amount of air flows through the above-mentioned static pressure release device only when the static pressure is released, and this air is non-sticky and does not contain any foreign matter or dirt that may cause a malfunction. Because there is a small possibility that air leaks occur when the static pressure release device is not operating, the probability of failure that causes air leaks is extremely low, improving reliability and preventing air leaks from occurring in the unlikely event that they occur. Even if the fuel is not supplied, the fuel supply is safely stopped, so a highly safe combustion device can be provided.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional combustion device, FIG. 2 is a circuit diagram of a combustion device showing one embodiment of this invention, and FIG. 3 is a circuit diagram of a combustion device showing another embodiment. In the figure, 2 is an oil control leveler, 4 is a combustor,
6 is a fuel supply circuit, 8 is a combustion air supply circuit, 9 is a static pressure adding circuit, and 10 is a static pressure release device. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] an oil control leveler that accumulates liquid fuel supplied from a fuel supply source and maintains a predetermined liquid level;
A combustor having a discharge port for liquid fuel supplied from the oil control leveler at a position higher than the liquid level of the oil control leveler, and a combustion system that supplies air pressurized to a predetermined static pressure to the combustor. a static pressure adding circuit for adding the static pressure of the combustion air supply circuit to the liquid level of the oil control leveler, and a static pressure for releasing the static pressure added to the oil control leveler. and a release device, which applies the static pressure to the oil control leveler during combustion in the combustor, and operates the static pressure release device to release the static pressure added to the oil control leveler during non-combustion. A combustion device characterized by: