JP3132264B2 - Return type nozzle burner 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 burner device provided with a return type nozzle capable of returning a part of spray fuel to a return pipe without spraying.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of this type of return type nozzle burner device. Reference numeral 1 denotes a return type nozzle capable of adjusting the spray flow rate by spraying petroleum fuel and returning a part of the fuel to a return pipe. The oil pressurized to a constant pressure by the constant pressure pump 4 is fed by the flow control valve 5 in a fixed amount. The fed oil enters the return nozzle 1 from the constant differential pressure pump 6 and is sprayed. A part enters the return line 8 through the check valve 7, returns to the oil supply line 3 on the suction side of the constant-pressure pump 6 again, and enters the constant-pressure pump 6. 9 is an accumulator. The spray flow rate by the return nozzle 1 is controlled by a flow control valve 5. When the spray flow rate is increased, the spray pressure and the return pressure (pressure in the return pipe) are increased, and when the spray flow rate is reduced, the opposite is effected.

[0003]

However, in the above-mentioned conventional apparatus, the residual pressure at the time of the end of the previous operation (fire extinguishing) has an oil supply pipe downstream of the oil supply constant pressure pump 4 and the flow control valve 5. There is a problem that the flow rate sprayed from the return type nozzle 1 at the start of the next operation (ignition) is not determined because it remains in the path 3 and the return pipe 8 as it is.
That is, when the residual pressure is high, the spray flow rate at the time of ignition becomes large, and when the residual pressure is low, the spray flow rate at the time of ignition becomes small, and a sound, soot or odor appears at the time of ignition. Had the disadvantage of becoming unstable.

Accordingly, an object of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a return type nozzle burner device using a return type nozzle that can stably and reliably ignite.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, a return type nozzle burner device of the present invention adjusts a spray flow rate by spraying petroleum fuel and returning a part of the fuel to a return pipe. A return-type nozzle, an oil supply line for supplying oil from an oil tank to the return-type nozzle, and a constant differential pressure pump provided on a side of the oil supply line near the return-type nozzle. An oil supply constant pressure pump provided on a side of the oil supply line close to the oil tank, and a flow control valve provided in the oil supply line between the constant differential pressure pump and the oil supply constant pressure pump. A return type nozzle burner device in which a return end of the return line is connected to an oil supply line on the suction side of the constant pressure pump, wherein the oil supply constant pressure pump and the flow rate are connected to the oil supply line. By providing a bypass line bypassing the control valve and providing an on-off valve in the bypass line, and once opening the on-off valve of the bypass line after the end of operation or prior to the ignition operation, the suction of the constant differential pressure pump is performed. configured to open the residual pressure side and a return line, back further the
Pressure from the oil supply pipeline to the return pipeline.
If the pipe is closed, close it and return the oil supply pipe from the return pipe side.
Open when pressure over a certain level is applied to the roadside
The first feature is that a pressure relief check valve is provided . The return type nozzle burner apparatus of the present invention, petroleum
Spray the fuel and return part of the fuel to the return line
The return that can adjust the spray flow rate by setting
Stone from the oil tank to the return nozzle
An oil supply line for supplying oil, and an oil supply line for the oil supply line.
Constant differential pressure pump provided on the side close to the return type nozzle
And the oil supply line on the side near the oil tank
Constant pressure pump for oil transfer, constant pressure pump and constant pressure pump for oil transfer
And a flow control valve provided in the oil supply line between
Having a return end of the return line connected to the suction of the constant-pressure pump.
Return nozzle bar connected to the oil supply line
The oil supply constant pressure pump and the flow rate control.
Connect a bypass line that bypasses the valve in the middle of the return line.
In addition, an on-off valve and oil
When pressure is applied from the tank to the return nozzle
Is closed and the return type nozzle side to the oil tank side
Constant pressure released when pressure over a certain pressure is applied to
A second feature is that a relief check valve is provided . The return type nozzle burner apparatus of the present invention, the
In addition to the second feature, a common return line and bypass line
Pressure is applied to the pipeline from the oil supply pipeline to the common pipeline
If it is closed, it is closed and the oil supply pipeline side from the common pipeline side
When the pressure exceeds a certain level, the
A third feature is that a leaf check valve is provided . Further, in addition to the third feature, the return type nozzle burner device of the present invention is arranged in parallel with the constant pressure relief check valve of the common pipeline.
In the form, the common line and the suction side of the constant differential pressure pump
During the period, pressure is applied from the common pipeline to the oil supply pipeline
If the oil supply line is closed, the oil supply line side to the common line side
Constant pressure released when pressure over a certain pressure is applied to
The fourth feature is that a relief check valve is provided .

[0006]

According to the first feature of the present invention, the on-off valve of the bypass line is automatically opened once after the operation is completed or before the operation is started, prior to the ignition operation. Is released through the on-off valve in such a manner that the residual oil flows backward, and the residual pressure due to the residual oil is released.
Similarly, residual pressure due to oil remaining in the return line is released through the on-off valve. Therefore, the ignition operation can be started with the state not affected by the residual pressure as an initial state, and the ignition can be performed without being adversely affected by the residual pressure. Ignition operation is the driving of the oil pressure constant pressure pump,
The flow control valve is opened, the constant differential pressure pump is driven, and when spraying is performed from the return type nozzle, it is ignited by a spark from an igniter (not shown). In addition, constant pressure relief is closed when pressure is applied to the return line from the oil supply line side to the return line side, and is opened when pressure exceeding a certain pressure is applied from the return line side to the oil supply line side. By installing a check valve, the residual pressure on the suction side of the constant-differential pressure pump is completely released when the on-off valve of the bypass line is automatically opened once after the start of operation or at the start of operation, prior to the ignition operation. is the, but the residual oil return line is opened by an amount exceeding the set pressure by pressure relief check valve said return Ri conduit, below the residual pressure remaining as it is to the return line
Will be retained . This makes it possible to maintain the pressure in the return line at a constant pressure, that is, it is possible to maintain the return pressure of the return nozzle at an appropriate pressure, and to spray the spray in the return nozzle with a certain amount or more. It can start stably and ignition is performed more stably. According to the second feature of the present invention, a constant pressure pump for oil supply and a bypass line bypassing the flow control valve are provided connected to the middle of the return line, and an on-off valve is provided in the bypass line. And a constant-pressure relief check valve that closes when pressure is applied from the oil tank side to the return nozzle side and that is opened when pressure above a certain pressure is applied from the return-type nozzle side to the oil tank side. With this arrangement, if the on-off valve of the bypass pipe is automatically opened once before the ignition operation at the end of operation or at the start of operation, only the residual oil on the suction side of the constant differential pressure pump exceeds the set pressure. It is opened through the pressure relief check valve of the bypass line from the common line, also the residual oil return line also the set pressure super
Only the excess is released from the return line through the constant pressure relief check valve in the bypass line. As a result, a residual pressure equal to or lower than the set pressure of the constant pressure relief check valve in the bypass line remains as it is on the suction side and the return line of the constant differential pressure pump. This makes it possible to maintain the pressure on the suction side and the return pressure of the constant differential pressure pump as an initial state prior to the ignition operation at an appropriate pressure, and starts the initial spraying by the return type nozzle from an appropriate spray pressure and an appropriate spray flow rate. And stable ignition is achieved. According to the third aspect of the present invention, in addition to the action of the second aspect, pressure is applied to the common pipeline between the return pipeline and the bypass pipeline from the oil supply pipeline to the common pipeline. In this case, a constant-pressure relief check valve that closes and opens when a pressure equal to or higher than a certain pressure is applied from the common pipeline side to the oil supply pipeline side is provided, so operation starts in an initial state with a constant residual pressure. In the early stage of the operation of the constant-pressure pump for oil supply, oil is prevented from escaping from the oil supply line to the common line, and the pressure on the suction side of the constant-pressure pump is reliably increased. , The initial spray pressure and the flow rate can be secured to a certain degree or more, and more stable ignition is performed. According to the fourth aspect of the present invention, in addition to the operation of the third aspect, the common line and the suction side of the constant differential pressure pump are arranged in parallel with the constant pressure relief check valve of the common line. Between
A constant-pressure relief check valve that closes when pressure is applied from the common pipeline side to the oil supply pipeline side and that opens when pressure exceeds a certain pressure from the oil supply pipeline side to the common pipeline side is provided. The operation is started under initial conditions having a constant residual pressure, and in the initial period when the driving of the oil supply constant pressure pump or the constant pressure differential pump is started, the pressure on the suction side of the constant pressure differential pump is going to excessively increase. However, the pressure is released to the common pipeline through the constant pressure relief check valve. Therefore, the prevention that initial atomization pressure and the flow rate of the return type nozzle is excessive, are made more stable ignition.

[0007]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a block diagram showing a second embodiment, and FIG. 3 is a block diagram showing a third embodiment.

A first embodiment will be described with reference to FIG.
From the oil tank 2, a constant amount of oil pressurized to a constant pressure by the oil supply constant pressure pump 4 through the oil supply line 3 is sent by the flow control valve 5 in a fixed amount. The fed oil enters the return nozzle 1 from the constant differential pressure pump 6 and is sprayed. A part enters the return line 8 through the check valve 7, returns to the oil supply line 3 on the suction side of the constant-pressure pump 6 again, and enters the constant-pressure pump 6. 9 is an accumulator. The spray flow rate by the return nozzle 1 is controlled by a flow control valve 5. When the spray flow rate is increased, the spray pressure and the return pressure (pressure in the return pipe) are increased, and when the spray flow rate is reduced, the opposite is effected. The above points are the same as those of the conventional device described above.

In this embodiment, the oil supply line 3
A bypass line 10 bypassing the oil supply constant pressure pump 4 and the flow control valve 5 is provided.
Is provided. The return line 8 is provided with a constant pressure relief check valve 12. The constant-pressure relief check valve 12 closes when pressure is applied from the oil supply line 3 to the return line 8, and a pressure exceeding a certain pressure is applied from the return line 8 to the oil supply line 3. The passage is opened when it is added. The on-off valve 11 of the bypass conduit 10 is automatically opened once after the operation or before the ignition operation in the next operation. 13
Is an accumulator provided in the return line 8.

Immediately after the two pumps 4 and 6 are stopped and the operation is terminated, the oil remains in the oil supply line 3 between the two pumps 4 and 6 in a state where oil is confined. Has residual pressure. The same applies to the return line 8. The on-off valve 11 of the bypass line 10, after the end of operation,
Alternatively, prior to the ignition operation in the next operation, once the oil is automatically released, the residual pressure due to the residual oil on the suction side of the constant differential pressure pump 6 passes through the on-off valve 11 and the oil supply constant pressure pump. 4, that is, open to the oil tank 2 side. The remaining oil in the return line 8 exceeding the set pressure of the constant-pressure relief check valve 12 is released through the oil supply line 3 and the on-off valve 11 of the bypass line 10. From the state of the residual pressure as described above, the driving of both pumps 4 and 6 is started,
When the ignition operation starts, the pressure on the suction side of the constant differential pressure pump 6 is always increased from the initial state where the pressure is sufficiently released. The pressure in the return line 8, that is, the return pressure is initially set to a constant pressure regulated by the constant pressure relief check valve 12. Therefore, since both initial states are constant and stable, the spray flow rate and the spray pressure of the return type nozzle 1 at the time of ignition are stable without fluctuation, and stable ignition can be performed. The increase in the pressure on the suction side of the constant differential pressure pump 6 and the increase in the pressure in the return line 8 at the time of ignition gradually increase by the action of the accumulators 9 and 13, respectively, so that the spray flow rate also gradually increases.
A slow ignition effect is obtained.

When the constant pressure relief check valve 12 is not provided in the return line 8, the residual pressure in the return line 8 also changes the opening and closing of the bypass line 10 similarly to the suction side of the constant differential pressure pump 6. valve
It is completely opened by opening 11. Therefore, in this case, the pressure in the return line 8 cannot be maintained as an appropriate initial return pressure, but fluctuation such as a change in the residual pressure every operation is prevented, and the ignition condition, which is a disadvantage of the conventional apparatus, is reduced. Fluctuations can be prevented.

A second embodiment will be described with reference to FIG. From the oil tank 2, the oil supplied from the oil supply line 3 to the oil supply line 3 is pressurized to a constant pressure by the oil supply constant-pressure pump 4 by the flow control valve 5.
A certain amount of oil is fed. The fed oil enters the return nozzle 1 from the constant differential pressure pump 6 and is sprayed. A part enters the return line 8 through the check valve 7, returns to the oil supply line 3 on the suction side of the constant-pressure pump 6 again, and enters the constant-pressure pump 6. 9 is an accumulator. The spray flow rate by the return nozzle 1 is controlled by a flow control valve 5. When the spray flow rate is increased, the spray pressure and the return pressure (pressure in the return pipe) are increased, and when the spray flow rate is reduced, the opposite is effected. The above points are the same as those of the conventional device described above.

In this embodiment, a bypass line 20 that bypasses the constant pressure pump 4 for oil supply and the flow control valve 5 is returned to a return line 8.
The bypass pipe 20 is provided with an on-off valve 21 and a constant-pressure relief check valve 22. The constant-pressure relief check valve 22 is closed when pressure is applied from the oil tank 2 to the return nozzle 1 and is closed when a pressure equal to or more than a predetermined pressure is applied from the return nozzle 1 to the oil tank 2. Are open. By connecting the bypass line 20 in the middle of the return line 8, the two lines 20 and 8 are connected to the common line 30 connected to the oil supply line 3.
To share.

Once the on-off valve 21 of the bypass pipe 20 is automatically opened after the operation is completed or at the start of the operation and before the ignition operation, the residual oil on the suction side of the constant pressure differential pump 6 is checked against the constant pressure relief. Only the pressure exceeding the set pressure of the valve 22 is opened from the common line 30 through the constant-pressure relief check valve 22 of the bypass line 20, and only the amount of residual oil in the return line 8 exceeding the set pressure is returned to the return line. The line 8 is opened through the constant pressure relief check valve 22 of the bypass line 20. As a result, a residual pressure equal to or lower than the set pressure of the constant pressure relief check valve 22 remains at the same pressure on the suction side and the return line 8 of the constant differential pressure pump 6 as it is.
As a result, both the suction side pressure and the return pressure of the constant differential pressure pump 6 as initial conditions prior to the ignition operation can be maintained at appropriate pressures. The initial spraying by the nozzle 1 can be started from an appropriate spraying pressure and spraying rate, and stable ignition is achieved. By the way, the return pressure at the beginning of operation is determined by the set pressure of the constant pressure relief check valve 22,
The spray pressure of the return nozzle 1 is determined by the return pressure + the set pressure of the constant differential pressure pump 6.

In the second embodiment, the common line 30 may be provided with a constant-pressure relief check valve in the direction indicated by 12 in FIG. 1 or 31 in FIG. This constant pressure relief check valve is connected to the oil supply line 3
It is configured to close when pressure is applied from the side to the common pipeline 30 side, and to be opened when pressure equal to or higher than a certain pressure is applied from the common pipeline side 30 to the oil supply pipeline 3 side. By providing the constant pressure relief check valve, the operation is started under an initial state having a constant residual pressure, and when the oil supply constant pressure pump 4 and the constant differential pressure pump 6 are driven at an initial low pressure, the oil supply is started. Oil is prevented from flowing from the pipe line 3 side to the common pipe line 30 side, so that the pressure on the suction side of the constant differential pressure pump 6 does not increase at the beginning of operation, and the initial spraying of the return nozzle 1 is prevented. The pressure and the flow rate are ensured more than a certain level, and more stable ignition is performed.

A third embodiment will be described with reference to FIG. In this embodiment, two constant pressure relief check valves 31 and 32 are additionally provided in the common pipeline 30 in the configuration shown in FIG. The constant pressure relief check valve 31 is the same as the constant pressure relief check valve described in the above paragraph 0014.
When pressure is applied to the 30 side, it is closed and the common pipeline side
It is configured to open when a pressure equal to or higher than a certain pressure is applied to the oil supply pipeline 3 from 30. The constant-pressure relief check valve 32 is a constant-pressure relief check valve in a direction opposite to that of the constant-pressure relief check valve 31.
It is configured to close when pressure is applied to the oil supply line 3 and open when pressure equal to or higher than a certain pressure is applied from the oil supply line 3 to the common line 30. In addition, FIG.
Constant pressure relief check valve 7a instead of check valve 7 in FIG.
Is used.

The on-off valve 21 of the bypass line 20 is automatically opened once after the operation or before the ignition operation at the next operation. By this opening, the pressure due to the residual oil trapped in the return line 8 is released by the constant pressure relief check valve 22 of the bypass line 20 to the set pressure of the valve 22. That is, the return pressure as the initial state is determined. The pressure due to the residual oil remaining on the suction side of the constant pressure pump 6 is released to the higher set pressure of the constant pressure relief check valves 22 and 32. That is, the pressure as the initial state on the suction side of the constant differential pressure pump 6 is determined. On the other hand, the operation is started in the initial state having the above-mentioned constant residual pressure, and in the initial stage when the driving of the oil supply constant pressure pump 4 and the constant differential pressure pump 6 is started, the common line 30 The low-pressure oil is prevented from flowing into the side, so that the pressure on the suction side of the constant differential pressure pump 6 does not increase at the beginning of operation. Similarly, even when the suction side pressure of the constant pressure pump 6 is going to rise excessively in the early stage when the driving of the oil supply constant pressure pump 4 or the constant pressure pump 6 is started, the pressure is maintained at the constant pressure relief check valve 32. Through to the common conduit 30 side. Therefore,
Excessive initial spray pressure and flow rate of the return nozzle 1 are prevented from being excessive, and stable ignition is performed.

[0018]

According to the present invention, the return type nozzle burner device according to the first aspect of the present invention has the above configuration and operation.
A bypass line bypassing the oil supply constant pressure pump and the flow rate control valve is provided for the oil supply line, and an on-off valve is provided in the bypass line, and after the operation is completed or prior to the ignition operation, the bypass line is provided. By opening the on-off valve once, the residual pressure on the suction side and the return line of the constant differential pressure pump is configured to be released, so that the ignition operation starts without being affected by the residual pressure in the previous operation. The ignition can be performed stably without being affected by residual pressure such as noise, soot, or odor at the time of ignition. In addition, the return line is closed when pressure is applied from the oil supply line side to the return line side, and is opened when pressure exceeding a certain pressure is applied from the return line side to the oil supply line side. Since a stop valve is provided, the residual pressure in the return line should be maintained at an appropriate constant pressure.
That is , the return pressure of the return nozzle can be maintained at an appropriate pressure, so that the spray in the return nozzle can be started stably with a certain amount or more of pressure and ignition can be performed more stably. it can. Claims
According to the return type nozzle burner device described in 2 , the bypass line bypassing the oil supply constant pressure pump and the flow rate control valve is connected and provided in the middle of the return line, and the on-off valve and the oil A constant-pressure relief check valve that closes when pressure is applied from the tank side to the return nozzle side and opens when pressure over a certain pressure is applied from the return nozzle side to the oil tank side is provided. At the end of operation or at the start of operation, the on-off pressure and return pressure of the constant differential pressure pump as an initial state prior to the ignition operation are appropriately adjusted by automatically opening the on-off valve of the bypass pipe prior to the ignition operation. A constant pressure can be maintained, so that the initial spraying by the return nozzle can be started from an appropriate spraying pressure and spraying flow rate, and a stable ignition can be ensured. It can be. According to the return type nozzle burner device of the third aspect , in addition to the effect of the configuration of the second aspect , in addition to the common pipeline between the return pipeline and the bypass pipeline, from the oil supply pipeline side to the common pipeline side A constant pressure relief check valve that closes when pressure is applied and opens when pressure equal to or more than a certain pressure is applied from the common pipeline side to the oil supply pipeline side. At the beginning of the operation when the constant-pressure pump or constant-differential-pressure pump is started, the low-pressure oil can be prevented from escaping from the oil supply pipeline to the common pipeline. , The pressure on the suction side of the constant differential pressure pump can be reliably increased, and the initial spray pressure and the flow rate of the return type nozzle can be secured to a certain level or more, whereby more stable ignition can be performed According to the return type nozzle burner device of the fourth aspect,
In addition to the effect of the configuration according to claim 3 , oil is provided between the common line and the suction side of the constant-differential pressure pump from the common line side in parallel with the constant-pressure relief check valve of the common line. A constant-pressure relief check valve that closes when pressure is applied to the supply line and opens when pressure equal to or more than a certain pressure is applied from the oil supply line to the common line. In the initial operation when the driving of the oil supply constant pressure pump or the constant differential pressure pump was started under the initial conditions having
It is possible to prevent the pressure on the suction side of the constant differential pressure pump from excessively increasing and prevent the initial spray pressure and the flow rate of the return type nozzle from becoming excessive, so that more stable ignition can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the device of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment.

FIG. 3 is a configuration diagram showing a third embodiment.

FIG. 4 is a configuration diagram showing a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Return type nozzle 2 Oil tank 3 Oil supply line 4 Constant pressure pump for oil supply 5 Flow control valve 6 Constant pressure pump 8 Return line 10 Bypass line 11 Open / close valve 12 Constant pressure check valve 20 Bypass line 21 Open / close Valve 22 Constant pressure relief check valve 30 Common line 31 Constant pressure relief check valve 32 Constant pressure relief check valve

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shinji Hirase 32nd, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Tetsuya Higashi 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (Noritsu, Inc. 72) Inventor Masaaki Matsuda 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Hiroki Hasegawa 32nd Akashi-cho, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (56) Noritsu, Ltd. -110210 (JP, A) Jikken 62-10577 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 1/00 105 F23N 1/00 106 F23D 11/28 F23K 5 / 04

Claims (4)

(57) [Claims] 1. A return type nozzle capable of adjusting a spray flow rate by spraying petroleum fuel and returning a part of the fuel to a return pipe, and supplying oil from the oil tank to the return type nozzle. Oil supply line, a constant pressure pump provided on the oil supply line near the return nozzle, and an oil supply constant pressure pump provided on the oil supply line near the oil tank. And a flow control valve provided in an oil supply line between the constant differential pressure pump and the oil supply constant pressure pump, wherein a return end of the return line is connected to the oil supply line on the suction side of the constant differential pressure pump. A return type nozzle burner device connected to a pipeline, wherein a bypass pipeline bypassing the oil supply constant pressure pump and the flow rate control valve is provided for the oil supply pipeline, and an on-off valve is provided in the bypass pipeline. , Driving end By opening the on-off valve of the bypass pipe once after or before the ignition operation, the residual pressure on the suction side and the return pipe of the constant differential pressure pump is configured to be released. Is the oil supply pipeline side
When pressure is applied to the return conduit side, close and return
Pressure above the fixed pressure from the pipeline to the oil supply pipeline.
A return-type nozzle burner device provided with a constant-pressure relief check valve that is opened when a failure occurs. 2. Spraying petroleum fuel and removing part of the fuel
Adjust the spray flow rate by returning to the return line.
Return nozzle that can be
Oil supply line for supplying oil to the turn nozzle
On the side of the oil supply line near the return nozzle
A constant pressure pump to be provided;
Constant pressure pump for oil supply provided on the side close to
Installed in the oil supply line between the pump and the constant pressure pump for oil transmission
A flow control valve, and a return end of the return line.
Connected to the oil supply line on the suction side of the differential pressure pump
A return-type nozzle burner device, wherein the oil-feeding constant pressure
Ahead of the pump and the bypass line bypassing the flow control valve
It is connected and provided in the middle of the return line and the bypass
On-off valve on pipeline, return type nozzle side from oil tank side
When pressure is applied to the
When pressure above a certain level is applied from the oil side to the oil tank side
A constant-pressure relief check valve that is opened when
Characteristic return type nozzle burner device. 3. A common line for a return line and a bypass line.
When pressure is applied from the oil supply pipeline side to the common pipeline side
Is closed and one line goes from the common pipeline to the oil supply pipeline.
Constant pressure release that opens when pressure over the constant pressure is applied
3. The return type nozzle burner device according to claim 2, further comprising a check valve . 4. A parallel connection with a constant pressure relief check valve of a common line.
In the form, the common line and the suction side of the constant differential pressure pump
During the period, pressure is applied from the common pipeline to the oil supply pipeline
If the oil supply line is closed, the oil supply line side to the common line side
Constant pressure released when pressure over a certain pressure is applied to
The return type nozzle burner device according to claim 3, further comprising a relief check valve .