JP2001241657A - Petroleum combustion equipment with air bleeding function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller capable of exhausting air remaining in a fuel pipe by a fuel pump in a short time when a burner is installed or a fuel is lacked. SOLUTION: The fuel pump 5 is mounted at the fuel pipe 4 for connecting the burner 2 to an oil tank. A fog-like fuel is sprayed from a fuel spray nozzle 3 at an end of the pipe 4 and ignited by an electric discharge igniter 6. A flame detector 7 is mounted at the burner 2. A safety unit for extinguishing the burner 2 by stopping the igniter 6 and the pump 5 when the detector 7 does not detect a flame after a predetermined time Tx is counted from a certain time after the operation is started is provided. The burner 2 has an initial operation confirming means 8 for confirming an operation from a state in which a fuel is not present in the pipe 4. The safety unit again counts the time Tx from when the count of the time Tx is not detected when the detector 7 detects a combustion flame before arriving at the time Tx and then does not detect the flame when the means 8 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device which can discharge air remaining in a fuel pipe in a short time when a pressure spray burner is installed or when fuel runs out.

[0002]

2. Description of the Related Art A fuel pipe for supplying fuel to a burner is installed between a fuel tank and a fuel spray nozzle of a burner. The fuel pipe is filled with air immediately after the burner is installed. Therefore, it is necessary to exhaust this air. If the fuel tank is installed far away and the fuel pipe is long, remove the fuel pipe near the burner and check that the fuel leaks from the fuel pipe due to the pressure difference between the fuel tank and the fuel pipe. Most of the air in the fuel pipe can be evacuated by connecting directly to.

[0003] When the fuel pump is driven by the driving operation, initially, only the air remaining in the fuel pipe is discharged and the fuel is not sprayed, and the burner causes an ignition mistake and stops. When the fuel pump is restarted by operating the operation switch or the operation switch, the fuel pump restarts, so by repeating this, the air in the fuel pipe and the air entrained fuel are sent out from the fuel spray nozzle, and eventually only the fuel is sprayed. To start combustion.

[0004]

Although air in a long fuel pipe can be extracted by a conventionally known method, air always remains in the fuel pipe near the fuel spray nozzle. Until the vehicle exits, the burner stops operating upon detecting a misfire even if the driver performs a driving operation. For this reason, if there is an ignition / extinguishing operation switch operation or a reset switch, this switch operation must be repeated many times, and the first operation operation without fuel in the fuel pipe is very troublesome.

[0005] Then, every time the ignition operation is performed, the fuel pump is driven to send out the air in the fuel pipe little by little to the burner, and the combustion is started in a short time. Is not sent to the burner, and when switching from air to fuel, the state in which fuel with air entrainment continues for a while will be detected. The burner needs to be operated several times, and normal combustion is started after the air in the fuel pipe has completely escaped.

When the burner is started to operate, the combustion fan is operated for a predetermined time while the discharge ignition device and the fuel pump are stopped, and the burner and the combustion chamber are filled with fresh air before the discharge ignition device and the fuel pump are started. The unfired air-exchanged fuel is released from the start of the operation of the fuel pump to the start of ignition, and adheres to the burner wall and the combustion chamber wall.

[0007] When an ignition error occurs, such an operation must be performed many times. Therefore, a large amount of fuel must be supplied to the burner wall or the combustion chamber until normal combustion can continue without any ignition error. Since the fuel adheres to the chamber wall and usually starts to burn, the adhered fuel gradually evaporates, causing a problem of discharging incomplete combustion gas with a bad smell for a long time.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. A fuel spray nozzle 3 is attached to a burner 2 to which combustion air is sent by a combustion fan 1, and a fuel spray nozzle 3 and a fuel tank are connected. Is connected by a fuel pipe 4, a fuel pump 5 is mounted in the middle of the fuel pipe 4, and a discharge igniter 6 igniting atomized fuel supplied from a fuel spray nozzle 3 to the burner 2, and the fuel is ignited. A flame detecting means 7 for detecting a flame is provided, and the combustion fan 1 and the fuel pump 5 are started by the operation operation so that the air and the fuel are burned.
In a petroleum combustor provided with a safety device for stopping the operation of the burner 2 when the flame detecting means 7 detects no flame after a lapse of a predetermined time Tx from a certain time after the start of the driving operation, the discharge ignition device 6 When the time Tx counts up, the operation is stopped, and the burner 2 is provided with an initial operation confirmation means 8, and when the burner 2 is operated when the initial operation confirmation means 8 is operated, after a predetermined time elapses, The flame detecting means 7 for detecting the presence or absence of a flame has been operating for a predetermined time, and the flame detecting means 7 has detected the combustion flame before reaching the predetermined time Tx. Tx
When the flame is detected even a little, the spark discharge can be continued by the control device which restarts the counting.

Further, if the first operation confirming means 8 is operated by operating the reset switch 9, even if only air is sent to the burner 2 during the actual first operation and a misfire occurs, the reset switch 9 is reset. Even when the operation start operation is repeated by the operation, it can operate as the initial operation confirmation means 8.

Further, an air venting means 10 is provided in the fuel pipe 4 on the oil tank side of the fuel pump 5, and after the air in the fuel pipe 4 from the fuel tank to the air venting means 10 is discharged, the first operation of the oil combustor is started. Is performed, the amount of air in the fuel pipe 4 is reduced, and it is not necessary to repeat the first operation operation many times.

[0011]

According to the present invention, the fuel pump 5 and the discharge ignition device 6 can be operated for a short time immediately after the burner 2 is installed or in the first operation after the fuel has run out and the air has entered the fuel pipe. When the flame can be detected, the fuel may be sent to the burner 2 and may continue to burn with the spark of the discharge ignition device 6. In such a state, the flame is generated at the time of the initially set predetermined time Tx. Even if it cannot be detected, the discharge igniter 6 continues to operate by automatically resetting the predetermined time Tx, so that the combustion of the air-mixed fuel can be continued with a small flame that cannot be detected by the flame detection means 7, and the ignition mistake can be prevented. The number of restart operations by detection has been reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure will be described with reference to the drawings showing an embodiment. Reference numeral 1 denotes a combustion fan for supplying combustion air to a burner 2;
Numeral 4 denotes a fuel spray nozzle which is viewed from the burner 2, 4 denotes a fuel pipe connecting between a fuel tank (not shown) and the fuel spray nozzle 3, and 5 denotes a fuel pump attached to the fuel pipe 4 near the fuel spray nozzle 3. is there.

In the burner 2 of the oil combustor shown in FIG. 2, reference numeral 11 denotes a cylindrical blower tube to which the combustion air from the combustion fan 1 is sent, and reference numeral 12 denotes a blower tube 11 whose tip is located at the tip of the blower tube 11. The combustion cylinder 12 is provided with a bottomed cylindrical combustion cylinder. The combustion cylinder 12 has a large number of air holes formed in a side wall, and a fuel inlet 12a formed in the center of the bottom plate. A fuel spray nozzle 3 is seen through the fuel inlet 12a, and a swirl vane is formed in a bottom plate around the fuel inlet 12a. The air of the combustion fan 1 is provided with an air hole in the side wall and a swirl of the bottom plate. The blades and the fuel cylinder together with the atomized fuel from the fuel inlet 12a
Sent inside.

Reference numeral 6 denotes a fuel spray nozzle 3 and a combustion tube 12
Discharge ignition device located between the fuel inlet 12a of the
Is a flame detecting means which is attached to the base of the blower cylinder 11 and comprises an optical sensor which detects the brightness of the flame in the combustion cylinder 12 from the swirling blades of the combustion cylinder 12 and the fuel inlet 12a. This is a fuel filter attached to the fuel pipe 4 on the tank side.

Reference numeral 14 denotes an ignition switch constituting an operation switch, 15 denotes a fire extinguishing switch constituting an operation switch, 16
Is a burner control device for controlling the operation of the combustion fan 1, the discharge ignition device 6, the fuel pump 5 and the like. The burner control device 16 is operated by receiving data of presence or absence of flame from the flame detection means 7. It incorporates the function of an ignition safety device.

The above configuration is a basic configuration of a conventional pressure spray burner. The operation will be described with reference to a time chart shown in FIG. 4. When the operation of the burner 2 is instructed, the combustion fan 1 starts rotating. Air is sent into the burner 2 and into the combustion chamber following the burner 2, and at time T1 when the burner 2 and the combustion chamber are filled with fresh air, the discharge igniter 6 is activated to emit sparks from the tip. At time T2, at which time a stable spark is obtained, the fuel pump 5 is activated to eject mist fuel from the fuel spray nozzle 3, and the pressure of the mist fuel is constant after the fuel pump 5 is activated. Then, the spark is ignited by the spark of the discharge ignition device 6, and the fuel is burned in the combustion tube 12 and the combustion chamber.

If the flame is detected by the flame detecting means 7 when the combustion is started and a predetermined time Tx has elapsed from the time T2, the discharge ignition device 6 is stopped and the normal combustion is started. Further, when the combustion fan 1, the discharge igniter 6, the fuel pump 5 and the like are not ignited due to malfunction, or they are ignited, they are immediately extinguished, and the flame detecting means 7 cannot detect the flame when a predetermined time Tx has elapsed. At times, the ignition safety device operates to stop the operation of the fuel pump 5 and the discharge ignition device 6 to perform the fire extinguishing operation.

Therefore, at the time of the first operation in which no fuel is contained in the fuel pipe 4 immediately after the burner 2 is installed or the like, the fuel pump 5 uses only air from the start of the operation until a predetermined time Tx elapses. And the fuel is not ejected from the fuel spray nozzle 3, and the ignition safety device operates. For this reason, the operation must be restarted. However, since the operation of the ignition safety device continues until the fuel can be sprayed stably, a number of operation operations are required.

As shown in the time chart of FIG. 4, the detection of the ignition mistake is performed not only when the air is blown out from the fuel spray nozzle 3 but also when the air-mixed fuel is sent.
It operates even when stable atomized fuel cannot be ejected. Even if the flame detecting means 7 detects the presence of flame for a short time due to air entrained fuel during the predetermined time Tx, the flame is detected when the predetermined time Tx is reached. If it is not detected, the ignition safety device operates to stop the operation of the burner 2. Then, by repeating the operation start operation again, if the flame can be detected at the predetermined time Tx, the burner 2 can shift to the normal combustion.

However, the fact that ignition has been confirmed as shown in the time chart of FIG. 4 indicates that fuel is being ejected from the fuel spray nozzle 3, and when the operation is started again, the operation is restarted from the beginning. Therefore, during the delay from the start of operation of the fuel pump 5 to the ignition by the discharge spark, unignited fuel is sent to the combustion cylinder 12 and the combustion chamber, and this fuel is transmitted to the combustion cylinder 12 and the combustion chamber. After sticking and shifting to normal combustion, it is vaporized by combustion heat to generate incomplete combustion gas.

The fact that ignition was detected with air-mixed fuel means that even if the amount of air subsequently increased and the flow rate of sprayed fuel decreased, combustion was continued with a small flame due to the spark of the discharge ignition device 6. Although it is excellent in terms of safety to extinguish the burner 2 by saying that the flame cannot be detected as in the prior art, the burner 2 is actually affected by the performance of the flame detecting means 7 and the flame is difficult to detect. In the case of the shape and rough flame detecting means 7, frequent repetition of the driving operation is required, so that a large amount of fuel adheres to the burner 2 and the incomplete combustion gas is continuously discharged for a long time.

The present invention solves the above-mentioned problems. Reference numeral 8 denotes an initial operation confirmation means in which no fuel is contained in the fuel pipe. When the operation is performed in such a state, the internal data of the burner control device 16 is cleared, and the burner control is performed until the normal combustion state when the operation is started from this state. Apparatus 1
6 operates according to the time chart of FIG.

That is, the discharge ignition device 6 is configured to stop its operation when the predetermined time Tx counts up.
The flame detecting means 7 is in an operating state before the predetermined time Tx, and can output an output with a flame during the counting of the predetermined time Tx as shown in FIG. At the time of the first operation without fuel in the fuel pipe 4, the air-mixed fuel is always sent out before normal combustion, and the amount of air mixed with the fuel is eventually reduced to obtain a normal atomized fuel. Therefore, there is a very high possibility that a small flame remains even after the flame can be detected by the flame detecting means 7 once the flame can be detected.

According to the present invention, the start of the counting of the predetermined time is not only related to the start of the driving operation, but when the flame is detected, the counting of the predetermined time Tx can be started again from the time when the flame is not detected. It is like that. Therefore, if no flame is detected during the predetermined time Tx, the ignition safety device operates to stop the operation of the burner 2 as in the conventional case. Further, since the predetermined time Tx is counted, the operation can be shifted to the normal combustion without stopping the operation of the burner 2 from the time when the air entrained fuel starts to be ejected from the fuel spray nozzle 3.

The first operation confirmation means 8 can store the state in which various internal data of the burner control device 16 are cleared at the time of the first operation, and can clear the storage when the normal combustion is started. As a simple operation, the initial operation confirmation means 8 may be constituted by the reset switch 9. When the operation is started again by the reset switch 9 when the flame is not detected, the internal operation of the burner control device 16 can be changed. There is no need to store the state in which the data has been cleared.

That is, when the first driving operation is performed, the operation is stopped by blowing out only air for a predetermined time Tx. Blowing out from the spray nozzle 3 automatically resets the predetermined time Tx,
The same operation and effect can be obtained.

If the initial operation without fuel in the fuel pipe 4 is artificially confirmed by the reset switch 9, not only when the burner 2 is completely newly installed but also when the fuel runs out, the fuel runs out. Confirmation of the initial operation when the battery runs out can be realized by the operation of pressing the reset switch 9, so that the application range of the present invention is expanded.

Furthermore, the fuel pipe 4 from the oil tank to the burner 2 may be quite long, and bleeding air only during the operation during this time requires a long time to repeat the operation. Reference numeral 10 denotes an air bleeder attached to the fuel filter 13 on the oil tank side of the fuel pump 5. If the air bleeder 10 is opened and fuel flows while extruding air at a pressure difference, it can be evacuated by an operation operation. The only air that must be present is the air in the fuel pipe 4 from the fuel filter 13 to the fuel spray nozzle 3.
The number of driving operations until the air escapes can be reduced.

[0029]

As described above, according to the present invention, immediately after installation or at the time of the first driving operation in which air enters the fuel pipe 4 due to running out of fuel, the flame detecting means 7 sets the predetermined time T set in advance.
x, and when the flame detection means 7 outputs a signal indicating that there is at least one flame while the predetermined time Tx is being counted, the predetermined time Tx is restarted from the beginning. Since the fuel spray nozzle 3 starts to emit not only air but also air-mixed fuel, the discharge ignition device 6 can be operated continuously even when the flame is sometimes interrupted or burning with a small flame. The number of actuations of the safety device due to extinction has become extremely small, and frequent ignition and extinguishing operations do not have to be performed.

The fact that the safety device has become difficult to operate even after a new installation or running out of oil indicates that the discharge ignition device 6
Can continuously operate and continue burning with the spark of the discharge spark. Therefore, the only fuel that adheres to the wall of the burner 2 or the wall of the combustion chamber is a large amount of particles sprayed from the fuel spray nozzle 3 and is difficult to burn. Since the number of times of the driving operation in which the gas easily adheres is reduced, the amount of the fuel adhering to the wall surface is significantly reduced. For this reason, even if the fuel adhering to the burner 2 or the combustion chamber is vaporized after the normal combustion state, the generation of incomplete combustion gas can be reduced because it is slight.

The first operation with air in the fuel pipe 4 is not only when the burner 2 is installed but also when the fuel pipe 4 is filled with air due to lack of fuel. If the reset switch 9 that can be operated is used, the operation of the reset switch 9 can be recognized as the first operation operation. Therefore, the reset switch 9 is used instead of the operation of the ignition switch or the fire extinguishing switch of the operation operation.
Now you can work with.

The fuel pipe 4 is located near the fuel pump 5.
If the air bleeding means 10 is provided, the air from the oil tank to the air bleeding means 10 can easily escape, so that the fuel pipe 4
The amount of air remaining in the fuel cell is reduced, the number of ignition mistakes before starting normal combustion is reduced, and it is not necessary to perform the first operation operation many times.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a sectional view of a burner portion of the oil combustor showing the embodiment of the present invention.

FIG. 3 is a time chart showing the operation of each component of the control device according to the embodiment of the present invention.

FIG. 4 is a time chart showing an example of the operation of each component of the conventional control device.

[Explanation of symbols]

 Tx Predetermined time 1 Combustion fan 2 Burner 3 Fuel spray nozzle 4 Fuel pipe 5 Fuel pump 6 Discharge igniter 7 Flame detection means 8 Initial operation confirmation means 9 Reset switch 10 Air release means

Claims (3)

[Claims] 1. A fuel spray nozzle 3 is attached to a burner 2 to which combustion air is sent by a combustion fan 1, and the fuel spray nozzle 3 and a fuel tank are connected by a fuel pipe 4. A fuel pump 5 is mounted on the way, and the burner 2 is provided with a discharge ignition device 6 for igniting atomized fuel supplied from the fuel spray nozzle 3 and a flame detecting means 7 for detecting the ignited flame. The combustion fan 1 and the fuel pump 5 are started to supply air and fuel to the burner 2.
In a petroleum combustor provided with a safety device for stopping the operation of the burner 2 when the flame detecting means 7 detects no flame after a lapse of a predetermined time Tx from a certain time after the start of the driving operation, the discharge ignition device 6 When the time Tx counts up, the operation is stopped, and the burner 2 is provided with an initial operation confirmation means 8, and when the burner 2 is operated when the initial operation confirmation means 8 is operated, after a predetermined time elapses, The flame detecting means 7 for detecting the presence or absence of a flame has been operating for a predetermined time, and the flame detecting means 7 has detected the combustion flame before reaching the predetermined time Tx. An oil burning device with an air venting function, comprising a control device for recounting Tx. 2. The petroleum combustion apparatus with an air venting function according to claim 1, wherein the first operation confirmation means is operated by operating a reset switch. 3. An air vent means 10 is provided in the fuel pipe 4 on the oil tank side of the fuel pump 5, and after the air in the fuel pipe 4 from the fuel tank to the air vent means 10 is discharged, the first operation of the oil combustor is started. 2. The oil burning apparatus with an air venting function according to claim 1, wherein: