JP2009287881A - Fuel feeder for combustor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel feeder structure capable of supplying fuel to a constant fuel level apparatus without carrying out air bleeding operation of a fuel pipe after installation of a combustor or when there is no fuel. <P>SOLUTION: The constant fuel level apparatus 5 built in with a float valve 4 is provided in a middle of the fuel pipe 3 connecting a separately provided fuel tank 1 and burner 2, a fuel pump 6 sending fuel to the burner 2 and a fuel level detection sensor 9 detecting a fuel level in the constant fuel level apparatus 5 are attached to the constant fuel level apparatus 5, and an opening and closing valve 7 is provided in a fuel inlet 5a of the constant fuel level apparatus 5. The fuel level detection sensor 9 is actuated when a power source is turned on in a controller 10 of the combustor, and since the fuel inlet 5a is opened by energizing the opening and closing valve 7 when the fuel level detection sensor 9 can not detect a predetermined fuel level A of a lower position, fuel of the fuel tank 1 can be supplied to the constant fuel level apparatus 5 before starting of initial operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for controlling a constant oil level device in which a fuel provided in an oil combustor has a constant oil level.

  An oil combustor that burns by supplying fuel from a separate oil tank has a constant oil level device in the middle of the fuel pipe connecting the oil tank and the burner, and the oil level position in the constant oil level device. The float valve closes when fuel is sent from the oil tank to the set oil level, and the fuel pump attached to the upper part of the constant oil level device sucks the fuel. When the oil is supplied to the burner, the oil level is lowered, the float valve is opened, the fuel flows in, and when the oil level is set again, the float valve is closed, and the constant oil level is maintained by repeating this operation.

If the oil combustor is used for a long time, foreign matter such as dust and rust mixed in the oil tank will be sent, and this foreign matter may be clogged in the constant oil level device, causing the float valve to malfunction. There was a risk that the float valve could not be completely closed and fuel overflowed from the oil leveler. As a countermeasure, an open / close valve is provided at the fuel inlet of the constant oil level device to which the fuel pipe is connected, and the open / close valve is opened by energizing the open / close valve only during operation of the combustor. Is equipped with a safety device that can prevent fuel leakage from the constant oil level device even when the float valve malfunctions by closing the fuel inlet and shutting off the fuel supply to the constant level device. Yes (see Patent Document 1).
JP 2002-257336 A

  In the configuration in which fuel is supplied to the constant oil level device only during operation of the combustor as described above, fuel is not supplied to the constant oil level device immediately after the combustor is installed, and the on-off valve is energized during the initial operation. For the first time, the fuel inlet opens and the fuel in the oil tank is sent to the constant oil level device. For this reason, even if the fuel pump is driven by operating the operation switch, only the air in the constant oil level device is supplied at first, but fuel is not supplied to the burner, and the burner stops due to an ignition error. The operation is started again by operating the operation switch, and this operation is repeated until the air in the fuel pipe is released, so that the fuel is filled in the constant oil level device and the fuel pump can supply the fuel to the burner. Combustion can be started.

  However, when the operation of the combustor stops, the on-off valve closes the fuel inlet, so it takes time for the fuel pipe air to completely escape and fuel to be sent to the constant oil leveler. This operation had to be repeated several times until the air in the fuel pipe was completely removed, and the operation at the start of the first operation after the installation of the combustor was very troublesome.

  In addition, when the combustor stops running out of fuel, air enters the fuel pipe, so the same operation as the initial operation is required after refueling the oil tank. When I didn't understand it well, the burner made an ignition mistake even though fuel was replenished.

The present invention solves the above-described problems, and a constant oil level device 5 provided with a fuel pipe 3 for connecting a separately installed oil tank 1 and a burner 2 of a combustor and having a float valve 4 built in the middle of the fuel pipe 3. And place
The constant oil level is maintained by opening and closing the float valve 4 at the oil level position in the constant level device 5, and the fuel pump 6 is attached to the upper portion of the constant level device 5, and the fuel pipe 3 is connected to the constant oil level. The opening / closing valve 7 is attached to the fuel inlet 5a of the face unit 5, the opening / closing valve 7 opens the fuel inlet 5a by the operation start signal of the operation switch 8, and the fuel pump 6 passes the fuel in the constant oil level unit 5 to the burner 2. In the combustor in which the open / close valve 7 closes the fuel inlet 5a by the operation stop signal of the operation switch 8 and shuts off the fuel supply to the constant oil level device 5, the constant oil level device 5 has a constant value. A liquid level detection sensor 9 for detecting the oil level in the oil level device 5 is attached, and the control device 10 of the combustor operates the liquid level detection sensor 9 when the power is turned on, and the liquid level detection sensor 9 is the lower predetermined oil level A. Is not detected, the on-off valve 7 is energized to open the fuel inlet 5a, and the operation switch 8 Before the start of the operation the fuel oil tank 1 is characterized in that it is supplied to the Teiabura surface vessel 5.

  Further, the control device 10 is provided with an alarm means 11 that operates when the combustor is abnormal, and the control device 10 is an alarm means when the liquid level detection sensor 9 does not detect the lower predetermined oil level A after a predetermined time from power-on. Therefore, the user can be informed when fuel is not supplied to the constant oil level device 5 after installing the combustor.

  Further, the control device 10 energizes the on-off valve 7 when the liquid level sensor 9 does not detect the lower predetermined oil level A when the power is turned on, and the liquid level detection sensor 9 detects the lower predetermined oil level A. When detected, the energization of the on-off valve 7 is stopped after a predetermined time. Therefore, after the fuel is supplied to the constant oil level device 5, the fuel inlet 5 a is closed to supply the fuel to the constant oil level device 5. Shut off.

  When the liquid level detection sensor 9 does not detect the lower predetermined oil level A during operation of the combustor, the control device 10 stops the operation of the combustor while maintaining the energization of the on-off valve 7. Since the on / off valve 7 is kept energized until the liquid level detection sensor 9 detects the predetermined oil level A, when the fuel runs out and the operation of the combustor stops, the oil tank is replenished. The fuel can be supplied to the constant oil level device 5 only.

  In the present invention, when a power cord is connected to an outlet and energization of the control device 10 is started when the combustor is installed, the control device 10 activates the liquid level detection sensor 9, and the liquid level detection sensor 9 is set to a predetermined lower level oil. When the surface A is not detected, the on-off valve 7 is energized to open the fuel inlet 5a, so that the fuel in the oil tank 1 can be supplied to the constant oil level device 5 before the start of the initial operation of the combustor. . For this reason, as soon as the fuel pump 6 is driven by operating the operation switch 8, fuel can be supplied to the burner 2, and the operation of the operation switch 8 is repeated many times even at the start of the first operation after the combustor is installed. There is no need to perform this operation, and since the control device 10 automatically performs a confirmation operation when power is supplied to the combustor, there is no need for the operator to perform a special operation before starting the first operation. It became easy to start using the combustor.

  Further, when the power is turned on, the on-off valve 7 opens the fuel inlet 5a and the fuel in the oil tank 1 is sent to the constant oil level device 5, the liquid level detection sensor 9 detects the predetermined oil level A. The float valve 4 is clogged with dust or the like by stopping energization to the on-off valve 7 and closing the fuel inlet 5a after a predetermined time after the liquid level detection sensor 9 detects the lower predetermined oil level A. Even when a malfunction occurs, it is safe without causing fuel leakage from the constant oil level device 5.

  In addition, when the liquid level detection sensor 9 does not detect the predetermined oil level A even after a lapse of a certain time after the power is turned on, the alarm means 11 is activated, and the constant oil level 5 is turned on before starting the operation of the combustor. Since the operator is informed that the fuel is not being supplied, and the fuel is checked by recognizing that the fuel pipe 3 has been misconnected or forgotten to insert the fuel, the combustor will not be operated without the fuel. Is.

  Further, when the liquid level detection sensor 9 does not detect the predetermined oil level A during the operation of the combustor, the fuel shortage alarm is output and the operation of the combustor is stopped. Is configured to be maintained until the liquid level detection sensor 9 detects the predetermined oil level A. For this reason, even if the fuel tank 1 is replenished after the fuel has been stopped, the fuel inlet 5a remains open, so that fuel is also supplied to the constant oil level device 5 so that the combustor can be operated. Therefore, it is not necessary to perform a troublesome operation even when starting the first operation after stopping due to running out of fuel, and the operation can be easily resumed only by operating the operation switch 8.

  The present invention will be described with reference to the embodiments shown in the drawings. Reference numeral 12 denotes a frame of an oil combustor, 2 a burner installed in the frame 12, 5 a constant oil level device arranged in the frame 12, and 6 a constant oil. A fuel pump mounted on the surface unit 5, 13 is a fuel pipe provided between the fuel pump 6 and the burner 2, and 14 is a nozzle provided at the tip of the fuel pipe 13. Is sucked by the fuel pump 6 and supplied dropwise from the nozzle 14 to the bottom surface of the burner 2 through the fuel pipe 13.

  The burner 2 of the embodiment shown in the figure is composed of a pot type burner, 15 is a pot constituting a vaporization section and a primary combustion section, 16 is a combustion blower for supplying combustion air to the pot 15, and 17 is a combustion blower. A wind tunnel to which air is sent, 15a is a number of air holes provided in the side wall of the pot 15, and the pot 15 is disposed in the wind tunnel 17, and the air sent to the wind tunnel 17 by the combustion blower 16 is It is supplied into the pot 15 from the air hole 15a.

  18 is an ignition heater disposed at a distance from the side wall of the pot 15 to the bottom surface of the pot 15, 19 is an auxiliary combustion member provided in the pot 15, and the fuel dripped from the nozzle 14 into the pot 15 is the ignition heater. 18 and the bottom of the pot 15 which is heated by the combustion heat, the combustion air supplied from the air holes 15a while performing the initial combustion, the fuel vaporized by the auxiliary combustion member 19, and the combustion air are mixed. Complete combustion above 15.

1 is a separate oil tank installed outside the frame 12, 3 is a fuel pipe connecting the oil tank 1 and the constant oil level device 5 in the frame 12, and 5a is a fixed pipe to which the fuel pipe 3 is connected. The fuel inlet 5b of the oil level device 5 is a supply port that opens into the constant oil level device 5, and 4 is a float valve that opens and closes the supply port 5b built in the constant oil level device 5. Is sent from the fuel inlet 5a to the constant oil level 5 through the fuel pipe 3, and the float of the float valve 4 rises. When the inside of the constant level 5 reaches the set oil level, the float valve 4 opens the supply port 5b. The fuel supply to the constant oil level device 5 is stopped.
Then, when the fuel in the constant oil level device 5 is sucked by the fuel pump 6 and the oil level is lowered, the float valve 4 opens the supply port 5b and the fuel flows into the constant oil level device 5 to set oil again. When the surface is reached, the float valve 4 closes the supply port 5b, and the constant oil level device 5 is maintained at the constant oil level by repeating this operation.

7 is an open / close valve composed of a solenoid valve attached to the fuel inlet 5a of the constant oil level device 5, 8 is a combustor operation switch, 10 is a control device for controlling the operation of the combustor, and the control device 10 is operated. The on / off valve 7 is energized by the operation start signal of the switch 8 to open the fuel inlet 5a. During the operation of the combustor, the fuel in the oil tank 1 is supplied into the constant oil level device 5, and the fuel pump 6 is supplied with constant oil. The fuel in the surface unit 5 is sucked and supplied to the burner 2.
On the other hand, the energization of the on / off valve 7 is stopped by the operation stop signal of the operation switch 8 and the fuel inlet 5a is closed. During the stop of the combustor, the fuel inlet 5a is closed by the on / off valve 7 and the constant oil level 5 The supply of fuel to the oil tank 1 is interrupted, and foreign matter such as dust and rust mixed in the oil tank 1 is sent to the constant oil level device 5, and this foreign matter is clogged in the supply port 5 b, causing the float valve 4 to malfunction. Even when the fuel supply cannot be completely stopped due to the waking up, it is possible to prevent the fuel leakage from the constant oil level device 5.

  By the way, conventionally, when the combustor is installed, the fuel inflow port 5a remains closed. Therefore, no fuel is supplied to the constant oil level device 5, and the fuel pipe 3 and the constant oil level device 5 have no fuel. The fuel is not supplied, and the fuel in the oil tank 1 flows to the fuel pipe 3 only when the operation is started by the operation switch 8 and the on-off valve 7 is energized to open the fuel inlet 5a. For this reason, immediately after the operation is started, the fuel pump 6 cannot suck the air in the constant oil level device 5 and supply the fuel to the burner 2, and the control device 10 detects the ignition error of the burner 2 and stops the operation. Therefore, the operation is performed again by the operation switch 8, but when the combustor is stopped, the energization of the on-off valve 7 is stopped and the fuel inlet 5a is closed, so that the fuel pipe 3 and the constant oil level device 5 are closed. It takes time for the air inside to completely escape, and it is necessary to repeat this operation several times until the fuel is stably supplied to the burner 2, and the operation at the first operation immediately after the installation of the combustor is very It was troublesome.

  The present invention proposes a combustor that can be easily used even during the initial operation immediately after the combustor is installed, and 9 is an oil level detection sensor provided in the constant oil level device 5, The liquid level detection sensor 9 detects the presence or absence of fuel by changing the resistance value when the oil level in the constant oil level device 5 is above and below the sensor unit. The sensor 9 is set to detect a predetermined oil level A lower than the set oil level of the float valve 4.

  At the time of installing the combustor, when power is supplied by connecting a power cord (not shown) to an outlet, the control device 10 starts energizing the liquid level detection sensor 9, and the predetermined oil level A is transferred from the liquid level detection sensor 9. When an undetected signal is detected, the on-off valve 7 is energized. When the on-off valve 7 is energized and the fuel inlet 5a is opened, the fuel in the oil tank 1 flows into the fuel pipe 3 and is sent to the constant oil level device 5. When the inside of the constant oil level device 5 reaches the set oil level, the float valve 4 closes the supply port 5b and stops the supply of fuel.

For this reason, before the first operation is started by the operation switch 8, the air in the fuel pipe 3 has already escaped and the constant oil level device 5 is filled with fuel, and when the operation is started by the operation switch 8, the fuel pump 6 sucks the fuel in the constant oil level device 5 and the fuel is supplied to the burner 2, so that the burner 2 can start combustion without causing an ignition error, and during the first operation immediately after the combustor is installed. However, troublesome repeated operations are no longer necessary, and it is easy to start using them.
Further, in this configuration, since the control device 10 confirms that the combustor has just been installed and supplies fuel to the constant oil level device 5, it is not necessary for the operator to perform a special operation before starting the initial operation. In addition, the combustor can be used even during the initial operation only by operating the operation switch 8 in the same manner as during normal use.

  When power is supplied to the combustor, the control device 10 detects a signal indicating that the predetermined oil level A is not detected from the liquid level detection sensor 9, energizes the on-off valve 7 and opens the fuel inlet 5a. Since fuel is supplied to the constant oil level device 5 and the oil level rises, the liquid level detection sensor 9 outputs a detection signal of the predetermined oil level A.

20 is a timer means provided in the control device 10, and 11 is an alarm means for turning on a warning lamp or sounding an alarm when the combustor is abnormal. When the power is supplied to the combustor, the control device 10 detects the liquid level detection sensor. The timer means 20 starts counting when a non-detection signal for the predetermined oil level A is detected from 9 and the liquid level detection sensor 9 does not output a detection signal for the predetermined oil level A until the timer means 20 finishes counting. When the alarm means 11 is activated.
If the fuel tank 3 is forgotten to be inserted, the fuel pipe 3 is misconnected, or the outlet of the oil tank 1 to which the fuel pipe 3 is connected is provided with an open / close valve, the valve may be left open. Is not supplied, the liquid level detection sensor 9 does not output a detection signal of the predetermined oil level A. Therefore, the liquid level detection sensor 9 does not output the predetermined oil level A even after a predetermined time has elapsed since the power was turned on. Since the alarm means 11 is activated when the liquid level detection sensor 9 does not output the detection signal for the predetermined oil level A even after a predetermined time has elapsed since the power supply, the alarm means 11 is activated. The face unit 5 can be informed that no fuel is being supplied, and the operator notices an abnormality before starting the operation and checks the fuel, so that the operation is not performed without the fuel.

  Even when the on-off valve 7 is energized and the fuel inlet 5a remains open, the float valve 4 closes the supply port 5b to the constant oil level 5 when the constant level 5 reaches the set oil level. However, when the float valve 4 malfunctions, the fuel is supplied beyond the set oil level, which may cause fuel leakage from the constant oil level device 5.

In another embodiment of the present invention, the controller 10 counts again when the liquid level detection sensor 9 outputs a predetermined oil level A detection signal after the power is supplied and the on-off valve 7 is energized. When the timer means 20 counts for a predetermined time, the energization of the on-off valve 7 is stopped.
While the timer means 20 is in operation, the on-off valve 7 opens the fuel inlet 5a and fuel is sent to the constant oil level device 5. When the constant oil level device 5 reaches the set oil level, the float valve 4 is closed. Thus, when the fuel supply to the constant oil level device 5 is stopped and the timer means 20 counts for a predetermined time, the on-off valve 7 closes the fuel inlet 5a, and even when the float valve 4 malfunctions, The fuel supply to the constant oil level device 5 can be surely cut off, and even if the fuel is supplied to the constant oil level device 5 before the first operation of the combustor is started, fuel leakage from the constant oil level device 5 is generated. There is no.

  When the fuel in the oil tank 1 runs out during operation of the combustor, a signal indicating that the predetermined oil level A is not detected is output from the liquid level detection sensor 9 of the constant oil level device 5, and the control device 10 operates the combustor. Is stopped and the alarm means 11 is operated to output a fuel out alarm. When the operation is stopped due to running out of fuel, air enters the fuel pipe 3 and the constant oil level device 5, so the first operation after refueling the oil tank 1 is the first operation immediately after the combustor is installed. The same operation was necessary.

In the present invention, when a signal indicating that the predetermined oil level A is not detected is output from the liquid level detection sensor 9 during operation of the combustor, the operation of the combustor is stopped and the alarm means 11 outputs an alarm for running out of fuel. However, at this time, the energization to the on-off valve 7 is not stopped, and the energization to the on-off valve 7 is maintained until the detection signal of the predetermined oil level A is output from the liquid level detection sensor 9 again. The energization of the on-off valve 7 is stopped a predetermined time after the detection sensor 9 outputs the detection signal of the predetermined oil level A, and the fuel inlet 5a is closed.
For this reason, when the fuel in the oil tank 1 runs out, if the operator replenishes the oil tank 1, the fuel in the oil tank 1 is sent to the constant oil level device 5, and the fuel pipe 3 or the constant oil level device 5. When the operation is started by the operation switch 8, the fuel pump 6 sucks the fuel in the constant oil level device 5 and is supplied to the burner 2 to start combustion. In addition, even during the first operation after refueling, the combustor can be used immediately by simply operating the operation switch 8, and it is not necessary for the operator to perform a special operation, thereby improving usability.

It is a block diagram which shows the Example of this invention. 1 is an oil combustor showing an embodiment of the present invention. It is principal part sectional drawing of the constant oil level device which shows the Example of this invention. It is a flowchart which shows the state at the time of the power supply in the Example of this invention. It is a flowchart which shows the state in the driving | operation in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil tank 2 Burner 3 Fuel pipe 4 Float valve 5 Constant oil level device 5a Fuel inlet 6 Fuel pump 7 On-off valve 8 Operation switch 9 Liquid level detection sensor 10 Controller 11 Alarm means A Predetermined oil level

Claims (4)

A constant oil level device (5) provided with a fuel pipe (3) for connecting a separately installed oil tank (1) and a burner (2) of a combustor and incorporating a float valve (4) in the middle of the fuel pipe (3). )
While maintaining the constant oil level by opening and closing the float valve (4) at the oil level position in the constant oil level device (5),
A fuel pump (6) is attached to the top of the constant oil level device (5), and an on-off valve (7) is attached to the fuel inlet (5a) of the constant oil level device (5) to which the fuel pipe (3) is connected, The opening / closing valve (7) opens the fuel inlet (5a) in response to the operation start signal of the operation switch (8), and the fuel pump (6) supplies the fuel in the constant oil level device (5) to the burner (2). In the combustor in which the on-off valve (7) closes the fuel inlet (5a) by the operation stop signal of the operation switch (8) and shuts off the fuel supply to the constant oil level device (5).
The level oil level sensor (5) is provided with a liquid level detection sensor (9) for detecting the oil level in the level oil level level sensor (5), and the combustor control device (10) is a liquid level detection sensor when the power is turned on. (9) is operated, and when the liquid level detection sensor (9) does not detect the lower predetermined oil level (A), the on-off valve (7) is energized to open the fuel inlet (5a) and operate. A fuel supply structure for a combustor, characterized in that the fuel in the oil tank (1) is supplied into the constant oil level device (5) before starting the initial operation by the switch (8). The control device (10) includes alarm means (11) that is activated when the combustor is abnormal,
The control device (10) operates the alarm means (11) when the liquid level detection sensor (9) does not detect the lower predetermined oil level (A) after a predetermined time from turning on the power. The fuel supply device for the combustor as described.   The control device (10) energizes the on-off valve (7) when the liquid level sensor (9) does not detect the lower predetermined oil level (A) when power is turned on, and the liquid level detection sensor (9). 2. The fuel supply device for a combustor according to claim 1, wherein when the predetermined lower oil level (A) is detected, energization of the on-off valve (7) is stopped after a predetermined time.   When the liquid level detection sensor (9) does not detect the lower predetermined oil level (A) during operation of the combustor, the control device (10) performs combustion while maintaining the energization of the on-off valve (7). The combustor fuel supply according to claim 1, wherein the operation of the combustor is stopped and the energization of the on-off valve (7) is maintained until the liquid level detection sensor (9) detects the predetermined oil level (A). apparatus.

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