JP3821705B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus used for a water heater or a heating device.
[0002]
[Prior art]
Conventionally, in this type of combustion apparatus, as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-21606, a vaporization type combustion apparatus that vaporizes and burns liquid fuel once is used as a heater during an ignition operation. When energized and the carburetor is heated and reaches a predetermined temperature, the blower is activated and combustion air is supplied, then the fuel pump is activated and sprayed from the nozzle to the carburetor, and vaporized fuel and primary air are separated. The mixture was mixed and ejected from the primary flame mouth. At that time, the igniter was discharged to ignite the air-fuel mixture and start combustion.
[0003]
And at the time of this ignition operation, by operating the blower in a state where the damper as the air adjusting means is closed and the air passage is closed, the amount of combustion air can be reduced even if the rotational speed of the blower is large, It was possible to maintain a high blowing pressure at the time of ignition, thereby preventing a backfire due to a rapid rise in the internal pressure of the furnace due to a back wind or ignition.
[0004]
In this conventional combustion apparatus, when ignition is performed and ignition is not detected, the fuel pump and igniter are operated again to perform re-ignition, and when ignition is still not detected, the fuel pump and igniter are switched off. Reactivate it again and re-ignite it.If ignition is still not detected, it is judged as an unignited error, stops all operations including the ignition operation, displays an unignited error, and displays it to a specialist. I had it checked and repaired.
[0005]
[Problems to be solved by the invention]
By the way, in this conventional one, the wind enters from the exhaust port due to the strong wind and temporarily becomes a strong reverse wind, or the stepping motor is used as a drive motor for driving the damper. If the ignition operation is performed without the damper being operated to the predetermined position and the ignition is not ignited, the fuel pump and the igniter are operated in the subsequent re-ignition operation and re-ignition operation. Therefore, the re-ignition operation or re-ignition operation will be performed without the damper operating to the predetermined position, eventually resulting in an unignited error, stopping all operations including the ignition operation, and displaying an unignited error Then, there was a drawback of having specialists inspect and repair.
Therefore, the present invention solves the above-described problem, and the ignition operation is performed without the ignition until the damper is not operated to a predetermined position due to a temporary strong headwind or a step-out of the drive motor that drives the damper. Therefore, the present invention provides a combustion apparatus that can prevent a non-ignition error due to a poor position of the damper.
[0006]
[Means for Solving the Problems]
The present invention pays attention to this point and solves the above-described drawbacks. In particular, in the present invention, in claim 1, a blower that supplies combustion air, a flow rate pump that supplies fuel oil to the fuel injection nozzle, and a fuel injection nozzle A vaporizer that vaporizes the fuel to be supplied, premixes the vaporized fuel and combustion air from the blower, a blower passage that guides the combustion air from the blower to the vaporizer, and the blower passage. A damper for varying the cross-sectional area of the air passage, a combustion section for burning the premixed gas premixed in the carburetor, ignition means for igniting the premixed gas in the combustion section, and a preheating gas in the combustion section. An ignition detection unit that detects that the mixed gas has ignited, moves the damper to the closed position, then operates the blower and the flow pump to generate the premixed gas, and ignites it with the ignition means. In combustion devices that perform ignition When the ignition detection unit does not detect the ignition in the ignition operation, the re-ignition operation in which the blower and the flow rate pump are restarted and the ignition means ignites, and the ignition detection unit detects the ignition in the re-ignition operation. If not, after the damper is moved to the closed position, a re-ignition operation is performed in which the blower and the flow rate pump are operated to ignite by the ignition means.
[0007]
Further, in the combustion apparatus according to claim 2 of the present invention, it is determined that an unignition error has occurred particularly when the ignition detection unit does not detect ignition in the re-ignition operation according to claim 1. In addition, the controller includes a control unit that outputs an error display signal and a display unit that displays an error using an error display signal output from the control unit.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to the combustion apparatus of the first aspect of the present invention, the blower 17 that supplies combustion air, the flow rate pump 27 that supplies fuel oil to the fuel injection nozzle 3, and the fuel oil supplied from the fuel injection nozzle 3 are vaporized. The vaporizer 1 that premixes the vaporized fuel oil and the combustion air from the blower 17, the air passage 16 that guides the combustion air from the blower 17 to the vaporizer 1, and the air passage 16 A damper 18 that varies the cross-sectional area of the air passage 16, a combustion unit 11 that combusts the premixed gas premixed in the carburetor 1, an ignition means 24 that ignites the premixed gas in the combustion unit 11, And an ignition detection unit 23 for detecting that the premixed gas is ignited in the combustion unit 11, and after moving the damper 18 to the closed position, the blower 17 and the flow pump 16 are operated to generate the premixed gas. Let it ignite it In the combustion apparatus that performs the ignition operation ignited at 24, when the ignition detection unit 23 does not detect the ignition in the ignition operation, the blower 17 and the flow rate pump 27 are operated again and the ignition means 24 performs the ignition again. When the ignition detection unit 23 does not detect ignition in the ignition operation and the re-ignition operation, the damper 18 is moved to the closed position, and then the blower 17 and the flow rate pump 27 are operated to ignite by the ignition means. Re-ignition operation is performed.
[0009]
As a result, when the damper 18 is not ignited even if it is in a predetermined position during the initial ignition operation, a quick re-ignition operation is performed to ignite, so that hot water supply is required by opening and closing the faucet or the like. The time from the start of combustion until the hot water supply operation is started can be shortened.
[0010]
In the initial ignition operation and re-ignition operation, if the damper 18 has not been ignited because it has not moved to a predetermined position for closing the air passage 16 for some reason, the ignition operation for restarting the damper 18. Therefore, it is possible to prevent the occurrence of an unignition error due to the defective position of the damper 18, reduce the inspection / repair of specialists due to the occurrence of the unignition error, and improve the usability.
[0011]
According to the combustion apparatus of claim 2 configured as described above, in the combustion apparatus of claim 1, it is determined that an unignition error has occurred when the ignition detection unit 23 does not detect ignition in the re-ignition operation. A control unit 42 that outputs an error display signal and a display unit that displays an error in response to an error display signal output from the control unit 42 are provided.
[0012]
As a result, the non-ignition error due to the position of the damper 18 is not generated, but the non-ignition is caused by another cause, but the user repeatedly performs the ignition operation in that state to damage the combustion device. Alternatively, it can be prevented from operating in an abnormal state, and the repairer can know that it is not the occurrence of an unignited error due to a poor position of the damper 18 at the time of inspection / repair by a specialist. Can be identified quickly, and inspection / repair time can be shortened.
[0013]
【Example】
Next, an example in which the combustion apparatus according to the present invention is applied to a water heater will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes an aluminum die-cast carburetor, which is vertically installed and has a heater 2 made of U-shaped sheathed heaters at the upper and lower portions thereof. The vaporizer supplied from the fuel injection nozzle 3 is evacuated. The primary air for combustion supplied from the jet outlet 5 at the tip of the guide path 4 where the fuel injection nozzle 3 is suspended is premixed to obtain a premixed gas.
[0014]
6 is a mixing chamber made of the same aluminum die cast that communicates with the vaporizer 1 through a communication port 7 at the bottom of the vaporizer 1, and an auxiliary heater 8 that is energized only for a predetermined time during preheating is cast into the bottom. A plurality of flame holes in which the premixed gas from the vaporizer 1 is rectified and mixed by flowing through the tapered portion 9 on the back side of the vaporizer 1, and the premixed gas from the mixing chamber 6 is arranged in a line. The portion 10 is ejected separately.
[0015]
11 is a combustion part formed in the upper part of the mixing chamber 6 on the back side of the vaporizer 1 and communicates with the premixed gas from the mixing chamber 6 and the air chamber 13 between the mixing chamber 6 and the outer frame 12. Combustion secondary air supplied from the secondary air holes 14 alternately provided adjacent to the section 10 is combusted in the combustion chamber 15.
[0016]
Reference numeral 16 denotes an air passage that supplies combustion air from the blower 17 to the combustion unit 10 as primary and secondary air, and controls the rotational speed of the blower 17 and controls the amount of combustion air by varying the cross-sectional area of the air passage 16. An inverted L-shaped damper 18 is provided.
[0017]
The damper 18 is driven by a stepping motor 20 that receives a drive pulse and rotates a drive shaft 19 to which the lower end of the damper 18 is fixed, and stands upright to close the air passage 16 in small thermal combustion including ignition. The air passage 16 has a ventilation area of only the air gap 21 on the outer periphery of the damper 18 and a plurality of air holes 22 provided on the extended line of the guide passage 4, and reduces the amount of combustion air while increasing the air pressure. In the opening direction, the amount of combustion air is varied according to the opening.
[0018]
Further, the stepping motor 20 is configured such that the drive shaft 19 does not slip and the stepping motor 20 does not fail even when the drive pulse is input in the closing and opening directions in the closed state and the maximum open state of the damper 18.
[0019]
Reference numeral 23 denotes an ignition detection unit made of a frame rod. When a flame is formed in the flame hole portion 10 by ignition of an ignition means 24 made of an igniter, an electric current flows by contact with the flame to detect the ignition. .
[0020]
Reference numeral 25 denotes an auxiliary tank that temporarily stores the fuel pumped up by the fuel pump 26, and supplies an appropriate amount of fuel from the fuel injection nozzle 3 to the vaporizer 1 through the oil feed pipe 28 when the flow rate pump 27 is driven.
[0021]
Reference numeral 29 denotes a heat absorbing fin that protrudes toward the combustion unit 11 on the back of the vaporizer 1, 30 denotes a stopper of the damper 18, and 31 denotes a shaft support that supports the drive shaft 19.
[0022]
Reference numeral 32 denotes an air supply opening opened in the outdoor-installed water heater main body 33, which sucks combustion air from the outside of the water heater main body 33 by the rotation of the blower 17 and supplies it to the blower passage 16.
[0023]
A heat exchanger 34 is located at the upper portion of the combustion chamber 15 and includes a plurality of fins 35 and heat transfer tubes 36 for exchanging heat with the combustion gas rising from the combustion chamber 15, and is a water supply that winds around the outer periphery. The pipe 37 and the hot water supply pipe 38 are connected to a pipe (not shown) outside the water heater main body 33 so as to supply hot water to an appropriate place.
[0024]
39 is an exhaust passage which is generated by combustion in the combustion chamber 15 and exhausts the exhaust gas after heat exchange by the heat exchanger 34 to the outside of the water heater main body 33. One end is in close contact with the upper end of the combustion chamber 15 and Is provided with a discharge port 40 that opens to the outdoors.
[0025]
A recirculation pipe 41 communicates the exhaust passage 39 and the air supply port 32 of the blower 17. A part of the exhaust gas is sucked by the suction force of the blower 17, mixed with the combustion air, and supplied to the combustion chamber 15. This reduces the generation of nitrogen oxides by reburning.
[0026]
Next, a block diagram of an electric circuit according to an embodiment of the present invention will be described. As shown in FIG. 6, reference numeral 42 denotes a control unit having various functions such as comparison, calculation, storage, and timer. The operation switch 43 that does not give a combustion instruction but controls the power supply to the appliance, the flow sensor 44 that detects the flowing water by opening and closing the faucet and gives a combustion instruction, and the reset that releases the stop holding state due to the occurrence of an error A switch 45 is connected.
[0027]
Further, the heater 2 for heating, the blower 17, the ignition means 24, the flow rate pump 27, and the damper 18 are connected to the output side of the control unit 42 through the stepping motor 20, and during the hot water supply operation, The control unit 42 controls the opening degree of the damper 18 together with the rotational speed control of the blower 17 and the fuel supply amount control of the flow rate pump 27 according to the required amount of heat, and the control unit 42 is heated when the operation switch 43 is ON. When the heater 2 is energized and the flow sensor 44 detects flowing water, the reset signal is output to the damper 18 to drive the stepping motor 20 to the closed side with a predetermined drive pulse, and to the blower 17 and the flow pump 27. An ignition operation is performed in which the ignition means 24 is operated after the operation.
[0028]
Next, the operation of the embodiment of the present invention will be described with reference to the flowchart shown in FIG.
First, when the operation switch 43 provided on the remote controller of the water heater is turned on (S1), energization of the heater 2 is started (S2), and the fuel oil supplied from the fuel injection nozzle 3 is sufficiently vaporized. When the carburetor 1 reaches (S3), it is checked whether the flow sensor 44 has detected running water due to opening and closing of the faucet (S4). If the flow sensor 44 does not detect, it is determined that hot water supply is not yet required. Then, it is checked whether the operation switch 43 is turned off. (S5)
[0029]
If the operation switch 43 remains ON in (S5), the energization control of the heater 2 is performed so that the vaporizer 1 maintains a predetermined temperature so that the hot water supply operation can be started immediately at any time (S6). Returning to (S4), and if the operation switch 43 has been turned OFF in (S5), it is determined that hot water supply is not required for a while, and energization of the heater 2 is stopped. , (S1).
[0030]
In (S4), when the flow sensor 44 detects flowing water due to opening and closing of the faucet, a predetermined number of drive pulses are output to the stepping motor 20 that drives the damper 18 so that the damper 18 closes the air passage 16. (S8) When the output drive pulse reaches a specified number (S9), it is determined that the damper 18 has finished moving to a predetermined position for closing the air passage 16 as shown in FIG. 2 (S10). Next, the blower 17 and the flow rate pump 27 are driven (S11), and the ignition means 24 composed of an igniter is operated. (S12)
[0031]
Therefore, when the ignition detection unit 23 detects ignition (S13), normal hot water supply operation control is performed as shown in FIG. 1 (S14), and when the ignition detection unit 23 does not detect ignition in (S13), First, the blower 17 and the flow pump 27 are determined to be in an unignited state (S15), and then it is checked whether the ignition means 24 has been operated once (S16), and the ignition means 24 has been activated. When it is determined that the reignition operation is to be performed once, the flow returns to (S11), the blower 17 and the flow pump 27 are driven again, and the ignition means 24 including an igniter is operated. (S12)
[0032]
In the re-ignition operation, it is assumed that the damper 18 has moved to a predetermined position for closing the air passage 16 as shown in FIG. 2, but did not ignite for some reason. The ignition means 24 is operated after the blower 17 and the flow rate pump 27 are restarted.
[0033]
When the second ignition operation, that is, the re-ignition operation is performed, when the ignition detection unit 23 does not detect the ignition (S13), it is determined that the ignition has not been performed, and the blower 17 and the flow pump 27 are stopped. (S15) Next, it is checked whether the ignition means 24 is operated once (S16). When the ignition means 24 is not operated once, it is checked whether the ignition means 24 is operated twice. (S17) If it is determined that the ignition means 24 has been operated twice, it is determined that the reignition operation will be performed again, and the process returns to (S8) and the damper 18 is driven by the stepping motor 20 so that the air passage 16 is closed. When a specified number of pulses are output and the output drive pulse reaches the specified number (S9), it is determined that the damper 18 has finished moving to a predetermined position where the air passage 16 is closed as shown in FIG. (S10), then blower 17 and flow rate And driving the pump 27 (S11), and is intended to operate the ignition means 24 of the igniter. (S12)
[0034]
This is because in the re-ignition operation, the damper 18 is caused by something, for example, the wind enters from the discharge port 40 due to a strong wind and temporarily becomes a strong reverse wind, or the stepping motor 20 is temporarily out of step. Thus, unlike the conventional reignition operation, it is assumed that the damper 18 did not ignite well because the damper 18 has not moved to the predetermined position for closing the air passage 16 as shown in FIG. First, a specified number of drive pulses are output to the stepping motor 20 that drives the damper 18 so that the damper 18 closes the air passage 16 (S8), and the output drive pulse reaches the specified number. At the time (S9), it is determined that the damper 18 has finished moving to a predetermined position for closing the air passage 16 (S10), then the blower 17 and the flow pump 27 are driven (S11), and the ignition It is intended to operate the ignition means 24 comprising a. (S12)
[0035]
When the ignition detection unit 23 does not detect ignition even after performing the third ignition operation, that is, the re-ignition operation (S13), it is determined that the ignition has not been performed, and the blower 17 and the flow pump 27 are stopped. (S15) Next, it is checked whether the ignition means 24 is operated once (S16). When the ignition means 24 is not operated once, it is checked whether the ignition means 24 is operated twice. (S17) If the ignition means 24 has been operated three times, it is determined that an ignition error has occurred, the engine is completely stopped due to the occurrence of an abnormality (S18), and an error in the ignition error is displayed on the display unit (not shown). Display. (S19)
[0036]
When the damper 18 outputs a specified number of drive pulses to the stepping motor 20 in the re-ignition operation so that the air passage 16 is closed, the damper 18 is ignited before the output drive pulse reaches the specified number. Even when the predetermined position in time is reached, when the remaining drive pulse is input to the stepping motor 20, the drive shaft 19 to which the lower end of the damper 18 is fixed slips, so that the stepping motor 20 does not fail thereby. It is.
[0037]
In this way, in the reignition operation in the case where the first ignition operation is not ignited, the ignition means 24 is operated after the blower 17 and the flow rate pump 27 are operated again. Therefore, the damper 18 is ignited in the first ignition operation. If it is not ignited even if it is in the predetermined position at the time, it will be ignited by a quick re-ignition operation, so the time from when hot water supply is required by opening and closing the faucet etc. until the hot water supply operation starts Is something that can be done.
[0038]
When the re-ignition operation is not ignited, the re-ignition operation is driven so that the damper 18 first closes the air passage 16 to the stepping motor 20 that drives the damper 18 as in the first ignition operation. Since the ignition means 24 is operated after the blower 17 and the flow pump 27 are restarted after outputting the specified number of pulses, the damper 18 is operated in the first ignition operation and the second ignition operation. If it is not ignited because it has not moved to the predetermined position for closing the air passage 16 for some reason, the ignition operation is performed to restart the damper 18 so that it is ignited. It is possible to prevent the occurrence of an ignition error, reduce the inspection / repair of specialists due to the occurrence of an unignition error, and improve the usability.
[0039]
In addition, if the ignition unit 24 is operated again after the damper 18, the blower 17, and the flow rate pump 27 are reactivated, the controller 42 determines that an ignition error has occurred when the ignition is not repeated. By displaying the error of the ignition error on the display unit by making the entire stop state due to the occurrence of an abnormality, it is not the occurrence of an unignition error due to the position of the damper 18 but an unignition due to other causes. In addition, it is possible to prevent the user from repeatedly igniting in that state and damaging the combustion device or operating in an abnormal state. Therefore, it is understood that the non-ignition error is not caused by the occurrence of the non-ignition error, so that the cause of the non-ignition error can be quickly identified and the inspection / repair time can be shortened.
[0040]
In addition, although the present Example demonstrated in the example which applied the combustion apparatus to the water heater, it is not limited to this, You may apply a combustion apparatus to a heater or an air conditioner.
[0041]
【The invention's effect】
As described above, according to the combustion apparatus of the first aspect, the blower for supplying the combustion air, the flow rate pump for supplying the fuel oil to the fuel injection nozzle, and the fuel oil supplied from the fuel injection nozzle are vaporized and vaporized. A carburetor for premixing fuel oil and combustion air from the blower, a blower passage for guiding the combustion air from the blower to the vaporizer, and a damper in the blower passage for varying the cross-sectional area of the blower passage A combustion section for burning the premixed gas premixed in the carburetor, ignition means for igniting the premixed gas in the combustion section, and ignition detection for detecting the premixed gas ignited in the combustion section A combustion apparatus that performs an ignition operation of generating a premixed gas by operating a blower and a flow rate pump and igniting the same by an ignition means after moving the damper to a closed position. The ignition detection unit detects ignition. If not, the re-ignition operation in which the blower and the flow pump are re-activated and ignited by the ignition means, and when the re-ignition operation does not detect the ignition, the damper is moved to the closed position. After that, the re-ignition operation is performed by activating the blower and the flow pump and igniting by the igniting means, so that the re-ignition operation when the first ignition operation is not ignited is reactivated. After that, if the ignition means is activated, and the damper is not ignited even in the initial ignition operation even if it is in the predetermined position during the ignition operation, it can be ignited by performing a quick re-ignition operation, thus driving The time from the start operation to the start of operation can be shortened.
[0042]
In addition, the re-ignition operation when the re-ignition operation is not yet performed is the same as the first ignition operation. First, the stepping motor that drives the damper is set to the specified number of drive pulses so that the damper closes the air passage. After the output, the blower and the flow pump are restarted and then the ignition means is operated. As a result, the first ignition operation and the second ignition operation are the re-ignition operation. If it is not ignited because it has not moved to the predetermined position to close the road, it will be ignited by performing an ignition operation that restarts the damper, so it is possible to prevent the occurrence of an unignition error due to a defective damper position, It is possible to reduce the inspection and repair of specialists due to errors and improve usability.
[0043]
According to the combustion apparatus of claim 2, in the combustion apparatus of claim 1, when the re-ignition operation does not detect ignition, it is determined that an unignition error has occurred, and In addition, since a control unit that outputs an error display signal and a display unit that displays an error by an error display signal output from the control unit, it is not merely an occurrence of an unignition error due to a defective position of the damper. Although it is not ignited due to the cause, it is possible to prevent the user from repeatedly igniting in that state and damaging the combustion device or operating in an abnormal state. , Because the repair person knows that it is not just an unignited error due to a bad position of the damper, the cause of the unignited error can be identified quickly, and the inspection and repair time can be shortened. That.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a water heater to which a combustion apparatus according to an embodiment of the present invention is applied.
FIG. 2 is a configuration diagram of a water heater showing an ignition operation when the damper position of the combustion apparatus is normal.
FIG. 3 is a configuration diagram of a water heater showing an ignition operation when the damper position of the combustion apparatus is poor.
FIG. 4 is a cross-sectional view of a main part of the combustion apparatus.
FIG. 5 is a schematic view showing a damper of the combustion apparatus.
FIG. 6 is a block diagram of the electric circuit.
FIG. 7 is a flowchart at the same ignition operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vaporizer Exhaust pipe 3 Fuel injection nozzle 11 Combustion part 16 Blower path 17 Blower 18 Damper 23 Ignition detection part 24 Ignition means 27 Flow rate pump

Claims (2)

A blower that supplies combustion air, a flow rate pump that supplies fuel oil to the fuel injection nozzle, and vaporization that vaporizes the fuel oil supplied from the fuel injection nozzle and premixes the vaporized fuel oil and combustion air from the blower A blower that guides combustion air from the blower to the vaporizer, a damper in the blower passage that varies the cross-sectional area of the blower, and a premixed gas premixed in the vaporizer A combustion section for burning, ignition means for igniting the premixed gas in the combustion section, and an ignition detection section for detecting that the premixed gas is ignited in the combustion section, and after the damper is moved to the closed position In a combustion apparatus that performs an ignition operation by operating a blower and a flow pump to generate a premixed gas and igniting it with an ignition means, when the ignition detection unit does not detect ignition in the ignition operation, the blower And reflow the flow pump Re-ignition operation that is ignited by the ignition means, and when the re-ignition operation does not detect the ignition, the damper is moved to the closed position, and then the blower and the flow pump are operated. A combustion apparatus characterized by performing a re-ignition operation that is ignited by an ignition means. When the ignition detection unit does not detect ignition in the re-ignition operation, it is determined that an unignition error has occurred, and the control unit outputs an error display signal and outputs the error display signal. The combustion apparatus according to claim 1, further comprising a display unit that displays an error by an error display signal.

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