JPH11337057A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce residual gas and hence suppress odor by controlling after burning combustion after shutdown in response to an output of a flame rod. SOLUTION: There are provided a fuel tank 2, a fuel pump 4, a vaporization section 6 for vaporizing a fuel, a nozzle for injecting vaporized gas, a solenoid 15 for closing a nozzle hole with a needle valve upon power supply while opening the same upon power supply interruption, a burner portion 17 for combusting vaporized gas, a burner portion 17 for combusting vaporized gas, a flame rod 24 provided in the vicinity of the burner portion 17, fuel detection means 25 for detecting a combustion state from set values provided into a plurality of stages, an air fan 21 for sucking indoor air and supplying part of the sucked indoor air to the burner portion 17, and a control portion 23 for controlling operation conditions to control combustion. The control section 23 controls an off point of the air fan 21 and an operation point of the solenoid 15 in response to a flame rod output from the combustion detection means 25 after interruption of the pump 4 upon shutdown.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for vaporizing a liquid fuel and ejecting the vaporized gas from a nozzle for combustion.

[0002]

2. Description of the Related Art In a conventional hot air heater of this type, as shown in FIGS. 5 and 6, fuel in a tank 35 is supplied by a pump 36 to a vaporizing section 37 maintained at a predetermined temperature or higher during combustion. The supplied fuel is supplied to the vaporizing chamber 3 in the vaporizing section 37.
The gas is vaporized by a vaporizing element 39 provided in 8 and becomes a vaporized gas, and has a high pressure in a vaporizing chamber 38, is ejected from a nozzle 40, is supplied to a burner 41, and is burned there. The generated combustion exhaust gas is guided upward by a combustion tube 42 disposed so as to cover the periphery of the burner portion 41, mixed with a room air flow from a blower 44 by a duct 43 covering the combustion tube 42, and And is used for heating.

A nozzle 40 for ejecting fuel vaporized gas in a vaporization chamber 38 is opened and closed by a needle valve 46 connected to a movable portion of an electromagnetic solenoid 45. When operation is stopped, the electromagnetic solenoid 45 is energized for a predetermined time, and a needle The nozzle 40 is closed by the valve 46 so that the fuel gas from the nozzle 40 is not injected and the combustion is stopped. Thereafter, the nozzle 40 is opened. The blower 44 is also stopped almost simultaneously with the opening of the nozzle 40, so that the burner 41
And the temperature of the main body is designed to be cooled.

[0004]

However, in the warm air heater having such a conventional structure, the energizing time of the electromagnetic solenoid 45 is limited by the temperature rise of the coil, so that the energizing time cannot be too long. In addition, the post-fan operation performed after the combustion is stopped is also performed in a state where the number of rotations is reduced and the amount of air is reduced in order to reduce the blowing sound of the blower 44 due to a feeling of use or the like. For this reason, the closing time of the nozzle 40 after the operation is stopped and the cooling time by the blower 44 are shortened, and the needle valve 46 of the electromagnetic solenoid 45 opens the nozzle 40 and the blower 44 before the temperature of the vaporizing section 37 becomes sufficiently low. It is in a state of stopping.

When the power of the electromagnetic solenoid 45 is stopped in a state where the temperature of the vaporizing section 37 is high after the end of the post fan, and the needle valve 46 of the movable section opens the nozzle 40, the residual liquid remaining in the vaporizing chamber 38 is accumulated. The vaporized gas of the fuel leaks from the nozzle 40 and becomes tar and adheres around the vaporizing portion 37 or generates an odor, giving the user discomfort.

This is likely to occur when the amount of combustion immediately before the extinguishing is large, particularly when the heat capacity of the vaporizing portion is large, or when the amount of heat of the blower 44 is reduced due to the adhesion of dust and the like, and the heat is likely to be trapped. . If the time from the stoppage of operation to the stoppage of energization of the electromagnetic solenoid 45 and the blower 44 is lengthened to prevent this, the temperature of the coil of the electromagnetic solenoid 45 may increase, and the electromagnetic solenoid 45 itself may be damaged. When the air volume of the blower 44 at that time is increased, the feeling of cool air and the sound of the air blow are increased, and the feeling of use is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. Unburned gas is burned for a predetermined period after a fire extinguishing operation, the residual gas is extremely reduced, and the nozzle hole is closed. It is an object of the present invention to prevent leakage of fuel gas remaining in the section 37, prevent tarring and odor generation around the vaporizing section when the operation is stopped, and allow a user to use the apparatus comfortably for a long time. Things.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tank for storing fuel, a pump for sucking and discharging fuel from the tank, and a vaporizing section for vaporizing fuel supplied by the pump. A heater for heating the vaporizing section, a temperature detecting means for detecting the temperature of the vaporizing section, a nozzle for ejecting the vaporized gas, and a needle valve for closing the nozzle hole when energized and opening when the energization is stopped. An electromagnetic solenoid, a burner section for burning the vaporized gas, combustion detecting means for detecting a combustion state from a signal of a frame rod provided near the burner section and a set value provided in a plurality of stages, and a combustion gas generated in the burner section. Cylinder, which guides the air upward, a duct that covers the combustion cylinder, mixes the combustion gas with the indoor air flow from the blower to generate hot air, and operates a pump and an electromagnetic solenoid. And a control unit which controls the conditions for controlling the combustion, wherein the control unit so as to control after pump stop during extinguishing operation, the extinguishing control unit according to the frame rod output from said combustion detection means.

According to the above invention, the combustion state continued by the residual gas after the fire extinguishing operation is detected by the flame rod and the combustion detecting means, and the OFF point of the blower which is the deodorizing control means and the electromagnetic solenoid are detected in accordance with the output. The operating point is determined, the fuel gas is completely shut off after the residual gas has been burned to some extent, and then a predetermined cooling operation is performed, so that a large amount of unburned Gas can be minimized to prevent tarification and odor generation of fuel around the vaporization section, and appropriate energization time to the electromagnetic solenoid can be suppressed to suppress the temperature rise of the electromagnetic solenoid coil. The user can use it comfortably for a long time.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A combustion apparatus according to a first aspect of the present invention includes a tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizing section for vaporizing fuel supplied by the pump, and a vaporizing section. A heater for heating the temperature of the vaporizing section, a nozzle for ejecting vaporized gas, an electromagnetic solenoid that operates a needle valve that closes a nozzle hole when energized and opens when electric power is stopped,
A burner section for burning the vaporized gas, a signal from a frame rod provided in the vicinity of the burner section, combustion detection means for detecting a combustion state from a set value provided in a plurality of stages, and a combustion gas generated in the burner section upward. A guiding cylinder, a duct that covers the combustion cylinder, mixes the combustion gas with the indoor air flow from the blower and generates hot air, and a control unit that controls operating conditions such as the pump and the electromagnetic solenoid to control combustion. And the control unit controls the deodorizing control unit in accordance with the flame rod output from the combustion detecting unit after the pump is stopped during the fire extinguishing operation.

Then, the combustion state continued by the residual gas after the fire extinguishing operation is detected by the flame rod and the combustion detecting means, and the OF of the blower which is the deodorizing control means is operated in accordance with the output.
The point F and the operating point of the electromagnetic solenoid are determined, the fuel gas is cut off in a state where the residual gas has been burned to some extent, and then a predetermined cooling operation is performed, so that a large number of nozzles generated immediately after the fire extinguishing operation are performed. Minimizing unburned gas from the engine, preventing tarification and odor generation of fuel around the vaporization section, and securing an appropriate energizing time for the electromagnetic solenoid to suppress the temperature rise of the electromagnetic solenoid coil. It can be used comfortably by the user for a long time.

In the combustion apparatus according to the second aspect, at least the blower and the electromagnetic solenoid are operated in a predetermined sequence after the fire extinguishing operation as the deodorizing control means.

In the combustion apparatus according to the third aspect, a first set value for determining an OFF point of the blower after the fire extinguishing operation is provided to the combustion detecting means, and the combustion state after the fire is extinguished is provided below the first set value. A second set value to be detected and a third set value provided below the second set value to determine the ON point of the electromagnetic solenoid are provided.

Further, the combustion apparatus according to the fourth aspect of the present invention has a timer means for starting the operation when the flame rod output after the fire extinguishing operation becomes equal to or less than the first set value. When the frame rod output falls below the second set value, the electromagnetic solenoid is operated at the time when the output falls below the second set value or at the end of the set time of the timer means to close the nozzle hole with the needle valve, and within the set time of the timer means. If the flame rod output does not fall below the second set value, the comparison value with the frame rod output is changed to the third set value at the end of the set time of the timer means.

The second, third and fourth aspects of the present invention detect a post-combustion state continued after the fire extinguishing operation, respectively, by a plurality of set values set by the flame rod and the combustion detecting means, and control the odor according to the result. By determining the operating points of the blower and the electromagnetic solenoid, which are the means, and securing the optimal deodorizing sequence, the unburned gas from the large number of nozzles generated immediately after the fire extinguishing operation is minimized, It prevents tarring and odor generation of the surrounding fuel, and secures the appropriate energizing time of the electromagnetic solenoid to suppress the temperature rise of the coil of the electromagnetic solenoid, so that users can use it comfortably for a long time. It is.

In the combustion apparatus of the present invention, the operation of the blower and the electromagnetic solenoid after the fire is extinguished is controlled in accordance with the flame rod output from the combustion detecting means only when the amount of combustion immediately before the fire is extinguished is the maximum. I have.

The blower and the electromagnetic solenoid are controlled in accordance with the output of the flame rod only when the fire is extinguished at the maximum combustion amount, where the amount of the combustion gas leaked from the nozzle immediately after the fire extinguishing operation is the largest. It prevents tarning and odor generation around the part, and allows the user to use it comfortably for a long time.

Further, in the combustion apparatus according to the present invention, when the timer means for starting operation when the flame rod output after the fire extinguishing operation becomes equal to or less than the first set value is timed up, the flame rod output is set to the second set value. When the value falls below, the notification unit notifies the user.

If the flame rod output falls below the second set value within the time set by the timer setting means 26 in the post-combustion state after the fire extinguishing operation, normal operation is performed due to an abnormal vaporization state or the like. The combustion state is also in a deteriorating tendency, and in such a state, the notification unit 27 is notified via the control unit 23 to prompt early maintenance and ensure safety. In addition, it allows the user to use it comfortably for a long time.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1A is a control block diagram of a hot air heater using Embodiment 1 of the present invention, and FIG.
FIG. 2 is a sectional view of a main part of the hot air heater. FIG. 1 (a) (b)
In the figure, reference numeral 1 denotes a main body case, on which a tank 2 holding liquid fuel is provided on a lower side thereof, and a detachable cartridge tank 3 is provided above the tank 2. Reference numeral 4 denotes a pump mounted on the upper surface of the tank 2, which supplies fuel from the upper end thereof to the vaporizing section 6 via an oil feed pipe 5.

FIG. 2 is a sectional view of a main part of a combustion section of a hot air heater using the first embodiment of the present invention. In FIG. 2, a vaporizing element 8 for promoting vaporization of fuel is provided in a vaporizing chamber 7 for vaporizing supplied fuel, and a mixing pipe 9 projects from the center of the vaporizing section 6 to mix the fuel. An annular donut is formed so as to surround the pipe 9, and a heater 10 and a vaporizing section temperature detecting means 11 are disposed on a peripheral wall thereof. Reference numeral 12 denotes a communication passage provided to the nozzle unit 13 on the side opposite to the mixing pipe 9 with respect to the inlet of the oil feed pipe 5 of the vaporization unit 6.

A return pipe 14 connected to the tank 2 and an electromagnetic solenoid 15 are connected to the nozzle 13, and the electromagnetic solenoid 15 is connected to the nozzle 13 of the nozzle 13.
A needle valve 16 for opening and closing A is provided. 17 is
A burner mounted on the upper part of the vaporizer 6 so as to cover the outlet of the mixing pipe 9. In the vicinity, a high-pressure discharge or the like for starting combustion into a vaporized gas ejected from a flame hole 18 formed in a peripheral wall of the burner 17 is provided. An ignition means 19 is provided. 20 is the burner unit 1
A combustion tube that guides the combustion exhaust gas from above upward, and a blower 21 that takes in and sends out the indoor air flow is disposed behind the combustion tube. Reference numeral 22 denotes a duct that mixes the combustion exhaust gas from the combustion tube 20 with the indoor air flow to generate hot air.

Reference numeral 23 denotes a pump 4 based on a signal of an operating condition such as a control temperature input from an operation unit (not shown) or a signal of a sensor such as a vaporization unit temperature detecting means 11 provided in the apparatus. The control unit controls the operation of a device that starts and stops combustion by controlling the heater 10, the electromagnetic solenoid 15, the blower 21, and the like in a predetermined sequence. Reference numeral 24 denotes a flame rod for detecting a flame current flowing through a flame formed in a flame hole 18 provided on a peripheral wall of the burner portion 17, and 25 denotes a combustion for detecting a combustion state by comparing with a signal from the frame rod 24. The detection means includes a setting means for setting a plurality of set values for detecting a combustion state continued by the residual gas after the fire extinguishing operation, and a combustion confirmation unit 25a for comparing each set value with a signal of the frame rod 24. Make up. Reference numeral 25b denotes first setting means for setting a first set value for determining an OFF point of the blower 21 after the fire extinguishing operation. Reference numeral 25c sets a second set value for checking the state of combustion by the residual gas after the fire extinguishing operation by the second setting means. 25d sets a third set value for determining the operating point of the electromagnetic solenoid 15 according to the result of comparison with the second set value. Reference numeral 26 denotes a timer means which starts operation when the signal of the frame rod 24 decreases to a first set value set by the first setting means 25b, and after a predetermined time, a combustion confirmation unit 25a and a second setting means. 25
A signal is sent to c, and the combustion state after the fire extinguishing operation is confirmed by comparing the signal of the flame rod 24 with the second set value. Reference numeral 27 denotes a notification unit for notifying the combustion state by the residual gas after the fire extinguishing operation via the control unit 23.

In the above configuration, the vaporizing section 6 includes the heater 10
Is heated to a predetermined temperature, and the oil entering from the inlet of the oil feed pipe 5 is vaporized by the vaporizing element 8 of the vaporizing chamber 7. The vaporized gas flows downward through the communication passage 12 below the vaporization section 6 and reaches the nozzle section 13. When the electromagnetic solenoid 15 is operated to open the needle valve 16, the vaporized gas is ejected from the nozzle section 13. The vaporized gas is supplied into the burner section 17 through the mixing pipe 9 while sucking and mixing the surrounding air,
It comes out from the flame hole 18 part. Here, when the ignition operation is performed by the ignition means 19, a uniform flame is formed in the large number of flame holes 18 to start the combustion, and the flame rod 24 and the combustion detection means 25 perform the ignition detection.
Is stopped, the fuel continues to be supplied to the vaporizing section 6 by the pump 4 to continue the combustion.

The generated combustion exhaust gas is guided upward by a combustion cylinder 20 disposed so as to cover the periphery of the burner section 17, and mixed with a room air flow from a blower 21 by a duct 22 covering the combustion cylinder 20. It is discharged as warm air and used for heating. When the control unit 23 adjusts the fuel supply amount by changing the drive frequency and applied voltage of the pump 4 based on an operation condition signal input from the operation unit, the primary air amount also decreases. The amount of combustion can be changed while the ratio of fuel and air is kept constant.

FIG. 3 is a flowchart showing a sequence at the time of stopping the combustion of the warm air heater using the first embodiment of the present invention. Then, when the combustion stop is input from the operation unit, the pump 4 is stopped to start the fire extinguishing operation as shown in the flowchart of FIG.
Since the open state is continued, the residual gas
And the flame form gradually decreases, but combustion continues. This combustion state is detected from the flame rod 24, and the first set value set by the first setting means 25b provided in the combustion detection means 25 is compared with the combustion confirmation section 25a. When the relation of one set value is reached, the power supply to the blower 21 is stopped, and the supply of combustion air to the burner unit 17 is gradually reduced to stabilize afterburning combustion. At the same time, the operation of the timer means 26 is started, and the flame rod output detected by the flame rod 24 within the time set by the timer means 26 is set by the second setting means 25c provided in the combustion detecting means 25. If the flame rod output falls below the second set value within a predetermined time, it is determined that the after-burning state is poor, and the flame rod output is determined. At a time point when the temperature becomes lower than the second set value, the electromagnetic solenoid 15 is energized to close the nozzle hole 13A of the nozzle portion 13 to block the ejection of the residual gas, and to perform a predetermined post fan operation to perform the post-fire extinguishing operation. Odor generation due to residual gas is suppressed.

In the above embodiment, the electromagnetic solenoid 15
Is performed when the output of the frame rod falls below the second set value. The same applies to the case where the power supply to the electromagnetic solenoid 15 is started after the time set by the timer means 26 has elapsed. An effect can be obtained.

If the flame rod output does not decrease to the second set value within the time set by the timer means 26, it is determined that the post-burn combustion is continuing normally, and the comparison value of the flame rod output is changed to the second value. The third setting value is changed to the third setting value set by the third setting means 25d, and the after-burning combustion is continued until the flame rod output decreases to the third setting value, thereby reducing the residual gas as much as possible. When the output of the frame rod decreases to the third set value, the electromagnetic solenoid 15 is energized to close the nozzle hole 13A of the nozzle portion 13 to shut off the ejection of the residual gas and extinguish the fire by performing a predetermined post fan operation. Odor generation due to residual gas after the operation is suppressed.

FIG. 4 shows the relationship between the flame rod output after the fire extinguishing operation and each set value, the blower 21 and the electromagnetic solenoid 15.
FIG. 9 is a diagram showing the operation state of the air conditioner. As described with reference to the flowchart, the blower 21 and the electromagnetic solenoid 15 are controlled in accordance with the flame rod output after the fire extinguishing operation so that the afterburning by the residual gas is optimally performed. This is to explain what was done.

Further, when the post-burning combustion state after the fire extinguishing operation is such that the flame rod output falls below the second set value within the time set by the timer setting means 26, the normal combustion due to an abnormal vaporization state or the like. The state is also in a deteriorating tendency, and if such a state occurs, the notification unit 27 notifies the control unit 23 of the state.

[0032]

As described above, according to the combustion apparatus of the first aspect, the combustion state continued by the residual gas after the fire extinguishing operation is detected by the flame rod and the combustion detecting means, and the deodorizing control is performed according to the output. Determine the OFF point of the blower, which is the means, and the operating point of the electromagnetic solenoid, perform a fuel gas shut-off operation in a state where the residual gas has been burned to some extent, and then perform a predetermined cooling operation, immediately after the fire extinguishing operation. Minimize the amount of unburned gas generated from the large number of nozzles, prevent tarring and odor generation of fuel around the vaporization section, and secure the appropriate energizing time of the electromagnetic solenoid to maintain the temperature of the coil of the electromagnetic solenoid. The rise can be suppressed, and the user can use it comfortably for a long period of time.

According to the combustion apparatus of the second, third, and fourth aspects, the afterburning combustion state continued after the fire extinguishing operation is detected by a plurality of set values set by the flame rod and the combustion detecting means, and the result is obtained. The operating points of the blower and the electromagnetic solenoid, which are the deodorizing control means, are determined accordingly, and an optimal deodorizing sequence is ensured to minimize unburned gas from a large number of nozzles generated immediately after the fire extinguishing operation. ,
In addition to preventing the fuel around the vaporization section from tarring and generating odor, the appropriate energizing time of the electromagnetic solenoid is ensured to suppress the rise in the temperature of the electromagnetic solenoid coil, allowing users to use it comfortably for a long period of time. You can do it.

According to the combustion apparatus of the fifth aspect, the leakage amount of the combustion gas from the nozzle immediately after the fire extinguishing operation is the largest.
Only when the fire is extinguished at the maximum combustion amount, the blower and the electromagnetic solenoid are controlled according to the output of the frame rod, preventing the formation of tar and odor around the vaporizing section when the operation is stopped,
The user can use it comfortably for a long time.

According to the combustion apparatus of the sixth aspect, in a post-burning combustion state after the fire extinguishing operation, when the flame rod output falls below the second set value within the time set by the timer setting means. The normal combustion state is also deteriorating due to abnormalities in the vaporization state, etc.If such a state occurs, the notification unit notifies the control unit via the notification unit, and early maintenance is performed. It encourages and secures safety and allows the user to use it comfortably for a long time.

[Brief description of the drawings]

FIG. 1A is a control block diagram of a combustion device according to a first embodiment of the present invention. FIG.

FIG. 2 is a sectional view of a main part of a combustion section of the apparatus.

FIG. 3 is a flowchart when the combustion is stopped in the apparatus.

FIG. 4 is a diagram showing a relationship between a flame rod output and a set value when combustion of the device is stopped, and a relationship between a blower and an electromagnetic solenoid.

FIG. 5 is a sectional view of a main part of a conventional combustion device.

FIG. 6 is a sectional view of a main part of a combustion section of a conventional combustion device.

[Explanation of symbols]

 2 Tank 4 Pump 6 Vaporizer 10 Heater 11 Temperature Detector 13 Nozzle 13A Nozzle Hole 15 Electromagnetic Solenoid 16 Needle Valve 17 Burner 21 Blower 23 Controller 24 Frame Rod 25 Combustion Detector 25a Combustion Confirmer 25b First Setting Means 25c First 2 setting means 25d Third setting means

Claims (6)

[Claims] 1. A tank for storing fuel, a pump for sucking and discharging fuel from the tank, a vaporizer for vaporizing the fuel supplied by the pump, a heater for heating the vaporizer, and a heater for the vaporizer. Temperature detecting means for detecting a temperature, a nozzle for ejecting a vaporized gas, an electromagnetic solenoid for operating a needle valve for closing a nozzle hole when energized and opening when the energization is stopped, a burner section for burning the vaporized gas, and the burner Combustion detection means for detecting a combustion state from a signal of a frame rod provided in the vicinity of the section and a set value provided in a plurality of stages, a blower for sucking room air and supplying a part of the air to the burner section, the pump and the electromagnetic A control unit for controlling combustion by controlling operating conditions of a solenoid or the like, wherein the control unit stops the pump during the fire extinguishing operation, and then controls the flame lock from the combustion detection means. OF of the blower in accordance with an output
A combustion device for controlling a point F, an operating point of an electromagnetic solenoid (hereinafter referred to as deodorizing control means). 2. The combustion apparatus according to claim 1, wherein the fire extinguishing control means operates at least the blower and the electromagnetic solenoid in a predetermined sequence after the fire extinguishing operation. 3. The combustion detecting means according to claim 1, further comprising:
A first set value for determining the FF point, a second set value provided below the first set value for detecting a combustion state after extinguishing, and an electromagnetic solenoid provided further below the second set value. And a third set value for determining an ON point of the first control signal.
A combustion device as described. 4. The control section has timer means for starting operation when the flame rod output after the fire extinguishing operation becomes equal to or less than a first set value, and the flame rod output is reduced within a set time of the timer means. 2 When the value falls below the set value, at the time when the value falls below the value or when the set time of the timer means ends, the electromagnetic solenoid is operated to close the nozzle hole with the needle valve,
2. The method according to claim 1, wherein when the frame rod output does not fall below the second set value within the set time of the timer means, the comparison value with the frame rod output is changed to the third set value at the end of the set time of the timer means. A combustion device as described. 5. The control unit controls the operation of the blower and the electromagnetic solenoid after the fire is extinguished according to the flame rod output from the combustion detection means only when the amount of combustion immediately before the fire is extinguished is the maximum. The combustion device according to any one of claims 4 to 10. 6. The control unit according to claim 1, wherein when the flame rod output after the fire extinguishing operation becomes equal to or less than the first set value, when the timer means for starting operation is timed up, the flame rod output falls below the second set value. The combustion device according to any one of claims 1 to 4, wherein the notification is performed by a notification unit.