JPH08200620A - Burner - Google Patents

Abstract

PURPOSE: To reduce the noise generated at the time of injecting fuel with a simple structure in a burner for injecting and burning fuel gas. CONSTITUTION: This burner comprises a nozzle 16 for injecting fuel gas, an open-end cylindrical mixing tube 18 oppositely disposed at the inlet at the downstream side of the nozzle 16, a burner cylinder 19 for burning the mixed gas supplied from the tube 18, and a ringlike straightening tube 17 or a flat platelike straightening plate is provided at the near periphery of the nozzle 16. With the structure, the tube 17 or the plate straightens the primary air sucked by the ejector effect of the fuel gas injected from the nozzle 16 to mix the primary air stepwisely with the high speed flow of the fuel gas, and the harsh hissing noise due to the collision of the fuel gas with the flow of the primary air can be reduced with the simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device for injecting and burning fuel gas.

[0002]

2. Description of the Related Art Generally, as this type of combustion device, there is one that burns liquid fuel gas obtained by vaporizing gas or kerosene. The combustion device for burning the liquid fuel gas will be described below as an example. Such a combustion device is configured as shown in FIG.

That is, first, fuel is supplied to the tank 27 from the cartridge tank 28, and the fuel in the tank 27 is supplied to the carburetor 30 by the pump 29. Then, the vaporizer 30 vaporizes the fuel gas, and the nozzle 31
It is ejected more horizontally. The fuel ejected from the nozzle 31 is ejected into the mixing pipe 32 provided separately on the downstream side of the carburetor 30 while sucking the primary air by the ejector effect, and is mixed with the primary air there to mix with the mixing pipe 32. It is supplied to the integrated line-shaped burner portion 33 and burned there. The generated combustion gas is guided upward by the combustion cylinder 34 arranged so as to cover the periphery of the burner portion 33, mixed with the indoor air flow from the blower 36 by the duct 35 covering the combustion cylinder 34, and heated. It is discharged as wind and used for heating. When the fuel supply amount is adjusted by changing the driving frequency of the pump 29 or the applied voltage, this combustion device also changes the primary air amount accordingly, and changes the combustion amount while keeping the fuel-air ratio constant. You can do it.

[0004]

However, in the combustion device having such a structure, the fuel jetted from the nozzle 31 sucks the primary air by the ejector effect and separates the mixing pipe 32 downstream of the carburetor 30. Since it is jetted into the inside, the jetting noise of the fuel jetted from the nozzle 31 at that time, the noise of the mixed gas flowing into the mixing pipe 32 from the nozzle 31, and the mixing noise in the mixing pipe 32, especially the nozzle Three
There is a problem that a collision sound between the fuel ejected from No. 1 and the primary air sucked by the ejector effect is generated, and a loud noise such as a shoe is generated in a high frequency region of 2000 Hz or higher.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to reduce the jarring sound of the shoe with a simple structure.

[0006]

In order to achieve the above object, the present invention sucks primary air by a nozzle for ejecting fuel gas and an ejector effect of the fuel gas ejected from the nozzle on the downstream side of the nozzle. In the first aspect of the present invention, there is provided a bottomless cylindrical mixing pipe having the inlet portions thereof facing each other, and a burner cylinder for burning the mixed gas supplied from the mixing pipe. A ring-shaped straightening tube is provided around the vicinity of the nozzle so as to straighten the primary air sucked by the ejector effect.

In the second invention, the vicinity of the nozzle is opened at the inlet of the mixing pipe and a plurality of pores are formed around the inlet of the mixing pipe so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. The rectifying plate is provided.

Furthermore, in the third aspect of the invention, the vicinity of the nozzle is opened at the inlet of the mixing pipe and a plurality of pores are formed around the inlet of the mixing pipe so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. Is provided, and a flange portion is provided in an opening portion near the nozzle of the current plate.

Further, the ring height of the rectifying pipe or the flange height of the rectifying plate of the first and third configurations is set to 1/5 to 1/2 of the narrow portion diameter of the mixing pipe inlet, or The ring diameter of the rectifying tube or the flange diameter of the rectifying plate of the first, second, and third configurations is set to about 1.1 times or more the diameter of the narrow portion at the inlet of the mixing tube.

[0010]

According to the first aspect of the present invention, the present invention has the following features.
By the ring-shaped straightening pipe arranged around the vicinity of the nozzle, the flow of the fuel gas ejected from the nozzle, the flow of the primary air sucked by the ejector effect generated in the vicinity of the fuel gas, and the primary air The ejector effect caused by the flow creates another primary air flow that is sucked in, thus reducing the collision between the fuel flow and the primary air flow.

Further, in the second aspect of the invention, the flow noise of the flow of the fuel gas and the flow of the primary air and the mixing from the nozzle are produced by the flow rectifying action of the flow rectifying plate which opens in the vicinity of the nozzle and has a plurality of pores around the nozzle. Sound of inflow of mixed gas into the pipe,
Then, it becomes possible to reduce the mixed sound in the mixing pipe.

Further, according to the third aspect of the invention, in addition to the rectifying action of the opening having the flange portion provided in the vicinity of the nozzle and the rectifying plate having a plurality of pores around the opening, the flange portion acts as a sound-insulating effect to mix from the nozzle. It becomes possible to further reduce the inflow noise of the mixed gas into the pipe and the mixing noise in the mixing pipe.

Further, by making the ring height of the straightening pipe or the height of the flange of the straightening plate of the first and third constructions 1/5 to 1/2 of the narrow portion diameter of the mixing pipe inlet, The collision of the flow of fuel gas and the flow of primary air can be effectively reduced, and the amount of primary air sucked by the ejector effect of fuel gas can be increased while reducing noise.

Further, by setting the ring diameter of the rectifying tube or the flange diameter of the rectifying plate of the first, second and third configurations to be about 1.1 times or more the diameter of the narrow portion at the inlet of the mixing tube, the shoe is provided. Although the noise reduction effect is slightly reduced, the resistance of the straightening pipe and the straightening plate can be reduced to increase the amount of primary air sucked by the ejector effect of the fuel gas.

[0015]

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

First, referring to FIG. 2, the structure of a warm air warmer using the combustion apparatus of the present invention will be described.
A tank 2 holding a liquid fuel and a detachable cartridge tank 3 are arranged above the tank 2 on the lower side thereof. Reference numeral 4 denotes a pump mounted on the upper surface of the tank 2, and an oil feed pipe 5 is led out from the upper end of the pump to supply fuel to the combustion device 6.

Reference numeral 7 denotes a combustion cylinder for guiding the combustion gas from the combustion device 6 upward, and a blower 8 for taking in and delivering the indoor air flow is arranged at the back of the combustion cylinder. Reference numeral 9 is a duct for mixing the combustion gas from the combustion cylinder 7 and the indoor air flow to generate warm air. 1
Reference numeral 0 is a control unit for controlling the combustion of the combustion device 6 and the blower 8. The control unit 0 controls the pump 4, the blower 8 and the like in a predetermined sequence based on the operating condition signal input from the operation unit. .

Next, the structure of the combustion device 6 will be described with reference to FIG. 1. Reference numeral 11 is a substantially ring-shaped burner receiving seat, and 12 is a carburetor integrally formed on the burner receiving seat 11 toward the center thereof. The fuel from the pump 4 is supplied, and the fuel is vaporized into a fuel gas. Reference numeral 13 is a vaporization element provided in the vaporizer 12 for increasing the vaporization efficiency of fuel.
A heater 14 keeps the vaporizer 12 at a predetermined temperature.
The temperature is controlled by the output from the control unit 10 based on the input from the temperature detecting means 15 such as a thermistor that detects the temperature of 2. Reference numeral 16 denotes a nozzle integrally attached to the end portion of the vaporizer 12, which ejects fuel gas from the vaporizer 12.

Reference numeral 17 is a ring-shaped straightening pipe provided around the vicinity of the nozzle 16 and straightens the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle 16.

Reference numeral 18 denotes a bottomless cylindrical mixing tube which is placed on the burner receiving seat 11 so as to be located above the nozzle 16 and is formed in an upwardly tapered shape with its upper portion slightly larger in diameter.
The mixing pipe 18 has an inlet portion 18A formed in a throat shape and faces the nozzle 16, and the nozzle 16
The fuel gas ejected from the air and the primary air sucked by the ejector effect due to the ejection of the fuel gas are mixed. Reference numeral 19 denotes a burner cylinder having a heavenly cylindrical shape which is overlapped and covered with the burner receiving seat 11 from the side of the upper opening 18B so as to cover the mixing tube 18, and a mold in which at least an upper peripheral wall thereof is along the peripheral wall of the mixing tube 18. And the lower peripheral wall is formed with a large number of vertically long flame holes 21 to form a combustion section 22. Reference numeral 23 is an upwardly tapered burner ring attached to the burner receiving seat 11 so as to surround the outer periphery of the flame hole 21, and 24 is a heat receiving portion integrally formed with the burner receiving seat 11.

In the above structure, the cartridge tank 3
The liquid fuel supplied from the tank 2 to the tank 2 so as to maintain a constant oil level is sucked up from the tank 2 by the pump 4 and sent to the carburetor 12 of the combustion device 6 via the oil feed pipe 5. The sent fuel is vaporized in the vaporizer 12 kept at a predetermined temperature or higher by the heater 14 and becomes high-pressure fuel gas and is ejected from the nozzle 16. At that time, the primary air is sucked by the ejector effect while the vaporizer 12 The mixture is mixed in the mixing pipe 18 provided on the downstream side, is supplied into the burner cylinder 19, and is ejected from the flame holes 21 of the combustion section 22 and burned. Then, the generated combustion gas flows upwardly of the combustion cylinder 7, and the duct 9
Inside, it is mixed with the indoor air flow from the blower 8 and discharged as warm air for heating. Then, the control unit 10 controls the heater 14, the pump 4, the blower 8 and the like in a predetermined sequence based on the condition set by the operation unit to start and stop the operation and change the combustion amount. Control the operation.

Here, the combustion in the burner cylinder 19 will be described in detail. The fuel gas ejected from the nozzle 16 is
While sucking the primary air by the ejector effect, the primary air flows into the mixing tube 18 provided on the downstream side of the vaporizer 12 and is mixed there, and the upper opening 18B of the mixing tube 18 causes the burner cylinder 1 to flow.
The gas is discharged into the inside of the mixing pipe 18 and flows back around the outer periphery of the mixing pipe 18, and is ejected from a large number of flame holes 21 provided in the combustion portion 22 below the burner cylinder 19 and burned.

At this time, since the combustion section 22 has a larger diameter than the mixing tube section 20, the mixed gas is diffused and mixed at this portion and the pressure is made uniform, so that the gas is uniformly ejected from the flame holes 21. Forming a simple flame. The flame forming direction is controlled so that the flame is directed upward by the burner ring 23 provided so as to be located on the outer periphery thereof, and stable combustion without lift is performed. Also, the heat receiving portion 2
4 is heated by the flame formed in the combustion section 22 of the burner cylinder 19, and the carburetor 12 is heated by the heat recovery action from this flame.
It becomes possible to maintain the temperature of above a certain temperature or more, and it is possible to reduce a part or all of the power supply to the heater 14.

The suction of the primary air by the jet of the fuel gas will be described. When the vaporized fuel gas is jetted from the nozzle 16, this becomes a driving flow, and the air around it is generated around the jetting of the driving flow. It is dragged by the negative pressure and the viscosity of the driving flow and enters from the throat inlet part 18A (curved part of the inlet) of the mixing pipe 18, the driving flow and this primary air are mixed, and the straight part of the tubular part of the mixing pipe 18 (diffuser) is mixed. The pressure is increased at the portion) and is discharged into the burner cylinder 19 through the upper opening 18B.

At this time, the flow of the fuel gas ejected from the nozzle 16 and the flow of the primary air sucked by the ejector effect produced in the vicinity of the fuel are caused by the ring-shaped straightening pipe arranged around the nozzle 16. Then, the ejector effect generated by the flow of the primary air rectifies the flow of the other primary air to be sucked, so that the flow of the fuel gas is gradually mixed with the flow of the primary air. In other words, the primary air is gradually mixed with the high-speed flow of the fuel gas, the collision of the flow of the fuel gas and the primary air is reduced, and the noise of the shoe, which is greatly annoying in the high frequency range of 2000 Hz or higher, is prevented. It

FIG. 3 shows another embodiment. The same parts as those described in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. If only different parts are described, 25 is a burner receiving seat. 11 is a flat plate-shaped or perforated plate-shaped straightening plate sandwiched between 11 and the mixing pipe 18, and is arranged so as to straighten the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle 16, An opening 25a is formed in the vicinity of the nozzle 16 at the pipe inlet 18A, and a plurality of pores 2 are formed around the opening 25a.
5b is formed.

In the above structure, the straightening plate 25 having the opening 25a in the vicinity of the nozzle 16 and the plurality of pores 25b formed around the opening 16 exhibits the same straightening action as described above, and the flow of the fuel gas and the flow of the primary air are increased. Collision sound, sound of mixed gas flowing from nozzle 16 into mixing tube 18, and mixing tube 1
It becomes possible to reduce the mixed sound in the box 8, and it is possible to prevent the noise of the shoe, which is greatly annoying in a high frequency range of 2000 Hz or higher.

Further, FIG. 4 shows another embodiment, in which the same parts as those described in the previous embodiment are designated by the same reference numerals and their explanations are omitted, and only different parts will be explained. 25 is a cylindrical flange portion formed on the peripheral portion of the opening 25a of 25.

In the above structure, the flange portion 26 of the straightening plate 25 provided in the vicinity of the nozzle 16 exhibits a sound insulating effect, and the synergistic effect with the straightening action reduces the collision of the flow of fuel gas and the flow of primary air. As well as
It is possible to reduce the inflow sound of the mixed gas from the nozzle 16 into the mixing pipe 18 and the mixing sound in the mixing pipe 18,
It is possible to prevent the noise of the shoe, which is more annoying in the high frequency range of 2000 Hz or more.

Further, according to experiments, as shown in FIG. 5, the height of the ring 17 or the height of the flange 26 of the rectifying plate 25 of the rectifying tubes of the first and third configurations is set to the mixing tube inlet 1
1/5 to 1/2 of the narrow part diameter of 8A, preferably about 1/3
By so doing, it is possible to effectively reduce noise generated due to collision between the flow of fuel gas and the flow of primary air, and at the same time increase the amount of primary air sucked by the ejector effect of fuel gas.

Further, according to the experiment, as shown in FIG. 6, the ring diameter of the rectifying tube 17 of the first, second and third configurations or the opening diameter near the nozzle of the rectifying plate 25 is set to be narrow at the mixing tube inlet 18A. By making the diameter about 1.1 times the part diameter or more, the noise reduction effect of the shoe is slightly reduced, but the resistance of the rectification tube and the rectification plate is reduced, and the primary air amount sucked by the ejector effect of the fuel gas is reduced. To be able to increase.

In the above-mentioned embodiment, the combustion apparatus of the type in which the liquid fuel is gasified has been described, but this may be a combustion apparatus which directly combusts the gas, or a combustion apparatus of a vertically arranged burner structure. However, this may be a combustor having a horizontally long line-shaped burner configuration. Furthermore, although the rectifying tube is single, it may be plural, and other configurations may be any configurations as long as the object of the present invention is achieved.

[0033]

As described above, in the combustion apparatus of the present invention, the ring-shaped straightening pipe is provided around the nozzle so as to straighten the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. Since it is configured, the flow of the fuel gas ejected from the nozzle, the flow of the primary air sucked by the ejector effect generated in the vicinity of the fuel gas, and the flow of the primary air sucked by the ejector effect generated by the flow of the primary air By rectifying the flow of one primary air, it becomes possible to reduce the collision between the flow of fuel and the flow of primary air.

Further, in order to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle, a rectifying plate having an opening near the nozzle and a plurality of pores formed around the nozzle is provided at the inlet of the mixing tube. The same rectifying action as above is exhibited, and the collision noise of the flow of fuel gas and the flow of primary air, the noise of the mixed gas flowing from the nozzle into the mixing pipe, and the noise inside the mixing pipe It becomes possible to reduce mixed sounds.

Further, in the structure in which the flange portion is provided in the opening portion near the nozzle of the straightening plate, in addition to the straightening action of the straightening plate, the sound insulating effect of the flange portion works to mix the fluid from the nozzle into the mixing pipe. It becomes possible to further reduce the inflow sound of gas, the mixed sound in the mixing pipe, and the like.

Further, the ring height of the straightening pipe or the height of the flange of the straightening plate of the above-mentioned first and third configurations is set to 1/5 to 1/2 of the narrow portion diameter of the inlet of the mixing pipe,
The collision of the flow of fuel gas and the flow of primary air can be effectively reduced, and the amount of primary air sucked by the ejector effect of fuel gas can be increased while reducing noise.

If the ring diameter of the straightening pipe or the flange diameter of the straightening plate of the first, second, and third constructions is set to be 1.1 times or more the diameter of the narrow portion at the inlet of the mixing pipe, It is possible to reduce the resistance of the pipe and the straightening vane and increase the amount of primary air sucked by the ejector effect of the fuel gas.

As described above, according to the present invention, any of them can reduce the collision between the flow of the fuel gas and the flow of the primary air with a simple structure and can exert the sound insulation effect. Can reduce the inflow sound of the mixed gas from the nozzle into the mixing tube, the mixing sound in the mixing tube, and the like, and can greatly reduce the noise of a shoe that is annoying in a high frequency range of 2000 Hz or higher.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a warm air heater using the same combustion device.

FIG. 3 is a sectional view of a combustion device according to another embodiment of the present invention.

FIG. 4 is a sectional view of the combustion device.

FIG. 5 is a characteristic diagram of a combustion device according to an embodiment of the present invention.

FIG. 6 is a characteristic diagram of the combustion device.

FIG. 7 is a cross-sectional view of a warm-air heater using a conventional combustion device.

[Explanation of symbols]

 16 nozzles 17 straightening pipe 18 mixing pipe 19 burner cylinder 25 straightening plate 26 flange portion

Claims (5)

[Claims] 1. A bottomless cylindrical mixture in which a nozzle for ejecting fuel gas and an inlet for sucking primary air by the ejector effect of the fuel gas ejected from the nozzle are arranged on the downstream side of the nozzle so as to face each other. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe, and a ring-shaped rectifier near the nozzle so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. Combustion device with a tube. 2. A bottomless cylindrical mixture in which a nozzle for ejecting fuel gas and an inlet portion for sucking primary air by an ejector effect of the fuel gas ejected from the nozzle are arranged on the downstream side of the nozzle so as to face each other. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe are provided, and the vicinity of the nozzle is provided at the inlet of the mixing pipe so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. A combustor which is provided with a straightening vane that is open and has a plurality of pores formed around it. 3. A bottomless cylindrical mixture in which a nozzle for ejecting fuel gas and an inlet portion for sucking primary air by the ejector effect of the fuel gas ejected from the nozzle are arranged on the downstream side of the nozzle so as to face each other. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe are provided, and the vicinity of the nozzle is provided at the inlet of the mixing pipe so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. A combustor in which a straightening vane which is opened and has a plurality of pores formed around the straightening vane is provided, and a flange is provided in an opening near the nozzle of the straightening vane. 4. The ring height of the rectifying tube or the flange height of the rectifying plate is ⅕ to 1 of the narrow portion diameter of the inlet of the mixing tube.
The combustion device according to claim 1, claim 2 or claim 3 which is defined as / 2. 5. The ring diameter of the rectifying pipe or the flange diameter of the rectifying plate is about 1.1 times or more the diameter of the narrow portion at the inlet of the mixing pipe, and the first, second or third aspect.
The combustion device according to the item.