JP3355845B2 - Combustion equipment - Google Patents

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 injecting and burning fuel gas.

[0002]

2. Description of the Related Art Generally, as this type of combustion apparatus, there is an apparatus which burns a liquid fuel gas obtained by vaporizing gas or kerosene. Hereinafter, a combustion device for burning the liquid fuel gas will be described 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 fuel gas is vaporized by the vaporizer 30 and becomes a fuel gas.
Spouted more horizontally. The fuel ejected from the nozzle 31 is ejected into a mixing pipe 32 provided at a position downstream of the vaporizer 30 while sucking the primary air by an ejector effect, and is mixed with the primary air. It is supplied to an integral line-shaped burner section 33 and is burned there. The generated combustion gas is guided upward by a combustion tube 34 disposed so as to cover the periphery of the burner section 33, mixed with a room air flow from a blower 36 by a duct 35 covering the combustion tube 34, and heated. It is discharged as wind and used for heating. When the fuel supply amount is adjusted by changing the driving frequency or applied voltage of the pump 29, the primary air amount increases or decreases accordingly, and the combustion amount is changed while the fuel-to-air ratio is kept constant. Is available.

[0004]

However, in the combustion device having such a structure, the fuel injected from the nozzle 31 sucks the primary air by the ejector effect and separates the mixing pipe 32 provided on the downstream side of the vaporizer 30. In particular, the noise of the fuel injected from the nozzle 31 at that time, the noise of the mixed gas flowing from the nozzle 31 into the mixing pipe 32, and the mixing noise in the mixing pipe 32, 3
There is a problem that a collision sound is generated between the fuel ejected from No. 1 and the primary air sucked by the ejector effect, and a large and unpleasant shoe noise is generated in a high frequency range of 2000 Hz or more.

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

[0006]

In order to achieve the above object, the present invention provides a nozzle for ejecting fuel gas, and suctions primary air downstream of the nozzle by an ejector effect of the fuel gas ejected from the nozzle. And a burner tube for burning the mixed gas supplied from the mixing tube. The first invention provides a fuel gas jetted from the nozzle. A ring-shaped rectifying tube is provided around the vicinity of the nozzle so as to rectify 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 tube so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle, and a plurality of pores are formed around the opening. The configuration is such that a rectifying plate is provided.

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

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

[0010]

According to the first aspect of the present invention, there is provided:
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 Another primary air flow is drawn by the ejector effect caused by the flow, and the collision between the fuel flow and the primary air flow can be reduced.

According to the second aspect of the present invention, the rectifying action of the rectifying plate having an opening near the nozzle and having a plurality of pores formed around the nozzle produces a collision sound between the flow of the fuel gas and the flow of the primary air, and the mixing from the nozzle. Sound of mixed gas flowing into the pipe,
In addition, it is possible to reduce a mixed sound in the mixing tube.

Further, in the third aspect, in addition to the rectifying action of the opening having a flange provided near the nozzle and the rectifying plate having a plurality of pores formed around the opening, the sound insulating effect of the flange acts to mix from the nozzle. The noise of the mixed gas flowing into the pipe and the mixed noise in the mixing pipe can be further reduced.

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

[0014] The ring diameter of the flow straightening tube or the flange diameter of the flow straightening plate of the first, second, and third configurations is set to be at least about 1.1 times the diameter of the narrow portion of the inlet of the mixing pipe, so that the shoe is formed. Although the noise reduction effect is slightly reduced, the resistance of the flow straightening tube and the current straightening plate is reduced, and the amount of primary air sucked by the ejector effect of the fuel gas can be increased.

[0015]

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

First, the configuration of a warm air warmer using the combustion apparatus of the present invention will be described with reference to FIG.
A tank 2 for holding the 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. The pump 4 extends from an upper end of the pump to supply fuel to the combustion device 6.

Reference numeral 7 denotes a combustion tube for guiding the combustion gas from the combustion device 6 upward, and a blower 8 for taking in and sending out the indoor air flow is disposed behind the combustion tube. Reference numeral 9 denotes a duct which mixes the combustion gas from the combustion tube 7 with the indoor air flow to generate hot air. 1
A control unit 0 controls the combustion of the combustion device 6 and the blower 8, and controls the pump 4 and the blower 8 in a predetermined sequence based on an operation 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 denotes a substantially ring-shaped burner receiving seat, and 12 denotes 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 fuel gas. Reference numeral 13 denotes a vaporizing element provided in the vaporizer 12 for improving the vaporization efficiency of the fuel.
A heater 14 keeps the vaporizer 12 at a predetermined temperature.
2 is controlled by an output from the control unit 10 based on an input from a temperature detecting means 15 such as a thermistor for detecting the temperature. Reference numeral 16 denotes a nozzle integrally attached to the end of the vaporizer 12 for jetting fuel gas from the vaporizer 12.

Reference numeral 17 denotes a ring-shaped rectifying pipe provided around the nozzle 16 for rectifying 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 mounted on the burner receiving seat 11 so as to be located above the nozzle 16, and is formed in an upward tapered shape having a slightly larger upper portion.
The mixing tube 18 has an inlet portion 18A formed in a throat shape, and is opposed to the nozzle 16.
The fuel gas ejected from the fuel gas and the primary air sucked by the ejector effect of the ejection of the fuel gas are mixed. Reference numeral 19 denotes a canned cylindrical burner tube which is overlaid and covered on the burner receiving seat 11 from the upper opening 18B side so as to cover the mixing tube 18, and has a mold having at least its upper peripheral wall along the peripheral wall of the mixing tube 18. To form a mixing tube section 20, and the lower peripheral wall forms a plurality of vertically elongated flame holes 21 to form a combustion section 22. Reference numeral 23 denotes an upwardly tapered burner ring attached to the burner receiving seat 11 so as to surround the outer peripheral portion of the flame hole 21, and reference numeral 24 denotes a heat receiving portion formed integrally with the burner receiving seat 11.

In the above configuration, the cartridge tank 3
The liquid fuel supplied to the tank 2 so as to maintain a constant oil level from the tank 2 is sucked up from the tank 2 by the pump 4 and sent to the vaporizer 12 of the combustion device 6 via the oil supply pipe 5. The sent fuel is vaporized in the vaporizer 12 maintained at a predetermined temperature or higher by the heater 14 and becomes a high-pressure fuel gas, and is ejected from the nozzle 16. At this time, the primary air is sucked by the ejector effect while the primary vapor is sucked. The mixture is mixed in the mixing pipe 18 provided on the downstream side, supplied to the burner cylinder 19, ejected from the flame hole 21 of the combustion section 22, and burned. Then, the generated combustion gas flows to above 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 to be used 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 conditions set by the operation unit to start and stop the operation, change the combustion amount, and the like. Perform operation control.

Here, the combustion in the burner cylinder 19 will be described in detail. The fuel gas ejected from the nozzle 16 is:
While sucking primary air by the ejector effect, the primary air flows into the mixing pipe 18 provided on the downstream side of the vaporizer 12 and is mixed therein, and is mixed therefrom through the upper opening 18B of the mixing pipe 18.
The mixture is discharged into the pipe 9 and flows around the outer circumference of the mixing pipe 18, and is ejected from a large number of flame holes 21 provided in a combustion section 22 below the burner cylinder 19 and burns.

At this time, since the diameter of the combustion section 22 is larger than that of the mixing pipe section 20, diffusion and mixing of the mixed gas and uniformization of pressure are promoted in this section, and the mixed gas is uniformly ejected from the flame hole 21 to be uniform. Forms a flaming flame. The flame formation direction is controlled so that the flame is directed upward by the burner ring 23 provided on the outer periphery thereof, and stable combustion without lift is performed. In addition, heat receiving section 2
4 is heated by the flame formed in the combustion portion 22 of the burner cylinder 19, and the vaporizer 12 is heated by the heat recovery action from the flame.
Is maintained at a certain temperature or higher, and it is possible to reduce a part or all of the current supply to the heater 14.

The suction of the primary air by the ejection of the fuel gas will be described. When the vaporized fuel gas is ejected from the nozzle 16, this becomes a driving flow, and the air around the driving gas is generated around by the ejection of the driving flow. The primary flow is mixed with the driving air and the primary air by being dragged by the negative pressure and the viscosity of the driving flow from the throat inlet 18A (curved portion of the inlet) of the mixing pipe 18, and the cylindrical portion of the mixing pipe 18 (diffuser). The pressure is increased at (part), and is discharged into the burner cylinder 19 from 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 generated in the vicinity of the fuel are formed by the ring-shaped rectifying pipe disposed around the nozzle 16. And the primary air flow is rectified into another primary air flow sucked by the ejector effect caused by the primary air flow, so that the primary air flow is mixed with the fuel gas flow in a stepwise manner. In other words, the primary air is gradually mixed with the high-speed flow of the fuel gas, the collision between the flow of the fuel gas and the primary air is reduced, and the noise of a large and unpleasant shoe in a high frequency range of 2000 Hz or more is prevented. You.

FIG. 3 shows another embodiment. The same parts as those described in the previous embodiment are denoted by the same reference numerals and the description thereof will be omitted. Only the different parts will be described. A plate-shaped or perforated plate-like straightening plate sandwiched and held between the mixing tube 11 and the mixing tube 18 is arranged so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle 16. An opening 25a near the nozzle 16 is formed in the pipe inlet 18A and a plurality of pores 2 are formed around the opening 25a.
5b are formed.

In the above-described configuration, the rectifying plate 25 having the opening 25a near the nozzle 16 and a plurality of pores 25b formed therearound exhibits the same rectifying action as described above, and the flow of the fuel gas and the flow of the primary air flow. The impact sound, the sound of the mixed gas flowing from the nozzle 16 into the mixing pipe 18, and the mixing pipe 1
Thus, it is possible to reduce the mixed noise in the inside 8 and also to prevent the noise of a large and uncomfortable shoe in a high frequency range of 2000 Hz or more.

FIG. 4 shows another embodiment. The same parts as those described in the previous embodiment are denoted by the same reference numerals and the description thereof will be omitted. Only the different parts will be described. 25 is a cylindrical flange formed on the periphery of the opening 25a.

In the above configuration, the flange portion 26 of the rectifying plate 25 provided in the vicinity of the nozzle 16 exhibits a sound insulating effect, and reduces the collision between the flow of the fuel gas and the flow of the primary air by a synergistic effect with the rectifying operation. Can be done,
The noise of the mixed gas flowing into the mixing pipe 18 from the nozzle 16 and the mixing noise in the mixing pipe 18 can be reduced.
It is possible to further prevent the noise of a large and uncomfortable shoe in a high frequency range of 2000 Hz or more.

Further, according to an experiment, as shown in FIG. 5, the height of the ring 17 of the above-described flow straightening tube or the height of the flange 26 of the flow straightening plate 25 in the first and third configurations is adjusted.
1/5 to 1/2 of the narrow diameter of 8A, preferably about 1/3
By doing so, it is possible to effectively reduce noise caused by collision of the flow of the fuel gas with the flow of the primary air, and to increase the amount of primary air sucked by the ejector effect of the fuel gas.

According to an experiment, as shown in FIG. 6, the ring diameter of the above-described rectifying tube 17 or the opening diameter near the nozzle of the rectifying plate 25 having the first, second, and third configurations is reduced by the narrowing of the inlet 18A of the mixing tube. By making the diameter approximately 1.1 times or more, the noise reduction effect of the shoe is slightly reduced, but the resistance of the flow straightening tube and the flow straightening plate is reduced, and the amount of primary air sucked by the ejector effect of the fuel gas is reduced. Will be able to increase.

In the above embodiment, the description has been given of the combustion apparatus of the type in which the liquid fuel is gasified. However, this may be a combustion apparatus of directly burning the gas, or a combustion apparatus of a vertical burner configuration. As described above, this may be a combustion device having a horizontally long line-shaped burner configuration. Furthermore, the rectifier tube is single, but the number may be plural, and the configuration of each part may be any configuration as long as the object of the present invention is achieved.

[0033]

As described above, in the combustion apparatus of the present invention, a ring-shaped rectifying pipe is provided around the vicinity of the nozzle so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. With this configuration, the flow of the fuel gas ejected from the nozzle, the flow of the primary air sucked by the ejector effect generated near the fuel gas, and the flow of the primary air sucked by the ejector effect generated by the flow of the primary air The flow is rectified into one primary air flow, and the collision between the fuel flow and the primary air flow can be reduced.

In addition, a rectifying plate having an opening near the nozzle at the inlet of the mixing tube and having a plurality of pores formed therearound is provided at the inlet of the mixing tube so as to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. The same rectifying action as described above is also exerted, and the sound of the collision between the flow of the fuel gas and the flow of the primary air, the sound of the mixed gas flowing from the nozzle into the mixing pipe, and the Mixed sounds can be reduced.

Further, in the configuration in which a flange portion is provided in an opening portion near the nozzle of the current plate, in addition to the rectifying action of the current plate, a sound insulating effect by the flange portion acts to mix the nozzle into the mixing pipe. The sound of gas inflow and the sound of mixing in the mixing pipe can be further reduced.

Further, in the first and third embodiments, the height of the ring of the straightening tube or the height of the flange of the straightening plate is set to ５〜 to の of the diameter of the narrow portion of the inlet of the mixing tube.
The collision between the flow of the fuel gas and the flow of the primary air can be effectively reduced, and the amount of primary air sucked by the ejector effect of the fuel gas can be increased while reducing noise.

In the first, second, and third configurations, the ring diameter of the flow straightening tube or the flange diameter of the flow straightening plate, which is about 1.1 times or more the diameter of the narrow portion at the entrance of the mixing tube, is a straightening type. The resistance of the pipe and the flow straightening plate can be reduced, and the amount of primary air sucked by the ejector effect of the fuel gas can be increased.

As described above, according to the present invention, any of the above-described embodiments can reduce the collision between the flow of the fuel gas and the flow of the primary air with a simple structure, and can exhibit the sound insulation effect. Can reduce the noise of the mixed gas flowing into the mixing pipe from the nozzle and the mixing noise in the mixing pipe, and can reduce the noise of a large and uncomfortable shoe in a high frequency range of 2000 Hz or more.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part of a hot air heater using the combustion device.

FIG. 3 is a sectional view of a combustion apparatus 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 Nozzle 17 Straightening pipe 18 Mixing pipe 19 Burner cylinder 25 Straightening plate 26 Flange

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 11/02 F23D 11/40-11/44 F23D 14/02 F23D 14/62-14/64

Claims (5)

(57) [Claims] 1. A bottomless cylindrical mixer in which a nozzle for ejecting a fuel gas and an inlet for sucking primary air by an ejector effect of the fuel gas ejected from the nozzle face each other downstream of the nozzle. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe, and a ring-shaped flow rectifier near the nozzle to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. A combustion device provided with a tube. 2. A bottomless cylindrical mixing device comprising: a nozzle for ejecting fuel gas; and an inlet for sucking primary air by an ejector effect of the fuel gas ejected from the nozzle facing the nozzle. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe, and the vicinity of the nozzle near the inlet of the mixing pipe to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. A combustion device provided with a straightening plate having an opening and a plurality of pores formed around the opening. 3. A bottomless cylindrical mixer in which a nozzle for ejecting fuel gas and an inlet for sucking primary air by an ejector effect of the fuel gas ejected from the nozzle face each other downstream of the nozzle. A pipe and a burner cylinder for burning the mixed gas supplied from the mixing pipe, and the vicinity of the nozzle near the inlet of the mixing pipe to rectify the primary air sucked by the ejector effect of the fuel gas ejected from the nozzle. A combustion device comprising: a straightening plate having an opening and a plurality of pores formed around the opening; and a flange portion provided in an opening of the straightening plate near a nozzle. 4. The height of the ring of the straightening tube or the height of the flange of the straightening plate is set to 1/5 to 1 of the diameter of the narrow portion at the entrance of the mixing tube.
4. The combustion device according to claim 1, wherein the ratio is / 2. 5. The method according to claim 1, wherein the ring diameter of the flow straightening tube or the flange diameter of the flow straightening plate is at least about 1.1 times the diameter of the narrow portion of the inlet of the mixing pipe.
Item 3. The combustion device according to item 1.