JP2951017B2 - Exhaust system of combustor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device for a combustor such as a petroleum hot water heater or a petroleum hot water boiler.

[0002]

2. Description of the Related Art Conventionally, as an exhaust device for a combustor of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 52122/1984, an outer cylinder having an exhaust port on a peripheral wall and a closed upper end is disclosed. A concentric inner cylinder into which exhaust gas flows from below is provided, and an opening through which the exhaust gas flows out is provided in a peripheral wall of an upper portion of the inner cylinder.

In the above-described conventional apparatus, the exhaust gas flows into the inner cylinder from below, flows into the space between the inner cylinder and the outer cylinder through the upper opening, and is exhausted from the exhaust port to the outside.

[0004]

By the way, in the exhaust system described above, since the exhaust gas flows out from the upper part of the inner cylinder in a concentrated manner, the exhaust gas cannot not only be sufficiently dispersed but discharged but also exhausted. At the time of ignition of a burner in which the internal pressure of the passage rapidly rises, it is difficult to smoothly release the increase in the internal pressure from the opening in the upper portion of the inner cylinder, and thus it is impossible to suppress the combustion noise at the time of ignition.

The present invention has been made in view of the above circumstances, and has as its object to reduce the generation of noise while increasing the diffusivity of exhaust gas to be exhausted.

[0006]

According to the present invention, there is provided an outer cylinder having an exhaust portion on a peripheral wall and having an upper end closed, and provided substantially concentrically in the outer cylinder so as to face the exhaust portion, and to reduce exhaust gas. And an inner cylinder flowing from the inner cylinder, the inner cylinder has a number of openings in the peripheral wall, and
In this configuration, the lower opening is formed larger than the upper opening.

Further, according to the present invention, there is provided an outer cylinder having an exhaust portion on a peripheral wall and having a closed upper end, and provided substantially concentrically in the outer cylinder so as to face the exhaust portion so that exhaust gas flows from below. The inner cylinder has a large number of openings in the peripheral wall, and the lower opening ratio is set to be larger than the upper opening ratio.

Further, according to the present invention, in the exhaust device for a combustor according to claim 1 or 2, a plurality of guide plates for guiding exhaust gas flowing out of the opening to the exhaust port of the outer cylinder are provided on the outer periphery of the inner cylinder. This is a configuration provided with an interval therebetween.

Further, according to the present invention, in the exhaust device for a combustor according to claim 1 or 2, the outer cylinder below the inner cylinder includes:
This is a configuration in which a soundproof material having an exhaust passage formed inside is accommodated.

[0010]

With this configuration, the exhaust gas flowing into the inner cylinder from below does not flow out from the upper part of the inner cylinder in a concentrated manner, but is dispersed and flows out from the lower part and the upper part of the inner cylinder. Therefore, exhaust gas that has been sufficiently diffused is discharged from the exhaust portion. Moreover, since the lower opening of the inner cylinder is formed to be larger than the upper opening, or the lower opening ratio is set to be larger than the upper opening ratio, the exhaust gas flowing out of the inner cylinder of the exhaust gas can be further reduced. In addition to being able to disperse, when the burner is ignited, the increase in the internal pressure can be smoothly released from the opening of the inner cylinder, and the combustion noise at the time of ignition can be suppressed while enhancing the diffusibility of the exhaust gas.

Further, in the exhaust device according to the third aspect, the exhaust gas flowing out of the opening of the inner cylinder can be guided to the exhaust portion without being concentrated on a part, and rainwater entering from the exhaust portion enters the inner cylinder. Can be suppressed.

Further, in the exhaust device of the fourth aspect,
With the soundproofing material, it is possible to suppress the combustion noise from leaking to the outside, and also to suppress the rise in the temperature at the lower part of the outer cylinder, so that it is possible to promote noise reduction and enhance safety.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a small petroleum water heater will be described below with reference to FIGS. FIG. 4 is a partially cutaway side view of a small oil hot water heater according to one embodiment. In FIG. 4, reference numeral 1 denotes an outer case including a substrate 2, a peripheral side plate 3, and a top plate 4. Is a can body 5 and a muffler 6 connected to the top of the can body 5
And a burner 7 composed of a gun type burner.

The can body 5 is composed of an inner body 9, an outer body 10, an upper plate 11, a bottom plate 12, and a plurality of smoke tubes 13, 13 and the like having a combustion chamber 8 formed inside. And outer trunk 1
Between 0 and above the inner body 9 is a water chamber 15 to which tap water is supplied from a water supply pipe 14, and the hot water in the water chamber 15 is supplied to a utilization section via a tapping pipe 16. .

The burner 7 is an electromagnetic pump (not shown)
The liquid fuel pressurized by the blower is ejected to the lower part of the combustion chamber 8 in a divergent manner, and the combustion air from the blower 17 is ejected from around the ejected fuel to ignite and burn with the spark of a spark plug (not shown). Things. Reference numeral 18 denotes a refractory heat insulating material installed at the inner bottom of the combustion chamber 8, and 19 denotes an outer case 1.
Sound absorbing heat insulating material such as glass wool attached to the inner surface of
Reference numeral 0 denotes a water amount adjusting valve provided in the water supply pipe 14.

Then, the high-temperature exhaust gas burned in the combustion chamber 8 passes through a smoke tube 13 as shown in FIG. 4 and exchanges heat with water in a water chamber 15, and then passes through the silencer 6 for exhaust connection. It is discharged from the pipe 21 to the outside of the outer case 1. Also, since the exhaust device 22 is fitted to the exhaust connection pipe 21,
The exhaust gas is exhausted from the exhaust device 22 into the atmosphere.

FIGS. 1 to 3 show the exhaust device 22. Next, the exhaust device 22 will be described in detail. The exhaust device 22 includes a number of horizontally elongated exhaust ports 23,
A cylindrical outer cylinder 26 having a staggered exhaust portion 24 and an upper end closed by a canopy 25;
An inner cylinder 27 is provided substantially concentrically in the outer cylinder 26 so as to face the exhaust portion 24, and the exhaust gas flows in from below, and is housed in the outer cylinder 26 below the inner cylinder 27. At the substantially central portion, a cylindrical sound insulating material 29 having a good sound absorbing property and having a ceramic fiber as a main component and having an exhaust passage 28 formed therein.

The outer cylinder 26 is formed with an inwardly directed annular bead 30 at a substantially central portion of the peripheral wall. The annular bead 30 is provided with a desired number of drainage holes 31 and 31 and the annular bead 30 is abutted against the annular bead 30. A donut-shaped support plate 32 is horizontally fixed at an intermediate height position in the outer cylinder 24, and a lower end of the inner cylinder 27 is fitted and supported on an annular rising portion 32A substantially at the center of the support plate 32. ing.

Reference numeral 33 denotes a donut-shaped bottom cover attached to the lower end of the outer cylinder 26. An exhaust port 34 is provided at a substantially central portion of the bottom cover 33, and a bottom surface of the bottom cover 33 on the outer periphery of the exhaust port 34 is provided. Is fixed to a fitting cylinder 35 fitted to the exhaust connection pipe 21 discharged onto the top plate 4 of the outer case 1.

As shown in FIGS. 1 and 3, the inner cylinder 27 has a large number of openings 36, 36, 3 substantially over its entire peripheral wall.
7, 37, 38, and 38 are provided side by side and in a plurality of stages (three stages in the embodiment) in the vertical direction.
The size (opening area) of 6, 36
37 and the upper openings 38, 38. In other words, the openings 36,
The sizes of 37 and 38 are sequentially reduced.

The outer periphery of the inner cylinder 27 has an opening 3
The exhaust gas flowing out of the exhaust section 24
A plurality of annular guide plates 39, 39 for guiding the guide plates 39, 39 are mounted at intervals in the vertical direction.
Has its lower surface aligned with the upper edge of the opening 36, 37, 38 of each step.

Reference numeral 40 denotes a diaphragm plate fitted and mounted on the upper end of the inner cylinder 27.
An aperture 41 having a diameter smaller than the aperture diameter is provided, and the aperture plate 40 and the guide plate 39 at the upper position are formed by integral molding.

In the above-described configuration, the combustion exhaust gas flowing into the exhaust device 22 from the exhaust inlet 34 passes through the exhaust passage 28 inside the soundproof material 29, and after absorbing noise such as combustion vibration noise, It flows into the inner cylinder 27 from below. The exhaust gas that has flowed into the inner cylinder 27 has openings 36, 37,
It flows out from the aperture 38 and the aperture 41 of the aperture plate 40 and is dispersed. The exhaust gas flowing out of the openings 36, 37, 38 flows in the horizontal direction along the lower surfaces of the guide plates 39, 39, and is exhausted from the exhaust ports 23, 23 of the exhaust unit 24 to the outside.

According to this embodiment, the exhaust gas flowing into the inner cylinder 27 is supplied to each of the large number of openings 36, 37, 38 provided on substantially the entire peripheral wall of the inner cylinder 27 and the throttle port 41 on the upper part of the inner cylinder 27. From the inner cylinder 27 and the outer cylinder 26 to prevent the exhaust gas from flowing out from the upper part of the inner cylinder 27 as in the prior art. It flows out in a dispersed state, and therefore, each exhaust port 2 of the exhaust part 24
Exhaust gas that has been sufficiently diffused is exhausted to the outside from 3, 23, and it is possible to prevent a part of the outer cylinder 26 from being locally overheated, thereby improving durability.

The size of the openings 36, 37, and 38 is made smaller in order from the lower part to the upper part of the inner cylinder 27, so that the ventilation resistance of the opening 38 at the upper part of the inner cylinder 27 through which the exhaust gas can flow easily is reduced. Since the ventilation resistance of the lower opening 36 is smaller, the exhaust gas flows out substantially uniformly throughout the inner cylinder 27. Therefore, at the time of ignition of the burner 7 in which the internal pressure of the exhaust path rises sharply, the internal pressure rise
Can escape smoothly and substantially evenly from the openings 36, 37, 38 and the throttle port 41, and can reduce the generation of combustion noise when the burner is ignited.
Therefore, it is possible to reduce the noise while significantly increasing the diffusivity of the exhaust gas.

Further, a plurality of guide plates 39, 39 are mounted on the outer surface of the peripheral wall of the inner cylinder 27 at intervals from each other, so that the exhaust gas flowing out of the openings 36, 37, 38 is dispersed. The exhaust gas is guided to the exhaust portion 24 of the outer cylinder 36, so that the diffusibility of the exhaust gas can be further enhanced. In addition, since the guide plates 39, 39 function as umbrellas, rainwater passes through the exhaust portion 24 to Even if the rainwater enters the cylinder 26, the rainwater can be prevented from entering the inner cylinder 27 by the guide plates 39, 39, and the rainwater can reliably be prevented from entering the exhaust passage 28.

Furthermore, the outer cylinder 26 below the inner cylinder 27
Inside, a cylindrical soundproof material 29 having an exhaust passage 28 formed therein is accommodated, so that the exhaust gas is
When passing through, a part of the combustion noise is absorbed and shielded by the soundproofing material 29, so that the leakage of the combustion noise can be suppressed, and the heat insulation of the soundproofing material 29 can reduce the temperature rise at the lower part of the outer cylinder. Safety can be improved while reducing noise.

Further, in the above-described embodiment, since the diaphragm plate 40 and the guide plate 39 are formed as one-piece molded products, the number of parts can be reduced. Further, an inward bead 30 is provided at an intermediate height position of the outer cylinder 26, and the bead 30 is provided with a support plate 3.
Since the peripheral edge of the support plate 2 is abutted, the support plate 32 can be easily positioned, and the workability of mounting the support plate such as welding can be improved. Drainage of rainwater that has entered the outer cylinder 26 can be reliably performed. Also, the drain hole 31 is inserted into the bead 30.
If a large number are provided over the entire circumference, the outside air can be introduced through the drain hole 31, and the temperature of the exhaust unit 24 can be reduced by the introduction of the outside air.

In the above-described embodiment, the sizes of the openings 36, 37 and 38 formed in the peripheral wall of the inner cylinder 27 are sequentially reduced from the lower part to the upper part of the inner cylinder 27.
The size of the openings 36, 37, 38 is constant, and the inner cylinder 27
May be set to be larger than the upper opening ratio. Of course, in this case, it is necessary to sequentially set the aperture ratio smaller from the lower part to the upper part of the inner cylinder 27.
This is the best way.

[0030]

Since the present invention is constructed as described above, the exhaust system according to claim 1 or 2 prevents exhaust gas from flowing out of the upper part of the inner cylinder and concentrates on the lower part of the inner cylinder. And can be dispersed and drained from the top,
When the burner is ignited, a rise in the internal pressure of the exhaust path can be smoothly released from the inner cylinder, so that noise reduction can be achieved while increasing the diffusivity of the exhaust gas.

In the exhaust device according to the third aspect, the exhaust gas flowing out of the inner cylinder can be guided to the exhaust portion without being partially concentrated, and the rainwater entering from the exhaust portion enters the inner cylinder. Can be suppressed.

Further, in the exhaust device of the fourth aspect,
The soundproofing material can suppress the combustion noise from leaking to the outside, can also suppress the rise in the temperature of the outer cylinder, and can further improve the safety while further reducing the noise.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an exhaust device according to an embodiment of the present invention.

FIG. 2 is a plan view of an essential part of the same.

FIG. 3 is a side view of the main part.

FIG. 4 is a partially cutaway side view of the small petroleum water heater with the exhaust device of the combustor according to the present invention attached.

[Explanation of symbols]

 Reference Signs List 22 exhaust device 24 exhaust unit 26 outer cylinder 27 inner cylinder 28 exhaust passage 29 soundproof material 36 opening 37 opening 38 opening 39 guide plate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Monma 2-18-18 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23L 17/00-17/04

Claims (4)

(57) [Claims] 1. An outer cylinder having an exhaust portion on a peripheral wall and having a closed upper end, and an inner cylinder provided substantially concentrically in the outer cylinder so as to face the exhaust portion and through which exhaust gas flows from below. An exhaust device for a combustor, comprising: an inner cylinder having a large number of openings in a peripheral wall, and a lower opening formed to be larger than an upper opening. 2. An outer cylinder having an exhaust portion on a peripheral wall and having a closed upper end, and an inner cylinder provided substantially concentrically in the outer cylinder so as to face the exhaust portion and through which exhaust gas flows from below. An exhaust device for a combustor, comprising: an inner cylinder having a large number of openings in a peripheral wall, and a lower opening ratio is set to be larger than an upper opening ratio. 3. A plurality of guide plates for guiding exhaust gas flowing out of an opening to an exhaust port of an outer cylinder are provided on an outer periphery of the inner cylinder at intervals from each other. Item 1
Or the exhaust device of the combustor according to 2. 4. The exhaust device for a combustor according to claim 1, wherein a soundproof material having an exhaust passage formed inside is accommodated in an outer cylinder below the inner cylinder.