JP2959019B2 - Exhaust system of combustor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an exhaust device of a combustor using gas or kerosene as fuel.

2. Description of the Related Art Conventionally, the exhaust device of this type of combustor is disclosed in
As shown in Japanese Unexamined Patent Publication No. 213716, the configuration was as shown in FIGS.

As shown in the figure, an exhaust top 3 communicating the exhaust pipe 2 inside the main body case 1 and the main body case 1 is provided on the downstream side of the exhaust pipe 2, and the exhaust top 3 is provided with an exhaust top front part 4 and an exhaust top rear part. The exhaust top front part 4 has an exhaust outlet 6 having one end open to the outside of the main body case 1, a communication port 7 having the other end communicating with the exhaust top rear part 5, and an exhaust outlet 6 divided into upper and lower parts. The exhaust top rear portion 5 has an upwardly inclined bottom surface 9 that is continuous toward the upstream side from the communication port 7.
And a vertical rear surface 10, left and right side surfaces 11, 12; a folded upper surface 13 which is folded almost horizontally halfway to the front of the upper end of the vertical rear surface 10; and exhaust gas (indicated by an arrow) through the communication port 7. An exhaust inlet 14 provided on the folded back surface 13 for guiding the air, and an exhaust guide plate 15 which divides the exhaust inlet 14 into front and rear portions and faces the communication port 7. Both ends of the exhaust inlet 14 divided into two parts by the exhaust guide plate 15 are partially closed.

In such a conventional exhaust device for a combustor, rainwater can be prevented from entering by the exhaust guide plate 15 and the like, but the end of the exhaust guide plate 15 exists at the entrance of the exhaust inlet 14 and in the middle thereof. However, the exhaust flow collides with the end of the exhaust guide plate 15, and a large wind noise is generated. Further, since the exhaust flow branches and joins at the exhaust inlet 14 of the exhaust top 3 and inside, the exhaust flow is disturbed, and turbulent noise is generated. In addition, the pressure loss is large due to the branching and merging of the exhaust flow and the configuration that makes the exhaust flow extremely bent, and if a fan that supplies air for combustion is installed, the number of revolutions of the fan will increase. There was an adverse effect that the blowing noise and the motor noise also became loud.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an exhaust device for a combustor that has low noise and prevents rainwater from entering.

Means for Solving the Problems To solve the above problems, a combustion device of the present invention is provided with a fan installed at the bottom and supplying combustion air to a burner,
A burner downstream of the fan, a combustion chamber and a heat exchanger,
An exhaust pipe is sequentially provided in close proximity to the inside of the main body case, and an exhaust top communicating between the inside of the exhaust pipe and the outside of the main body case is provided in close contact with the downstream side of the exhaust pipe. An exhaust top rear portion integrally formed with a front portion, the exhaust top front portion has an exhaust outlet opening one end to the outside of the main body case, and a communication port communicating the other end to the exhaust top rear portion. The exhaust top rear portion is composed of a continuous rear horizontal upper surface, a rear vertical surface, an R surface, a rear bottom surface, and a rear left and right side surface. The rear horizontal upper surface is opposed to the exhaust cylinder upper surface and has an exhaust top and an exhaust top. An exhaust inflow opening communicating with the rear portion, internally having an inclined plate having both ends joined to the rear vertical surface and the rear bottom surface and having an inclined surface above the R surface, the inclined plate, the R surface, and the rear left and right side surfaces; A space portion composed of: At the opening of the inclined surface corners is obtained by constituting the resonator.

According to the present invention, the exhaust gas flowing upward in the heat exchanger and the exhaust pipe is directed to the flow direction of the exhaust gas from above to below by the exhaust inlet provided in the rear horizontal upper surface. Since it is changed into a stream and flows into the exhaust top, rainwater that invades almost horizontally from the exhaust outlet is deflected by about 90 ° from the exhaust inlet, which weakens rainwater ingress. At the same time, rainwater is U-turned at the rear horizontal upper surface where the exhaust inlet is provided to prevent rainwater from entering the exhaust pipe. In addition, the exhaust gas streamline is changed to the exhaust outlet direction by the inclination angle by the inclined plate above the R surface at the rear part of the exhaust top, thereby suppressing the generation range of the vortex generated near the R surface and the inclined plate and the R surface. Thus, a resonator can be constituted by the space formed by the above and the opening of the inclined surface corner, and wind noise and turbulent sound generated in the exhaust top can be reduced.

Embodiment Hereinafter, a case where an embodiment of the present invention is applied to a water heater will be described with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a water heater of an embodiment, FIG. 2 is a cross-sectional view of an exhaust device, and FIG. 3 is a plan view of the exhaust device as viewed from above.

A burner 21, downstream of the fan 20 for supplying combustion air,
A combustion chamber 22, a heat exchanger 23, an exhaust pipe 24, and an exhaust top 26 are provided in close contact with each other, and are housed in a main body case 25.

The exhaust top 26 is inserted into the exhaust tube 24, has an exhaust inlet 27, and is integrally formed with an exhaust top rear portion 28,
An exhaust top front section 30 provided outside the exhaust pipe 24 and having an exhaust air outlet 29 is provided. The exhaust top front section 30 and the exhaust top rear section 28 are communicated by a communication port 31. Further, the exhaust outlet 29 of the exhaust top front portion 30 has a configuration surrounded by a front bottom surface 32, a front upper surface 33, and front left and right side surfaces 34 and 35. It is connected. Further, the exhaust air outlet 29 has a louver 37 having a planar shape that is divided into upper and lower parts, and is attached to front left and right side surfaces 34 and 35. Further, a rain shield plate 38 is provided on the front flange 36 in the communication port 31 so as to face vertically downward.

On the other hand, the exhaust top rear portion 28 includes a rear horizontal upper surface 39, a rear vertical surface 40, an R surface 41, a rear bottom surface 42, rear left and right side surfaces 43 and 44, and a rear flange 45. In addition, the rear vertical surface 40 and the rear bottom surface are provided in the integrally formed exhaust top rear portion 28.
An inclined plate 47 having an inclined surface 46 is attached above the R surface 41 and has a space 48 behind the inclined surface 46 and an opening 49 at a corner.

The operation of the above configuration will be described. The combustion air supplied by the fan 20 is used for combustion by the burner 21, and then becomes exhaust gas (indicated by an arrow), reaches the combustion chamber 22, the heat exchanger 23, and receives heat. After the heat is recovered by the exchanger 23, it is guided as an upward flow into the exhaust pipe 24, and is changed into a downward flow from the exhaust inlet 27 provided on the horizontal upper surface 39 of the exhaust top rear part 28, and is introduced into the exhaust top rear part 28. enter. The exhaust top rear part 28
Is formed by integral molding. In this case, the surface connecting the rear bottom surface 42 and the rear vertical surface 40 cannot be formed as an inclined surface because the mold is pulled out during processing of the exhaust inlet 27, so that the surface becomes an R shape. However, since the inclined plate 47 is provided above the R surface 41, the exhaust gas entering the exhaust top rear portion 28 is changed in flow direction from the downward flow by the inclined plate 47 to almost the inclined plate 47 angle, and The air is guided to the exhaust top front part 30 through the communication port 31 without colliding with the bottom surface 42, and is discharged from the exhaust air outlet 29 to the outside of the main body case 25. At that time, the region of the vortex generated near the R surface 41 is suppressed, and the flow can be made smooth, and the pressure loss is reduced. A space 48 is formed by the inclined surface 46 and the R surface 41, and an opening 49 is formed at the corner of the inclined surface 46.
As a result, acoustically the space 48, the opening 49 and the inclined plate 47
A Helmholtz resonator is formed by the plate thickness, and effectively acts as a resonator against turbulent noise and wind noise generated in the exhaust top 26. The target frequency is
The thickness can be arbitrarily set by changing the thickness of the opening 48, the opening 49, and the inclined plate 47. On the other hand, rainwater enters the exhaust top 26 from the exhaust outlet 29 due to the influence of wind, etc.
The drip hits the louver 37 and the rain baffle 38, and the remainder reaches the inside of the exhaust top rear portion 28, and climbs up the rear bottom surface 42, the inclined surface 46, and the rear vertical surface 40. However, the crawling rainwater also drips on the rear horizontal upper surface 39. Also, the dripping rainwater plays a role of dampening the inflow of the inflowing rainwater, and furthermore, the rainwater entering from the exhaust air outlet 29 is deflected by approximately 90 ° with respect to the rainwater intruding from the exhaust outlet 29. Because of the exhaust inlet
Intrusion into the exhaust stack 24 beyond 27 is prevented.

Effects of the Invention As is clear from the above description, the following effects are obtained according to the exhaust device for a combustor of the present invention.

(1) Since the rear part of the exhaust top is integrally molded and the inclined plate is provided above the R surface in the rear part of the exhaust top, the cost can be reduced, and the vortex generated near the R surface of the rear part of the exhaust top due to the exhaust gas flow. Range can be suppressed,
In addition to reducing turbulence and reducing pressure loss, a cavity is formed by the space formed by the inclined surface and the R surface and the corner opening when the inclined plate is attached, which reduces sound generated in the exhaust top. can get. As a result, noise of the entire combustor discharged from the exhaust outlet can be reduced.

(2) The exhaust gas inlet is provided on the horizontal upper surface at the rear of the exhaust top so as to face the upper surface of the exhaust cylinder. Since it collides with incoming rainwater and is deflected by about 90 ° with respect to the exhaust outlet, the momentum of rainwater intrusion can be reduced and the prevention of intrusion into the exhaust pipe can be promoted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a water heater of an exhaust device of a combustor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the exhaust device, FIG. FIG. 1 is a sectional view of a conventional exhaust device, and FIG. 5 is a plan view of the exhaust device. 20 ... fan, 21 ... burner, 22 ... combustion chamber, 23 ... heat exchanger, 24 ... exhaust tube, 25 ... body case, 26 ... exhaust top, 27 ... exhaust inlet, 28 ... ... the rear of the exhaust top, 29
…… Exhaust outlet, 30 …… Exhaust top front, 31 …… Communication port, 39 …… Back horizontal top surface, 40 …… Back vertical surface, 41… R
Surface, 42 …… Bottom bottom, 43,44 …… Right side left and right, 46 ……
Inclined surface, 47 inclined plate, 48 ... space, 49 ... opening.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-213717 (JP, A) JP-A-64-38517 (JP, A) JP-A 1-312317 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F23L 17/02 602

Claims (1)

(57) [Claims] 1. A fan installed at a lower portion for supplying combustion air to a burner, a burner downstream of the fan, a combustion chamber, a heat exchanger, and an exhaust pipe are provided inside a main body case in close contact with each other. An exhaust top communicating the inside of the exhaust stack and the outside of the main body case is provided in close contact with the exhaust stack downstream, and the exhaust top comprises an exhaust top rear portion integrally formed with an exhaust top front portion, The exhaust top front has an exhaust outlet opening one end to the outside of the main body case, and a communication port communicating the other end with the exhaust top rear, and the exhaust top rear has a continuous rear horizontal upper surface. The rear vertical upper surface, the R surface, the rear bottom surface, and the rear left and right side surfaces, the rear horizontal upper surface opposes the exhaust cylinder upper surface and communicates with the exhaust cylinder interior and the exhaust top rear portion. Rear vertical and rear bottom It has an inclined plate having both ends joined and having an inclined surface above the R surface, and a space formed by the inclined plate, the R surface, and the right and left rear side surfaces, and an opening of the inclined surface corner form a resonator. Exhaust device for the configured combustor.