JPH11337053A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect the outer surface of a combustor against corrosion due to acid drain by extending an exhaust tube downward from an exhaust opening to a drain neutralizer and interconnecting the exhaust tube and the drain neutralizer. SOLUTION: A storage water heater body 10 is provided with a main heat exchanger 1a and a sub-heat exchanger 1b. A drain collecting case 110 containing a neutralization agent N is disposed under the body 10 through a drainage pipe 111. An exhaust tube 3 passing combustion exhaust gas from the sub-heat exchanger 1b is projecting from the side wall of the body 10. The exhaust tube 3 comprises a first inclining tube section 21, a second tube section 22, and a third inclining tube section 23. The third inclining tube section 23 is fixed with a tubular exhaust cover 24 while penetrating a front plate 12. Drain adhering to the third inclining tube section 23 flows down to the inner plate thereof thence flows through the second tube section 22 to the inclining face of the first inclining tube section 21 and to the inclining face of the bottom wall 101 before reaching the inlet of the drainage pipe 111. The drain is passed through the drainage pipe 111 and contained in the drain collecting case 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a structure of an exhaust stack of a combustion appliance provided with a heat exchanger for absorbing sensible heat and latent heat of combustion exhaust gas.

[0002]

2. Description of the Related Art A water heater as shown in FIG. The water heater (1) shown in FIG.
a) and a sub heat exchanger (1b) are provided, and after the sensible heat of the combustion exhaust gas is absorbed by the main heat exchanger (1a), the sub heat exchanger (1b)
The so-called condensing type is also used to absorb latent heat. In this water heater (1), the main heat exchanger (1a) and the sub heat exchanger (1b) are housed in a can (10), and the main heat exchanger (1a) is 1b), and above the main heat exchanger (1a), an all-primary pneumatic gas burner that burns gas supplied from the gas supply path (20).
(2a) is provided. And at the upper end of the can body (10),
A fan (2b) that supplies air sucked from the outside to the gas burner (2a) as combustion air is provided.

The combustion exhaust gas from the gas burner (2a) is supplied to a fan
The heat is sent downward by (2b) to heat the main heat exchanger (1a) and the sub heat exchanger (1b). The main heat exchanger (1a) includes a number of fins (16) arranged in a substantially vertical posture, and a first water pipe (14) including a plurality of pipes penetrating the fins (16). The heat exchanger (1b) also has a large number of fins (1
7) and a second water pipe (1
5). The upstream end of the second water pipe (15) is a water supply source (not shown) such as a water pipe or a return pipe of a circulation path of a hot water heater.
And a downstream end thereof is connected to an upstream end of the first water pipe (14). The downstream end of the first water pipe (14) is provided with hot water heated in the main heat exchanger (1a) and the sub heat exchanger (1b) in a bathroom, a kitchen curan or a hot water heater (not shown). To the hot water supply path (19) leading to the hot water.

[0004] The bottom wall (101) of the can body (10) is funnel-shaped, and is connected to a drain collection vessel (11) through a drain discharge pipe (111).
0). In the drain collection container (110), a can
A neutralizing agent (N) for neutralizing the drain generated in (10) is contained. From the side wall of the can (10) above the bottom wall (101) and below the sub heat exchanger (1b), the combustion exhaust gas after passing through the sub heat exchanger (1b) is discharged to the outside. Exhaust stack for
The first tubular portion (31) of (3) projects substantially horizontally, and the first tubular portion (31)
A second cylindrical portion (32) extends substantially vertically upward from the downstream end of (31), and a third cylindrical portion (33) protrudes from the upper end so as to be open to the outdoors. ing. 3rd cylinder (3
The open end of 3) protrudes outward from the front plate (12) and
(30) is formed, and a drain hole (11) for discharging rain blown from outside is opened near the exhaust port (30).

When an operation switch (not shown) is turned on, the water heater (1) operates a fan (2b) to operate a gas burner.
(2a) burns to generate combustion exhaust. This combustion exhaust heats the main heat exchanger (1a) and the sub heat exchanger (1b). At this time, the sensible heat of the combustion exhaust is absorbed by the main heat exchanger (1a), and the latent heat is absorbed by the sub-heat exchanger (1b) from the combustion exhaust after the absorption of the sensible heat. In the latent heat absorption, the combustion exhaust gas is cooled below the dew point, and drain adheres to the surface of the sub heat exchanger (1b) due to condensation of water vapor in the combustion exhaust gas. After the drain is dropped on the bottom wall (101), the drain collection container (1) is passed through a drain discharge pipe (111) provided at the lower end of the can body (10).
Runs down to 10).

[0006] Although acidic components such as nitrogen oxides contained in the combustion exhaust gas are dissolved in the drain, it is neutralized by a neutralizing agent (N) contained in a drain recovery container (110). After that, it is discharged to the outside of the water heater (1). Further, the combustion exhaust gas that has passed through the sub heat exchanger (1b) is discharged from the can body (10) to the exhaust pipe.
(3) flows into the first cylindrical portion (31), and the second cylindrical portion (32) and the third cylindrical portion (32).
The exhaust gas is exhausted from the exhaust port (30) to the outside via the cylindrical portion (33) in sequence.As described above, the combustion exhaust gas has a low temperature due to the latent heat being absorbed, and is in a state where the steam is saturated. Has become. In winter, drain is likely to occur in the third cylindrical portion (33) having the exhaust port (30) open to the outside air.

[0007]

In the above-mentioned conventional exhaust stack (3) for a combustion apparatus, the drain adhering to the inner peripheral wall of the third tubular portion (33) passes through the drain hole (11) through the drain hole (11). It falls on the ground along the outer surface of the front plate (12) of the water heater (1). The drain contains nitrogen oxides and sulfur oxides in the combustion exhaust gas, similar to the drain generated in the can body (10).
H = about 3 acidity. Therefore, rust is easily generated along the drain after passing through the front plate (12), and there is a disadvantage that the front plate (12) is corroded.

The present invention provides a heat exchanger that absorbs sensible heat and latent heat from combustion exhaust, a drain neutralizer that collects and neutralizes the drain generated by the latent heat absorption of the heat exchanger, and discharges the drain. In the combustion apparatus provided with an exhaust pipe for discharging the combustion exhaust gas after passing through the heat exchanger from the exhaust port at the most downstream end to the outside of the apparatus, acidic drain generated in the exhaust pipe is discharged to the outside In this case, it is an object to prevent the outer surface and the like of the appliance from being corroded by the drain.

[0009]

Means for Solving the Problems The solution of the present invention taken to solve the above-mentioned problem is that the exhaust pipe continuously descends from the exhaust port to the drain neutralizer, It is configured to communicate with the inside of the drain neutralization device ”. The above solution works as follows.

[0010] The combustion exhaust gas discharged from the exhaust port to the outside of the appliance through the exhaust pipe has a low temperature and is saturated with water vapor since the sensible heat and the latent heat are absorbed by the heat exchanger. It is in a state. For this reason, especially in winter, a large amount of drain is generated in the exhaust pipe near the exhaust port close to the outside air. The exhaust stack is configured to continuously descend from the exhaust port to the drain neutralizer, and to communicate with the drain neutralizer,
All of the drain generated in the exhaust stack flows down toward the drain neutralizer, and is sent to the drain neutralizer together with the drain generated inside the device, where the drain is generated. It is neutralized and discharged outside.

[0011]

According to the present invention having the above configuration, the following specific effects are obtained. Since the drain generated in the exhaust pipe is configured to flow into the drain neutralization device without being discharged from the exhaust port to the outside of the apparatus, even if the drain has an acidic property, After being surely neutralized within, it is discharged outside. Therefore, there is no inconvenience that the outer surface of the appliance is corroded by the drain discharged to the outside.

[Others] In the above invention, "the exhaust cylinder is a first inclined cylinder portion communicating with the drain neutralizer,
A second cylinder portion that is continuous with the upper end of the first inclined cylinder portion and extends substantially vertically upward; a third inclined cylinder portion that is continuous with the upper end of the second cylinder portion and rises toward the exhaust port; The drain generated in the third inclined cylinder portion flows to the upper end of the second cylinder portion with the inclination of the third inclined cylinder portion, and falls in the second cylinder portion as it is. And
It reaches the upper end of the first inclined cylindrical portion. Then, the first
It flows in the inclined cylinder portion and flows down to the drain neutralization device. Therefore, even if the drain adheres to the vicinity of the exhaust port, it can be easily and surely recovered in the drain neutralizing device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described together with the illustrated example. FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof. The water heater used in the embodiment of the present invention has a so-called condensing boiler that absorbs the sensible heat and latent heat of the combustion exhaust gas, as in the conventional example.

That is, the main heat exchanger (1) is placed in the can (10).
a), the sub heat exchanger (1b) is accommodated below it, and the gas burner (2a) and gas burner are installed above the main heat exchanger (1a).
(2a) is provided with a fan (2b) for supplying combustion air.Below the can body (10), a drain collection container (110) containing a neutralizing agent (N) is provided with a drain discharge pipe. (111).

The bottom wall (101) of the can (10) is connected to the drain discharge pipe (1).
11) and descends toward the bottom wall (10
(1) above and above the sub-heat exchanger (1b).
An exhaust pipe (3) through which the combustion exhaust gas having passed through the sub heat exchanger (1b) passes projects from the side wall of (0). Exhaust stack
(3) is a first inclined cylinder (21) rising from the bottom wall (101) toward the outside of the can body (10), and a substantially vertical upward from the downstream end of the first inclined cylinder (21). A second cylindrical portion (22) extending in the direction, and a third inclined cylindrical portion (23) rising from the upper end of the second cylindrical portion (22) toward the front plate (12). At the downstream end of the third inclined tubular portion (23), a shallow tubular exhaust cover (24) is attached so as to penetrate the front plate (12). Each of these tube parts (21) (22)
The (23) and the exhaust cover (24) are each formed in a hollow cylindrical body having a rectangular shape with a horizontally long cross section.

Hereinafter, the manner of mounting each cylinder will be described. A flange portion (22a) is continuously provided at the upper end of the second cylindrical portion (22), and the flange portion (22a) is formed at the periphery of the opening (27) of the bottom plate (26) of the third inclined cylindrical portion (23). Is screwed via an annular packing (41). The bottom plate (26) is an outer plate (26
a) and an inner plate (26b), and a packing (42) is interposed between the outer plate (26a) and the inner plate (26b). In the bottom plate (26), the peripheral portion of the opening (27) corresponding to the flange portion (22a) has the flange portion (22).
a) is parallel to the horizontal plane, and the surface from the edge of the horizontal plane to the downstream end is an inclined surface that rises obliquely toward the downstream end.

The top surface of the third inclined cylindrical portion (23) is also inclined along the inclination of the bottom plate (26), and its downstream end is bent downward to form a hanging surface (28a). Further, the downstream end of the outer plate (26a) is also bent downward to form a hanging surface (26c). The exhaust cover (24) is a cover body (24a) that passes through the front plate (12).
And a flange portion (24b) projecting outward from the entire inner open end of the cover body (24a), and an exhaust port (25) is opened in the front wall of the cover body (24a). I have. An annular peripheral wall having a substantially L-shaped cross section following the side wall of the cover body (24a) at the peripheral edge of the exhaust port (25) serves as the receiving portion (24c).

The flange portion (24b) has a hanging surface (28) located above and below the third inclined cylindrical portion (23) inside the front plate (12).
a) It is screwed to the (26c) and the projecting surface (not shown) projecting to the side thereof via an annular packing (43). Also, an exhaust port packing (44) is interposed between the flange (25b) and the front plate (12). Among the exhaust pipes (3) of this embodiment, the first inclined pipe section (21) and the third inclined pipe section (2
3) is an inclined cylinder which rises toward the outside of the instrument, and the two are connected by the second cylinder part (22) in a vertical posture, so that the downstream end of the third inclined cylinder part (23) Exhaust port (2
From (5), the first inclined cylindrical portion (2) connected to the funnel-shaped bottom wall (101)
Up to the upstream end of (1), the apparatus is continuously lowered toward the upstream side inside the device. Therefore, the drain adhering to the third inclined cylindrical portion (23) is discharged from the inner plate (2) of the bottom plate (26) of the third inclined cylindrical portion (23).
6a), flows down on the inclined inner plate (26a), passes through the second cylindrical portion (22), forms the first inclined cylindrical portion (21), and further has a bottom wall ( 101) Runs down the slope and reaches the inlet of the drain discharge pipe (111). Then, through the drain discharge pipe (111), the drain collection container (11
0) housed inside.

The downstream end of the third inclined cylindrical portion (23) is connected to the front plate (12).
It is opened outward through an exhaust cover (24) penetrating through. At this time, the cover body (24a) of the exhaust cover (24)
If it is set so as to be higher than the inner plate (26a) of the bottom plate (26) of the third inclined cylinder portion (23), the drain generated in the exhaust cylinder (3) will It does not flow outward from 23). That is, the drain generated in the exhaust pipe (3) is not discharged to the outside along the front plate (12).

When rain is blown into the exhaust cover (24), the rain also passes through the exhaust pipe (3) together with the drain, is housed in the drain recovery container (110), and is discharged therefrom. The Rukoto. 3 and 4 are a configuration diagram and a main part enlarged cross-sectional view of a water heater according to a second embodiment of the present invention.

In this embodiment, the exhaust pipe (3) is constituted by only the third inclined pipe section (23). The exhaust pipe (3) is located above the bottom wall (101) and is connected to the auxiliary heat exchanger (1b). ) From the side wall of the can body (10) corresponding to the third inclined cylindrical portion (2) toward the front plate (12).
3) is directly protruded. That is, the auxiliary heat exchanger (1b) is located above the exhaust pipe (3). The bottom surface of the third inclined cylindrical portion (23) is an inclined surface that is continuous with a bottom wall (101) composed of an inclined surface descending toward the inlet of the drain discharge pipe (111), and is connected to the front plate (12). The third inclined cylinder (2
At the downstream end of (3), the exhaust pipe (3) of the first embodiment
Similarly to the above, an exhaust cover (24) having an exhaust port (25) opened is attached.

In the water heater of this embodiment, the top surface (29) of the third inclined cylindrical portion (23) has an opening (2) opening to the lower end of the can body (10).
10) is an open horizontal surface, and the outer plate (29a) and the inner plate
(29b) and a packing (45) is interposed between them. Secondary heat exchanger (1
At the lower end of the can (10) containing the b), a flange (1
0a) protrudes outward, and this flange (10a)
Is screwed through a packing (46) to the peripheral portion of the opening (210) of the outer plate (29a) of the top surface (29).

At the downstream end of the third inclined cylindrical portion (23), a flange (211) formed by bending the outer plate (29a), the bottom surface and the side surfaces vertically outward over the entire circumference protrudes. The flange (211) is attached to the flange (24b) of the exhaust cover (24).
Is screwed via a packing (43), so that the exhaust cover (24) is attached to the downstream end of the third inclined tubular portion (23). Between the flange portion (24b) and the front plate (12), as in the case of the first embodiment, the exhaust port packing (4) is provided.
4) is interposed.

In the water heater of this configuration, the drain attached near the exhaust port (25) travels along the bottom surface of the third inclined cylinder (23),
It flows down to the inlet of the drain discharge pipe (111) and is stored as it is in the drain recovery container (110). Thus, the exhaust
Since the distance from (25) to the inlet of the drain discharge pipe (111) is shortened, the drain generated in the exhaust stack (3) can be reliably and promptly stored in the drain collection container (110). it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a configuration diagram of a water heater according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of FIG. 3, from which the internal structure is omitted.

FIG. 5 is a configuration diagram of a conventional condensing type water heater.

[Explanation of symbols]

 (1) ··· Heat exchanger (110) · · · Drain neutralizer (25) · · · Exhaust port (3) · · · · Exhaust cylinder Part is shown.)

Claims (2)

[Claims] 1. A heat exchanger that absorbs sensible heat and latent heat from combustion exhaust gas, a drain neutralizer that collects and neutralizes drain generated by latent heat absorption of the heat exchanger, and discharges the drain.
In a combustion apparatus having an exhaust pipe for discharging combustion exhaust gas after passing through the heat exchanger from the exhaust port at the most downstream end to the outside of the apparatus, the exhaust pipe continuously connects from the exhaust port to the drain neutralization device. A combustion appliance which is configured to communicate with the drain neutralization device. 2. The exhaust cylinder includes a first inclined cylinder that communicates with the drain neutralizer, and a second cylinder that is continuous with an upper end of the first inclined cylinder and extends upward in a substantially vertical direction. A third inclined cylindrical portion which is continuous with an upper end of the second cylindrical portion and rises toward the exhaust port.
A combustion appliance according to claim 1.