JP2002317922A - Exhaust pipe adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter for preventing drain from invading the combustor body, even if the exhaust pipe is installed faultily. SOLUTION: Drain generated on the inside wall of the exhaust pipe 11 comes down along the wall to the lower end of the upper connection pipe 28 in the exhaust pipe adapter and drops into a drain reservoir 26 of a drain vapor-pan 24. Most part of the combustion gas having passed through an exhaust port 8 passes through a center opening 25 of the pan 24 to the exhaust pipe 11, but part of the gas passes through the gap between the reservoir 26 and a large pipe part 22 to come into contact with and heat the bottom and side faces of the reservoir 26. Hence, drain dropped in the reservoir 26 is heated, and it becomes water vapor to flow together with the combustion gas in the exhaust pipe 11, then it is discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an exhaust pipe adapter provided in an exhaust pipe for discharging combustion exhaust gas generated from an indoor-installed combustor to the outside.

[0002]

2. Description of the Related Art A semi-hermetic indoor-installed combustor for supplying combustion air from indoors and discharging combustion exhaust gas to the outside has been known. In such a combustor, an exhaust pipe penetrating the wall of the building is disposed in order to discharge the combustion exhaust gas to the outside. However, when the combustion exhaust gas passes through the exhaust pipe, it is cooled and water vapor is condensed. Drainage may occur in the cylinder. Since this drain reacts with the sulfur component and nitrogen component in the exhaust gas and becomes strongly acidic, it needs to be discharged outside. Conventionally, as shown in FIG. (Indicated by a solid line in the figure) so that the drain is discharged from the exhaust port.

However, as shown by a broken line in FIG. 7, the exhaust pipe P is installed with an inclination in the opposite direction due to a construction error or the like, that is, the exhaust pipe P is installed so as to be inclined upward toward the outdoors. In such a case, the acid drain generated in the exhaust pipe P may flow backward and enter the combustor A to corrode the exhaust hood and the like. It is an object of the present invention to solve the above-mentioned problem and to prevent the intrusion of drain into the combustor body even if the exhaust pipe is incorrectly installed.

[0004]

According to a first aspect of the present invention, there is provided an exhaust pipe adapter for exhausting combustion exhaust gas generated from an indoor-installed combustor to the outside. An exhaust adapter provided in the
The gist of the invention is that a drain evaporator is provided for receiving a drain generated in the exhaust cylinder and flowing down along the inner wall surface of the vertical cylinder portion, and heating and evaporating the drain with combustion exhaust gas.

According to a second aspect of the present invention, there is provided the exhaust pipe adapter according to the first aspect, wherein the drain evaporating section has an annular drain having a central opening having a diameter slightly smaller than that of the vertical cylindrical section. The gist of the invention is to provide a reservoir, wherein the combustion exhaust gas is brought into contact with the bottom surface and the side surface of the annular drain reservoir, and the combustion exhaust gas is passed through the central opening of the annular drain reservoir.

According to a third aspect of the present invention, there is provided the exhaust pipe adapter according to the second aspect, wherein the annular drain reservoir section has an outer peripheral surface having substantially the same diameter as an inner wall surface of the vertical cylindrical section. The gist is that the annular drain reservoir is mounted by closely inserting the outer peripheral surface thereof into the inner wall of the vertical cylindrical portion.

According to the exhaust pipe adapter according to the first aspect of the present invention, the drain generated in the exhaust pipe and flowing backwards flows down along the inner wall surface of the vertical pipe section of the exhaust pipe, and the drain evaporator section. Can be received. Then, the drain received by the drain evaporator is heated by the heat of the combustion gas, becomes steam, flows through the exhaust stack together with the exhaust gas, and is discharged outside.

According to the exhaust pipe adapter of the second aspect of the present invention, the drain flowing down along the inner wall surface of the vertical pipe section of the exhaust pipe is received by the annular drain reservoir, and the combustion exhaust gas is deposited on the bottom and side surfaces thereof. The contact is allowed to evaporate the drain. Also,
Since the combustion exhaust gas passes through the central opening of the annular drain reservoir, the exhaust gas can be exhausted smoothly without increasing exhaust resistance so much.

According to the exhaust pipe adapter of the third aspect of the present invention, the annular drain reservoir can be directly inserted into the vertical pipe section of the exhaust pipe, thereby facilitating the mounting operation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of an exhaust pipe adapter of the present invention will be described below.

<First Embodiment> FIG. 1 is a schematic configuration diagram when an exhaust pipe adapter as one embodiment is applied to a semi-closed water heater 1. The water heater 1 has a combustion chamber 3 provided in an appliance body 2, and an air supply fan 5 connected to a DC motor 4 is attached below the combustion chamber 3.

In the combustion chamber 3, a burner 6 for mixing and burning the fuel gas and the combustion air from the air supply fan 5 in order from the bottom, and cold water supplied from the water supply pipe 13 is heated by the combustion heat of the burner 6. A fin tube type heat exchanger 7 for heating and sending the heated water to the tapping pipe 14 is provided. Above the heat exchanger 7, there is provided an exhaust hood 9 to which a tubular exhaust port 8 for discharging the combustion exhaust gas after heat exchange to the outside of the appliance is connected. The exhaust port 8 is connected to an exhaust pipe adapter 1 for drain evaporation described later.
0, it is connected to an exhaust stack 11 that guides the combustion exhaust gas to the outside. The exhaust pipe 11 includes a vertical exhaust pipe section 11a connected to the exhaust pipe adapter 10 and disposed in a vertical direction, and an elbow 1
A horizontal exhaust cylinder portion 11c connected to the vertical exhaust cylinder portion 11a via the first exhaust cylinder portion 1b and disposed in the horizontal direction, and an exhaust cylinder top 12 connected to the tip of the horizontal exhaust cylinder portion 11c and facing the outdoors.

The water supply pipe 13 is provided with a water side control unit 16 having a water flow sensor and a water governor, and the gas pipe 17 to the burner 6 is provided with a main solenoid valve 18 and a gas proportional valve 19. Further, a water flow sensor in the water side control unit 16, the main solenoid valve 18, the gas proportional valve 19, the DC motor 4, and the like are electrically connected to a burner controller 20 for controlling the combustion of the water heater 1. .

In the water heater 1 configured as described above, when a hot water tap (not shown) is opened, water (dashed arrow in the figure) flows through the water supply pipe 13, and the detection signal from the water amount sensor in the water side control unit 16 is used. First, a predetermined pre-purge is performed by the air supply fan 5, then the main solenoid valve 18 and the gas proportional valve 19 of the burner 6 are opened to supply gas (solid arrow in the drawing) to the burner 6, and the burner 6 6 is ignited and hot water temperature control is started.

During such combustion, the air supply fan 5
With the operation, the outside air is sucked into the appliance main body 2 from the air supply port 21 provided in the appliance main body 2, introduced into the burner 6, and provided for combustion as combustion air. The high-temperature combustion gas from the burner 6 passes through the heat exchanger 7 and exchanges heat with water, and is discharged from the exhaust port 8 to the outside through the exhaust pipe 11. At this time, the combustion exhaust gas passing through the exhaust port 8 is not cooled as much as the drain is generated due to the short distance from the outlet of the heat exchanger 7, but is cooled while passing through the exhaust stack 11. Drain may be generated on the inner wall surface.

Normally, the lateral exhaust cylinder portion 11c of the exhaust cylinder 11 is
Since the exhaust pipe top 12 provided at the tip is installed so as to be inclined so that the side thereof is downward, the drain generated in the lateral exhaust pipe section 11c flows down to the exhaust pipe top 12 side, and the exhaust pipe It is discharged from the top 12 to the outside. However, due to mistakes during construction, etc.,
However, as shown in FIG. 1, when installed at a reverse slope, the generated drain flows down the inner wall of the exhaust pipe 11 and into the appliance. Therefore, the exhaust adapter 10 of the present embodiment is
Receiving the drain that has flowed down, the drain is heated by the combustion exhaust gas to evaporate, thereby preventing the intrusion of the drain into the instrument body.

Hereinafter, the exhaust pipe adapter 10 will be described with reference to FIG.
This will be described in detail with reference to FIG. As shown in FIG. 2, the exhaust pipe adapter 10 includes a cylindrical frame 23 having a large-diameter thick cylindrical section 22 in the center, and a drain evaporating dish housed in the thick cylindrical section 22 of the frame 23. 24. Drain evaporating dish 24
Is made of a corrosion-resistant material, and as shown in FIG.
An annular drain reservoir 26 is provided, and the inner peripheral wall thereof is folded back into a cylindrical shape to form a central opening 25 serving as an exhaust passage. As shown in FIG. 4, the drain evaporating dish 24 is fixed to the inside of the thick cylindrical portion 22 with a gap between the inner wall of the thick cylindrical portion 22 by using a stopper 27. FIG. 4 is a cross-sectional view taken along dashed-dotted line AA in FIG. 2 when the exhaust pipe adapter 10 is mounted between the vertical exhaust pipe section 11a and the exhaust port 8. The exhaust pipe adapter 10 has an upper connection pipe section 28 at an upper portion of the frame 23 inserted into the vertical exhaust pipe section 11a, and an exhaust port 8 inserted into a lower connection pipe section 29 at a lower portion, and is attached with a screw (not shown). It is fixed. Further, the lower end of the upper connection tubular portion 28 is configured to protrude into the thick tubular portion 22.

The drain generated on the inner wall surface of the exhaust pipe 11 is
The gas flows down the inner wall surface to the lower end of the upper connection tube portion 28 of the exhaust tube adapter 10 described above, and drops into the drain reservoir 26 of the drain evaporating dish 24. At this time, the lower end of the upper connection tubular portion 28 projects into the thick tubular portion 22 and the projected portion functions as a drain drip guide.
It does not reach the inner wall of the building. Most of the flue gas that has passed through the exhaust port 8 passes through the central opening 25 formed in the center of the drain evaporating dish 24 toward the exhaust stack 11. Tube part 22
And heats by contacting the bottom and side surfaces of the drain reservoir 26. For this reason, the drain dropped into the drain reservoir 26 is heated, becomes steam, flows in the exhaust pipe 11 together with the combustion exhaust gas, and is discharged outside. In this case, in addition to making the inner diameter of the drain reservoir 26 slightly smaller than the inner diameter of the vertical exhaust cylinder 11a, the flow path of the combustion exhaust gas is also provided in the gap between the drain reservoir 26 and the thick cylinder 22. Therefore, even if a resistor such as the exhaust pipe adapter 10 is provided in the exhaust path, the exhaust resistance hardly increases. still,
If the drain evaporating dish 26 of the present embodiment does not provide sufficient heat to evaporate the generated drain, FIG.
As indicated by the middle dotted line, the inner peripheral wall of the drain evaporating dish 24 forming the central opening 25 can be further extended upward to increase the contact area with the combustion exhaust gas and increase the heating amount. Further, the inner surface of the drain evaporating dish 24 may be subjected to hydrophilic treatment. By doing so, the drain spreads over the entire drain evaporating dish 24, so that the drain can be more appropriately heated and evaporated.

Therefore, the drain generated in the exhaust stack 11 is
It can be prevented from flowing along the inner wall surface into the appliance, and the exhaust hood 9 and the like in the appliance can be prevented from being corroded by the drain. Moreover, even if the exhaust pipe adapter 10 is attached, the exhaust resistance hardly increases, so that the combustion of the burner 6 can be favorably maintained.

Further, since the drain is acidic, it must be neutralized before being discharged to a general drainage passage such as a sewer. Therefore, if the neutralizing device is provided, the production cost becomes extremely high. However, in this embodiment, the collected drain is re-evaporated and discharged together with the combustion exhaust gas, so that a neutralizing device is not required and the manufacturing cost can be reduced. Further, since the exhaust pipe adapter 10 is simply interposed between the vertical exhaust pipe section 11a and the exhaust port 8, the mounting work of the exhaust pipe adapter 10 is easy, and the hot water supply already installed is also provided. It can also be applied to vessels. Further, since the exhaust pipe adapter 10 has a simple structure in which the frame 23 and the drain evaporating dish 24 are simply combined, it can be implemented at low cost.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. Note that portions different from the first embodiment will be described, and the same reference numerals will be given to the overlapping portions, and description thereof will be omitted.

The exhaust pipe adapter 30 according to the second embodiment includes:
The drain evaporating dish 24 of the first embodiment has a shape in which the cylindrical wall forming the central opening 25 is extended upward, and the frame 23 is not required. That is, as shown in FIG. 5, the exhaust pipe adapter 30 of the second embodiment includes an annular drain storage section 34 and a cylindrical section in which the inner peripheral wall of the drain storage section 34 is long folded back to form a central opening 31. 32. A drain discharge pipe passage hole 33 is opened in a side wall near the upper end of the cylindrical portion 32. Also, the drain reservoir 3
An O-ring groove 35 for fitting the O-ring is provided on the outer peripheral surface of the fourth member 4.

As shown in FIG. 6, the exhaust pipe adapter 30 is closely inserted and mounted on the inner wall of the vertical exhaust pipe section 11a. And the exhaust port 8 is the vertical exhaust cylinder 11
a and is fixed by screws (not shown). FIG. 6 is a dashed line B in FIG. 5 when the exhaust pipe adapter 30 is inserted into the vertical exhaust pipe section 11a.
It is sectional drawing in -B. Since the upper end portion of the outer peripheral surface of the drain reservoir 34 is bent inward to form the bent portion 38, the exhaust pipe adapter 30 can be smoothly inserted into the vertical exhaust pipe section 11a. As described above, since the exhaust pipe adapter 30 can be mounted simply by being inserted into the vertical exhaust pipe section 11a, the mounting operation is extremely easy. In order to prevent the exhaust pipe adapter 30 from falling off, a fixing pin (not shown) may be driven below the exhaust pipe adapter 30 from outside the vertical exhaust pipe section 11a.

The exhaust pipe adapter 30 of the second embodiment
According to this, when the drain generated on the inner wall surface of the exhaust pipe 11 flows down to the exhaust pipe adapter 30, first, the drain accumulates between the inner wall surface of the vertical exhaust pipe section 11 a and the bent section 38. . At this time, the outer peripheral surface of the drain reservoir 34 and the vertical exhaust cylinder 1
An O-ring 39 is fitted between the inner wall surface of 1a and
Since it is sealed, the drain does not continue downward through the gap. Then, when the drain is fully accumulated between the inner wall surface and the bent portion 38, the drain drops into the drain reservoir 34.

Therefore, the drain collected between the inner wall surface and the bent portion 38 and in the drain reservoir 34 is heated and evaporated by the combustion exhaust gas as in the case of the first embodiment.
It is discharged outside together with the combustion exhaust gas. If a large amount of drain is generated and the amount of generated drain is larger than the amount of evaporated, and it is expected that the drain will spill into the apparatus main body from the drain reservoir 34, the drain discharge is performed. One end of a heat-resistant tube 40 for discharging drain is inserted into the pipe passage hole 33 without any gap, and the other end is passed through the inside of the device and guided to the outside of the lower device, so that drain is discharged through the heat-resistant tube 40. can do. Drain discharged out of the device is received in a bucket or the like, neutralized, and discarded in a general drain.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it is needless to say that the present invention can be carried out in various modes without departing from the gist of the present invention. is there. For example, in the present embodiment, the application to the exhaust pipe of a water heater has been described, but the above-described exhaust pipe adapter may be applied to an exhaust pipe such as a gas stove.

[0027]

As described in detail above, claim 1 of the present invention
According to the exhaust pipe adapter described above, in order to prevent the drain generated in the exhaust pipe from entering the combustor main body, corrosion of the combustor main body can be prevented. As a result, the durability of the combustor itself can be improved, and the deterioration of combustion performance due to corrosion can be prevented.

According to the exhaust pipe adapter of the second aspect of the present invention, since the drain reservoir is formed in an annular shape, the exhaust gas can smoothly pass through the central opening thereof, and the bottom of the annular drain reservoir can be formed. In addition, the drain can be effectively heated and evaporated on the side surface.

Further, according to the exhaust pipe adapter of the third aspect of the present invention, the work of attaching the exhaust pipe to the exhaust pipe becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater provided with an exhaust pipe adapter of a first embodiment.

FIG. 2 is an external view of a frame of the exhaust pipe adapter according to the first embodiment.

FIG. 3 is an external view of a drain evaporation dish of the exhaust pipe adapter of the first embodiment.

FIG. 4 is a sectional view of the exhaust pipe adapter of the first embodiment.

FIG. 5 is an external view of an exhaust pipe adapter according to a second embodiment.

FIG. 6 is a sectional view of an exhaust pipe adapter according to a second embodiment.

FIG. 7 is a schematic configuration diagram of a combustor provided with an exhaust pipe as a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water heater, 8 ... Exhaust port, 10, 30 ... Exhaust adapter, 11 ... Exhaust cylinder, 11a ... Vertical exhaust cylinder part, 11c ... Horizontal exhaust cylinder part, 22 ... Thick cylinder part, 23 ... Frame body, 24 ... Drain Evaporating dishes, 25, 31 ... central openings, 26, 34 ... drain reservoirs.

Claims (3)

[Claims] 1. An exhaust pipe adapter provided in a vertical pipe section of an exhaust pipe for discharging combustion exhaust gas generated from an indoor-installed combustor to the outside, wherein the inner wall surface of the vertical pipe section generated in the exhaust pipe. An exhaust pipe adapter comprising: a drain evaporator that receives a drain flowing down along a drain and heats the drain with combustion exhaust gas to evaporate the drain. 2. The drain evaporator includes an annular drain reservoir having a central opening having a diameter slightly smaller than the vertical cylinder,
2. The exhaust adapter according to claim 1, wherein the combustion exhaust gas is brought into contact with the bottom and side surfaces of the annular drain reservoir, and the exhaust gas is passed through a central opening of the annular drain reservoir. 3. An annular drain reservoir having an outer peripheral surface having substantially the same diameter as an inner wall surface of the vertical cylindrical portion, wherein the annular drain reservoir is inserted with its outer peripheral surface in close contact with the inner wall of the vertical cylindrical portion. The exhaust adapter according to claim 2, wherein the adapter is mounted.