JP2022159609A - Compound combustion device and connection adapter - Google Patents

Abstract

To prevent backflow of combustion exhaust from a collective exhaust cylinder to a combustion device being under combustion stop even when drain water generated in the collective exhaust cylinder flows into a connection adapter, and secure smooth discharge of combustion exhaust from a combustion device being under combustion operation to the collective cylinder.SOLUTION: A connection adapter 7 is arranged between an instrument-side exhaust part 5 and a collective exhaust pipe 10. The connection adapter 7 has: a first exhaust pipe 70 connected to an instrument-side exhaust pipe 50 on a lower end side; a backflow prevention valve 75 that is provided at an upper end side opening part of the first exhaust pipe 70, and prevents backflow of combustion exhaust from the collective exhaust pipe 10 to an instrument body 20 being under combustion stop; and a second exhaust pipe 80 that is provided so as to surround the outer periphery of the first exhaust pipe 70, is connected to the drain water collection part 55 on a lower end side, and is connected to the collective exhaust pipe 10 on an upper end side.SELECTED DRAWING: Figure 4

Description

The present invention relates to a composite combustion device and a connection adapter used therefor. In particular, the present invention relates to improvements in connection adapters that are arranged between each instrument-side exhaust section of a plurality of combustion devices and a collective exhaust stack.

Multiple combustion devices each having a burner and a combustion fan are installed side by side, and a combined exhaust pipe for discharging the combustion exhaust emitted from each combustion device to the outside. be. In this type of composite combustion system, the number of operating combustion systems is adjusted according to the load. Therefore, there is a risk that the combustion exhaust gas may flow back from the combustion device in combustion operation to the combustion device in which combustion is stopped via the collective exhaust pipe. In order to prevent the backflow of combustion exhaust gas as described above, it has been proposed to provide a check valve in a connection adapter arranged between each combustion device and a collective exhaust stack (for example, Patent Document 1). .

JP 2016-90208 A

By the way, in the composite combustion apparatus as described above, when the combustion exhaust gas passes through the stacking exhaust pipe, the water vapor contained in the combustion exhaust gas is condensed due to the decrease in temperature, and drain water is generated. Drain water flows into the connection adapter along the If such drain water accumulates in the connection adapter, the drain water will hinder the opening and closing of the check valve. As a result, there is a problem that the passage resistance of the combustion exhaust gas increases and the backflow prevention function deteriorates. Moreover, if the drain water freezes in the connection adapter in winter and the check valve is not opened, there is a problem that the combustion exhaust gas is not discharged to the collective exhaust pipe.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to prevent combustion from the collective exhaust pipe to a combustion device whose combustion is stopped even if drain water generated in the collective exhaust pipe flows into the connection adapter. It is an object of the present invention to prevent backflow of exhaust gas and to ensure smooth discharge of combustion exhaust gas from a combustion device during combustion operation to a collective exhaust stack.

According to one aspect of the invention,
a plurality of combustion devices separately provided with an instrument-side exhaust pipe through which combustion exhaust is discharged from the instrument body and an instrument-side exhaust part having a drain water recovery part provided so as to surround the outer periphery of the instrument-side exhaust pipe;
a collective exhaust pipe that collects and discharges the combustion exhaust discharged from the instrument-side exhaust pipe of each combustion device to the outside;
A composite combustion device having a connection adapter disposed between an instrument-side exhaust part of each combustion device and a collective exhaust stack,
The connection adapter
a first exhaust pipe connected to the instrument-side exhaust pipe on the lower end side;
a check valve provided at the upper end side opening of the first exhaust pipe for preventing backflow of combustion exhaust gas from the collective exhaust pipe to the combustion device during combustion stop;
A second exhaust pipe is provided so as to surround the outer circumference of the first exhaust pipe, is connected to the drain water collection section at the lower end side, and is connected to the collective exhaust pipe at the upper end side.

According to the above composite combustion device, when the drain water generated in the collective exhaust pipe flows into the connection adapter, the drain water flows along the inner peripheral surface of the second exhaust pipe surrounding the outer periphery of the first exhaust pipe. It is recovered by the drain water recovery part provided in the instrument side exhaust part. Therefore, even if drain water flows into the connection adapter, the opening and closing of the check valve provided at the upper end side opening of the first exhaust pipe is not hindered by the drain water. As a result, the combustion exhaust gas can be prevented from flowing back from the exhaust stack to the combustion device whose combustion is stopped, and the combustion exhaust gas can be smoothly discharged from the combustion device during combustion operation to the exhaust stack.

Preferably, in the above composite combustion device,
The drain water recovery unit has a drain water storage unit provided on the outer circumference of the instrument-side exhaust pipe, and a drain water discharge unit for discharging the drain water from the drain water storage unit to the outside,
The lower end of the first exhaust pipe is positioned below the lower end of the second exhaust pipe,
The device-side exhaust part and the connection adapter are configured such that the first exhaust pipe is fitted to the device-side exhaust pipe, and the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the device-side exhaust pipe is drained. It is connected so as to be water-sealed by drain water flowing into the water reservoir.

According to the composite combustion device, when the first exhaust pipe is fitted onto the instrument-side exhaust pipe, the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the instrument-side exhaust pipe becomes the drain water reservoir. Even if the inner peripheral surface of the first exhaust pipe and the outer peripheral surface of the instrument-side exhaust pipe are not completely sealed, the backflow of combustion exhaust from the collective exhaust pipe is prevented. can be prevented.

Preferably, in the above composite combustion device,
The instrument-side exhaust section has an instrument-side air supply pipe provided so as to surround the outer periphery of the drain water recovery section,
The connection adapter is provided so as to surround the outer periphery of the second exhaust pipe, and has an air supply pipe connected to the instrument side air supply pipe on the lower end side,
The air supply pipe has an air supply section for introducing outside air.

According to the above composite combustion apparatus, a double-pipe closed forced-exhaust combustion apparatus can be suitably used as the combustion apparatus of the composite combustion apparatus.

Preferably, in the above composite combustion device,
The connection adapter has an opening area variable part that can change the opening area of the air supply part.

According to the composite combustion system, the amount of air introduced into the combustion system can be changed according to the passage resistance and the specifications of the combustion system. It can be used more preferably as a combustion device of a composite combustion device.

Also, according to another aspect of the present invention,
a plurality of combustion devices separately provided with an instrument-side exhaust pipe through which combustion exhaust is discharged from the instrument body and an instrument-side exhaust part having a drain water collection part provided so as to surround the outer periphery of the instrument-side exhaust pipe; It is used in a combined combustion device having a collective exhaust pipe for collecting and discharging combustion exhaust emitted from the instrument side exhaust pipe of the device to the outside, and is arranged between the instrument side exhaust part of each combustion device and the collective exhaust pipe. a connection adapter provided,
a first exhaust pipe connected to the instrument-side exhaust pipe on the lower end side;
a backflow prevention valve provided at the upper end side opening of the first exhaust pipe for preventing backflow of combustion exhaust gas from the collective exhaust pipe to the combustion device during combustion stop;
A connection adapter is provided that has a second exhaust pipe that is provided so as to surround the outer periphery of the first exhaust pipe, is connected to the drain water recovery section on the lower end side, and is connected to the collective exhaust pipe on the upper end side.

According to the connection adapter, when the drain water generated in the collective exhaust pipe flows into the connection adapter, the drain water travels along the inner peripheral surface of the second exhaust pipe surrounding the outer periphery of the first exhaust pipe. It is recovered by the drain water recovery section provided in the side exhaust section. Therefore, even if drain water flows into the connection adapter, the opening and closing of the check valve provided at the upper end side opening of the first exhaust pipe is not hindered by the drain water. As a result, the combustion exhaust gas can be prevented from flowing back from the exhaust stack to the combustion device whose combustion is stopped, and the combustion exhaust gas can be smoothly discharged from the combustion device during combustion operation to the exhaust stack.

Preferably, in the connection adapter,
The drain water recovery unit has a drain water storage unit provided on the outer circumference of the instrument-side exhaust pipe, and a drain water discharge unit for discharging the drain water from the drain water storage unit to the outside,
The lower end of the first exhaust pipe is positioned below the lower end of the second exhaust pipe,
The device-side exhaust part and the connection adapter are configured such that the first exhaust pipe is fitted to the device-side exhaust pipe, and the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the device-side exhaust pipe is drained. It is connected so as to be water-sealed by drain water flowing into the water reservoir.

According to the connection adapter, when the first exhaust pipe is fitted onto the instrument-side exhaust pipe, the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the instrument-side exhaust pipe forms the drain water reservoir. Since it is water-sealed by the inflowing drain water, even if the inner peripheral surface of the first exhaust pipe and the outer peripheral surface of the instrument-side exhaust pipe are not completely sealed, the backflow of the combustion exhaust from the collective exhaust pipe is prevented. can be prevented.

Preferably, in the connection adapter,
The instrument-side exhaust section has an instrument-side air supply pipe provided so as to surround the outer periphery of the drain water recovery section,
The connection adapter is provided so as to surround the outer periphery of the second exhaust pipe, and has an air supply pipe connected to the instrument side air supply pipe on the lower end side,
The air supply pipe has an air supply section for introducing outside air.

According to the above-described connection adapter, a double-pipe closed forced-exhaust combustion device can be suitably used as a combustion device of a composite combustion device.

Preferably, the connection adapter has an opening area variable part capable of changing the opening area of the air supply part.

According to the connection adapter, the amount of air introduced into the combustion device can be changed according to the passage resistance and specifications of the combustion device. It can be used more suitably as a combustion device of a combustion device.

As described above, according to the present invention, even if drain water generated in the collective exhaust pipe flows into the connection adapter, it is possible to prevent combustion exhaust gas from flowing back from the collective exhaust pipe to the combustion device whose combustion is stopped. In addition, combustion exhaust gas can be smoothly discharged from the combustion device during combustion operation to the collective exhaust stack.

FIG. 1 is a schematic configuration diagram of an example of a combined combustion apparatus according to an embodiment of the present invention. FIG. 2 is a schematic perspective view showing an example of a combustion device according to an embodiment of the invention. FIG. 3 is a schematic vertical cross-sectional perspective view showing an appliance-side exhaust section and a connection adapter of the combustion apparatus according to the embodiment of the present invention. FIG. 4 is a schematic diagram schematically showing a connection state between the appliance-side exhaust section and the connection adapter of the combustion apparatus according to the embodiment of the present invention. FIG. 5 is a schematic perspective view showing another example of the connection adapter according to the embodiment of the invention.

A composite combustion apparatus and a connection adapter used therein according to embodiments of the present invention will be described below.
FIG. 1 is a schematic configuration diagram showing an example of a composite combustion apparatus according to this embodiment, and FIG. 2 is a schematic perspective view showing an example of one combustion apparatus. As shown in FIG. 1, the composite combustion apparatus includes a plurality of combustion devices 2, which are, for example, closed forced exhaust water heaters, and a collective exhaust stack 10 connecting the combustion devices 2. As shown in FIG. In the present embodiment, since combustion devices 2 having the same configuration are used, one combustion device 2 will be described as an example, and the same reference numerals will be used to describe the same configurations. is omitted.

As shown in FIG. 2, the combustion device 2 includes an exterior casing 200 having a generally rectangular box-shaped casing body 201 having a front opening (not shown) and a cover 202 closing the front opening of the casing body 201. , and the instrument body 20 is accommodated in the casing body 201 .

The instrument body 20 is formed in a substantially closed structure. Inside the appliance body 20, from the top, there are, in order from the top, an air supply collecting portion 11, an exhaust collecting portion 12, a heat exchange chamber 13 containing a heat exchanger 3, and a combustion chamber 14 containing a burner unit 4. are arranged. A combustion fan 15 is arranged below the instrument body 20 . The supply air collecting portion 11 is formed so as to cover the exhaust collecting portion 12 from above.

A body exhaust port 12a through which combustion exhaust is discharged from the instrument body 20 is open at the upper portion of the exhaust collecting portion 12 . A main body air supply port 11a through which combustion air is introduced from the outside opens so as to surround the outer periphery of the main body exhaust port 12a. The main body exhaust port 12a and the main body air supply port 11a are connected to the later-described instrument side exhaust portion 5 in an inner/outer double pipe system. The instrument side exhaust part 5 connected to the upper part of the instrument body 20 penetrates an insertion hole provided in the upper plate of the casing body 201 and protrudes upward. The instrument-side exhaust section 5 is connected to the collective exhaust pipe 10 via a connection adapter 7, which will be described later.

A plurality of gas burners 40 are arranged side by side in the burner unit 4 . Each gas burner 40 communicates with a gas manifold segmented corresponding to a combustion zone.

Three branch gas pipes connected to manifolds of the burner unit 4 are branched from a main gas pipe 47 for supplying fuel gas to the burner unit 4 of the combustion device 2 . Each branch gas pipe is provided with a switching solenoid valve 43 . An igniter and a thermocouple (not shown) are arranged near the gas burner 40 .

The air supply collecting portion 11 and the combustion fan 15 are connected by an air supply duct 16 . When the combustion fan 15 is operated, external air is drawn into the air supply collecting portion 11 through the main body air supply port 11a, and is supplied to the combustion fan 15 through the air supply duct 16. It is supplied to the burner unit 4 as combustion air. After the heat is recovered by the heat exchanger 3 , the combustion exhaust is discharged to the collective exhaust pipe 10 through the main body exhaust port 12 a that opens to the upper part of the exhaust collecting portion 12 .

The heat exchanger 3 has a heat absorption tube and a plurality of fins arranged so as to intersect the heat absorption tube. The heat absorption pipe is connected to the water supply pipe 31 on the inlet side and connected to the hot water discharge pipe 32 on the outlet side. Water flowing through the heat absorption pipe is heated by heat recovery, and the heated hot water is supplied to a hot water supply destination (not shown).

FIG. 3 is a schematic vertical cross-sectional perspective view showing the instrument side exhaust section 5 and the connection adapter 7, and FIG. 4 is a schematic diagram showing the connection state thereof. A part of the configuration is omitted in FIG. 4 to avoid complication. As shown in FIGS. 3 and 4, the instrument-side exhaust section 5 connected to the instrument body 20 is provided so as to surround the instrument-side exhaust pipe 50 and the instrument-side exhaust pipe 50 in order from the inside. It has a drain water recovery section 55 and an instrument side air supply pipe 60 provided so as to surround the outer periphery of the drain water recovery section 55 . These piping members are formed, for example, by drawing a metal plate such as stainless steel into a predetermined shape.

The instrument-side exhaust pipe 50 is opened vertically. The instrument-side exhaust pipe 50 includes, in order from the bottom, a lower large-diameter cylindrical portion 51, an upwardly and inwardly inclined portion 52 following the large-diameter cylindrical portion 51, and an upper small-diameter cylindrical portion 53 following the inclined portion 52. have Although not shown, the instrument-side exhaust pipe 50 communicates with the main body exhaust port 12a on the lower end side.

The drain water recovery unit 55 includes a drain water recovery pipe 56 extending upward from the outer peripheral surface of the large-diameter cylindrical portion 51 of the instrument-side exhaust pipe 50 above the small-diameter cylindrical portion 53 , and a device-side supply from the peripheral surface of the drain water recovery pipe 56 . and a drain water discharge pipe (drain water discharge portion) 57 that penetrates the trachea 60 and extends radially outward to the outside of the instrument-side exhaust portion 5 . The large-diameter cylindrical portion 51 of the instrument-side exhaust pipe 50 is fitted in the drain water recovery pipe 56 . The lower end of the drain water recovery pipe 56 extends below the lower end of the instrument-side exhaust pipe 50, and is connected to a connecting pipe (not shown) extending upward from the main body exhaust port 12a on the lower end side. The drain water recovery pipe 56 has an inner diameter larger than the outer diameter of the small-diameter cylindrical portion 53 of the instrument-side exhaust pipe 50 . The inner peripheral surface of the drain water recovery pipe 56 and the outer peripheral surface of the large-diameter cylindrical portion 51 of the instrument-side exhaust pipe 50 are connected by drawing or the like. The gap with the drain recovery pipe 56 is closed. The drain water collection part 55 is opened upward. Therefore, between the small-diameter cylindrical portion 53 of the instrument-side exhaust pipe 50 and the drain water recovery pipe 56, an upwardly open annular space is formed. An annular concave groove is formed in the inner peripheral surface of the upper end peripheral edge of the drain water recovery pipe 56 to accommodate the O-ring S1.

The drain water discharge pipe 57 is integrally connected with the drain water recovery pipe 56 . The drain water discharge pipe 57 has an inner opening end portion 58 that opens to the peripheral surface of the drain water recovery pipe 56, and the lower end of the end portion 58 is above the connecting portion between the instrument side exhaust pipe 50 and the drain water recovery pipe 56. , facing the inclined portion 52 between the large-diameter cylindrical portion 51 and the small-diameter cylindrical portion 53, and the upper end of the inner opening end portion 58 facing the outer peripheral surface of the small-diameter cylindrical portion 53. 56. Although not shown, the drain water discharge pipe 57 has an open end on the outer side connected to a discharge pipe connected to a drainage groove. Therefore, when drain water flows into the drain water recovery portion 55, the drain water is stored between the lower end of the drain water recovery pipe 56 and the lower end of the inner opening end portion 58 of the drain water discharge pipe 57. When the amount of drain water flowing into the water collecting portion 55 increases, the drain water is discharged from the drain water discharge pipe 57 to the outside. Therefore, in the present embodiment, an annular recess between the lower end of the drain water recovery pipe 56 connected to the outer peripheral surface of the instrument-side exhaust pipe 50 and the lower end of the inner opening end 58 of the drain water discharge pipe 57 . constitutes the drain water reservoir 63 .

The instrument-side air supply pipe 60 is opened vertically. The lower end of the instrument-side air supply pipe 60 is located above the lower end of the drain water recovery pipe 56 . The instrument side air supply pipe 60 is connected to the main body air supply port 11a on the lower end side. The drain water recovery pipe 56 and the instrument side air supply pipe 60 are fixedly connected by belt-like joint members 65 joined to predetermined positions on the outer peripheral surface of the drain water recovery pipe 56 and the inner peripheral surface of the instrument side exhaust pipe 50. there is A connection flange portion 64 that is bent outward and extends horizontally is formed at the lower end of the instrument-side air supply pipe 60 . The connection flange portion 64 is joined to the upper part of the periphery of the main body air supply port 11 a of the air supply collective portion 11 .

The connection adapter 7 includes, in order from the inside, a first exhaust pipe 70, a second exhaust pipe 80 provided so as to surround the outer periphery of the first exhaust pipe 70, and a second exhaust pipe 80 provided so as to surround the outer periphery of the second exhaust pipe 80. and an air supply pipe 90 . These piping members are formed, for example, by drawing a metal plate such as stainless steel into a predetermined shape.

The first exhaust pipe 70 opens downward. The first exhaust pipe 70 has a cylindrical portion 71 and a flange portion 72 that expands outward from the lower end of the cylindrical portion 71 . The cylindrical portion 71 has an inner diameter slightly larger than the outer diameter of the small-diameter cylindrical portion 53 of the instrument-side exhaust pipe 50 so that the cylindrical portion 71 fits onto the instrument-side exhaust pipe 50 . Therefore, when the first exhaust pipe 70 and the instrument-side exhaust pipe 50 are connected, the first exhaust pipe 70 and the instrument-side exhaust pipe 50 communicate with each other. The flange portion 72 is arranged so that when the first exhaust pipe 70 and the instrument-side exhaust pipe 50 are connected, the inner peripheral surface of the flange portion 72 substantially contacts the outer peripheral surface of the inclined portion 52 of the instrument-side exhaust pipe 50 . is formed in Further, when the first exhaust pipe 70 and the instrument-side exhaust pipe 50 are connected, the first exhaust pipe 70 (that is, the lower end of the flange portion 72) is connected to the previously described drain water collecting pipe. It is formed so as to be located below the lower end of the inner side opening end portion 58 of the drain water discharge pipe 57 that opens to the peripheral surface of the drain water discharge pipe 56 .

At the upper end side opening of the first exhaust pipe 70, there is a check valve 75 that is opened by the combustion exhaust discharged from the instrument body 20 during the combustion operation of the combustion device 2 and closed by its own weight during the stop of combustion. is provided. A support portion 76 that rotatably supports the check valve 75 is provided between the first exhaust pipe 70 and the second exhaust pipe 80 outside the check valve 75 . Therefore, when combustion exhaust is discharged from the device body 20 and the check valve 75 is opened, the first exhaust pipe 70 and the second exhaust pipe 80 form an exhaust passage.

The second exhaust pipe 80 includes a lower second exhaust pipe 81 connected to the drain water recovery pipe 56 of the instrument side exhaust section 5 on the lower end side, and an upper second exhaust pipe 85 connected to the collective exhaust pipe 10 on the upper end side. is divided into The lower second exhaust pipe 81 and the upper second exhaust pipe 85 are integrally connected by welding or the like. Note that the second exhaust pipe 80 may be composed of one pipe.

The lower second exhaust pipe 81 is opened vertically. The lower second exhaust pipe 81 has a lower small-diameter cylindrical portion 82 , an upwardly inclined inclined portion 83 continuing from the small-diameter cylindrical portion 82 , and an upper large-diameter cylindrical portion 84 continuing from the inclined portion 83 . The small-diameter cylindrical portion 82 of the lower second exhaust pipe 81 has an inner diameter larger than the outer diameter of the first exhaust pipe 70 . Therefore, a gap having a constant width is formed between the first exhaust pipe 70 and the lower second exhaust pipe 81 . The lower second exhaust pipe 81 is formed so that its lower end is located above the lower end of the first exhaust pipe 70 and its upper end is located above the upper end of the first exhaust pipe 70 . When the lower second exhaust pipe 81 is connected to the drain water recovery pipe 56, the gap between the first exhaust pipe 70 and the lower second exhaust pipe 81 communicates with the drain water recovery portion 55 to drain the drain water. It functions as an introduction part that leads to the water recovery part 55 . The first exhaust pipe 70 and the lower second exhaust pipe 81 are fixedly connected by a strip-shaped joint member 89 joined to a predetermined position between the outer peripheral surface of the first exhaust pipe 70 and the inner peripheral surface of the second exhaust pipe 80. ing.

The upper second exhaust pipe 85 is open vertically. The upper second exhaust pipe 85 includes a lower large-diameter cylindrical portion 86 continuing from the large-diameter cylindrical portion 84 of the lower second exhaust pipe 81, an inclined portion 87 continuing from the large-diameter cylindrical portion 86 and inclined upward and inward, and an inclined and an upper small-diameter cylindrical portion 88 continuing from portion 87 . The large-diameter cylindrical portion 86 of the upper second exhaust pipe 85 has substantially the same inner diameter as the outer diameter of the large-diameter cylindrical portion 84 of the lower second exhaust pipe 81 . An annular recessed groove for accommodating the O-ring S2 is formed in the inner peripheral surface of the upper end peripheral edge of the upper second exhaust pipe 85 .

The air supply pipe 90 opens downward. The air supply pipe 90 has an inner diameter larger than the outer diameters of the large-diameter cylindrical portions 86 and 84 of the upper and lower second exhaust pipes 85 and 81 . Therefore, a gap having a constant width is formed between the upper and lower second exhaust pipes 85 and 81 and the air supply pipe 90 . In addition, the air supply pipe 90 has an outer diameter substantially the same as the inner diameter of the instrument side air supply pipe 60 already described. Therefore, when the air supply pipe 90 and the instrument side air supply pipe 60 are connected, the gap between the upper and lower second exhaust pipes 85 and 81 and the air supply pipe 90 becomes the gap between the drain water recovery pipe 56 and the instrument side air supply pipe 60. Communicate with the gap between. The lower end of the air supply pipe 90 is located above the lower end of the second exhaust pipe 80 (that is, the lower end of the lower second exhaust pipe 81), and the upper end of the air supply pipe 90 is positioned above the upper end of the second exhaust pipe 80 (that is, the upper second exhaust pipe). 85). An upper wall portion 91 that closes the gap between the air supply pipe 90 and the upper second exhaust pipe 85 is formed between the vicinity of the upper end portion of the air supply pipe 90 and the upper second exhaust pipe 85 . Alternatively, the air supply pipe 90 may be opened vertically without forming the upper wall portion 91 .

A large number of openings 92 are formed in the peripheral surface of the air supply pipe 90 . These openings 92 are formed to be positioned above the upper end of the instrument-side air supply pipe 60 when the air supply pipe 90 and the instrument-side air supply pipe 60 are connected. Therefore, these openings 92 form an air supply section into which external air is introduced by operating the combustion fan 15, and the gap between the upper and lower second exhaust pipes 85, 81 and the air supply pipe 90 is the air supply portion. Make up the airway.

The instrument-side exhaust part 5 and the connection adapter 7 are joined together so that the lower end of the air supply pipe 90 joins the drain water recovery pipe 56 and the instrument-side air supply pipe 60 when the air supply pipe 90 is pushed into the instrument-side air supply pipe 60. The downward movement of the connection adapter 7 is restricted by abutting on the upper end of the member 65, so that the connection adapter 7 is positioned vertically. Also, at this time, the flange portion 72 at the lower end of the first exhaust pipe 70 substantially contacts the inclined portion 52 of the instrument-side exhaust pipe 50 . In addition, the lower end of the second exhaust pipe 80 (that is, the lower end of the lower second exhaust pipe 81) is located above the upper end of the inner opening end portion 58 of the drain water discharge pipe 57 that opens on the peripheral surface of the drain water recovery pipe 56. is also located above.

The collective exhaust stack 10 communicates with the outdoors. The collective exhaust stack 10 has connecting pipes 10 a branching at positions corresponding to the respective combustion devices 2 . The connection pipe 10 a has an outer diameter that substantially matches the inner diameter of the small-diameter cylindrical portion 88 of the upper second exhaust pipe 85 . By connecting the connection pipe 10a and the connection adapter 7, the combustion exhaust gas from each combustion device 2 is discharged to the collective exhaust pipe 10, and is discharged to the outside through the collective exhaust pipe 10.

Next, the connection between the instrument-side exhaust part 5 and the connection adapter 7 and the connection between the connection adapter 7 and the connection pipe 10a of the collective exhaust pipe 10 will be described. The first exhaust pipe 70 is fitted to the instrument side exhaust pipe 50 , the lower second exhaust pipe 81 is internally fitted to the drain water recovery pipe 56 , and the air supply pipe 90 is internally fitted to the instrument side air supply pipe 60 . The connection adapter 7 is pushed into the side exhaust part 5 from above. As described above, since the inner diameter of the first exhaust pipe 70 is set to be substantially the same as the outer diameter of the instrument-side exhaust pipe 50, the first exhaust pipe 70 is pushed into the instrument-side exhaust pipe 50 while sliding. To go. Then, the first exhaust pipe 70 is pushed into the instrument side exhaust pipe 50 to the final position where the lower end of the air supply pipe 90 contacts the upper end of the joint member 65 connecting the drain water recovery pipe 56 and the instrument side air supply pipe 60 . At this time, as described above, the inner peripheral surface of the flange portion 72 at the lower end of the first exhaust pipe 70 substantially contacts the outer peripheral surface of the inclined portion 52 of the instrument-side exhaust pipe 50 . Therefore, on the lower end side of the first exhaust pipe 70, the outer peripheral surface of the instrument-side exhaust pipe 50 and the inner peripheral surface of the first exhaust pipe 70 are substantially in contact with each other, and the outer peripheral surface of the instrument-side exhaust pipe 50 and the first exhaust pipe 70 A metal seal is provided between the inner peripheral surface of the

In addition, since the O-ring S1 is fitted to the inner peripheral surface of the upper end peripheral edge of the drain water recovery pipe 56, the lower second exhaust pipe 81 is pushed into the drain water recovery pipe 56 while pressing the O-ring S1. will be lost. As a result, the inner peripheral surface of the drain water recovery pipe 56 and the outer peripheral surface of the lower second exhaust pipe 81 are airtightly and watertightly sealed at the lower end side of the second exhaust pipe 80 . At this time, as described above, the lower end of the second exhaust pipe 80 (that is, the lower end of the lower second exhaust pipe 81) is located on the inner side of the drain water discharge pipe 57 opening on the peripheral surface of the drain water recovery pipe 56. It is positioned above the upper end of the open end portion 58 .

When the connection adapter 7 is connected to the instrument-side exhaust section 5 as described above, the connection pipe 10 a is pushed into the upper second exhaust pipe 85 from above the connection adapter 7 . Since the O-ring S2 is fitted to the inner peripheral surface of the upper end peripheral edge of the upper second exhaust pipe 85, the connection pipe 10a is pushed into the upper second exhaust pipe 85 while pressing the O-ring S2. As a result, the inner peripheral surface of the upper second exhaust pipe 85 and the outer peripheral surface of the connecting pipe 10a are sealed airtight and watertight.

According to the present embodiment, as indicated by the thin dashed arrow in FIG. 4, the drain water D generated in the collective exhaust stack 10 flows into the second exhaust pipe 80 of the connection adapter 7 via the connecting pipe 10a. Then, the drain water D travels along the inner peripheral surface of the second exhaust pipe 80 surrounding the outer periphery of the first exhaust pipe 70 and is collected by the drain water collecting portion 55 provided in the instrument side exhaust portion 5 . Therefore, even if the drain water D flows into the connection adapter 7 , the drain water D does not hinder the opening and closing of the check valve 75 provided at the upper end side opening of the first exhaust pipe 70 . As a result, even if the combustion exhaust gas G flows back into the connection adapter 7 from the collective exhaust pipe 10, as indicated by the downward thick solid line arrow in FIG. can be prevented. Further, as indicated by the upward thick solid line arrow in FIG. 4, the combustion exhaust gas G can be smoothly discharged from the combustion device 2 during the combustion operation to the collective exhaust pipe 10 . In addition, since the instrument side air supply pipe 60 and the air supply pipe 90 of the instrument side exhaust section 5 of the double pipe system are communicated with each other, the air H can be smoothly introduced from the outside as indicated by the thick dashed arrow in FIG. can be done.

Drain water flowing down through the connection adapter 7 flows into a drain water reservoir 63 formed between the lower end of the drain water recovery pipe 56 and the lower end of the inner opening end 58 of the drain water discharge pipe 57. However, according to the present embodiment, the lower end of the flange portion 72 of the first exhaust pipe 70 is lower than the lower end of the inner opening end portion 58 of the drain water discharge pipe 57 that opens to the peripheral surface of the drain water recovery pipe 56 . , the lower end of the flange portion 72 of the first exhaust pipe 70 and the outer peripheral surface of the instrument-side exhaust pipe 50 when the first exhaust pipe 70 and the instrument-side exhaust pipe 50 are connected. The gap between is water-sealed by the drain water flowing into the drain water reservoir 63 . Therefore, even if the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the instrument-side exhaust pipe 50 are not completely sealed, backflow of the combustion exhaust from the collective exhaust pipe 10 can be prevented. . Also, even if more drain water than the capacity of the drain water storage part 63 flows into the drain water storage part 63, it is discharged to the outside from the drain water discharge pipe 57. The stored drain water does not hinder the opening and closing of the check valve 75 . Even before the drain water is stored up to the lower end of the first exhaust pipe 70, the inner peripheral surface of the flange portion 72 of the first exhaust pipe 70 is substantially in contact with the outer peripheral surface of the inclined portion 52 of the instrument-side exhaust pipe 50. Therefore, when drain water flows into the drain water reservoir 63, the drain water enters the gap between the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the instrument-side exhaust pipe 50 due to capillary action. The gap can be water-sealed. In addition, since the flange portion 72 of the first exhaust pipe 70 and the inclined portion 52 of the instrument-side exhaust pipe 50 are substantially in contact with each other on the inclined surfaces, the drain water is likely to be held in the gap. For this reason, if the gap between the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the instrument-side exhaust pipe 50 can be water-sealed with drain water, the lower end of the first exhaust pipe 70 will extend around the drain water recovery pipe 56. It may be arranged slightly above the lower end of the inner side opening end portion 58 of the drain water discharge pipe 57 that opens to the surface.

Further, according to the present embodiment, the second exhaust pipe 80 is connected to the drain water recovery pipe 56 so that the lower end side of the second exhaust pipe 80 fits inside the drain water recovery pipe 56, so that the drain water flows down from above. Even so, it is possible to prevent drain water from leaking outward from the drain water recovery pipe 56 . As a result, it is possible to reliably prevent drain water from entering the device main body 20 .

As described above, according to the present embodiment, even if drain water generated in the exhaust stack 10 flows into the connection adapter 7, the drain water prevents the check valve 75 from being obstructed from opening and closing. be able to. As a result, the combustion exhaust gas can be prevented from flowing back from the stacking exhaust stack 10 to the combustion device 2 whose combustion is stopped, and the combustion exhaust gas can be smoothly discharged from the combustion device 2 during combustion operation to the stacking exhaust stack 10. can be done.

FIG. 5 is a schematic perspective view showing another example of the connection adapter according to this embodiment. This connection adapter 7a has the same configuration as the above-described embodiment except that it has a shielding portion (opening area variable portion) 100 that can change the opening area of the air supply portion on the outer periphery of the air supply pipe 90. FIG. For this reason, the same reference numerals are used for the same configurations, and description thereof is omitted.

In the composite combustion system, the amount of combustion air supplied to the instrument main body 20 varies depending on the passage resistance of the exhaust manifold 10, the specifications of the combustion system 2, and the like. Therefore, by providing a shielding portion 100 capable of changing the opening area of the air supply portion on the outer periphery of the air supply pipe 90, the amount of air introduced can be arbitrarily changed, and appropriate combustion can be realized. can. Therefore, the double-tube closed forced air supply/exhaust combustion apparatus having the connection adapter 7a together with the instrument side exhaust section 5 can be suitably used for the composite combustion apparatus.

(Other embodiments)
(1) In the above embodiment, a forced intake/exhaust combustion system is used. However, the present invention may use a forced exhaust combustion system. In this case, the instrument-side exhaust section is composed of the instrument-side exhaust pipe and the drain water collection section, and the connection adapter is composed of the first exhaust pipe and the second exhaust pipe.

(2) In the above-described embodiment, a double-pipe forced-exhaust combustion apparatus is used. However, the present invention may use a forced air supply/exhaust combustion device in which the appliance side exhaust pipe and the appliance side air supply pipe are separately connected to the appliance body. In this case, the instrument side exhaust section is composed of the instrument side exhaust pipe and the drain water collection section, and the connection adapter is composed of the first exhaust pipe and the second exhaust pipe.

(3) In the above embodiment, a so-called flapper type check valve is used. However, the present invention may use a so-called float type check valve.

(4) In the above embodiment, the first exhaust pipe, the second exhaust pipe, and the air supply pipe are integrally connected. However, the present invention may use some or all of these pipes as independent pipes.

2 Combustion Device 5 Instrument Side Exhaust Part 7 Connection Adapter 10 Collective Exhaust Pipe 20 Instrument Body 50 Instrument Side Exhaust Pipe 55 Drain Water Recovery Part 60 Instrument Side Air Supply Pipe 70 First Exhaust Pipe 75 Check Valve 80 Second Exhaust Pipe 90 Air Supply Pipe

Claims (8)

a plurality of combustion devices separately provided with an instrument-side exhaust pipe through which combustion exhaust is discharged from the instrument body and an instrument-side exhaust part having a drain water recovery part provided so as to surround the outer periphery of the instrument-side exhaust pipe;
a collective exhaust pipe that collects and discharges the combustion exhaust discharged from the instrument-side exhaust pipe of each combustion device to the outside;
A composite combustion device comprising a connection adapter disposed between an instrument-side exhaust part of each combustion device and a collective exhaust stack,
The connection adapter
a first exhaust pipe connected to the instrument-side exhaust pipe on the lower end side;
a backflow prevention valve provided at the upper end side opening of the first exhaust pipe for preventing backflow of combustion exhaust gas from the collective exhaust pipe to the combustion device during combustion stop;
a second exhaust pipe that surrounds the outer periphery of the first exhaust pipe, is connected to the drain water collecting portion at the lower end, and is connected to the collective exhaust pipe at the upper end. The combined combustion device of claim 1, wherein
The drain water recovery unit has a drain water storage unit provided on the outer circumference of the instrument-side exhaust pipe, and a drain water discharge unit for discharging the drain water from the drain water storage unit to the outside,
The lower end of the first exhaust pipe is positioned below the lower end of the second exhaust pipe,
The device-side exhaust part and the connection adapter are configured such that the first exhaust pipe is fitted to the device-side exhaust pipe, and the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the device-side exhaust pipe is drained. A combined combustion device connected in a watertight manner by drain water entering a water reservoir. The combined combustion device according to claim 1 or 2,
The instrument-side exhaust section has an instrument-side air supply pipe provided so as to surround the outer periphery of the drain water recovery section,
The connection adapter is provided so as to surround the outer periphery of the second exhaust pipe, and has an air supply pipe connected to the instrument side air supply pipe on the lower end side,
The air supply pipe is a compound combustion device that has an air supply section that introduces external air. 4. The combined combustion device of claim 3, wherein
The connection adapter is a composite combustion device that has an opening area variable part that can change the opening area of the air supply part. a plurality of combustion devices separately provided with an instrument-side exhaust pipe through which combustion exhaust is discharged from the instrument body and an instrument-side exhaust part having a drain water collection part provided so as to surround the outer periphery of the instrument-side exhaust pipe; It is used in a combined combustion device having a collective exhaust pipe for collecting and discharging combustion exhaust emitted from the instrument side exhaust pipe of the device to the outside, and is arranged between the instrument side exhaust part of each combustion device and the collective exhaust pipe. a connection adapter provided,
a first exhaust pipe connected to the instrument-side exhaust pipe on the lower end side;
a backflow prevention valve provided at the upper end side opening of the first exhaust pipe for preventing backflow of combustion exhaust gas from the collective exhaust pipe to the combustion device during combustion stop;
a second exhaust pipe provided to surround the outer periphery of the first exhaust pipe, connected to the drain water recovery section at the lower end side, and connected to the collective exhaust pipe at the upper end side. The connection adapter according to claim 5,
The drain water recovery unit has a drain water storage unit provided on the outer circumference of the instrument-side exhaust pipe, and a drain water discharge unit for discharging the drain water from the drain water storage unit to the outside,
The lower end of the first exhaust pipe is positioned below the lower end of the second exhaust pipe,
The device-side exhaust part and the connection adapter are configured such that the first exhaust pipe is fitted to the device-side exhaust pipe, and the gap between the inner peripheral surface of the lower end of the first exhaust pipe and the outer peripheral surface of the device-side exhaust pipe is drained. A connection adapter connected so as to be water-sealed by drain water flowing into the water reservoir. The connection adapter according to claim 5 or 6,
The instrument-side exhaust section has an instrument-side air supply pipe provided so as to surround the outer periphery of the drain water recovery section,
The connection adapter is provided so as to surround the outer periphery of the second exhaust pipe, and has an air supply pipe connected to the instrument side air supply pipe on the lower end side,
The air supply pipe is a connection adapter that has an air supply part that introduces external air. The connection adapter according to claim 7 further comprises
A connection adapter having an opening area variable part that can change the opening area of the air supply part.

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