CN116324278A - Composite combustion device and connection adapter - Google Patents

Composite combustion device and connection adapter Download PDF

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Publication number
CN116324278A
CN116324278A CN202280006882.5A CN202280006882A CN116324278A CN 116324278 A CN116324278 A CN 116324278A CN 202280006882 A CN202280006882 A CN 202280006882A CN 116324278 A CN116324278 A CN 116324278A
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CN
China
Prior art keywords
exhaust pipe
appliance
pipe
combustion
condensed water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202280006882.5A
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Chinese (zh)
Inventor
岩崎拓也
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Rinnai Corp
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Rinnai Corp
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Publication date
Application filed by Rinnai Corp filed Critical Rinnai Corp
Publication of CN116324278A publication Critical patent/CN116324278A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/04—Joints; Connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/04—Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/12—Devices for fastening the top or terminal to chimney, shaft, or flue
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/14—Draining devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Details Of Fluid Heaters (AREA)
  • Chimneys And Flues (AREA)

Abstract

The present invention provides a connection adapter (7) arranged between an appliance side exhaust part (5) and an aggregate exhaust funnel (10) of each combustion device (2) of a composite combustion device (1), comprising: a first exhaust pipe (70) whose lower end side is connected to the appliance-side exhaust pipe (50); a backflow prevention valve (75) which is provided in the upper end opening of the first exhaust pipe (70) and prevents backflow of combustion exhaust gas from the collection exhaust pipe (10) to the device body (20) during the stop of combustion; and a second exhaust pipe (80) provided so as to surround the outer periphery of the first exhaust pipe (70), the lower end side of which is connected to the condensate recovery unit (55), and the upper end side of which is connected to the collection exhaust pipe (10).

Description

Composite combustion device and connection adapter
Technical Field
The present invention relates to a composite combustion apparatus and a connection adapter therefor. In particular, the present invention relates to an improvement in a connection adapter disposed between an appliance-side exhaust part and a collective exhaust pipe of each combustion apparatus.
Background
A composite combustion apparatus is provided with a plurality of combustion apparatuses each having a burner and a combustion fan, and the plurality of combustion apparatuses are connected by a collective exhaust pipe for discharging combustion exhaust gas discharged from each combustion apparatus to the outside. In such a complex combustion device, the number of operations of the combustion device is adjusted according to the load. Therefore, there is a possibility that the combustion exhaust gas flows back from the combustion device in the combustion operation to the combustion device in the combustion stop via the collection exhaust pipe. In order to prevent the backflow of the combustion exhaust gas as described above, a backflow prevention valve is provided in a connection adapter disposed between each combustion device and the collection exhaust pipe (for example, patent document 1).
However, in the above-described complex combustion device, when the combustion exhaust gas passes through the inside of the collection exhaust pipe, the temperature decreases, and water vapor contained in the combustion exhaust gas condenses to generate condensed water. The condensed water flows into the connection adapter along the inner surface of the collection exhaust funnel. When such condensed water is stored in the connection adapter, the opening and closing of the backflow prevention valve are hindered by the condensed water. As a result, there is a problem in that the passage resistance of the combustion exhaust gas increases or the backflow preventing function is lowered. Further, there are the following problems: in winter, when condensate water freezes in the connection adapter to disable the backflow prevention valve from opening, combustion exhaust gas cannot be discharged from the combustion device to the collection exhaust pipe.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication 2016-90208
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent backflow of combustion exhaust gas from a collection exhaust pipe to a combustion device in which combustion is stopped and to ensure smooth discharge of the combustion exhaust gas from the combustion device in combustion operation to the collection exhaust pipe even if condensed water generated in the collection exhaust pipe flows into a connection adapter.
According to an aspect of the present invention, there is provided a composite combustion apparatus including:
a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe;
a collective exhaust pipe that collects and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside; and
a connection adapter disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus,
the connection adapter has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
In addition, according to another aspect of the present invention, there is provided a connection adapter,
the connection adapter is provided to a complex combustion device having: a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe; and an aggregate exhaust pipe that aggregates and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside,
the connection adapter is disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus, and has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
According to the present invention, even if condensed water generated in the collection exhaust pipe flows into the connection adapter, the backflow of combustion exhaust gas from the collection exhaust pipe to the combustion device in which combustion is stopped can be prevented. Further, according to the present invention, the combustion exhaust gas can be smoothly discharged from the combustion device in the combustion operation to the collection exhaust pipe.
Drawings
Fig. 1 is a schematic configuration diagram showing an example of a complex combustion device according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view showing an example of a combustion apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic vertical cross-sectional perspective view showing an appliance side exhaust part and a connection adapter of the combustion apparatus according to the embodiment of the present invention.
Fig. 4 is a schematic view schematically showing a connection state between an appliance-side exhaust part and a connection adapter of a combustion apparatus according to an 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 present invention.
Detailed Description
The composite combustion apparatus according to the embodiment of the present invention and the connection adapter used for the same will be described below.
Fig. 1 is a schematic configuration diagram showing an example of a complex combustion device according to the present embodiment, and fig. 2 is a schematic perspective diagram showing an example of a complex combustion device. As shown in fig. 1, the complex combustion device includes, for example, a plurality of combustion devices 2, which are closed forced air-supplying and exhausting type water heaters, and an aggregate exhaust pipe 10 connecting the combustion devices 2. In the present embodiment, since the combustion apparatus 2 having the same structure is used, the description will be given by taking one combustion apparatus 2 as an example, and the same reference numerals are used for the same structures in other combustion apparatuses 2, and the description thereof will be omitted.
As shown in fig. 2, the combustion apparatus 2 has an outer case 200, and the outer case 200 has: a substantially rectangular box-shaped housing main body 201 having a front surface opening (not shown); and a cover 202 closing the front surface opening of the case main body 201. The housing main body 201 accommodates the instrument main body 20.
The instrument body 20 is formed in a substantially closed configuration. In the device main body 20, an air supply collecting portion 11, an air discharge collecting portion 12, a heat exchange chamber 13 accommodating the heat exchanger 3, and a combustion chamber 14 accommodating the burner unit 4 are arranged in this order from above. Further, a combustion fan 15 is disposed below the tool main body 20. The air supply collecting portion 11 is divided into the air discharge collecting portion 12 in the instrument main body 20 so as to cover the air discharge collecting portion 12 from above.
A main body exhaust port 12a through which combustion exhaust gas indicated by a thick solid arrow is discharged from the inside of the appliance main body 20 opens at an upper portion of the exhaust gas collecting portion 12. A main body air supply port 11a through which combustion air indicated by a thick dotted arrow is introduced from the outside is opened at an upper portion of the air supply collecting portion 11 so as to surround an outer periphery of the main body air outlet 12 a. An appliance-side exhaust part 5 of an internal and external double pipe system, which will be described later, is connected to the main body exhaust port 12a and the main body supply port 11 a. The instrument-side air discharge portion 5 connected to the upper portion of the instrument main body 20 protrudes upward so as to penetrate through an insertion opening provided in an upper plate of the housing main body 201. The appliance-side exhaust unit 5 is connected to the collection exhaust pipe 10 via a connection adapter 7 described later.
A plurality of gas burners 40 are arranged in a row in the burner unit 4. Each gas burner 40 communicates with a gas manifold divided in correspondence with the combustion region.
Three branched gas pipes are branched from the main gas pipe 47 that supplies fuel gas to the burner unit 4 of the combustion apparatus 2. Each branched gas pipe is connected to a gas manifold of the burner unit 4. A switching solenoid valve 43 is disposed in each branched gas pipe. Further, although not shown, an igniter or a thermocouple is disposed 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, air outside the combustion device 2 is sucked into the air supply collecting portion 11 through the main body air supply port 11 a. The sucked air is supplied to the combustion fan 15 via the air supply duct 16. The supplied air is supplied as combustion air to the burner unit 4. The combustion exhaust gas heat-recovered by the heat exchanger 3 is discharged to the collection exhaust pipe 10 through the main exhaust port 12a opened at the upper portion of the exhaust collection portion 12.
The heat exchanger 3 has a heat absorbing pipe and a plurality of fins arranged so as to intersect the heat absorbing pipe. The heat absorbing pipe is connected to a water supply pipe 31 on the inlet side and to a hot water discharge pipe 32 on the outlet side. The water flowing through the heat absorbing pipe is heated by heat recovery, and the heated hot water is supplied to a hot water supply end outside the drawing.
Fig. 3 is a schematic vertical sectional perspective view showing the appliance-side air outlet 5 and the connection adapter 7, and fig. 4 is a schematic diagram schematically showing the connection state thereof. In fig. 4, a part of the structure is omitted to avoid complication. As shown in fig. 3 and 4, the appliance-side exhaust part 5 connected to the appliance main body 20 includes, in order from the inside, an appliance-side exhaust pipe 50, a condensed water recovery part 55 provided so as to surround the outer periphery of the appliance-side exhaust pipe 50, and an appliance-side air supply pipe 60 provided so as to surround the outer periphery of the condensed water recovery part 55. These piping members are formed by drawing a metal plate such as stainless steel into a predetermined shape.
The tool side exhaust pipe 50 has an upper tool end side exhaust opening and a lower tool end side exhaust opening and is opened vertically. The tool-side exhaust pipe 50 includes, in order from below, a large-diameter cylindrical portion 51 below, an inclined portion 52 extending obliquely upward and inward from the upper end of the large-diameter cylindrical portion 51, and a small-diameter cylindrical portion 53 extending upward from the upper end of the inclined portion 52. Although not shown, the appliance side exhaust pipe 50 communicates with the main body exhaust port 12a at its lower end side.
The condensate recovery unit 55 includes a condensate recovery tube 56 and a condensate discharge tube (condensate discharge unit) 57, the condensate recovery tube 56 extending from the outer peripheral surface of the large diameter cylindrical portion 51 of the appliance side exhaust tube 50 to above the upper end of the small diameter cylindrical portion 53, and the condensate discharge tube 57 extending from the peripheral surface of the condensate recovery tube 56 through the appliance side air supply tube 60 and radially outward to the outside of the appliance side exhaust portion 5. The large diameter cylindrical portion 51 of the appliance side exhaust pipe 50 is fitted into the condensate recovery pipe 56. The lower end of the condensate recovery pipe 56 extends below the lower end of the appliance side exhaust pipe 50. Although not shown, the condensate recovery pipe 56 is connected to a connection pipe extending upward from the main body exhaust port 12a at the lower end side. The condensed water recovery tube 56 has an inner diameter on the upper end side that is larger than the outer diameter of the small-diameter cylindrical portion 53 of the appliance-side exhaust pipe 50. The inner peripheral surface of the condensate recovery tube 56 is connected to the outer peripheral surface of the large-diameter cylindrical portion 51 of the tool-side exhaust pipe 50 by drawing or the like. Therefore, the gap between the appliance side exhaust pipe 50 and the condensate recovery pipe 56 is closed at the lower end side of the appliance side exhaust pipe 50. The condensed water recovery unit 55 is opened upward. Therefore, an annular space that opens upward is formed between the small-diameter cylindrical portion 53 of the appliance-side exhaust pipe 50 and the condensate recovery pipe 56. An annular groove accommodating the O-ring S1 is formed in the inner peripheral surface of the upper end peripheral edge of the condensate recovery tube 56.
The condensed water drain pipe 57 is integrally connected to the condensed water recovery pipe 56. The condensed water drain pipe 57 is connected to the condensed water recovery pipe 56 in the following manner: the lower end of the inner opening end 58, which is open to the peripheral surface of the condensate recovery tube 56, is located above the connection portion between the appliance side exhaust pipe 50 and the condensate recovery tube 56, and faces the inclined portion 52 between the large diameter cylindrical portion 51 and the small diameter cylindrical portion 53. The condensate water discharge pipe 57 is connected to the condensate water recovery pipe 56 such that an upper end of the inner open end 58 faces the outer peripheral surface of the small diameter cylindrical portion 53. A drain pipe connected to the drain tank is connected to an outer open end of the condensate drain pipe 57, though not shown. Therefore, when the condensed water flows from the collection exhaust pipe 10 into the condensed water recovery portion 55, the condensed water is stored between the lower end of the condensed water recovery pipe 56 and the lower end of the inner side opening end portion 58 of the condensed water discharge pipe 57. When the condensed water flowing into the condensed water recovery unit 55 increases, the condensed water is discharged to the outside from the condensed water discharge pipe 57. Therefore, in the present embodiment, the annular recess between the connection portion of the outer peripheral surface of the appliance-side exhaust pipe 50 and the inner peripheral surface of the lower end side of the condensate recovery pipe 56 and the lower end of the inner side opening end portion 58 of the condensate drain pipe 57 constitutes the condensate storage portion 63.
The appliance-side air supply duct 60 has an appliance upper end side air supply opening and an appliance lower end side air supply opening and is opened up and down. The lower end of the appliance side air supply pipe 60 is located above the lower end of the condensate recovery pipe 56. The appliance side air supply pipe 60 is connected to the main body air supply port 11a at a lower end side. The condensate recovery tube 56 and the appliance-side air supply tube 60 are fixedly connected to each other by a band-shaped joint member 65 that is joined to each of predetermined positions on the outer peripheral surface of the condensate recovery tube 56 and the inner peripheral surface of the appliance-side air supply tube 60. A connection flange 64 is formed at the lower end of the appliance side air supply pipe 60, and is bent outward to extend horizontally. The connection flange portion 64 is engaged with an upper portion of a peripheral edge of the main body supply port 11a of the supply collecting portion 11.
The connection adapter 7 has, in order from the inside: the first exhaust pipe 70, the second exhaust pipe 80 provided so as to surround the outer periphery of the first exhaust pipe 70, and the air supply pipe 90 provided so as to surround the outer periphery of the second exhaust pipe 80. These piping members are formed by drawing a metal plate such as stainless steel into a predetermined shape.
The first exhaust pipe 70 has an upper end side opening and a lower end side opening. A backflow prevention valve described later is disposed in the upper end opening. Therefore, the first exhaust pipe 70 opens downward during the stop of combustion. The first exhaust pipe 70 has a cylindrical portion 71 and a flange portion 72 that expands outwardly 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 tool-side exhaust pipe 50 so that the cylindrical portion 71 is externally fitted to the tool-side exhaust pipe 50. When the first exhaust pipe 70 and the appliance side exhaust pipe 50 are connected, the first exhaust pipe 70 and the appliance side exhaust pipe 50 communicate with each other. The flange portion 72 is formed such that, when the first exhaust pipe 70 and the appliance side exhaust pipe 50 are connected, the inner peripheral surface of the flange portion 72 is substantially in contact with the outer peripheral surface of the inclined portion 52 of the appliance side exhaust pipe 50. Further, the first exhaust pipe 70 is formed such that, when the first exhaust pipe 70 and the appliance-side exhaust pipe 50 are connected, the lower end of the first exhaust pipe 70 (i.e., the lower end of the flange portion 72) is located below the lower end of the inner side opening end portion 58 of the condensate water discharge pipe 57 that opens at the peripheral surface of the condensate water recovery pipe 56 described above.
A backflow prevention valve 75 is provided in the upper end side opening of the first exhaust pipe 70, and the backflow prevention valve 75 is opened by the combustion exhaust gas discharged from the inside of the appliance main body 20 during the combustion operation of the combustion apparatus 2, and is closed by the self weight during the stop of the combustion. A support portion 76 for rotatably supporting the backflow prevention valve 75 is provided between the first exhaust pipe 70 and the second exhaust pipe 80 on the outer side in the radial direction of the backflow prevention valve 75. Therefore, when the combustion exhaust gas is discharged from the tool body 20 and the backflow prevention valve 75 is opened, the first exhaust pipe 70 and the second exhaust pipe 80 constitute an exhaust passage.
The second exhaust pipe 80 is divided into a lower second exhaust pipe 81 having a lower end connected to the condensate recovery pipe 56 of the appliance side exhaust unit 5 and an upper second exhaust pipe 85 having an upper end connected to the collection exhaust pipe 10. The lower second exhaust pipe 81 and the upper second exhaust pipe 85 are integrally connected by welding or the like. The second exhaust pipe 80 may be constituted by a single pipe.
The lower second exhaust pipe 81 opens up and down. The lower second exhaust pipe 81 has: a lower small diameter cylindrical portion 82, an inclined portion 83 extending obliquely upward and outward from an upper end of the small diameter cylindrical portion 82, and a large diameter cylindrical portion 84 extending upward from an upper end of 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 of a constant width is formed in the radial direction between the first exhaust pipe 70 and the lower second exhaust pipe 81. Further, the lower second exhaust pipe 81 is formed such that the lower end is located above the lower end of the first exhaust pipe 70 and the 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 condensate recovery pipe 56, the gap between the first exhaust pipe 70 and the lower second exhaust pipe 81 communicates with the condensate recovery unit 55, and functions as an introduction unit for guiding condensate to the condensate recovery unit 55. The first exhaust pipe 70 and the lower second exhaust pipe 81 are fixedly connected to each other by a band-shaped joint member 89 that is joined to each of predetermined positions on the outer peripheral surface of the first exhaust pipe 70 and the inner peripheral surface of the second exhaust pipe 80.
The upper second exhaust pipe 85 opens up and down. The upper second exhaust pipe 85 has: a lower large-diameter cylindrical portion 86 extending upward from the upper end of the large-diameter cylindrical portion 84 of the lower second exhaust pipe 81, an inclined portion 87 extending obliquely upward and inward from the upper end of the large-diameter cylindrical portion 86, and a small-diameter cylindrical portion 88 extending upward from the upper end of the inclined portion 87. The large diameter cylindrical portion 86 of the upper second exhaust pipe 85 has an inner diameter substantially identical to the outer diameter of the large diameter cylindrical portion 84 of the lower second exhaust pipe 81. An annular groove 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 has a lower end side air supply opening and opens downward. The air supply pipe 90 has an inner diameter larger than the outer diameters of the large diameter cylindrical portions 86, 84 of the upper and lower second exhaust pipes 85, 81. Accordingly, a gap of a constant width is formed in the radial direction between the upper and lower second exhaust pipes 85, 81 and the gas supply pipe 90. The air supply pipe 90 has an outer diameter substantially equal to the inner diameter of the appliance-side air supply pipe 60. Therefore, when the air supply pipe 90 and the appliance-side air supply pipe 60 are connected, the gap between the upper and lower second exhaust pipes 85, 81 and the air supply pipe 90 communicates with the gap between the condensate recovery pipe 56 and the appliance-side air supply pipe 60. The air supply pipe 90 is formed such that a lower end thereof is located above a lower end of the second exhaust pipe 80 (i.e., a lower end of the lower second exhaust pipe 81) and an upper end thereof is located below an upper end of the second exhaust pipe 80 (i.e., an upper end of the upper second exhaust pipe 85). An upper wall portion 91 that closes a gap between the upper end portion of the air supply pipe 90 and the upper second exhaust pipe 85 is formed between the upper end portion of the air supply pipe 90 and the upper second exhaust pipe 85. In addition, the upper wall portion 91 may not be formed, and the gas supply pipe 90 may be opened up and down.
A plurality of openings 92 are formed in the circumferential surface of the gas supply pipe 90. These openings 92 are formed so as to be located above the upper end of the appliance-side air supply tube 60 when the air supply tube 90 is connected to the appliance-side air supply tube 60. Accordingly, these openings 92 constitute an air supply portion through which external air is introduced by operating the combustion fan 15. Further, the gap between the upper and lower second exhaust pipes 85, 81 and the air supply pipe 90 constitutes an air supply passage.
The appliance-side exhaust part 5 and the connection adapter 7 are configured such that, when the air supply pipe 90 is pushed into the appliance-side air supply pipe 60, the lower end of the air supply pipe 90 abuts against the upper end of the joint member 65 joining the condensate recovery pipe 56 and the appliance-side air supply pipe 60, thereby restricting downward movement of the connection adapter 7 and positioning the connection adapter 7 in the vertical direction. At this time, the flange portion 72 at the lower end of the first exhaust pipe 70 is substantially in contact with the inclined portion 52 of the appliance-side exhaust pipe 50. Further, the lower end of the second exhaust pipe 80 (i.e., the lower end of the lower second exhaust pipe 81) is located above the upper end of the inner side open end 58 of the condensate water discharge pipe 57 that opens at the peripheral surface of the condensate water recovery pipe 56.
The collection exhaust pipe 10 communicates with the outside. The aggregate exhaust pipe 10 has a connection pipe 10a branched from the main pipe at a position corresponding to each combustion device 2. The connection pipe 10a has an outer diameter substantially identical to 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 aggregate exhaust pipe 10, and the combustion exhaust gas is discharged to the outside through the aggregate exhaust pipe 10.
Next, the connection between the tool-side exhaust unit 5 and the connection adapter 7 and the connection between the connection adapter 7 and the connection pipe 10a of the collection exhaust pipe 10 will be described. The connection adapter 7 is pushed into the appliance-side exhaust part 5 from above so that the first exhaust pipe 70 is fitted to the appliance-side exhaust pipe 50, the lower second exhaust pipe 81 is fitted to the condensate recovery pipe 56, and the air supply pipe 90 is fitted to the appliance-side air supply pipe 60. 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 appliance side exhaust pipe 50, the first exhaust pipe 70 is pushed downward while sliding on the appliance side exhaust pipe 50. The first exhaust pipe 70 is pushed toward the appliance-side exhaust pipe 50 to a final position where the lower end of the air supply pipe 90 abuts against the upper end of the joint member 65 connecting the condensate recovery pipe 56 and the appliance-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 is substantially in contact with the outer peripheral surface of the inclined portion 52 of the appliance-side exhaust pipe 50. Therefore, the outer peripheral surface of the tool-side exhaust pipe 50 is substantially in surface contact with the inner peripheral surface of the first exhaust pipe 70 on the lower end side of the first exhaust pipe 70, whereby a metal seal is formed between the outer peripheral surface of the tool-side exhaust pipe 50 and the inner peripheral surface of the first exhaust pipe 70.
Further, an O-ring S1 is fitted to the inner peripheral surface of the upper end periphery of the condensate recovery tube 56, and the lower second exhaust tube 81 is pushed into the condensate recovery tube 56 while pressing the O-ring S1. Thereby, an airtight and watertight seal is formed between the inner peripheral surface of the condensate recovery tube 56 and the outer peripheral surface of the lower second exhaust tube 81 at the lower end side of the second exhaust tube 80. At this time, as described above, the lower end of the second exhaust pipe 80 (i.e., the lower end of the lower second exhaust pipe 81) is located above the upper end of the inner open end 58 of the condensate water discharge pipe 57 that opens at the peripheral surface of the condensate water recovery pipe 56. Further, the backflow prevention valve 75 is located above the upper end of the condensate recovery unit 55.
As described above, after the connection adapter 7 is connected to the appliance-side exhaust unit 5, the connection pipe 10a is pushed into the 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 periphery 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. Thereby, an airtight and watertight seal is formed between the inner peripheral surface of the upper second exhaust pipe 85 and the outer peripheral surface of the connection pipe 10a.
According to the present embodiment, as shown by the thin broken line arrow in fig. 4, when the condensed water D generated in the collection exhaust pipe 10 flows into the second exhaust pipe 80 of the connection adapter 7 via the connection pipe 10a, the condensed water D is recovered by the condensed water recovery portion 55 provided in the appliance-side exhaust portion 5 along the inner peripheral surface of the second exhaust pipe 80 surrounding the outer periphery of the first exhaust pipe 70. Therefore, even if the condensed water D flows into the connection adapter 7, the opening and closing of the backflow prevention valve 75 provided in the upper end side opening portion of the first exhaust pipe 70 is not hindered by the condensed water D. Thus, as shown by the downward thick solid arrows in fig. 4, even if the combustion exhaust gas G flows back from the collection exhaust pipe 10 into the connection adapter 7, the combustion exhaust gas G can be prevented from flowing back from the collection exhaust pipe 10 to the combustion device 2 in which the combustion is stopped. Further, as shown by the upward thick solid arrows in fig. 4, the combustion exhaust gas G can be smoothly discharged from the combustion device 2 in the combustion operation to the collection exhaust funnel 10. Further, since the appliance-side air supply pipe 60 of the double-pipe type appliance-side air discharge portion 5 is communicated with the air supply pipe 90, the air H can be smoothly introduced into the appliance main body 20 from the outside as indicated by the thick dotted arrow in fig. 4.
The condensed water flowing down in the connection adapter 7 flows into the condensed water storage portion 63 formed between the lower end of the condensed water recovery tube 56 and the lower end of the inner open end 58 of the condensed water discharge tube 57. On the other hand, according to the present embodiment, the lower end of the flange portion 72 of the first exhaust pipe 70 is located below the lower end of the inner side opening end portion 58 of the condensate water discharge pipe 57 that opens at the peripheral surface of the condensate water recovery pipe 56. Therefore, when the first exhaust pipe 70 is connected to the appliance-side exhaust pipe 50, a gap between the inner peripheral surface of the lower end of the flange portion 72 of the first exhaust pipe 70 and the outer peripheral surface of the appliance-side exhaust pipe 50 is sealed by condensate water flowing into the condensate water storage portion 63. Therefore, even when a complete seal is not formed between the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the appliance-side exhaust pipe 50, backflow of the combustion exhaust gas from the collection exhaust pipe 10 can be prevented. Further, even if more condensate than the volume of the condensate storage portion 63 flows into the condensate storage portion 63, the condensate is discharged to the outside from the condensate discharge pipe 57. Therefore, the opening and closing of the backflow prevention valve 75 provided above the condensate water discharge pipe 57 is not hindered by the stored condensate water. Further, 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 appliance-side exhaust pipe 50. Therefore, even before the condensed water is stored in the lower end of the first exhaust pipe 70 in the condensed water storage portion 63, when the condensed water flows into the condensed water storage portion 63, the condensed water intrudes into a gap between the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the appliance-side exhaust pipe 50 due to capillary phenomenon, and the gap is sealed. Further, since the flange portion 72 of the first exhaust pipe 70 is substantially in contact with the inclined portion 52 of the appliance-side exhaust pipe 50 through the inclined surface, condensed water is easily held in the gap. Therefore, if the gap between the inner peripheral surface of the first exhaust pipe 70 and the outer peripheral surface of the appliance-side exhaust pipe 50 is sealed by the condensed water, the lower end of the first exhaust pipe 70 may be disposed slightly above the lower end of the inner side open end portion 58 of the condensed water discharge pipe 57 where the peripheral surface of the condensed water recovery pipe 56 is open.
Further, according to the present embodiment, the second exhaust pipe 80 is connected to the condensate recovery pipe 56 so as to be embedded in the condensate recovery pipe 56 at the lower end side. Therefore, even if the condensed water flows down from above, the condensed water can be prevented from leaking to the outside of the condensed water recovery pipe 56. This can reliably prevent the condensed water from entering the instrument main body 20.
As described above, according to the present embodiment, even if the condensed water generated in the collection/exhaust pipe 10 flows into the connection adapter 7, the condensed water can be prevented from interfering with the opening and closing of the backflow prevention valve 75. This prevents the combustion exhaust gas from flowing backward from the collection exhaust pipe 10 to the combustion device 2 in which the combustion is stopped. Further, the combustion exhaust gas can be smoothly discharged from the combustion device 2 in the combustion operation to the collection exhaust pipe 10.
Fig. 5 is a schematic perspective view showing another example of the connection adapter according to the present embodiment. The connection adapter 7a has the same configuration as the above embodiment except that it has a shielding portion (opening area variable portion) 100 capable of changing the opening area of the air supply portion on the outer periphery of the air supply pipe 90. Therefore, the same reference numerals are used for the same structures and the description is omitted.
In the complex combustion device, the amount of combustion air supplied into the device main body 20 varies depending on the passage impedance of the aggregate exhaust pipe 10, the design of the combustion device 2, and the like. Therefore, by providing the 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 into the instrument main body 20 can be arbitrarily changed, and appropriate combustion can be achieved. Therefore, the sealed forced air-supplying/exhausting burner of the double pipe system having the appliance-side exhaust part 5 and the connection adapter 7a can be preferably used for the complex burner.
(other embodiments)
(1) In the above embodiment, the forced air-supplying and exhausting type combustion apparatus is used. However, in the present invention, a forced-exhaust-type combustion apparatus may also be used. In this case, the appliance-side exhaust unit is configured by the appliance-side exhaust pipe and the condensed water collection unit, and the connection adapter is configured by the first exhaust pipe and the second exhaust pipe.
(2) In the above embodiment, the forced air supply and exhaust type combustion apparatus of the double pipe system is used. However, in the present invention, a forced air-supplying and air-exhausting type combustion apparatus in which an appliance-side exhaust pipe and an appliance-side air supply pipe are connected to an appliance main body, respectively, may be used. In this case, the appliance-side exhaust unit is configured by the appliance-side exhaust pipe and the condensed water collection unit, and the connection adapter is configured by the first exhaust pipe and the second exhaust pipe.
(3) In the above embodiment, a so-called baffle-type backflow prevention valve is used. However, in the present invention, a so-called float-type backflow preventing valve is used.
(4) In the above embodiment, the first exhaust pipe, the second exhaust pipe, and the air supply pipe are integrally connected. However, in the present invention, some or all of these pipes may be used as independent pipes.
The present invention has been described in detail above, and an outline of the present invention is as follows.
According to an aspect of the present invention, there is provided a composite combustion apparatus including:
a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe;
a collective exhaust pipe that collects and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside; and
a connection adapter disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus,
the connection adapter has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
According to the above-described complex combustion device, when the condensed water generated in the collection exhaust pipe flows into the connection adapter, the condensed water is collected along the inner peripheral surface of the second exhaust pipe surrounding the outer periphery of the first exhaust pipe to the condensed water collection portion provided in the appliance-side exhaust portion. Therefore, even if condensed water flows from the collection exhaust pipe into the connection adapter, the opening and closing of the backflow prevention valve provided in the upper end side opening portion of the first exhaust pipe is not hindered by the condensed water. This prevents the combustion exhaust gas from flowing backward from the collection exhaust pipe to the combustion device in which the combustion is stopped. Further, the combustion exhaust gas can be smoothly discharged from the combustion device in the combustion operation to the collection exhaust pipe.
Preferably, in the above-described complex combustion device,
the condensed water recovery unit of the appliance-side exhaust unit includes: a condensed water storage unit which is provided on the outer periphery of the appliance-side exhaust pipe and stores condensed water flowing in from the collection exhaust pipe; and a condensed water drain portion that drains the condensed water from the condensed water storage portion to the outside,
the lower end of the first exhaust pipe of the connection adapter is disposed below the lower end of the second exhaust pipe of the connection adapter,
the appliance-side exhaust portion and the connection adapter are connected in the following manner: the first exhaust pipe is externally fitted to the appliance-side exhaust pipe, and a gap between an inner peripheral surface of the lower end of the first exhaust pipe and an outer peripheral surface of the appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion.
According to the above-described complex combustion device, when the first exhaust pipe is externally fitted to the appliance-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 appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion. Therefore, even when a complete seal is not formed between the inner peripheral surface of the first exhaust pipe and the outer peripheral surface of the appliance-side exhaust pipe, the combustion exhaust gas can be prevented from flowing backward from the collection exhaust pipe to the combustion device.
Preferably, in the above-described complex combustion device,
the appliance-side exhaust part has an appliance-side air supply pipe provided so as to surround the outer periphery of the condensed water recovery part,
the connection adapter has an air supply pipe provided so as to surround the outer periphery of the second exhaust pipe and having a lower end side connected to the appliance-side air supply pipe,
the air supply pipe has an air supply portion for introducing external air into the appliance body.
According to the above-described complex combustion apparatus, a closed forced air-feed type combustion apparatus of a double pipe system can be preferably used as the combustion apparatus of the complex combustion apparatus.
Preferably, in the above-described complex combustion device,
the connection adapter has an opening area variable portion capable of changing an opening area of the gas supply portion of the gas supply pipe.
According to the above-described complex combustion device, the amount of air introduced into the combustion device can be changed according to the passage impedance, the design of the combustion device, or the like. Therefore, the double-pipe closed forced air-supplying and exhausting type combustion apparatus can be more preferably used as the combustion apparatus of the complex combustion apparatus.
Furthermore, according to another aspect of the present invention, there is provided a connection adapter,
the connection adapter is provided to a complex combustion device having: a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe; and an aggregate exhaust pipe that aggregates and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside,
the connection adapter is disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus, and has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
According to the connection adapter, when the condensed water generated in the collection exhaust pipe flows into the connection adapter, the condensed water is collected along the inner peripheral surface of the second exhaust pipe surrounding the outer periphery of the first exhaust pipe to the condensed water collection portion provided in the appliance-side exhaust portion. Therefore, even if condensed water flows from the collection exhaust pipe into the connection adapter, the opening and closing of the backflow prevention valve provided in the upper end side opening portion of the first exhaust pipe is not hindered by the condensed water. This prevents the combustion exhaust gas from flowing backward from the collection exhaust pipe to the combustion device in which the combustion is stopped. Further, the combustion exhaust gas can be smoothly discharged from the combustion device in the combustion operation to the collection exhaust pipe.
Preferably, in the above-mentioned connection adapter,
the condensed water recovery unit of the appliance-side exhaust unit includes: a condensed water storage unit which is provided on the outer periphery of the appliance-side exhaust pipe and stores condensed water flowing in from the collection exhaust pipe; and a condensed water drain portion that drains the condensed water from the condensed water storage portion to the outside,
the lower end of the first exhaust pipe of the connection adapter is disposed below the lower end of the second exhaust pipe of the connection adapter,
the appliance-side exhaust portion and the connection adapter are connected in the following manner: the first exhaust pipe is externally fitted to the appliance-side exhaust pipe, and a gap between an inner peripheral surface of the lower end of the first exhaust pipe and an outer peripheral surface of the appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion.
According to the above-described connection adapter, when the first exhaust pipe is externally fitted to the appliance-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 appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion. Therefore, even when a complete seal is not formed between the inner peripheral surface of the first exhaust pipe and the outer peripheral surface of the appliance-side exhaust pipe, the exhaust gas from the collection exhaust pipe can be prevented from flowing backward to the combustion device.
Preferably, in the above-mentioned connection adapter,
the appliance-side exhaust part has an appliance-side air supply pipe provided so as to surround the outer periphery of the condensed water recovery part,
the connection adapter has an air supply pipe provided so as to surround the outer periphery of the second exhaust pipe and having a lower end side connected to the appliance-side air supply pipe,
the air supply pipe has an air supply portion for introducing external air into the appliance body.
According to the above-described connection adapter, a double-pipe type closed forced air-feed type combustion apparatus can be preferably used as the combustion apparatus of the composite combustion apparatus.
Preferably, the connection adapter has an opening area variable portion capable of changing an opening area of the air supply portion of the air supply pipe.
According to the above-described connection adapter, the amount of air introduced into the combustion device can be changed according to the passage impedance, the design of the combustion device, or the like. This makes it possible to more preferably use a double-pipe closed forced air-feed/exhaust type combustion apparatus as the combustion apparatus of the complex combustion apparatus.
The present invention has been described above with reference to the present embodiment, but the present invention is not limited thereto. The structure or details of the present invention can be variously modified as will be understood by those skilled in the art within the scope of the present invention.
Industrial applicability
According to the present invention, it is possible to provide a complex combustion device capable of preventing backflow of combustion exhaust gas from the collection exhaust pipe to the combustion device in which combustion is stopped, and smoothly discharging the combustion exhaust gas from the combustion device in combustion operation to the collection exhaust pipe.

Claims (8)

1. A composite combustion apparatus, comprising:
a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe;
a collective exhaust pipe that collects and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside; and
a connection adapter disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus,
the connection adapter has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
2. A complex combustion device as set forth in claim 1, wherein,
the condensed water recovery unit of the appliance-side exhaust unit includes: a condensed water storage unit which is provided on the outer periphery of the appliance-side exhaust pipe and stores condensed water flowing in from the collection exhaust pipe; and a condensed water drain portion that drains the condensed water from the condensed water storage portion to the outside,
the lower end of the first exhaust pipe of the connection adapter is disposed below the lower end of the second exhaust pipe of the connection adapter,
the appliance-side exhaust portion and the connection adapter are connected in the following manner: the first exhaust pipe is externally fitted to the appliance-side exhaust pipe, and a gap between an inner peripheral surface of the lower end of the first exhaust pipe and an outer peripheral surface of the appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion.
3. A complex combustion device as set forth in claim 1 or 2, characterized in that,
the appliance-side exhaust part has an appliance-side air supply pipe provided so as to surround the outer periphery of the condensed water recovery part,
the connection adapter has an air supply pipe provided so as to surround the outer periphery of the second exhaust pipe and having a lower end side connected to the appliance-side air supply pipe,
the air supply pipe has an air supply portion for introducing external air into the appliance body.
4. A complex combustion device as set forth in claim 3, wherein,
the connection adapter has an opening area variable portion capable of changing an opening area of the gas supply portion of the gas supply pipe.
5. A connection adapter, the connection adapter being provided to a complex combustion device, the complex combustion device having:
a plurality of combustion devices each including an appliance-side exhaust unit having an appliance-side exhaust pipe through which combustion exhaust gas is discharged from an appliance main body, and a condensed water recovery unit provided so as to surround an outer periphery of the appliance-side exhaust pipe; and an aggregate exhaust pipe that aggregates and discharges the combustion exhaust gas discharged from the appliance-side exhaust pipe of each combustion apparatus to the outside,
the connection adapter is disposed between the appliance-side exhaust part and the collection exhaust pipe of each combustion apparatus, and has:
a first exhaust pipe, the lower end side of which is connected to the appliance-side exhaust pipe;
a backflow prevention valve provided in an upper end side opening portion of the first exhaust pipe, and configured to prevent backflow of the combustion exhaust gas from the collection exhaust pipe to each combustion device in a state where combustion is stopped; and
and a second exhaust pipe provided so as to surround the outer periphery of the first exhaust pipe, the second exhaust pipe having a lower end connected to the condensed water recovery unit and an upper end connected to the collection exhaust pipe.
6. The connection adapter of claim 5 wherein the connector comprises a connector,
the condensed water recovery unit of the appliance-side exhaust unit includes: a condensed water storage unit which is provided on the outer periphery of the appliance-side exhaust pipe and stores condensed water flowing in from the collection exhaust pipe; and a condensed water drain portion that drains the condensed water from the condensed water storage portion to the outside,
the lower end of the first exhaust pipe of the connection adapter is disposed below the lower end of the second exhaust pipe of the connection adapter,
the appliance-side exhaust portion and the connection adapter are connected in the following manner: the first exhaust pipe is externally fitted to the appliance-side exhaust pipe, and a gap between an inner peripheral surface of the lower end of the first exhaust pipe and an outer peripheral surface of the appliance-side exhaust pipe is sealed by the condensate water flowing into the condensate water storage portion.
7. The connection adapter according to claim 5 or 6, characterized in that,
the appliance-side exhaust part has an appliance-side air supply pipe provided so as to surround the outer periphery of the condensed water recovery part,
the connection adapter has an air supply pipe provided so as to surround the outer periphery of the second exhaust pipe and having a lower end side connected to the appliance-side air supply pipe,
the air supply pipe has an air supply portion for introducing external air into the appliance body.
8. The connection adapter of claim 7 wherein the connector comprises a connector,
the air supply pipe is provided with an opening area variable part capable of changing the opening area of the air supply part.
CN202280006882.5A 2021-04-05 2022-03-28 Composite combustion device and connection adapter Pending CN116324278A (en)

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JP2021063892A JP2022159609A (en) 2021-04-05 2021-04-05 Compound combustion device and connection adapter
PCT/JP2022/014778 WO2022215565A1 (en) 2021-04-05 2022-03-28 Combined combustion device and connection adapter

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CN (1) CN116324278A (en)
AU (1) AU2022254891A1 (en)
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JPS5347630Y2 (en) * 1973-12-26 1978-11-15
JPS56165231U (en) * 1980-05-09 1981-12-08
CA1264622A (en) * 1984-08-09 1990-01-23 State Industries, Inc. Water heater construction and method of heating water
US7818928B2 (en) * 2005-03-08 2010-10-26 Flexmaster Canada Ltd. Conduit drain
KR101536656B1 (en) * 2013-12-05 2015-07-14 주식회사 경동나비엔 Backflow prevention device for common exhaust pipe and combustion device having the backfolw prevention device

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