US20160053994A1 - Exhaust structure for combustion apparatus - Google Patents
Exhaust structure for combustion apparatus Download PDFInfo
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- US20160053994A1 US20160053994A1 US14/466,423 US201414466423A US2016053994A1 US 20160053994 A1 US20160053994 A1 US 20160053994A1 US 201414466423 A US201414466423 A US 201414466423A US 2016053994 A1 US2016053994 A1 US 2016053994A1
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- Prior art keywords
- exhaust
- pipe
- combustion apparatus
- exhaust tube
- fixing portion
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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
- F23J13/02—Linings; Jackets; Casings
- F23J13/025—Linings; Jackets; Casings composed of concentric elements, e.g. double walled
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
Abstract
An exhaust structure for a combustion apparatus includes a combustion apparatus, an exhaust tube, an exhaust pipe, an exhaust adapter, and a fixing member. The exhaust tube is connected to the combustion apparatus at the one end portion. A part of the exhaust tube on a side of the other end portion is inserted into the exhaust pipe. The exhaust adapter has an annular shape surrounding a through hole, and is attached to an outer circumferential surface of the exhaust tube and to an inner circumferential surface of the exhaust pipe by inserting the exhaust tube into the through hole. The fixing member is formed of an elastic body, attached to the exhaust pipe at a position close to the combustion apparatus relative to the exhaust adapter, and fixes the exhaust tube to the exhaust pipe while being attached to the outer circumferential surface of the exhaust tube.
Description
- 1. Field of the Invention
- The present invention relates to an exhaust structure for a combustion apparatus.
- 2. Description of the Background Art
- A combustion apparatus, for example, a heating apparatus, has a main body that is placed inside of a building such that an exhaust is emitted through an exhaust pipe (a B vent) to the outside of the building. There are locations where an already-placed exhaust pipe cannot be removed, from a point of view of maintaining appearance of buildings, when this already-placed combustion apparatus should be replaced with a new combustion apparatus.
- At such a location, a new exhaust tube (a flexible exhaust tube) is inserted into the already-placed exhaust pipe without removing this already-placed exhaust pipe, so that a combustion apparatus can be replaced. However, if the exhaust tube has a relatively large outer diameter, this exhaust tube cannot be placed inside the exhaust pipe. Accordingly, an exhaust tube decreased in diameter needs to be used.
- Furthermore, an exhaust tube inserted into the already-placed exhaust pipe needs to be fixed. In general, a grommet is used as a component for fixing a tube. For example, a grommet is disclosed in Japanese Patent Laying-Open Nos. 2002-152949 and 10-92243.
- In the case where a new exhaust tube is inserted into the already-placed exhaust pipe from the inside of a building, the exhaust tube should be fixed while being inserted into the exhaust pipe; otherwise, there may be a problem that the exhaust tube falls from inside of the exhaust pipe into inside of the building.
- The present invention has been made in light of the above-described problems. An object of the present invention is to provide an exhaust structure for a combustion apparatus, by which falling of an exhaust tube inserted into an exhaust pipe can be prevented.
- An exhaust structure for combustion apparatus according to the present invention includes a combustion apparatus, an exhaust tube, an exhaust pipe, an exhaust adapter, and a fixing member. The exhaust tube has one end portion and the other end portion, and is connected to the combustion apparatus at the one end portion. A part of the exhaust tube on a side of the other end portion is inserted into the exhaust pipe. The exhaust adapter has an annular shape surrounding a through hole, and is attached to an outer circumferential surface of the exhaust tube and to an inner circumferential surface of the exhaust pipe by inserting the exhaust tube into the through hole. The fixing member is formed of an elastic body, is attached to the exhaust pipe at a position close to the combustion apparatus relative to the exhaust adapter, and fixes the exhaust tube to the exhaust pipe while being attached to the outer circumferential surface of the exhaust tube.
- According to the exhaust structure for combustion apparatus of the present invention, the fixing member fixes the exhaust tube to the exhaust pipe in the state where the fixing member is attached to the exhaust pipe and also attached to the outer circumferential surface of the exhaust tube. Accordingly, the fixing member can prevent falling of the exhaust tube inserted into the exhaust pipe.
- Furthermore, the fixing member is attached to the exhaust pipe at a position close to the combustion apparatus relative to the exhaust adapter. Accordingly, even before attaching the exhaust adapter, the fixing member can prevent falling of the exhaust tube inserted into the exhaust pipe.
- In the exhaust structure for combustion apparatus described above, the fixing member includes a first fixing portion attached to the exhaust tube; a second fixing portion attached to the exhaust pipe; and a main body portion connecting the first fixing portion and the second fixing portion. The main body portion has a communication hole that allows communication between a first region and a second region separated from the first region by the main body portion. The first region is located between the outer circumferential surface of the exhaust tube and the inner circumferential surface of the exhaust pipe. Accordingly, when an exhaust leaks to the first region due to damage of the exhaust tube or the like, the exhaust can be emitted from the first region to the second region through the communication hole.
- In the exhaust structure for combustion apparatus described above, the first fixing portion and the second fixing portion each have a cylindrical shape and are concentrically arranged. Accordingly, when the exhaust tube is inserted into the exhaust pipe, the outer circumferential surface of the exhaust tube is less likely to come into contact with the inner circumferential surface of the exhaust pipe. Consequently, the exhaust tube can be readily inserted into the exhaust pipe.
- The exhaust structure for combustion apparatus described above further includes a connection pipe connected to the fixing member and the combustion apparatus, and into which a part of the exhaust tube on a side of the one end portion is inserted. The second region is provided between the outer circumferential surface of the exhaust tube and an inner circumferential surface of the connection pipe. The combustion apparatus includes a housing having an internal space. The housing has a connection hole that allows communication between the internal space and the second region. Accordingly, the exhaust tube can be protected by the connection pipe. Furthermore, when an exhaust leaks to the first region due to damage of the exhaust tube and the like, the exhaust can be emitted from the first region through the communication hole to the second region provided between the outer circumferential surface of the exhaust tube and the inner circumferential surface of the connection pipe. Furthermore, the exhaust can be emitted from the second region to the internal space through the connection hole. Accordingly, the exhaust can be prevented from leaking into a room.
- In the exhaust structure for combustion apparatus described above, the combustion apparatus is a water heater adapted to an exhaust suction and combustion system. The water heater adapted to the exhaust suction and combustion system can maintain the stabilized combustion state even when the exhaust tube is decreased in diameter.
- The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
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FIG. 1 is a diagram schematically showing the state where an exhaust structure for combustion apparatus in one embodiment of the present invention is placed in a building. -
FIG. 2 is a partially cutaway perspective view showing, in an enlarged manner, a region II inFIG. 1 . -
FIG. 3 is a cross-sectional view showing, in an enlarged manner, a region III inFIG. 1 . -
FIG. 4 is a perspective view schematically showing the configuration of a fixing member included in the exhaust structure for combustion apparatus in one embodiment of the present invention. -
FIG. 5 is a cross-sectional view schematically showing the configuration of a modification of the fixing member included in the exhaust structure for combustion apparatus in one embodiment of the present invention. -
FIG. 6 is a cross-sectional view showing, in an enlarged manner, a region VI inFIG. 1 . -
FIG. 7 is a front view schematically showing the configuration of a water heater as an example of a combustion apparatus included in the exhaust structure for combustion apparatus in one embodiment of the present invention. -
FIG. 8 is a partial cross-sectional side view schematically showing the configuration of the water heater shown inFIG. 7 . - Embodiments of the present invention will be hereinafter described with reference to the drawings.
- An exhaust structure for a combustion apparatus in one embodiment of the present invention will be first described.
- Referring to
FIG. 1 , an exhaust structure forcombustion apparatus 100 in the present embodiment mainly has acombustion apparatus 1, anexhaust tube 20, anexhaust pipe 30, anexhaust adapter 40, afixing member 50, aconnection pipe 60, and an exhaust terminal (a rain cap) 70. This exhaust structure forcombustion apparatus 100 serves to emit combustion gas produced incombustion apparatus 1 to the outside of abuilding 200. -
Combustion apparatus 1 is placed insidebuilding 200. Thiscombustion apparatus 1 serves as a water heater that heats warm water and water, for example, with combustion gas, and may be a heating apparatus or the like that warms up the inside of the building with combustion gas. Furthermore, in the case where a water heater is used ascombustion apparatus 1, this water heater may be, for example, a water heater adapted to an exhaust suction and combustion system. This water heater may also be a water heater of a latent heat recovery type. - Referring to
FIGS. 1 and 2 ,exhaust tube 20 has oneend portion 20 a and theother end portion 20 b.Exhaust tube 20 is connected tocombustion apparatus 1 at oneend portion 20 a. Theother end portion 20 b ofexhaust tube 20 extends to the outside of the building. The inside ofexhaust tube 20 is defined as an emission path for the combustion gas emitted fromcombustion apparatus 1. Thus, the combustion gas produced incombustion apparatus 1 can be guided to the outside of the building throughexhaust tube 20. -
Exhaust tube 20 is implemented as a flexible pipe such as an accordion pipe, but may be a spiral pipe and the like. This allowsexhaust tube 20 to conform also to the shape ofexhaust pipe 30 having a complicated shape. Furthermore, since an exhaust flows throughexhaust tube 20, thisexhaust tube 20 can be suitably made of a material having acidic resistance. This is because acidic drainage water may be discharged together with an exhaust in the case wherecombustion apparatus 1 is a water heater of a latent heat recovery type as in the present embodiment. - Accordingly,
exhaust tube 20 can be made of a material having acidic resistance such as phenol resin, epoxy resin, silicone resin, fluorine resin such as polytetrafluoroethylene, unsaturated polyester resin, melamine resin, polycarbonate resin, methacryl styrene (MS) resin, methacryl resin, styrene acrylonitrile copolymer (AS) resin, ABS resin, polyethylene, polypropylene, polystyrene, polyethylene terephthalate (PET), and vinyl chloride resin, for example. -
Exhaust pipe 30 is attached to building 200 so as to extend from the inside to the outside, for example, through aroof 210 ofbuilding 200.Exhaust pipe 30 may extend from the inside to the outside through a wall.Exhaust pipe 30 is greater in outer diameter thanexhaust tube 20. In the inside of thisexhaust pipe 30, a part ofexhaust tube 20 on the side of theother end portion 20 b is inserted.Exhaust pipe 30 is formed of metal, for example.Exhaust pipe 30 is connected to fixingmember 50 at oneend portion 30 a shown inFIG. 3 . Furthermore,exhaust pipe 30 is connected to exhaust terminal 70 at theother end portion 30 b. -
Exhaust adapter 40 is located on theother end portion 20 b side ofexhaust tube 20 and also on theother end portion 30 b side ofexhaust pipe 30.Exhaust adapter 40 has an annular shape that surrounds a through hole.Exhaust adapter 40 is attached to the outer circumferential surface ofexhaust tube 20 and also to the inner circumferential surface ofexhaust pipe 30 by insertingexhaust tube 20 into the through hole. Specifically, thisexhaust adapter 40 is fitted on the outer circumferential surface ofexhaust tube 20 and fitted on the inner circumferential surface ofexhaust pipe 30.Exhaust adapter 40 has an inner circumferential surface that presses the outer circumferential surface ofexhaust tube 20 in the state where thisexhaust adapter 40 is fitted on the outer circumferential surface ofexhaust tube 20; and an outer circumferential surface that presses the inner circumferential surface ofexhaust pipe 30 in the state whereexhaust adapter 40 is fitted on the inner circumferential surface ofexhaust pipe 30. - Consequently, the inner circumferential surface of
exhaust adapter 40 comes into close contact with the outer circumferential surface ofexhaust tube 20 while the outer circumferential surface ofexhaust adapter 40 comes into close contact with the inner circumferential surface ofexhaust pipe 30. Accordingly,exhaust adapter 40 can fixexhaust tube 20 toexhaust pipe 30, and also, can prevent combustion gas or drainage water from leaking through betweenexhaust tube 20 andexhaust pipe 30 and flowing back into the room. - The above-described configuration can be readily achieved, for example, by
exhaust adapter 40 made of an elastic material. This elastic material is for example preferably a soft resin, or for example preferably EPDM (Ethylene-Propylene-Diene Monomer), soft PVC (polyvinyl chloride), silicone rubber, fluororubber, chloroprene rubber (CR), butyl rubber (IIR), or the like. Furthermore,exhaust adapter 40 may be made of one type elastic material, or may be made of a combination of a plurality of different types of elastic materials. - Referring to
FIGS. 1 and 3 , fixingmember 50 serves to fixexhaust tube 20 toexhaust pipe 30. Fixingmember 50 fixesexhaust tube 20 toexhaust pipe 30 in the state where it is attached to the outer circumferential surface ofexhaust tube 20. Fixingmember 50 is attached toexhaust pipe 30 at a position close tocombustion apparatus 1 relative to exhaustadapter 40. Furthermore, fixingmember 50 fixesconnection pipe 60 toexhaust pipe 30. - Fixing
member 50 is formed of an elastic body. This elastic body is for example preferably made of a soft resin, or for example preferably EPDM (Ethylene-Propylene-Diene Monomer), soft PVC (polyvinyl chloride), silicone rubber, fluororubber, chloroprene rubber (CR), butyl rubber (IIR), or the like. Furthermore, fixingmember 50 may be made of one type elastic material, or may be made of a combination of a plurality of different types of elastic materials. - Referring to
FIGS. 3 and 4 , fixingmember 50 is formed in a tubular shape. Fixingmember 50 mainly has a first fixingportion 50 a, asecond fixing portion 50 b, athird fixing portion 50 c, and amain body portion 50 d. - First fixing
portion 50 a is formed in a tubular shape. Specifically, first fixingportion 50 a has a cylindrical tubular shape. First fixingportion 50 a extends frommain body portion 50 d towardcombustion apparatus 1 shown inFIG. 1 . It is to be noted that first fixingportion 50 a may extend frommain body portion 50 d towardexhaust terminal 70 shown inFIG. 1 . - First fixing
portion 50 a is attached toexhaust tube 20. Specifically,exhaust tube 20 is introduced into a cylindrical through hole of first fixingportion 50 a, and the inner circumferential surface of first fixingportion 50 a is in contact with the outer circumferential surface ofexhaust tube 20. In other words, first fixingportion 50 a is fitted aroundexhaust tube 20. First fixingportion 50 a is formed to have an inner diameter smaller than the outer diameter ofexhaust tube 20, thereby allowingexhaust tube 20 to be fixed with the elastic force of first fixingportion 50 a. In the present embodiment, a bindingband 51 is tightened to squeeze the outer circumferential surface of first fixingportion 50 a, so that the inner circumferential surface of first fixingportion 50 a is brought firmly into contact with the outer circumferential surface ofexhaust tube 20. Thereby,exhaust tube 20 can be firmly fixed by first fixingportion 50 a. - Second fixing
portion 50 b is formed in a tubular shape. Specifically, second fixingportion 50 b has a cylindrical tubular shape. Second fixingportion 50 b is located outside of first fixingportion 50 a in the radial direction of fixingmember 50. Second fixingportion 50 b extends to the side opposite to the direction in which first fixingportion 50 a extends. In other words, second fixingportion 50 b extends frommain body portion 50 d towardexhaust terminal 70 shown inFIG. 1 . - Second fixing
portion 50 b is attached toexhaust pipe 30. Specifically, a part ofexhaust pipe 30 on the side of oneend portion 30 a is introduced into a cylindrical through hole of second fixingportion 50 b, and the inner circumferential surface of second fixingportion 50 b is in contact with the outer circumferential surface ofexhaust pipe 30. In other words, second fixingportion 50 b is fitted aroundexhaust pipe 30. Second fixingportion 50 b is formed to have an inner diameter smaller than the outer diameter ofexhaust pipe 30, thereby allowingexhaust pipe 30 to be fixed with the elastic force of second fixingportion 50 b. In the present embodiment, a bindingband 51 is tightened to squeeze the outer circumferential surface of second fixingportion 50 b, so that the inner circumferential surface of second fixingportion 50 b is brought firmly into contact with the outer circumferential surface ofexhaust pipe 30. Thereby,exhaust pipe 30 can be firmly fixed by second fixingportion 50 b. - It is to be noted that second fixing
portion 50 b may be fitted insideexhaust pipe 30. In this case, second fixingportion 50 b is formed to have an outer diameter larger than the inner diameter ofexhaust pipe 30, thereby allowingexhaust pipe 30 to be fixed with the elastic force of second fixingportion 50 b. - Third fixing
portion 50 c is formed in a tubular shape. Specifically, third fixingportion 50 c has a cylindrical tubular shape. Third fixingportion 50 c is located outside of first fixingportion 50 a in the radial direction of fixingmember 50. Furthermore, third fixingportion 50 c is located outside of second fixingportion 50 b in the radial direction of fixingmember 50. Third fixingportion 50 c extends to the side opposite to the direction in which second fixingportion 50 b extends. In other words, third fixingportion 50 c extends frommain body portion 50 d towardcombustion apparatus 1 shown inFIG. 1 . - Third fixing
portion 50 c is attached toconnection pipe 60. Specifically, a part ofconnection pipe 60 on the side of theother end portion 60 b is introduced into a cylindrical through hole of third fixingportion 50 c, and the inner circumferential surface of third fixingportion 50 c is in contact with the outer circumferential surface ofconnection pipe 60. In other words, third fixingportion 50 c is fitted aroundconnection pipe 60. Third fixingportion 50 c is formed to have an inner diameter smaller than the outer diameter ofconnection pipe 60, thereby allowingconnection pipe 60 to be fixed with the elastic force of third fixingportion 50 c. In the present embodiment, bindingband 51 is tightened to squeeze the outer circumferential surface of third fixingportion 50 c, so that the inner circumferential surface of third fixingportion 50 c is brought firmly into contact with the outer circumferential surface ofconnection pipe 60. Thereby,connection pipe 60 can be firmly fixed by third fixingportion 50 c. - It is to be noted that third fixing
portion 50 c may be fitted insideconnection pipe 60. In this case, third fixingportion 50 c is formed to have an outer diameter larger than the inner diameter ofconnection pipe 60, thereby allowingconnection pipe 60 to be fixed with the elastic force of third fixingportion 50 c. -
Main body portion 50 d connects first fixingportion 50 a and second fixingportion 50 b. Furthermore,main body portion 50 d connects second fixingportion 50 b and third fixingportion 50 c.Main body portion 50 d has an annular portion leading to first fixingportion 50 a; and a plate-shaped portion leading to this annular portion and second fixingportion 50 b. Furthermore, the plate-shaped portion also leads to third fixingportion 50 c. -
Main body portion 50 d has acommunication hole 50 e. The number of communication holes 50 e may be one, or may be two or more. In the present embodiment, a plurality of communication holes 50 e are provided. Eachcommunication hole 50 e allows communication between a first region R1 and a second region R2 separated from first region R1 bymain body portion 50 d. First region R1 is located between the outer circumferential surface ofexhaust tube 20 and the inner circumferential surface ofexhaust pipe 30. In the present embodiment,communication hole 50 e is provided in the plate-shaped portion and penetrates throughmain body portion 50 d in the direction in whichexhaust tube 20 extends (in the axial direction). Furthermore,communication hole 50 e also extends in the circumferential direction ofmain body portion 50 d. -
Communication hole 50 e is provided in the radial direction of fixingmember 50 between the outer circumferential surface of first fixingportion 50 a and the inner circumferential surface of second fixingportion 50 b. Furthermore,communication hole 50 e is provided in the radial direction of fixingmember 50 between the outer circumferential surface of first fixingportion 50 a and the inner circumferential surface of third fixingportion 50 c. - First fixing
portion 50 a and second fixingportion 50 b are concentrically arranged. Accordingly,exhaust tube 20 andexhaust pipe 30 are also concentrically arranged. Furthermore, third fixingportion 50 c is also arranged concentrically with first fixingportion 50 a and second fixingportion 50 b. Accordingly,connection pipe 60 is also arranged concentrically withexhaust tube 20 andexhaust pipe 30. - Referring to
FIG. 5 , a modification of fixingmember 50 in the present embodiment will then be described. In this modification, fixingmember 50 has a plurality ofslits 50 f. Specifically, first fixingportion 50 a is provided with a plurality ofslits 50 f. Each of theseslits 50 f is formed to extend from the tip end of first fixingportion 50 a toward the bottom side thereof. Second fixingportion 50 b is also provided with a plurality ofslits 50 f. Each of theseslits 50 f is formed to extend from the tip end of second fixingportion 50 b toward the bottom side thereof. It is to be noted that third fixingportion 50 c may also be provided with a plurality ofslits 50 f as in first fixingportion 50 a. - In the modification of fixing
member 50 according to the present embodiment, first fixingportion 50 a is provided with a plurality ofslits 50 f, so that the inner diameter of first fixingportion 50 a can be increased and decreased. Accordingly, the inner diameter of first fixingportion 50 a can be increased and decreased in accordance with the outer diameter ofexhaust tube 20. Thereby, first fixingportion 50 a allows fixation ofexhaust tubes 20 having a wide range of outer diameters. Furthermore, since first fixingportion 50 a is provided with a plurality ofslits 50 f, it becomes possible to suppress formation of creases in first fixingportion 50 a at the time when bindingband 51 is tightened to squeeze first fixingportion 50 a. - Furthermore, since second fixing
portion 50 b is also provided with a plurality ofslits 50 f, the inner diameter of second fixingportion 50 b can also be increased and decreased. Accordingly, the inner diameter of second fixingportion 50 b can be increased and decreased in accordance with the outer diameter ofexhaust pipe 30. Thereby, second fixingportion 50 b allows fixation ofexhaust pipes 30 having a wide range of outer diameters. Furthermore, since second fixingportion 50 b is provided with a plurality ofslits 50 f, it becomes possible to suppress formation of creases in second fixingportion 50 b at the time when bindingband 51 is tightened to squeeze second fixingportion 50 b. Furthermore, first fixingportion 50 a and second fixingportion 50 b each are provided with a plurality ofslits 50 f, thereby allowing combinations ofexhaust tubes 20 having a wide range of outer diameters andexhaust pipes 30 having a wide range of outer diameters, respectively. - Referring to
FIGS. 1 and 6 ,connection pipe 60 serves to coverexhaust tube 20 to protect thisexhaust tube 20.Connection pipe 60 is connected to fixingmember 50 andcombustion apparatus 1.Connection pipe 60 is greater in outer diameter thanexhaust tube 20. A part ofexhaust tube 20 on the side of oneend portion 20 a is introduced intoconnection pipe 60. - It is to be noted that
connection pipe 60 is implemented as a flexible pipe such as an accordion pipe, but may be a spiral pipe.Connection pipe 60 has flexibility, thereby allowing thisconnection pipe 60 to readily conform to the shape ofexhaust tube 20. Furthermore,connection pipe 60 andcombustion apparatus 1 can readily be connected. - Furthermore,
connection pipe 60 may be a pipe made of aluminum, for example. In this case, sinceconnection pipe 60 can be reduced in weight, the load on fixingmember 50 supportingconnection pipe 60 can be decreased. Also, sinceconnection pipe 60 has a certain degree of hardness, it becomes possible to suppress deformation ofconnection pipe 60 caused by its self-weight. Furthermore, since the pipe made of aluminum can be relatively readily processed, for example, cut and the like, it can readily be adapted to the length ofexhaust tube 20, for example. - Second region R2 is provided between the outer circumferential surface of
exhaust tube 20 and the inner circumferential surface ofconnection pipe 60. Furthermore,combustion apparatus 1 includes ahousing 9 having an internal space.Housing 9 has aconnection hole 9 aa that allows communication between the internal space and second region R2.Housing 9 will be described later in detail. - Again referring to
FIGS. 1 and 2 ,exhaust terminal 70 is attached to a tip end ofexhaust pipe 30 on the outside of the building.Exhaust terminal 70 has a circumferential wall that is provided with an exhaust port through which combustion gas is emitted to the outside (outdoors). This exhaust port allows the combustion gas guided throughexhaust tube 20 to be emitted fromexhaust terminal 70 to the outside of building 200 throughexhaust pipe 30. -
Exhaust terminal 70 may be an outer cover attached on the outer circumferential side ofexhaust pipe 30 or may be an inner cover attached on the inner circumferential side ofexhaust pipe 30.Exhaust terminal 70 is made, for example, of such a material as aluminum or stainless steel. -
Combustion apparatus 1 used in exhaust structure forcombustion apparatus 100 described above may be a water heater of a latent heat recovery type, for example, adapted to an exhaust suction and combustion system, as described above. The configuration of the water heater of a latent heat recovery type adapted to the exhaust suction and combustion system will be described below. - Referring to
FIGS. 7 and 8 ,combustion apparatus 1 mainly has aburner 2, aprimary heat exchanger 3, asecondary heat exchanger 4, anexhaust box 5, afan 6, aconnection pipe 7, adrainage water tank 8, ahousing 9, andpipes 10 to 16. -
Burner 2 serves to produce combustion gas by burning fuel gas. Agas supply pipe 11 is connected toburner 2. Thisgas supply pipe 11 serves to supply fuel gas toburner 2. A gas valve (not shown) implemented, for example, by an electromagnetic valve is attached to thisgas supply pipe 11. - A
spark plug 2 a is disposed aboveburner 2. Thisspark plug 2 a serves to ignite an air fuel mixture injected fromburner 2 to thereby produce a flame, by generating sparks between the plug and a target (not shown) provided inburner 2 by activating an ignition device (an igniter).Burner 2 generates a quantity of heat by burning fuel gas supplied from gas supply pipe 11 (which is called a combustion operation). -
Primary heat exchanger 3 is a heat exchanger of a sensible heat recovery type. Thisprimary heat exchanger 3 mainly has a plurality of plate-shapedfins 3 b, aheat conduction pipe 3 a penetrating the plurality of plate-shapedfins 3 b, and acase 3c accommodating fins 3 b andheat conduction pipe 3 a.Primary heat exchanger 3 exchanges heat with the combustion gas generated byburner 2, and specifically, it serves to heat hot water and water which flows throughheat conduction pipe 3 a ofprimary heat exchanger 3 with the quantity of heat generated as a result of the combustion operation ofburner 2. -
Secondary heat exchanger 4 is a heat exchanger of a latent heat recovery type. Thissecondary heat exchanger 4 is located downstream ofprimary heat exchanger 3 in a flow of the combustion gas and connected in series withprimary heat exchanger 3. Sincecombustion apparatus 1 according to the present embodiment thus hassecondary heat exchanger 4 of a latent heat recovery type, it serves as a water heater of a latent heat recovery type. -
Secondary heat exchanger 4 mainly has a drainagewater discharge port 4 a, a heat conduction pipe 4 b, a sidewall 4 c, abottom wall 4 d, and an upper wall 4 g. Heat conduction pipe 4 b is layered as it is spirally wound. Sidewall 4 c,bottom wall 4 d and upper wall 4 g are arranged to surround heat conduction pipe 4 b. - In
secondary heat exchanger 4, hot water and water which flows through heat conduction pipe 4 b is pre-heated (heated) through heat exchange with the combustion gas of which heat has been exchanged inprimary heat exchanger 3. As a temperature of the combustion gas is lowered to approximately 60° C. through this process, moisture contained in the combustion gas is condensed so that latent heat can be obtained. In addition, latent heat is recovered insecondary heat exchanger 4 and moisture contained in the combustion gas is condensed, whereby drainage water is produced. -
Bottom wall 4 d serves as a partition betweenprimary heat exchanger 3 andsecondary heat exchanger 4, and it also serves as an upper wall ofprimary heat exchanger 3. Thisbottom wall 4 d is provided with an opening portion 4 e, and this opening portion 4 e allows communication between a space whereheat conduction pipe 3 a ofprimary heat exchanger 3 is arranged and a space where heat conduction pipe 4 b ofsecondary heat exchanger 4 is arranged. As shown by hollow arrows inFIG. 8 , the combustion gas can flow fromprimary heat exchanger 3 tosecondary heat exchanger 4 through opening portion 4 e. In this embodiment, for the sake of simplification, although one common component is employed forbottom wall 4 d ofsecondary heat exchanger 4 and the upper wall ofprimary heat exchanger 3, an exhaust collection and guide member may be connected betweenprimary heat exchanger 3 andsecondary heat exchanger 4. - Upper wall 4 g is provided with an
opening portion 4 h, and thisopening portion 4 h allows communication between the space where heat conduction pipe 4 b ofsecondary heat exchanger 4 is arranged and an internal space inexhaust box 5. As shown by hollow arrows inFIG. 8 , the combustion gas can flow fromsecondary heat exchanger 4 into the internal space inexhaust box 5 throughopening portion 4 h. - Drainage
water discharge port 4 a is provided in sidewall 4 c orbottom wall 4 d. This drainagewater discharge port 4 a opens at a lowest position in the space surrounded by side wall 4 c,bottom wall 4 d and upper wall 4 g (the lowermost position in the vertical direction in the state where the water heater is placed), which is lower than the lowermost portion of heat conduction pipe 4 b. Thus, drainage water produced insecondary heat exchanger 4 can be guided to drainagewater discharge port 4 a alongbottom wall 4 d and sidewall 4 c as shown by a black arrow inFIG. 8 . -
Exhaust box 5 forms a path for a flow of the combustion gas betweensecondary heat exchanger 4 andfan 6. Thisexhaust box 5 can guide, tofan 6, the combustion gas of which heat has been exchanged insecondary heat exchanger 4.Exhaust box 5 is attached tosecondary heat exchanger 4 and located downstream ofsecondary heat exchanger 4 in the flow of the combustion gas. -
Exhaust box 5 mainly has a box main body 5 a and afan connection portion 5 b. An internal space in box main body 5 a communicates through openingportion 4 h insecondary heat exchanger 4 with the internal space where heat conduction pipe 4 b ofsecondary heat exchanger 4 is arranged.Fan connection portion 5 b is provided so as to protrude from an upper portion of box main body 5 a. Thisfan connection portion 5 b has, for example, a cylindrical shape, and aninternal space 5 ba thereof communicates with the internal space in box main body 5 a. -
Fan 6 serves to emit the combustion gas (of which heat has been exchanged in secondary heat exchanger 4), which has passed throughsecondary heat exchanger 4, to the outside ofcombustion apparatus 1 by suctioning the combustion gas. Thisfan 6 is located downstream ofexhaust box 5 andsecondary heat exchanger 4 in the flow of the combustion gas. Namely, incombustion apparatus 1,burner 2,primary heat exchanger 3,secondary heat exchanger 4,exhaust box 5, andfan 6 are arranged in this order from upstream to downstream in the flow of the combustion gas produced inburner 2. Since the combustion gas is suctioned and exhausted by means offan 6 as above in this arrangement,combustion apparatus 1 in the present embodiment is a water heater adapted to the exhaust suction and combustion system. -
Fan 6 mainly has arotor 6 a, afan case 6 b, adrive source 6 c, and arotation shaft 6 d.Fan case 6 b is attached tofan connection portion 5 b ofexhaust box 5 such that the internal space infan case 6 b and the internal space infan connection portion 5 b communicate with each other. Thus, as shown by the hollow arrows inFIG. 8 , the combustion gas can be suctioned from box main body 5 a ofexhaust box 5 throughfan connection portion 5 b intofan case 6 b. -
Rotor 6 a is arranged infan case 6 b. Thisrotor 6 a is connected to drivesource 6 c withrotation shaft 6 d interposed therebetween. Thus,rotor 6 a is provided with drive force fromdrive source 6 c and can rotate aroundrotation shaft 6 d. By rotation ofrotor 6 a, the combustion gas inexhaust box 5 can be suctioned from the inner circumferential side ofrotor 6 a and can be emitted to the outer circumferential side ofrotor 6 a. -
Connection pipe 7 is connected to a region withinfan case 6 b, on the outer circumferential side of a region whererotor 6 a is arranged. Therefore, the combustion gas emitted to the outer circumferential side ofrotor 6 a byrotor 6 a offan 6 can be emitted intoexhaust tube 20 throughconnection pipe 7. - The combustion gas produced by
burner 2 as above is suctioned byfan 6 by rotation ofrotor 6 a above, so that the combustion gas can reachfan 6 after passage throughprimary heat exchanger 3,secondary heat exchanger 4 andexhaust box 5 in this order as shown by the hollow arrows inFIG. 8 and can be emitted to the outside ofcombustion apparatus 1. -
Drainage water tank 8 serves to store drainage water produced insecondary heat exchanger 4. Thisdrainage water tank 8 is connected tosecondary heat exchanger 4 throughpipe 10.Pipe 10 is connected to drainagewater discharge port 4 a ofsecondary heat exchanger 4. Thus, the drainage water produced insecondary heat exchanger 4 can be discharged todrainage water tank 8. Apipe 15 extending to the outside ofcombustion apparatus 1 is connected todrainage water tank 8. The drainage water stored indrainage water tank 8 can be discharged to the outside ofcombustion apparatus 1 through thispipe 15. - This
drainage water tank 8 has a water seal structure. Namely,drainage water tank 8 has such a structure that, when a prescribed amount of drainage water is stored indrainage water tank 8, the stored drainage water cannot allow air to pass throughdrainage water tank 8. By such a water seal structure ofdrainage water tank 8, entry of air outside combustion apparatus 1 (outside air) into combustion apparatus 1 (secondary heat exchanger 4) throughdrainage water tank 8 viapipe 15 can be prevented. - It is to be noted that the lower portion of
drainage water tank 8 is connected to apipe 16 for discharging drainage water, separately frompipe 15. This pipe 16 (usually closed) for discharging drainage water is designed such that drainage water withindrainage water tank 8 that cannot be discharged throughpipe 15 can be discharged by opening thispipe 16 during maintenance and the like. Furthermore,drainage water tank 8 has an internal space that may contain a neutralizing agent (not shown) for neutralizing acidic drainage water. - A
water supply pipe 12 is connected to one end of heat conduction pipe 4 b ofsecondary heat exchanger 4 and a hotwater delivery pipe 13 is connected to one end ofheat conduction pipe 3 a ofprimary heat exchanger 3. The other end ofheat conduction pipe 3 a ofprimary heat exchanger 3 and the other end of heat conduction pipe 4 b ofsecondary heat exchanger 4 are connected to each other through apipe 14. Each ofgas supply pipe 11,water supply pipe 12 and hotwater delivery pipe 13 described above leads to the outside, for example, in a top portion ofcombustion apparatus 1.Burner 2,primary heat exchanger 3,secondary heat exchanger 4,exhaust box 5,fan 6,drainage water tank 8, and the like are arranged inhousing 9. - Again referring to
FIGS. 6 and 7 ,housing 9 has aconnection portion 9 a and anexhaust portion 9 b. Specifically,housing 9 has an upper surface provided withtubular connection portion 9 a andtubular exhaust portion 9 b that are concentrically arranged and protrude in the upward direction. In other words,connection portion 9 a andexhaust portion 9 b form a double-pipe structure. -
Connection portion 9 a is provided so as to surround the outer circumferential surface ofexhaust portion 9 b. Furthermore,connection hole 9 aa is provided in a region ofhousing 9 between the outer circumferential surface ofexhaust portion 9 b and the inner circumferential surface ofconnection portion 9 a. Anexhaust port 9 bb is provided insideexhaust portion 9 b ofhousing 9.Connection hole 9 aa communicates with the inside ofhousing 9 whileexhaust port 9 bb communicates with the inside ofconnection pipe 7. Accordingly, second region R2 provided between the outer circumferential surface ofexhaust tube 20 and the inner circumferential surface ofconnection pipe 60 communicates with the internal space ofhousing 9 throughconnection hole 9 aa provided inhousing 9. Furthermore, the combustion gas having flown throughburner 2 is sent fromconnection pipe 7 to exhausttube 20 viaexhaust portion 9 b. -
Connection portion 9 a is connected toconnection pipe 60 on the oneend portion 60 a side thereof whileexhaust portion 9 b is connected to exhausttube 20 on the oneend portion 20 a side thereof. In addition,exhaust portion 9 b is connected also toconnection pipe 7 housed withinhousing 9. For example,exhaust portion 9 b is formed to protrude also downward in a tubular manner from the upper surface ofhousing 9, so thatexhaust portion 9 b andconnection pipe 7 can be readily connected to each other. -
Connection portion 9 a andconnection pipe 60 only have to be connected to each other so as to prevent leakage of the gas flowing therethrough. Similarly,exhaust portion 9 b and exhaust tube 20 (and connection pipe 7) only have to be connected to each other so as to prevent leakage of the gas flowing therethrough. Accordingly, an O-ring may be interposed between these components connected to each other, or these components may be firmly bound using a binding band. It is to be noted that connection between these components may be implemented by an inner cover or an outer cover. - Then, the functions and effects of the present embodiment will be described.
- As described above, in the case where
combustion apparatus 1 already placed inside the building is replaced with anew combustion apparatus 1, the already-placedexhaust pipe 30 is left unremoved and anew exhaust tube 20 is inserted into this already-placedexhaust pipe 30, so thatcombustion apparatus 1 can be replaced. In other words, an exhaust produced incombustion apparatus 1 is to be guided throughexhaust tube 20 inserted intoexhaust pipe 30, and emitted to the outside of a building. - In the case where a
new exhaust tube 20 is inserted into the already-placedexhaust pipe 30 from inside of the building,exhaust tube 20 may fall into inside of the building from inside ofexhaust pipe 30 ifexhaust tube 20 is merely inserted intoexhaust pipe 30 but not fixed in this state. - According to exhaust structure for
combustion apparatus 100 of the present embodiment, as shown inFIG. 3 ,exhaust tube 20 is fixed toexhaust pipe 30 in the state where second fixingportion 50 b of fixingmember 50 is attached toexhaust pipe 30 and first fixingportion 50 a is attached to the outer circumferential surface ofexhaust tube 20. Accordingly, fixingmember 50 can prevent falling ofexhaust tube 20 inserted intoexhaust pipe 30. - Furthermore, fixing
member 50 is attached toexhaust pipe 30 at a position close tocombustion apparatus 1 relative to exhaustadapter 40. Even in the case whereexhaust tube 20 can be fixed toexhaust pipe 30 byexhaust adapter 40,exhaust tube 20 cannot be fixed until it reachesexhaust adapter 40 sinceexhaust tube 20 is inserted intoexhaust pipe 30 from inside of the building. According to the present embodiment, since fixingmember 50 is attached toexhaust pipe 30 at a position close tocombustion apparatus 1 relative to exhaustadapter 40, fixingmember 50 can prevent falling ofexhaust tube 20, which is inserted intoexhaust pipe 30, even beforeexhaust adapter 40 is attached. - In exhaust structure for
combustion apparatus 100 according to the present embodiment, as shown inFIG. 3 , fixingmember 50 is provided withcommunication hole 50 e that allows communication between first region R1 and second region R2. Accordingly, in the case where an exhaust leaks to first region R1 due to damage ofexhaust tube 20 or the like, the exhaust can be emitted from first region R1 to second region R2 throughcommunication hole 50 e. - In exhaust structure for
combustion apparatus 100 according to the present embodiment, as shown inFIG. 3 , first fixingportion 50 a and second fixingportion 50 b each have a cylindrical shape and are concentrically arranged. Accordingly, whenexhaust tube 20 is inserted intoexhaust pipe 30, the outer circumferential surface ofexhaust tube 20 is less likely to come into contact with the inner circumferential surface ofexhaust pipe 30. Thereby,exhaust tube 20 can be readily inserted intoexhaust pipe 30. - In exhaust structure for
combustion apparatus 100 according to the present embodiment, as shown inFIG. 1 , a part ofexhaust tube 20 is inserted intoconnection pipe 60. Accordingly,exhaust tube 20 can be protected byconnection pipe 60 from ultraviolet light or force applied from outside. - Furthermore, as shown in
FIG. 6 ,housing 9 hasconnection hole 9 aa that allows communication between the internal space and second region R2 that is provided between the outer circumferential surface ofexhaust tube 20 and the inner circumferential surface ofconnection pipe 60. Accordingly, in the case where damage ofexhaust tube 20 or the like causes leakage of an exhaust to first region R1 between the outer circumferential surface ofexhaust tube 20 and the inner circumferential surface ofexhaust pipe 30, this exhaust can be emitted from first region R1 throughcommunication hole 50 e to second region R2 provided between the outer circumferential surface ofexhaust tube 20 and the inner circumferential surface ofconnection pipe 60. Furthermore, an exhaust can be emitted from second region R2 to the internal space throughconnection hole 9 aa. Consequently, leakage of an exhaust into a room can be prevented. - In the exhaust structure for combustion apparatus according to the present embodiment, as shown in
FIG. 7 ,combustion apparatus 1 is a water heater adapted to an exhaust suction and combustion system. The water heater adapted to an exhaust suction and combustion system can maintain a stabilized combustion state even in the case whereexhaust tube 20 is decreased in diameter. - In other words, since
combustion apparatus 1 serving as a water heater adapted to an exhaust suction and combustion system is used, the combustion operation byburner 2 can be stabilized for the water heater of a so-called an exhaust pushing type even in the case whereexhaust tube 20 is decreased in diameter, which will be hereinafter described. - In the water heater of a so-called exhaust pushing type, a fan, a burner, a primary heat exchanger, and a secondary heat exchanger are arranged in this order from upstream to downstream in the flow of the combustion gas. In other words, the combustion gas produced by the burner is guided by the fan to flow through the primary heat exchanger and the secondary heat exchanger into the exhaust tube provided outside of the water heater.
- The combustion gas pushed out by the fan receives flow path resistance caused by the primary heat exchanger and the secondary heat exchanger before this combustion gas reaches the exhaust tube. Accordingly, the blast pressure of the combustion gas immediately in front of the exhaust tube is lowered by this flow path resistance. For this reason, the blast pressure caused by the fan should be raised in order to push the combustion gas into the exhaust tube having a relatively small diameter. However, when the blast pressure of the fan is raised, the internal pressure within the burner case is raised. Consequently, in the case where the fuel gas is supplied to the burner at relatively low pressure, the combustion operation becomes unstable.
- On the other hand, according to the exhaust suction and combustion system in the present embodiment,
burner 2,primary heat exchanger 3,secondary heat exchanger 4, andfan 6 are arranged in this order from upstream to downstream in the flow of the combustion gas. In this system, negative pressure occurs on the upstream side offan 6, which eliminates the need to raise the blast pressure offan 6. Accordingly, even in the case whereexhaust tube 20 is decreased in diameter, the internal pressure within the burner case can be maintained low. Therefore, the combustion operation can be stabilized even if the fuel gas is supplied toburner 2 at relatively low pressure. - Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being interpreted by the terms of the appended claims.
Claims (5)
1. An exhaust structure for combustion apparatus, comprising:
a combustion apparatus;
an exhaust tube having one end portion and the other end portion, and connected to said combustion apparatus at said one end portion;
an exhaust pipe, in which a part of said exhaust tube on a side of said other end portion being inserted;
an exhaust adapter having an annular shape surrounding a through hole, and attached to an outer circumferential surface of said exhaust tube and to an inner circumferential surface of said exhaust pipe by inserting said exhaust tube into said through hole; and
a fixing member formed of an elastic body, attached to said exhaust pipe at a position close to said combustion apparatus relative to said exhaust adapter, and fixing said exhaust tube to said exhaust pipe while being attached to the outer circumferential surface of said exhaust tube.
2. The exhaust structure for combustion apparatus according to claim 1 , wherein
said fixing member includes
a first fixing portion attached to said exhaust tube,
a second fixing portion attached to said exhaust pipe, and
a main body portion connecting said first fixing portion and said second fixing portion, and
said main body portion has a communication hole that allows communication between a first region and a second region separated from said first region by said main body portion, said first region being located between the outer circumferential surface of said exhaust tube and the inner circumferential surface of said exhaust pipe.
3. The exhaust structure for combustion apparatus according to claim 2 , wherein said first fixing portion and said second fixing portion each have a cylindrical shape and are concentrically arranged.
4. The exhaust structure for combustion apparatus according to claim 2 , further comprising a connection pipe connected to said fixing member and said combustion apparatus, a part of said exhaust tube on a side of said one end portion being inserted into said connection pipe, wherein
said second region is provided between the outer circumferential surface of said exhaust tube and an inner circumferential surface of said connection pipe,
said combustion apparatus includes a housing having an internal space, and
said housing has a connection hole that allows communication between said internal space and said second region.
5. The exhaust structure for combustion apparatus according to claim 1 , wherein said combustion apparatus is a water heater adapted to an exhaust suction and combustion system.
Priority Applications (1)
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US14/466,423 US20160053994A1 (en) | 2014-08-22 | 2014-08-22 | Exhaust structure for combustion apparatus |
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US14/466,423 US20160053994A1 (en) | 2014-08-22 | 2014-08-22 | Exhaust structure for combustion apparatus |
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US20160053994A1 true US20160053994A1 (en) | 2016-02-25 |
Family
ID=55348003
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US14/466,423 Abandoned US20160053994A1 (en) | 2014-08-22 | 2014-08-22 | Exhaust structure for combustion apparatus |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3415801A1 (en) * | 2017-06-12 | 2018-12-19 | Schiedel GmbH | Connection device, system from an intermediate plate and a connection device, device for operating a fireplace and method of connecting a double tube with a fireplace |
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