US20190195563A1 - Heat exchange device and heat source machine - Google Patents
Heat exchange device and heat source machine Download PDFInfo
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- US20190195563A1 US20190195563A1 US16/208,585 US201816208585A US2019195563A1 US 20190195563 A1 US20190195563 A1 US 20190195563A1 US 201816208585 A US201816208585 A US 201816208585A US 2019195563 A1 US2019195563 A1 US 2019195563A1
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- Prior art keywords
- pipes
- heat exchanger
- exchange device
- linear portions
- heat exchange
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Classifications
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- 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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
- F24H1/30—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle being built up from sections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
- F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
- F28D1/0443—Combination of units extending one beside or one above the other
-
- 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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
-
- 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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/44—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40
- F24H1/445—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40 with integrated flue gas condenser
-
- 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
- F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
-
- 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
- F24H9/0005—Details for water heaters
-
- 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
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
- F28D1/0461—Combination of different types of heat exchanger, e.g. radiator combined with tube-and-shell heat exchanger; Arrangement of conduits for heat exchange between at least two media and for heat exchange between at least one medium and the large body of fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0007—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium
- F28D7/0091—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium the supplementary medium flowing in series through the units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers
-
- 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]
Definitions
- the disclosure relates to a heat exchange device and a heat source machine, and more particularly to a heat exchange device having a primary heat exchanger and a secondary heat exchanger and a heat source machine having the same.
- a heat exchange device including a primary heat exchanger for recovering sensible heat and a secondary heat exchanger for recovering latent heat.
- This heat exchange device is described in, for example, Japanese Laid-open No. 2017-211173 (Patent Document 1).
- the secondary heat exchanger has a plurality of heat absorbing pipes.
- the plurality of heat absorbing pipes are arranged vertically.
- Each of the plurality of heat absorbing pipes extends in a zigzag manner in a forward and backward direction.
- each of the plurality of heat absorbing pipes extends in a zigzag manner in the forward and backward direction (horizontal direction), drainage performance is poor when water is discharged from the heat absorbing pipes. Further, since a combustion gas flowing from the primary heat exchanger into the secondary heat exchanger first comes into contact with the uppermost heat absorbing pipe among the plurality of heat absorbing pipes, the uppermost heat absorbing pipe reaches the highest temperature. Therefore, scale (boiler scale) precipitated due to minerals contained in water tends to accumulate in the uppermost heat absorbing pipes more than in the heat absorbing pipes located below the uppermost heat absorbing pipe. As a result, a balance in distribution of water between the plurality of heat absorbing pipes deteriorates.
- a heat exchange device of an embodiment of the disclosure is a heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas.
- the heat exchange device includes a primary heat exchanger and a secondary heat exchanger.
- the primary heat exchanger is for recovering the sensible heat of the combustion gas.
- the secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and is for recovering the latent heat of the combustion gas.
- the secondary heat exchanger includes a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction.
- Each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series.
- Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from one of the plurality of linear portions of one of the plurality of first pipes in the vertical direction.
- a heat source machine of an embodiment of the disclosure includes the above-described heat exchange device, and a burner.
- the burner is disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger.
- the burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger.
- FIG. 1 a diagram schematically showing a configuration of a heat source machine according to an embodiment of the disclosure.
- FIG. 2 is a perspective view schematically showing a configuration of a heat exchange device according to the embodiment of the disclosure.
- FIG. 3 is a side view showing an internal structure of the heat exchange device according to the embodiment of the disclosure with a broken line.
- FIG. 4 is a perspective view schematically showing a configuration of a secondary heat exchanger according to the embodiment of the disclosure.
- FIG. 5 is an exploded perspective view schematically showing the configuration of the secondary heat exchanger according to the embodiment of the disclosure.
- FIG. 6 is a top view schematically showing the configuration of the secondary heat exchanger according to the embodiment of the disclosure.
- FIG. 7 is a rear view showing the internal structure of the heat exchange device according to an embodiment of the disclosure with a broken line.
- FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 2 .
- FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 2 .
- the embodiments of the disclosure provide a heat exchange device capable of improving drainage performance and improving the balance of distribution of water and a heat source machine including the same.
- a heat exchange device of an embodiment of the disclosure is a heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas.
- the heat exchange device includes a primary heat exchanger and a secondary heat exchanger.
- the primary heat exchanger is for recovering the sensible heat of the combustion gas.
- the secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and is for recovering the latent heat of the combustion gas.
- the secondary heat exchanger includes a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction.
- Each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series.
- Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from one of the plurality of linear portions of one of the plurality of first pipes in the vertical direction.
- each of the plurality of first pipes and the plurality of second pipes extends in the zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series. Therefore, when water is discharged from each of the plurality of first pipes and the plurality of second pipes, the water drains from an upper side to a lower side due to gravity, and thus drainage performance can be improved. Further, since the secondary heat exchanger is disposed to overlap the primary heat exchanger in the vertical direction in the state in which the heat exchange device is installed, the combustion gas flows into the secondary heat exchanger in the vertical direction.
- each of the plurality of first pipes and the plurality of second pipes are disposed in a direction intersecting the vertical direction, each of the plurality of first pipes and each of the plurality of second pipes comes into contact with the combustion gas uniformly. Therefore, scale (boiler scale) is deposited uniformly in each of the plurality of first pipes and each of the plurality of second pipes. Therefore, it is possible to prevent a balance in distribution of the water from deteriorating in each of the plurality of first pipes and the plurality of second pipes. That is, the balance in distribution of the water can be improved. Further, each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction. Therefore, it is possible to reduce flow path resistance when the combustion gas flows in the vertical direction between each of the plurality of linear portions of each of the plurality of first pipes and each of the plurality of linear portions of each of the plurality of second pipes.
- the primary heat exchanger includes a plurality of fin pipes.
- Each of the plurality of fin pipes extends in a direction in which the plurality of linear portions extend. Therefore, the combustion gas flows between each of the plurality of first pipes and each of the plurality of second pipes along a flow of combustion gas flowing between the plurality of fin pipes. Thus, it is possible to reduce the flow path resistance when the combustion gas flows from the primary heat exchanger to the secondary heat exchanger in the vertical direction.
- the secondary heat exchanger comprises a circumferential wall portion surrounding the plurality of first pipes and the plurality of second pipes.
- the circumferential wall portion comprises a main body portion and an expanded portion which expands outward from the main body portion.
- Each of the plurality of first pipes and each of the plurality of second pipes are disposed in an inner space of the circumferential wall portion surrounded by the main body portion and an inner space of the circumferential wall portion expanded due to the expanded portion. Therefore, the main body portion can be made smaller than the expanded portion.
- the plurality of first pipes and the plurality of second pipes are disposed in the inner space of the circumferential wall portion expanded due to the expanded portion, a heat transfer area of the plurality of first pipes and the plurality of second pipes can be increased as compared with a case in which the expanded portion is not provided. Thus, it is possible to improve heat exchange efficiency of the plurality of first pipes and the plurality of second pipes while the main body portion is miniaturized.
- a heat source machine of an embodiment of the disclosure includes the above-described heat exchange device, and a burner.
- the burner is disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger.
- the burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger.
- a heat source machine including a heat exchange device capable of improving the drainage performance and improving the balance in distribution of the water.
- FIG. 1 a configuration of a heat source machine 100 according to an embodiment of the disclosure will be described.
- the heat source machine 100 mainly includes a spark plug 1 , a primary heat exchanger (sensible heat recovery heat exchanger) 10 , a secondary heat exchanger (latent heat recovery heat exchanger) 20 , a burner 30 , a chamber 31 , a blowing device 32 , a duct 33 , a venturi 34 , an orifice 35 , a gas valve 36 , a pipe 40 , a bypass pipe 41 , a three-way valve 42 , and a housing 50 .
- the primary heat exchanger 10 and the secondary heat exchanger 20 form a heat exchange device 200 . All of the above components except for the housing 50 are disposed inside the housing 50 .
- the above-mentioned components are the same as those in the related art except for the heat exchange device 200 .
- a mixed gas mixed by the venturi 34 is delivered to the blowing device 32 .
- the blowing device 32 is for supplying the mixed gas to the burner 30 .
- the blowing device 32 is connected to the chamber 31 , and the chamber 31 is connected to the burner 30 .
- the mixed gas supplied from the blowing device 32 is delivered to the burner 30 through the chamber 31 .
- the burner 30 is for generating a heating gas (combustion gas) which is supplied to the primary heat exchanger 10 .
- the mixed gas blown out from the burner 30 is ignited by the spark plug 1 and becomes a combustion gas.
- the burner 30 , the primary heat exchanger 10 , and the secondary heat exchanger 20 are connected so that a combustion gas sequentially passes through the primary heat exchanger 10 and the secondary heat exchanger 20 to exchange heat with hot water.
- the burner 30 is disposed on a side of the primary heat exchanger 10 opposite to the secondary heat exchanger 20 .
- the burner 30 is configured to be able to supply the combustion gas in the order of the primary heat exchanger 10 and the secondary heat exchanger 20 .
- the burner 30 is disposed above the primary heat exchanger 10 .
- the burner 30 is of a reverse combustion type.
- the burner 30 may be a premix burner of which a capacity fluctuates over an entire region of a combustion chamber frontage.
- the duct 33 is connected to the secondary heat exchanger 20 , and the duct 33 extends to the outside of the housing 50 . Accordingly, the combustion gas which has passed through the secondary heat exchanger 20 is discharged outside of the housing 50 through the duct 33 .
- a portion of the pipe 40 on a hot water outlet side from the primary heat exchanger 10 and the bypass pipe 41 are connected by the three-way valve 42 .
- the heat exchange device 200 is capable of recovering sensible heat and latent heat of the combustion gas.
- the heat exchange device 200 has the primary heat exchanger 10 and the secondary heat exchanger 20 .
- the primary heat exchanger 10 is for recovering the sensible heat of the combustion gas.
- the secondary heat exchanger 20 is for recovering the latent heat of the combustion gas.
- the primary heat exchanger 10 and the secondary heat exchanger 20 are disposed to overlap in a first direction D 1 .
- the secondary heat exchanger 20 is disposed to overlap the primary heat exchanger 10 in a vertical direction in a state in which the heat exchange device 200 is installed. That is, in the state in which the heat exchange device 200 is installed, the first direction D 1 is the vertical direction.
- the primary heat exchanger 10 is connected to the secondary heat exchanger 20 .
- the combustion gas is supplied through an upper opening of the primary heat exchanger 10 , and the combustion gas is exhausted through a lower opening of the secondary heat exchanger 20 .
- the hot water entering the secondary heat exchanger 20 from a water inlet portion 20 a of the secondary heat exchanger 20 exchanges heat with the combustion gas, then exits from a hot water outlet portion 20 b and enters a water inlet portion 10 a of the primary heat exchanger 10 via a pipe (not shown).
- the hot water which has entered the water inlet portion 10 a of the primary heat exchanger 10 exchanges heat with the combustion gas and then exits from a hot water outlet portion 10 b .
- the water inlet portion 10 a is a portion through which the hot water first enters the primary heat exchanger 10 .
- the hot water outlet portion 10 b is a portion through which the hot water finally exits from the primary heat exchanger 10 .
- the primary heat exchanger 10 includes the water inlet portion 10 a , the hot water outlet portion 10 b , a heat exchanging portion 11 , a shell plate 12 , a shell pipe portion 13 , a header member 14 , and a bend pipe 15 .
- the heat exchanging portion 11 includes a plurality of fins 11 a and a plurality of fin pipes 11 b .
- Each of the plurality of fins 11 a and the plurality of fin pipes 11 b may be formed of SUS (stainless steel).
- the heat exchanging portion 11 is configured so that the combustion gas flows outside the plurality of fins 11 a and the plurality of fin pipes 11 b and water flows inside the plurality of fin pipes 11 b .
- the plurality of fins 11 a are stacked on each other.
- the plurality of fin pipes 11 b pass through the plurality of fins 11 a .
- FIGS. 2 and 3 for convenience of description, only some of the plurality of fins 11 a are illustrated.
- the shell plate 12 surrounds the heat exchanging portion 11 .
- the shell plate 12 includes a front surface portion 12 a , a pair of side surface portions 12 b , and a back surface portion 12 c .
- the front surface portion 12 a , the pair of side surface portions 12 b , and the back surface portion 12 c form a square frame.
- the shell plate 12 has openings at the top and bottom.
- the shell plate 12 can supply the combustion gas to the inside of the shell plate 12 through the upper opening.
- the shell plate 12 can exhaust the combustion gas to the outside of the shell plate 12 through the lower opening.
- the shell pipe portion 13 is disposed along inner surfaces of the pair of side surface portions 12 b and the back surface portion 12 c of the shell plate 12 .
- the shell pipe portion 13 includes a first cooling pipe 131 , a second cooling pipe 132 , and a third cooling pipe 133 .
- the first cooling pipe 131 , the second cooling pipe 132 and the third cooling pipe 133 are installed side by side in the first direction D 1 .
- the first cooling pipe 131 , the second cooling pipe 132 and the third cooling pipe 133 are connected in series via the header member 14 .
- the header member 14 is installed on the front surface portion 12 a of the shell plate 12 .
- the header member 14 includes a first header member 141 and a second header member 142 .
- One end of the first cooling pipe 131 is connected to the water inlet portion 10 a , and the other end of the first cooling pipe 131 is connected to the first header member 141 .
- One end of the second cooling pipe 132 is connected to the first header member 141 , and the other end of the second cooling pipe 132 is connected to the second header member 142 .
- One end of the third cooling pipe 133 is connected to the second header member 142 and the other end of the third cooling pipe 133 is connected to the bend pipe 15 disposed on the uppermost side.
- the plurality of fin pipes 11 b are connected to each other in series by the bend pipe 15 .
- the secondary heat exchanger 20 includes the water inlet portion 20 a , the hot water outlet portion 20 b , a heat exchanging portion 21 , a shell plate (circumferential wall portion) 22 , and a header member 23 .
- the heat exchanging portion 21 includes a plurality of first pipes 21 a and a plurality of second pipes 21 b .
- Each of the plurality of first pipes 21 a and the plurality of second pipes 21 b may be formed of SUS (stainless steel).
- the heat exchanging portion 21 is formed so that the combustion gas flows outside each of the plurality of first pipes 21 a and the plurality of second pipes 21 b and the water flows inside the plurality of first pipes 21 a and the plurality of second pipes 21 b.
- Each of the plurality of first pipes 21 a and the plurality of second pipes 21 b is a meandering pipe (meander).
- the plurality of first pipes 21 a and the plurality of second pipes 21 b are alternately folded back in a second direction D 2 orthogonal to the first direction D 1 .
- Each of the plurality of first pipes 21 a and the plurality of second pipes 21 b is formed so that the second direction D 2 is a longitudinal direction.
- the plurality of first pipes 21 a and the plurality of second pipes 21 b are stacked on each other in a third direction D 3 orthogonal to both the first direction D 1 and the second direction D 2 .
- the shell plate 22 surrounds the plurality of first pipes 21 a and the plurality of second pipes 21 b .
- the shell plate 22 includes a front surface portion 22 a , a pair of side surface portions 22 b , and a back surface portion 22 c .
- the front surface portion 22 a , the pair of side surface portions 22 b , and the back surface portion 22 c form a square frame.
- the shell plate 22 has openings at the top and bottom.
- the shell plate 22 can supply the combustion gas to the inside of the shell plate 22 through the upper opening.
- the shell plate 22 allows the combustion gas to be exhausted outside of the shell plate 22 through the lower opening.
- the shell plate 22 includes a main body portion 221 and an expanded portion 222 .
- the expanded portion 222 expands outward from the main body portion 221 .
- the expanded portion 222 is provided on the front surface portion 22 a .
- the expanded portion 222 expands from the main body portion 221 toward a side opposite to the back surface portion 22
- the header member 23 includes a first header member 231 and a second header member 232 .
- the first header member 231 and the second header member 232 are disposed side by side in the first direction D 1 .
- the first header member 231 is disposed farther from the primary heat exchanger 10 than the second header member 232 is.
- the first header member 231 and the second header member 232 are disposed at both ends of the shell plate 22 in the second direction D 2 .
- Each of the first header member 231 and the second header member 232 is configured to extend in the third direction D 3 .
- the water inlet portion 20 a is connected to the first header member 231 .
- the hot water outlet portion 20 b is connected to the second header member 232 .
- each of the plurality of first pipes 21 a and the plurality of second pipes 21 b has a plurality of linear portions 21 c and a plurality of curved portions 21 d .
- Each of the plurality of linear portions 21 c extends in the second direction D 2 .
- Each of the plurality of curved portions 21 d extends in the third direction D 3 .
- the plurality of curved portions 21 d connects the plurality of linear portions 21 c to each other.
- Each of the plurality of first pipes 21 a and the plurality of second pipes 21 b extends in a zigzag manner in the vertical direction (first direction D 1 ) by the plurality of linear portions 21 c being connected to the plurality of curved portions 21 d in series.
- Each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b are disposed not to overlap each other in the vertical direction (the first direction DD.
- Each of the plurality of first pipes 21 a and the plurality of second pipes 21 b may have the same shape.
- each of the plurality of first pipes 21 a and the plurality of second pipes 21 b is connected to the first header member 231
- the other end of each of the plurality of first pipes 21 a and the plurality of second pipes 21 b is connected to the second header member 232 .
- the plurality of first pipes 21 a and the plurality of second pipes 21 b are connected in parallel via the first header member 231 and the second header member 232 .
- each of the plurality of first pipes 21 a and the plurality of second pipes 21 b are arranged in a direction (the third direction D 3 ) orthogonal to the vertical direction (the first direction DD. That is, in the state in which the heat exchange device 200 is installed, the third direction D 3 is a horizontal direction.
- the plurality of first pipes 21 a and the plurality of second pipes 21 b are alternately disposed in parallel in the third direction D 3 .
- the plurality of second pipes 21 b alternately adjoin the plurality of first pipes 21 a in a direction (the third direction D 3 ) intersecting the vertical direction (the first direction DD.
- Each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b may be alternately brought into contact with each other in the third direction D 3 .
- Each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b uniformly comes into contact with the combustion gas indicated by a hollow arrow in FIG. 7 . Therefore, it is minimized that scale (boiler scale) precipitated due to minerals contained in water is locally deposited in each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b . Accordingly, a drift of water flowing through each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b is minimized.
- Each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b are disposed to be displaced from each other in the first direction D 1 .
- Each of the plurality of first pipes 21 a is disposed closer to the primary heat exchanger 10 in the first direction D 1 than each of the plurality of second pipes 21 b .
- Each of the plurality of first pipes 21 a comes into contact with the combustion gas indicated by a hollow arrow in FIG. 7 before each of the plurality of second pipes 21 b.
- each of the plurality of first pipes 21 a and the plurality of second pipes 21 b is disposed in an inner space of the shell plate 22 surrounded by the main body portion 221 and in an inner space of the shell plate 22 expanded due to the expanded portion 222 .
- the plurality of curved portions 21 d of each of the plurality of first pipes 21 a and the plurality of second pipes 21 b are disposed inside the expanded portion 222 .
- the plurality of curved portions 21 d of each of the plurality of first pipes 21 a and the plurality of second pipes 21 b are disposed with a gap between an inner surface of the expanded portion 222 and the curved portions 21 d .
- the expanded portion 222 is disposed between the first header member 231 and the second header member 232 in the first direction D 1 .
- each of the plurality of second pipes 21 b is disposed farther from the primary heat exchanger 10 in the first direction D 1 than each of the plurality of first pipes 21 a .
- each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b is disposed to be displaced from each of the plurality of linear portions 21 c of each of the plurality of first pipes 21 a in the vertical direction (the first direction DD.
- one linear portion 21 c among the plurality of linear portions 21 c in each of the plurality of second pipes 21 b is disposed adjacent to a region sandwiched between the linear portions 21 c adjacent to each other in the vertical direction (the first direction D 1 ) among the plurality of linear portions 21 c in an intersecting direction (the third direction D 3 ) intersecting with the vertical direction (the first direction D 1 ).
- each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b is disposed between the plurality of linear portions 21 c of each of the plurality of first pipes 21 a in the vertical direction (the first direction DD. That is, each of the plurality of linear portions 21 c adjacent to each other in the intersecting direction (the third direction D 3 ) intersecting the vertical direction (the first direction D) of each of the plurality of first pipes 21 a and the plurality of second pipes 21 b are disposed not to overlap each other in the vertical direction (the first direction DD. Also, each of the plurality of fin pipes 11 b extends in the second direction D 2 . Each of the plurality of fin pipes 11 b extends in a direction (the second direction D 2 ) in which the plurality of linear portions 21 c extend.
- each of the plurality of first pipes 21 a and the plurality of second pipes 21 b extends in a zigzag manner in the vertical direction (the first direction D 1 ) by the plurality of linear portions 21 c being connected to the plurality of curved portions 21 d in series. Therefore, when water is discharged from each of the plurality of first pipes 21 a and the plurality of second pipes 21 b , the water drains from an upper side to a lower side due to gravity, and thus drainage performance can be improved.
- the scale is deposited uniformly in each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b .
- each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b is disposed to be displaced from each of the plurality of linear portions 21 c of each of the plurality of first pipes 21 a in the vertical direction (the first direction D 1 ). Therefore, it is possible to reduce flow path resistance when the combustion gas flows in the vertical direction (the first direction D) between each of the plurality of linear portions 21 c of each of the plurality of first pipes 21 a and each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b . Accordingly, a capacity of the blowing device 32 can be reduced, and thus a power consumption and a size of the blowing device 32 can be reduced.
- each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b is disposed between the plurality of linear portions 21 c of each of the plurality of first pipes 21 a in the vertical direction (the first direction DD. Therefore, even if each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b are in contact with each other in the third direction D 3 , the combustion gas is caused to flow between each of the plurality of linear portions 21 c of each of the plurality of first pipes 21 a and each of the plurality of linear portions 21 c of each of the plurality of second pipes 21 b in the vertical direction (the first direction D 1 ).
- each of the plurality of fin pipes 11 b extends in a direction (the second direction D 2 ) in which the plurality of linear portions 21 c extend. Therefore, the combustion gas flows between each of the plurality of first pipes 21 a and each of the plurality of second pipes 21 b along the flow of the combustion gas flowing between the plurality of fin pipes 11 b .
- the flow path resistance when the combustion gas flows from the primary heat exchanger 10 to the secondary heat exchanger 20 in the vertical direction (the first direction D 1 ).
- the plurality of first pipes 21 a and the plurality of second pipes 21 b are disposed in the inner space of the shell plate 22 surrounded by the main body portion 221 and the inner space of the shell plate 22 expanded due to the expanded portion 222 . Therefore, the main body portion 221 can be made smaller than the expanded portion 222 . Also, since the plurality of first pipes 21 a and the plurality of second pipes 21 b are disposed in the inner space of the shell plate 22 expanded due to the expanded portion 222 , a heat transfer area of the plurality of first pipes 21 a and the plurality of second pipes 21 b can be increased as compared with a case in which the expanded portion 222 is not provided.
- the heat source machine 100 of the embodiment includes the above-described heat exchange device 200 and the burner 30 .
- the burner 30 is formed to be able to supply the combustion gas in the order of the primary heat exchanger 10 and the secondary heat exchanger 20 .
- the heat source machine 100 of the embodiment it is possible to provide the heat source machine 100 including the heat exchange device 200 capable of improving the drainage performance and improving the balance in distribution of the water.
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- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
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Abstract
The heat exchange device includes a primary heat exchanger and a secondary heat exchanger. The secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed. The secondary heat exchanger includes a plurality of first pipes and a plurality of second pipes. Each of the plurality of first pipes and the plurality of second pipes extends in a zigzag manner in the vertical direction by a plurality of linear portions being connected to a plurality of curved portions in series. Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction.
Description
- This application claims the priority benefit of Japan application serial no. 2017-248716, filed on Dec. 26, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
- The disclosure relates to a heat exchange device and a heat source machine, and more particularly to a heat exchange device having a primary heat exchanger and a secondary heat exchanger and a heat source machine having the same.
- Conventionally, a heat exchange device including a primary heat exchanger for recovering sensible heat and a secondary heat exchanger for recovering latent heat has been proposed. This heat exchange device is described in, for example, Japanese Laid-open No. 2017-211173 (Patent Document 1). In the heat exchange device described in this publication, the secondary heat exchanger has a plurality of heat absorbing pipes. The plurality of heat absorbing pipes are arranged vertically. Each of the plurality of heat absorbing pipes extends in a zigzag manner in a forward and backward direction.
- In the heat exchange device described in the above publication, since each of the plurality of heat absorbing pipes extends in a zigzag manner in the forward and backward direction (horizontal direction), drainage performance is poor when water is discharged from the heat absorbing pipes. Further, since a combustion gas flowing from the primary heat exchanger into the secondary heat exchanger first comes into contact with the uppermost heat absorbing pipe among the plurality of heat absorbing pipes, the uppermost heat absorbing pipe reaches the highest temperature. Therefore, scale (boiler scale) precipitated due to minerals contained in water tends to accumulate in the uppermost heat absorbing pipes more than in the heat absorbing pipes located below the uppermost heat absorbing pipe. As a result, a balance in distribution of water between the plurality of heat absorbing pipes deteriorates.
- A heat exchange device of an embodiment of the disclosure is a heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas. The heat exchange device includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger is for recovering the sensible heat of the combustion gas. The secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and is for recovering the latent heat of the combustion gas. The secondary heat exchanger includes a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction. Each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series. Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from one of the plurality of linear portions of one of the plurality of first pipes in the vertical direction.
- A heat source machine of an embodiment of the disclosure includes the above-described heat exchange device, and a burner. The burner is disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger. The burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger.
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FIG. 1 a diagram schematically showing a configuration of a heat source machine according to an embodiment of the disclosure. -
FIG. 2 is a perspective view schematically showing a configuration of a heat exchange device according to the embodiment of the disclosure. -
FIG. 3 is a side view showing an internal structure of the heat exchange device according to the embodiment of the disclosure with a broken line. -
FIG. 4 is a perspective view schematically showing a configuration of a secondary heat exchanger according to the embodiment of the disclosure. -
FIG. 5 is an exploded perspective view schematically showing the configuration of the secondary heat exchanger according to the embodiment of the disclosure. -
FIG. 6 is a top view schematically showing the configuration of the secondary heat exchanger according to the embodiment of the disclosure. -
FIG. 7 is a rear view showing the internal structure of the heat exchange device according to an embodiment of the disclosure with a broken line. -
FIG. 8 is a cross-sectional view taken along line VIII-VIII ofFIG. 2 . -
FIG. 9 is a cross-sectional view taken along line IX-IX ofFIG. 2 . - The embodiments of the disclosure provide a heat exchange device capable of improving drainage performance and improving the balance of distribution of water and a heat source machine including the same.
- A heat exchange device of an embodiment of the disclosure is a heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas. The heat exchange device includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger is for recovering the sensible heat of the combustion gas. The secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and is for recovering the latent heat of the combustion gas. The secondary heat exchanger includes a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction. Each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series. Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from one of the plurality of linear portions of one of the plurality of first pipes in the vertical direction.
- According to the heat exchanger of one or some exemplary embodiments of the disclosure, each of the plurality of first pipes and the plurality of second pipes extends in the zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series. Therefore, when water is discharged from each of the plurality of first pipes and the plurality of second pipes, the water drains from an upper side to a lower side due to gravity, and thus drainage performance can be improved. Further, since the secondary heat exchanger is disposed to overlap the primary heat exchanger in the vertical direction in the state in which the heat exchange device is installed, the combustion gas flows into the secondary heat exchanger in the vertical direction. Since the plurality of first pipes and the plurality of second pipes are disposed in a direction intersecting the vertical direction, each of the plurality of first pipes and each of the plurality of second pipes comes into contact with the combustion gas uniformly. Therefore, scale (boiler scale) is deposited uniformly in each of the plurality of first pipes and each of the plurality of second pipes. Therefore, it is possible to prevent a balance in distribution of the water from deteriorating in each of the plurality of first pipes and the plurality of second pipes. That is, the balance in distribution of the water can be improved. Further, each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction. Therefore, it is possible to reduce flow path resistance when the combustion gas flows in the vertical direction between each of the plurality of linear portions of each of the plurality of first pipes and each of the plurality of linear portions of each of the plurality of second pipes.
- In the above-described heat exchanger, the primary heat exchanger includes a plurality of fin pipes. Each of the plurality of fin pipes extends in a direction in which the plurality of linear portions extend. Therefore, the combustion gas flows between each of the plurality of first pipes and each of the plurality of second pipes along a flow of combustion gas flowing between the plurality of fin pipes. Thus, it is possible to reduce the flow path resistance when the combustion gas flows from the primary heat exchanger to the secondary heat exchanger in the vertical direction.
- In the above-described heat exchanger, the secondary heat exchanger comprises a circumferential wall portion surrounding the plurality of first pipes and the plurality of second pipes. The circumferential wall portion comprises a main body portion and an expanded portion which expands outward from the main body portion. Each of the plurality of first pipes and each of the plurality of second pipes are disposed in an inner space of the circumferential wall portion surrounded by the main body portion and an inner space of the circumferential wall portion expanded due to the expanded portion. Therefore, the main body portion can be made smaller than the expanded portion. In addition, since the plurality of first pipes and the plurality of second pipes are disposed in the inner space of the circumferential wall portion expanded due to the expanded portion, a heat transfer area of the plurality of first pipes and the plurality of second pipes can be increased as compared with a case in which the expanded portion is not provided. Thus, it is possible to improve heat exchange efficiency of the plurality of first pipes and the plurality of second pipes while the main body portion is miniaturized.
- A heat source machine of an embodiment of the disclosure includes the above-described heat exchange device, and a burner. The burner is disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger. The burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger. According to the heat source machine according to one or some exemplary embodiments of the disclosure, it is possible to provide a heat source machine including a heat exchange device capable of improving the drainage performance and improving the balance in distribution of the water.
- As described above, according to the embodiments of the disclosure, it is possible to provide a heat exchange device capable of improving drainage performance and improving a balance in distribution of water and a heat source machine including the same.
- Hereinafter, embodiments of the disclosure will be described below with reference to the drawings.
- First, referring to
FIG. 1 , a configuration of aheat source machine 100 according to an embodiment of the disclosure will be described. - As shown in
FIG. 1 , theheat source machine 100 according to the embodiment mainly includes aspark plug 1, a primary heat exchanger (sensible heat recovery heat exchanger) 10, a secondary heat exchanger (latent heat recovery heat exchanger) 20, aburner 30, achamber 31, ablowing device 32, aduct 33, aventuri 34, anorifice 35, agas valve 36, apipe 40, abypass pipe 41, a three-way valve 42, and ahousing 50. Theprimary heat exchanger 10 and thesecondary heat exchanger 20 form aheat exchange device 200. All of the above components except for thehousing 50 are disposed inside thehousing 50. The above-mentioned components are the same as those in the related art except for theheat exchange device 200. - A fuel gas flows to the
venturi 34 through thegas valve 36 and theorifice 35. A mixed gas mixed by theventuri 34 is delivered to theblowing device 32. The blowingdevice 32 is for supplying the mixed gas to theburner 30. The blowingdevice 32 is connected to thechamber 31, and thechamber 31 is connected to theburner 30. The mixed gas supplied from the blowingdevice 32 is delivered to theburner 30 through thechamber 31. Theburner 30 is for generating a heating gas (combustion gas) which is supplied to theprimary heat exchanger 10. The mixed gas blown out from theburner 30 is ignited by thespark plug 1 and becomes a combustion gas. - The
burner 30, theprimary heat exchanger 10, and thesecondary heat exchanger 20 are connected so that a combustion gas sequentially passes through theprimary heat exchanger 10 and thesecondary heat exchanger 20 to exchange heat with hot water. Theburner 30 is disposed on a side of theprimary heat exchanger 10 opposite to thesecondary heat exchanger 20. Theburner 30 is configured to be able to supply the combustion gas in the order of theprimary heat exchanger 10 and thesecondary heat exchanger 20. In the embodiment, theburner 30 is disposed above theprimary heat exchanger 10. In other words, theburner 30 is of a reverse combustion type. Further, theburner 30 may be a premix burner of which a capacity fluctuates over an entire region of a combustion chamber frontage. Theduct 33 is connected to thesecondary heat exchanger 20, and theduct 33 extends to the outside of thehousing 50. Accordingly, the combustion gas which has passed through thesecondary heat exchanger 20 is discharged outside of thehousing 50 through theduct 33. A portion of thepipe 40 on a hot water outlet side from theprimary heat exchanger 10 and thebypass pipe 41 are connected by the three-way valve 42. - Next, a configuration of the
heat exchange device 200 of the embodiment will be described with reference toFIGS. 2 to 9 . As shown inFIGS. 2 and 3 , theheat exchange device 200 is capable of recovering sensible heat and latent heat of the combustion gas. Theheat exchange device 200 has theprimary heat exchanger 10 and thesecondary heat exchanger 20. Theprimary heat exchanger 10 is for recovering the sensible heat of the combustion gas. Thesecondary heat exchanger 20 is for recovering the latent heat of the combustion gas. Theprimary heat exchanger 10 and thesecondary heat exchanger 20 are disposed to overlap in a first direction D1. Thesecondary heat exchanger 20 is disposed to overlap theprimary heat exchanger 10 in a vertical direction in a state in which theheat exchange device 200 is installed. That is, in the state in which theheat exchange device 200 is installed, the first direction D1 is the vertical direction. - The
primary heat exchanger 10 is connected to thesecondary heat exchanger 20. The combustion gas is supplied through an upper opening of theprimary heat exchanger 10, and the combustion gas is exhausted through a lower opening of thesecondary heat exchanger 20. The hot water entering thesecondary heat exchanger 20 from awater inlet portion 20 a of thesecondary heat exchanger 20 exchanges heat with the combustion gas, then exits from a hotwater outlet portion 20 b and enters awater inlet portion 10 a of theprimary heat exchanger 10 via a pipe (not shown). The hot water which has entered thewater inlet portion 10 a of theprimary heat exchanger 10 exchanges heat with the combustion gas and then exits from a hotwater outlet portion 10 b. Thewater inlet portion 10 a is a portion through which the hot water first enters theprimary heat exchanger 10. The hotwater outlet portion 10 b is a portion through which the hot water finally exits from theprimary heat exchanger 10. - The
primary heat exchanger 10 includes thewater inlet portion 10 a, the hotwater outlet portion 10 b, aheat exchanging portion 11, ashell plate 12, ashell pipe portion 13, aheader member 14, and abend pipe 15. Theheat exchanging portion 11 includes a plurality offins 11 a and a plurality offin pipes 11 b. Each of the plurality offins 11 a and the plurality offin pipes 11 b may be formed of SUS (stainless steel). Theheat exchanging portion 11 is configured so that the combustion gas flows outside the plurality offins 11 a and the plurality offin pipes 11 b and water flows inside the plurality offin pipes 11 b. The plurality offins 11 a are stacked on each other. The plurality offin pipes 11 b pass through the plurality offins 11 a. InFIGS. 2 and 3 , for convenience of description, only some of the plurality offins 11 a are illustrated. - The
shell plate 12 surrounds theheat exchanging portion 11. Theshell plate 12 includes afront surface portion 12 a, a pair ofside surface portions 12 b, and aback surface portion 12 c. Thefront surface portion 12 a, the pair ofside surface portions 12 b, and theback surface portion 12 c form a square frame. Theshell plate 12 has openings at the top and bottom. Theshell plate 12 can supply the combustion gas to the inside of theshell plate 12 through the upper opening. Theshell plate 12 can exhaust the combustion gas to the outside of theshell plate 12 through the lower opening. - The
shell pipe portion 13 is disposed along inner surfaces of the pair ofside surface portions 12 b and theback surface portion 12 c of theshell plate 12. Theshell pipe portion 13 includes afirst cooling pipe 131, asecond cooling pipe 132, and athird cooling pipe 133. Thefirst cooling pipe 131, thesecond cooling pipe 132 and thethird cooling pipe 133 are installed side by side in the first direction D1. Thefirst cooling pipe 131, thesecond cooling pipe 132 and thethird cooling pipe 133 are connected in series via theheader member 14. Theheader member 14 is installed on thefront surface portion 12 a of theshell plate 12. Theheader member 14 includes afirst header member 141 and asecond header member 142. - One end of the
first cooling pipe 131 is connected to thewater inlet portion 10 a, and the other end of thefirst cooling pipe 131 is connected to thefirst header member 141. One end of thesecond cooling pipe 132 is connected to thefirst header member 141, and the other end of thesecond cooling pipe 132 is connected to thesecond header member 142. One end of thethird cooling pipe 133 is connected to thesecond header member 142 and the other end of thethird cooling pipe 133 is connected to thebend pipe 15 disposed on the uppermost side. The plurality offin pipes 11 b are connected to each other in series by thebend pipe 15. - As shown in
FIGS. 3 and 4 , thesecondary heat exchanger 20 includes thewater inlet portion 20 a, the hotwater outlet portion 20 b, aheat exchanging portion 21, a shell plate (circumferential wall portion) 22, and aheader member 23. Theheat exchanging portion 21 includes a plurality offirst pipes 21 a and a plurality ofsecond pipes 21 b. Each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b may be formed of SUS (stainless steel). Theheat exchanging portion 21 is formed so that the combustion gas flows outside each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b and the water flows inside the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b. - Each of the plurality of
first pipes 21 a and the plurality ofsecond pipes 21 b is a meandering pipe (meander). The plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are alternately folded back in a second direction D2 orthogonal to the first direction D1. Each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b is formed so that the second direction D2 is a longitudinal direction. The plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are stacked on each other in a third direction D3 orthogonal to both the first direction D1 and the second direction D2. - As shown in
FIGS. 4 and 5 , theshell plate 22 surrounds the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b. Theshell plate 22 includes afront surface portion 22 a, a pair ofside surface portions 22 b, and aback surface portion 22 c. Thefront surface portion 22 a, the pair ofside surface portions 22 b, and theback surface portion 22 c form a square frame. Theshell plate 22 has openings at the top and bottom. Theshell plate 22 can supply the combustion gas to the inside of theshell plate 22 through the upper opening. Theshell plate 22 allows the combustion gas to be exhausted outside of theshell plate 22 through the lower opening. Theshell plate 22 includes amain body portion 221 and an expandedportion 222. The expandedportion 222 expands outward from themain body portion 221. The expandedportion 222 is provided on thefront surface portion 22 a. The expandedportion 222 expands from themain body portion 221 toward a side opposite to theback surface portion 22 c. - The
header member 23 includes afirst header member 231 and asecond header member 232. Thefirst header member 231 and thesecond header member 232 are disposed side by side in the first direction D1. Thefirst header member 231 is disposed farther from theprimary heat exchanger 10 than thesecond header member 232 is. Thefirst header member 231 and thesecond header member 232 are disposed at both ends of theshell plate 22 in the second direction D2. Each of thefirst header member 231 and thesecond header member 232 is configured to extend in the third direction D3. Thewater inlet portion 20 a is connected to thefirst header member 231. The hotwater outlet portion 20 b is connected to thesecond header member 232. - As shown in
FIG. 5 , each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b has a plurality oflinear portions 21 c and a plurality ofcurved portions 21 d. Each of the plurality oflinear portions 21 c extends in the second direction D2. Each of the plurality ofcurved portions 21 d extends in the third direction D3. The plurality ofcurved portions 21 d connects the plurality oflinear portions 21 c to each other. Each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b extends in a zigzag manner in the vertical direction (first direction D1) by the plurality oflinear portions 21 c being connected to the plurality ofcurved portions 21 d in series. Each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b are disposed not to overlap each other in the vertical direction (the first direction DD. Each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b may have the same shape. - As shown in
FIGS. 5 and 6 , one end of each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b is connected to thefirst header member 231, and the other end of each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b is connected to thesecond header member 232. The plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are connected in parallel via thefirst header member 231 and thesecond header member 232. - As shown in
FIGS. 6 and 7 , in a state in which theheat exchange device 200 is installed, each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are arranged in a direction (the third direction D3) orthogonal to the vertical direction (the first direction DD. That is, in the state in which theheat exchange device 200 is installed, the third direction D3 is a horizontal direction. The plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are alternately disposed in parallel in the third direction D3. In the state in which theheat exchange device 200 is installed, the plurality ofsecond pipes 21 b alternately adjoin the plurality offirst pipes 21 a in a direction (the third direction D3) intersecting the vertical direction (the first direction DD. Each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b may be alternately brought into contact with each other in the third direction D3. - Each of the plurality of
first pipes 21 a and each of the plurality ofsecond pipes 21 b uniformly comes into contact with the combustion gas indicated by a hollow arrow inFIG. 7 . Therefore, it is minimized that scale (boiler scale) precipitated due to minerals contained in water is locally deposited in each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b. Accordingly, a drift of water flowing through each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b is minimized. - Each of the plurality of
first pipes 21 a and each of the plurality ofsecond pipes 21 b are disposed to be displaced from each other in the first direction D1. Each of the plurality offirst pipes 21 a is disposed closer to theprimary heat exchanger 10 in the first direction D1 than each of the plurality ofsecond pipes 21 b. Each of the plurality offirst pipes 21 a comes into contact with the combustion gas indicated by a hollow arrow inFIG. 7 before each of the plurality ofsecond pipes 21 b. - As shown in
FIG. 8 , each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b is disposed in an inner space of theshell plate 22 surrounded by themain body portion 221 and in an inner space of theshell plate 22 expanded due to the expandedportion 222. Specifically, the plurality ofcurved portions 21 d of each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed inside the expandedportion 222. The plurality ofcurved portions 21 d of each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed with a gap between an inner surface of the expandedportion 222 and thecurved portions 21 d. The expandedportion 222 is disposed between thefirst header member 231 and thesecond header member 232 in the first direction D1. - As shown in
FIGS. 8 and 9 , each of the plurality ofsecond pipes 21 b is disposed farther from theprimary heat exchanger 10 in the first direction D1 than each of the plurality offirst pipes 21 a. In the state in which theheat exchange device 200 is installed, each of the plurality oflinear portions 21 c of each of the plurality ofsecond pipes 21 b is disposed to be displaced from each of the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a in the vertical direction (the first direction DD. In the plurality offirst pipes 21 a, onelinear portion 21 c among the plurality oflinear portions 21 c in each of the plurality ofsecond pipes 21 b is disposed adjacent to a region sandwiched between thelinear portions 21 c adjacent to each other in the vertical direction (the first direction D1) among the plurality oflinear portions 21 c in an intersecting direction (the third direction D3) intersecting with the vertical direction (the first direction D1). - In the embodiment, each of the plurality of
linear portions 21 c of each of the plurality ofsecond pipes 21 b is disposed between the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a in the vertical direction (the first direction DD. That is, each of the plurality oflinear portions 21 c adjacent to each other in the intersecting direction (the third direction D3) intersecting the vertical direction (the first direction D) of each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed not to overlap each other in the vertical direction (the first direction DD. Also, each of the plurality offin pipes 11 b extends in the second direction D2. Each of the plurality offin pipes 11 b extends in a direction (the second direction D2) in which the plurality oflinear portions 21 c extend. - Next, the operation and effects of the embodiment will be described.
- As shown in
FIG. 8 , according to theheat exchange device 200 of the embodiment, each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b extends in a zigzag manner in the vertical direction (the first direction D1) by the plurality oflinear portions 21 c being connected to the plurality ofcurved portions 21 d in series. Therefore, when water is discharged from each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b, the water drains from an upper side to a lower side due to gravity, and thus drainage performance can be improved. - Further, as shown in
FIG. 9 , in the state in which theheat exchange device 200 is installed, since thesecondary heat exchanger 20 is disposed to overlap theprimary heat exchanger 10 in the vertical direction (the first direction D1), the combustion gas indicated by a solid arrow A inFIG. 9 flows into thesecondary heat exchanger 20 in the vertical direction (the first direction DD. Since the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed in the direction (the third direction D3) intersecting the vertical direction (the first direction D1), each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b comes into contact with the combustion gas uniformly. Therefore, the scale is deposited uniformly in each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b. Thus, it is possible to prevent a balance in distribution of the water from deteriorating in each of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b. That is, the balance in distribution of the water can be improved. Therefore, failure of theheat exchange device 200 can be minimized. - Further, each of the plurality of
linear portions 21 c of each of the plurality ofsecond pipes 21 b is disposed to be displaced from each of the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a in the vertical direction (the first direction D1). Therefore, it is possible to reduce flow path resistance when the combustion gas flows in the vertical direction (the first direction D) between each of the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a and each of the plurality oflinear portions 21 c of each of the plurality ofsecond pipes 21 b. Accordingly, a capacity of theblowing device 32 can be reduced, and thus a power consumption and a size of theblowing device 32 can be reduced. - Further, each of the plurality of
linear portions 21 c of each of the plurality ofsecond pipes 21 b is disposed between the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a in the vertical direction (the first direction DD. Therefore, even if each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b are in contact with each other in the third direction D3, the combustion gas is caused to flow between each of the plurality oflinear portions 21 c of each of the plurality offirst pipes 21 a and each of the plurality oflinear portions 21 c of each of the plurality ofsecond pipes 21 b in the vertical direction (the first direction D1). - As shown in
FIG. 8 , in theheat exchange device 200 of the embodiment, each of the plurality offin pipes 11 b extends in a direction (the second direction D2) in which the plurality oflinear portions 21 c extend. Therefore, the combustion gas flows between each of the plurality offirst pipes 21 a and each of the plurality ofsecond pipes 21 b along the flow of the combustion gas flowing between the plurality offin pipes 11 b. Thus, it is possible to reduce the flow path resistance when the combustion gas flows from theprimary heat exchanger 10 to thesecondary heat exchanger 20 in the vertical direction (the first direction D1). - As shown in
FIG. 8 , in theheat exchange device 200 of the embodiment, the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed in the inner space of theshell plate 22 surrounded by themain body portion 221 and the inner space of theshell plate 22 expanded due to the expandedportion 222. Therefore, themain body portion 221 can be made smaller than the expandedportion 222. Also, since the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b are disposed in the inner space of theshell plate 22 expanded due to the expandedportion 222, a heat transfer area of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b can be increased as compared with a case in which the expandedportion 222 is not provided. In the expandedportion 222, since heat exchange is performed between the combustion gas indicated by a solid arrow A inFIG. 8 and the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b, it is possible to improve a heat exchange amount. Therefore, it is possible to improve heat exchange efficiency of the plurality offirst pipes 21 a and the plurality ofsecond pipes 21 b while themain body portion 221 is miniaturized. - As shown in
FIG. 1 , theheat source machine 100 of the embodiment includes the above-describedheat exchange device 200 and theburner 30. Theburner 30 is formed to be able to supply the combustion gas in the order of theprimary heat exchanger 10 and thesecondary heat exchanger 20. According to theheat source machine 100 of the embodiment, it is possible to provide theheat source machine 100 including theheat exchange device 200 capable of improving the drainage performance and improving the balance in distribution of the water. - It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.
Claims (4)
1. A heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas, comprising:
a primary heat exchanger which recovers the sensible heat of the combustion gas; and
a secondary heat exchanger which is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and which recovers the latent heat of the combustion gas,
wherein the secondary heat exchanger comprises a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction,
each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series, and
each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction.
2. The heat exchange device according to claim 1 , wherein the primary heat exchanger comprises a plurality of fin pipes, and
each of the plurality of fin pipes extends in a direction in which the plurality of linear portions extend.
3. The heat exchange device according to claim 1 , wherein the secondary heat exchanger comprises a circumferential wall portion surrounding the plurality of first pipes and the plurality of second pipes,
the circumferential wall portion comprises a main body portion and an expanded portion which expands outward from the main body portion, and
each of the plurality of first pipes and each of the plurality of second pipes are disposed in an inner space of the circumferential wall portion surrounded by the main body portion and an inner space of the circumferential wall portion expanded due to the expanded portion.
4. A heat source machine, comprising:
the heat exchange device according to claim 1 ; and
a burner disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger,
wherein the burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2017248716A JP7052341B2 (en) | 2017-12-26 | 2017-12-26 | Heat exchanger and heat source machine |
JP2017-248716 | 2017-12-26 |
Publications (1)
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US20190195563A1 true US20190195563A1 (en) | 2019-06-27 |
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Family Applications (1)
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US16/208,585 Abandoned US20190195563A1 (en) | 2017-12-26 | 2018-12-04 | Heat exchange device and heat source machine |
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US (1) | US20190195563A1 (en) |
JP (1) | JP7052341B2 (en) |
CN (1) | CN109959169B (en) |
Cited By (7)
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USD904588S1 (en) * | 2019-08-22 | 2020-12-08 | Noritz Corporation | Heat exchanger for water heater |
USD904589S1 (en) * | 2019-08-22 | 2020-12-08 | Noritz Corporation | Heat exchanger for water heater |
USD904587S1 (en) * | 2019-08-22 | 2020-12-08 | Noritz Corporation | Heat exchanger for water heater |
US10890356B2 (en) * | 2018-01-24 | 2021-01-12 | Noritz Corporation | Heat exchange device and heat source machine |
USD916257S1 (en) * | 2019-08-22 | 2021-04-13 | Noritz Corporation | Heat exchanger for water heater |
US11293702B2 (en) * | 2018-12-26 | 2022-04-05 | Noritz Corporation | Heat exchanger and hot water apparatus |
US11454421B2 (en) | 2019-12-24 | 2022-09-27 | Noritz Corporation | Heat exchanger and water heating apparatus |
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CN110756607A (en) * | 2019-11-18 | 2020-02-07 | 贵州航天南海科技有限责任公司 | Internal circulation water cooling device for wire drawing machine |
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US10890356B2 (en) * | 2018-01-24 | 2021-01-12 | Noritz Corporation | Heat exchange device and heat source machine |
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USD904587S1 (en) * | 2019-08-22 | 2020-12-08 | Noritz Corporation | Heat exchanger for water heater |
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Also Published As
Publication number | Publication date |
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CN109959169B (en) | 2022-04-12 |
CN109959169A (en) | 2019-07-02 |
JP2019113280A (en) | 2019-07-11 |
JP7052341B2 (en) | 2022-04-12 |
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