WO2015182526A1 - 排気熱回収器及びその製造方法 - Google Patents

排気熱回収器及びその製造方法 Download PDF

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Publication number
WO2015182526A1
WO2015182526A1 PCT/JP2015/064805 JP2015064805W WO2015182526A1 WO 2015182526 A1 WO2015182526 A1 WO 2015182526A1 JP 2015064805 W JP2015064805 W JP 2015064805W WO 2015182526 A1 WO2015182526 A1 WO 2015182526A1
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WIPO (PCT)
Prior art keywords
heat recovery
exhaust heat
inner cylinder
fluid passage
manufacturing
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PCT/JP2015/064805
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English (en)
French (fr)
Inventor
洋平 一柳
聡 北守
Original Assignee
カルソニックカンセイ株式会社
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Filing date
Publication date
Application filed by カルソニックカンセイ株式会社 filed Critical カルソニックカンセイ株式会社
Priority to CN201580027794.3A priority Critical patent/CN106461341A/zh
Priority to EP15799736.2A priority patent/EP3150949A4/en
Priority to US15/314,054 priority patent/US20170191401A1/en
Publication of WO2015182526A1 publication Critical patent/WO2015182526A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • 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
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • 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
    • 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
    • F28D7/10—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 the conduits being arranged one within the other, e.g. concentrically
    • 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
    • F28D7/10—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 the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—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 the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust gas heat recovery device for recovering exhaust heat of an internal combustion engine, and a method of manufacturing the same.
  • Patent Document 1 discloses an exhaust heat recovery device 100 shown in FIG.
  • the exhaust heat recovery device 100 includes an inner cylinder 101 and an outer cylinder 102 covering the inner cylinder 101.
  • a first fluid passage (first fluid passage) 103 through which a first fluid (heat source) flows is formed.
  • a heat recovery member (heat recovery member) 105 for recovering exhaust heat is disposed in the first fluid passage 103.
  • the outer cylinder 102 has an inner cylinder holding portion 107 for holding the inner cylinder 101, an outer circumferential wall 109 to which the pipe 113 is connected, and a space between the outer cylinder 102 and the inner cylinder 101. And a second fluid passage 111 formed in the The second fluid flows into the second fluid passage 111 through one of the pipes 113 and flows out of the second fluid passage 111 through the other of the pipes 113. Since the inner cylinder 101 is inserted into the inside of the outer cylinder 102, when the first fluid flows in the first fluid passage 103, the heat of the first fluid is recovered by the second fluid flowing in the second fluid passage 111. Be done.
  • the outer cylinder 102 In the exhaust heat recovery apparatus 100 shown in FIG. 8, the outer cylinder 102 must be manufactured by extrusion molding, spinning molding, or the like. For this reason, it takes time to manufacture the outer cylinder 102 and its manufacturing cost is high, and the outer cylinder 102 is not suitable for mass production.
  • An object of the present invention is to provide an exhaust heat recovery apparatus which can be easily manufactured and whose manufacturing cost can be reduced, and a method of manufacturing the same.
  • a first feature of the present invention is an exhaust heat recovery device, which comprises an inner cylinder, a first fluid passage formed inside the inner cylinder, through which a first fluid flows, and at least two divided bodies.
  • An exhaust heat recovery apparatus is provided, comprising: an outer cylinder formed to cover an inner cylinder; and a second fluid passage formed between the inner cylinder and the outer cylinder, through which a second fluid flows. .
  • a second feature of the present invention is a method of manufacturing an exhaust heat recovery device, wherein the exhaust heat recovery device includes an inner cylinder and a first fluid passage through which a first fluid flows, which is formed inside the inner cylinder. And an outer cylinder formed to cover the inner cylinder by at least two divided bodies, and a second fluid passage formed between the inner cylinder and the outer cylinder, through which the second fluid flows. And the manufacturing method forms the at least two divided bodies, joins the at least two divided bodies at a butt portion to form the outer cylinder, and the space is formed between the inner cylinder and the outer cylinder.
  • a method of manufacturing an exhaust heat recovery device wherein the outer cylinder is attached to the inner cylinder so as to form a second fluid passage.
  • the outer cylinder is formed so as to cover the inner cylinder, and at least two divided bodies forming the outer cylinder can be easily formed by pressing or the like. Therefore, the exhaust heat recovery device can be easily manufactured at low manufacturing cost.
  • FIG. 1 is a perspective view of a prior art exhaust heat recovery unit.
  • the exhaust heat recovery device 1 includes an inner cylinder 2 through which the first fluid flows and an outer cylinder 3 (see FIG. 2) covering the inner cylinder 2.
  • the outer cylinder 3 is composed of two divided bodies 9 and 11.
  • Inside the inner cylinder 2 is formed a first fluid passage 5 through which a first fluid flows.
  • the first fluid passage 5 contains a heat recovery member 7 that recovers the heat of the first fluid.
  • the heat recovery member 7 has a honeycomb structure, or a structure in which tubes, fins, or the like are stacked in order to flow the first fluid.
  • the heat recovery member 7 may have a configuration that can recover the heat of the first fluid (store heat and exchange heat with the second fluid through the inner cylinder 2).
  • the outer cylinder 3 is comprised by the 1st division body 9 and the 2nd division body 11 which were formed from the plate member [sheet member], as FIG.2 and FIG.3 shows.
  • a second fluid passage 13 through which the second fluid flows is formed between the inner periphery of the outer cylinder 3 and the outer periphery of the inner cylinder 2.
  • An inner cylinder holding portion (stepped neck) 15 for holding the inner cylinder 2 is formed on one side (first divided body 9) of the outer cylinder 3. Moreover, the inner cylinder holding part 23 holding the inner cylinder 2 is formed also in the other side (2nd division body 11) of the outer cylinder 3. As shown in FIG.
  • the portions other than the inner cylinder holding portions 15 and 23 of the outer cylinder 3 (the first divided body 9 and the second divided body 11) form an outer peripheral wall 17 having an inner diameter larger than that of the inner cylinder 2.
  • a pipe connection hole 19 to which a pipe (not shown) is connected is formed in the outer peripheral wall 17 on the first divided body 9 side.
  • a flange (abutment portion) 21 is extended outward at an end portion (joint portion with the second divided body 11) opposite to the inner cylinder holding portion 15 of the first divided body 9.
  • a pipe connection hole 27 to which a pipe (not shown) is connected is formed in the outer peripheral wall 17 on the second divided body 11 side.
  • a flange (abutment portion) 29 is extended outward at an end portion (joint portion with the first divided body 11) opposite to the inner cylinder holding portion 23 of the second divided body 11 as well.
  • the inner diameters of the inner cylinder holding portions 15 and 23 are substantially the same as the outer diameter of the inner cylinder 2.
  • the pipe connection holes 19 and 27 are provided in the first divided body 9 and the second divided body 11, respectively, but may be provided in only one of the first divided body 9 and the second divided body 11.
  • a second fluid passage 13 in which a second fluid flows is formed between the inner cylinder 2 through which the first fluid flows and the outer cylinder 3 provided to cover the inner cylinder 2. ing.
  • the second fluid flows into the second fluid passage 13 through one of the pipe connection holes 19 and 27 and is discharged from the second fluid passage 13 through the other of them.
  • the heat of the first fluid is recovered by the second fluid flowing in the second fluid passage 13.
  • the heat recovery member 7 is accommodated in the first fluid passage 5 of the inner cylinder 2 (inner cylinder auxiliary assembling [sub-assembling] process).
  • the first divided body 9 and the second divided body 11 constituting the outer cylinder 3 are formed by press processing or the like (a divided body forming step).
  • the flanges (abutment portions) 21 and 29 are butted (interacted) to each other and joined by welding or the like to form the outer cylinder 3 (outer cylinder auxiliary assembling step).
  • the inner cylinder 2 is inserted into the outer cylinder 3 and the inner cylinder holding portions 15 and 23 are fixed to the inner cylinder 2 by welding or the like.
  • the second fluid is interposed between the inner cylinder 2 and the outer cylinder 3
  • the passage 13 is formed, and the exhaust heat recovery device 1 is completed (final assembly process).
  • the second fluid flowing in the second fluid passage 13 causes the first fluid passage 5 to flow
  • the heat of one fluid can be recovered (heat exchange can be performed between the first fluid and the second fluid).
  • the first divided body 9 and the second divided body 11 constituting the outer cylinder 3 are respectively formed of plate members, the first divided body 9 and the second divided body 11 can be easily manufactured by press processing or the like. Therefore, the exhaust heat recovery device 1 can be easily mass-produced at low cost.
  • pipes (20 and 28) are formed on the flange (abutment portion) 21 of the first divided body 9 and the flange (abutted portion) 29 of the second divided body 11. It is done. Piping (20 and 28) formed in the 1st division body 9 and the 2nd division body 11 has semicircle shape, respectively.
  • a pipe 20 of the first divided body 9 and a pipe 28 of the second divided body 11 form a cylinder. Shaped pipes are formed.
  • the first divided body 9 and the second divided body 11 can be formed by pressing or the like, and at the same time the pipes (20 and 28) can be formed. . Moreover, the process of forming the pipe connection hole can be omitted, and the exhaust heat recovery device 1 can be mass-produced more efficiently.
  • the outer cylinder 3 ⁇ / b> A is divided in parallel to the axial direction of the inner cylinder 2.
  • a flange (abutment portion) 21A is formed at an end (a joint portion with the second divided body 11A) of the first divided body 9A (the inner cylinder holding portion 15A and the outer peripheral wall 17A).
  • a flange (abutment portion) 29A is formed at an end (a joint portion with the first divided body 9A) of the second divided body 11A (the inner cylinder holding portion 23A and the outer peripheral wall 25A).
  • two pipe connection holes 19A are formed in the outer peripheral wall 17A of the first divided body 9A.
  • the pipe connection hole 19A is not formed in the outer peripheral wall 25A of the second divided body 11A. Also in the present embodiment, the flange 21A of the first divided body 9A and the flange 29A of the second divided body 11A are mutually interviewed and joined by welding or the like to form the outer cylinder 3A.
  • the present invention is not limited to the above embodiment.
  • the outer cylinder 3 (3A) was divided into 2 by the 1st division body 9 (9A) and the 2nd division body 11 (11A), you may be divided into three or more. However, as the number of divisions increases, the number of parts increases and the manufacturing becomes complicated, so the division into two is most preferable.
  • the 1st fluid was a heat source
  • a 2nd fluid may be a heat source.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust Silencers (AREA)

Abstract

　排気熱回収器は、内筒と、前記内筒の内部に形成された、第１流体が流れる第１流体通路と、少なくとも二つの分割体によって、前記内筒を覆うように形成された外筒と、前記内筒と前記外筒との間に形成された、第２流体が流れる第２流体通路とを備えている。

Description

排気熱回収器及びその製造方法
　本発明は、内燃機関の排気熱を回収する排気熱回収器[exhaust gas heat recovery device]と、その製造方法とに関する。
　内燃機関の排気熱を回収する排気熱回収器は種々提案されている。例えば、下記特許文献１には、図８に示される排気熱回収器１００が開示されている。排気熱回収器１００は、内筒[inner cylinder]１０１と、内筒１０１を覆う[surround]外筒[outer cylinder]１０２とを備えている。内筒１０１内には、第１流体（熱源）が流れる第１流体通路[first fluid passage]１０３が形成されている。第１流体通路１０３内には、排気熱を回収するための熱回収部材[heat recovery member]１０５が配置されている。
　外筒１０２は、内筒１０１を保持する内筒保持部[inner cylinder holding portions]１０７と、配管１１３が接続される外周壁[outer circumferential wall]１０９と、外筒１０２と内筒１０１との間に形成される第２流体通路１１１とを備えている。第２流体は、配管１１３の一方を通って第２流体通路１１１に流入し、配管１１３の他方を通って第２流体通路１１１から流出する。外筒１０２の内部に内筒１０１が挿通されているので、第１流体が第１流体通路１０３内を流れるときに、第２流体通路１１１内を流れる第２流体によって第１流体の熱が回収される。
日本国特開２０１２－３７１６５号公報
　図８に示される排気熱回収器１００では、外筒１０２を押し出し成形やスピニング成形等によって製造しなければならない。このため、外筒１０２の製造には時間が掛り、かつ、その製造コストも高く、外筒１０２は量産には適していない。
　本発明の目的は、製造が容易で、かつ、製造コストも低減できる排気熱回収器と、その製造方法とを提供することである。
　本発明の第１の特徴は、排気熱回収器であって、内筒と、前記内筒の内部に形成された、第１流体が流れる第１流体通路と、少なくとも二つの分割体によって、前記内筒を覆うように形成された外筒と、前記内筒と前記外筒との間に形成された、第２流体が流れる第２流体通路とを備えている、排気熱回収器を提供する。
　本発明の第２の特徴は、排気熱回収器の製造方法であって、前記排気熱回収器が、内筒と、前記内筒の内部に形成された、第１流体が流れる第１流体通路と、少なくとも二つの分割体によって、前記内筒を覆うように形成された外筒と、前記内筒と前記外筒との間に形成された、第２流体が流れる第２流体通路とを備えており、前記製造方法が、前記少なくとも二つの分割体を形成し、前記少なくとも二つの分割体を突合せ部で接合して前記外筒を形成し、前記内筒と前記外筒との間に前記第２流体通路が形成されるように、前記外筒を前記内筒に取り付ける、排気熱回収器の製造方法を提供する。
　上記第１及び第２の特徴によれば、内筒を覆うように外筒が形成され、かつ、外筒を形成する少なくとも二つの分割体をプレス加工等によって容易に形成できる。このため、低製造コストで容易に上記排気熱回収器を製造できる。
第１実施形態に係る排気熱回収器における外筒の斜視図である。 上記外筒の分解斜視図である。 上記排気熱回収器の断面図である。 第２実施形態に係る排気熱回収器における外筒の斜視図である。 上記排気熱回収器の断面図である。 第３実施形態に係る排気熱回収器における外筒の斜視図である。 上記排気熱回収器の断面図である。 従来技術の排気熱回収器の斜視図である。
　〔第１実施形態〕
　本実施形態の排気熱回収器１及びその製造方法について、図１～図３を参照しつつ説明する。
　排気熱回収器１は、図１に示されるように、第１流体が流れる内筒２と、内筒２を覆う外筒３（図２参照）とを備えている。外筒３は、２つの分割体[divided bodies]９及び１１で構成されている。内筒２の内部には第１流体が流れる第１流体通路５が形成されている。第１流体通路５には、第１流体の熱を回収する熱回収部材７が収容されている。熱回収部材７は、第１流体を流すためにハニカム構造や、チューブ又はフィン等を積層した構造を有している。熱回収部材７は、第１流体の熱を回収（蓄熱して内筒２を通して第２流体と熱交換）できる構成を有していればよい。
　外筒３は、図２及び図３に示されるように、板部材[sheet member]から形成された第１分割体９及び第２分割体１１とで構成されている。外筒３の内周と内筒２の外周との間には、第２流体が流れる第２流体通路１３が形成されている。
　外筒３の一側（第１分割体９）には、内筒２を保持する内筒保持部（段付首部[stepped neck]）１５が形成されている。また、外筒３の他側（第２分割体１１）にも、内筒２を保持する内筒保持部２３が形成されている。外筒３（第１分割体９及び第２分割体１１）の内筒保持部１５及び２３以外の部分は、内筒２よりも内径の大きい外周壁１７を形成している。第１分割体９側の外周壁１７には、配管（図示せず）が接続される配管接続孔１９が形成されている。第１分割体９の内筒保持部１５とは反対側の端部（第２分割体１１との接合部）には、フランジ（突合せ部）２１が外方に向けて延設されている。同様に、第２分割体１１側の外周壁１７にも、配管（図示せず）が接続される配管接続孔２７が形成されている。第２分割体１１の内筒保持部２３とは反対側の端部（第１分割体１１との接合部）にも、フランジ（突合せ部）２９が外方に向けて延設されている。
　なお、内筒保持部１５及び２３の内径は、内筒２の外径とほぼ同じである。また、配管接続孔１９及び２７は、第１分割体９及び第２分割体１１にそれぞれ設けられているが、第１分割体９及び第２分割体１１の一方のみに設けられてもよい。
　図１に示されるように、第１流体が流れる内筒２と、内筒２を覆うように設けられた外筒３との間には、第２流体が流れる第２流体通路１３が形成されている。第２流体は、配管接続孔１９及び２７の一方を通って第２流体通路１３に流入し、それらの他方を通って第２流体通路１３から吐出される。第１流体が第１流体通路５を流れるときに、第２流体通路１３内を流れる第２流体によって、第１流体の熱が回収される。
　次に、排気熱回収器１の製造方法について説明する。まず、内筒２の第１流体通路５内に熱回収部材７が収容される（内筒補助組み付け[sub-assembling]工程）。次に、外筒３を構成する第１分割体９及び第２分割体１１がプレス加工等によって形成される（分割体形成工程）。続いて、フランジ（突合せ部）２１及び２９が互いに突合わされて（面接されて）溶接等で接合されて、外筒３が形成される（外筒補助組み付け工程）。最後に、内筒２が外筒３に挿通されて内筒保持部１５及び２３が内筒２に溶接などによって固定される、この結果、内筒２と外筒３との間に第２流体通路１３が形成され、排気熱回収器１が完成される（最終組み付け[final assembling]工程）。
　本実施形態によれば、内筒２を覆うように分割体９及び１１（外筒３）が形成されているので、第２流体通路１３を流れる第２流体によって第１流体通路５を流れる第１流体の熱を回収することができる（第１流体と第２流体との間で熱交換できる）。また、外筒３を構成する第１分割体９及び第２分割体１１がそれぞれ板部材から形成されるので、第１分割体９及び第２分割体１１をプレス加工等によって容易に製造できる。従って、排気熱回収器１を低コストで容易に量産することができる。
　〔第２実施形態〕
　本実施形態の排気熱回収器１及びその製造方法について、図４及び図５を参照しつつ説明する。なお、上述した第１実施形態と同一又は同等の構成には、同一の参照符号を付して、それらの詳しい説明は省略する。
　本実施形態では、図４及び図５に示されるように、第１分割体９のフランジ（突合せ部）２１及び第２分割体１１のフランジ（突合せ部）２９に配管（２０及び２８）が形成されている。第１分割体９及び第２分割体１１に形成された配管（２０及び２８）は、それぞれ半円形状を有している。第１分割体９のフランジ２１と第２分割体１１のフランジ２９とを突合わせて（面接させて）接合すると、第１分割体９の配管２０と第２分割体１１の配管２８とによって円筒状の配管が形成される。
　本実施形態によれば、第１実施形態による上述した効果に加えて、プレス加工等によって第１分割体９及び第２分割体１１を形成すると同時に配管（２０及び２８）も形成することができる。また、配管接続孔を形成する工程を省くことができ、より効率的に排気熱回収器１を量産することができる。
　〔第３実施形態〕
　本実施形態の排気熱回収器１及びその製造方法について、図６及び図７を参照しつつ説明する。なお、上述した第１及び第２実施形態と同一又は同等の構成には、同一の参照符号を付して、それらの詳しい説明は省略する。
　本実施形態では、図５及び図６に示されるように、外筒３Ａが内筒２の軸方向に平行に分割されている。図６に示されるように、第１分割体９Ａ（内筒保持部１５Ａ及び外周壁１７Ａ）の端部（第２分割体１１Ａとの接合部）には、フランジ（突合せ部）２１Ａが形成されている。同様に、第２分割体１１Ａ（内筒保持部２３Ａ及び外周壁２５Ａ）の端部（第１分割体９Ａとの接合部）にも、フランジ（突合せ部）２９Ａが形成されている。また、第１分割体９Ａの外周壁１７Ａには、二つの配管接続孔１９Ａが形成されている。第２分割体１１Ａの外周壁２５Ａには、配管接続孔１９Ａは形成されていない。本実施形態でも、第１分割体９Ａのフランジ２１Ａと第２分割体１１Ａのフランジ２９Ａとが互いに面接されて溶接等で接合されて、外筒３Ａが形成される。
　本実施形態によれば、第１実施形態による上述した効果と同じ効果がもたらされる。
　本発明は上記実施形態に限定されない。上記実施形態では、外筒３（３Ａ）は、第１分割体９（９Ａ）及び第２分割体１１（１１Ａ）に二分割されたが、３つ以上に分割されてもよい。ただし、分割数が増えると、部品数が増え、かつ、製造が複雑になるので、二つに分割されるのが最も好ましい。また、上記実施形態では、第１流体が熱源であったが、第２流体が熱源であってもよい。

Claims (8)

  1. 　排気熱回収器であって、
    　内筒と、
    　前記内筒の内部に形成された、第１流体が流れる第１流体通路と、
    　少なくとも二つの分割体によって、前記内筒を覆うように形成された外筒と、
    　前記内筒と前記外筒との間に形成された、第２流体が流れる第２流体通路とを備えている、排気熱回収器。
  2. 　請求項１に記載の排気熱回収器であって、
    　前記少なくとも二つの分割体のそれぞれは、プレス加工によって形成されている、排気熱回収器。
  3. 　請求項１又は２に記載の排気熱回収器であって、
    　前記少なくとも二つの分割体のそれぞれは、前記少なくとも二つの分割体の隣接する残りとの接合部に突合せ部を有している、排気熱回収器。
  4. 　請求項３に記載の排気熱回収器であって、
    　前記第２流体通路に前記第２流体を流入及び流出させる一対の配管が、前記少なくとも二つの分割体の前記突合せ部に形成されている、排気熱回収器。
  5. 　請求項１～４の何れか一項に記載の排気熱回収器であって、
    　前記内筒の内部で、かつ、前記第２流体通路の内側の位置に、蓄熱する熱回収部材をさらに備えている、排気熱回収器。
  6. 　排気熱回収器の製造方法であって、
    　前記排気熱回収器が、内筒と、前記内筒の内部に形成された、第１流体が流れる第１流体通路と、少なくとも二つの分割体によって、前記内筒を覆うように形成された外筒と、前記内筒と前記外筒との間に形成された、第２流体が流れる第２流体通路とを備えており、
    　前記製造方法が、
    　前記少なくとも二つの分割体を形成し、
    　前記少なくとも二つの分割体を突合せ部で接合して前記外筒を形成し、
    　前記内筒と前記外筒との間に前記第２流体通路が形成されるように、前記外筒を前記内筒に取り付ける、排気熱回収器の製造方法。
  7. 　請求項６に記載の排気熱回収器の製造方法であって、
    　前記少なくとも二つの分割体のそれぞれが、プレス加工によって形成される、排気熱回収器の製造方法。
  8. 　請求項６又は７に記載の排気熱回収器の製造方法であって、
    　前記内筒の内部で、かつ、前記第２流体通路の内側の位置に、蓄熱する熱回収部材をさらに取り付ける、排気熱回収器の製造方法。
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