WO2013005541A1 - Waste heat recovery device - Google Patents

Waste heat recovery device Download PDF

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Publication number
WO2013005541A1
WO2013005541A1 PCT/JP2012/065101 JP2012065101W WO2013005541A1 WO 2013005541 A1 WO2013005541 A1 WO 2013005541A1 JP 2012065101 W JP2012065101 W JP 2012065101W WO 2013005541 A1 WO2013005541 A1 WO 2013005541A1
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WO
WIPO (PCT)
Prior art keywords
heat recovery
case
heat exchanger
exhaust
recovery device
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PCT/JP2012/065101
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French (fr)
Japanese (ja)
Inventor
史朗 中嶋
正義 保田
盛義 角倉
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カルソニックカンセイ株式会社
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Publication of WO2013005541A1 publication Critical patent/WO2013005541A1/en

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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
    • 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 heat recovery device that recovers heat from engine exhaust.
  • Heat is recovered from the exhaust of the engine using an exhaust heat recovery unit (heat exchanger), and the recovered heat is used to warm up the engine, or the heat is converted into power to assist engine output and drive the generator.
  • an exhaust heat recovery unit heat exchanger
  • the recovered heat is used to warm up the engine, or the heat is converted into power to assist engine output and drive the generator.
  • a technique for improving the efficiency of the engine is known.
  • an exhaust heat recovery unit bypasses the heat exchanger that performs heat exchange between exhaust gas and water, and the heat exchanger when heat recovery is unnecessary or undesirable.
  • the bypass pipe is provided in parallel, and a flapper is provided on the upstream side of these so as to select which of the heat exchanger and the bypass pipe the exhaust gas flows.
  • the degree of thermal expansion differs greatly between the heat exchanger cooled by water and the bypass pipe exposed to high-temperature exhaust at around 600 ° C. When these are joined at both ends, a large thermal stress is produced at the joint. Will occur. Since the magnitude of the thermal stress varies depending on the operating state of the exhaust heat recovery device, fatigue progresses in the stress concentration portion, which shortens the life of the exhaust heat recovery device.
  • the present invention has been made in view of such technical problems, and an object thereof is to reduce the thermal stress inside the exhaust heat recovery device and extend the life of the exhaust heat recovery device.
  • a heat exchanger that recovers heat of engine exhaust and a bypass pipe that bypasses the heat exchanger are provided in parallel in the case, and the engine is provided by a flapper that is disposed in the case.
  • An exhaust heat recovery unit for selectively flowing the exhaust gas to either the heat exchanger or the bypass pipe, wherein the heat exchanger is an inlet for supplying a medium for heat exchange with the exhaust gas to the heat exchanger.
  • a heat recovery unit is provided.
  • the number of joints where thermal stress is generated is reduced, and a reduction in the life of the exhaust heat recovery device can be suppressed.
  • FIG. 1 is an overall configuration diagram of the exhaust heat recovery device.
  • FIG. 2 is a longitudinal sectional view of the exhaust heat recovery device.
  • FIG. 3 is a cross-sectional view of the exhaust heat recovery device taken along line III-III in FIG.
  • FIG. 4 is a partially enlarged view in which the portion A of FIG. 2 is enlarged.
  • FIG. 5 is a partially enlarged view in which the portion B in FIG. 2 is enlarged.
  • FIG. 6 is a diagram showing a partial modification.
  • FIG. 1 is an overall configuration diagram of an exhaust heat recovery device according to an embodiment of the present invention
  • FIG. 2 is a longitudinal sectional view of the exhaust heat recovery device
  • FIG. 3 is an exhaust heat recovery device taken along line III-III in FIG. It is the cross-sectional view cut
  • the exhaust heat recovery device 100 includes a case body 1, an upstream adapter 2 connected to the upstream opening of the case body 1, a downstream adapter 3 connected to the downstream opening of the case body 1, and an upstream adapter 2.
  • a flapper 4 disposed inside, a heat exchanger 5 and a bypass pipe 6 disposed in the case body 1, and the orientation shown in the drawing (the heat exchanger 5 so that the lower side of the case body 1 is exposed to the outside air. In the direction in which the bypass pipe 6 is on the lower side and the bypass pipe 6 on the lower side).
  • the case body 1 is configured by combining a box-shaped upper case 11 opened on the upstream side, downstream side and lower side, and a lower case 12 having a semicircular cross section opened on the upstream side, downstream side and upper side. ( Figure 3).
  • the upstream adapter 2 has a flange 21 on the upstream side, and is connected to the exhaust pipe of the engine via the flange 21.
  • the flapper 4 is provided in the center of the upstream adapter 2.
  • the rotation shaft 41 of the flapper 4 extends in a direction orthogonal to the flow of exhaust gas, and penetrates the upstream adapter 2.
  • the position of the flapper 4 is changed to a position where the exhaust gas flows into the heat exchanger 5 (a position where the inlet of the bypass pipe 6 is closed, hereinafter referred to as “recovery position”).
  • the position can be switched between a position where the exhaust gas flows into the bypass pipe 6 (a position where the inlet of the heat exchanger 5 is closed, hereinafter referred to as a “bypass position”).
  • flapper 4 The initial position of flapper 4 (the position when starting and stopping the engine) is the bypass position.
  • the downstream adapter 3 has a flange 31 on the downstream side, and is connected to the exhaust pipe of the engine via the flange 31.
  • the heat exchanger 5 has an exhaust passage 51 through which engine exhaust flows and a cooling water passage 52 through which engine cooling water flows (FIG. 3).
  • An inlet pipe 53 extending upward from the upper surface of the heat exchanger 5 and an outlet pipe 54 extending laterally from the side surface of the heat exchanger 5 are connected to the cooling water passage 52.
  • the heat exchanger 5 is disposed inside the upper case 11.
  • the heat exchanger 5 and the upper case 11 are joined by joining the inlet pipe 53 and the outlet pipe 54 to the upper case 11 via the boss 55.
  • an air layer as a heat insulating layer is formed between the heat exchanger 5 and the upper case 11 except for two joining positions.
  • FIG. 4 is a partially enlarged view in which the portion A in FIG. 2 is enlarged.
  • hatched parts indicate welded parts.
  • a boss 55 is joined to the end of the inlet pipe 53 by welding, and the boss 55 is joined to the upper case 11 and the upper surface of the heat exchanger 5 by welding, whereby the inlet pipe 53 is joined to the upper case 11. To be joined.
  • Each of the inlet pipe 53 and the boss 55 has a circular cross section, so that the thermal stress at these joints is dispersed and the stress concentration is relaxed.
  • the bypass pipe 6 is a pipe having a semicircular cross section (FIG. 3).
  • the bypass pipe 6 is disposed inside the lower case 12, and the upstream end of the bypass pipe 6 is joined to the lower case 12 by welding.
  • the downstream end of the bypass pipe 6 is not joined to any member and is a free end (FIG. 2).
  • a rib 12r extending in the circumferential direction is formed inside the lower case 12 (FIG. 2), and the bypass pipe 6 and the lower case 12 are in contact with each other via the rib 12r. Thereby, an air layer as a heat insulating layer is formed between the bypass pipe 6 and the lower case 12.
  • bypass pipe 6 is arranged away from the heat exchanger 5, and an air layer as a heat insulating layer is formed between them.
  • FIG. 5 is a partially enlarged view in which the portion B in FIG. 2 is enlarged.
  • Glass wool 71 is packed on the most downstream side of the gap between the heat exchanger 5 and the bypass pipe 6.
  • a SUS (stainless steel) mesh 72 is packed on the most downstream side of the gap between the bypass pipe 6 and the lower case 12.
  • a bead portion (not shown) is provided on the outer periphery of the bypass pipe 6 so that the positions of the glass wool 71 and the SUS mesh 72 do not shift.
  • the downstream end of the bypass pipe 6 is gently held only in the radial direction by the glass wool 71 and the SUS mesh 72, thereby suppressing the inflow of exhaust gas into the gap while allowing free thermal expansion of the bypass pipe 6. is doing.
  • the glass wool 71 instead of the SUS mesh 72 is packed in the gap between the heat exchanger 5 and the bypass pipe 6 is to suppress heat transfer from the bypass pipe 6 to the heat exchanger 5.
  • the gap between the bypass pipe 6 and the lower case 12 is filled with the SUS mesh 72, but the gap between the bypass pipe 6 and the lower case 12 may be filled with glass wool 71.
  • a plurality of fins 8 extending from the upstream side to the downstream side are radially attached to the outer periphery of the lower case 12 at substantially equal intervals in the circumferential direction (FIGS. 1 and 3). Since the exhaust heat recovery device 100 is attached under the floor of the vehicle in the direction shown in the drawing, the lower case 12 and the plurality of fins 8 are exposed to the traveling wind, and the heat of the lower case 12 is radiated during traveling.
  • the heat exchanger 5 and the upper case 11 are joined by joining only the inlet pipe 53 and the outlet pipe 54 to the upper case 11. As a result, the number of joints where thermal stress is generated is reduced, and a reduction in the life of the exhaust heat recovery device 100 can be suppressed.
  • thermal stress is generated at the joint between the upper case 11 and the inlet pipe 53 and the outlet pipe 54.
  • the thermal stress is dispersed by making the cross-sectional shapes of the inlet pipe 53 and the outlet pipe 54 circular. It is possible to suppress the strength reduction at the joint.
  • the upper case 11 and the inlet pipe 53 and the outlet pipe 54 are not directly joined, but the boss 55 is interposed between them, so that the rigidity at the joint is increased, and the upper case 11, the inlet pipe 53 and the Deformation of the outlet pipe 54 is suppressed, and a decrease in strength of the joint portion can be further suppressed.
  • an air layer as a heat insulating layer is formed between the heat exchanger 5 and the upper case 11 and the bypass pipe 6.
  • the bypass pipe 6 is joined to the lower case 12 only at the upstream end, and the downstream end is a free end. Thereby, the bypass pipe 6 can freely expand and contract, and the generation of thermal stress at the joint can be suppressed.
  • the upstream end of the bypass pipe 6 is joined to the lower case 12, but the downstream end may be joined to the lower case 12 and the upstream end may be a free end. Alternatively, both the upstream end and the downstream end may be free ends.
  • a rib 12r is provided on the inner surface of the lower case 12, so that the bypass pipe 6 and the lower case 12 are in contact with each other through the rib 12r.
  • the heat transferred from the bypass pipe 6 to the lower case 12 is reduced, and the heat transferred from the lower case 12 to the upper case 11 is also reduced. Therefore, according to this structure, generation
  • the heat dissipation of the lower case 12 can be enhanced. If the heat dissipation of the lower case 12 increases, the temperature of the lower case 12 decreases, so that the heat transmitted from the lower case 12 to the upper case 11 decreases, and the upper case 11 and the inlet pipe 53 and outlet pipe 54 are joined. The generation of thermal stress in the part can be further suppressed.
  • the fin 8 is a flat plate, but a plurality of cut-and-raised portions 81 may be formed on the surface of the fin 8 as shown in FIG. 6 to further enhance the heat dissipation of the lower case 12.
  • the exhaust heat recovery device 100 is mounted on the vehicle so that the heat exchanger 5 is positioned above the bypass pipe 6. According to this arrangement, since the upper case 11 is not exposed to the traveling wind, it is possible to suppress heat radiation from the heat exchanger 5, and pebbles and the like that are leap up from the road surface hit the heat exchanger 5 to damage the heat exchanger. Can be prevented. Further, the lower case 12 is exposed to traveling wind, and the heat dissipation of the lower case 12 can be further improved.
  • the condensed water that has moved to the bypass pipe 6 is outside the vehicle together with the exhaust gas at least immediately after starting the engine or immediately before stopping the engine regardless of the operating state of the exhaust heat recovery device 100. Is released.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

A waste heat recovery device is configured in such a manner that a heat exchanger which recovers the heat of exhaust gas from an engine and a bypass pipe which bypasses the heat exchanger are arranged in parallel within a case (a case body comprising an upper case and a lower case), and the exhaust gas of the engine is selectively caused to flow to either the heat exchanger or the bypass pipe, the selection being made by a flapper disposed within the case. The heat exchanger is provided with an inlet pipe which supplies to the heat exchanger a medium for exchanging heat with the exhaust gas, and also with an outlet pipe which discharges the medium within the heat exchanger. The heat exchanger is joined to the case by joining only the inlet pipe and the outlet pipe to the case.

Description

排熱回収器Waste heat recovery unit
　本発明は、エンジンの排気から熱を回収する排熱回収器に関する。 The present invention relates to an exhaust heat recovery device that recovers heat from engine exhaust.
　排熱回収器（熱交換器）によってエンジンの排気から熱を回収し、回収した熱を利用してエンジンの暖機を行ったり、熱を動力に変換してエンジンの出力補助や発電機の駆動に利用したりすることで、エンジンの効率を向上させる技術が知られている。 Heat is recovered from the exhaust of the engine using an exhaust heat recovery unit (heat exchanger), and the recovered heat is used to warm up the engine, or the heat is converted into power to assist engine output and drive the generator. For example, a technique for improving the efficiency of the engine is known.
　排熱回収器は、ＪＰ２００７－５３６４６６Ａに開示されるように、排気と水との間で熱交換を行う熱交換器と、熱の回収が不要の場合又は好ましくない場合に当該熱交換器をバイパスさせるバイパス管とを並列に設け、これらの上流側に排気を熱交換器及びバイパス管のいずれに流すかを選択するフラッパーを設けることによって構成される。 As disclosed in JP2007-536466A, an exhaust heat recovery unit bypasses the heat exchanger that performs heat exchange between exhaust gas and water, and the heat exchanger when heat recovery is unnecessary or undesirable. The bypass pipe is provided in parallel, and a flapper is provided on the upstream side of these so as to select which of the heat exchanger and the bypass pipe the exhaust gas flows.
　ＪＰ２００７－５３６４６６Ａに開示される排熱回収器においては、熱交換器とバイパス管とが、両端において接合されて、一体化されている。 In the exhaust heat recovery device disclosed in JP2007-536466A, a heat exchanger and a bypass pipe are joined and integrated at both ends.
　しかしながら、水によって冷却される熱交換器と６００℃前後の高温の排気に晒されるバイパス管とでは、熱膨張の程度が大きく異なり、これらが両端において接合されていると、接合部において大きな熱応力が発生する。熱応力の大きさは、排熱回収器の運転状態に応じて変動するので、応力集中部において疲労が進み、排熱回収器の寿命を短くする原因となる。 However, the degree of thermal expansion differs greatly between the heat exchanger cooled by water and the bypass pipe exposed to high-temperature exhaust at around 600 ° C. When these are joined at both ends, a large thermal stress is produced at the joint. Will occur. Since the magnitude of the thermal stress varies depending on the operating state of the exhaust heat recovery device, fatigue progresses in the stress concentration portion, which shortens the life of the exhaust heat recovery device.
　本発明は、このような技術的課題に鑑みてなされたもので、排熱回収器内部の熱応力を減らし、排熱回収器の寿命を長くすることを目的とする。 The present invention has been made in view of such technical problems, and an object thereof is to reduce the thermal stress inside the exhaust heat recovery device and extend the life of the exhaust heat recovery device.
　本発明のある態様によれば、ケース内にエンジンの排気の熱を回収する熱交換器と前記熱交換器をバイパスするバイパス管とを並列に設け、前記ケース内に配置されるフラッパーによって前記エンジンの排気を前記熱交換器及び前記バイパス管のいずれかに選択的に流す排熱回収器であって、前記熱交換器は、前記熱交換器に排気との熱交換用の媒体を供給する入口パイプと、前記熱交換器内の媒体を排出する出口パイプとを備え、前記熱交換器は、前記入口パイプ及び前記出口パイプのみを前記ケースと接合することによって、前記ケースと接合される、排熱回収器が提供される。 According to an aspect of the present invention, a heat exchanger that recovers heat of engine exhaust and a bypass pipe that bypasses the heat exchanger are provided in parallel in the case, and the engine is provided by a flapper that is disposed in the case. An exhaust heat recovery unit for selectively flowing the exhaust gas to either the heat exchanger or the bypass pipe, wherein the heat exchanger is an inlet for supplying a medium for heat exchange with the exhaust gas to the heat exchanger. A pipe and an outlet pipe for discharging the medium in the heat exchanger, wherein the heat exchanger is joined to the case by joining only the inlet pipe and the outlet pipe to the case. A heat recovery unit is provided.
　上記態様によれば、熱応力が発生する接合部の数が少なくなり、排熱回収器の寿命の低下を抑えることができる。 According to the above aspect, the number of joints where thermal stress is generated is reduced, and a reduction in the life of the exhaust heat recovery device can be suppressed.
図１は、排熱回収器の全体構成図である。FIG. 1 is an overall configuration diagram of the exhaust heat recovery device. 図２は、排熱回収器の縦断面図である。FIG. 2 is a longitudinal sectional view of the exhaust heat recovery device. 図３は、排熱回収器を図２のIII-III線で切断した横断面図である。FIG. 3 is a cross-sectional view of the exhaust heat recovery device taken along line III-III in FIG. 図４は、図２のＡ部を拡大した部分拡大図である。FIG. 4 is a partially enlarged view in which the portion A of FIG. 2 is enlarged. 図５は、図２のＢ部を拡大した部分拡大図である。FIG. 5 is a partially enlarged view in which the portion B in FIG. 2 is enlarged. 図６は、一部変形例を示した図である。FIG. 6 is a diagram showing a partial modification.
　以下、添付図面を参照しながら本発明の実施形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
　図１は、本発明の実施形態に係る排熱回収器の全体構成図、図２は、排熱回収器の縦断面図、図３は、排熱回収器を図２のIII-III線で切断した横断面図である。 1 is an overall configuration diagram of an exhaust heat recovery device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the exhaust heat recovery device, and FIG. 3 is an exhaust heat recovery device taken along line III-III in FIG. It is the cross-sectional view cut | disconnected.
　排熱回収器１００は、ケース本体１と、ケース本体１の上流側開口に接続される上流側アダプタ２と、ケース本体１の下流側開口に接続される下流側アダプタ３と、上流側アダプタ２内に配置されるフラッパー４と、ケース本体１内に配置される熱交換器５及びバイパス管６と、を備え、ケース本体１の下側が外気に露出するよう、図示の向き（熱交換器５が上側、バイパス管６が下側となる向き）で、車両の床下に取り付けられる。 The exhaust heat recovery device 100 includes a case body 1, an upstream adapter 2 connected to the upstream opening of the case body 1, a downstream adapter 3 connected to the downstream opening of the case body 1, and an upstream adapter 2. A flapper 4 disposed inside, a heat exchanger 5 and a bypass pipe 6 disposed in the case body 1, and the orientation shown in the drawing (the heat exchanger 5 so that the lower side of the case body 1 is exposed to the outside air. In the direction in which the bypass pipe 6 is on the lower side and the bypass pipe 6 on the lower side).
　ケース本体１は、上流側、下流側及び下側が開いた箱形の上側ケース１１と、上流側、下流側及び上側が開いた断面が半円形状の下側ケース１２とを組み合わせて構成される（図３）。 The case body 1 is configured by combining a box-shaped upper case 11 opened on the upstream side, downstream side and lower side, and a lower case 12 having a semicircular cross section opened on the upstream side, downstream side and upper side. (Figure 3).
　上流側アダプタ２は、上流側がフランジ２１になっており、フランジ２１を介してエンジンの排気管に接続される。 The upstream adapter 2 has a flange 21 on the upstream side, and is connected to the exhaust pipe of the engine via the flange 21.
　フラッパー４は、上流側アダプタ２の中央に設けられる。フラッパー４の回転軸４１は、排気の流れに対して直交する方向に延び、上流側アダプタ２を貫通している。回転軸４１を図示しないアクチュエータで駆動することによって、フラッパー４の位置を、排気を熱交換器５に流す位置（バイパス管６の入口を閉塞する位置、以下、「回収位置」とい。）と、排気をバイパス管６に流す位置（熱交換器５の入口を閉塞する位置、以下、「バイパス位置」という。）とで切り換えることができる。 The flapper 4 is provided in the center of the upstream adapter 2. The rotation shaft 41 of the flapper 4 extends in a direction orthogonal to the flow of exhaust gas, and penetrates the upstream adapter 2. By driving the rotary shaft 41 with an actuator (not shown), the position of the flapper 4 is changed to a position where the exhaust gas flows into the heat exchanger 5 (a position where the inlet of the bypass pipe 6 is closed, hereinafter referred to as “recovery position”). The position can be switched between a position where the exhaust gas flows into the bypass pipe 6 (a position where the inlet of the heat exchanger 5 is closed, hereinafter referred to as a “bypass position”).
　フラッパー４の初期位置（エンジンを始動させる時及びエンジンを停止させる時の位置）はバイパス位置である。 The initial position of flapper 4 (the position when starting and stopping the engine) is the bypass position.
　下流側アダプタ３は、下流側がフランジ３１になっており、フランジ３１を介してエンジンの排気管に接続される。 The downstream adapter 3 has a flange 31 on the downstream side, and is connected to the exhaust pipe of the engine via the flange 31.
　熱交換器５は、エンジンの排気を流通させる排気通路５１と、エンジンの冷却水を流通させる冷却水通路５２を内部に有する（図３）。冷却水通路５２には、熱交換器５の上面から上方に延びる入口パイプ５３と、熱交換器５の側面から側方に延びる出口パイプ５４が接続している。熱交換器５は、フラッパー４が回収位置にある場合は、排気と冷却水との間で熱交換を行わせる。 The heat exchanger 5 has an exhaust passage 51 through which engine exhaust flows and a cooling water passage 52 through which engine cooling water flows (FIG. 3). An inlet pipe 53 extending upward from the upper surface of the heat exchanger 5 and an outlet pipe 54 extending laterally from the side surface of the heat exchanger 5 are connected to the cooling water passage 52. When the flapper 4 is in the recovery position, the heat exchanger 5 exchanges heat between the exhaust gas and the cooling water.
　熱交換器５は上側ケース１１の内部に配置される。熱交換器５と上側ケース１１とは、入口パイプ５３及び出口パイプ５４をボス５５を介して上側ケース１１に接合することによって接合される。熱交換器５と上側ケース１１との接合位置はこの二箇所のみである。また、二箇所の接合位置を除き、熱交換器５と上側ケース１１との間には、断熱層としての空気層が形成される。 The heat exchanger 5 is disposed inside the upper case 11. The heat exchanger 5 and the upper case 11 are joined by joining the inlet pipe 53 and the outlet pipe 54 to the upper case 11 via the boss 55. There are only two joint positions between the heat exchanger 5 and the upper case 11. Moreover, an air layer as a heat insulating layer is formed between the heat exchanger 5 and the upper case 11 except for two joining positions.
　図４は、図２のＡ部を拡大した部分拡大図である。図中ハッチング部位は溶接部位を示している。 FIG. 4 is a partially enlarged view in which the portion A in FIG. 2 is enlarged. In the figure, hatched parts indicate welded parts.
　入口パイプ５３の端部にはボス５５が溶接によって接合されており、ボス５５は上側ケース１１と熱交換器５の上面とに溶接によって接合されており、これによって、入口パイプ５３が上側ケース１１に接合される。入口パイプ５３及びボス５５はいずれも横断面が円形であり、これら接合部における熱応力が分散され、応力集中が緩和されるようにしている。 A boss 55 is joined to the end of the inlet pipe 53 by welding, and the boss 55 is joined to the upper case 11 and the upper surface of the heat exchanger 5 by welding, whereby the inlet pipe 53 is joined to the upper case 11. To be joined. Each of the inlet pipe 53 and the boss 55 has a circular cross section, so that the thermal stress at these joints is dispersed and the stress concentration is relaxed.
　図４は、入口パイプ５３の接合部の構造を示しているが、出口パイプ５４の接合部の構造もこれと同様である。 4 shows the structure of the joint portion of the inlet pipe 53, the structure of the joint portion of the outlet pipe 54 is the same as this.
　バイパス管６は、断面が半円形状の管である（図３）。バイパス管６は下側ケース１２の内部に配置され、バイパス管６の上流側端部が下側ケース１２と溶接によって接合される。バイパス管６の下流側端部はいずれの部材とも接合されておらず、自由端となっている（図２）。 The bypass pipe 6 is a pipe having a semicircular cross section (FIG. 3). The bypass pipe 6 is disposed inside the lower case 12, and the upstream end of the bypass pipe 6 is joined to the lower case 12 by welding. The downstream end of the bypass pipe 6 is not joined to any member and is a free end (FIG. 2).
　また、下側ケース１２の内側には周方向に延びるリブ１２ｒが形成されており（図２）、バイパス管６と下側ケース１２とはリブ１２ｒを介して接触する。これによって、バイパス管６と下側ケース１２との間には、断熱層としての空気層が形成される。 Further, a rib 12r extending in the circumferential direction is formed inside the lower case 12 (FIG. 2), and the bypass pipe 6 and the lower case 12 are in contact with each other via the rib 12r. Thereby, an air layer as a heat insulating layer is formed between the bypass pipe 6 and the lower case 12.
　また、バイパス管６は熱交換器５から離して配置され、両者の間には断熱層としての空気層が形成される。 Further, the bypass pipe 6 is arranged away from the heat exchanger 5, and an air layer as a heat insulating layer is formed between them.
　図５は、図２のＢ部を拡大した部分拡大図である。 FIG. 5 is a partially enlarged view in which the portion B in FIG. 2 is enlarged.
　熱交換器５とバイパス管６との隙間の最下流側にはグラスウール７１が詰められている。またバイパス管６と下側ケース１２との隙間の最下流側にはＳＵＳ（ステンレス）メッシュ７２が詰められている。グラスウール７１及びＳＵＳメッシュ７２の位置がずれないように、バイパス管６の外周には図示しないビード部が設けられている。バイパス管６の下流側端部は、グラスウール７１及びＳＵＳメッシュ７２によって径方向にのみ緩やかに保持され、これによって、バイパス管６の自由な熱膨張を許容しつつ、隙間への排気の流入を抑制している。 Glass wool 71 is packed on the most downstream side of the gap between the heat exchanger 5 and the bypass pipe 6. A SUS (stainless steel) mesh 72 is packed on the most downstream side of the gap between the bypass pipe 6 and the lower case 12. A bead portion (not shown) is provided on the outer periphery of the bypass pipe 6 so that the positions of the glass wool 71 and the SUS mesh 72 do not shift. The downstream end of the bypass pipe 6 is gently held only in the radial direction by the glass wool 71 and the SUS mesh 72, thereby suppressing the inflow of exhaust gas into the gap while allowing free thermal expansion of the bypass pipe 6. is doing.
　熱交換器５とバイパス管６との隙間にＳＵＳメッシュ７２ではなくグラスウール７１を詰めているのは、バイパス管６から熱交換器５への伝熱を抑えるためである。ここではバイパス管６と下側ケース１２との隙間にＳＵＳメッシュ７２を詰めているが、バイパス管６と下側ケース１２との隙間にもグラスウール７１を詰めるようにしてもよい。 The reason why the glass wool 71 instead of the SUS mesh 72 is packed in the gap between the heat exchanger 5 and the bypass pipe 6 is to suppress heat transfer from the bypass pipe 6 to the heat exchanger 5. Here, the gap between the bypass pipe 6 and the lower case 12 is filled with the SUS mesh 72, but the gap between the bypass pipe 6 and the lower case 12 may be filled with glass wool 71.
　下側ケース１２の外周には、上流側から下流側にかけて延びる複数のフィン８が周方向に略等間隔に放射状に取り付けられている（図１、図３）。排熱回収器１００は図示の向きで車両の床下に取り付けられるので、下側ケース１２及び複数のフィン８は走行風に晒され、走行中は下側ケース１２の熱が放熱される。 A plurality of fins 8 extending from the upstream side to the downstream side are radially attached to the outer periphery of the lower case 12 at substantially equal intervals in the circumferential direction (FIGS. 1 and 3). Since the exhaust heat recovery device 100 is attached under the floor of the vehicle in the direction shown in the drawing, the lower case 12 and the plurality of fins 8 are exposed to the traveling wind, and the heat of the lower case 12 is radiated during traveling.
　続いて、排熱回収器１００を上記の通り構成することによる作用効果について説明する。 Then, the effect by having comprised the exhaust heat recovery device 100 as mentioned above is demonstrated.
　まず、上記実施形態は、入口パイプ５３及び出口パイプ５４のみを上側ケース１１と接合することによって熱交換器５と上側ケース１１とを接合するようにした。これによって、熱応力が発生する接合部の数が少なくなり、排熱回収器１００の寿命の低下を抑えることができる。 First, in the above embodiment, the heat exchanger 5 and the upper case 11 are joined by joining only the inlet pipe 53 and the outlet pipe 54 to the upper case 11. As a result, the number of joints where thermal stress is generated is reduced, and a reduction in the life of the exhaust heat recovery device 100 can be suppressed.
　この構成では、上側ケース１１と入口パイプ５３及び出口パイプ５４との接合部に熱応力が発生するが、入口パイプ５３及び出口パイプ５４の断面形状を円形としたことによって、熱応力を分散させることができ、接合部における強度低下を抑えることができる。 In this configuration, thermal stress is generated at the joint between the upper case 11 and the inlet pipe 53 and the outlet pipe 54. However, the thermal stress is dispersed by making the cross-sectional shapes of the inlet pipe 53 and the outlet pipe 54 circular. It is possible to suppress the strength reduction at the joint.
　また、上側ケース１１と入口パイプ５３及び出口パイプ５４とを直接接合するのではなく、これらの間にボス５５を介装したことによって、接合部における剛性が上がり、上側ケース１１、入口パイプ５３及び出口パイプ５４の変形が抑えられて、接合部の強度低下をさらに抑えることができる。 Further, the upper case 11 and the inlet pipe 53 and the outlet pipe 54 are not directly joined, but the boss 55 is interposed between them, so that the rigidity at the joint is increased, and the upper case 11, the inlet pipe 53 and the Deformation of the outlet pipe 54 is suppressed, and a decrease in strength of the joint portion can be further suppressed.
　また、熱交換器５と上側ケース１１及びバイパス管６との間には断熱層としての空気層が形成される。これによって、バイパス管６を流れる排気の熱が、熱交換器５に直接、又は、上側ケース１１を介して伝わるのが抑えられ、フラッパー４がバイパス位置にあるにもかかわらず排気の熱がエンジンの冷却水に伝えられてしまい、エンジンがオーバーヒートするのを抑えることができる。 Further, an air layer as a heat insulating layer is formed between the heat exchanger 5 and the upper case 11 and the bypass pipe 6. As a result, the heat of the exhaust flowing through the bypass pipe 6 is prevented from being transmitted directly to the heat exchanger 5 or via the upper case 11, and the heat of the exhaust is reduced even though the flapper 4 is in the bypass position. It is transmitted to the cooling water of the engine, and it is possible to suppress the engine from overheating.
　また、バイパス管６は、上流側端部においてのみ下側ケース１２と接合され、下流側端部を自由端とした。これによって、バイパス管６は自由に伸縮することができ、接合部における熱応力の発生を抑えることができる。上記実施形態では、バイパス管６の上流側端部を下側ケース１２と接合しているが、下流側端部を下側ケース１２と接合し、上流側端部を自由端としてもよい。又は、上流側端部及び下流側端部の両方を自由端としてもよい。 The bypass pipe 6 is joined to the lower case 12 only at the upstream end, and the downstream end is a free end. Thereby, the bypass pipe 6 can freely expand and contract, and the generation of thermal stress at the joint can be suppressed. In the above embodiment, the upstream end of the bypass pipe 6 is joined to the lower case 12, but the downstream end may be joined to the lower case 12 and the upstream end may be a free end. Alternatively, both the upstream end and the downstream end may be free ends.
　また、下側ケース１２の内面にリブ１２ｒを設け、バイパス管６と下側ケース１２とがリブ１２ｒを介して接触するようにした。これによって、バイパス管６から下側ケース１２に伝わる熱が少なくなり、下側ケース１２から上側ケース１１に伝わる熱も少なくなる。したがって、この構成によれば、上側ケース１１と入口パイプ５３及び出口パイプ５４との接合部における熱応力の発生をさらに抑えることができる。 Further, a rib 12r is provided on the inner surface of the lower case 12, so that the bypass pipe 6 and the lower case 12 are in contact with each other through the rib 12r. Thereby, the heat transferred from the bypass pipe 6 to the lower case 12 is reduced, and the heat transferred from the lower case 12 to the upper case 11 is also reduced. Therefore, according to this structure, generation | occurrence | production of the thermal stress in the junction part of the upper case 11, and the inlet pipe 53 and the outlet pipe 54 can further be suppressed.
　また、下側ケース１２の外周面を外気に露出させ、かつ、外周面にフィン８を設けたことによって、下側ケース１２の放熱性を高めることができる。下側ケース１２の放熱性が高まれば、下側ケース１２の温度が下がるので、下側ケース１２から上側ケース１１に伝わる熱が少なくなり、上側ケース１１と入口パイプ５３及び出口パイプ５４との接合部における熱応力の発生をさらに抑えることができる。 Further, by exposing the outer peripheral surface of the lower case 12 to the outside air and providing the fins 8 on the outer peripheral surface, the heat dissipation of the lower case 12 can be enhanced. If the heat dissipation of the lower case 12 increases, the temperature of the lower case 12 decreases, so that the heat transmitted from the lower case 12 to the upper case 11 decreases, and the upper case 11 and the inlet pipe 53 and outlet pipe 54 are joined. The generation of thermal stress in the part can be further suppressed.
　上記実施形態では、フィン８は平板であるが、図６に示すようにフィン８の表面に複数の切り起こし部８１を形成し、下側ケース１２の放熱性をさらに高めるようにしてもよい。 In the above embodiment, the fin 8 is a flat plate, but a plurality of cut-and-raised portions 81 may be formed on the surface of the fin 8 as shown in FIG. 6 to further enhance the heat dissipation of the lower case 12.
　また、排熱回収器１００は、熱交換器５がバイパス管６よりも上になる向きで車両に搭載される。この配置によれば、上側ケース１１が走行風に晒されないので、熱交換器５からの放熱を抑えることができ、路面から跳ね上げられた小石等が熱交換器５に当たって熱交換器が損傷するのを防止することができる。また、下側ケース１２が走行風に晒され、下側ケース１２の放熱性をさらに放熱性を高めることができる。 Further, the exhaust heat recovery device 100 is mounted on the vehicle so that the heat exchanger 5 is positioned above the bypass pipe 6. According to this arrangement, since the upper case 11 is not exposed to the traveling wind, it is possible to suppress heat radiation from the heat exchanger 5, and pebbles and the like that are leap up from the road surface hit the heat exchanger 5 to damage the heat exchanger. Can be prevented. Further, the lower case 12 is exposed to traveling wind, and the heat dissipation of the lower case 12 can be further improved.
　さらに、エンジン停止時に熱交換器５内で発生する凝縮水が重力によってバイパス管６へと移動するので、熱交換器５内に凝縮水が残留することによる熱交換器５の腐食や凍結を防止することができる。 Furthermore, since the condensed water generated in the heat exchanger 5 when the engine is stopped moves to the bypass pipe 6 due to gravity, corrosion and freezing of the heat exchanger 5 due to the remaining condensed water in the heat exchanger 5 are prevented. can do.
　バイパス管６に移動した凝縮水は、フラッパー４の初期位置がバイパス位置であるので、排熱回収器１００の作動状態に関係なく、少なくともエンジンを始動した直後又はエンジンを停止させる直前に排気とともに車外へと放出される。 Since the initial position of the flapper 4 is the bypass position, the condensed water that has moved to the bypass pipe 6 is outside the vehicle together with the exhaust gas at least immediately after starting the engine or immediately before stopping the engine regardless of the operating state of the exhaust heat recovery device 100. Is released.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例を示したものであり、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 The embodiment of the present invention has been described above, but the above embodiment shows an application example of the present invention, and is not intended to limit the technical scope of the present invention to the specific configuration of the above embodiment.
　本願は2011年7月4日に日本国特許庁に出願された特願2011-148144に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。 This application claims priority based on Japanese Patent Application No. 2011-148144 filed with the Japan Patent Office on July 4, 2011, the entire contents of which are incorporated herein by reference.

Claims (9)

  1. 　ケース内にエンジンの排気の熱を回収する熱交換器と前記熱交換器をバイパスするバイパス管とを並列に設け、前記ケース内に配置されるフラッパーによって前記エンジンの排気を前記熱交換器及び前記バイパス管のいずれかに選択的に流す排熱回収器であって、
    　前記熱交換器は、前記熱交換器に排気との熱交換用の媒体を供給する入口パイプと、前記熱交換器内の媒体を排出する出口パイプとを備え、
    　前記熱交換器は、前記入口パイプ及び前記出口パイプのみを前記ケースと接合することによって、前記ケースと接合される、
    排熱回収器。     A heat exchanger that recovers heat of the engine exhaust in the case and a bypass pipe that bypasses the heat exchanger are provided in parallel, and the engine exhaust is exhausted by the flapper disposed in the case. An exhaust heat recovery device that selectively flows into one of the bypass pipes,
    The heat exchanger includes an inlet pipe that supplies a medium for heat exchange with exhaust gas to the heat exchanger, and an outlet pipe that discharges the medium in the heat exchanger,
    The heat exchanger is joined to the case by joining only the inlet pipe and the outlet pipe to the case.
    Waste heat recovery unit.
  2. 　請求項１に記載の排熱回収器であって、
    　前記入口パイプ及び前記出口パイプの断面が円形である、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    The inlet pipe and the outlet pipe have a circular cross section,
    Waste heat recovery unit.
  3. 　請求項１に記載の排熱回収器であって、
    　前記ケースと前記入口パイプ及び前記出口パイプとの接合部にそれぞれボスが介装される、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    Boss is interposed at the joint between the case and the inlet pipe and the outlet pipe,
    Waste heat recovery unit.
  4. 　請求項１に記載の排熱回収器であって、
    　前記熱交換器と前記ケース及び前記バイパス管との間に断熱層が形成される、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    A heat insulating layer is formed between the heat exchanger and the case and the bypass pipe;
    Waste heat recovery unit.
  5. 　請求項１に記載の排熱回収器であって、
    　前記バイパス管と前記ケースとは、接合されていない、又は、接合箇所が一箇所である、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    The bypass pipe and the case are not joined, or the joining place is one place,
    Waste heat recovery unit.
  6. 　請求項１に記載の排熱回収器であって、
    　前記ケースは、内面にリブを有しており、
    　前記バイパス管と前記ケースとは、前記リブを介して接触する、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    The case has a rib on the inner surface,
    The bypass pipe and the case are in contact with each other via the rib;
    Waste heat recovery unit.
  7. 　請求項１に記載の排熱回収器であって、
    　前記ケースの前記バイパス管を収容する部分の外周面を外気に露出させ、かつ、前記外周面にフィンを設けた、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    Exposing the outer peripheral surface of the portion of the case containing the bypass pipe to the outside air, and providing fins on the outer peripheral surface;
    Waste heat recovery unit.
  8. 　請求項７に記載の排熱回収器であって、
    　前記フィンには切り起こし部が形成される、
    排熱回収器。     The exhaust heat recovery device according to claim 7,
    A cut and raised portion is formed in the fin,
    Waste heat recovery unit.
  9. 　請求項１に記載の排熱回収器であって、
    　前記排熱回収器は、前記熱交換器が前記バイパス管よりも上になるように車両に搭載される、
    排熱回収器。     The exhaust heat recovery device according to claim 1,
    The exhaust heat recovery device is mounted on a vehicle such that the heat exchanger is above the bypass pipe.
    Waste heat recovery unit.
PCT/JP2012/065101 2011-07-04 2012-06-13 Waste heat recovery device WO2013005541A1 (en)

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