WO2015111335A1 - Exhaust heat recovery device - Google Patents

Exhaust heat recovery device Download PDF

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Publication number
WO2015111335A1
WO2015111335A1 PCT/JP2014/083522 JP2014083522W WO2015111335A1 WO 2015111335 A1 WO2015111335 A1 WO 2015111335A1 JP 2014083522 W JP2014083522 W JP 2014083522W WO 2015111335 A1 WO2015111335 A1 WO 2015111335A1
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Prior art keywords
cooling water
flow path
flow rate
exhaust
heat exchanger
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PCT/JP2014/083522
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French (fr)
Japanese (ja)
Inventor
翔一 村田
裕久 大上
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フタバ産業株式会社
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Publication of WO2015111335A1 publication Critical patent/WO2015111335A1/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
    • 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
    • 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 discharged together with exhaust gas.
  • a technology for improving the fuel efficiency of passenger cars by recovering heat (exhaust heat) discharged together with exhaust gas from passenger car engines and reusing the heat is widely used.
  • Patent Document 1 describes a system for recovering exhaust heat by causing heat exchange between exhaust gas discharged from an engine of a passenger car and cooling water flowing through a cooling water flow path by an electric pump. ing.
  • This cooling water is used mainly for cooling the engine and the catalyst during traveling, and is cooled by exchanging heat with air in a radiator disposed in the cooling water flow path.
  • it plays the role of transferring exhaust heat from the exhaust gas to the engine and catalyst for warming up. .
  • the cooling water from which the exhaust heat has been recovered becomes extremely hot, and after the cooling water reaches a predetermined temperature, It is necessary to control to suppress or stop the heat exchange.
  • the heat exchange is controlled by adjusting the flow rate of the cooling water. Specifically, by controlling the electric pump, the flow rate of the cooling water flowing through the cooling water flow path is adjusted. The flow rate is increased until the cooling water reaches a predetermined temperature to promote heat exchange. After the water reaches a predetermined temperature, the flow rate is reduced to suppress heat exchange.
  • Patent Document 1 has a problem that the control and configuration of the electric pump becomes complicated and the manufacturing cost tends to increase in order to be able to adjust the flow rate of the cooling water flowing through the cooling water flow path. It was.
  • the present invention has been made in view of such problems, and its purpose is to appropriately control heat exchange between cooling water and exhaust gas while suppressing manufacturing costs by simplifying control and configuration.
  • An object of the present invention is to provide an exhaust heat recovery device capable of achieving the above.
  • an exhaust heat recovery device is an exhaust heat recovery device that recovers heat discharged together with exhaust gas, and an exhaust gas flow channel for flowing exhaust gas, and a cooling water flow channel for flowing cooling water
  • a heat exchanger disposed in the exhaust gas flow path, a distribution flow path for flowing cooling water in the cooling water flow path from a branch portion provided in the cooling water flow path to the heat exchanger, A return flow path for returning the cooling water heat-exchanged with the exhaust gas in the heat exchanger from the junction provided in the cooling water flow path downstream from the branching section into the cooling water flow path, and in the cooling water flow path
  • a distribution flow rate regulator that adjusts the flow rate of the cooling water that is distributed from the flow channel to the heat exchanger via the distribution channel, and the distribution flow rate regulator is configured to provide cooling water that flows in the cooling water channel.
  • the heat exchanger is compared to when the temperature is low It is characterized by being configured so as to reduce the flow rate of the cooling water to flow and.
  • the exhaust heat recovery device when the temperature of the cooling water increases, the heat exchange in the heat exchanger is suppressed by adjusting the flow rate of the cooling water distributed from the cooling water flow path. Is possible. Therefore, the heat exchange between the cooling water and the exhaust gas can be appropriately controlled without complicated control of the pump, and the control and configuration can be simplified. Is possible.
  • the distribution flow rate adjuster is disposed in the cooling water flow path.
  • the distribution flow rate regulator is arranged in the cooling water flow path, so that the overall structure is made compact and sensitive to the temperature change of the cooling water in the cooling water flow path with high accuracy. It becomes possible to appropriately adjust the flow rate of the cooling water distributed from the inside of the road.
  • the distribution flow rate adjuster is disposed in the cooling water flow path between the branch portion and the merging portion, and a temperature of the cooling water flowing in the cooling water flow path is set. In the case where the temperature is high, it is also preferable that the water flow cross-sectional area of the cooling water flow path is increased as compared with the case where the temperature is low.
  • the distribution flow rate regulator flows in the cooling water flow path without being distributed in order to increase the cross-sectional area of the cooling water flow path when the temperature of the cooling water flowing in the cooling water flow path is high. While the flow rate of the continued cooling water increases, the flow rate of the cooling water distributed from the cooling water flow path and flowing to the heat exchanger decreases. For this reason, when the temperature of the cooling water flowing in the cooling water flow path is high, the flow rate of the cooling water is adjusted so that the heat exchange in the heat exchanger is suppressed, and the heat exchange between the cooling water and the exhaust gas is appropriately controlled. It becomes possible to do.
  • an exhaust heat recovery device capable of appropriately controlling the heat exchange between the cooling water and the exhaust gas while suppressing the manufacturing cost with simple control and configuration.
  • FIG. 1 is a cross-sectional view illustrating a state during exhaust heat recovery of an exhaust heat recovery unit 100 according to an embodiment of the present invention.
  • the exhaust heat recovery device 100 includes an exhaust device 10, a cooling device 20, a heat exchanger 30, a branch pipe 40, a return pipe 50, and a distribution flow rate regulator 60. Yes.
  • the exhaust device 10 is a device that guides exhaust gas discharged from an engine (not shown) of a passenger car to the outside of the vehicle, and includes a muffler 11.
  • the muffler 11 is a tubular metal member that extends from an engine disposed in the front part of the passenger car to the rear part of the passenger car, and a part thereof is shown in FIG.
  • a catalyst (not shown) is disposed inside the muffler 11, and the exhaust gas discharged from the engine is subjected to a predetermined purification process by passing through the catalyst, and then from the rear part of the passenger car. It is discharged outside the car.
  • the cooling device 20 is a device that cools the engine by circulating cooling water through an engine and a radiator (not shown) during travel of the passenger car, and includes an inlet pipe 21, a large-diameter pipe 22, an outlet pipe 23, have.
  • the inlet pipe 21, the large diameter pipe 22, and the outlet pipe 23 are all tubular metal members. By arranging and connecting them in a straight line, a cooling water flow path 24 is formed therein, and the cooling water pumped by a pump (not shown) is shown in the inlet pipe 21 as indicated by an arrow C11. Inflow from.
  • the inlet pipe 21 and the outlet pipe 23 are formed so that their inner diameters are substantially equal, whereas the large diameter pipe 22 disposed between them has an inner diameter of 2 of the inlet pipe 21 and the outlet pipe 23. It is set to about twice.
  • the large-diameter pipe 22 has a branch portion 22a and a junction portion 22b that are openings on the side surfaces thereof.
  • the heat exchanger 30 is a device that exchanges heat between fluids, and is disposed in the exhaust gas flow path 12.
  • the heat exchanger 30 is formed of a thin-walled steel material, and performs heat exchange via the steel material between a fluid flowing through a flow path formed therein and a fluid flowing outside the heat exchanger 30. Make it.
  • An inlet portion 31 and an outlet portion 32 are formed on one side surface of the heat exchanger 30 on the cooling device 20 side. The fluid that has flowed into the heat exchanger 30 from the inlet portion 31 flows through the internal flow path to perform heat exchange, and then flows out of the heat exchanger 30 from the outlet portion 32.
  • the branch pipe 40 is a tubular metal member, and a distribution channel 41 is formed therein.
  • the branch pipe 40 is disposed so as to straddle between the exhaust device 10 and the cooling device 20, one end portion 40 a is connected to the inlet portion 31 of the heat exchanger 30, and the other end portion 40 b is a large diameter of the cooling device 20. It is connected to the branch part 22 a of the tube 22.
  • the distribution flow path 41 forms the flow path which flows the cooling water distributed from the inside of the cooling water flow path 24 to the heat exchanger 30, as represented by arrows C12 and C13.
  • the return pipe 50 is a tubular metal member, and a return flow path 51 is formed therein.
  • the return pipe 50 is disposed so as to straddle between the exhaust device 10 and the cooling device 20, one end portion 50 a thereof is connected to the outlet portion 32 of the heat exchanger 30, and the other end portion 50 b is a large diameter of the cooling device 20.
  • the tube 22 is connected to the junction 22b.
  • the return flow path 51 forms the flow path which returns the cooling water heat-exchanged in the heat exchanger 30 from the confluence
  • the distribution flow rate regulator 60 is disposed in the cooling water flow path 24 between the branch portion 22a and the merge portion 22b, and includes a rod support member 61, a rod 62, a valve body 63, a valve seat member 64, and a coil spring. 65.
  • the distribution flow rate regulator 60 is a valve device that changes the water flow cross-sectional area of the cooling water passage 24 by moving the valve body 63 according to the temperature of the cooling water flowing in the cooling water passage 24.
  • FIG. 1 shows a state in which the valve body 63 is urged by the coil spring 65 and pressed against the annular valve seat member 64.
  • the valve body 63 is provided with a recess 63a at an end thereof, and a rod 62 supported by a rod support member 61 fixed to the large-diameter pipe 22 is inserted into the recess 63a.
  • a wax 66 is filled between the tip of the inserted rod 62 and the concave portion 63a, and the wax 66 expands or contracts according to the temperature of the cooling water, so that the valve The body 63 is moved along the rod 62.
  • FIG. 2 is a cross-sectional view illustrating a state of the exhaust heat recovery device 100 according to the embodiment of the present invention during non-exhaust heat recovery.
  • the exhaust heat recovery device 100 takes the form shown in FIG. 1 to recover the exhaust heat from the exhaust gas and use it to warm up the engine.
  • the operation of the exhaust heat recovery device 100 during the exhaust heat recovery will be described.
  • the cooling water pumped by the pump begins to flow through the cooling water passage 24.
  • the temperature of the cooling water flowing through the cooling water flow path 24 is still low, the temperature of the wax 66 of the distribution flow rate regulator 60 is also low and its volume is small.
  • the valve body 63 of the distribution flow rate regulator 60 is urged by the coil spring 65 and pressed against the valve seat member 64 without receiving an expansion force from the wax 66.
  • the water flow cross-sectional area of the cooling water flow path 24 at the portion where the distribution flow rate regulator 60 is disposed becomes zero, and the cooling water is distributed flow rate. It cannot pass through the regulator 60.
  • the cooling water that has flowed into the inlet pipe 21 as indicated by the arrow C11 cannot pass through the distribution flow rate regulator 60, so that the total amount of the cooling water enters the distribution flow path 41 from the branch portion 22a as indicated by the arrow C12. Inflow.
  • the cooling water flows into the heat exchanger 30 from the inlet 31 through the distribution channel 41 as indicated by an arrow C13.
  • the cooling water exchanges heat with the high-temperature exhaust gas flowing outside the heat exchanger 30 by flowing through the flow path formed in the heat exchanger 30. That is, the exhaust heat is recovered by the cooling water.
  • the exhaust heat is recovered, and the cooling water that has reached a high temperature flows out of the heat exchanger 30 from the outlet portion 32.
  • the cooling water is returned into the cooling water channel 24 from the junction 22b on the downstream side of the distribution flow rate regulator 60 via the return channel 51.
  • the exhaust heat recovered from the exhaust gas in this way is used to warm up the cooling water as it flows from the outlet pipe 23 to the engine and catalyst as indicated by the arrow C16.
  • the wax 66 in the concave portion 63a of the valve body 63 of the distribution flow rate regulator 60 also becomes high temperature and starts to melt, and its volume expands.
  • the valve body 63 receives the expansion force in a direction away from the rod 62. For this reason, the valve body 63 receiving the expansion force from the wax 66 moves along the rod 62 so as to compress and retract the coil spring 65 that urges the valve body 63.
  • valve body 63 is separated from the valve seat member 64 that has been pressed so far, and a gap is formed between them. That is, the water flow cross-sectional area of the cooling water flow path 24 at the portion where the distribution flow rate regulator 60 is disposed increases. For this reason, the cooling water that has flowed into the inlet pipe 21 as indicated by the arrow C21 flows into the heat exchanger 30 from the branch portion 22a of the large-diameter pipe 22 as indicated by the arrow C22 and remains. Is distributed so as to pass through the distribution flow regulator 60 as indicated by an arrow C27.
  • the cooling water heat-exchanged with the exhaust gas in the heat exchanger 30 is transferred from the merging portion 22b into the cooling water flow path 24 via the return flow path 51 as indicated by arrows C24 and C25. Returned. Therefore, the flow rate of the cooling water (arrow C26 in FIG. 2) flowing out from the outlet pipe 23 during non-exhaust heat recovery is changed from the flow rate of the cooling water (arrow C16 in FIG. 1) flowing out from the outlet pipe 23 during exhaust heat recovery. It becomes possible to adjust the flow volume of the cooling water sent to the heat exchanger 30 without this. That is, it is possible to appropriately control the heat exchange between the cooling water and the exhaust gas without complicated control of the pump that pumps the cooling water.
  • the distribution flow rate regulator 60 in the cooling water flow path 24, the overall configuration is made compact, and the cooling water flow is sensitive to the temperature change of the cooling water in the cooling water flow path 24 with high accuracy. It becomes possible to appropriately adjust the flow rate of the cooling water distributed from the passage 24.
  • the distribution flow rate regulator 60 increases the flow cross-sectional area of the cooling water passage 24 when the temperature of the cooling water flowing through the cooling water passage 24 is high. While the flow rate of the cooling water that continues to flow increases, the flow rate of the cooling water that is distributed from the cooling water flow path 24 and flows to the heat exchanger 30 decreases. For this reason, when the temperature of the cooling water flowing through the cooling water channel 24 is high, the flow rate of the cooling water is adjusted so that heat exchange in the heat exchanger 30 is suppressed, and heat exchange between the cooling water and the exhaust gas is appropriately performed. It becomes possible to control to.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Chimneys And Flues (AREA)

Abstract

　A distribution flow rate regulator (60), which regulates the flow rate of coolant flowing from a branching part (22a) provided to a coolant channel (24) to a heat exchanger (30) via a distribution channel (41), reduces the flow rate of coolant flowing to the heat exchanger (30) so that the flow rate is lower when the temperature of the coolant flowing within the coolant channel (24) is high than when the temperature is low.

Description

排気熱回収器Exhaust heat recovery unit
　本発明は、排ガスとともに排出される熱を回収する排気熱回収器に関する。 The present invention relates to an exhaust heat recovery device that recovers heat discharged together with exhaust gas.
　乗用車のエンジンから排ガスとともに排出される熱（排気熱）を回収し、その熱を再利用することで、乗用車の燃費向上等を図る技術が広く普及している。 A technology for improving the fuel efficiency of passenger cars by recovering heat (exhaust heat) discharged together with exhaust gas from passenger car engines and reusing the heat is widely used.
　下記特許文献１には、乗用車のエンジンから排出される排ガスと、電動ポンプによって冷却水流路内を流される冷却水との間で熱交換を行わせることで、排気熱を回収するシステムが記載されている。この冷却水は、走行時のエンジンや触媒の冷却を主な目的として用いられるものであり、冷却水流路に配置されたラジエータにおいて空気と熱交換を行い、冷却される。一方、エンジンの始動時には、その暖機のために、排ガスからエンジンや触媒へと排気熱を移動させる役割を果たしており、このような暖機システムは、寒冷地仕様の乗用車等で採用されている。 The following Patent Document 1 describes a system for recovering exhaust heat by causing heat exchange between exhaust gas discharged from an engine of a passenger car and cooling water flowing through a cooling water flow path by an electric pump. ing. This cooling water is used mainly for cooling the engine and the catalyst during traveling, and is cooled by exchanging heat with air in a radiator disposed in the cooling water flow path. On the other hand, when starting the engine, it plays the role of transferring exhaust heat from the exhaust gas to the engine and catalyst for warming up. .
　この暖気システムのような排気熱を回収するシステムにおいては、排気熱を回収した冷却水が著しく高温となり、沸騰することを防止するために、冷却水が所定温度に達した後は、排ガスとの熱交換を抑制又は停止させるように制御する必要がある。下記特許文献１記載のシステムでは、この熱交換の制御を、冷却水の流量の調整によって行っている。詳細には、電動ポンプを制御することにより、冷却水流路を流れる冷却水の流量を調整するものであって、冷却水が所定温度に達するまでは流量を大きくして熱交換を促す一方、冷却水が所定温度に達した後は流量を小さくして熱交換を抑制している。 In a system for recovering exhaust heat such as this warm air system, the cooling water from which the exhaust heat has been recovered becomes extremely hot, and after the cooling water reaches a predetermined temperature, It is necessary to control to suppress or stop the heat exchange. In the system described in Patent Document 1, the heat exchange is controlled by adjusting the flow rate of the cooling water. Specifically, by controlling the electric pump, the flow rate of the cooling water flowing through the cooling water flow path is adjusted. The flow rate is increased until the cooling water reaches a predetermined temperature to promote heat exchange. After the water reaches a predetermined temperature, the flow rate is reduced to suppress heat exchange.
特開２００８－１９０４３７号公報JP 2008-190437 A
　しかしながら、上記特許文献１記載のシステムでは、冷却水流路を流れる冷却水の流量を調整可能とするために、電動ポンプの制御や構成が複雑になり、製造コストが増大し易いという課題を有していた。 However, the system described in Patent Document 1 has a problem that the control and configuration of the electric pump becomes complicated and the manufacturing cost tends to increase in order to be able to adjust the flow rate of the cooling water flowing through the cooling water flow path. It was.
　本発明はこのような課題に鑑みてなされたものであり、その目的は、制御や構成を簡易なものとして製造コストを抑制しながらも、冷却水と排ガスとの熱交換を適切に制御することが可能な排気熱回収器を提供することにある。 The present invention has been made in view of such problems, and its purpose is to appropriately control heat exchange between cooling water and exhaust gas while suppressing manufacturing costs by simplifying control and configuration. An object of the present invention is to provide an exhaust heat recovery device capable of achieving the above.
　上記課題を解決するために、本発明に係る排気熱回収器は、排ガスとともに排出される熱を回収する排気熱回収器であって、排ガスを流す排ガス流路と、冷却水を流す冷却水流路と、前記排ガス流路内に配置された熱交換器と、前記冷却水流路内の冷却水を、前記冷却水流路に設けられた分岐部から前記熱交換器へと流す分配流路と、前記熱交換器において排ガスと熱交換した冷却水を、前記分岐部よりも下流側の前記冷却水流路に設けられた合流部から前記冷却水流路内へと戻す帰還流路と、前記冷却水流路内から分配し前記分配流路を介して前記熱交換器へと流す冷却水の流量を調整する分配流量調整器と、を備え、前記分配流量調整器は、前記冷却水流路内を流れる冷却水の温度が高い場合は、温度が低い場合に比べて前記熱交換器へと流す冷却水の流量を小さくするように構成されていることを特徴としている。 In order to solve the above-described problems, an exhaust heat recovery device according to the present invention is an exhaust heat recovery device that recovers heat discharged together with exhaust gas, and an exhaust gas flow channel for flowing exhaust gas, and a cooling water flow channel for flowing cooling water A heat exchanger disposed in the exhaust gas flow path, a distribution flow path for flowing cooling water in the cooling water flow path from a branch portion provided in the cooling water flow path to the heat exchanger, A return flow path for returning the cooling water heat-exchanged with the exhaust gas in the heat exchanger from the junction provided in the cooling water flow path downstream from the branching section into the cooling water flow path, and in the cooling water flow path And a distribution flow rate regulator that adjusts the flow rate of the cooling water that is distributed from the flow channel to the heat exchanger via the distribution channel, and the distribution flow rate regulator is configured to provide cooling water that flows in the cooling water channel. When the temperature is high, the heat exchanger is compared to when the temperature is low It is characterized by being configured so as to reduce the flow rate of the cooling water to flow and.
　本発明に係る排気熱回収器によれば、冷却水の温度が高まった場合に、冷却水流路内から分配される冷却水の流量を調整することで、熱交換器における熱交換を抑制することが可能となる。したがって、ポンプの複雑な制御によることなく、冷却水と排ガスとの熱交換を適切に制御することができ、その制御や構成も簡易なものとすることができるため、製造コストの抑制を図ることが可能となる。 According to the exhaust heat recovery device according to the present invention, when the temperature of the cooling water increases, the heat exchange in the heat exchanger is suppressed by adjusting the flow rate of the cooling water distributed from the cooling water flow path. Is possible. Therefore, the heat exchange between the cooling water and the exhaust gas can be appropriately controlled without complicated control of the pump, and the control and configuration can be simplified. Is possible.
　また本発明に係る排気熱回収器では、前記分配流量調整器は、前記冷却水流路内に配置されていることも好ましい。 In the exhaust heat recovery device according to the present invention, it is also preferable that the distribution flow rate adjuster is disposed in the cooling water flow path.
　この好ましい態様では、分配流量調整器を冷却水流路内に配置することで、全体の構成をコンパクトなものにするとともに、冷却水流路内の冷却水の温度変化に高い精度で感応し、冷却水流路内から分配される冷却水の流量を適切に調整することが可能となる。 In this preferred embodiment, the distribution flow rate regulator is arranged in the cooling water flow path, so that the overall structure is made compact and sensitive to the temperature change of the cooling water in the cooling water flow path with high accuracy. It becomes possible to appropriately adjust the flow rate of the cooling water distributed from the inside of the road.
　また本発明に係る排気熱回収器では、前記分配流量調整器は、前記分岐部と前記合流部との間の前記冷却水流路内に配置され、前記冷却水流路内を流れる冷却水の温度が高い場合は、温度が低い場合に比べて前記冷却水流路の通水断面積を大きくするように構成されていることも好ましい。 In the exhaust heat recovery device according to the present invention, the distribution flow rate adjuster is disposed in the cooling water flow path between the branch portion and the merging portion, and a temperature of the cooling water flowing in the cooling water flow path is set. In the case where the temperature is high, it is also preferable that the water flow cross-sectional area of the cooling water flow path is increased as compared with the case where the temperature is low.
　この好ましい態様では、分配流量調整器は、冷却水流路内を流れる冷却水の温度が高い場合に、冷却水流路の通水断面積を大きくするため、分配されることなく冷却水流路内を流れ続ける冷却水の流量が大きくなる一方、冷却水流路内から分配されて熱交換器へと流される冷却水の流量が小さくなる。このため、冷却水流路内を流れる冷却水の温度が高い場合に、熱交換器における熱交換が抑制されるように冷却水の流量を調整し、冷却水と排ガスとの熱交換を適切に制御することが可能となる。 In this preferred embodiment, the distribution flow rate regulator flows in the cooling water flow path without being distributed in order to increase the cross-sectional area of the cooling water flow path when the temperature of the cooling water flowing in the cooling water flow path is high. While the flow rate of the continued cooling water increases, the flow rate of the cooling water distributed from the cooling water flow path and flowing to the heat exchanger decreases. For this reason, when the temperature of the cooling water flowing in the cooling water flow path is high, the flow rate of the cooling water is adjusted so that the heat exchange in the heat exchanger is suppressed, and the heat exchange between the cooling water and the exhaust gas is appropriately controlled. It becomes possible to do.
　本発明によれば、制御や構成を簡易なものとして製造コストを抑制しながらも、冷却水と排ガスとの熱交換を適切に制御することが可能な排気熱回収器を提供することができる。 According to the present invention, it is possible to provide an exhaust heat recovery device capable of appropriately controlling the heat exchange between the cooling water and the exhaust gas while suppressing the manufacturing cost with simple control and configuration.
本発明の実施形態に係る排気熱回収器の排気熱回収時の状態を表す断面図である。It is sectional drawing showing the state at the time of exhaust heat recovery of the exhaust heat recovery device which concerns on embodiment of this invention. 本発明の実施形態に係る排気熱回収器の非排気熱回収時の状態を表す断面図である。It is sectional drawing showing the state at the time of the non-exhaust heat recovery of the exhaust heat recovery device which concerns on embodiment of this invention.
　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。理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の符号を付し、重複する説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate understanding, the same components are denoted by the same reference numerals as much as possible in the drawings, and redundant description is omitted.
　まず、図１を参照して、本発明の実施形態に係る排気熱回収器の概要を説明する。図１は、本発明の実施形態に係る排気熱回収器１００の排気熱回収時の状態を表す断面図である。 First, an outline of an exhaust heat recovery device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view illustrating a state during exhaust heat recovery of an exhaust heat recovery unit 100 according to an embodiment of the present invention.
　図１に示すように、排気熱回収器１００は、排気装置１０と、冷却装置２０と、熱交換器３０と、分岐管４０と、帰還管５０と、分配流量調整器６０と、を備えている。 As shown in FIG. 1, the exhaust heat recovery device 100 includes an exhaust device 10, a cooling device 20, a heat exchanger 30, a branch pipe 40, a return pipe 50, and a distribution flow rate regulator 60. Yes.
　排気装置１０は、乗用車のエンジン（図示せず）から排出される排ガスを、車外へと導く装置であり、マフラー１１を有している。マフラー１１は、乗用車の前方部に配置されるエンジンから、乗用車の後方部にかけて延びる管状の金属製部材であり、図１にはその一部分が表されている。マフラー１１の内部には、矢印Ｅ１１及びＥ１２で表す方向に排ガスを流す排ガス流路１２が形成されている。また、マフラー１１の内部には触媒（図示せず）が配置されており、エンジンから排出された排ガスは、当該触媒を通過することで所定の浄化処理が行われ、その後に乗用車の後方部から車外へと排出される。 The exhaust device 10 is a device that guides exhaust gas discharged from an engine (not shown) of a passenger car to the outside of the vehicle, and includes a muffler 11. The muffler 11 is a tubular metal member that extends from an engine disposed in the front part of the passenger car to the rear part of the passenger car, and a part thereof is shown in FIG. Inside the muffler 11, there is formed an exhaust gas flow path 12 through which exhaust gas flows in the direction indicated by arrows E11 and E12. A catalyst (not shown) is disposed inside the muffler 11, and the exhaust gas discharged from the engine is subjected to a predetermined purification process by passing through the catalyst, and then from the rear part of the passenger car. It is discharged outside the car.
　冷却装置２０は、乗用車の走行時に、エンジン及びラジエータ（図示せず）に冷却水を循環させてエンジンの冷却を行う装置であり、入口管２１と、大径管２２と、出口管２３と、を有している。入口管２１、大径管２２及び出口管２３は、いずれも管状の金属製部材である。これらを直線状に配置して連結することで、その内部には冷却水流路２４が形成されており、ポンプ（図示せず）によって圧送された冷却水が、矢印Ｃ１１で表すように入口管２１から流入する。入口管２１及び出口管２３は、その内径がほぼ等しくなるように形成されているのに対し、それらの間に配置される大径管２２は、その内径が入口管２１及び出口管２３の２倍程度に設定されている。大径管２２は、その側面に開口である分岐部２２ａ及び合流部２２ｂが開設されている。 The cooling device 20 is a device that cools the engine by circulating cooling water through an engine and a radiator (not shown) during travel of the passenger car, and includes an inlet pipe 21, a large-diameter pipe 22, an outlet pipe 23, have. The inlet pipe 21, the large diameter pipe 22, and the outlet pipe 23 are all tubular metal members. By arranging and connecting them in a straight line, a cooling water flow path 24 is formed therein, and the cooling water pumped by a pump (not shown) is shown in the inlet pipe 21 as indicated by an arrow C11. Inflow from. The inlet pipe 21 and the outlet pipe 23 are formed so that their inner diameters are substantially equal, whereas the large diameter pipe 22 disposed between them has an inner diameter of 2 of the inlet pipe 21 and the outlet pipe 23. It is set to about twice. The large-diameter pipe 22 has a branch portion 22a and a junction portion 22b that are openings on the side surfaces thereof.
　熱交換器３０は、流体間で熱交換を行わせる装置であり、排ガス流路１２内に配置されている。熱交換器３０は、薄肉の鋼材によって形成されており、その内部に形成された流路を流れる流体と、熱交換器３０の外部を流れる流体との間で、鋼材を介した熱交換を行わせる。熱交換器３０の側面のうち、冷却装置２０側の一側面には、入口部３１及び出口部３２が形成されている。入口部３１から熱交換器３０内に流入した流体は、内部流路を流れて熱交換を行った後、出口部３２から熱交換器３０外に流出する。 The heat exchanger 30 is a device that exchanges heat between fluids, and is disposed in the exhaust gas flow path 12. The heat exchanger 30 is formed of a thin-walled steel material, and performs heat exchange via the steel material between a fluid flowing through a flow path formed therein and a fluid flowing outside the heat exchanger 30. Make it. An inlet portion 31 and an outlet portion 32 are formed on one side surface of the heat exchanger 30 on the cooling device 20 side. The fluid that has flowed into the heat exchanger 30 from the inlet portion 31 flows through the internal flow path to perform heat exchange, and then flows out of the heat exchanger 30 from the outlet portion 32.
　分岐管４０は、管状の金属製部材であり、その内部には分配流路４１が形成されている。分岐管４０は、排気装置１０と冷却装置２０との間を跨ぐように配置され、その一端部４０ａが熱交換器３０の入口部３１に接続され、他端部４０ｂが冷却装置２０の大径管２２の分岐部２２ａに接続されている。これにより、分配流路４１は、矢印Ｃ１２及びＣ１３で表すように、冷却水流路２４内から分配した冷却水を熱交換器３０へと流す流路を形成している。 The branch pipe 40 is a tubular metal member, and a distribution channel 41 is formed therein. The branch pipe 40 is disposed so as to straddle between the exhaust device 10 and the cooling device 20, one end portion 40 a is connected to the inlet portion 31 of the heat exchanger 30, and the other end portion 40 b is a large diameter of the cooling device 20. It is connected to the branch part 22 a of the tube 22. Thereby, the distribution flow path 41 forms the flow path which flows the cooling water distributed from the inside of the cooling water flow path 24 to the heat exchanger 30, as represented by arrows C12 and C13.
　帰還管５０は、管状の金属製部材であり、その内部には帰還流路５１が形成されている。帰還管５０は、排気装置１０と冷却装置２０との間を跨ぐように配置され、その一端部５０ａが熱交換器３０の出口部３２に接続され、他端部５０ｂが冷却装置２０の大径管２２の合流部２２ｂに接続されている。これにより、帰還流路５１は、矢印Ｃ１４及びＣ１５で表すように、熱交換器３０において熱交換した冷却水を合流部２２ｂから冷却水流路２４内へと戻す流路を形成している。 The return pipe 50 is a tubular metal member, and a return flow path 51 is formed therein. The return pipe 50 is disposed so as to straddle between the exhaust device 10 and the cooling device 20, one end portion 50 a thereof is connected to the outlet portion 32 of the heat exchanger 30, and the other end portion 50 b is a large diameter of the cooling device 20. The tube 22 is connected to the junction 22b. Thereby, the return flow path 51 forms the flow path which returns the cooling water heat-exchanged in the heat exchanger 30 from the confluence | merging part 22b in the cooling water flow path 24, as represented by arrow C14 and C15.
　分配流量調整器６０は、分岐部２２ａと合流部２２ｂとの間の冷却水流路２４内に配置され、ロッド支持部材６１と、ロッド６２と、弁体６３と、弁座部材６４と、コイルばね６５と、を有している。分配流量調整器６０は、冷却水流路２４内を流れる冷却水の温度に応じて弁体６３を移動させることで、冷却水流路２４の通水断面積を変化させる弁装置である。図１では、弁体６３がコイルばね６５によって付勢され、環状の弁座部材６４に押し付けられた状態を表している。この状態では、分配流量調整器６０が配置された部位における冷却水流路２４の通水断面積はゼロとなり、冷却水は分配流量調整器６０を通過することができない。弁体６３は、その端部に凹部６３ａが設けられており、その凹部６３ａ内には、大径管２２に対し固定されたロッド支持部材６１によって支持されるロッド６２が挿入されている。後に詳述するように、この挿入されたロッド６２の先端と凹部６３ａとの間にはワックス６６が充填されており、このワックス６６が冷却水の温度に応じて膨張又は収縮することで、弁体６３をロッド６２に沿って移動させる。 The distribution flow rate regulator 60 is disposed in the cooling water flow path 24 between the branch portion 22a and the merge portion 22b, and includes a rod support member 61, a rod 62, a valve body 63, a valve seat member 64, and a coil spring. 65. The distribution flow rate regulator 60 is a valve device that changes the water flow cross-sectional area of the cooling water passage 24 by moving the valve body 63 according to the temperature of the cooling water flowing in the cooling water passage 24. FIG. 1 shows a state in which the valve body 63 is urged by the coil spring 65 and pressed against the annular valve seat member 64. In this state, the water flow cross-sectional area of the cooling water flow path 24 at the portion where the distribution flow rate regulator 60 is disposed becomes zero, and the cooling water cannot pass through the distribution flow rate regulator 60. The valve body 63 is provided with a recess 63a at an end thereof, and a rod 62 supported by a rod support member 61 fixed to the large-diameter pipe 22 is inserted into the recess 63a. As will be described in detail later, a wax 66 is filled between the tip of the inserted rod 62 and the concave portion 63a, and the wax 66 expands or contracts according to the temperature of the cooling water, so that the valve The body 63 is moved along the rod 62.
　次に、図１に加えて図２を参照して、本発明の実施形態に係る排気熱回収器の動作原理を説明する。図２は、本発明の実施形態に係る排気熱回収器１００の非排気熱回収時の状態を表す断面図である。 Next, the operation principle of the exhaust heat recovery device according to the embodiment of the present invention will be described with reference to FIG. 2 in addition to FIG. FIG. 2 is a cross-sectional view illustrating a state of the exhaust heat recovery device 100 according to the embodiment of the present invention during non-exhaust heat recovery.
　乗用車のエンジンの始動時は、排気熱回収器１００は図１に表す形態となることで排ガスから排気熱を回収し、エンジンの暖機に利用する。以下、この排気熱回収時における排気熱回収器１００の動作について説明する。 When the engine of a passenger car is started, the exhaust heat recovery device 100 takes the form shown in FIG. 1 to recover the exhaust heat from the exhaust gas and use it to warm up the engine. Hereinafter, the operation of the exhaust heat recovery device 100 during the exhaust heat recovery will be described.
　乗用車のエンジンの始動とともに、ポンプによって圧送された冷却水が冷却水流路２４内を流れ始める。このとき、冷却水流路２４内を流れる冷却水の温度はまだ低いため、分配流量調整器６０のワックス６６の温度も低く、その体積は小さい。このため、分配流量調整器６０の弁体６３は、ワックス６６から膨張力を受けることなく、コイルばね６５によって付勢されて弁座部材６４に押し付けられる。これにより、弁体６３と弁座部材６４との間には隙間がないため、分配流量調整器６０が配置された部位における冷却水流路２４の通水断面積はゼロとなり、冷却水は分配流量調整器６０を通過することができない。 As the passenger car engine starts, the cooling water pumped by the pump begins to flow through the cooling water passage 24. At this time, since the temperature of the cooling water flowing through the cooling water flow path 24 is still low, the temperature of the wax 66 of the distribution flow rate regulator 60 is also low and its volume is small. For this reason, the valve body 63 of the distribution flow rate regulator 60 is urged by the coil spring 65 and pressed against the valve seat member 64 without receiving an expansion force from the wax 66. Thereby, since there is no gap between the valve body 63 and the valve seat member 64, the water flow cross-sectional area of the cooling water flow path 24 at the portion where the distribution flow rate regulator 60 is disposed becomes zero, and the cooling water is distributed flow rate. It cannot pass through the regulator 60.
　矢印Ｃ１１で表すように入口管２１内に流入した冷却水は、分配流量調整器６０を通過することできないことで、矢印Ｃ１２で表すように、その全量が分岐部２２ａから分配流路４１内に流入する。次に、冷却水は、矢印Ｃ１３で表すように、分配流路４１を介して入口部３１から熱交換器３０内へと流入する。この冷却水は、熱交換器３０内に形成された流路を流れることで、熱交換器３０の外部を流れる高温の排ガスと間で熱交換を行う。すなわち、冷却水による排気熱の回収が行われる。 The cooling water that has flowed into the inlet pipe 21 as indicated by the arrow C11 cannot pass through the distribution flow rate regulator 60, so that the total amount of the cooling water enters the distribution flow path 41 from the branch portion 22a as indicated by the arrow C12. Inflow. Next, the cooling water flows into the heat exchanger 30 from the inlet 31 through the distribution channel 41 as indicated by an arrow C13. The cooling water exchanges heat with the high-temperature exhaust gas flowing outside the heat exchanger 30 by flowing through the flow path formed in the heat exchanger 30. That is, the exhaust heat is recovered by the cooling water.
　排気熱を回収し、高温となった冷却水は、出口部３２から熱交換器３０外に流出する。次に、冷却水は、矢印Ｃ１４及びＣ１５で表すように、帰還流路５１を介して、分配流量調整器６０の下流側の合流部２２ｂから冷却水流路２４内へと戻される。 The exhaust heat is recovered, and the cooling water that has reached a high temperature flows out of the heat exchanger 30 from the outlet portion 32. Next, as shown by arrows C14 and C15, the cooling water is returned into the cooling water channel 24 from the junction 22b on the downstream side of the distribution flow rate regulator 60 via the return channel 51.
　このようにして排ガスから回収された排気熱は、矢印Ｃ１６で表すように冷却水が出口管２３から流出してエンジンや触媒に至ることで、それらの暖機に利用される。 The exhaust heat recovered from the exhaust gas in this way is used to warm up the cooling water as it flows from the outlet pipe 23 to the engine and catalyst as indicated by the arrow C16.
　排気熱の回収によって冷却水が著しく高温となり、沸騰することを防止するために、冷却水が所定温度に達した後は、排ガスとの熱交換を抑制又は停止させるように制御する必要がある。以下、図２に表すように、排ガスとの熱交換を抑制又は停止させるために、冷却水による排気熱の回収を行わない非排気熱回収時における排気熱回収器１００の動作について説明する。尚、「非排気熱回収時」とは、冷却水による排気熱の回収が全く行われない場合のみならず、冷却水が殆ど昇温しない微量の排気熱の回収を行う場合をも含むものとする。 In order to prevent the cooling water from becoming extremely hot due to the recovery of the exhaust heat and boiling, it is necessary to control the heat exchange with the exhaust gas to be suppressed or stopped after the cooling water reaches a predetermined temperature. Hereinafter, as shown in FIG. 2, the operation of the exhaust heat recovery device 100 during non-exhaust heat recovery in which exhaust heat recovery by cooling water is not performed in order to suppress or stop heat exchange with exhaust gas will be described. Note that “at the time of non-exhaust heat recovery” includes not only the case where exhaust heat is not recovered by cooling water, but also the case where a small amount of exhaust heat is collected where the temperature of the cooling water hardly rises.
　冷却水流路２４内を流れる冷却水が高温になると、分配流量調整器６０の弁体６３の凹部６３ａ内のワックス６６も高温となって溶け始め、その体積が膨張する。ロッド６２の先端と凹部６３ａとの間でワックス６６が体積膨張することにより、弁体６３は、ロッド６２と離反する方向にその膨張力を受けることとなる。このため、ワックス６６から膨張力を受けた弁体６３は、弁体６３を付勢しているコイルばね６５を押し縮めるようにして、ロッド６２に沿って移動する。 When the cooling water flowing in the cooling water flow path 24 becomes high temperature, the wax 66 in the concave portion 63a of the valve body 63 of the distribution flow rate regulator 60 also becomes high temperature and starts to melt, and its volume expands. When the wax 66 is volume-expanded between the tip of the rod 62 and the recess 63 a, the valve body 63 receives the expansion force in a direction away from the rod 62. For this reason, the valve body 63 receiving the expansion force from the wax 66 moves along the rod 62 so as to compress and retract the coil spring 65 that urges the valve body 63.
　この移動により、弁体６３はそれまで押しつけられていた弁座部材６４からも離反し、両者の間に隙間が形成される。すなわち、分配流量調整器６０が配置された部位における冷却水流路２４の通水断面積が増加する。このため、矢印Ｃ２１で表すように入口管２１に流入した冷却水は、その一部が矢印Ｃ２２で表すように大径管２２の分岐部２２ａから熱交換器３０内へと流されるとともに、残りが矢印Ｃ２７で表すように分配流量調整器６０を通過するように分配される。 By this movement, the valve body 63 is separated from the valve seat member 64 that has been pressed so far, and a gap is formed between them. That is, the water flow cross-sectional area of the cooling water flow path 24 at the portion where the distribution flow rate regulator 60 is disposed increases. For this reason, the cooling water that has flowed into the inlet pipe 21 as indicated by the arrow C21 flows into the heat exchanger 30 from the branch portion 22a of the large-diameter pipe 22 as indicated by the arrow C22 and remains. Is distributed so as to pass through the distribution flow regulator 60 as indicated by an arrow C27.
　図１に表した排気熱回収時では、入口管２１に流入した冷却水の全てが熱交換器３０へと流されるのに対し、図２に表した非排気熱回収時では、冷却水の一部のみが熱交換器３０へと流される。したがって、非排気熱回収時では、熱交換器３０における熱交換が抑制されるように冷却水の流量が調整されることとなり、冷却水が沸騰しないよう、冷却水と排ガスとの熱交換を適切に制御することが可能となる。 At the time of exhaust heat recovery shown in FIG. 1, all of the cooling water flowing into the inlet pipe 21 flows to the heat exchanger 30, whereas at the time of non-exhaust heat recovery shown in FIG. Only the part flows to the heat exchanger 30. Therefore, at the time of non-exhaust heat recovery, the flow rate of the cooling water is adjusted so that heat exchange in the heat exchanger 30 is suppressed, and heat exchange between the cooling water and the exhaust gas is appropriately performed so that the cooling water does not boil. It becomes possible to control to.
　また、非排気熱回収時では、熱交換器３０において排ガスと熱交換した冷却水は、矢印Ｃ２４及びＣ２５で表すように、帰還流路５１を介して合流部２２ｂから冷却水流路２４内へと戻される。したがって、非排気熱回収時に出口管２３から流出する冷却水（図２の矢印Ｃ２６）の流量を、排気熱回収時に出口管２３から流出する冷却水（図１の矢印Ｃ１６）の流量から変化させることなく、熱交換器３０へと流される冷却水の流量を調整することが可能となる。すなわち、冷却水を圧送するポンプの複雑な制御を伴うことなく、冷却水と排ガスとの熱交換を適切に制御することが可能となる。 Further, at the time of non-exhaust heat recovery, the cooling water heat-exchanged with the exhaust gas in the heat exchanger 30 is transferred from the merging portion 22b into the cooling water flow path 24 via the return flow path 51 as indicated by arrows C24 and C25. Returned. Therefore, the flow rate of the cooling water (arrow C26 in FIG. 2) flowing out from the outlet pipe 23 during non-exhaust heat recovery is changed from the flow rate of the cooling water (arrow C16 in FIG. 1) flowing out from the outlet pipe 23 during exhaust heat recovery. It becomes possible to adjust the flow volume of the cooling water sent to the heat exchanger 30 without this. That is, it is possible to appropriately control the heat exchange between the cooling water and the exhaust gas without complicated control of the pump that pumps the cooling water.
　また、分配流量調整器６０を冷却水流路２４内に配置することで、全体の構成をコンパクトなものにするとともに、冷却水流路２４内の冷却水の温度変化に高い精度で感応し、冷却水流路２４から分配される冷却水の流量を適切に調整することが可能となる。 Further, by arranging the distribution flow rate regulator 60 in the cooling water flow path 24, the overall configuration is made compact, and the cooling water flow is sensitive to the temperature change of the cooling water in the cooling water flow path 24 with high accuracy. It becomes possible to appropriately adjust the flow rate of the cooling water distributed from the passage 24.
　さらに、分配流量調整器６０は、冷却水流路２４内を流れる冷却水の温度が高い場合に、冷却水流路２４の通水断面積を大きくするため、分配されることなく冷却水流路２４内を流れ続ける冷却水の流量が大きくなる一方、冷却水流路２４内から分配されて熱交換器３０へと流される冷却水の流量が小さくなる。このため、冷却水流路２４内を流れる冷却水の温度が高い場合に、熱交換器３０における熱交換が抑制されるように冷却水の流量を調整し、冷却水と排ガスとの熱交換を適切に制御することが可能となる。 Further, the distribution flow rate regulator 60 increases the flow cross-sectional area of the cooling water passage 24 when the temperature of the cooling water flowing through the cooling water passage 24 is high. While the flow rate of the cooling water that continues to flow increases, the flow rate of the cooling water that is distributed from the cooling water flow path 24 and flows to the heat exchanger 30 decreases. For this reason, when the temperature of the cooling water flowing through the cooling water channel 24 is high, the flow rate of the cooling water is adjusted so that heat exchange in the heat exchanger 30 is suppressed, and heat exchange between the cooling water and the exhaust gas is appropriately performed. It becomes possible to control to.
　以上、具体例を参照しつつ本発明の実施形態について説明した。しかし、本発明はこれらの具体例に限定されるものではない。すなわち、これら具体例に、当業者が適宜設計変更を加えたものも、本発明の特徴を備えている限り、本発明の範囲に包含される。例えば、前述した各具体例が備える各要素およびその配置、材料、条件、形状、サイズなどは、例示したものに限定されるわけではなく適宜変更することができる。また、前述した各実施形態が備える各要素は、技術的に可能な限りにおいて組み合わせることができ、これらを組み合わせたものも本発明の特徴を含む限り本発明の範囲に包含される。 The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.
　１０　：排気装置
　１２　：排ガス流路
　２０　：冷却装置
　２２ａ：分岐部
　２２ｂ：合流部
　２４　：冷却水流路
　３０　：熱交換器
　４１　：分配流路
　５１　：帰還流路
　６０　：分配流量調整器
　１００：排気熱回収器 DESCRIPTION OF SYMBOLS 10: Exhaust device 12: Exhaust gas flow path 20: Cooling device 22a: Branch part 22b: Merge part 24: Cooling water flow path 30: Heat exchanger 41: Distribution flow path 51: Return flow path 60: Distribution flow rate regulator 100: Exhaust flow Heat recovery unit

Claims (3)

  1. 　排ガスとともに排出される熱を回収する排気熱回収器であって、
    　排ガスを流す排ガス流路と、
    　冷却水を流す冷却水流路と、
    　前記排ガス流路内に配置された熱交換器と、
    　前記冷却水流路内の冷却水を、前記冷却水流路に設けられた分岐部から前記熱交換器へと流す分配流路と、
    　前記熱交換器において排ガスと熱交換した冷却水を、前記分岐部よりも下流側の前記冷却水流路に設けられた合流部から前記冷却水流路内へと戻す帰還流路と、
    　前記冷却水流路内から分配し前記分配流路を介して前記熱交換器へと流す冷却水の流量を調整する分配流量調整器と、を備え、
    　前記分配流量調整器は、前記冷却水流路内を流れる冷却水の温度が高い場合は、温度が低い場合に比べて前記熱交換器へと流す冷却水の流量を小さくするように構成されていることを特徴とする排気熱回収器。     An exhaust heat recovery device that recovers heat exhausted with exhaust gas,
    An exhaust gas flow path for flowing exhaust gas;
    A cooling water flow path for flowing cooling water;
    A heat exchanger disposed in the exhaust gas flow path;
    A distribution flow path for flowing the cooling water in the cooling water flow path from the branch portion provided in the cooling water flow path to the heat exchanger;
    A return flow path for returning the cooling water heat-exchanged with the exhaust gas in the heat exchanger from the merging portion provided in the cooling water flow path downstream of the branching portion into the cooling water flow path;
    A distribution flow rate regulator that adjusts the flow rate of cooling water that is distributed from within the cooling water flow channel and flows to the heat exchanger via the distribution flow channel,
    The distribution flow rate regulator is configured to reduce the flow rate of the cooling water flowing to the heat exchanger when the temperature of the cooling water flowing in the cooling water flow path is high compared to when the temperature is low. An exhaust heat recovery device characterized by that.
  2. 　前記分配流量調整器は、前記冷却水流路内に配置されていることを特徴とする請求項１に記載の排気熱回収器。 The exhaust heat recovery device according to claim 1, wherein the distribution flow rate adjuster is disposed in the cooling water flow path.
  3. 　前記分配流量調整器は、前記分岐部と前記合流部との間の前記冷却水流路内に配置され、前記冷却水流路内を流れる冷却水の温度が高い場合は、温度が低い場合に比べて前記冷却水流路の通水断面積を大きくするように構成されていることを特徴とする請求項２に記載の排気熱回収器。 The distribution flow rate adjuster is disposed in the cooling water passage between the branch portion and the merging portion, and when the temperature of the cooling water flowing through the cooling water passage is high, compared to the case where the temperature is low The exhaust heat recovery device according to claim 2, wherein the exhaust water heat recovery device is configured to increase a water flow cross-sectional area of the cooling water passage.
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