CN101251060A - Exhaust heat recovery apparatus - Google Patents

Exhaust heat recovery apparatus Download PDF

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Publication number
CN101251060A
CN101251060A CNA2008100807373A CN200810080737A CN101251060A CN 101251060 A CN101251060 A CN 101251060A CN A2008100807373 A CNA2008100807373 A CN A2008100807373A CN 200810080737 A CN200810080737 A CN 200810080737A CN 101251060 A CN101251060 A CN 101251060A
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CN
China
Prior art keywords
condensation
unit
working fluid
evaporation
evaporation unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2008100807373A
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Chinese (zh)
Inventor
村松宪志郎
宫川雅志
山中保利
井上诚司
小原公和
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Publication of CN101251060A publication Critical patent/CN101251060A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • 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 from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/06—Control arrangements therefor
    • 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
    • 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

Abstract

An exhaust heat recovery apparatus includes an evaporation unit, a condensation unit, an evaporation-side communication part and a condensation-side communication part. The evaporation unit is disposed in an exhaust gas passage through which an exhaust gas flows and performs heat exchange between the exhaust gas and an operation fluid flowing therein, thereby evaporating the operation fluid. The condensation unit is disposed in a coolant passage through which an engine coolant flows and performs heat exchange between the operation fluid and the engine coolant, thereby condensing the operation fluid. The evaporation-side communication part connects the evaporation unit and the condensation unit for introducing evaporated operation fluid to the condensation unit. The condensation-side communication part connects the condensation unit and the evaporation unit for introducing condensed operation fluid to the evaporation unit. The condensation-side communication part is provided with a throttle part.

Description

Exhaust gas heat recovery device
Technical field
The present invention relates to a kind of for example exhaust gas heat recovery device of automobile of vehicle that is used for.
Background technique
Be well known that, utilize heat pipe principle to reclaim, and the heat that is reclaimed is used for other purpose for example engine is heated from the heat of the vent systems exhaust gas discharged of car engine.For example, the public announcement of a patent application No.62-268722 of Japanese unexamined has described a kind of exhaust gas heat recovery device that is used to be used to heat from the heat of the waste gas of engine engine coolant.Particularly, the evaporation unit with heat pipe is arranged in the engine exhaust pipes, and exhaust flow is crossed this engine exhaust pipes, and the condensation unit with heat pipe is arranged in the engine coolant loop, and engine coolant flows through this engine coolant loop.
As another example, Japanese unexamined patent announces that No.4-45393 has described a kind of circulating heat pipe heat exchanger.Disclosed heat exchanger comprises: circulation closed-loop path passage is filled with the internal heat transfer fluid; Be arranged on the evaporation unit on the return passage, be used for passing the ground fluid by the internal heat that the reception external heat is evaporated wherein; And be arranged on condensation unit on the return passage in the position higher than evaporation unit, be used to carry out the internal heat transfer fluid that evaporated and the heat exchange between the external heat transfer fluid.
Fig. 6 shows the example of exhaust gas heat recovery device.In exhaust gas heat recovery device shown in Figure 6, as the evaporation unit J1 and the condensation unit J2 setting adjacent to each other in the horizontal direction of heat exchange unit.The end of the heat pipe J3 of evaporation unit J1 and condensation unit J2 is connected to collector (header) (interconnecting part) J5, makes the heat pipe J3 of evaporation unit J1 be communicated with the heat pipe J3 of condensation unit J2 by collector J5.
In this heat recovering device, the temperature of the engine coolant that raises immediately by the heat that reclaims waste gas is particularly when winter for example cold start-up at engine.Therefore, can improve fuel efficiency and heating operation.On the other hand, under the situation of engine high load, for example during the broiling summer, must limit the heat? recovery of waste gas, overheated to avoid engine.
For example, proposed to be provided with the exhaust gas heat recovery device of valve cell, described valve cell is the diaphragm type valve cell for example, the circulation of the fluid that is used to quit work.The diaphragm type valve cell is made of barrier film and valve body, but the pressure of described barrier film responsive operation fluid and moving, and described valve body is driven by described barrier film.Valve cell limit excessive ground reclaims heat.
Summary of the invention
Make the present invention based on the problems referred to above, the purpose of this invention is to provide a kind of can be with the exhaust gas heat recovery device of the excessive recovery of simple structural limitations heat.
According to an aspect of the present invention, exhaust gas heat recovery device comprises evaporation unit, condensation unit, evaporation side interconnecting part, condensation side interconnecting part and restriction.Evaporation unit is arranged on the waste gas of discharging from engine by its exhaust steam passage that flows, and be used to carry out waste gas and flow through heat exchange between wherein the working fluid, thus vaporized working fluid.The engine coolant that is arranged on condensation unit flows through in wherein the coolant channel, is used for carrying out engine coolant and the heat exchange between the working fluid that evaporation unit evaporates, thus the condensation working fluid.The evaporation side interconnecting part connects described evaporation unit and described condensation unit, is used for the working fluid of evaporation is incorporated into condensation unit from evaporation unit.The condensation side interconnecting part connects described condensation unit and described evaporation unit, is used for the working fluid of condensation is incorporated into evaporation unit from condensation unit.Restriction is arranged in the condensation side interconnecting part.
Described restriction is configured to limit excessive and reclaims exhaust gas heat.Therefore, come the excessive recovery of caloric restriction by restriction with simple structure.
For example, restriction is made of the fixed restriction part with throttle orifice.The extent of opening of throttle orifice that can be by restriction is set and the amount that is sealed in the working fluid in the exhaust gas heat recovery device are determined the upper limit of the amount of the heat that reclaims in the exhaust gas heat recovery device.
As another example, provide described restriction by variable restrictor spare, this variable restrictor spare can flow through the extent of opening of throttle orifice wherein according to the temperature change working fluid of working fluid.
According to a second aspect of the invention, exhaust gas heat recovery device comprises evaporation unit, condensation unit, evaporation side interconnecting part and condensation side interconnecting part.Evaporation unit is arranged on waste gas by in its exhaust steam passage that flows, and be used to carry out waste gas and flow through heat exchange between wherein the working fluid, thus vaporized working fluid.The engine coolant that is arranged on condensation unit flows through in wherein the coolant channel, is used for carrying out engine coolant and the heat exchange between the working fluid that evaporation unit evaporates, thus the condensation working fluid.The evaporation side interconnecting part connects described evaporation unit and described condensation unit, and is defined for working fluid is incorporated into passage the condensation unit from evaporation unit.The condensation side interconnecting part connects described condensation unit and described evaporation unit, and is defined for working fluid is incorporated into passage the evaporation unit from condensation unit.The condensation side interconnecting part comprises the restriction with the aisle spare that reduces.
Therefore, reduce the excessive recovery that the aisle spare of condensation side interconnecting part comes caloric restriction by the part.
Description of drawings
From detailed description with reference to the accompanying drawings, other purpose of the present invention, feature and advantage will become obviously, and wherein, identical parts are represented with identical label:
Fig. 1 is the schematic cross sectional views according to the exhaust gas heat recovery device of first embodiment of the invention;
Fig. 2 A and Fig. 2 B are the schematic diagrams that the operation of exhaust gas heat recovery device as a comparative example is shown;
Fig. 2 C and Fig. 2 D are the schematic diagrams that illustrates according to the operation of first embodiment's exhaust gas heat recovery device;
Fig. 3 A is according to the schematic cross sectional views of the amplification of the evaporation side interconnecting part of the exhaust gas heat recovery device of second embodiment of the invention under the working fluid low temperature condition;
Fig. 3 B is according to the schematic cross sectional views of the amplification of the evaporation side interconnecting part of the exhaust gas heat recovery device of second embodiment of the invention under the working fluid high-temperature condition;
Fig. 4 is the schematic cross sectional views according to the amplification of the condensation side interconnecting part of the exhaust gas heat recovery device of third embodiment of the invention;
Fig. 5 is the schematic cross sectional views of amplification of the condensation side interconnecting part of exhaust gas heat recovery device according to another embodiment of the present invention;
Fig. 6 is the schematic cross sectional views of the exhaust gas heat recovery device of prior art.
Preferred implementation
(first embodiment)
With reference to Fig. 1, the exhaust gas heat recovery device of first embodiment of the invention is applied in the vehicle that is driven by engine (for example, internal-combustion engine), be used to retrieve from the exhaust gas heat of the waste gas of the vent systems of engine and with this heat with helping heat engine etc.
Exhaust gas heat recovery device generally includes evaporation unit 1 and condensation unit 2.Evaporation unit 1 is arranged in first shell 100 that is communicated with the exhaust steam passage (not shown), crosses exhaust steam passage from the exhaust flow of engine emissions.In the present embodiment, for example, first shell 100 is arranged in the outlet pipe, and exhaust flow is crossed outlet pipe.Evaporation unit 1 is carried out waste gas and is flow through heat exchange between wherein the working fluid, thus vaporized working fluid.
Condensation unit 2 is arranged on the outside of outlet pipe.In second shell 200 that condensation unit 2 is arranged on the coolant channel (not shown) of engine is communicated with, engine coolant flows through coolant channel.Condensation unit 2 is carried out the working fluid of evaporation and the heat exchange between the engine coolant in evaporation unit 1, thus the condensation working fluid.Second shell 200 has coolant entrance 201 and coolant outlet 202.Coolant entrance 201 is connected to coolant channel at the downstream position of engine, is used for freezing mixture is incorporated into second shell 200.Coolant outlet 202 is connected to coolant channel at the upstream position of engine, is used for freezing mixture is guided to coolant channel from second shell 200.
For example, in the present embodiment, first shell 100 and second shell 200 are provided with adjacent to each other.In addition, between first shell 100 and second shell 200, be provided with the gap.
Condensation unit 1 has a plurality of evaporation side heat pipe 3a and is connected to evaporation side radiating fin (fin) 4a of the outer surface of heat pipe 3a.For example, radiating fin 4a is a corrugate fin.Among the heat pipe 3a each has the tubular in shape of general flat.The Vertical direction V of longitudinal axis in Fig. 1 that heat pipe 3a is oriented to it for example upper and lower extends upward.In addition, heat pipe 3a is located so that the main axis of the section that limits is arranged essentially parallel to the flow direction of waste gas on the direction of longitudinal axis perpendicular to pipe 3a, for example on the direction perpendicular to the paper of Fig. 1.At pipe stacking direction H for example in the horizontal direction, heat pipe 3a piles up in parallel to each other.
Evaporation unit 1 has evaporation side collector 5a at the two ends of heat pipe 3a.Collector 5a extends on pipe stacking direction H, thereby is communicated with all heat pipe 3a.A collector 5a who is communicated with the upper end of heat pipe 3a is called as the first evaporation side collector 51a, and another collector 5a that is communicated with the lower end of heat pipe 3a is called as the second evaporation side collector 52a.
Condensation unit 2 comprises the condensation side heat pipe 3b and the condensation side radiating fin 4b of the outer surface that is connected to heat pipe 3b.For example, radiating fin 4b is a corrugate fin.Heat pipe 3b is the pipe of general flat.The Vertical direction V of longitudinal axis in Fig. 1 that among the heat pipe 3b each is located so that it for example upper and lower extends upward.In addition, heat pipe 3b is located so that the main axis of the section that limits is arranged essentially parallel to the flow direction of the waste gas of evaporation unit 1 on the direction of longitudinal axis perpendicular to pipe 3b, for example on the direction perpendicular to the paper of Fig. 1.On pipe stacking direction H, for example in the horizontal direction, heat pipe 3b piles up in parallel to each other.
Condensation unit 2 has condensation side collector 5b at the two ends of heat pipe 3b.Collector 5b extends on pipe stacking direction H, thereby is communicated with all heat pipe 3b.A collector 5b who is communicated with the upper end of heat pipe 3b is called as the first condensation side collector 51b, and another collector 5b that is communicated with the lower end of heat pipe 3b is called as the second condensation side collector 52b.
Evaporation side collector 5a is communicated with condensation side collector 5b by interconnecting part 6, and interconnecting part 6 has tubular in shape basically.Therefore, form the loop of sealing by heat pipe 3a and 3b, collector 5a and 5b and interconnecting part 6.This path is filled with and can be evaporated and the working fluid of condensation for example water, alcohol etc.Working fluid is by evaporation unit 1 and condensation unit 2 circulations.
Be positioned at upside and connect the first evaporation side collector 51a and the interconnecting part 6 of the first condensation side collector 51b is called as evaporation side interconnecting part 61.The working fluid of evaporation is incorporated in the condensation unit 2 by evaporation side interconnecting part 61 in evaporation unit 1.
Be positioned at downside and connect the second evaporation side collector 52a and another interconnecting part 6 of the second condensation side collector 52b is called as condensation side interconnecting part 62.The working fluid of condensation is incorporated in the evaporation unit 1 by condensation side interconnecting part 62 in condensation unit 2.
Condensation side interconnecting part 62 has the fixed restriction part 7a as restriction.In the present embodiment, throttle ele-ment 70 is arranged in the condensation side interconnecting part 62, provides fixed restriction part 7a by throttle ele-ment 70.That is to say that the aisle spare (for example, cross-section area) that the working fluid that throttle ele-ment 70 is set to make condensation flows through passage wherein reduces partly in condensation side interconnecting part 62.
Throttle ele-ment 70 forms the throttle orifice with the cross section that reduces.For example, throttle ele-ment 70 has such shape, makes the cross-section area of throttle orifice reduce gradually and increase gradually from middle part downstream end to intermediate portion from upstream extremity with respect to flowing of the operating fluid of condensation.Throttle ele-ment 70 has the first tapered tubular wall 701 and the second tapered tubular wall 702, the internal diameter of the first tapered tubular wall 701 reduces the position from upstream position downstream with respect to flowing of working fluid, and the second tapered tubular wall 702 extends continuously from the downstream of the first tapered tubular wall 701.The internal diameter of the second tapered tubular wall 702 increases the position from upstream position downstream with respect to flowing of working fluid.
Then, will the operation of exhaust gas heat recovery device be described.Fig. 2 A and Fig. 2 B are the schematic diagrams that the operation of the exhaust gas heat recovery device that does not have restriction as a comparative example is shown.Fig. 2 C and Fig. 2 D are the schematic diagrams that the operation of exhaust gas heat recovery device of the present invention is shown.
The amount Qin that Fig. 2 A and Fig. 2 C show the heat that is incorporated into the waste gas in the exhaust gas heat recovery device is the situation of the first value Q1.The amount Qin that Fig. 2 B and Fig. 2 D show the heat of waste gas is the situation greater than the second value Q2 of the first value Q1.In Fig. 2 A to Fig. 2 D,, represent a plurality of evaporation side heat pipe 3a simply by single heat pipe 3a for the ease of explaining.Similarly, by single heat pipe 3b a plurality of condensation side heat pipe 3b are shown simply.In addition, in Fig. 2 A to Fig. 2 D, omitted expression to radiating fin 4a, 4b and first shell 100 and second shell 200.
The working fluid of evaporation flows in condensation unit 2 by evaporation side interconnecting part 61 in evaporation unit 1.In condensation unit 2, working fluid is condensed and liquefies.Liquefied working fluid flows in evaporation unit 1 by condensation side interconnecting part 62.
Because the evaporation of working fluid in evaporation unit 1 and the balance of the condensation of working fluid in condensation unit 2, so between evaporation unit 1 and condensation unit 2, produce the water-head h of working fluid.Working fluid turns back to the evaporation unit 1 from condensation unit 2 owing to water-head h.Like this, working fluid circulates in exhaust gas heat recovery device.
In the exhaust gas heat recovery device shown in Fig. 2 A, the pressure loss Δ P1 of the backflow of working fluid and water-head h satisfy relation of plane down:
ΔP1＝ρgh
In the superincumbent equation, ρ represents the density of liquid phase working fluid, and g represents gravity accleration.Here, the density p of working fluid and gravity acceleration g are constant.Therefore, when the amount Qin of the heat of waste gas was constant, water-head h was determined by pressure loss Δ P1.Qout represents to be delivered to the amount of the heat of the freezing mixture in the condensation unit 2.
Shown in Fig. 2 B, when the amount Qin of the heat of waste gas increased, the amount of the backflow of working fluid increased.Like this, the flow velocity of working fluid increases.Therefore, the pressure loss Δ P1 of the backflow of working fluid increases, thereby water-head h increases.
In the present embodiment shown in Fig. 2 C, because condensation side interconnecting part 62 is provided with fixed restriction part 7a, so the pressure loss Δ P2 sum that the pressure loss Δ P ' of the backflow of working fluid is caused by pressure loss Δ P1 and fixed restriction part (that is Δ P '=Δ P1+ Δ P2) is determined.In this case, the amount that the water-head h2 between evaporation unit 1 and the condensation unit 2 is bigger than the water-head h of the exhaust gas heat recovery device shown in Fig. 2 A is the pressure loss Δ P2 of fixed restriction part 7a.
Thereby when the amount Qin of the heat of waste gas increased shown in Fig. 2 D, the pressure loss Δ P ' of the backflow of working fluid increased.Like this, making working fluid return required water-head h2 increases.When being difficult to keep making working fluid to return required water-head h2, the amount that turns back to the working fluid of evaporation unit 1 is restricted.The amount of the heat that therefore, reclaims in exhaust gas heat recovery device settles out.
In the present embodiment, fixed restriction part 7a is arranged in the condensation side interconnecting part 62.Opening degree (for example, the aisle spare of the throttle orifice of fixed restriction part 7a) by setting in advance fixed restriction part 7a and the amount that is filled in the working fluid in the exhaust gas heat recovery device are determined the upper limit of the amount of the heat that reclaims in exhaust gas heat recovery device.
Thereby, compare with exhaust gas heat recovery device with the diaphragm type valve cell that constitutes by barrier film, valve body etc., simplified the structure that is used for the limit excessive heat recovery.
(second embodiment)
With reference to Fig. 3 A and Fig. 3 B the second embodiment of the present invention is described.To represent with identical label with parts identical among first embodiment, and it will not be repeated in this description.
In a second embodiment, condensation side interconnecting part 62 is provided with variable restrictor spare 7b as restriction, replaces the fixed restriction part 7a among first embodiment.Variable restrictor spare 7b is configured to be limited to according to the temperature change of working fluid the extent of opening of throttle orifice wherein, that is, and and the cross-section area of the passage of working fluid.
Fig. 3 A shows the situation of variable restrictor spare 7b when the temperature of working fluid is low, and Fig. 3 B shows the situation of temperature when working fluid variable restrictor spare 7b when high.Variable restrictor spare 7b is configured and makes extent of opening reduce according to the temperature increase of working fluid.
In the present embodiment, variable restrictor spare 7b is by making according to the deformable material of environment temperature.For example, the material of variable restrictor spare 7b can be bimetal (bi-metal), marmem etc.In addition, in the present embodiment,, variable restrictor spare 7b makes that the passage of working fluid also not exclusively seals when the temperature of the working fluid that flows through condensation side interconnecting part 62 increases even being configured.
Then, will the operation of second embodiment's exhaust gas heat recovery device be described.When the amount Qin of the heat of waste gas increased, the amount of the heat that reclaims in exhaust gas heat recovery device increased.In the present embodiment, variable restrictor spare 7b is arranged in the condensation side interconnecting part 62.When the amount Qin of the heat of waste gas increased, the temperature of working fluid increased.Thereby the extent of opening of variable restrictor spare 7b reduces along with the increase of the temperature of operating fluid, thereby pressure loss Δ P2 increases.The increase of the amount of the heat that reclaims in exhaust gas heat recovery device like this, is limited in specified point.When the amount Qin of the heat of waste gas further increased, the extent of opening of variable restrictor spare 7b further reduced, thereby pressure loss Δ P2 further increases.As a result, the capacity of reflux of working fluid reduces, thereby the amount of the heat that reclaims in exhaust gas heat recovery device reduces.
In the present embodiment, condensation side interconnecting part 62 is provided with variable restrictor spare 7b, and variable restrictor spare 7b changes extent of opening according to the temperature increase of working fluid.The amount of the heat that therefore, reclaims in exhaust gas heat recovery device reduces according to the increase of the temperature of working fluid.Because when engine is loaded when high, for example in temperature when high of working fluid in summer, the amount of the heat that reclaims in exhaust gas heat recovery device is restricted, so that engine is difficult for is overheated.
(the 3rd embodiment)
With reference to Fig. 4 the third embodiment of the present invention is described.The parts identical with first embodiment will be represented with identical label, and not repeat its description.
As shown in Figure 4, the exhaust gas heat recovery device of present embodiment has the variable restrictor spare 7c in condensation side interconnecting part 62, as restriction.Variable restrictor spare 7c comprises throttle orifice 71, is used to open and close the valve body 72 and the temperature sensitive deformable member 73 of throttle orifice 71.The end wall of the side opposite that one end of deformable member 73 is connected to valve body 72 with throttle orifice 71.The other end of deformable member 73 is connected to the supporting member 74 that is arranged in the condensation side interconnecting part 62.
But deformable member 73 response temperatures distortion.For example, deformable member 73 is configured to thermal expansion when the temperature of the working fluid that passes condensation side interconnecting part 62 surpasses predetermined temperature.For example, deformable member 73 is made greater than hot wax, thermometal or the analog of the thermal expansion coefficient of the metal of condensation side interconnecting part 62 by thermal expansion coefficient.
When the temperature of the working fluid that passes condensation side interconnecting part 62 increased, valve body 72 moved on the direction of the extent of opening that reduces throttle orifice 71.On the other hand, when the temperature of the working fluid that passes condensation side interconnecting part 62 reduced, valve body 72 moved on the direction of the extent of opening that increases throttle orifice 71.In the present embodiment, even valve body 72 is also not exclusively closed throttle orifice 71 when the temperature of the working fluid that passes condensation side interconnecting part 62 increases.
Because condensation side interconnecting part 62 is provided with the variable restrictor spare 7c that increases the extent of opening that changes throttle orifice 71 according to the temperature of working fluid, so the amount of the heat that reclaims in exhaust gas heat recovery device reduces according to the temperature increase of working fluid.Like this, the effect similar to second embodiment will be provided.
(other embodiment)
In first embodiment, throttle ele-ment 70 forms throttle orifices, and the internal diameter of this throttle orifice reduces gradually and increases gradually the position downstream from middle position to the neutral position from upstream position with respect to flowing of working fluid.Yet the shape of the throttle orifice of throttle ele-ment 70 is not limited to above-mentioned shape.For example, throttle ele-ment 70 can have cylinder form, and can have the aisle spare of substantial constant.
In first embodiment, provide fixed restriction part 7a by throttle ele-ment 70.Yet, as shown in Figure 5, can form fixed restriction part 7a by the aisle spare (for example, internal diameter) that the part reduces condensation side interconnecting part 62.In this case, reduced the number of parts.In addition, inner diameter d by fixed restriction part 7a is set and the length L pressure loss Δ P2 that determines fixed restriction part 7a.
In the second and the 3rd embodiment, variable restrictor spare 7b is configured to directly contact working fluid with 7c, and mechanically controls the extent of opening of variable restrictor spare 7b and 7c according to the temperature of working fluid.Alternatively, the temperature that can adopt temperature transducer to detect individually to pass the working fluid of condensation side interconnecting part 62, and variable restrictor spare 7b and the 7c temperature that can be configured to the to detect extent of opening of coming electronic control variable restrictor spare 7b and 7c based on temperature transducer.
In the above embodiments, condensation side interconnecting part 62 is by horizontal location exemplarily.Yet the location of condensation side interconnecting part 62 is not limited thereto.Condensation side interconnecting part 62 can tilt with respect to substantially horizontal.
Other advantage and distortion are expected for a person skilled in the art easily.Therefore, broadly the invention is not restricted to detail, representative device and illustrative example shown and that describe.

Claims (6)

1. exhaust gas heat recovery device comprises:
Evaporation unit, this evaporation unit is arranged in the exhaust steam passage, and the waste gas of discharging from engine flows by described exhaust steam passage, and described evaporation unit is used to carry out waste gas and flows through heat exchange between wherein the working fluid, thus vaporized working fluid;
Condensation unit, this condensation unit is arranged in the coolant channel, engine coolant flows by described coolant channel, and described condensation unit is used for carrying out engine coolant and the heat exchange between the working fluid that evaporation unit evaporates, thus the condensation working fluid;
Connect the evaporation side interconnecting part of described evaporation unit and described condensation unit, it is used for working fluid is incorporated into condensation unit from evaporation unit;
Connect the condensation side interconnecting part of described condensation unit and described evaporation unit, it is used for working fluid is incorporated into evaporation unit from condensation unit; And
Be arranged on the restriction in the described condensation side interconnecting part.
2. exhaust gas heat recovery device according to claim 1, wherein, described restriction comprises the fixed restriction part.
3. exhaust gas heat recovery device according to claim 2, wherein, the aisle spare that reduces described condensation side interconnecting part by the part is provided with described fixed restriction part.
4. exhaust gas heat recovery device according to claim 1, wherein,
Described restriction comprises variable restrictor spare, and this variable restrictor spare is configured to flow through according to the temperature change working fluid of working fluid the extent of opening of throttle orifice wherein.
5. exhaust gas heat recovery device according to claim 4, wherein,
Described variable restrictor spare is configured and makes extent of opening reduce according to the temperature increase of working fluid.
6. exhaust gas heat recovery device comprises:
Evaporation unit, this evaporation unit is arranged in the exhaust steam passage, and the waste gas of discharging from engine flows by described exhaust steam passage, and described evaporation unit is used to carry out waste gas and flows through heat exchange between wherein the working fluid, thus vaporized working fluid;
Condensation unit, this condensation unit is arranged in the coolant channel, engine coolant flows by described coolant channel, and described condensation unit is used for carrying out engine coolant and the heat exchange between the working fluid that evaporation unit evaporates, thus the condensation working fluid;
The evaporation side interconnecting part that connects described evaporation unit and described condensation unit, it is defined for working fluid is incorporated into passage the condensation unit from evaporation unit; And
The condensation side interconnecting part that connects described condensation unit and described evaporation unit, it is defined for working fluid is incorporated into passage the evaporation unit from condensation unit; Wherein
Described condensation side interconnecting part comprises the restriction with the aisle spare that reduces.
CNA2008100807373A 2007-02-19 2008-02-18 Exhaust heat recovery apparatus Pending CN101251060A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007037482 2007-02-19
JP2007037482A JP2008202450A (en) 2007-02-19 2007-02-19 Exhaust heat recovery apparatus

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CN101251060A true CN101251060A (en) 2008-08-27

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US (1) US20080196401A1 (en)
JP (1) JP2008202450A (en)
CN (1) CN101251060A (en)
DE (1) DE102008009212A1 (en)

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CN109974135A (en) * 2019-04-19 2019-07-05 青岛海尔智能技术研发有限公司 A kind of radiator, air-conditioner outdoor unit and air conditioner

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