CN100567712C - Exhaust heat recovery apparatus - Google Patents

Exhaust heat recovery apparatus Download PDF

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Publication number
CN100567712C
CN100567712C CNB2007100967471A CN200710096747A CN100567712C CN 100567712 C CN100567712 C CN 100567712C CN B2007100967471 A CNB2007100967471 A CN B2007100967471A CN 200710096747 A CN200710096747 A CN 200710096747A CN 100567712 C CN100567712 C CN 100567712C
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CN
China
Prior art keywords
radiating fin
pipe
vaporizer
recovery apparatus
heat recovery
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Expired - Fee Related
Application number
CNB2007100967471A
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Chinese (zh)
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CN101050719A (en
Inventor
宫川雅志
中村文昭
羽田野五规
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Denso Corp
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Denso Corp
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Publication of CN101050719A publication Critical patent/CN101050719A/en
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Publication of CN100567712C publication Critical patent/CN100567712C/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 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • 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
    • F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust Silencers (AREA)

Abstract

Vaporizer (110) has pipe (111), and by the thermal evaporation working fluid of waste gas.The heat that condenser (130) distributes working fluid towards freezing mixture, thereby condensation working fluid, and the working fluid of condensation turned back to vaporizer (110).The radiating fin (112) that is used to increase heat transfer area is arranged between the pipe (111), and is connected on the pipe (111).Described radiating fin (112) has steering force and reduces part (112a, 112b), and described steering force reduces part (112a, 112b) according to the thermal expansion difference between pipe (111) on the pipe longitudinal direction, reduces to be applied to the steering force on the radiating fin (112).Described steering force reduces the mid point that part (112a, 112b) is arranged on the radiating fin (112) between the pipe (111).

Description

Exhaust heat recovery apparatus
Technical field
The present invention relates to a kind of exhaust heat recovery apparatus.For example, described recovery plant typically is used to have in the vehicle of internal-combustion engine, and retrieves the used heat from internal-combustion engine.
Background technique
JP-A-120178 has disclosed the exhaust heat recovery apparatus that comprises thermosiphon, and wherein vaporizer and condenser are connected in the loop.Vaporizer comprises a plurality of pipes, and is arranged in the exhaust duct of internal-combustion engine.Condenser is arranged on the coolant side place of internal-combustion engine, and will be from the waste heat recovery of internal-combustion engine in freezing mixture.
In order to improve the heat exchange between the thermal medium and waste gas in the vaporizer, radiating fin is by the outer surface of hard solder to pipe, so that increase area of heat transfer.
Yet, when in high-temp waste gas stream, producing temperature distribution, between pipe, can produce temperature difference according to temperature distribution.Therefore, between pipe, can produce thermal expansion difference, and tension load can be applied on the radiating fin.For example, can generation break in the fillet (or being referred to as the leg flange) between pipe and radiating fin.
Summary of the invention
Consider top and other problem, the purpose of this invention is to provide a kind of exhaust heat recovery apparatus.
According to example of the present invention, a kind of exhaust heat recovery apparatus comprises vaporizer and condenser.Described vaporizer has a plurality of pipes, and described a plurality of pipes arrange that on arranged direction described vaporizer also has radiating fin, and described radiating fin is used to increase heat transfer area.Described vaporizer is by the thermal evaporation working fluid within it from exhaust gas of internal combustion engines.Described condenser is used for the heat that freezing mixture towards internal-combustion engine distributes the working fluid that flows out from vaporizer, thus the condensation working fluid, and the working fluid of condensation turned back to vaporizer.Described radiating fin is being arranged on the arranged direction between a plurality of pipes, and is connected on the outer wall of a plurality of pipes.Described radiating fin has steering force and reduces part, and described steering force reduces part according to the thermal expansion difference between a plurality of pipes on the pipe longitudinal direction, reduces to be applied to the steering force (operation force) on the radiating fin.Described steering force reduces part is arranged in radiating fin on arranged direction mid point.
Therefore, can limit radiating fin owing to the thermal expansion difference between the pipe suffers damage.
Description of drawings
By the detailed description made from reference to the accompanying drawings, of the present invention above and other purpose, feature and advantage become more obvious.Among the figure:
Fig. 1 is the schematic representation that shows according to the exhaust heat recovery apparatus of first embodiment of the invention, and described exhaust heat recovery apparatus is installed in the vehicle;
Fig. 2 is the schematic cross-section view that shows exhaust heat recovery apparatus;
Fig. 3 is the cross sectional view of the amplification of the pipe of exhaust heat recovery apparatus and the lamella that dispels the heat;
Fig. 4 is the cross sectional view of the amplification of the pipe of exhaust heat recovery apparatus and the lamella that dispels the heat;
Fig. 5 is the cross sectional view according to the amplification of the pipe of second embodiment's exhaust heat recovery apparatus and heat radiation lamella;
Fig. 6 is the cross sectional view according to the amplification of the pipe of second embodiment's exhaust heat recovery apparatus and heat radiation lamella; With
Fig. 7 is the schematic cross-section view according to the 3rd embodiment's exhaust heat recovery apparatus.
Embodiment
First embodiment
With reference to Fig. 1-3 exhaust heat recovery apparatus 100 among first embodiment is described below.Described equipment 100 is used in the vehicle of internal-combustion engine 10 as driving source, and as shown in fig. 1, equipment 100 is arranged between the exhaust duct 11 and waste heat recovering loop 30 of internal-combustion engine 10.
Internal-combustion engine 10 is a water-cooled engine, and comprises exhaust duct 11, crosses described exhaust duct 11 by the exhaust flow that the fuel combustion in the internal-combustion engine 10 produces.Exhaust duct 11 comprises the catalytic converter 12 that cleaning exhaust gas is used.In addition, internal-combustion engine 10 comprises that radiator loop 20, waste gas reclaim loop 30 and heater loop 40.Circulate in the freezing mixture of cooling internal combustion engines 10 usefulness each in radiator loop 20 and waste gas recovery loop 30.Heater loop 40 is by using the thermoregulator air of freezing mixture (warm water) heating carrying out.
Radiator loop 20 comprises radiator 21; Water pump 22, described water pump 22 is used to make circulate coolant; Passage 23, described passage 23 is used for bypass radiator 21; With thermostat 24.Radiator 21 is by cooling off freezing mixture with the outside air heat-shift.Thermostat 24 control flows are crossed the amount of coolant of radiator 21 and are flow through the amount of coolant of passage 23.Especially, when carrying out the preheating of internal-combustion engine 10, the amount that flows through the freezing mixture of passage 23 increases, thereby promotes the preheating of internal-combustion engine 10.That is, can reduce the cold excessively of the freezing mixture that causes by radiator 21.
Waste heat recovering loop 30 is in the outlet and radiator loop 20 branches of internal-combustion engine 10, and is connected to water pump 22.Because water pump 22, freezing mixture can circulate.The water tank 140 of recovery plant 100 (condenser 130) is connected to and reclaims loop 30.Water tank 140 (condenser 130) will be described below.
Freezing mixture (warm water) is discharged into heater loop 40 in the position different with radiator loop 20 from internal-combustion engine 10, and heater loop 40 is attached to the downstream side of waste heat recovering loop 30.Heater core (core) 41 is arranged in the air-conditioner housing (not shown) of air-conditioning unit.Carry out thermoregulator air and send, and heater core 41 carries out thermoregulator air by heating with the warm water heat-shift by the fan (not shown).
As shown in Figure 2, recovery plant 100 comprises the heating pipe 101 of loop-type, and vaporizer 110 and condenser 130 are connected to each other by connecting passage 115 and return flow line 135 in heating pipe 101.Vaporizer 110 is arranged in the conduit (duct) 120, and condenser 130 is arranged in the water tank 140.
Heating pipe 101 has the filling part (not shown), and is evacuated (step-down) by filling part.Then, working fluid (water) is filled in the heating pipe 101 by filling part.After this, the filling part of heating pipe 101 is sealed.Glassware for drinking water has 100 ℃ boiling point under a barometric pressure.Yet the glassware for drinking water in the heating pipe 101 has 5 to 10 ℃ boiling point, and this is because heating pipe 101 is pumped down to for example 0.01 barometric pressure.In addition, except water, alcohol, fluorocarbon or chlorofluorocarbon can be used as working fluid.
The part of recovery plant 100 (back will be described) is made by having corrosion resistant high performance stainless steel material.After described part was assembled, described part used the hard solder material to be welded on joint or mating part integratedly.
Vaporizer 110 comprises pipe 111, radiating fin 112, under casing 113 and top case 114.Pipe 111 is the light wall pipe road of the length of flat pattern, and manages 111 longitudinal direction corresponding to the above-below direction among Fig. 2.On pipe 111 width directions that are arranged in corresponding to the left and right directions among Fig. 2, and between pipe 111, predetermined tube pitch (at interval) is set.In addition, pipe 111 is arranged on the thickness direction perpendicular to the longitudinal direction of pipeline and width direction.
The radiating fin of being made by thin-walled material 112 is being arranged on the width direction between the pipe 111, and is connected to each outer wall (face) of pipe 111.Below radiating fin 112 will be described.
Under casing 113 is flat container, and is arranged on the bottom of pipe 111 in a longitudinal direction.Top case 114 is flat container, and is arranged on the top of pipe 111 in a longitudinal direction.In under casing 113 and the top case 114 each has the hole (not shown), and manages 111 and be inserted in the hole, so that be connected to case 113,114.Thus, pipe 111 can be communicated with case 113,114.
Vaporizer 110 is arranged in the conduit 120.Conduit 120 is the cylinder of rectangular cross section, and the inside of waste gas ground as described below inflow catheter 120.Vaporizer 110 is arranged to the flow direction of thickness direction corresponding to waste gas in conduit 120.
Condenser 130 comprises pipe 131, radiating fin 132, under casing 133 and top case 134.The longitudinal direction of pipe 131 is corresponding to the above-below direction among Fig. 2.Radiating fin 132 forms crank shape, and is being arranged to be connected on the pipe 131 between the pipe 131.Thereby pipe 131 is connected to case 133,134 and is communicated with case 133,134.
Condenser 130 is arranged in the water tank 140.Water tank 140 is the containers that are extended with corresponding to pipe 131 longitudinal direction.Be used for the introducing pipelines 141 that freezing mixture is introduced in the water tank 140 are arranged on an end of water tank 140, and the blowdown piping 142 that is used for outwards discharging freezing mixture is arranged on the other end of water tank 140.
Condenser 130 is arranged on the side of vaporizer 110.The top case 114 of vaporizer 110 is connected by connecting passage 115 with the top case 134 of condenser 130, and described connecting passage 115 is by conduit 120 and water tank 140.In addition, the top case 114 of vaporizer 110 is connected by return flow line 135 with the under casing 133 of condenser 130, and described return flow line 135 is by conduit 120 and water tank 140.Therefore, by the connection under casing 113 in the loop that is linked in sequence with this, pipe 111, top case 114, connecting passage 115, top case 134, pipe 131, under casing 133 and return flow line 135, heating pipe 101 is formed.
Between conduit 120 and the water tank 140 gap is set.The position of connecting passage 115 and return flow line 135 is corresponding to the position in gap, thereby passage 115,135 is operating as the thermal insulation part 121 between vaporizer 110 and the condenser 130.
The thin-walled band plate is processed to form by cylinder and is waveform, thereby makes radiating fin 112 become corrugated.As shown in Figure 3, radiating fin 112 is divided into a plurality of heat radiation lamellas on width direction between pipe 111.At this, in first embodiment, radiating fin 112 is by forming the wall (face) that the brazing fillet is connected to pipe 111.
In addition, the isolating plate of being made by the thin-walled part material 116 is arranged between the heat radiation lamella 1121,1122.Plate 116 is connected on heat radiation in the lamella, and is not connected to another heat radiation lamella.In this embodiment, plate 116 is connected to heat radiation lamella 1122, and is not connected to heat radiation lamella 1121, reduces part 112a (disconnected part) thereby form steering force, and described steering force reduces part 112a and can be shifted with respect to plate 116 and heat radiation lamella 1122.Alternatively, plate 116 can be connected to the heat radiation lamella 11221, thereby and be not connected to the heat radiation lamella 1122 form disconnected part 112a.
As mentioned above, the vaporizer 110 of recovery plant 100 (conduit 120) is arranged in the exhaust duct 11 in catalytic converter 12 downstream sides, and the introducing pipeline 141 of recovery plant 100 and blowdown piping 142 are connected to waste heat recovering loop 30.
Next the operation and the advantage of recovery plant 100 will be described.When internal-combustion engine 10 started, water pump 22 also started, thereby freezing mixture circulates in radiator loop 20, waste heat recovering loop 30 and heater loop 40.The waste gas that produces in the internal-combustion engine 10 flows in exhaust duct 11 and by catalytic converter 12, is discharged into the outside by the vaporizer 110 with receiving unit 100 then.In addition, the water tank 140 (condenser 130) of coolant circulating by recovery plant 100 in waste heat recovering loop 30.
After internal-combustion engine 10 started, the water in the vaporizer 110 of heating pipe 101 absorbed heat from the waste gas of inflow catheter 120, so that be evaporated.Steam rises by pipe 111, and flows in the condenser 130 (top case 134 and pipe 131) by top case 114 and connecting passage 115.Steam in the inflow condenser 130 is by coolant cools, and described freezing mixture flows into water tanks 140 from waste heat recovering loop 30, and is condensed into condensed water.Condensed water turns back to the under casing 113 of vaporizer 110 by return flow line 135.
Heat is delivered to water from waste gas, and instant heating is transported to condenser 130 from vaporizer 110.Then, when steam in condenser 130 during condensation, the heat of transmission is dissipated as the latent heat of condensation.Thus, the freezing mixture that flows through waste heat recovering loop 30 is heated in positive mode.That is, internal-combustion engine 10 can be by preheating more effectively.Therefore, the frictional loss of internal-combustion engine can be reduced, and the fuel that is used to improve cold start-up can be reduced.Thus, can improve mileage oil consumption (fuel efficiency).In addition, can improve the performance of heating of freezing mixture being used heater loop 40 (heater core 41) as thermal source.In addition, a part of heat of waste gas guides (transmission) to condenser 130 by the outer wall of heating pipe 101 from vaporizer 110.
In addition, because a plurality of pipe 111 and a plurality of radiating fin 112 are arranged in the vaporizer 110, so be used for to obtain increasing from the area of waste gas reception heat.Therefore, the evaporation of working fluid can be quickened in vaporizer 110, and can increase from vaporizer 110 to condenser by 130 heat output.
In addition, because heat insulating part 121 is arranged between vaporizer 110 and the condenser 130, the coolant cools so the device 110 that can avoid evaporating is condensed in the device 130.Thus, can reduce condensation operation in the vaporizer 110.
In first embodiment, the radiating fin 112 of vaporizer 110 is divided into heat radiation lamella 1121,1122, and disconnected part 112a (steering force reduces part) is arranged between the heat radiation lamella 1121,1122.Because disconnected part 112a, heat radiation lamella 1121,1122 does not connect each other.For example, if exhaust flow has temperature distribution in conduit 120, between pipe 111, will produce temperature difference so, thereby between pipe 111, produce thermal expansion difference.Yet, in this embodiment, because disconnected part 112a can reduce to be applied to the tension force (steering force) on the heat radiation lamella 1121,1122.That is, heat radiation lamella 1121,1122 can be shifted between pipe 111 according to the thermal expansion of pipe 111.Because can reduce to be applied to the steering force on the heat radiation lamella 1121,1122, so the lamella 1121,1122 that can prevent to dispel the heat is damaged.
In addition, because plate 116 is arranged between the heat radiation lamella 1121,1122, so when heat radiation lamella 1121,1122 is assembled between the pipe 111, the crest (trough) of heat radiation lamella 1121 and the trough (crest) of the lamella 1122 that dispels the heat do not overlap each other (contact).Thus, heat radiation lamella 1121,1122 can easily be assembled.
Radiating fin 112 is divided into two heat radiation lamellas 1121,1122.Yet as shown in Figure 4, radiating fin 112 can be divided into three layer 1121,1122,1123.In the case, plate 116 is arranged between the relative heat radiation lamella 1121,1122 (1122,1123).In addition, radiating fin 112 can be divided into four or more layer, and plate 116 can be arranged between the relative heat radiation lamella.
(second embodiment)
With reference to Fig. 5 and 6 second embodiment is described below.In a second embodiment, have only a corrugated fin 112 being arranged on the width direction between the pipe 111.The midpoint of the radiating fin 112 of radiating fin 112 between pipe 111 has curved section 112b (steering force reduces part).Other parts among second embodiment are similar to first embodiment.
As shown in Figure 5, curved section 112b forms by the approximate centre location bending radiating fin 112 between pipe 111, and has the obtuse angle.Yet curved section 112b can have acute angle.Alternatively, as shown in Figure 6, curved section 112b forms by the shape that will bend to alphabetical S at the entire heat dissipation sheet 112 between the pipe 111.
Thereby when when producing thermal expansion difference on the pipe longitudinal direction between pipe 111, steering force is not applied directly on the radiating fin 112 up to when curved section 112b becomes linearity configuration.Thus, can prevent that radiating fin 112 is damaged.
Except the shape shown in Fig. 5 and 6, curved section 112b can form other shape, for example waveform.In addition, radiating fin 112 can be the plate radiating fin except corrugated fin.
(the 3rd embodiment)
Below with reference to Fig. 7 the 3rd embodiment is described.In the 3rd embodiment, the return flow line 135 that connects condenser 130 and vaporizer 110 comprises valve system 150.Other parts among the 3rd embodiment are similar to first and second embodiments.
Valve system 150 is made by barrier film, and opens and closes return flow line 135 according to the internal pressure of for example heating pipe 101.The internal pressure of heating pipe 101 is corresponding to the pressure of working fluid.When the internal pressure of heating pipe 101 during greater than predetermined value, valve system 150 closing volume passages 135.When the internal pressure of heating pipe 101 equals and during less than predetermined value, valve system 150 is opened return flow line 135.
After internal-combustion engine 10 started, coolant temperature increased, and the internal pressure of heating pipe 101 increases gradually.In addition, the internal pressure of heating pipe 101 according to serviceability for example vehicle acceleration, deceleration or stop to change because waste heat changes according to the load of internal-combustion engine 10.
When the internal pressure of heating pipe 101 was equal to or less than predetermined value, valve system 150 was opened return flow line 135.Then, heat is transported to freezing mixture from waste gas.That is, carrying out waste gas reclaims.
After this, when coolant temperature becomes greater than predetermined temperature value (70 ℃) and when the internal pressure of heating pipe 101 during, valve system 150 closing volume passages 135 greater than predetermined value.Thus, stop the backflow of the water of condensation in the heating pipe 101.Then, the water in the vaporizer 110 is by evaporation (vaporizer 110 parches) fully, and steam flows in the condenser 130.In addition, vapor condensation is a water, and the water of condensation is stored in the condenser 130.
That is, stop owing to the heat transmission (waste heat recovery) of vaporizing and condensation is caused.Thus, only carry out transmission of heat (transmission), so that transfer heat to coolant side by the outer wall of heating pipe 101.If the continuation waste heat recovery, exhaust gas temperature is owing to the increase of internal-combustion engine 10 load increases simultaneously, and coolant temperature may increase too much.In the case, exceeded its ability because be applied to load on the radiator 21, radiator 21 may be overheated.Yet, in this embodiment, because can stop waste heat recovery, so that radiator 21 can prevent is overheated.
Be equal to or less than predetermined value if the internal pressure of heating pipe 101 becomes, valve system 150 is just opened return flow line 135 once more, and can restart heat transport (waste heat recovery).
At this, when restarting waste heat recovery, valve system 150 is opened return flow line 135, thereby working fluid turns back to the pipe 111 of vaporizer 110 from condenser 130.At this moment, because valve system 150 and the distance of each pipe between 111 is different, the flow of working fluid dissimilates in pipe 111.Therefore, the temperature distribution in exhaust flow, the difference on the flow of working fluid is easy to generate thermal expansion difference.Then, thermal expansion difference produces steering force, and steering force can damage radiating fin 112.Yet, in this embodiment,, can prevent that radiating fin 112 is damaged because the steering force of radiating fin 112 reduces part (disconnected part 112a and curved section 112b).Thus, when recovery plant 100 comprised valve system 150, it can be effective that steering force reduces part 112a, 112b.
Valve system 150 is the barrier films that open and close return flow line 135 according to the pressure of working fluid.Yet valve system 150 can be to use the temperature control valve (TCV) of wax, and described temperature control valve (TCV) opens and closes return flow line 135 according to the temperature of freezing mixture and working fluid.
(other embodiment)
In the above embodiments, condenser 130 is arranged in the side of vaporizer 110.Yet condenser 130 can be arranged in above the vaporizer 110.In the case, pipe 131 horizontal arrangement of condenser 130.
These changes and modification are understood to be in protection scope of the present invention, and protection scope of the present invention is defined by the claims.

Claims (8)

1, a kind of exhaust heat recovery apparatus (100) comprising:
Vaporizer (110), described vaporizer (110) has a plurality of pipes (111), and described a plurality of pipes (111) are arranged on arranged direction; And radiating fin (112), described radiating fin (112) is used to increase heat transfer area, and described vaporizer (110) is by the thermal evaporation working fluid within it from internal-combustion engine (10) exhaust gas discharged; With
Condenser (130), described condenser (130) are used for the heat that freezing mixture towards internal-combustion engine (10) distributes the working fluid that flows out from vaporizer (110), thus the condensation working fluid, and the working fluid of condensation turned back to vaporizer (110), wherein
Described radiating fin (112) is being arranged on the arranged direction between described a plurality of pipe (111), and is connected on the outer wall of described a plurality of pipe (111),
Described radiating fin (112) has steering force and reduces part, and described steering force reduces part according to the thermal expansion difference between described a plurality of pipes (111) on the pipe longitudinal direction, reduces to be applied to the steering force on the radiating fin (112), and
Described steering force reduces part is arranged on radiating fin (112) on arranged direction mid point.
2, exhaust heat recovery apparatus according to claim 1 (100), wherein
Described radiating fin (112) is for to have the corrugated fin of waveform, and is divided into a plurality of heat radiation lamellas (1121,1122,1123) on arranged direction,
Described steering force reduces part right and wrong attachment portion (112a), thereby relative heat radiation lamella (1121,1122,1123) is not connected to each other, and
Described exhaust heat recovery apparatus (100) further comprises dividing plate (116), and described dividing plate (116) is used to separate relative heat radiation lamella (1121,1122,1123), and wherein said dividing plate (116) only is connected on one deck in the relative heat radiation lamella.
3, exhaust heat recovery apparatus according to claim 1 (100), wherein
Described radiating fin (112) is for to have the corrugated fin of waveform, and is divided into a plurality of heat radiation lamellas (1121,1122,1123) on arranged direction,
When the one deck at least in the relative heat radiation lamella (1121,1122,1123) has steering force when reducing part, relative heat radiation lamella (1121,1122,1123) can be shifted between described a plurality of pipes (111), and
Described exhaust heat recovery apparatus (100) further comprises dividing plate (116), and described dividing plate (116) is used to separate relative heat radiation lamella (1121,1122,1123), and wherein said dividing plate (116) only is connected on one deck in the relative heat radiation lamella.
4, exhaust heat recovery apparatus according to claim 1 (100), wherein
Described steering force reduces part for curved section (112b), locates the mid point bending of radiating fin (112) at described curved section (112b).
5, exhaust heat recovery apparatus according to claim 4 (100), wherein
Described curved section (112b) is in the approximate centre position that is arranged on the radiating fin (112) between described a plurality of pipe (111) on the arranged direction, and
Described curved section (112b) has the obtuse angle.
6, exhaust heat recovery apparatus according to claim 4 (100), wherein
Described curved section (112b) has the shape of alphabetical S.
7, according to claim 5 or 6 described exhaust heat recovery apparatus (100), wherein
Described radiating fin (112) is for having the corrugated fin of waveform.
8, exhaust heat recovery apparatus according to claim 1 (100) further comprises
Valve system (150), described valve system (150) opens and closes return flow line (135) according in the temperature of the temperature of the pressure of working fluid, freezing mixture and working fluid at least one, and working fluid can turn back to vaporizer (110) from condenser (130) by described return flow line (135).
CNB2007100967471A 2006-04-07 2007-04-06 Exhaust heat recovery apparatus Expired - Fee Related CN100567712C (en)

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JP2006106786 2006-04-07
JP2006106786A JP2007278623A (en) 2006-04-07 2006-04-07 Exhaust heat recovery system

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JP2007278623A (en) 2007-10-25
US20070235164A1 (en) 2007-10-11
FR2899960A1 (en) 2007-10-19
CN101050719A (en) 2007-10-10

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