US20150027666A1 - Heat exchanger and heat exchange device - Google Patents
Heat exchanger and heat exchange device Download PDFInfo
- Publication number
- US20150027666A1 US20150027666A1 US14/341,012 US201414341012A US2015027666A1 US 20150027666 A1 US20150027666 A1 US 20150027666A1 US 201414341012 A US201414341012 A US 201414341012A US 2015027666 A1 US2015027666 A1 US 2015027666A1
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- US
- United States
- Prior art keywords
- upstream
- downstream
- heat exchanger
- heating medium
- core case
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- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
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- 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
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
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- 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 a heat exchanger and a heat exchange device employing the heat exchanger.
- a heat exchanger is designed to effect heat exchange between a first heating medium that flows along an inner periphery of a heat exchange tube and a second heating medium that flows along an outer periphery of the heat exchange tube. It is known to employ a heat exchanger in a heat exchange device (see JP 2012-184681 A, for example).
- an exhaust heat recovery apparatus 200 known also as a heat exchange device, includes a heat recovery passage 202 in which a heat exchanger 201 is housed for effecting heat exchange, and a bypass 203 branched off from the heat recovery passage 202 and where heat exchange is not performed.
- the heat exchanger 201 is comprised of a core case 211 , a pair of end plates 212 , 213 for closing respective ends of the core case 211 , and a plurality of heat exchange tubes 215 disposed between the two end plates 212 , 213 and allowing an exhaust gas to flow inside thereof. Heat exchange is effected between the exhaust gas that flows through the heat exchange tubes and a medium that flows externally.
- the exhaust heat recovery apparatus 200 employing the heat exchanger 210 is generally mounted to an underside of a floor of a vehicle body. Since a mounting space on the underside of the vehicle body floor is small, it is desired that the exhaust heat recovery apparatus 200 be compact and small. If the heat exchanger 210 is downsized, the exhaust heat recovery apparatus per se becomes compact and small.
- a heat exchanger comprising: a tubular core case; a pair of end plates for closing opposite ends of the core case; and a plurality of heat exchange tubes supported at opposite ends by the end plates and allowing a first heating medium to flow inside thereof, so as to effectuate heat exchange between the first heating medium and a second heating medium flowing along an outer periphery of the heat exchange tubes, wherein one of the end plates is disposed on an upstream side of flow of the first heating medium as an upstream end plate while another one of the end plates is disposed on a downstream side of the flow of the first heating medium as a downstream end plate, the downstream end plate comprises a downstream bottom surface part for supporting downstream end parts of the heat exchange tubes, and a downstream wall part formed integrally with and rising from a peripheral edge of the downstream bottom surface part, and a top end part of the downstream wall part is oriented toward upstream of the flow of the first heating medium.
- the downstream end plate is comprised of the downstream bottom surface part for supporting the heat exchange tubes, and the downstream wall part formed integrally with and rising from the peripheral edge of the downstream bottom surface part, and the top end part of the downstream wall part is disposed in orientation toward an upstream side. Since the top end part of the downstream wall part is oriented toward upstream, the top end part of the downstream wall part is positioned further upstream than the downstream end parts of the heat exchange tubes, whereby the heat exchanger is downsized.
- downstream wall part is joined with the core case only at a top end side thereof.
- the upstream end plate comprise an upstream bottom surface part for supporting upstream end parts of the heat exchange tubes, and an upstream wall part formed integrally with and rising from a peripheral edge of the upstream bottom surface part, and the top end part be oriented toward downstream of the flow of the first heating medium.
- the upstream wall part is joined with the core case only at a top end side thereof.
- the core case have a second heating medium inlet for introducing the second heating medium into the core case, and a guide part be provided in the vicinity of the second heating medium inlet for guiding the second heating medium toward the upstream side of the heat exchange tubes.
- the guide part comprises a sheet-shaped guide plate joined with an inner peripheral surface part of the core case and forming a closed cross section between the guide plate and the inner peripheral surface part of the core case, while the guide plate has a guide aperture formed at an upstream-side end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
- the guide part comprise a sheet-shaped guide plate joined with an outer peripheral surface part of the core case and defining a closed cross section between the guide plate and the outer peripheral surface part of the core case, and the core case have a guide aperture formed at an upstream end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
- the guide aperture is formed at a position corresponding to an inter-layer space of the heat exchange tubes.
- the core case has a recessed part recessed inwardly along a direction of flow of the first heating medium.
- a heat exchange device which comprises: a branching part for allowing passage of an exhaust gas therethrough and branching the exhaust gas into two streams; a first flow passage extending from the branching part; a second flow passage extending from the branching part along the first flow passage; a heat exchanger disposed on the second flow passage for recovering energy from heat of the exhaust gas; and a valve disposed openably/closably on one of the first flow passage and the second flow passage for changing a direction of flow of the exhaust gas, wherein the heat exchanger comprises a heat exchanger according to the first aspect of the invention.
- FIG. 1 is a top plan view illustrating an exhaust heat recovery apparatus employing a heat exchanger according to a first embodiment of the present invention:
- FIG. 2 is a cross-sectional view taken along line 2 - 2 of FIG. 1 ;
- FIG. 3 is a perspective view illustrating the heat exchanger of FIG. 2 ;
- FIG. 4 is an exploded perspective view illustrating a lower case half and a guide plate
- FIG. 5 is a perspective view illustrating the lower case half and the guide plate joined together
- FIG. 6 is a schematic view illustrating an operation of the heat exchanger of FIG. 2 ;
- FIG. 7 is a cross-sectional view illustrating a heat exchanger according to a second embodiment of the present invention.
- FIG. 8 is a perspective view illustrating the heat exchanger of FIG. 7 ;
- FIG. 9 is a cross-sectional view taken along line 9 - 9 of FIG. 7 ;
- FIG. 10 is an exploded perspective view illustrating a lower case half and a guide plate according to the second embodiment of the present invention.
- FIG. 11 is a perspective view illustrating the lower case half and the guide plate, joined together, of FIG. 10 ;
- FIG. 12 is a cross-sectional view illustrating a heat exchanger according to a third embodiment of the present invention.
- FIG. 13 is a cross-sectional view illustrating a conventional, basic arrangement.
- an exhaust heat recovery apparatus 10 heat exchange device
- an exhaust gas inlet 11 for introducing exhaust gas (first heating medium) generated in an internal combustion engine (not shown), a branching part 12 connected to the inlet 11 , a first flow passage 13 connected to the branching part 12 and extending downstream of the inlet 11 , a second flow passage 14 extending from the branching part 12 along the first flow passage 13 , a heat exchanger 30 forming part of the second flow passage 14 for transmitting heat of the exhaust gas to a medium (second heating medium), a thermoactuator 16 connected to the heat exchanger 30 , a valve chamber 17 to which the first and second flow passages 13 , 14 are connected at downstream ends thereof, a discharge outlet 18 connected to the valve chamber 17 for discharging the exhaust gas, and a valve housed in the valve chamber 17 and adapted to close the first flow passage 13 or the second flow passages 14 .
- the valve chamber 17 serves also as a merging part where streams of the exhaust
- valve 19 closes the first flow passage 13 .
- the second flow passage 14 is opened to allow the exhaust gas to pass therethrough.
- the valve 19 closes the second flow passage 14 , whereupon the first flow passage 13 is opened to allow passage of the exhaust gas therethrough.
- a medium introducing pipe 21 (second heating medium introducing pipe) is connected to a side of the heat exchanger 30 for introducing heating medium.
- An actuator support member 22 is connected to the heat exchanger 30 for supporting the thermoactuator 16 .
- a medium discharge pipe 23 (second heating medium discharge pipe) is connected to the actuator support member 22 for discharging the heating medium.
- the medium is introduced into the heat exchanger 30 through the medium introducing pipe 21 .
- the thus-introduced medium receives heat from the exhausted gas within the heat exchanger 30 and discharged through the medium discharge pipe 23 . That is, the heat exchanger 30 recovers energy of the exhaust gas.
- the heat exchanger 30 recovers energy of the exhaust gas.
- the heat exchanger 30 is comprised of a generally square-tube-shaped core case 31 adapted to allow flow of the medium internally, upstream and downstream end plates 32 , 33 mounted so as to close openings at opposite ends of the core case 31 , a heat exchange tube 34 mounted between the upstream and downstream end plates 32 , 33 and adapted to allow passage of the exhaust gas internally, and a fin 35 housed in the heat exchange tube 34 .
- the upstream end plate 32 includes a plurality of heat exchange tubes 34 inserted thereinto.
- the downstream end plate 33 is similarly configured.
- the core case 31 is comprised of a lower case half 41 having a generally U-shape as viewed in front elevation and forming a lower half of the core case 31 , and an upper case half joined with the lower case half 41 to form an upper part of the core case 31 .
- the upper case half 42 is also generally U shaped as view in front elevation.
- the lower case half 41 has a side surface portion 41 a which is provided with a medium inlet 41 b (second heating medium inlet) for introducing medium.
- the medium introducing pipe 21 ( FIG. 1 ) is connected to the medium inlet 41 b.
- the upper case half 42 is comprised of a connecting part 42 a connected to the upstream end plate 32 , the downstream end plate 33 and the lower case half 41 , and a recessed part 42 b recessed inwardly from the connecting part 42 a .
- a medium discharge outlet 42 d (second heating medium discharge outlet) is provided for discharging the medium.
- the actuator support member 22 is connected to the medium discharge outlet 42 d.
- the upstream end plate 32 includes a generally rectangular-shaped upstream bottom surface part 32 a for supporting an upstream end part 34 a of the heat exchange tube 34 , and an upstream wall part 32 b formed integrally with and rising from a peripheral edge of the upstream bottom surface part 32 a.
- the upstream wall part 32 b extends toward downstream from the upstream bottom surface part 32 a.
- Top end part 32 c of the upstream wall part 32 b is located at a downstream-most position.
- the upstream bottom surface part 32 a has a plurality of support holes 32 d for allowing passage of and supporting the heat exchange tube 34 .
- the upstream wall part 32 b Only the top end 32 c is joined with the core case 31 .
- the downstream end plate 33 is configured similarly. Namely, the downstream end plate 33 is comprised of a downstream bottom surface part 33 a having a generally rectangular shape and supporting a downstream end part 34 b of the heat exchange tube 34 , and a downstream wall part 33 b formed integrally with and rising from a peripheral edge of the downstream bottom surface part 33 a.
- the downstream wall part 33 b extends from the downstream bottom surface part 33 a toward upstream.
- Top end part 33 c of the downstream wall part 33 b is located at an upstream-most position.
- the downstream bottom surface part 33 a has a plurality of support holes 33 d for allowing passage of and supporting the heat exchange tube 34 .
- the top end part 33 c is connected to the core case 31 .
- the core case 31 has a recessed part 42 b recessed inwardly along the direction of flow of the exhaust gas. Provision of the recessed part 42 b imparts increased rigidity to the core case 31 . This makes it possible to increase rigidity against the direction of expansion of the medium and hence to impart a prolonged life to the heat exchanger 10 .
- the upstream wall part 32 b Of the upstream wall part 32 b, only the top end part 32 c is connected to the core case 31 . Thus, the peripheral edge of the upstream wall part 32 b is not joined with the core case 31 . As a result, a member for introducing exhaust gas can be connected directly to the peripheral edge of the upstream wall part 32 b. Since direct connection of the heat exchanger 10 with the associated flow passage becomes possible, an additional part for connecting the heat exchange with the associated flow passage will not be required. This leads to the advantage that the number of required parts may be decreased. The same can be said of the downstream end plate 33 .
- the guide part 37 is comprised of a guide plate 50 which is connected to an inner peripheral surface part 31 a of the core case 31 in such a manner as to form a closed cross section between the guide plate 50 and the inner peripheral surface part 31 a.
- the upstream wall part 32 b of the upstream end plate 32 and the downstream wall part 33 b of the downstream end plate 33 desirably have a length in the range of 10 mm to 24 mm.
- the upstream and downstream wall parts 32 b, 33 b are overlapped with respective upstream and downstream parts in an overlap range of 2 mm to 7 mm. Ranges left between the overlap ranges are 6 mm to 10 mm. The portions between the overlap ranges are set to have a length that will not allow them to overlap with their respective weld beads.
- the guide plate 50 is obtained by press-forming a steel sheet into a generally L shape. More specifically, the guide plate 50 is comprised of an introducing part 51 provided at a position corresponding to the medium inlet 41 b so as to cover the medium inlet 41 b, a guide-forming part 52 extending from a lower end of the introducing part 51 laterally of the core case 31 , and a flange part 53 integrally provided at a peripheral edge of the introducing inlet 51 and the guide-forming part 52 and adapted to be joined with the inner peripheral surface part 31 a of the core case 31 .
- the introducing part 51 bulging from the flange part 53 defines, jointly with the guide-forming part 52 , a closed cross-section between the inner peripheral surface part 31 a and the guide-forming part 52 .
- the guide-forming part 52 has a plurality of guide apertures 52 a, 52 a for guiding the medium toward upstream of the heat exchange tube 34 ( FIG. 2 ).
- the introduced medium flows first through the core case 31 toward upstream.
- Flowing through the upstream is the exhaust gas that is yet to be heat-exchanged.
- Efficient heat exchange is enabled by effectuating heat exchange between a non-heat-exchanged, high-temperature exhaust gas and a non-heat-exchanged, low-temperature medium.
- the medium By causing the medium to flow upstream, it becomes possible to suppress an increase in stress that arises by excessive heating of the upstream end plate 32 . This makes it possible to reduce a load applied to the heat exchanger 30 and hence to prolong the life of the heat exchanger 30 .
- the medium may boil by heating it to a high temperature. By making the medium flow upstream, it becomes possible to stably supply the medium upstream and hence to avoid boiling of the medium. As a result, improved heat exchange efficiency is provided.
- the guide part is formed of the guide plate 50 of sheet shape that defines a closed cross section between the plate 50 and the core case 31 and that the upstream end part of the guide plate 50 is provided with the guide apertures 52 a.
- a heat exchanger 230 As shown in (a) of FIG. 6 , a heat exchanger 230 , a known example for comparison, includes an upstream end plate 232 with an upstream wall part 232 b extending from an upstream bottom surface part 232 a toward upstream.
- a downstream end plate 233 includes a downstream wall part 233 b extending from a downstream bottom surface part 233 a toward downstream.
- a top end part 232 c of the upstream wall part 232 b projects forward from the upstream end part 34 a of the heat exchange tube 34 thereby increasing the overall length of the heat exchanger 230 .
- a top end part 233 c of the downstream wall part 233 b projects rearward from the downstream end part 34 b of the heat exchange tube 34 thereby increasing the overall length of the heat exchanger 230 .
- the upstream end plate 32 is comprised of the upstream bottom surface part 32 a supporting the heat exchange tube 34 , and the upstream wall part 34 a formed integrally with and rising from the peripheral edge of the upstream bottom surface part 32 a.
- the top end part 32 c of the upstream wall part 32 b is connected to the core case 31 .
- the top end part 32 c of the upstream wall part 32 b is oriented toward downstream, the top end part 32 c of the upstream wall part 32 b is positioned nearer to downstream than the upstream end part 34 a of the heat exchange tube 34 . As a result, the overall length of the heat exchanger 30 becomes smaller (see ⁇ ), whereby the heat exchanger 30 is downsized.
- the top end part 32 c of the upstream wall part 32 b extends rearward from the upstream end part 34 a of the heat exchange tube 34 and is connected to the core case 31 .
- the core case 31 is made shorter by the length of the upstream wall part 32 b and hence downsized.
- the core case 31 is downsized an amount equivalent to the area and hence the heat exchanger 30 per se is downsized.
- the downstream end plate 33 Since the top end part 33 c of the downstream wall part 33 b is oriented toward upstream, the top end part 33 c of the downstream wall part 33 b is positioned nearer to upstream than the downstream end part 34 b of the heat exchange tube 34 . As a result, the overall length of the heat exchanger 30 is decreased (see ⁇ ) to thereby downsize the heat exchanger 30 .
- top end part 33 c of the downstream wall part 33 b extends forward from the downstream end part 34 b of the heat exchange tube 34 and is joined with the core case 31 .
- the core case 31 is decreased in length by the length of the downstream wall part 33 b, whereby the core case 31 is downsized.
- the upstream side of the inventive heat exchanger 30 became shorter by ⁇ .
- the same discussion is applicable to the downstream end plate 33 .
- the inventive core case 30 became shorter in the downstream side by ⁇ .
- the heat exchanger 30 of the inventive embodiment is made shorter by ⁇ + ⁇ .
- the exhaust heat recovery apparatus 10 per se is made compact. It is desirable that freedom of positioning of the exhaust heat recovery apparatus 10 be increased.
- FIG. 7 illustrates in cross-section a heat exchanger according to a second embodiment of the present invention in correspondence with FIG. 2 .
- the heat exchanger according to the second embodiment differs from the heat exchanger shown in FIG. 2 in that the core case and the guide part are constructed differently.
- the heat exchanger 60 has a core case 61 which is comprised of a lower case half 71 having a generally U shape as seen in front elevation, an upper case half 72 having a generally U shape as seen in front elevation and coupled with the lower case half 71 from above, and a guide plate joined with a side surface and a bottom surface of the lower case half 71 from outside.
- the lower case half 71 is comprised of joining parts 71 a, 71 a joined with the upstream end plate 32 and the downstream end plate 33 , and a recessed part 71 b provided between the joining parts 71 a, 71 a and recessed inwardly.
- the recessed part 71 b is comprised of tapered parts 71 c, 71 c extending inclinedly from end parts of the joining parts 71 a, 71 a, and a planar part 71 d extending between the tapered parts 71 a, 71 c and parallel to the heat exchange tube 34 .
- the guide plate 80 is comprised of an inlet part 81 joined at a position corresponding to a side surface of the lower case half 71 , a guide forming part 82 extending from a lower end of the inlet part 81 in a direction of width of the core case 61 , and a flange part 83 formed integrally with peripheral edges of the inlet part 81 and the guide forming part 82 and joined with an outer peripheral surface part 61 b of the core case 61 .
- the inlet part 81 is provided with a medium inlet (second heating medium inlet) 81 a for introducing the heating medium.
- the medium introducing pipe 21 is connected to the medium inlet 81 a.
- the inlet part 81 and the guide forming part 82 jointly define a closed cross section between them and an outer peripheral surface part 61 b of the core case 61 to thereby provide a guide part 67 .
- the upstream tapered part 71 c is formed with a guide aperture 71 e for guiding the medium toward the upstream of the heat exchange tube 34 .
- a plurality of small apertures 71 f is formed in the planar part 71 d.
- the guide aperture 71 e and the small apertures 71 f are formed at locations between corresponding layers of the heat exchange tube 34 . It becomes possible to make the medium flow toward the interlayer space. By thus making the medium flow directly to locations where flow passage areas are large, the medium flows smoothly. As a result, heat exchange can be effected efficiently.
- the recessed part 71 b is formed to run all around the lower case half 71 .
- the guide part 67 is constructed by covering the thus-formed outer peripheral surface part 61 b of the lower case half 71 with the guide plate 80 .
- the guide aperture 71 e has a size larger than those of the small apertures 71 f.
- the medium fed in through the medium inlet 81 a flows on toward upstream chiefly through the guide aperture 71 e, as shown by arrow ( 6 ).
- a remaining portion of the medium is introduced into the core case 61 through the small apertures 71 f, as shown by arrow ( 7 ).
- the medium is introduce into the core case 61 through the guide aperture 71 e as a major stream and through the small apertures 71 f.
- a heat exchanger 90 includes an upstream end plate 92 which is comprised of an end plate body 101 connected to the core case 31 and having a generally U shape as viewed in cross section, and a support plate 102 connected to the end plate body 101 and supporting the heat exchange tube 34 .
- the end plate body 101 is comprised of an upstream bottom surface part 101 a and an upstream wall part 101 b formed integrally with and rising from a peripheral edge of the upstream bottom surface part 101 a.
- a rectangular aperture 101 c is formed in the upstream bottom surface part 101 a.
- the support plate 102 is joined with the peripheral edge of the rectangular aperture 101 c .
- the support plate 102 has a thickness smaller than that of the end plate 101 .
- the downstream end plate 93 is comprised of an end plate body 106 joined with core case 31 and having a generally U shape as viewed in cross section, and a support plate 107 connected to the end plate body 106 for supporting the heat exchange tube 34 .
- the end plate body 106 is comprised of a downstream bottom surface part 106 a and a downstream wall part 106 b formed integrally with and rising from the peripheral edge of the downstream bottom surface part 106 a.
- a rectangular aperture 106 c is formed in the downstream bottom surface part 106 a .
- a support plate 107 is connected to the peripheral edge of the rectangular aperture 106 c.
- the support plate 107 has a thickness smaller than that of the end plate body 106 .
- the upstream end plate 92 and the downstream end plate 93 are positioned differently in orientation.
- the upstream wall part 101 b is extends from the upstream wall part 101 a toward upstream.
- a top end part 101 d of the upstream wall part 101 b extends in a direction away from the core case 31 .
- the downstream wall part 106 b extends from the downstream bottom surface part 106 a toward upstream.
- a top end part 106 d of the downstream wall part 106 b extends toward the core case 31 .
- the core case 31 can be downsized (see ⁇ of FIG. 6 ). This further leads to downsizing of the heat exchanger 90 .
- heat exchanger of the present invention has thus far been described as being applied to an exhaust heat recovery apparatus, it may readily be applied to an EGR (Exhaust Gas Recirculation) air conditioner, a cogeneration system and a thermoelectric generation system. It may also be applied to other systems than those as above in which heat exchange is carried out between an exhaust gas and a medium.
- EGR exhaust Gas Recirculation
- cogeneration system cogeneration system
- thermoelectric generation system thermoelectric generation system
- part of the heat exchange according to the third embodiment can be applied to the heat exchanger according to the first embodiment. Namely, the embodiments can be combined with one another as necessary.
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A heat exchanger including a tubular core case, a pair of end plates for closing opposite ends of the core case, and a plurality of heat exchange tubes supported at opposite ends thereof by the end plates and allowing flow of a first heating medium inside thereof. One end plate is disposed on an upstream side of the first heating medium as an upstream end plate while the other end plates is disposed on a downstream side of the first heating medium as a downstream end plate. The downstream end plate comprises a downstream bottom surface part for supporting downstream end parts of the heat exchange tubes, and a downstream wall part formed integrally with and rising from a peripheral edge of the downstream bottom surface part, and a top end part of the downstream wall part is oriented toward upstream of the flow of the first heating medium.
Description
- The present invention relates to a heat exchanger and a heat exchange device employing the heat exchanger.
- Generally, a heat exchanger is designed to effect heat exchange between a first heating medium that flows along an inner periphery of a heat exchange tube and a second heating medium that flows along an outer periphery of the heat exchange tube. It is known to employ a heat exchanger in a heat exchange device (see JP 2012-184681 A, for example).
- Referring to
FIG. 13 hereof, explanation will be made as to the heat exchange device disclosed in JP 2012-184681. As shown inFIG. 13 , an exhaustheat recovery apparatus 200, known also as a heat exchange device, includes aheat recovery passage 202 in which a heat exchanger 201 is housed for effecting heat exchange, and abypass 203 branched off from theheat recovery passage 202 and where heat exchange is not performed. - The heat exchanger 201 is comprised of a
core case 211, a pair ofend plates core case 211, and a plurality ofheat exchange tubes 215 disposed between the twoend plates - The exhaust
heat recovery apparatus 200 employing theheat exchanger 210 is generally mounted to an underside of a floor of a vehicle body. Since a mounting space on the underside of the vehicle body floor is small, it is desired that the exhaustheat recovery apparatus 200 be compact and small. If theheat exchanger 210 is downsized, the exhaust heat recovery apparatus per se becomes compact and small. - In addition, in a case in which the
heat exchanger 210 is employed in an apparatus other than the exhaustheat recovery apparatus 200, if theheat exchanger 210 is downsized, this brings the advantage that the apparatus in which theheat exchanger 210 is employed can be positioned with increased freedom. There is therefore a demand for downsizing of a heat exchanger. - According to a first aspect of the present invention, there is provided a heat exchanger comprising: a tubular core case; a pair of end plates for closing opposite ends of the core case; and a plurality of heat exchange tubes supported at opposite ends by the end plates and allowing a first heating medium to flow inside thereof, so as to effectuate heat exchange between the first heating medium and a second heating medium flowing along an outer periphery of the heat exchange tubes, wherein one of the end plates is disposed on an upstream side of flow of the first heating medium as an upstream end plate while another one of the end plates is disposed on a downstream side of the flow of the first heating medium as a downstream end plate, the downstream end plate comprises a downstream bottom surface part for supporting downstream end parts of the heat exchange tubes, and a downstream wall part formed integrally with and rising from a peripheral edge of the downstream bottom surface part, and a top end part of the downstream wall part is oriented toward upstream of the flow of the first heating medium.
- In the above-described inventive arrangement, the downstream end plate is comprised of the downstream bottom surface part for supporting the heat exchange tubes, and the downstream wall part formed integrally with and rising from the peripheral edge of the downstream bottom surface part, and the top end part of the downstream wall part is disposed in orientation toward an upstream side. Since the top end part of the downstream wall part is oriented toward upstream, the top end part of the downstream wall part is positioned further upstream than the downstream end parts of the heat exchange tubes, whereby the heat exchanger is downsized.
- Preferably, the downstream wall part is joined with the core case only at a top end side thereof.
- It is preferred that the upstream end plate comprise an upstream bottom surface part for supporting upstream end parts of the heat exchange tubes, and an upstream wall part formed integrally with and rising from a peripheral edge of the upstream bottom surface part, and the top end part be oriented toward downstream of the flow of the first heating medium.
- Desirably, the upstream wall part is joined with the core case only at a top end side thereof.
- It is preferred that the core case have a second heating medium inlet for introducing the second heating medium into the core case, and a guide part be provided in the vicinity of the second heating medium inlet for guiding the second heating medium toward the upstream side of the heat exchange tubes.
- In a preferred form, the guide part comprises a sheet-shaped guide plate joined with an inner peripheral surface part of the core case and forming a closed cross section between the guide plate and the inner peripheral surface part of the core case, while the guide plate has a guide aperture formed at an upstream-side end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
- It is preferred that the guide part comprise a sheet-shaped guide plate joined with an outer peripheral surface part of the core case and defining a closed cross section between the guide plate and the outer peripheral surface part of the core case, and the core case have a guide aperture formed at an upstream end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
- Desirably, the guide aperture is formed at a position corresponding to an inter-layer space of the heat exchange tubes.
- In a desired form, the core case has a recessed part recessed inwardly along a direction of flow of the first heating medium.
- According to a second aspect of the present invention, there is provided a heat exchange device which comprises: a branching part for allowing passage of an exhaust gas therethrough and branching the exhaust gas into two streams; a first flow passage extending from the branching part; a second flow passage extending from the branching part along the first flow passage; a heat exchanger disposed on the second flow passage for recovering energy from heat of the exhaust gas; and a valve disposed openably/closably on one of the first flow passage and the second flow passage for changing a direction of flow of the exhaust gas, wherein the heat exchanger comprises a heat exchanger according to the first aspect of the invention.
- Certain preferred embodiments of the present invention will be described in detail below, by way of example only, with reference to the accompanying drawings, in which:
-
FIG. 1 is a top plan view illustrating an exhaust heat recovery apparatus employing a heat exchanger according to a first embodiment of the present invention: -
FIG. 2 is a cross-sectional view taken along line 2-2 ofFIG. 1 ; -
FIG. 3 is a perspective view illustrating the heat exchanger ofFIG. 2 ; -
FIG. 4 is an exploded perspective view illustrating a lower case half and a guide plate; -
FIG. 5 is a perspective view illustrating the lower case half and the guide plate joined together; -
FIG. 6 is a schematic view illustrating an operation of the heat exchanger ofFIG. 2 ; -
FIG. 7 is a cross-sectional view illustrating a heat exchanger according to a second embodiment of the present invention; -
FIG. 8 is a perspective view illustrating the heat exchanger ofFIG. 7 ; -
FIG. 9 is a cross-sectional view taken along line 9-9 ofFIG. 7 ; -
FIG. 10 is an exploded perspective view illustrating a lower case half and a guide plate according to the second embodiment of the present invention; -
FIG. 11 is a perspective view illustrating the lower case half and the guide plate, joined together, ofFIG. 10 ; -
FIG. 12 is a cross-sectional view illustrating a heat exchanger according to a third embodiment of the present invention; and -
FIG. 13 is a cross-sectional view illustrating a conventional, basic arrangement. - Reference is made initially to
FIG. 1 . As shown inFIG. 1 , an exhaust heat recovery apparatus 10 (heat exchange device) includes anexhaust gas inlet 11 for introducing exhaust gas (first heating medium) generated in an internal combustion engine (not shown), a branchingpart 12 connected to theinlet 11, afirst flow passage 13 connected to the branchingpart 12 and extending downstream of theinlet 11, asecond flow passage 14 extending from the branchingpart 12 along thefirst flow passage 13, aheat exchanger 30 forming part of thesecond flow passage 14 for transmitting heat of the exhaust gas to a medium (second heating medium), athermoactuator 16 connected to theheat exchanger 30, avalve chamber 17 to which the first andsecond flow passages discharge outlet 18 connected to thevalve chamber 17 for discharging the exhaust gas, and a valve housed in thevalve chamber 17 and adapted to close thefirst flow passage 13 or thesecond flow passages 14. Thevalve chamber 17 serves also as a merging part where streams of the exhaust gas passed through the first and second flow passages merge or meet. - In the state shown in the Figure, the
valve 19 closes thefirst flow passage 13. At this time, thesecond flow passage 14 is opened to allow the exhaust gas to pass therethrough. On the other hand, when thevalve 19 swings on a certain condition, thevalve 19 closes thesecond flow passage 14, whereupon thefirst flow passage 13 is opened to allow passage of the exhaust gas therethrough. - A medium introducing pipe 21 (second heating medium introducing pipe) is connected to a side of the
heat exchanger 30 for introducing heating medium. Anactuator support member 22 is connected to theheat exchanger 30 for supporting thethermoactuator 16. A medium discharge pipe 23 (second heating medium discharge pipe) is connected to theactuator support member 22 for discharging the heating medium. - Namely, the medium is introduced into the
heat exchanger 30 through themedium introducing pipe 21. The thus-introduced medium receives heat from the exhausted gas within theheat exchanger 30 and discharged through themedium discharge pipe 23. That is, theheat exchanger 30 recovers energy of the exhaust gas. Detailed discussion as to theheat exchanger 30 will be made with reference to Figures that follow. - As shown in
FIG. 2 , theheat exchanger 30 is comprised of a generally square-tube-shaped core case 31 adapted to allow flow of the medium internally, upstream anddownstream end plates core case 31, aheat exchange tube 34 mounted between the upstream anddownstream end plates fin 35 housed in theheat exchange tube 34. - Turning now to
FIG. 3 , theupstream end plate 32 includes a plurality ofheat exchange tubes 34 inserted thereinto. Thedownstream end plate 33 is similarly configured. - The
core case 31 is comprised of alower case half 41 having a generally U-shape as viewed in front elevation and forming a lower half of thecore case 31, and an upper case half joined with thelower case half 41 to form an upper part of thecore case 31. Theupper case half 42 is also generally U shaped as view in front elevation. - The
lower case half 41 has aside surface portion 41 a which is provided with amedium inlet 41 b (second heating medium inlet) for introducing medium. The medium introducing pipe 21 (FIG. 1 ) is connected to themedium inlet 41 b. - The
upper case half 42 is comprised of a connectingpart 42 a connected to theupstream end plate 32, thedownstream end plate 33 and thelower case half 41, and arecessed part 42 b recessed inwardly from the connectingpart 42 a. On anupper surface part 42 c of therecessed part 42 b, amedium discharge outlet 42 d (second heating medium discharge outlet) is provided for discharging the medium. Theactuator support member 22 is connected to themedium discharge outlet 42 d. - Turning back to
FIG. 2 , theupstream end plate 32 includes a generally rectangular-shaped upstreambottom surface part 32 a for supporting anupstream end part 34 a of theheat exchange tube 34, and anupstream wall part 32 b formed integrally with and rising from a peripheral edge of the upstreambottom surface part 32 a. Theupstream wall part 32 b extends toward downstream from the upstreambottom surface part 32 a.Top end part 32 c of theupstream wall part 32 b is located at a downstream-most position. - The upstream
bottom surface part 32 a has a plurality of support holes 32 d for allowing passage of and supporting theheat exchange tube 34. Of theupstream wall part 32 b, only thetop end 32 c is joined with thecore case 31. - The
downstream end plate 33 is configured similarly. Namely, thedownstream end plate 33 is comprised of a downstreambottom surface part 33 a having a generally rectangular shape and supporting adownstream end part 34 b of theheat exchange tube 34, and adownstream wall part 33 b formed integrally with and rising from a peripheral edge of the downstreambottom surface part 33 a. Thedownstream wall part 33 b extends from the downstreambottom surface part 33 a toward upstream.Top end part 33 c of thedownstream wall part 33 b is located at an upstream-most position. - The downstream
bottom surface part 33 a has a plurality of support holes 33 d for allowing passage of and supporting theheat exchange tube 34. Of thedownstream wall part 33 b, only thetop end part 33 c is connected to thecore case 31. - The
core case 31 has a recessedpart 42 b recessed inwardly along the direction of flow of the exhaust gas. Provision of the recessedpart 42 b imparts increased rigidity to thecore case 31. This makes it possible to increase rigidity against the direction of expansion of the medium and hence to impart a prolonged life to theheat exchanger 10. - Of the
upstream wall part 32 b, only thetop end part 32 c is connected to thecore case 31. Thus, the peripheral edge of theupstream wall part 32 b is not joined with thecore case 31. As a result, a member for introducing exhaust gas can be connected directly to the peripheral edge of theupstream wall part 32 b. Since direct connection of theheat exchanger 10 with the associated flow passage becomes possible, an additional part for connecting the heat exchange with the associated flow passage will not be required. This leads to the advantage that the number of required parts may be decreased. The same can be said of thedownstream end plate 33. - At a lower part of the
core case 31, there is provided aguide part 37 for guiding the medium toward upstream of theheat exchange tube 34. Theguide part 37 is comprised of aguide plate 50 which is connected to an innerperipheral surface part 31 a of thecore case 31 in such a manner as to form a closed cross section between theguide plate 50 and the innerperipheral surface part 31 a. - The
upstream wall part 32 b of theupstream end plate 32 and thedownstream wall part 33 b of thedownstream end plate 33 desirably have a length in the range of 10 mm to 24 mm. The upstream anddownstream wall parts - As shown in
FIG. 4 , theguide plate 50 is obtained by press-forming a steel sheet into a generally L shape. More specifically, theguide plate 50 is comprised of an introducingpart 51 provided at a position corresponding to themedium inlet 41 b so as to cover themedium inlet 41 b, a guide-formingpart 52 extending from a lower end of the introducingpart 51 laterally of thecore case 31, and aflange part 53 integrally provided at a peripheral edge of the introducinginlet 51 and the guide-formingpart 52 and adapted to be joined with the innerperipheral surface part 31 a of thecore case 31. - The introducing
part 51 bulging from theflange part 53 defines, jointly with the guide-formingpart 52, a closed cross-section between the innerperipheral surface part 31 a and the guide-formingpart 52. At an upstream end part, the guide-formingpart 52 has a plurality ofguide apertures FIG. 2 ). - In the state in which the
guide plate 50 is attached to thelower case half 41, as shown inFIG. 5 , the medium introduced through themedium inlet 41 b, as shown by arrow (1), is guided into the inside of thecore case 31 by the guide-formingpart 52. The medium thus guided into thecore case 31 is caused to flow through theguide apertures core case 31, as shown by arrows (2), (2). - Turning back to
FIG. 2 , the introduced medium flows first through thecore case 31 toward upstream. Flowing through the upstream is the exhaust gas that is yet to be heat-exchanged. Efficient heat exchange is enabled by effectuating heat exchange between a non-heat-exchanged, high-temperature exhaust gas and a non-heat-exchanged, low-temperature medium. - By causing the medium to flow upstream, it becomes possible to suppress an increase in stress that arises by excessive heating of the
upstream end plate 32. This makes it possible to reduce a load applied to theheat exchanger 30 and hence to prolong the life of theheat exchanger 30. The medium may boil by heating it to a high temperature. By making the medium flow upstream, it becomes possible to stably supply the medium upstream and hence to avoid boiling of the medium. As a result, improved heat exchange efficiency is provided. - Note also that the guide part is formed of the
guide plate 50 of sheet shape that defines a closed cross section between theplate 50 and thecore case 31 and that the upstream end part of theguide plate 50 is provided with theguide apertures 52 a. By this simple arrangement, it becomes possible to make the medium flow upstream of theheat exchange tube 34. - As shown in (a) of
FIG. 6 , aheat exchanger 230, a known example for comparison, includes anupstream end plate 232 with anupstream wall part 232 b extending from an upstreambottom surface part 232 a toward upstream. Adownstream end plate 233 includes adownstream wall part 233 b extending from a downstreambottom surface part 233 a toward downstream. - When the
upstream wall part 232 b is oriented toward upstream (leftward), atop end part 232 c of theupstream wall part 232 b projects forward from theupstream end part 34 a of theheat exchange tube 34 thereby increasing the overall length of theheat exchanger 230. - The same discussion is applicable to the
downstream end plate 233. - Namely, when the
downstream wall part 233 b is oriented toward downstream, atop end part 233 c of thedownstream wall part 233 b projects rearward from thedownstream end part 34 b of theheat exchange tube 34 thereby increasing the overall length of theheat exchanger 230. - Reference is now made to
FIG. 6( b) illustrating theheat exchanger 30 according to the inventive embodiment. As shown in the Figure, theupstream end plate 32 is comprised of the upstreambottom surface part 32 a supporting theheat exchange tube 34, and theupstream wall part 34 a formed integrally with and rising from the peripheral edge of the upstreambottom surface part 32 a. Thetop end part 32 c of theupstream wall part 32 b is connected to thecore case 31. - Since the
top end part 32 c of theupstream wall part 32 b is oriented toward downstream, thetop end part 32 c of theupstream wall part 32 b is positioned nearer to downstream than theupstream end part 34 a of theheat exchange tube 34. As a result, the overall length of theheat exchanger 30 becomes smaller (see α), whereby theheat exchanger 30 is downsized. - Note also that the
top end part 32 c of theupstream wall part 32 b extends rearward from theupstream end part 34 a of theheat exchange tube 34 and is connected to thecore case 31. As a result, thecore case 31 is made shorter by the length of theupstream wall part 32 b and hence downsized. - In the arrangement explained above, it is possible to make the medium flow through an area enclosed by the
upstream wall part 32 b and the upstreambottom surface part 32 a. Thecore case 31 is downsized an amount equivalent to the area and hence theheat exchanger 30 per se is downsized. - The same discussion is applied to the
downstream end plate 33. Since thetop end part 33 c of thedownstream wall part 33 b is oriented toward upstream, thetop end part 33 c of thedownstream wall part 33 b is positioned nearer to upstream than thedownstream end part 34 b of theheat exchange tube 34. As a result, the overall length of theheat exchanger 30 is decreased (see β) to thereby downsize theheat exchanger 30. - Note additionally that the
top end part 33 c of thedownstream wall part 33 b extends forward from thedownstream end part 34 b of theheat exchange tube 34 and is joined with thecore case 31. Thecore case 31 is decreased in length by the length of thedownstream wall part 33 b, whereby thecore case 31 is downsized. - Note further that in the arrangement explained above, it is possible to make the medium flow through an area enclosed by the
downstream wall part 33 b and the downstreambottom surface part 33 a. This makes it possible to downsize thecore case 31 by the amount equivalent to the area and hence theheat exchanger 30 as a whole. - As compared with the known example heat exchanger 230 (
FIG. 6( a)), the upstream side of theinventive heat exchanger 30 became shorter by α. The same discussion is applicable to thedownstream end plate 33. Compared to the knowexample heat exchanger 230, theinventive core case 30 became shorter in the downstream side by β. To sum up, theheat exchanger 30 of the inventive embodiment is made shorter by α+β. - Referring also to
FIG. 1 , it will readily be appreciated that by employing theheat exchanger 30 rendered compact as explained above, the exhaustheat recovery apparatus 10 per se is made compact. It is desirable that freedom of positioning of the exhaustheat recovery apparatus 10 be increased. - Discussion will be made next as to a second embodiment of the present invention with reference to
FIGS. 6-11 . -
FIG. 7 illustrates in cross-section a heat exchanger according to a second embodiment of the present invention in correspondence withFIG. 2 . The heat exchanger according to the second embodiment differs from the heat exchanger shown inFIG. 2 in that the core case and the guide part are constructed differently. - As shown in
FIGS. 7 and 8 , theheat exchanger 60 has acore case 61 which is comprised of alower case half 71 having a generally U shape as seen in front elevation, anupper case half 72 having a generally U shape as seen in front elevation and coupled with thelower case half 71 from above, and a guide plate joined with a side surface and a bottom surface of thelower case half 71 from outside. - The
lower case half 71 is comprised of joiningparts upstream end plate 32 and thedownstream end plate 33, and a recessedpart 71 b provided between the joiningparts part 71 b is comprised oftapered parts parts planar part 71 d extending between thetapered parts heat exchange tube 34. - The
guide plate 80 is comprised of aninlet part 81 joined at a position corresponding to a side surface of thelower case half 71, aguide forming part 82 extending from a lower end of theinlet part 81 in a direction of width of thecore case 61, and aflange part 83 formed integrally with peripheral edges of theinlet part 81 and theguide forming part 82 and joined with an outerperipheral surface part 61 b of thecore case 61. - The
inlet part 81 is provided with a medium inlet (second heating medium inlet) 81 a for introducing the heating medium. Themedium introducing pipe 21 is connected to themedium inlet 81 a. - The
inlet part 81 and theguide forming part 82 jointly define a closed cross section between them and an outerperipheral surface part 61 b of thecore case 61 to thereby provide aguide part 67. The upstreamtapered part 71 c is formed with aguide aperture 71 e for guiding the medium toward the upstream of theheat exchange tube 34. In addition, a plurality ofsmall apertures 71 f, smaller than theguide aperture 71 e, is formed in theplanar part 71 d. - As shown in
FIG. 9 , theguide aperture 71 e and thesmall apertures 71 f are formed at locations between corresponding layers of theheat exchange tube 34. It becomes possible to make the medium flow toward the interlayer space. By thus making the medium flow directly to locations where flow passage areas are large, the medium flows smoothly. As a result, heat exchange can be effected efficiently. - Referring now to
FIG. 10 , the recessedpart 71 b is formed to run all around thelower case half 71. Theguide part 67 is constructed by covering the thus-formed outerperipheral surface part 61 b of thelower case half 71 with theguide plate 80. - As can be appreciated from
FIG. 11 , theguide aperture 71 e has a size larger than those of thesmall apertures 71 f. Thus, the medium fed in through themedium inlet 81 a, as shown by arrow (5), flows on toward upstream chiefly through theguide aperture 71 e, as shown by arrow (6). On the other hand, a remaining portion of the medium is introduced into thecore case 61 through thesmall apertures 71 f, as shown by arrow (7). The medium is introduce into thecore case 61 through theguide aperture 71 e as a major stream and through thesmall apertures 71 f. As a result, it becomes possible for the medium to flow into thecore case 61 in larger quantity, thereby enabling efficient heat exchange. - Explanation will be made next as to a third embodiment of the present invention with reference to
FIG. 12 wherein the construction of a heat exchanger according to the third embodiment is shown in cross section in correspondence with the arrangement ofFIG. 2 . - As shown in
FIG. 12 , aheat exchanger 90 includes anupstream end plate 92 which is comprised of anend plate body 101 connected to thecore case 31 and having a generally U shape as viewed in cross section, and asupport plate 102 connected to theend plate body 101 and supporting theheat exchange tube 34. - The
end plate body 101 is comprised of an upstreambottom surface part 101 a and anupstream wall part 101 b formed integrally with and rising from a peripheral edge of the upstreambottom surface part 101 a. Arectangular aperture 101 c is formed in the upstreambottom surface part 101 a. Thesupport plate 102 is joined with the peripheral edge of therectangular aperture 101 c. Thesupport plate 102 has a thickness smaller than that of theend plate 101. - The same discussion is applied to the
downstream end plate 93. Thedownstream end plate 93 is comprised of anend plate body 106 joined withcore case 31 and having a generally U shape as viewed in cross section, and asupport plate 107 connected to theend plate body 106 for supporting theheat exchange tube 34. - The
end plate body 106 is comprised of a downstreambottom surface part 106 a and adownstream wall part 106 b formed integrally with and rising from the peripheral edge of the downstreambottom surface part 106 a. Arectangular aperture 106 c is formed in the downstreambottom surface part 106 a. Asupport plate 107 is connected to the peripheral edge of therectangular aperture 106 c. Thesupport plate 107 has a thickness smaller than that of theend plate body 106. - The
upstream end plate 92 and thedownstream end plate 93 are positioned differently in orientation. In theupstream end plate 92, theupstream wall part 101 b is extends from theupstream wall part 101 a toward upstream. As a result, atop end part 101 d of theupstream wall part 101 b extends in a direction away from thecore case 31. On the other hand, in thedownstream end plate 93, thedownstream wall part 106 b extends from the downstreambottom surface part 106 a toward upstream. As a result, atop end part 106 d of thedownstream wall part 106 b extends toward thecore case 31. - Even when the
top end part 106 d of thedownstream wall part 106 b is oriented toward upstream while thetop end part 101 d of theupstream wall part 101 b is not oriented toward downstream as above, advantageous effects aimed at by the present invention can be achieved. In other words, to an extent in which thetop end part 106 d of thedownstream wall part 106 b is oriented toward upstream, thecore case 31 can be downsized (see β ofFIG. 6 ). This further leads to downsizing of theheat exchanger 90. - Hot exhaust gas flows through the
heat exchange tube 34 and the heat of the gas causes thetube 34 to stretch. Since the thickness of thesupport plate 102 is smaller than the thickness of theend plate body 101, thesupport plate 102 has smaller flexural rigidity than theend plate body 101. Thus, compared to theend plate body 101, thesupport plate 102 is liable to bend. Since theheat exchange tube 34 is inserted to a portion liable to bend, stretch of theheat exchange tube 34 can be absorbed by flexure or bend. This makes it possible to reduce a load applied to theheat exchange tube 34 and hence to prolong the life of theheat exchanger 90. The same goes to thedownstream end plate 93. - It should also be appreciated that even when both the
upstream end plate 92 and thedownstream end plate 93 are oppositely oriented, the advantageous effects of the invention can be produced (see α ofFIG. 6 ). Namely, it is possible that thetop end part 101 d of theupstream end plate 92 be joined with thecore case 31 while thetop end part 106 d of thedownstream end plate 93 be disposed to extend away from thecore case 31 toward downstream. - Although the heat exchanger of the present invention has thus far been described as being applied to an exhaust heat recovery apparatus, it may readily be applied to an EGR (Exhaust Gas Recirculation) air conditioner, a cogeneration system and a thermoelectric generation system. It may also be applied to other systems than those as above in which heat exchange is carried out between an exhaust gas and a medium.
- It can also be appreciated by a person skilled in the art that part of the heat exchange according to the third embodiment can be applied to the heat exchanger according to the first embodiment. Namely, the embodiments can be combined with one another as necessary.
- Obviously, various minor changes are possible in light of the above teaching. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described above.
Claims (10)
1. A heat exchanger comprising:
a tubular core case;
a pair of end plates for closing opposite ends of the core case; and
a plurality of heat exchange tubes supported at opposite ends by the end plates and allowing a first heating medium to flow inside thereof, so as to effectuate heat exchange between the first heating medium and a second heating medium flowing along an outer periphery of the heat exchange tubes,
wherein one of the end plates is disposed on an upstream side of flow of the first heating medium as an upstream end plate while another one of the end plates is disposed on a downstream side of the flow of the first heating medium as a downstream end plate,
the downstream end plate comprises a downstream bottom surface part for supporting downstream end parts of the heat exchange tubes, and a downstream wall part formed integrally with and rising from a peripheral edge of the downstream bottom surface part, and a top end part of the downstream wall part is oriented toward upstream of the flow of the first heating medium.
2. The heat exchanger of claim 1 , wherein the downstream wall part is joined with the core case only at a top end side thereof.
3. The heat exchanger of claim 1 , wherein the upstream end plate comprises an upstream bottom surface part for supporting upstream end parts of the heat exchange tubes, and an upstream wall part formed integrally with and rising from a peripheral edge of the upstream bottom surface part, and the top end part is oriented toward downstream of the flow of the first heating medium.
4. The heat exchanger of claim 3 , wherein the upstream wall part is joined with the core case only at a top end side thereof.
5. The heat exchanger of claim 1 , wherein the core case has a second heating medium inlet for introducing the second heating medium into the core case, and a guide part is provided in a vicinity of the second heating medium inlet for guiding the second heating medium toward the upstream side of the heat exchange tubes.
6. The heat exchanger of claim 5 , wherein the guide part comprises a sheet-shaped guide plate joined with an inner peripheral surface part of the core case and forming a closed cross section between the guide plate and the inner peripheral surface part of the core case, and the guide plate has a guide aperture formed at an upstream-side end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
7. The heat exchanger of claim 5 , wherein the guide part comprises a sheet-shaped guide plate joined with an outer peripheral surface part of the core case and defining a closed cross section between the guide plate and the outer peripheral surface part of the core case, and the core case has a guide aperture formed at an upstream end part thereof, through which aperture the second heating medium is guided toward the upstream side of the heat exchange tubes.
8. The heat exchanger of claim 6 , wherein the guide aperture is formed at a position corresponding to an inter-layer space of the heat exchange tubes.
9. The heat exchanger of claim 1 , wherein the core case has a recessed part recessed inwardly along a direction of flow of the first heating medium.
10. A heat exchange device comprising:
a branching part for allowing passage of an exhaust gas therethrough and branching the exhaust gas into two streams;
a first flow passage extending from the branching part;
a second flow passage extending from the branching part along the first flow passage;
a heat exchanger disposed on the second flow passage for recovering energy from heat of the exhaust gas; and
a valve disposed openably/closably on one of the first flow passage and the second flow passage for changing a direction of flow of the exhaust gas,
wherein the heat exchanger comprises a heat exchanger defined in claim 1 .
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JP2013154895A JP5941878B2 (en) | 2013-07-25 | 2013-07-25 | Heat exchanger and heat exchange device |
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US20150027666A1 true US20150027666A1 (en) | 2015-01-29 |
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US14/341,012 Abandoned US20150027666A1 (en) | 2013-07-25 | 2014-07-25 | Heat exchanger and heat exchange device |
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US (1) | US20150027666A1 (en) |
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EP3561426B1 (en) * | 2016-12-20 | 2021-06-09 | Tokyo Roki Co., Ltd. | Heat exchange device |
DE102017216819B4 (en) | 2017-09-22 | 2021-03-11 | Hanon Systems | Exhaust gas cooler and exhaust gas recirculation system with one exhaust gas cooler |
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US10267200B2 (en) | 2015-09-14 | 2019-04-23 | Bosal Emission Control Systems Nv | Heat recovery component for an exhaust gas system of an internal combustion engine |
CN108068572A (en) * | 2016-11-09 | 2018-05-25 | 杭州三花研究院有限公司 | Fluid heat transfer component and vehicle heat management system |
DE102017000183A1 (en) * | 2017-01-12 | 2018-07-12 | Modine Manufacturing Company | Guiding / steering device for heat exchangers flowing through fluid streams |
US20190010849A1 (en) * | 2017-07-10 | 2019-01-10 | Toyota Jidosha Kabushiki Kaisha | Exhaust heat recovery structure |
US10982580B2 (en) * | 2017-07-10 | 2021-04-20 | Toyota Jidosha Kabushiki Kaisha | Exhaust heat recovery structure |
US20190072343A1 (en) * | 2017-09-06 | 2019-03-07 | Borgwarner Emissions Systems Spain, S.L.U. | Compact Heat Exchanger |
US11262143B2 (en) * | 2017-09-06 | 2022-03-01 | Borgwarner Emissions Systems Spain, S.L.U. | Compact heat exchanger |
WO2021116630A1 (en) * | 2019-12-13 | 2021-06-17 | Valeo Systemes Thermiques | Heat exchanger with attached collector |
FR3107344A1 (en) * | 2019-12-13 | 2021-08-20 | Valeo Systemes Thermiques | Heat exchanger with attached collector. |
EP3869025A1 (en) * | 2020-02-21 | 2021-08-25 | Mahle International GmbH | Heat exchanger, in particular exhaust gas cooling device, for cooling exhaust gas from an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
CA2857809A1 (en) | 2015-01-25 |
CA2857809C (en) | 2020-07-21 |
JP5941878B2 (en) | 2016-06-29 |
JP2015025604A (en) | 2015-02-05 |
CN104344753A (en) | 2015-02-11 |
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