EP2570646B1 - EGR-System mit hoher Gaseintrittstemperatur - Google Patents

EGR-System mit hoher Gaseintrittstemperatur Download PDF

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Publication number
EP2570646B1
EP2570646B1 EP12173479.2A EP12173479A EP2570646B1 EP 2570646 B1 EP2570646 B1 EP 2570646B1 EP 12173479 A EP12173479 A EP 12173479A EP 2570646 B1 EP2570646 B1 EP 2570646B1
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EP
European Patent Office
Prior art keywords
tubular member
inner tubular
gas
cooler
cooling device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12173479.2A
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English (en)
French (fr)
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EP2570646A1 (de
Inventor
Charlies Penny
Paul Downs
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Senior UK Ltd
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Senior UK Ltd
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Classifications

    • 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
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal section
    • 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
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F28D7/06—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 having a single U-bend
    • 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
    • F28D7/10—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 one within the other, e.g. concentrically
    • F28D7/106—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 one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • 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
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements

Definitions

  • the present invention relates to gas heat exchangers, and particularly although not exclusively to exhaust gas re-circulation coolers for use in automotive applications.
  • EP 1 770 250 A2 describes such a exhaust gas heat exchanger.
  • Exhaust gas re-circulation cooling is used extensively on diesel engines to aid the reduction of nitrus oxide emissions. To aid overall emissions reduction, the EGR cooling on diesel engines may also be bypassed so that the re-circulated exhaust gas is not subject to additional cooling.
  • heat exchange from the gas may be required, but under other circumstances it may be undesirable. For example in cold engine conditions, it is desirable not to additionally cool the gas so that the engine can heat up more quickly. Under hot engine conditions, it may be desirable to cool the gas.
  • Exhaust gas re-circulation and the cooling of re-circulating exhaust gases can also be applied in gasoline (petrol) engines. This is of particular use when downsizing a gasoline engine and utilising turbo charging. Cooled exhaust gas re-circulation can help to significantly improve emissions whilst also reducing fuel consumption.
  • a technical challenge of gasoline exhaust gas re-circulation cooling is that the exhaust gas at the inlet to the exhaust gas re-circulation system is much hotter than in the comparable situation with diesel engines.
  • the temperature of re-circulated exhaust gas in a gasoline engine can be up to 1100 °C, but more typically up to around 1000 °C, compared to the equivalent situation in a diesel engine, where the gas temperature at the inlet to the EGR system is typically of the order of up to 650 °C.
  • a common failure mode of diesel exhaust gas re-circulation coolers is that thermal loading causes high stress at the gas inlet interface.
  • FIG. 1 there is illustrated schematically in cut away view the inlet of a known exhaust gas re-circulation cooling device.
  • the device comprises an outer casing 1 having a bulkhead 2 which extends across a with of the outer casing, the bulkhead contains a plurality of gas conduits 3.
  • the outer casing 1 When gas flows the gas conduits expand due to their increased temperature from the gas, the outer casing 1 also expand but at a slower rate and as is at the coolant temperature has a thermal expansion which is less than the thermal expansion of the gas conduits, resulting in high stresses in the bulkhead and the gas conduits, for example as shown at position A in figure 1 .
  • the result can include failure of the bulkheads, failure of the joints between the conduit tubes and the bulkhead, failure of tube to tube joints, and collapse of gas tubes.
  • a typical failure of a tube to bulkhead joint may comprise a crack through the tubular conduit wall, at the position of the weld/braze between the tubular conduit wall and the bulkhead, resulting in fixture of coolant with the exhaust gas re-circulation path.
  • an exhaust gas cooling device comprising:
  • the first EGR cooler represents an improvement on the known EGR coolers by accepting a higher inlet gas temperature, of up to around 700 °C, and by being capable of being subjected to a higher temperature gradient between the gas inlet and gas outlet, over a temperature range of 700 °C to 50 °C or less.
  • the first EGR cooler comprises an external canister housing 200, which may be tubular in shape; the canister having an inlet end 201 having a frusto-conical chamber 202, and an outlet end 203 having a second frusto conical chamber 204; a plurality of conduit tubes 205 positioned length wise within the cooler, through which gas passes from the inlet chamber 202 to the outlet chamber 204, the plurality of gas conduit tubes 205 being secured between first and second bulk heads 206, 207 respectively, which are positioned across a width dimension of the EGR cooler, in a direction tranverse to its main length; and, the outer canister being provided with a coolant inlet pipe 208 and a coolant outlet pipe 209 for passage of coolant through the canister between the bulkheads, and around the plurality of gas conduit tubes 205.
  • Each of the conduit tubes 205 comprises an annually corrugated or helically corrugated metal wall.
  • the corrugations of the gas conduit tubes serve to allow the conduit tubes to expand and contract in an axial direction, absorbing the thermal stresses of expansion and contraction, within the bellows-like shape of the tube, and thereby reducing the stresses and strains due to thermal expansion on the bulkheads 206, 207 respectively.
  • the annular or helical corrugations allow the gas a greater surface area in contact with the metal wall, and therefore increase the efficiency of cooling, since on the other side of the conduit wall, there is provided liquid coolant, to which waste heat is transferred.
  • Respective first and second ends of each of the gas conduit tubes are welded or brazed to the bulkheads 206, 207, which in the best mode, may be circular and disc shaped, and are provided with a plurality of circular apertures, through which the ends of the gas conduit pipe pass.
  • FIG. 3 there is illustrated schematically a second exhaust gas re-circulation cooler device according to a second specific embodiment.
  • the second EGR cooler is similar to the first EGR cooler, except it has a set of annular or helical corrugations on its outer casing, to absorb thermal stresses and strains in an axial and/or skew direction on the external canister housing itself.
  • the second EGR cooler comprises an external canister housing, which is tubular and in the best mode substantially cylindrical in shape.
  • the canister having a gas inlet end 301 and a gas outlet end 302, each of the inlet ends and outlet ends having a frusto-conical chamber 303, 304 respectively; a plurality of conduit tubes 305; an inlet bulkhead 306 and an outlet bulkhead 307, the inlet and outlet bulkheads being positioned respectively adjacent the inlet end and outlet end of the EGR cooler and extending across a width of the internal cavity formed within the external canister housing 300.
  • the outer canister housing is provided with a coolant inlet 308 and a coolant outlet 309 for passing coolant into a chamber surrounding the plurality of conduits 305, between the first and second bulkheads 306, 307.
  • the outer canister 300 is provided with a plurality of helical or annular corrugations, which allow the outer casing to expand or contract in an axial direction, and also allowing a small degree of movement in a skew motion transverse to the main central longitudinal axis of the EGR cooler device.
  • Respective first and second ends of each of the plurality of gas conduits 305 are welded or brazed to the bulkheads, the ends of the gas conduit tubes fitting into circular apertures in the bulkheads, and the material of the ends of the gas conduits being welded or brazed to the bulkheads,
  • FIG 4 there is illustrated schematically a first high temperature EGR cooler device for use upstream in a gas channel, with the first or second lower temperature EGR coolers of figures 1 , 2 or 7 herein, or a standard EGR cooler.
  • the first high temperature EGR cooler 400 comprises an inner tubular member 401, preferably formed of metal, and having a plurality of annular or helically wound corrugations 402, and an outer tubular member 403, in the best mode substantially cylindrical, and having a swaged first end 404, a swaged second end 405, a region of helically wound or annular corrugations 406, an inlet pipe 407 for receiving liquid coolant, and an outlet pipe 408 for draining liquid coolant.
  • an inner tubular member 401 preferably formed of metal, and having a plurality of annular or helically wound corrugations 402, and an outer tubular member 403, in the best mode substantially cylindrical, and having a swaged first end 404, a swaged second end 405, a region of helically wound or annular corrugations 406, an inlet pipe 407 for receiving liquid coolant, and an outlet pipe 408 for draining liquid coolant.
  • the inner tubular member 401 is positioned within side of the outer tubular member 403 so that the two members are located and aligned co-axially, the ends of the inner and outer tubular members being fixed together typically either by welding or brazing, and forming a substantially cylindrical cavity 409 there between, through which coolant fluid may pass.
  • the ends of the gas conduit which are substantially cylindrical, and are fitted into a pair of corresponding circular apertures 411, 412 formed in first and second swaged ends 404 and 405 respectively.
  • the inner tubular member 401 is exposed to hot exhaust gases, typically having a maximum temperature in the range up to 1100 °C. Consequently, the wall of the inner tubular member 401, being relatively thin and of metal, heats up to a high temperature in the absence of any cooling. In figure 4 , there is no direct cooling of the ends of the EGR cooler.
  • the EGR cooler as shown in figure 4 may be capable of reducing the temperature of gas flowing through the inlet from a maximum temperature of around 1100 °C, to a maximum temperature of around 700 °C at the outlet.
  • the ends of the cooler are not directly cooled, since they are welded or brazed together, at their respective ends, and the outer tube is swaged down to an internal diameter which coincides with the external diameter of the inner tube.
  • the inner tubular member and the outer tubular member do not contact each other, except at their respective corresponding ends, where they are connected together.
  • the outer tubular member 403 and the inner tubular member 401 have no contact with each other except at the ends of the cooler device.
  • the cooler device may be fitted into an exhaust system, connecting frst and second connecting pipes to the ends of the cooler device, so that the cooler device forms an integral structural part of the EGR system, without the heed for any further support from other components, for example without any external mountings to body work or to the engine block.
  • the second exhaust gas re-circulation cooler 500 comprises a metallic inner tubular substantially cylindrical member 501, and a co-axially aligned substantially cylindrical tubular outer member 502, surrounding the inner member, and spaced apart therefrom, providing a sealed cavity between the inner and outer members, which provides a fluid fillable jacket around a central passage 503 through the inner tubular member, for cooling hot exhaust gases which pass through the cooling device.
  • the inner tubular member 501 comprises a plurality of annular or helical corrugations 503.
  • the primary purpose of the corrugations is for absorbing expansion and contraction stresses in a direction axially of the inner tubular member, thereby enabling the inner tubular member to operate with an elevated temperature gradient along the cooler, between an inlet temperature of 1100°C maximum and an outlet temperature of around 700 °C maximum.
  • the outer tubular member 502 is also provided with a plurality of annular or helical corrugations 505 for a similar purpose, that is, to absorb axial expansion and contraction and axial stresses and strains between the two ends of the cooler, and to enable the cooler to operate over a temperature gradient between a maximum of around 1100 °C at one end and a maximum temperature of around 700 °C at the other end.
  • the outer tubular member 502 is provided with a fluid inlet tube 506, and a fluid outlet tube 507 for entry and outlet of a liquid coolant which fills the cavity between the inner and outer tubular members.
  • the corrugations also have the effect of increasing the surface area in contact with the hot exhaust gases flowing through the inner tube, and creating local turbulence at the interface between the gas and the tube wall, thereby increasing the heat transfer rate between the gas and the tubular wall.
  • first annular plate member 508 extending between the substantially parallel cylindrical walls of the respective inner and outer tubular members 502, 505.
  • second annular plate member 509 joins the other ends of the inner and outer tubular members.
  • Said annular plates may be formed as part of the gas conduit. Alternatively, said annular plates may be formed as part of the coolant conduit.
  • the ends of the cooler are liquid cooled.
  • the interface components to this embodiment would have a gas path diameter not greater than the diameter of the gas conduit ends, such that said annular plates are not in the gas flow path.
  • the inner tubular member and the outer tubular member do not contact each other, except at their respective corresponding ends, where they are connected together
  • FIG. 6 there is illustrated schematically a third higher temperature exhaust gas re-circulation cooler device according to a fifth specific embodiment.
  • the third cooler device comprises an inner tube 600 manufactured as a single metal piece, which is substantially cylindrical in parts, and is bent at an angle between its inlet and outlet, in the example shown, the tube being bent at an angle of 90°; and an outer tube 601 which surrounds the inner tube, and is also bent at an angle between the inlet and outlet, in the example shown at an angle of 90 °, and which forms a cavity between the inner tube and the outer tube, suitable for through flow of a liquid coolant.
  • the wall of the inner tube 600 is provided with a plurality of annular or helical corrugations 602, with substantially annular corrugations being depicted in the example shown in figure 6 .
  • the purpose of the corrugated undulations in the tubular wall is to absorb stresses and strains due to thermal expansion along the tube, due to the temperature difference of around a maximum of 1100 °C at the inlet, reducing to a maximum of around 700 °C at the outlet.
  • the outer tube 601 is provided with a second plurality of annular or helical corrugations formed in the metallic wall of the outer tube.
  • the purpose of the annular or helical corrugations is to absorb thermal stresses and strains between the inlet and outlet of the cooler, as the cooler heats up and contracts in use.
  • the outer tubular member 601 is swaged down to a smaller diameter, so that an internal diameter of the inlet of the outer tube 601 is substantially the same as the outer diameter of the inner tube 600, so that the tubes can be joined together by welding or brazing, or press forming, so that the cavity 605 between the inner and outer tubular members is sealed to be fluid tight.
  • the outlet end of the cooler is sealed, where the outer tube 601 joins to the inner tube 600, the end of the outer tube 601 being swaged down to a reduced diameter compared to its diameter along the remainder of its length, so as to rigidly secure to the outlet end of the inner tubular member.
  • the outer tubular member is provided with a liquid coolant inlet 606, and a coolant outlet 607.
  • the third cooler device shown in figure 6 has a single bend along its length, however in the general case, such cooler devices are not restricted to a single bend, but may have a plurality of bends, for example so as to form an "S" shape, or other shape having multiple bends, provided that such shape can be formed by a pair- of concentric tubular members, maintaining a cavity there between for passage of coolant fluid in contact with the outer surface of the inner tubular member.
  • the inner tubular member and the outer tubular member do not contact each other, except at their respective corresponding ends, where they are connected together
  • a fourth cooler being a "U" shaped cooler according to a sixth specific embodiment.
  • the cooler is suitable for use as a second, relatively lover temperature cooler in a system as disclosed herein, and capable of receiving exhaust gas at an inlet temperature in the range up to 700°C and capable of cooling the gas to a temperature of 150°C or lower.
  • the fourth cooler comprises a "U" shaped canister 700 (shown in cut away view dashed lines) having a coolant inlet port 701 for inlet of cooling fluid and a coolant outlet port 702 for outlet of the cooling fluid, such that the cooling fluid can flow internally throughout the canister 700; arid one or a plurality of cooling plates 704, each cooling plate comprising a plurality of cooling channels 705 through which a gas may be passed.
  • the canister may be constructed from a single component or from a plurality of components.
  • the one or plurality of cooling plates 704 are attached to the canister directly or via a connector plate 706 at or near the region of the inlet and outlet ports through which gases flow into the U shaped cooler, and are exhausted out of the U shaped cooler.
  • Each conduit is formed in a plate like structure, an exterior surface of which is exposed to coolant fluid within the coolant canister 700 which flows around and between the plates, and the interior of which is exposed to the gas flow.
  • the plurality of plates are connected to each other at one end of the cooler, by being welded or soldered either to each other and the canister or to a connector plate 707.
  • a pair of spacers (one shown at 710) may be fitted to the straight edges of the single or center most cooling plate.
  • the spacers serve as a guide for positioning and locating the outer canister 700, so that the plurality of cooling plates lie within the canister, spaced apart from the edges of the canister, so that each of the cooling plates does not come into direct contact with the canister, there being enough space for passage of coolant fluid between the cooling plate and the canister wall.
  • This has the advantage that as the cooler heats up and cools down, and the canister and cooling plates experience thermal expansion or contraction, because the cooling plates are not physically abutting the canister walls, there are fewer physical stresses due to expansion or cooling, between the cooling plates and the canister wall.
  • the spacers can also act as coolant barriers to direct flow from the coolant inlet spigot to the return end of the cooler and back to the coolant outlet spigot.
  • the gas can either flow across the connector plate 707 bypassing the cooler, or can be directed to flow through the cooler, via the one of plurality of "U" shaped channels 705, so that the gas comes into contact with the cooling walls of the plates, the other sides of which are in contact with the liquid coolant in the canister.
  • a plurality of indents 711 causes the gas to follow a serpentine path within the conduits 705, thereby inducing a greater heat exchange between the gas and the plate walls, with minimum retardation of the gas flow.
  • the cooler may be connected to a gas flow tube which contains a gas bypass valve, and which is actuable via a protruding external shaft.
  • An electrical or vacuum operated actuator mechanism may be attached to the shaft for electrically actuating the bypass valve within the cooling tube either to pass incoming gas through the U shaped cooler, or to bypass the gas from the U shaped cooler altogether.
  • the gas flow tube may connect to the cooler via a flange surface 707, which contains a gas inlet 708 and a gas outlet 709.
  • the cooler and gas flow tube may be welded or brazed together to form a compact unit.
  • the gas flow tube is provided with a plurality of flanges one at each end of the tube, for fitting the tube into a gas flow path of a combustion engine, or other gas flow system, where cooling of the gas may be selectively required.
  • the coolant inlet and outlets 701, 702 are shown in figure 7 as being on a same side of the U shaped cooler. However, in other embodiments, the inlet 701 may be positioned on an opposite side of canister to the outlet 702. Alternatively the inlet 701 and the outlet 702 may be positioned -in any location around the canister but remaining the same distance from the first end of the gas conduits.
  • gas flowing through the gas flow tubes 704 in a direction A-B as shown by the arrows may be directed by the bypass valve either through the U shaped cooler, entering the cooler at the bottom, and passing into the curved periphery of the "U" shaped canister and returning to exit at the top of the cooler and then out of the gas flow tube.
  • the bypass valve is actuated to bypass the cooler, then the gas flow A-B flows straight through the gas flow tube without entering the cooler.
  • the gas flow would enter at the top of the cooler, and exhaust out of the bottom of the cooler.
  • the gas flow were reversed, then the gas may enter the top of the cooler and exhaust through the bottom of the cooler, so that orientation of the U shaped cooler relative to the gas flow can be reversed, without any significant difference in cooling operation.
  • gas bypass valve is placed at an intermediate setting, so that it directs some gas through the cooler and some gas directly from the gas flow tube inlet to the gas flow tube outlet, then a partial cooling of the gas flow may result.
  • FIG 8 there is illustrated schematically an arrangement of an engine and a first exhaust gas re-circulation bypass system according to a seventh specific embodiment herein.
  • An internal combustion engine 800 comprises an inlet manifold 801 for drawing air into the combustion chambers of the engine, and an outlet manifold 802 for channeling exhaust gases out of the engine. Air being input into the inlet manifold may be compressed by a compressor 803. Additionally and optionally, a turbo 204 may be fitted after the exhaust manifold to an exhaust channel 805 of the engine.
  • the engine may be fitted with an exhaust gas re-circulation EGR system.
  • the EGR system comprises a first exhaust gas cooler 806 through which exhaust gases flow, and a second exhaust cooler 807, the first and second exhaust coolers being connected in series.
  • a high pressure exhaust gas re-circulation circuit takes high pressure exhaust gas from the outlet manifold 802, through a feed pipe 808 to the inlet of the first EGR cooler 806, and from an outlet of the second EGR cooler 807, directly to the inlet manifold 801 via a second feed pipe 809.
  • High pressure re-circulated exhaust gas is cooled, but does not pass through the compressor 203 or the turbo 804.
  • An alternative low pressure EGR system takes the exhaust gas downstream of the turbo 804 and feeds it via a third feed pipe 810 to the inlet of the first EGR cooler 806, through the first EGR cooler 806 via a connecting pipe 811 to the inlet of the second EGR cooler 807, and from the outlet of the second EGR cooler 807, to an air channel inlet upstream of compressor 803, via a fourth feed pipe 812.
  • the purpose of the first EGR cooler 806 is to cool the high temperature exhaust gases from a temperature of 1000 to 1100 °C down to a temperature of around 650 °C prior to entry to the second EGR cooler 807. Gas is entering the second EGR cooler 807 at an inlet temperature of around 650 °C may exit the second EGR cooler at a reduced temperature of around 150 °C.
  • the first EGR cooler 806 can be used to cool the exhaust gas from a relatively higher temperature having a maximum temperature in the range 1000 °C - 1100 °C, to a relatively lower temperature of the order of 650 °C. Since the exhaust gas has been cooled prior to entry on the multi gas conduit EGR cooler 807, the multi gas conduit EGR cooler will not suffer cracking of the gas conduits where they connect to the bulkhead inside the EGR cooler.
  • the exhaust gas is taken at a relatively lower pressure, after the turbo 804 and via the second feed pipe 810, through the first and second EGR coolers, and through the second feed pipe 809 directly into the inlet without going through the compressor.
  • high pressure exhaust gas may be taken by the first feed pipe 808 through the first and second EGR coolers 806, 807, and fed into the compressor 803 via four feed pipe 212.
  • the exhaust gas re-circulation system may operate to cool gas from a maximum inlet temperature of 1100°C., to a maximum temperature of around 700 °C at the outlet of the first cooler device. This may not be a highly effective cooler.
  • the first cooler device may be robust so as to withstand thermal shock, thermal loading and thermal growth as experienced in automotive applications.
  • the gas may be cooled from an inlet temperature of the second cooler device of around 700 °C to around 150 °C, with a thermal effectiveness of at least 80%.
  • the thermal effectiveness of the second cooler section is in the range 90% to 95%.
  • the exhaust gas re-circulation system may be fully integrated as a set of connecting pipes and cooler devices being of welded, brazed or soldered construction, without the need for being joined by fasteners, external clamps or other additional mechanical fixings.
  • FIG 9a there is illustrated schematically a second specific embodiment EGR system.
  • the second system for re-circulating exhaust gas from an internal combustion engine having an inlet manifold 901 and an outlet manifold 902, an inlet air compressor 903 and a turbo 904 operating of the exhaust gas and comprises a first EGR cooler 905, an inlet of which is supplied with exhaust gas from the exhaust manifold 902 of the internal combustion engine via an exhaust feed pipe 906, the first EGR cooler receiving high temperature exhaust gas at a temperature in the range 1000 °C - 1100 °C; and a second EGR cooler 907 which receives relatively lower temperature exhaust gas, typically at a maximum inlet temperature of around 650 °C, and which cools the gas down to a temperature around 150 °C.
  • the cooled exhaust gas being fed through the outlet of the second EGR cooler directly into the inlet manifold 901.
  • the second EGR cooler 907 is bypassed, but the first EGR-cooler 906 remains in the EGR circuit.
  • a temperature at the inlet of the first EGR cooler 906 may be of the order of 400 °C, and gradually rises as the engine warms up, towards a maximum temperature in the range 1000 °C - 1100 °C.
  • the second EGR cooler 907 can be bypassed, thereby enabling the engine to heat up to its optimum running temperature more quickly, improving efficiency of the engine.
  • the second EGR cooler 907 is switched into circuit via a valve mechanism to provide further cooling of the exhaust gas before it is fed back into the inlet manifold 901.
  • the third exhaust gas re-circulation cooling system is configured for cooling an engine 1000 having an inlet manifold 1001, ah outlet manifold 1002, optionally, a compressor 1003 for compressing air before entry to the inlet manifold 1001; and optionally a turbo 1004, which is driven from exhaust gases vented from the outlet manifold 1002.
  • the third EGR system comprises a higher temperature EGR cooler as herein before described; a relatively lower temperature EGR cooler 1006 as herein before described.
  • a first feed pipe 1007 for feeding exhaust gases from the outlet manifold 1002 to an inlet of the higher temperature EGR cooler 1005; a connecting pipe 1008 for connecting the outlet of the higher temperature EGR cooler to the inlet of the lower temperature EGR cooler 1006; and a return connecting pipe 1009 for connecting the outlet of the lower temperature EGR cooler to the inlet manifold 1001.
  • the relatively higher temperature EGR cooler accepts hot exhaust gases at a maximum temperature of up to 1100 °C and cools these down to a relatively lower temperature of around 700 °C at its outlet.
  • the higher temperature EGR cooler comprises a single gas passage type as described herein with reference to figures 4 to 7 herein before.
  • the relatively lower temperature EGR cooler 1006 is of the multiple internal gas passage type having multiple internal gas conduits secured to a pair of bulkheads within an outer canister as described with reference 2 and 3 herein before, and which typically operates at a maximum inlet gas temperature of up to 700 °C, cooling the gases down to an outlet temperature of approximately 150 °C before returning the cooled gases to the inlet manifold 1001 via the return CONDUIT 1009.
  • FIG 11 there is illustrated schematically a fourth exhaust gas re-circulation system according to a ninth specific embodiment herein.
  • the fourth EGR cooling system is suitable for fitting to an internal combustion engine having an inlet manifold 1101, an outlet manifold 1102, an optional compressor 1103 for compressing inlet gases prior input into the inlet manifold; and optional turbo 1104 operating off the exhaust gas from the exhaust manifold 1102.
  • the fourth exhaust gas re-circulation system comprises a high temperature EGR cooler 1105 receiving hot high pressure exhaust gases from the outlet manifold 1102 via a feed pipe 1106; a flow control valve 1107 receiving exhaust gases from the outlet of the high temperature EGR cooler 1105 and for controlling an overall flow rate of gas through the EGR system; a low temperature EGR cooler 1108 connected down stream of the flow control valve, and downstream of the high temperature EGR cooler, for applying further cooling to the exhaust gases; a bypass valve 1109 for directing exhaust gases straight past the low temperature cooler 1108, or alternatively routing gases through the low temperature EGR cooler, or for selecting a proportion of exhaust gases for routing through the low temperature EGR cooler 1108, as required by the engine temperature during start up of the engine, and a return pipe 1110, connected to the outlet of the bypass valve for receiving exhaust gases either bypassing the low temperature EGR cooler, or having been routed through the low temperature EGR cooler and returning those exhaust gases to the inlet manifold 1101 of the engine.
  • the fourth EGR system comprises a high pressure system, taking the exhaust gases directly from the outlet manifold, and returning them directly to the inlet manifold of the internal combustion engine 1100.
  • the high temperature EGR cooler is permanently connected, but the flow of gas through that cooler is regulated by the flow control valve 1107.
  • the high temperature EGR cooler can be used alone using bypass valve 1109 to bypass the lower temperature cooler 1108.
  • the low temperature EGR cooler 1108 can be brought into circuit using the bypass control valve 1109, which can be varied to allow different flow rates of exhaust gas through the low temperature EGR cooler 1108.
  • the temperature gradient between the inlet of the high temperature EGR cooler and the outlet of the low temperature EGR cooler is between 1100 °C maximum, and around 150 °C at the exhaust returned system.
  • the low temperature EGR cooler is brought into circuit using the bypass valve, so that when the circuit is fully operational and the engine is running at full temperature, the inlet of the high temperature EGR cooler is at a maximum temperature of 1100 °C, the outlet of the high temperature is at a maximum temperature of around 700 °C, the inlet of the low temperature EGR cooler is at a maximum temperature of around 700 °C and the outlet of the second EGR cooler is at a maximum temperature of around 150 °C.
  • the EGR control valve never has exhaust gas hotter than 700 °C passing through it.
  • FIG 12 there is illustrated a fifth EGR system according to a tenth specific embodiment herein.
  • the fifth EGR system is suitable for cooling re-circulated exhaust gases of an internal combustion engine 1200 having an inlet manifold 1201, an outlet manifold 1202, an optional compressor 1203, and an optional turbo 1204 as described with reference to figure 11 .
  • the fifth EGR system comprises a high temperature EGR cooler 1205 which is connected to an outlet of the outlet manifold 1202 by an outlet feed pipe 1206; a low temperature EGR cooler, an inlet of which is connected to an outlet of the high temperature EGR cooler 1205 via a bypass valve 1207; and a flow control valve 1208 positioned downstream of the bypass valve 1207 and low temperature EGR cooler 1206, the flow control valve being connected to the inlet manifold of the internal combustion engine by a return flow path 1209.
  • the flow control valve is provided downstream of both the high temperature and low temperature EGR coolers, which means that the bypass valve 1207 operates at a maximum temperature of around 700 °C, and the flow control valve operates at a maximum temperature of around 150 °C.
  • the temperature gradient extends from an inlet gas temperature at the inlet of the high temperature EGR cooler at around 1100 °C, which cools the gas to a maximum temperature of around 700 °C at the outlet of the high temperature EGR copier and at the bypass valve.
  • the low temperature EGR cooler when fully operational cools the gas from a maximum temperature of around 700 °C to a temperature of around 150 °C at its outlet, returning the exhaust gas to the inlet manifold via the flow control valve 1208 at a maximum temperature of around 150 °C.
  • the whole of the EGR system is under relatively high pressure, taking exhaust gas directly from the exhaust manifold and returning it to the inlet manifold 1201.
  • a higher gas inlet temperature cooler may feed partially cooled gas to a lower gas inlet temperature cooler as shown herein above.
  • a non-cooled gas transfer conduit may be positioned either before a relatively higher gas inlet temperature cooler, or between a higher gas inlet temperature cooler and a lower gas inlet temperature cooler, or after a lower gas inlet temperature cooler.
  • the non cooled gas transfer conduit may have corrugations, either helical or annular, in order to give it flexibility.
  • FIG 13 there is illustrated schematically in cut away view a pre-cooler device of an exhaust re-circulation system, according to a twelfth specific embodiment.
  • the pre-cooler device comprises an outer tubular conduit member 1300, the outer conduit surrounding an inner tubular conduit member 1301.
  • the inner conduit 1301 provides a gas passage between a first end 1302 and a second end 1303.
  • the outer conduit 1300 surrounds the inner conduit 1301, and the cavity between the inner and outer tubular conduit members forms a cavity, through which a coolant fluid may be passed.
  • Outer tubular member 1300 comprises a corrugated portion 1304, capable of absorbing vibration and thermal expansion/contraction in an axial direction and in direction transverse to axial as the component heats up or cools down.
  • the inner tubular -member comprises a corrugated portion 1305, also capable of absorbing vibration and thermal expansion and contraction as the component heats and cools.
  • the inner tubular member is corrugated for its entire length, and preferably is deeply corrugated mainly on the bend, whereas the outer tubular member 1300 has first and second regions 1306, 1307 which are smooth and cylindrical, and toroidol respectively.
  • the inner tubular member and the outer tubular member are connected only at their respective first and second ends. For the remaining lengths of the first and second outer tubular members, those members do not touch each other, the inner tubular member being suspended within the outer tubular member along substantially all of the length of the outer tubular member.
  • the inner tubular member comprises a first region 1308, in which the corrugated wall is indented with first and second relatively deep elongate indents.
  • a first end 1303 is shown in more detail in Figure 17 .
  • a second (outlet) end of the device comprises a tubular outer end connector 1309 which connects then respective first ends of the inner and outer tubular members together such that the first and second ends of the tubular members do not touch each other.
  • the end connector 1309 comprises a swaged tube 1310, having a substantially cylindrical inner surface 1311 in to which an outer cylindrical end surface of the inner tubular member locates, for example by a force fit or-an interference fit, and which can be secured in addition by welding or brazing; and a substantially cylindrical second inner surface 1312 which locates with a substantially cylindrical outer surface of a first end of the outer tubular member.
  • the end member 1309 comprises a flange 1313 having one or a plurality of apertures 1314, by means of which the component may be bolted to the second stage of the EGR system.
  • the outer tubular member may be formed as a single piece, or alternatively may be constructed from one or more members assembled together.
  • the outer tubular member may comprise a first piece 1315 comprising a tubular cylindrical wall having a frusto conical end shaped for fitment in to the end piece 1309.
  • the second outer tubular member piece 1316 may comprise a series of annular corrugations disposed between first and second substantially cylindrical tubular portions.
  • the third outer tubular member piece 1317 may comprise a tubular torodiol or angled component having an extended substantially cylindrical piece on the end. The three components may be connected together by push-fit, interference fit and/or by welding or brazing.
  • the other tubular member may be formed as a single metal tube component for example by hydraulic forming.
  • the inner tubular member 1301 of the pre-cooler device of figure 13 is illustrated schematically in perspective view, the inner tubular member 1301 of the pre-cooler device of figure 13 .
  • the inner tubular member is formed from a single piece of metal, for example by formation under hydraulic pressure.
  • the inner tubular member comprises a relatively longer substantially straight substantially cylindrical region 1401 forming an outlet of the member; a substantially curved torodiol, or doughnut shaped portion 1402, and a second relatively shorter substantially straight substantially cylindrical portion 1403 which is at an inlet end of the member.
  • the first substantially straight substantially cylindrical portion 1401 comprises a pair of opposing indents 1404, 1405 which protrude in to the otherwise substantially cylindrical corrugated passage through the first tubular member, and extending longitudinally along a length of the first portion 1401, so that in cross section in a direction transverse to the main length of the passage, the internal passageway has a substantially butterfly, double mushroom, batwing shaped or double cardioid cross section.
  • the first substantially cylindrical section comprises as first series of corrugations 1406 of a first type, and a second set of corrugations 1407 of a second type.
  • the second, partially substantially torodial section 1402 comprises a plurality of annular corrugations of a second type
  • the third substantially straight cylindrical section 1403 comprises a plurality of indentations of the first type.
  • FIG 15 there is illustrated schematically in cross-sectional view along a main length axis of the first section of the first inner tubular member, across the section A-A, showing the substantially butterfly, batwing, double mushroom or double cardioid shaped of the internal gas passage.
  • the wall of the inner tubular member comprises a substantially circular profile having first and second laterally opposing indents 1500, 1501, each indent extending from a position on a nominal outer circle, towards the center of the circular profile a distance of 60% - 90% of the radius of the circle (corresponding to 30% to 45% of the distance across the inner tubular member), and in the best mode, approximately 77% of the radial distance, but may be as much-as 15% to 90% of the radial distance across the inner tubular member.
  • each indent occupies and arc of angle in the range 30° - 50°.
  • Each indent, in cross-sectional profile comprises a substantially "V" shape, having a rounded point at the inter-section of two substantially straight side walls.
  • FIG 16 there is illustrated schematically in cross-sectional view one side wall portion of the tubular member at a position A-A as shown in figure 15 .
  • the side wall portion comprises a plurality of corrugations of the first type.
  • pitch between peaks of the corrugations is 6mm or thereabouts, corresponding to a peak to peak spacing of around 16% to 20% of the distance across the tubular member.
  • the corrugations are substantially triangular or sinusoidal in profile, and have an amplitude in the range of 10% - 20% of the peak to peak distance between corrugations, and in the best mode of the order of 16%.
  • the corrugations have a peak to trough distance in the radial direction of the order of 6% to 8% of the internal radial distance of the inner tubular member.
  • a pitch between peaks of the corrugations may be of the order of 6mm.
  • the radius of the inner tubular member is of the order of 16.5mm.
  • FIG 17 there is illustrated schematically in partial cut away view the first end of the pre-cooler component of figures 13 to 16 .
  • the first type of corrugation as described herein with reference to figures 13-16 comprises a relatively lower peak to trough variation in radius
  • the second type of corrugation comprises a relatively greater peak to trough radial variation.
  • the second type of corrugations comprises a variation in wall shape substantially in the form of a toroidal ring protruding out of the wall, successive rings being spaced apart from each other by a plurality of substantially cylindrical trough regions 1702 (in the case of a region of the inner tubular member which is substantially cylindrical).
  • the peak to peak pitch between successive second rings is of the order of 6mm, and is approximately the same as the successive peak to peak distance between annular corrugations 1700 of the first type.
  • a peak to trough distance of the second corrugation type may be in of the order of 10% to 14% of a maximum radius of the inner tubular member, or 5% to 7% of the distance across the inner tubular member.
  • a tubular end piece member 1703 in to which the inner tubular member and the outer tubular member each fit.
  • the end piece 1704 comprises a cast or otherwise formed tubular metal component having a first locating inner surface 1705 for locating an end 1706 of the inner tubular member; and a second cylindrical inner surface 1707 to which fits an outer surface of the outer tubular member.
  • the first substantially cylindrical inner surface 1705 is spaced apart laterally from the second annular inner surface 1707 in a direction along a main length axis of the component, such that the inner and outer tubular members can both be inserted in to the tubular end component and are retained by friction (a force fit or an interference fit) plus welding or brazing between the inner tubular member and the end component and the outer tubular member component.
  • the end component comprises a circular passageway 1708, through which coolant fluid may flow in to or out of the cavity 1709 formed between the outer tube member arid the inner tubular member.
  • the pre-cooler device of figures 13 to 17 may provide an efficient precooling temperature drop with an inlet temperature of 1100°C down-to around a temperature of around 700°C at the outlet of the pre-cooler.
  • corrugations have been shown for the inner and outer tubular members of the pre-cooler device, the corrugations could be made helical as an alternative embodiment.
  • the corrugations extend in either case around a circumference of the inner tubular member, and similarly for the outer tubular member.
  • a high gas inlet temperature cooler as described herein may be designed to function with relatively high inlet gas temperatures (up to 1100 °C) and be able to withstand the associated thermal shock loading by using a single gas tube to form the gas conduit.
  • the gas conduit may be substantially concentric within an outer cooler conduit, and an annular space between said gas tube and said outer cool tube may form a cavity for a coolant fluid.
  • the cooler may avoid having any bulkhead interfacing between the gas conduit and any other component within the cooler.
  • a high gas inlet temperature cooler may be used to cool an EGR valve, thus enabling the EGR valve to be located after the high gas inlet temperature cooler and therefore upstream of a relatively lower temperature gas cooler, operating typically at a maximum temperature of around 700°C.
  • the relatively higher gas inlet temperature cooler may be used to cool an exhaust gas re-circulation valve, which enables a lower temperature cooler to be located after the EGR valve.
  • a relatively high gas inlet temperature cooler may have at least two bends along its main axis.
  • the relatively high gas inlet temperature cooler may have a gas inlet interface joint between a gas conduit and the rest of the cooler, which is substantially cooled by the cooler coolant.
  • the EGR system may be used for "high pressure" exhaust gas re-circulation, ie taking gas from pre turbo in the gas flow through an internal combustion engine.
  • the EGR system may also be used for "low pressure" exhaust gas re-circulation, i.e. taking exhaust gases after passing through a turbo.
  • the lower gas inlet temperature cooler may have a bypass valve such that gas can bypass the cooler without being significantly cooled.
  • the whole of the EGR system may not be bypassed as this would cause the gas inlet to the induction side to be too hot.
  • the lower gas inlet temperature cooler may have one or a plurality of internal gas conduits, all of which are flexible along their axis and have either annular or helical corrugations along their walls.
  • the corrugations may be present substantially all the way along the internal gas conduits, or in a restricted section of the gas conduits.
  • An outer casing of the lower temperature gas cooler may have annular or helical corrugations to allow flexibility along the length of the casing.
  • the corrugations may be present along substantially the entire outer cooler conduit, or may be restricted to a section of its length.
  • the embodiments disclosed above may provide an EGR system capable of cooling re-circutated exhaust gas from a maximum temperature of around 1100 °C at a gas inlet to the system, down to a first stage of cooling at a maximum temperature of around 700 °C within a specially designed section which is robust against thermal shock, thermal loading and thermal growth.
  • the gas may then be further cooled down from a maximum temperature of around 700 °C within a second cooling section which has a thermal effectiveness of at least 90%, and preferably at least 95%.
  • the whole system may be fully integrated, without the use of additional fasteners or connectors between the tubes and sections, to form a unitary welded, brazed or soldered construction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (16)

  1. Abgaskühlvorrichtung, umfassend:
    ein inneres Rohrelement (1301) mit einem Eintrittsende und einem Austrittsende, wobei das innere Rohrelement einen Gasdurchgang bildet; und
    ein äußeres Rohrelement (1300), welches einen äußeren Abschnitt des inneren Rohrelements umgibt und einen Hohlraum dazwischen bildet, um ein flüssiges Kühlmittel aufzunehmen,
    wobei das innere Rohrelement eine Vielzahl von Wellen (1305) zum Absorbieren der thermischen Expansion und/oder der Kontraktion des inneren Elements umfasst; und
    wobei das äußere Rohrelement eine Vielzahl von Wellen (1304) zum Absorbieren der thermischen Expansion und/oder Kontraktion des äußeren Elements umfasst;
    dadurch gekennzeichnet, dass das innere Rohrelement mindestens eine längliche Einbuchtung (1404, 1405, 1500, 1501) umfasst, die über eine erweiterte Länge des inneren Rohrelements in den Gasdurchgang hineinragt.
  2. Kühlvorrichtung nach Anspruch 1, wobei die mindestens eine Einbuchtung auf einem im Wesentlichen geraden Abschnitt des inneren Rohrelements positioniert ist.
  3. Kühlvorrichtung nach Anspruch 1 oder 2, wobei eine Wand des inneren Rohrelements, betrachtet im Querschnitt über eine Hauptachse des inneren Rohrelements, ein im Wesentlichen kreisförmiges Profil mit ersten und zweiten, sich seitlich gegenüberliegenden Einbuchtungen (1404, 1405, 1500, 1501) umfasst, wobei sich jede Einbuchtung von einer Position auf einem nominellen äußeren Kreis aus einwärts in Richtung einer Mitte des inneren Rohrelements erstreckt.
  4. Kühlvorrichtung nach Anspruch 3, wobei sich jede Einbuchtung von einer Position auf dem nominellen äußeren Kreis mit einem Abstand im Bereich von 60 % bis 90 % eines Radius des Kreises in Richtung der Mitte des Kreises erstreckt.
  5. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei jede Einbuchtung einen Bogenwinkel im Bereich von 30° bis 50° beansprucht.
  6. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei jede dieser Einbuchtungen im Querschnittprofil im Wesentlichen eine "V"-Form mit einem gerundeten Punkt an einem Schnittpunkt von zwei im Wesentlichen geraden Seitenwänden umfasst, die das innere Rohrelement umfassen.
  7. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, umfassend erste und zweite der Einbuchtungen, die entlang des inneren Rohrelements über eine erweiterte Länge des inneren Rohrelements in einen Gasdurchgang hinein bereitgestellt sind, um so eine relativ erhöhte Oberfläche in Kontakt mit dem Gasfluss durch das innere Rohrelement bereitzustellen, verglichen mit einem im Wesentlichen zylindrischen Wellenabschnitt des inneren Rohrelements.
  8. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei die inneren und äußeren Rohrelemente so angeordnet sind, dass sie außer an den ersten Enden der inneren und äußeren Rohrelemente und den zweiten Enden der inneren und äußeren Rohrelemente nicht in Kontakt miteinander sind.
  9. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei die Wellen an dem inneren Rohrelement sich über eine Länge zwischen 10 % und 85 % einer Gesamtlänge des inneren Rohrelements erstrecken.
  10. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei das äußere Rohrelement eine Gruppierung von Wellen aufweist, die sich über einen Anteil zwischen 10 % und 100 % der Länge des äußeren Rohrelements erstreckt.
  11. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei das innere Rohrelement umfasst:
    einen ersten Typ von Ringwellen mit einem Spitzezu-Spitze-Abstand zwischen benachbarten Wellen in einer Richtung entlang der Hauptlänge des inneren Rohrelements in einem Abstand, der 16 % bis 20 % des Abstands über das innere Rohrelement entspricht.
  12. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, umfassend einen ersten Typ von Wellen mit einem Spitze-zu-Tal-Abstand im Bereich von 6 % bis 8 % des inneren radialen Abstands des inneren Rohrelements.
  13. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, umfassend Wellen eines zweiten Typs mit einem Spitze-zu-Tal-Abstand im Bereich von 10 % bis 14 % eines Maximalradius des inneren Rohrelements.
  14. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, umfassend mindestens eine längliche Einbuchtung, die sich entlang einer Hauptaxiallänge des inneren Rohrelements erstreckt;
    wobei die Einbuchtung einen Wandabschnitt umfasst, der sich in einen inneren Hauptdurchgang des inneren Rohrelements hinein bis zu einem Abstand im Bereich von 15 % bis 90 % eines Abstands über das innere Rohrelement erstreckt.
  15. Kühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei jede längliche Einbuchtung mit einer Vielzahl von Wellen überlagert ist, die sich im Umkreis um das innere Rohrelement erstrecken.
  16. Abgaskühlvorrichtung nach einem der vorhergehenden Ansprüche, wobei die erste Kühlvorrichtung das Abgas von einer maximalen Eintrittstemperatur von 1100 °C bis auf eine maximale Austrittstemperatur von 700 °C abkühlen kann.
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GB0715891A GB2451862A (en) 2007-08-15 2007-08-15 High gas inlet temperature EGR system
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Also Published As

Publication number Publication date
EP2215346B1 (de) 2012-11-21
GB0715891D0 (en) 2007-09-26
EP2570646A1 (de) 2013-03-20
EP2215346A1 (de) 2010-08-11
GB2451862A (en) 2009-02-18
WO2009022113A1 (en) 2009-02-19

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