Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • 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
  • 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
  • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
• • 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
  • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
• • 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
  • F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
• • 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
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
  • F28F2250/06—Derivation channels, e.g. bypass
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/04—Fastening; Joining by brazing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/06—Fastening; Joining by welding
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts

Definitions

• the invention relates to a device for exhaust system in an internal combustion engine having a heat exchanger with an inner housing and an outer housing, a bypass valve, a mixing housing in which the bypass valve is mounted and which is fixed to the heat exchanger, a first valve seat which is formed on the mixing housing and on which rests the bypass flap in the bypass-closing state and a second valve seat on which rests the bypass flap in the heat exchanger closing state.
• Such devices for exhaust system are mainly used in the field of exhaust gas recirculation in internal combustion engines in motor vehicles.
• the exhaust gas produced during the combustion process is fed back to the combustion process via an exhaust gas recirculation line for the purpose of reducing pollutant emissions.
• a further reduction, in particular of the resulting nitrogen oxides, is achieved by the cooling of the exhaust gas and the associated reduction in the combustion temperature, which is why exhaust gas coolers are used.
• this effect is thwarted during the warm-up phase of the internal combustion engine, as the catalyst is prevented from starting up due to the low temperatures, whereby hydrocarbons and carbon monoxides are no longer removed.
• exhaust gas coolers can be bypassed in modern internal combustion engines, at least during the warm-up phase via a bypass, whereby the heating time is significantly reduced.
• Various devices and in particular assemblies with coolers, bypass flaps and exhaust gas recirculation valves have become known. Frequently, there is the problem that with little space due to the necessary deflections of the exhaust gas flow, an increased pressure loss occurs, which in turn leads to a reduced purge gradient and thus reduced exhaust gas recirculation rates.
• DE 10 2006 035 423 A1 discloses an exhaust gas recirculation device in which a bypass flap arranged in a mixing housing and in front of an exhaust gas cooler has two end positions, of which a substantially straight inflow into a heat exchanger can take place in the first end position.
• the exhaust gas When bypassing the heat exchanger, the exhaust gas must be deflected by about 90 °.
• the bypass flap is flowed in its other end position at an angle of about 45 °. At approximately the same angle, the exhaust gas continues to flow from the flap surface, so that a gentle deflection with significantly reduced pressure loss follows.
• an obliquely cut off pipe socket is attached by means of press fit in the mixing housing, the inclined surface forms the second valve seat.
• This assembly is complicated and requires mechanical processing of the mixing housing, so that there is an increased manufacturing and assembly costs for providing this valve seat.
• a device for exhaust system in an internal combustion engine having the features of the main claim. Characterized in that a collar is formed on the inner housing of the heat exchanger, which forms the second valve seat, the valve seat is mounted by fixing the heat exchanger housing to the mixing housing simultaneously. This eliminates processing steps of the mixing housing.
• the inner housing has a flange plate on which the collar is formed. This flange plate forms a straight surface, which can be used for dimensionally accurate fixation of the collar, so that the valve seat is aligned correctly with the bypass flap. So that the number of components can be kept as low as possible, the flange plate simultaneously limits a coolant channel between the inner housing and the outer housing axially.
• the mixing housing is attached with the interposition of the flange plate on the outer housing of the heat exchanger, so that a positioning of all three housing parts to each other takes place in a fastening step.
• the heat exchanger is a shell and tube heat exchanger, the tubes of which are secured to openings of the flange plate shaped corresponding to the tubes, the collar being secured to the opposite side of the flange plate and projecting into the mixing housing.
• the collar can also be soldered during the soldering of the tubes to the heat exchanger, so that no additional attachment step is required.
• the bypass flap is mounted eccentrically on a shaft mounted in the mixing housing and rests in the closed state in each case circumferentially on the respective valve seat, since in this way a high tightness is achieved in the closed state.
• a particularly compact arrangement with very small axial space results when the heat exchanger U-shaped ig flow through and the flange plate forms the inlet and the outlet of the heat exchanger, wherein inlet and outlet are arranged on opposite sides of the bearing of the shaft of the bypass valve.
• openings are formed on the mixing housing, protrude into the positioning, which are arranged on the heat exchanger. This correct alignment of the valve seat to the valve body ensures a high tightness in the closed state of the flap.
• the screws by means of which the flange plate is fastened to the outer housing of the heat exchanger, serve as positioning elements, so that additional elements for alignment can be dispensed with, so that an exact fit is achieved without further assembly steps.
• the mixing housing is aligned by means of dowel pins to the heat exchanger.
• a wall which is formed on the side facing away from the outlet of the heat exchanger side of the collar has a greater extent than a wall which is formed on the side facing the outlet of the heat exchanger, so that the adjusting angle of the valve is reduced.
• there is a gentle deflection of the gas flow so that resulting pressure losses due to vortex formation abrupt vertical deflection are largely avoided.
• a further reduction of the occurring pressure loss is achieved if an exhaust gas recirculation valve is arranged in the mixing housing upstream of the bypass valve whose outlet is arranged opposite to the inlet of the heat exchanger, since in this way a flow direction change when flowing into the mixing housing is initially avoided.
• Figure 1 shows a partially sectioned view of a section of the device according to the invention in a perspective view.
• Figure 2 shows a side view of a section of the device according to the invention immediately prior to assembly in a perspective view.
• the device according to the invention shown in the figures for exhaust system consists of a mixing housing 10, to which a Heat exchanger 12 is attached.
• the mixing housing 10 has an opening 14, in which a designed as a plug valve exhaust gas recirculation valve 16 is inserted, which is fastened by means of screws 18 to a flange 20 which surrounds the opening 14.
• the exhaust gas recirculation valve 16 has a flow housing 22 with an inlet 24 and an outlet 26, each opening into the mixing housing 10. Between inlet 24 and outlet 26 there is a valve body which can not be recognized in the drawings, by means of which a flow cross-section from inlet 24 to outlet 26 can be regulated in accordance with the activation of an actuator 28.
• the heat exchanger 12 is in the present embodiment, a flat tube bundle heat exchanger having an outer housing 34 which defines a coolant jacket radially outward and in which the flat tubes of the heat exchanger 12 extend.
• These flat tubes are each soldered to correspondingly shaped openings 36 in a flange plate 38 and have a U-shape, so that both ends of the flat tubes in the openings 36 of the same flange plate 38 open.
• the flat tubes with the flange plate 38 form an inner housing 39 of the heat exchanger 12.
• the openings 36 of this flange 38 form not only the inlet 30 but also the outlet 40 into which the second ends of the flat tubes open.
• This outlet 40 opens into an outlet space 42 in the mixing housing 10 which has an outlet opening 44, via which the exhaust gas can leave the mixing housing 10.
• the flange plate 38 is fixed to a flange 46 on the outer housing 34, this can be done either by soldering or welding or in the present embodiment by screws 48.
• the mixing housing 10 is also connected via a formed on the mixing housing 10 flange 50 but via another hole pattern with the flange plate 38 and the outer housing 34 with the interposition of a seal 52 by means not shown screws.
• a lo Vorpositiontechnik of the mixing housing 10 to the flange 38 is made by the heads of the screws 48, which serve for the mounting of the flange 38 on the outer housing 34 are used as dowel pins by these project into corresponding openings 54 on the flange 50 of the mixing housing 10.
• bypass flap 56 is eccentrically mounted in the mixing housing 10 via a shaft 58.
• a circumferential first valve seat 60 is correspondingly formed on the mixing housing 10 between the inlet space 32 and the outlet space 42, on which the bypass flap 56 rests circumferentially in the position closing the bypass passage.
• a second valve seat 62 is formed by a collar 64, which is fastened to the flange plate 38 of the heat exchanger 12 at the opposite side to the first flat tube ends, in particular by soldering, and thus protrudes into the inlet space 32 of the mixing housing 10.
• the above positioning is important to a dense
• the collar 64 unlike the bypass flap 56, is not fastened directly but only indirectly via the flange plate 38 to the mixing housing 10, the closure can be reached on the collar 64 when the bypass flap 56 rests on it.
• the mounting of the collar 64 is very simple.
• These two opposed walls 66, 68 are at their ends by correspondingly sloping walls 70 connected.
• the walls 66, 68, 70 of the collar 64 enclose all openings 36 of the flange plate 38 which serve as an inlet 30.
• the walls 70 enclose an angle of approximately 35 °, so that the bypass flap 56 only has an adjustment range of approximately 55 ° , So that the bypass flap 56 can rest completely on the second valve seat 62 with its edge region, the shaft 58 is mounted approximately in the height of the wall 68 facing the outlet 40 and parallel to it in the mixing housing 10. In this case, the shaft 58 directly adjoins the wall 68 in the mounted state.
• the first valve seat 60 is disposed at the level of the shaft 58.
• One end of the shaft 58 protrudes from the mixing housing 10 to the outside.
• an eccentric 72 is arranged, which is connectable in a known manner with an actuator, not shown.
• the bypass valve 56 is in the bypass passage occluding state, corresponding to the inlet space 32 separates from the outlet space 42 of the mixing housing 10 by resting on the first valve seat 60 surrounding.
• exhaust gas from the exhaust gas recirculation valve 16 flows without being deflected straight through the intake space 32 via the bypass door 56 to the inlet 30 of the heat exchanger 12 immediately opposite to the outlet 26 of FIG
• Exhaust gas recirculation valve 16 is arranged. From here, the exhaust gas flows through the flat tubes of the heat exchanger 12 and is cooled by the flowing between the flat tubes in the coolant jacket coolant. It flows in a U-shape through the heat exchanger 12 and passes through the 5 openings 36 at the outlet 40 into the outlet space 42 of the mixing housing 10. Via the outlet opening 44, the exhaust gas leaves the mixing housing and can be re-supplied to the cylinders of the internal combustion engine.
• the bypass flap 56 is located on the second valve seat 62 formed on the collar 64.
• the exhaust gas originating from the outlet 26 of the exhaust gas recirculation valve 16 flows in the inlet space 32 in the direction 5 of the bypass flap 56.
• the exhaust is smoothly deflected and passes through the first valve seat 60 from the inlet space 32, bypassing the heat exchanger 12 directly into the outlet space 42 and thus to the outlet port 44.
• a vortex formation, which would lead to an increased pressure loss is avoided as much as possible.
• the second valve seat 62 can be aligned by means of the collar 64 with little effort and without necessary mechanical processing des5 mixing housing 10 via the flange plate 38 to the bypass valve 56, wherein pressure losses are reduced in the exhaust system.

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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)
• Exhaust-Gas Circulating Devices (AREA)
• Exhaust Silencers (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=48289149

Family Applications (1)

Country Status (5)

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Citations (3)

• 2012
  • 2012-05-25 DE DE102012104545.3A patent/DE102012104545B4/de not_active Withdrawn - After Issue
• 2013
  • 2013-04-30 IN IN7334DEN2014 patent/IN2014DN07334A/en unknown
  • 2013-04-30 ES ES13720363.4T patent/ES2572708T3/es active Active
  • 2013-04-30 EP EP13720363.4A patent/EP2855909B1/de active Active
  • 2013-04-30 WO PCT/EP2013/059027 patent/WO2013174629A1/de active Application Filing

Patent Citations (3)

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