Classifications

• • 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
  • 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
  • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• • 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
  • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
• • 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
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
  • F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters

Definitions

• the present invention generally relates, at a first point, to a gas-filter unit unit with a particulate filter, in particular for the exhaust gases of an engine, and more particularly to an assembly where the junction of the particulate filter with the gas piping unit is such as to ensure sealing.
• a second aspect of the invention relates to a method of manufacturing the entire first point.
• the present invention relates to a gas heat exchanger which comprises the entire first point.
• the invention is particularly applicable in the exhaust gas recirculation exchangers of an engine ("Exhaust Gas Recirculation Coolers" or EGRC).
• the main function of the EGR exchangers is the heat exchange between the exhaust gas and the coolant, in order to cool the gases.
• EGR heat exchangers are widely used for diesel applications to reduce emissions and also serve in gasoline applications to reduce fuel consumption.
• EGR heat exchangers there are two types: a first type consists of a housing inside which there is a bundle of parallel tubes for the passage of gases, the refrigerant circulating in the housing, outside the tubes, and the second type consists of a series of parallel plates which constitute the heat exchange surfaces, so that the exhaust gases and the refrigerant circulate between two plates, in alternating layers, with the possibility of including fins to improve the heat exchange.
• the assembly between the tubes and the housing can be of different types.
• the tubes are fixed at their ends between two support plates connected to each end of the housing, the two support plates having a plurality of orifices for the installation of the respective tubes.
• connection means with the recirculation circuit which may consist of a V-shaped connection or of a peripheral connecting flange or a flange, depending on the design of the recirculation circuit in the recirculation circuit. which is connected the exchanger.
• the peripheral collar can be assembled with a gas tank, so that the gas tank is an intermediate piece between the housing and the collar, or the collar can be assembled directly to the housing.
• LP low pressure
• Said filter is generally constituted by an independent component or, in some cases, by a component integrated with the RGE exchanger.
• the following patent documents propose heat exchangers with particle filters attached or integrated in different parts of the heat exchanger.
• the patent EP2273095B1 relates to a heat exchanger comprising a fluid filter integrated in said exchanger, which comprises a filter zone protruding from a flat surface. This filter is configured as a gasket and is mounted between the connection flange and the gas tank by means of hardware.
• EP2194351 B1 relates to a heat exchanger comprising a particulate filter for filtering exhaust gas, structurally integrated inside the gas inlet tube of the heat exchanger.
• the patent FR2938051 B1 relates to a heat exchanger which comprises a filter housed in a selected position so that the filter is disposed near an extreme side of the tubular bundle.
• the patent ES2421 185B1 describes a heat exchanger which comprises a gas reservoir provided with an inlet port connectable to one end of the housing and an outlet connected to the line recirculating gas and a particulate filter assembled at the inlet port of the gas tank, preferably by arc or spot welding and, in addition, optionally by brazing.
• Thermal exchangers which comprise a gas tank and a collar or a connecting flange, integrated to form a single piece, so that the end of the gas tank can be coupled to the gas outlet of the housing, as well as a particle filter internally coupled to the connecting collar or, as proposed in the Spanish application with the publication number 2531 124, also from the same holder as the present application, directly to the gas tank.
• said Spanish application 2531 124 proposes a heat exchanger with a particle filter for filtering the exhaust gases associated with the outlet orifice of the gas reservoir and a seal disposed on an outer surface of the collar or the connecting flange, in which the filter is assembled by brazing between the gas tank and the collar or the connection flange, said filter thus being integrated into the gas tank forming a single piece which can be dismounted and can be coupled to the housing of the exchanger.
• the particle filter assemblies with the connection flange or with the gas reservoir proposed in said antecedents, carried out by electrical welding and / or brazing, do not succeed in guaranteeing a sealing around the whole assembly since they run on the risk of deforming the peripheral frame of the filter on which the welding is carried out, whereby with them there is a risk that unwelded material enters the engine circuit.
• the present invention relates, at a first point, to a gas filter unit unit with particulate filter, for a gas heat exchanger, especially for the exhaust gases of an engine, in which, so known per se, the gas pipe unit is adapted to be attached to the end of a heat exchanger block so that it remains in fluid communication with it for the gases to pass through and the filter is attached to the gas pipeline unit to filter the exhaust gases therethrough.
• the particulate filter is attached to the gas conduit unit by means of a fully sealed assembly made by welding laser, thus ensuring a sealing all along the assembly or weld bead against the passage of even particles of a size of a few microns.
• the gas conduit unit comprises a gas reservoir with a first portion including a first opening, connectable to an end of said heat exchanger block, and a second portion, including a second opening, be connected to a gas recirculation line, generally through a connection opening, the particulate filter being attached to said gas reservoir.
• the particle filter of the assembly proposed by the first aspect of the invention comprises a peripheral frame having a first face in contact with a peripheral zone of the second part of the surrounding gas reservoir.
• said peripheral frame being joined to said peripheral area by means of a continuous weld seam which delimits a closed circuit, which is produced by laser welding and which completely traverses the thickness of the peripheral frame and partially penetrates, controlled manner, in said second part of the gas tank.
• the gas conduit unit includes a connection flange connectable at a first end to a gas recirculation line and attached, at a second end opposite to said first end, to a reservoir. of the gas pipeline unit or integrated therewith, the particulate filter being attached to said connecting flange and arranged to filter the gases therethrough and pass through a through opening of the flange of connection.
• the particle filter of the assembly proposed by the first aspect of the invention comprises a peripheral frame having a first face in contact with a peripheral surface of said connecting flange surrounding said through aperture, said peripheral frame being joined to said peripheral surface by means of a continuous weld seam which delimits a closed circuit, which is produced by laser welding, which completely traverses the thickness of the peripheral frame and which partially penetrates, controlled way in the connection flange.
• the assembly proposed by the first aspect of the invention comprises, as variants of any of the alternative embodiments described above, a reinforcing ring fixed to the second face of said peripheral frame opposite said first face to the average of the aforementioned continuous weld seam.
• said reinforcing ring is made of metal, preferably of stainless steel, and said peripheral frame is made of metal or of thermoplastic material.
• One of the advantages of using the reinforcement ring is that it allows to weld a filter whose peripheral frame is not perfectly concentric with the opening around which it must be welded (whether of connecting flange or gas tank).
• the particulate filter is configured to block the passage of larger particles than the soot particles.
• a second aspect of the present invention relates to a method of manufacturing a gas filter unit unit with particle filter, for gas heat exchanger, especially for the exhaust of an engine, the driving unit. of gas being adapted to attach to one end of a heat exchanger block so that it remains in fluid communication therewith for the gases to pass therethrough, wherein the method comprises the operation of securing immovable the particulate filter at the gas line unit to filter the exhaust gases passing through it.
• the one proposed by the second aspect of the present invention comprises performing the attachment of the particle filter to the laser welding gas pipe unit, which provides a completely watertight assembly. passage of even particles of a size of a few microns.
• a third aspect of the present invention relates to a gas heat exchanger, in particular for the exhaust gases of an engine, which comprises:
• FIG. 1 is an exploded perspective view of the assembly proposed by the first aspect of the invention, for one embodiment in which the particle filter is arranged to attach to an integrated connection flange. to a gas tank;
• FIG. 2 is a perspective view of part of the assembly illustrated in FIG.
• Figure 3 shows a view similar to that of Figure 2 but where the particle filter is also shown in section along the above-mentioned transverse plane, and an enlargement of a detail of said view
• Figure 4 shows views similar to those of Figure 3, but for another embodiment slightly different from that of Figure 3, since the particle filter frame does not include a peripheral flange
• Figure 5 shows views similar to those of Figure 3, for the same embodiment, but once the filter has been attached to the laser welding connection flange
• Figure 6 shows an elevation and enlargement of a detail thereof, which correspond to those of Figure 5, for the same embodiment
• Figure 7 shows a perspective view of the assembly proposed by the first aspect of the invention, for one embodiment in which the particulate filter is arranged to attach to a gas reservoir, as well as an enlargement of a detail of this view; for the sake of clarity only a part of the gas reservoir resulting from a
• the assembly proposed by the first aspect of the present invention which comprises a gas conduit unit 2 and a particle filter 3, wherein the driving unit of gas 2 is adapted to be attached to one end of a heat exchanger block (not shown) so that it remains in fluid communication therewith for the gases to pass through and the particulate filter 3 is attached to the gas pipe unit 2 by a completely sealed assembly made by laser welding.
• the particle filter 3 comprises a central portion 3b or concave configuration screen as a tray and a wing or peripheral frame 3a by which to fix the filter 3 to the driving unit of gas 2.
• the gas pipe unit 2 comprises a connecting flange 4 connectable at a first end to a gas recirculation line and integrated with a gas tank 5 of the gas pipe unit, forming a single piece, the particle filter 3 being attached to said connecting flange 4 through the peripheral frame 3a and arranged to filter the gases that pass through and pass through an opening 4 of the connecting flange 4.
• the gas reservoir 5 comprises a first portion 5a, which comprises a first opening 01, connectable to one end of a heat exchanger block (not shown) and a second part 5b, which comprises a second opening 02 which can be connected to a gas recirculation line.
• the connecting flange 4 and the gas tank 5 are two independent parts attached to one another.
• Figures 1, 2, 3 and 4 show a situation prior to the welding of the filter 3 to the connection flange 4, while in Figures 5 and 6 the filter 3 has already been welded to the connection flange 4.
• the peripheral frame 3a of the filter 3 has a first face (bottom face according to the illustrated position) in contact with a peripheral surface 4b the connecting flange 4 which surrounds the through opening 4a, defining a contact plane P1 (see FIG. 6), and which, in the embodiment shown, constitutes the lap of a step defined in the outer face of FIG. the connection flange 4.
• the peripheral frame 3a is thus assembled to the peripheral surface 4r by means of a continuous weld seam C delimiting a closed circuit, which is produced by the laser welding, which completely traverses the thickness of the peripheral frame 3a and which penetrates partially in a controlled manner in the peripheral surface 4b of the connecting flange 4, as seen in Figures 5 and 6, in particular in the enlargements of details thereof.
• the assembly proposed by the first aspect of the invention comprises a reinforcing ring 7 (see FIGS.
• FIG. 1 to 6 attached to a second face of the peripheral frame 3a, opposite to the first face, to the means of said continuous weld seam C, which traverses the entire thickness of the reinforcing ring 7, as is seen in Figures 5 and 6, in particular in their corresponding detail enlargements.
• Figure 4 shows a variant slightly different from that illustrated in Figures 1, 2, 3, 5 and 6, since on these, unlike Figure 4, the peripheral frame 3a comprises an annular flange R which extends from the peripheral frame 3a in the direction illustrated, such that the reinforcing ring 7 has a width smaller than that of the ring of FIG. 4 and one of its edges abuts against said annular flange R and preferably nestle there.
• Figures 7 and 8 show another embodiment in which the filter 3 is attached to a gas reservoir 5 of the gas pipe unit 2, which has a first portion 5a, which comprises a first opening 01 , connectable to one end of a heat exchanger block (not shown) and a second portion 5b, which includes a second opening 02, connectable to a gas recirculation line, the particle filter 3 being attached to the reservoir of gas 5 through the peripheral frame 3a.
• the peripheral frame 3a has a first face (bottom face according to the illustrated position) in contact with a peripheral zone of the second part 5b of the gas reservoir 5 which surrounds the second opening O2, the frame 3a device being assembled to said peripheral zone by means of a continuous weld seam C (not shown in this example) which delimits a closed circuit, which is produced by laser welding and which completely traverses the thickness of the peripheral frame 3a and penetrates partially, in a controlled manner, in the second part 5b of the gas tank 5.
• a continuous weld seam C not shown in this example
• the assembly proposed by the first aspect of the invention also comprises a reinforcing ring 7 fixed to a second face of the peripheral frame 3a, opposite to the first face, by means of said continuous weld seam C, which traverses the entire thickness of the reinforcing ring 7, in a manner similar to that of the embodiment shown in FIGS. 5 and 6, but to attach to the gas reservoir 5, in particular on the peripheral zone of the second part 5b thereof.
• peripheral zone of the second part 5b of the gas reservoir 5 is disposed on an internal face thereof, in another embodiment (not shown), it is arranged on an outer face thereof, surrounding the opening 02.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Filtering Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=57629582

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (9)

• 2015
  • 2015-12-21 ES ES201531859A patent/ES2618883B1/es not_active Expired - Fee Related
• 2016
  • 2016-12-16 EP EP16819312.6A patent/EP3394416A1/de not_active Withdrawn
  • 2016-12-16 WO PCT/EP2016/081454 patent/WO2017108615A1/fr active Application Filing

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