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
  • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
  • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
• • 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
  • F02M26/29—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
  • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
  • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
  • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
  • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
  • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
  • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
  • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
  • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

• the present invention relates to a heat exchanger for gas, in particular for the exhaust gases of an engine.
• the invention is especially applicable to the exhaust gas recirculation exchangers (EGR).
• 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.
• the current configuration of RGE exchangers on the market is a metal heat exchanger typically made of stainless steel or aluminum.
• 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 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 exchange of heat. heat.
• 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.
• Said flange can be assembled with a gas tank, so that the gas tank is an intermediate piece between the housing and the flange, or the flange can be assembled directly to the housing. This latter design frequently corresponds to cases where the exchanger is directly connected to an EGR valve, whose function is to control the passage of the exhaust gases therethrough.
• the most common design includes a bypass duct that conducts the cooling fluid, which flows in the EGR exchanger, to the EGR valve. Since the EGR exchanger is assembled to the EGR circuit by a flange or peripheral collar, the bypass coolant conduit must be fabricated through said flange. In both types of EGR exchangers, most of their components are metallic, so that they are assembled by mechanical means and then oven-welded or arc-welded or laser-welded to ensure the proper sealing required this application.
• RGE exchangers with substantially rectangular cross-section tubes which use fins arranged inside said tubes to improve the heat transfer by means of these secondary surfaces, by means of which it is possible to increase the total heat exchange area.
• fin tubes such as the fin known as "fine offset”, which has a configuration of substantially rectangular profile repetitive in the transverse direction and has zigzag paths communicating with each other in the longitudinal direction, or for example the fin known as “wavy fin”, with channels that define wavy or sinusoidal trajectories.
• a primary goal of EGR heat exchangers is to achieve an appropriate distribution of the gas flow inside the gas channels, in this case inside the tubes or plates, so as to guarantee a heat flow. uniform throughout the interchange and to use the entire available trading area. This is why the shape of the gas tank, or other elements that can be assembled to the EGR heat exchanger on the path taken by the gases, is important, especially in the entry area.
• the design of these components is essential in the overall design of the exchanger. However, there are external constraints that make it difficult to optimize this design, since the shape and volume of these components are determined by the environment in which the EGR exchanger is located.
• the purpose of the gas heat exchanger, in particular the exhaust gases of an engine, according to the present invention is to solve the disadvantages that the exchangers known in the art present by proposing a compact and lengthy exchanger. reduced having optimum heat transfer at the gas flow inlet.
• the gas heat exchanger in particular the exhaust gas of an engine, object of the present invention is of the type which comprises a bundle of tubes or plates arranged inside a housing, said housing defining an inlet and a gas outlet intended to circulate inside said tubes or plates, the interior of each of said tubes or plates comprising disruptive means for the flow of gas to facilitate the heat exchange with a coolant, and it is characterized by the disturbing means comprise at least two sets of interfering elements arranged one inside the other inside each of said tubes or plates, each of said sets defining a subset independent of trajectories for the passage of the flow of gas inside said tubes or plates.
• each set of disturbing elements comprises a plurality of fins for the heat exchange, the plurality of fins of each set defining an independent subset of paths for the passage of the gas flow to the interior of said tubes or plates. It is advantageous to obtain these fins from a sheet of metal.
• the inner height of the tubes or plates of the exchanger is designed so that it is possible to introduce inside them at least two sets of fins arranged in stack on top of each other. Each of these sets defines an independent subset of trajectories for the passage of the gas flow.
• the fins of the two assemblies prefferably have a substantially rectangular repeating profile configuration in the transverse direction.
• the fins of the two assemblies have a "fine offset" configuration which defines zigzag trajectories for the passage of the gas flow in the longitudinal direction, said paths communicating with each other in said longitudinal direction.
• the fins of the two assemblies have a configuration of the "fine wavy" type which defines sinusoidal paths in the longitudinal direction for the passage of the gas flow.
• the use of two independent sets of sinusoidal fins makes it possible to obtain a compact heat exchanger which is particularly useful for preventing a pressure drop of the gases.
• the two sets of interfering elements are assembled to one another by welding or by mechanical means, in order to ensure a correct heat transfer.
• said sets of interfering elements are arranged one on the other so that one end of one of the assemblies is located in the longitudinal direction in an advanced or retracted position with respect to the position of the end of the other set at a lower level.
• Figure 1 is a perspective view showing the outer casing of a parallel tube heat exchanger and some of its connecting or connecting members;
• Figure 2 is a perspective view of two independent sets of interference elements configured in the form of fins of the "fine offset" type
• Figure 3 is a cross-section of a gas passage tube of the heat exchanger of Figure 1 with the sets of interfering elements of Figure 2;
• Figure 4 is a longitudinal section of a gas passage tube of the heat exchanger of Figure 1 which contains inside the sets of disturbing elements of Figure 2;
• Figure 5 is a perspective view of two sets of interference elements configured in the form of "wavy fin” type fins
• Figure 6 is a cross-section of a gas passage tube of a heat exchanger similar to that of Figure 1 which contains the interfering member assemblies of Figure 5 therein;
• Figure 7 is a longitudinal section of a gas passage tube of an exchanger which contains inside the sets of disturbing elements of Figure 5.
• the heat exchanger 1 for gas in particular for the exhaust gases of an engine, comprises a bundle of tubes 2 arranged inside a housing 3 defining an inlet 4 and an outlet 5 of gas intended for the circulation of gases with heat exchange with a coolant.
• a gas tank 6 and a flange 7 At one end of the exchanger there is a gas tank 6 and a flange 7 for connection with the gas recirculation circuit.
• Figures 2 to 4 correspond to a first embodiment of the exchanger 1 which comprises two sets 8a, 8b of disruptive elements configured in the form of fins 8, arranged in stacking on one another inside tubes 2 for the passage of gases.
• the section of each tube 2 is substantially rectangular and the fins 8 are obtained from a sheet of metal forming a configuration of disturbing elements of substantially rectangular profile which delimits trajectories 10a, 10b in zigzag communicating with each other in the longitudinal direction for the passage of the gas flow.
• the two sets 8a, 8b of disturbing elements in this case fins 8 are arranged assembled and stacked one on the other so as to define two sub-assemblies independent 10a, 10b trajectories for the passage of the gas flow.
• the assembly of the two sets of fins 8 can be performed by welding or by mechanical means.
• Figures 5 to 7 correspond to a second embodiment of the exchanger 1 which also comprises two sets 8c, 8d of disruptive elements configured in the form of fins 8, arranged in stacking on one another to the inside a tube 2 which, in this case, delimits two inner chambers 2a, 2b for the passage of the gas flow.
• the fins 8 of the two sets 8c, 8d have a configuration that defines sinusoidal paths 11a, 11b in the longitudinal direction for the passage of the gas flow (see FIG. 5).
• the two sets 8c, 8d of disturbing elements are stacked one on the other so as to define two independent subsets 1 1a, 1 1b of trajectories for the passage the flow of gas inside each tube 2 of the exchanger.
• the inner height of the gas passage tubes 2 of the exchanger 1 is designed so that it is possible to introduce inside them at least two sets 8a, 8b or 8c, 8d of fins 8 arranged in stacking one on the other. With this, it is possible to obtain a compact design of the exchanger as shown in Figure 1.
• This exchanger 1 has a very high efficiency and reduced length of the tubes 2, which saves space for design optimal and the ease of assembly of the assembly elements, such as for example the gas tank 6 or the flange 7 for connection to the gas recirculation circuit.
• the two sets 8a, 8b and 8c, 8d of fins have been arranged one on the other so that one end of one of the sets 8a, 8c of fins is located in the longitudinal direction in an advanced or retracted position with respect to the position of the end of the other set 8b, 8d of fins 8 located at a lower level (see Figures 2, 3, 5 and 7) .

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (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)

Applications Claiming Priority (2)

Publications (1)

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ID=56203332

Family Applications (1)

Country Status (3)

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• 2015
  • 2015-06-15 ES ES201530833A patent/ES2594361B1/es not_active Expired - Fee Related
• 2016
  • 2016-06-15 WO PCT/EP2016/063702 patent/WO2016202832A1/fr unknown
  • 2016-06-15 EP EP16731830.2A patent/EP3308094A1/de not_active Withdrawn

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