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
  • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
  • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
• • 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
  • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D21/0001—Recuperative heat exchangers
  • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/0041—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 for only one medium being tubes having parts touching each other or tubes assembled in panel form
• • 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
  • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
• • 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
  • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
  • F28D7/0075—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with particular circuits for the same heat exchange medium, e.g. with the same heat exchange medium flowing through sections having different heat exchange capacities or for heating or cooling the same heat exchange medium at different temperatures
• • 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
  • 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
  • F28F9/04—Arrangements for sealing elements into header boxes or end plates
  • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
  • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
  • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments

Definitions

• the present invention refers to a gas heat exchanger, in particular an engine exhaust gas.
• the invention is particularly applicable to exhaust gas recirculation exchangers (EGRC). PRIOR STATE OF THE TECHNIQUE OF THE INVENTION
• the two media that exchange heat are separated by a partition.
• EGR exchangers on the market is a metal heat exchanger typically made of stainless steel or aluminum.
• EGR heat exchanger There are essentially two types of EGR heat exchanger: a first type consists of a carcass inside which is disposed a bundle of parallel tubes for the passage of gases, the refrigerant flowing through the carcass, 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, the heat exchange being able to be improved by the adding fins.
• connection between the tubes and the carcass can be of different types.
• the tubes are fixed at their ends between two support plates coupled to each end of the carcass, the two support plates having a plurality of orifices for positioning the respective tubes.
• connection means to the recycling line which may consist of a V-shaped connection or a peripheral flange connection or flange, according to the design of the recycling pipe where is mounted the exchanger.
• the peripheral rim can be mounted with a gas tank, so that the gas tank is an intermediate piece between the carcass and the rim, or the rim can be mounted directly on the carcass.
• EGR exchangers In both types of EGR exchangers, their components are mostly metallic, so they are mounted mechanically and then oven-welded or arc-welded or laser-welded to provide the proper seal required for this purpose. application. In some cases, some plastic components may also be included, which may have a single function or various functions integrated in a single room.
• the main function of the EGR exchangers is the heat exchange between the exhaust gas and the refrigerant, in order to cool the gases.
• the EGR exchanger must meet other secondary functions to be mounted on the engine block, allow connection with the refrigerant, or allow connection with the exhaust gas circuit, among others.
• the various components of the exchanger are joined to the carcass by welding in the oven or by arc welding or laser welding.
• Some existing tube or plate EGR exchangers have deflectors, which are placed inside the refrigerant circuit.
• the design and number of baffles may vary from application to application, depending on the usage requirements and restrictions of the vehicle manufacturer, in terms of operating conditions or conditioning restrictions of the exchanger.
• the baffles are used to improve the circulation of the refrigerant around the tubes of gases, thus avoiding the stagnation points that could cause the boiling of the refrigerant inside the exchanger, and in order to improve the refrigeration of all the tubes for a better performance of the exchanger.
• the baffles are included to avoid mechanical problems that may occur in the working conditions of the exchanger in the engine.
• An EGR exchanger which uses a longitudinal baffle which divides the inside of the carcass into two halves to bypass coolant from one half of the carcass to the other when the inlet and outlet ducts refrigerant outlet are on the same side of the carcass.
• This deflector is attached to the carcass of the exchanger by welding points and has a length slightly less than the length of the carcass.
• Spanish patent application no. 200931016 still unpublished, of the same holder as that of the present application, comprises a plurality of deflectors arranged transversely along the inside of the carcass. Each deflector has a surface smaller than the transverse surface of the carcass which allows the partial passage of the refrigerant fluid.
• Said deflectors are not aligned with each other but placed alternately, leaving the coolant passage zones alternately distributed, thus ensuring a proper distribution of the coolant, in addition to improving the mechanical resistance to vibration.
• said deflectors are fixed to the carcass by welding in the oven.
• JP2002292089 and JP2000283666 patents comprise a plurality of plate-shaped transverse deflectors disposed within a circular cutting carcass.
• the design of said baffles is very similar to the configuration of the support plates at both ends of the carcass, the diameter of said baffles being equal to the inside diameter of the carcass, and have openings which allow the passage of refrigerant through them.
• the positions of said passage openings in the different deflectors are distributed alternately.
• the use of baffles inside heat exchangers is becoming more widespread and is more frequent in recent years as a result of environmental legislation and design restrictions on certain types of heat exchangers, such as: heat exchangers that allow the use of heat exchangers.
• baffles The main problem posed by the use of baffles is to ensure an adequate seal between the two circuits defined in the shell of the exchanger when two types of coolants are used, which is related to the manner of mounting and fixing this deflector inside the carcass, usually by means of welding points, respecting both the mechanical behavior that must present the exchanger to meet the specifications of the vehicle manufacturer. Another problem with this type of baffle is to ensure the proper position and orientation of the deflector when it is mounted in the carcass before welding. DESCRIPTION OF THE INVENTION
• the purpose of the gas heat exchanger, in particular the exhaust gases of an engine of the present invention is to overcome the disadvantages of exchangers known in the art, by providing a baffle for improving the distribution of a refrigerant fluid that circulates in the exchanger, or even to separate two different refrigerants without communication between them within the same carcass, allowing a more effective mounting of said baffle inside the exchanger.
• the gas heat exchanger, in particular the exhaust gas of an engine, which is the subject of the present invention is of the type which comprises a bundle of tubes arranged inside a carcass, intended for the circulation of gases.
• the tubes being fixed at their ends between two support plates coupled to each end of the carcass, and deflection means disposed inside the carcass capable of directing 1 at least one coolant flow inside the carcass, and it is characterized in that the deflection means comprise a longitudinal deflector substantially parallel to the tube bundle, for dividing the carcass into two circuits, said deflector being fixed by its longitudinal edges to the internal walls of the carcass and its transverse edges to the two support plates by welding.
• the deflector includes in its longitudinal edges two folded peripheral fins intended to come into contact with the inner walls of the carcass for its connection by welding.
• the deflector includes in its transverse edges two projecting segments capable of engaging in respective grooves formed in the support plates for its connection by welding.
• the use of said peripheral fins and projecting segments ensures proper positioning and orientation of the baffle within the carcass prior to attachment by welding.
• the deflector comprises a closed surface to prevent communication between the two circuits in the carcass;
• the exchanger comprises two pairs of inlet and outlet ducts provided for the distribution of two different refrigerant fluid streams.
• the deflector comprises a through opening in its surface capable of communicating two circuits in the carcass.
• the exchanger comprises a pair of inlet and outlet conduits disposed in the same end of the carcass for dispensing a flow of refrigerant fluid.
• Figure 1 is a perspective view and partially in section of the heat exchanger of the invention, showing the location of the baffle and the two circuits through which respectively circulating two refrigerants;
• Figure 2 is a perspective view of the baffle according to a first embodiment of the invention;
• Figure 3 is a perspective view of the deflector according to a second embodiment of the invention;
• Figure 4 is a perspective view of a type of exchanger that uses the same type of refrigerant with its inlet and outlet ducts located in the same end of the carcass;
• Figure 5 is a sectional view of the exchanger of Figure 4, showing the deflector used and the course of the refrigerant fluid;
• Figure 6 is a perspective view of a deflector showing the longitudinal fixing fins;
• Figure 7 is a partial perspective view of the carcass
• Fig. 12 and 13 are respectively perspective views of two configurations of heat exchangers that utilize two different types of coolant fluids, showing the location of the respective pairs of inlet and outlet conduits of the two refrigerant fluids; and Fig. 14 is a sectional and perspective view of a heat exchanger that uses a single refrigerant, showing the location of the pair of input and output conductors located in one end of the carcase.
• FIG. 1 DESCRIPTION OF A PREFERRED EMBODIMENT
• a heat exchanger 1 which comprises a bundle of tubes (not shown for the sake of clarity) disposed inside a carcass 2, defining an inlet 3 and an outlet 4 of gas, said tubes being intended for the circulation of gases with a heat exchange with at least one refrigerant.
• the tubes are fixed at their ends between two support plates 5 coupled in each end of the carcass 2, the two support plates 5 having a plurality of orifices for positioning the respective tubes.
• the exchanger 1 comprises deflection means disposed inside the carcass 2 capable of directing the at least one refrigerant fluid in the carcass 2.
• the deflection means comprise a substantially parallel longitudinal deflector 6 to the bundle of tubes, for dividing the carcass 2 into two circuits.
• the deflector located in the casing 2 of the exchanger 1 makes it possible to improve the distribution of a refrigerant fluid or even to separate two different fluids, just like oil and a refrigeration fluid, without communication between the two. inside a common carcass 2. Two embodiments of the deflector are shown below.
• the deflector 6 comprises a closed and homogeneous surface which allows a perfect seal between the circuits of two refrigerants.
• the purpose of said deflector 6 is to separate two different refrigerants in the interior of the carcass 2, because of their compositions, properties, etc. different.
• This type of deflector 6 is used in exchangers in which it is necessary to use different refrigerant circuits in the exchanger to produce heat exchange with the exhaust gas flowing in the tubes.
• FIG 1 is illustrated an exchanger 1 which uses said deflector 6 to separate two types of refrigerant.
• two different inlet ducts 7, 7a, and two different outlet ducts 8, 8a are required in the same exchanger 1.
• an adequate separation of the two refrigerants in the same carcass 2 is achieved.
• entry and exit the two refrigerants in the carcass 2 and the entry and exit of the gases in the carcass 2 and their change of direction in a gas tank (not shown) are shown.
• the deflector 6a comprises a through opening 9 in its surface for the passage of a refrigerant fluid from one half to another half of the carcass 2, in order to optimize the distribution of the refrigerant fluid in the carcass 6.
• This type of deflector 6a is used to increase the yields or improve the distribution of the refrigerant in the carcass 2.
• FIGS. 4 and 5 illustrate an exchanger 1 which uses said deflector 6a, the input and output conductors 7 of which are located at the same end of the frame 2.
• the inlet and the outlet of the cooling fluid in the carcass 2 are represented by arrows.
• the inlet 7 and the outlet 8 of the coolant have to be placed at a short distance from each other or even same end of the carcass 2, which may cause a preferable path for the coolant and affect accordingly the filling of the refrigerant and lead to poor refrigeration of the gas tubes, and also give rise to stagnation points that can cause a phenomenon boiling may damage the exchanger.
• the deflector 6a provided with its opening 9 improves the circulation of the refrigerant in the exchanger.
• the configuration of the deflector 6, 6a of the present invention includes peripheral fins 10 folded in its two longitudinal edges, as can be seen in Figure 6, for connecting the deflector 6, 6a to two internal walls of the carcass 2 preferably by baking (see Figure 7). In this way, the use of welding points between the deflector 6, 6a and the carcass 2 as used with the deflectors known in the state of the art is abolished.
• the deflector 6, 6a of the present invention includes in its transverse edges two projecting segments 11, as illustrated in FIGS. 6, 8 and 9, capable of fitting into respective grooves (12) made in the plates of support 5 (see Figures 10 and 11), allowing the baffle 6, 6a to remain attached to the appropriate position before welding.
• the mounting of the deflector 6, 6a is carried out in a manner similar to the process of mounting the tubes with said support plates 5.
• FIGS. 1, 12 and 13 respectively illustrate distinct configurations of exchangers 1 which use two coolants, their respective inlet ducts 4, 4a and outlet 8, 8a being arranged at different positions relative to the carcass 2.
• a closed baffle 6 is used (see Figure 2 ) to separate the two refrigerants.
• FIGS. 4 and 14 respectively show different configurations of exchangers that use the same refrigerant fluid whose pair of inlet and outlet ducts 7 and 8 are situated in the same end of the carcass 2. said ducts 7, 8 being arranged at different relative positions in the casing 2.
• a deflector 6a provided with a through opening 9 (see Figure 3) to improve the distribution of the refrigerant fluid is used.
• the deflector 6, 6a of the invention can be used in exchangers made of stainless steel or aluminum.

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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)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

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• 2012
  • 2012-09-25 ES ES201231479A patent/ES2450791B1/es not_active Expired - Fee Related
• 2013
  • 2013-09-24 US US14/431,138 patent/US20150253085A1/en not_active Abandoned
  • 2013-09-24 EP EP13766112.0A patent/EP2901098B1/de active Active
  • 2013-09-24 WO PCT/EP2013/069863 patent/WO2014048923A1/fr active Application Filing
  • 2013-09-24 ES ES13766112.0T patent/ES2625115T3/es active Active
  • 2013-09-24 KR KR1020157010577A patent/KR20150056860A/ko active Search and Examination

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