EP2901098A1 - Heat exchanger for gas, particularly the exhaust gases of an engine - Google Patents

Heat exchanger for gas, particularly the exhaust gases of an engine

Info

Publication number
EP2901098A1
EP2901098A1 EP13766112.0A EP13766112A EP2901098A1 EP 2901098 A1 EP2901098 A1 EP 2901098A1 EP 13766112 A EP13766112 A EP 13766112A EP 2901098 A1 EP2901098 A1 EP 2901098A1
Authority
EP
European Patent Office
Prior art keywords
carcass
exchanger
deflector
tubes
refrigerant
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.)
Granted
Application number
EP13766112.0A
Other languages
German (de)
French (fr)
Other versions
EP2901098B1 (en
Inventor
Jorge Ibarz Castello
José Antonio De La Fuente Romero
Eva Tomas Herrero
Francisco Lopez Lazaro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Termico SA
Original Assignee
Valeo Termico SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Termico SA filed Critical Valeo Termico SA
Publication of EP2901098A1 publication Critical patent/EP2901098A1/en
Application granted granted Critical
Publication of EP2901098B1 publication Critical patent/EP2901098B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F28F1/10—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)

Abstract

Heat exchanger (1) for gas, particularly the exhaust gases of an engine, comprising a bundle of tubes which are arranged inside a shell (2), which are intended for the circulation of the gases with exchange of heat with at least one stream of refrigerant, said tubes being fixed by their ends between two support plates (5) which are coupled in each end of the shell (2), and deflection means arranged inside the shell (2) and able to direct the at least one stream of refrigerant inside the shell (2). The deflection means comprise a longitudinal deflector (6, 6a) essentially parallel to the bundle of tubes and intended to divide the shell (2) into two circuits, said deflector being fixed by its longitudinal edges to the internal walls of the shell (2) and by its transverse edges to the two support plates (5) by welding. A more effective mounting of said deflector inside the exchanger is thus achieved.

Description

DESCRIPTION  DESCRIPTION
ECHANGEUR THERMIQUE DE GAZ, EN PARTICULIER DES GAZ D'ECHAPPEMENT D'UN MOTEUR THERMAL EXCHANGER OF GAS, ESPECIALLY EXHAUST GASES FROM AN ENGINE
La présente invention se réfère à un échangeur thermique de gaz, en particulier des gaz d'échappement d'un moteur. L'invention est particulièrement applicable à des échangeurs de recyclage de gaz d'échappement d'un moteur (EGRC) . ETAT ANTERIEUR DE LA TECHNIQUE DE L'INVENTION 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
Dans certains échangeurs thermiques de refroidissement des gaz, par exemple ceux utilisés dans les systèmes de recyclage des gaz d'échappement vers l'admission d'un moteur à explosion, les deux milieux qui échangent de la chaleur sont séparés par une cloison. In some heat exchangers for gas cooling, for example those used in exhaust gas recirculation systems to the admission of an internal combustion engine, the two media that exchange heat are separated by a partition.
La configuration actuelle des échangeurs EGR sur le marché correspond à un échangeur thermique métallique fabriqué généralement en acier inoxydable ou en aluminium . The current configuration of EGR exchangers on the market is a metal heat exchanger typically made of stainless steel or aluminum.
Il existe essentiellement deux types d'échangeurs thermiques EGR : un premier type consiste en une carcasse à l'intérieur de laquelle est disposé un faisceau de tubes parallèles pour le passage des gaz, le réfrigérant circulant à travers la carcasse, extérieurement aux tubes, et le second type consiste en une série de plaques parallèles qui constituent les surfaces d'échange thermique, de telle sorte que les gaz d'échappement et le réfrigérant circulent entre deux plaques, en couches alternées, l'échange thermique pouvant être amélioré par l'ajout d ' ailettes . 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.
Dans le cas des échangeurs thermiques à faisceau de tubes, le raccordement entre les tubes et la carcasse peut être de différents types. Généralement, les tubes sont fixés par leurs extrémités entre deux plaques de support accouplées à chaque extrémité de la carcasse, les deux plaques de support présentant une pluralité d'orifices pour le positionnement des tubes respectifs. In the case of heat exchangers with tube bundle, the connection between the tubes and the carcass can be of different types. Generally, 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.
Lesdites plaques de support sont fixées à leur tour à des moyens de connexion à la conduite de recyclage, lesquels peuvent consister en une connexion en V ou bien en un rebord périphérique de connexion ou bride, selon la conception de la conduite de recyclage où est monté l'échangeur. Le rebord périphérique peut être monté avec un réservoir de gaz, si bien que le réservoir de gaz est une pièce intermédiaire entre la carcasse et le rebord, ou bien le rebord peut monté directement sur la carcasse. Said support plates are in turn attached to 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.
Dans les deux types d'échangeurs EGR, leurs composants sont en majeure partie métalliques, si bien qu'ils sont montés par des moyens mécaniques puis soudés au four ou soudés à l'arc ou au laser pour assurer l'étanchéité adéquate requise pour cette application. Dans certains cas, certains composants de plastique peuvent aussi être inclus, lesquels peuvent avoir une fonction unique ou bien diverses fonctions intégrées dans une seule pièce. 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.
La fonction principale des échangeurs EGR est l'échange thermique entre les gaz d'échappement et le fluide réfrigérant, afin de refroidir les gaz. De plus, l'échangeur EGR doit satisfaire d'autres fonctions secondaires de pouvoir être monté sur le bloc moteur, permettre la connexion avec le fluide réfrigérant, ou permettre la connexion avec le circuit de gaz d'échappement, entre autres. Actuellement, les différents composants de l'échangeur sont joints à la carcasse par soudure au four ou par soudure à l'arc ou au laser. The main function of the EGR exchangers is the heat exchange between the exhaust gas and the refrigerant, in order to cool the gases. In addition, 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. Currently, the various components of the exchanger are joined to the carcass by welding in the oven or by arc welding or laser welding.
Certains échangeurs EGR à tubes ou plaques existant sur le marché comportent des déflecteurs, lesquels sont placés à l'intérieur du circuit du fluide réfrigérant. La conception et le nombre des déflecteurs peuvent varier d'une application à une autre, en fonction des exigences d'usage et des restrictions du constructeur de véhicules, en termes de conditions de fonctionnement ou de restrictions de conditionnement de l'échangeur. 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.
Dans la plupart des cas, les déflecteurs sont utilisés afin d'améliorer la circulation du fluide réfrigérant autour des tubes des gaz, évitant ainsi les points de stagnation qui pourraient causer l'ébullition du fluide réfrigérant à l'intérieur de l'échangeur, et afin d'améliorer la réfrigération de tous les tubes pour un meilleur rendement de 1 ' échangeur . In most cases, 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.
Dans d'autres cas, les déflecteurs sont inclus afin d'éviter les problèmes mécaniques qui peuvent apparaître dans les conditions de travail de l'échangeur dans le moteur. In other cases, the baffles are included to avoid mechanical problems that may occur in the working conditions of the exchanger in the engine.
On connaît un échangeur EGR qui utilise un déflecteur longitudinal qui divise l'intérieur de la carcasse en deux moitiés pour diriger en mode by-pass le fluide réfrigérant d'une moitié de la carcasse à l'autre quand les conduits d'entrée et de sortie du fluide réfrigérant se trouvent du même côté de la carcasses. Ce déflecteur est fixé à la carcasse de l'échangeur par des points de soudure et présente une longueur légèrement inférieure à la longueur de la carcasse. La demande de brevet espagnol n° 200931016, encore non publiée, du même titulaire que celui de la présente demande, comprend une pluralité de déflecteurs disposés transversalement le long de l'intérieur de la carcasse. Chaque déflecteur a une surface inférieure à la surface transversale de la carcasse ce qui permet le passage partiel du fluide réfrigérant. Lesdits déflecteurs ne sont pas alignés les uns avec les autres mais placés de manière alternée, laissant les zones de passage du fluide réfrigérant distribuées alternativement, assurant ainsi une distribution correcte du fluide réfrigérant, en plus d'améliorer la résistance mécanique aux vibrations. De plus lesdits déflecteurs sont fixés à la carcasse par soudure au four. An EGR exchanger is known 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. In addition, said deflectors are fixed to the carcass by welding in the oven.
Les brevets JP2002292089 et JP2000283666 comportent une pluralité de déflecteurs transversaux en forme de plaques disposés à l'intérieur d'une carcasse de coupe circulaire. La conception desdits déflecteurs est très semblable à la configuration des plaques de support situées aux deux extrémités de la carcasse, le diamètre desdits déflecteurs étant égal au diamètre intérieur de la carcasse, et comportent des ouvertures qui permettent le passage du fluide réfrigérant à travers eux. Les positions desdites ouvertures de passage dans les différents déflecteurs sont distribuées de façon alternée. En général, l'utilisation de déflecteurs à l'intérieur des échangeurs thermiques se généralise et est plus fréquente ces dernières années suite à la législation environnementale et aux restrictions de conception de certains types d ' échangeurs , tels que : les échangeurs thermiques qui permettent l'utilisation de deux circuits de fluide réfrigérant, qu'il s'agisse du même fluide ou non. Les échangeurs thermiques qui doivent refroidir deux fluides chauds, qu'il s'agisse du même fluide ou non . - Les échangeurs thermiques dont les conduits d'entrée et de sortie du fluide réfrigérant se trouvent du même côté de la carcasse. 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. In general, 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. use of two refrigerant circuits, whether the same fluid or not. Heat exchangers that must cool two hot fluids, whether the same fluid or not. - Heat exchangers in which the inlet and outlet of the refrigerant are on the same side of the carcass.
Le problème principal que pose l'usage de déflecteurs est d'assurer une étanchéité adéquate entre les deux circuits définis dans la carcasse de l'échangeur quand deux types de fluides réfrigérants sont employés, laquelle est liée à la manière de monter et de fixer ce déflecteur à l'intérieur de la carcasse, généralement au moyen de points de soudure, en respectant à la fois le comportement mécanique que doit présenter l'échangeur pour satisfaire les spécifications du constructeur de véhicules. Un autre problème que présente ce type de déflecteurs est de pouvoir assurer la position et l'orientation adéquates du déflecteur quand il est monté dans la carcasse avant sa soudure. DESCRIPTION DE L'INVENTION 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
Le but de l'échangeur thermique de gaz, en particulier des gaz d'échappement d'un moteur de la présente invention est de résoudre les inconvénients que présentent les échangeurs connus dans la technique, en fournissant un déflecteur destiné à améliorer la distribution d'un fluide réfrigérant qui circule dans l'échangeur, ou même à séparer deux fluides réfrigérants différents sans communication entre eux à l'intérieur d'une même carcasse, permettant un montage plus efficace dudit déflecteur à l'intérieur de l'échangeur. L'échangeur thermique de gaz, en particulier des gaz d'échappement d'un moteur, objet de la présente invention, est du type qui comprend un faisceau de tubes disposés à l'intérieur d'une carcasse, destinés à la circulation des gaz avec un échange thermique avec au moins un flux de fluide réfrigérant, lesdits tubes étant fixés par leurs extrémités entre deux plaques de support accouplées à chaque extrémité de la carcasse, et des moyens de déviation disposés à l'intérieur de la carcasse susceptibles de diriger 1 ' au moins un flux de fluide réfrigérant à l'intérieur de la carcasse, et il se caractérise par le fait que les moyens de déviation comprennent un déflecteur longitudinal sensiblement parallèle au faisceau de tubes, destiné à diviser la carcasse en deux circuits, ledit déflecteur étant fixé par ses bords longitudinaux aux parois internes de la carcasse et par ses bords transversaux aux deux plaques de support par soudure. 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. with a heat exchange with at least one flow of refrigerant fluid, said 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.
De cette façon, un positionnement et un montage plus simples du déflecteur sont réalisés à l'intérieur de la carcasse, ainsi qu'une meilleure fixation de celui-ci grâce à son raccordement par soudure. De préférence la soudure au four est employée, évitant ainsi le recours aux points de soudure comme pour les déflecteurs connus dans l'art de la technique. In this way, a simpler positioning and mounting of the deflector are made inside the carcass, and a better attachment thereof through its connection by welding. Preferably the baking is used, thus avoiding the use of soldering points as for deflectors known in the art.
Avantageusement, le déflecteur inclut dans ses bords longitudinaux deux ailettes périphériques pliées destinées à venir en contact avec les parois intérieures de la carcasse pour son raccordement par soudure . Advantageously, 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.
Avantageusement aussi, le déflecteur inclut dans ses bords transversaux deux segments saillants susceptibles de s'engager dans des rainures respectives pratiquées dans les plaques de support pour son raccordement par soudure. L'utilisation desdites ailettes périphériques et des segments saillants garantit un positionnement et une orientation adéquats du déflecteur à 1 ' intérieur de la carcasse, avant sa fixation par soudure. Selon une première réalisation, le déflecteur comprend une surface fermée pour éviter la communication entre les deux circuits dans la carcasse ; Dans ce cas, l'échangeur comporte deux paires de conduits d'entrée et de sortie prévus pour la distribution de deux flux de fluide réfrigérant différents . Selon une seconde réalisation, le déflecteur comprend une ouverture traversante dans sa surface capable de mettre en communication deux circuits dans la carcasse . Dans cet autre cas, l'échangeur comporte une paire de conduits d'entrée et de sortie disposés dans une même extrémité de la carcasse pour la distribution d'un flux de fluide réfrigérant. BREVE DESCRIPTION DES DESSINS Advantageously also, 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. In a first embodiment, the deflector comprises a closed surface to prevent communication between the two circuits in the carcass; In this case, the exchanger comprises two pairs of inlet and outlet ducts provided for the distribution of two different refrigerant fluid streams. According to a second embodiment, the deflector comprises a through opening in its surface capable of communicating two circuits in the carcass. In this other case, 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. BRIEF DESCRIPTION OF THE DRAWINGS
Afin de faciliter la description de ce qui a été susmentionné, nous joignons des dessins qui représentent, schématiquement et uniquement à titre d'exemple non limitatif, un cas pratique de réalisation de l'échangeur thermique de gaz, en particulier des gaz d'échappement d'un moteur de l'invention, dans lesquels : la figure 1 est une vue en perspective et partiellement en coupe de l'échangeur thermique de l'invention, montrant l'emplacement du déflecteur et les deux circuits par lesquels circulent respectivement deux fluides réfrigérants ; la figure 2 est une vue en perspective du déflecteur selon une première réalisation de l'invention ; la figure 3 est une vue en perspective du déflecteur selon une seconde réalisation de l'invention ; la figure 4 est une vue en perspective d'un type d'échangeur qui utilise un même type de fluide réfrigérant avec ses conduits d'entrée et de sortie situés dans une même extrémité de la carcasse ; la figure 5 est une vue en coupe de l'échangeur de la figure 4, montrant le déflecteur utilisé et le parcours du fluide réfrigérant ; la figure 6 est une vue en perspective d'un déflecteur montrant les ailettes longitudinales de fixation ; la figure 7 est une vue partielle en perspective de la carcasse de l'échangeur, montrant le déflecteur monté et fixé aux parois internes de la carcasse grâce aux ailettes longitudinales ; les figures 8 et 9 sont des vues en perspective et en plan respectivement d'une extrémité du déflecteur selon l'invention, montrant un segment saillant prévu pour l'emboîtement avec une plaque de support des tubes ; la figure 10 est une vue en perspective d'une plaque de support, montrant une rainure d'emboîtement destinée à recevoir le segment saillant du déflecteur ; la figure 11 est une vue en perspective du déflecteur monté dans la plaque de support illustrée à la figure 10 ; les figures 12 et 13 sont respectivement des vues en perspective de deux configurations d'échangeurs thermiques qui utilisent deux types de fluides réfrigérants différents, montrant l'emplacement des paires respectives de conduits d'entrée et de sortie des deux fluides réfrigérants ; et la figure 14 est une vue en coupe et en perspective d'un échangeur thermique qui utilise un fluide réfrigérant unique, montrant l'emplacement de la paire de conducteurs d'entrée et de sortie situés dans une même extrémité de la carcasse. In order to facilitate the description of what has been mentioned above, we enclose drawings which represent, schematically and solely by way of non-limiting example, a practical case of realization of the gas heat exchanger, in particular exhaust gases. of an engine of the invention, in which: 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 of the exchanger, showing the deflector mounted and fixed to the inner walls of the carcass with the longitudinal fins; Figures 8 and 9 are views in perspective and in plan respectively of an end of the deflector according to the invention, showing a projecting segment provided for the interlocking with a tube support plate; Figure 10 is a perspective view of a support plate, showing a nesting groove for receiving the projecting segment of the deflector; Figure 11 is a perspective view of the baffle mounted in the support plate shown in Figure 10; Figs. 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.
DESCRIPTION D'UNE REALISATION PRÉFÉRÉE A la figure 1 est représenté partiellement un échangeur thermique 1 qui comprend un faisceau de tubes (non représentés pour raisons de clarté) disposés à l'intérieur d'une carcasse 2, définissant une entrée 3 et une sortie 4 de gaz, lesdits tubes étant destinés à la circulation des gaz avec un échange thermique avec au moins un fluide réfrigérant. Les tubes sont fixés par leurs extrémités entre deux plaques de support 5 accouplées dans chaque extrémité de la carcasse 2, les deux plaques de support 5 présentant une pluralité d'orifices pour le positionnement des tubes respectifs . Ainsi, l'échangeur 1 comporte des moyens de déviation disposés à l'intérieur de la carcasse 2 susceptibles de diriger 1 ' au moins un fluide réfrigérant dans la carcasse 2. Dans ce cas, les moyens de déviation comprennent un déflecteur longitudinal 6 sensiblement parallèle au faisceau de tubes, destiné à diviser la carcasse 2 en deux circuits. DESCRIPTION OF A PREFERRED EMBODIMENT In FIG. 1 is partially shown 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. Thus, the exchanger 1 comprises deflection means disposed inside the carcass 2 capable of directing the at least one refrigerant fluid in the carcass 2. In this case, the deflection means comprise a substantially parallel longitudinal deflector 6 to the bundle of tubes, for dividing the carcass 2 into two circuits.
Le déflecteur situé dans la carcasse 2 de l'échangeur 1 permet d'améliorer la distribution d'un fluide réfrigérant ou même de séparer deux fluides différents, tout comme de l'huile et un fluide de réfrigération, sans communication entre les deux à l'intérieur d'une carcasse 2 commune. Deux réalisations du déflecteur sont montrées ci-après. 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.
Selon une première réalisation montrée à la figure 2, le déflecteur 6 comprend une surface fermée et homogène qui permet une parfaite étanchéité entre les circuits de deux fluides réfrigérants. La finalité dudit déflecteur 6 est de séparer deux fluides réfrigérants différents à l'intérieur de la carcasse 2, en raison de leurs compositions, propriétés, etc. différentes. Ce type de déflecteur 6 est utilisé dans des échangeurs dans lesquels il est nécessaire d'utiliser différents circuits de fluide réfrigérant dans l'échangeur pour produire l'échange thermique avec les gaz d'échappement qui circulent dans les tubes . According to a first embodiment shown in Figure 2, 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.
A la figure 1 est illustré un échangeur 1 qui utilise ledit déflecteur 6 pour séparer deux types de fluide réfrigérant. Dans ce cas, deux conduits d'entrée différents 7, 7a, et deux conduits de sortie différents 8, 8a sont nécessaires dans un même échangeur 1. De cette façon, une séparation adéquate des deux fluides réfrigérants dans une même carcasse 2 est réalisée. A la figure 1, l'entrée et la sortie des deux fluides réfrigérants dans la carcasse 2, ainsi que l'entrée et la sortie des gaz dans la carcasse 2 et leur changement de sens dans un réservoir de gaz (non représenté) sont représentées. In Figure 1 is illustrated an exchanger 1 which uses said deflector 6 to separate two types of refrigerant. In this case, two different inlet ducts 7, 7a, and two different outlet ducts 8, 8a are required in the same exchanger 1. In this way, an adequate separation of the two refrigerants in the same carcass 2 is achieved. In Figure 1, 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.
Selon une seconde réalisation montrée à la figure 3, le déflecteur 6a comprend une ouverture passante 9 dans sa surface pour le passage d'un fluide réfrigérant depuis une moitié jusqu'à une autre moitié de la carcasse 2, afin d'optimiser la distribution du fluide réfrigérant dans la carcasse 6. Ce type de déflecteur 6a est donc utilisé pour incrémenter les rendements ou améliorer la distribution du fluide réfrigérant dans la carcasse 2. According to a second embodiment shown in FIG. 3, 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.
Les figures 4 et 5 illustrent un échangeur 1 qui utilise ledit déflecteur 6a, dont les conducteurs d'entrée 7 et de sortie 8 sont situés dans un même extrême de la carcasse 2. A la figure 4 l'entrée et la sortie du fluide réfrigérant dans la carcasse 2 sont représentés par des flèches. 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. In FIG. 4, the inlet and the outlet of the cooling fluid in the carcass 2 are represented by arrows.
En raison des restrictions de conditionnement ou des impératifs du constructeur de véhicules, il est possible que les conducteurs d'entrée 7 et de sortie 8 du fluide réfrigérant aient à être placés à une courte distance l'un de l'autre ou même dans la même extrémité de la carcasse 2, ce qui peut occasionner un trajet préférable pour le fluide réfrigérant et affecter en conséquence le remplissage du fluide réfrigérant et entraîner une mauvaise réfrigération des tubes de gaz, et donner également lieu à des points de stagnation pouvant provoquer un phénomène d'ébullition risquant d'endommager 1 'échangeur. Dans ce cas, le déflecteur 6a pourvu de son ouverture 9 permet d'améliorer la circulation du fluide réfrigérant dans 1 'échangeur. La configuration du déflecteur 6, 6a de la présente invention inclut des ailettes périphériques pliées 10 dans ses deux bords longitudinaux, comme on le peut le voir à la figure 6, destinées à raccorder le déflecteur 6, 6a à deux cloisons internes de la carcasse 2 de préférence par soudure au four (voir la figure 7) . De cette façon, le recours à des points de soudure entre le déflecteur 6, 6a et la carcasse 2 tels qu'utilisés avec les déflecteurs connus dans l'état de l'art est aboli. Due to packaging restrictions or requirements of the vehicle manufacturer, it is possible that 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. In this case, 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.
Ainsi, le déflecteur 6, 6a de la présente invention inclut dans ses bords transversaux deux segments saillants 11, comme l'illustrent les figures 6, 8 et 9, susceptible de s'emboîter dans des rainures respectives (12) pratiquées dans les plaques de support 5 (voir les figures 10 et 11), permettant au déflecteur 6, 6a de rester fixé à la position appropriée avant sa soudure. Dans ce cas, le montage du déflecteur 6, 6a est réalisé d'une façon semblable au processus de montage des tubes avec lesdites plaques de support 5. A titre d'exemple, les figures 1, 12 et 13 illustrent respectivement des configurations distinctes d'échangeurs 1 qui utilisent deux fluides réfrigérants, leurs conduits respectifs d'entrée 4, 4a et de sortie 8, 8a étant disposés à différentes positions relativement à la carcasse 2. Dans ce cas, un déflecteur 6 fermé est utilisé (voir la figure 2) pour séparer les deux fluides réfrigérants. Thus, 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. In this case, 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. By way of example, 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. In this case, a closed baffle 6 is used (see Figure 2 ) to separate the two refrigerants.
D'autre part, les figures 4 et 14 montrent respectivement différentes configurations d'échangeurs qui utilisent un même fluide réfrigérant dont la paire de conduits d'entrée 7 et de sortie 8 est située dans la même extrémité de la carcasse 2, lesdits conduits 7, 8 étant disposés à différentes positions relatives dans la carcasse 2. Dans ce cas, un déflecteur 6a pourvu d'une ouverture passante 9 (voir la figure 3) pour améliorer la distribution du fluide réfrigérant est utilisé. On the other hand, 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. In this case, a deflector 6a provided with a through opening 9 (see Figure 3) to improve the distribution of the refrigerant fluid is used.
Le déflecteur 6, 6a de l'invention peut être utilisé dans des échangeurs fabriqués en acier inoxydable ou en aluminium. The deflector 6, 6a of the invention can be used in exchangers made of stainless steel or aluminum.

Claims

REVENDICATIONS
1. Echangeur thermique (1) de gaz, en particulier des gaz d'échappement d'un moteur, qui comprend un faisceau de tubes disposés à l'intérieur d'une carcasse (2), destinés à la circulation des gaz avec un échange thermique avec au moins un flux de fluide réfrigérant, lesdits tubes étant fixés par leurs extrémités entre deux plaques de support (5) accouplées dans chaque extrémité de la carcasse (2), et des moyens de déviation disposés à l'intérieur de la carcasse (2) susceptibles de diriger 1 ' au moins un flux de fluide réfrigérant à l'intérieur de la carcasse (2), caractérisé par le fait que les moyens de déviation comprennent un déflecteur longitudinal (6, 6a) sensiblement parallèle au faisceau de tubes, destiné à diviser la carcasse (2) en deux circuits, ledit déflecteur (6, 6a) étant fixé par ses bords longitudinaux aux parois internes de la carcasse (2) et par ses bords transversaux aux deux plaques de support (5) par soudure. A heat exchanger (1) for gas, in particular an engine exhaust gas, comprising a bundle of tubes arranged inside a carcass (2), intended for the circulation of gases with an exchange with at least one coolant flow, said tubes being fixed at their ends between two support plates (5) coupled in each end of the carcass (2), and deflection means disposed inside the carcass ( 2) capable of directing the at least one flow of refrigerant fluid inside the carcass (2), characterized in that the deflection means comprise a longitudinal deflector (6, 6a) substantially parallel to the tube bundle, for dividing the carcass (2) into two circuits, said deflector (6, 6a) being fixed by its longitudinal edges to the inner walls of the carcass (2) and its transverse edges to the two support plates (5) by welding.
2. Echangeur (1) selon la revendication 1, dans lequel le déflecteur (6, 6a) inclut dans ses bords longitudinaux deux ailettes périphériques pliées (10) destinées à venir en contact avec les parois intérieures de la carcasse (2) pour son raccordement par soudure. 2. Exchanger (1) according to claim 1, wherein the baffle (6, 6a) includes in its longitudinal edges two folded peripheral fins (10) intended to come into contact with the inner walls of the carcass (2) for its connection. by welding.
3. Echangeur (1) selon la revendication 1, dans lequel le déflecteur (6, 6a) inclut dans ses bords transversaux deux segments saillants (11) susceptibles de s'emboîter dans des rainures (12) respectives pratiquées dans les plaques de support (5) pour son raccordement par soudure. 3. Exchanger (1) according to claim 1, wherein the baffle (6, 6a) includes in its transverse edges two projecting segments (11) engageable in grooves (12) respectively formed in the support plates ( 5) for its connection by welding.
4. Echangeur (1) selon la revendication 1, dans lequel le déflecteur (6) comprend une surface fermée pour éviter la communication entre les deux circuits dans la carcasse (2) . 4. Exchanger (1) according to claim 1, wherein the deflector (6) comprises a closed surface to avoid communication between the two circuits in the carcass (2).
5. Echangeur (1) selon la revendication 4, lequel inclut deux paires de conduits d'entrée (7, 7a) et de sortie (8, 8a) prévus pour la distribution de deux flux de fluide réfrigérant différents. 5. Exchanger (1) according to claim 4, which includes two pairs of inlet ducts (7, 7a) and outlet (8, 8a) provided for the distribution of two different refrigerant fluid streams.
6. Echangeur (1) selon la revendication 1, dans lequel le déflecteur (6a) comprend une ouverture traversante (9) dans sa surface capable de mettre en communication les deux circuits dans la carcasse (2) . 6. Exchanger (1) according to claim 1, wherein the baffle (6a) comprises a through opening (9) in its surface capable of communicating the two circuits in the carcass (2).
7. Echangeur (1) selon la revendication 6, lequel comporte une paire de conduits d'entrée (7) et de sortie (8) disposés dans une même extrémité de la carcasse (2) pour la distribution d'un flux de fluide réfrigérant . 7. Exchanger (1) according to claim 6, which comprises a pair of inlet ducts (7) and outlet (8) disposed in one end of the carcass (2) for dispensing a flow of refrigerant fluid. .
EP13766112.0A 2012-09-25 2013-09-24 Heat exchanger for gas, particularly the exhaust gases of an engine Active EP2901098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201231479A ES2450791B1 (en) 2012-09-25 2012-09-25 Heat exchanger for gases, especially the exhaust gases of an engine
PCT/EP2013/069863 WO2014048923A1 (en) 2012-09-25 2013-09-24 Heat exchanger for gas, particularly the exhaust gases of an engine

Publications (2)

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EP2901098A1 true EP2901098A1 (en) 2015-08-05
EP2901098B1 EP2901098B1 (en) 2017-03-15

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EP13766112.0A Active EP2901098B1 (en) 2012-09-25 2013-09-24 Heat exchanger for gas, particularly the exhaust gases of an engine

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US (1) US20150253085A1 (en)
EP (1) EP2901098B1 (en)
KR (1) KR20150056860A (en)
ES (2) ES2450791B1 (en)
WO (1) WO2014048923A1 (en)

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ES2729205A1 (en) * 2018-04-30 2019-10-30 Valeo Termico Sa HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE (Machine-translation by Google Translate, not legally binding)
ES2732676A1 (en) * 2018-05-24 2019-11-25 Valeo Termico Sa HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE (Machine-translation by Google Translate, not legally binding)
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Also Published As

Publication number Publication date
US20150253085A1 (en) 2015-09-10
WO2014048923A1 (en) 2014-04-03
KR20150056860A (en) 2015-05-27
ES2450791A1 (en) 2014-03-25
EP2901098B1 (en) 2017-03-15
ES2625115T3 (en) 2017-07-18
ES2450791B1 (en) 2015-01-16

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