US20060032626A1 - Device for heat exchange between flowable media - Google Patents

Device for heat exchange between flowable media Download PDF

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Publication number
US20060032626A1
US20060032626A1 US10/518,230 US51823005A US2006032626A1 US 20060032626 A1 US20060032626 A1 US 20060032626A1 US 51823005 A US51823005 A US 51823005A US 2006032626 A1 US2006032626 A1 US 2006032626A1
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US
United States
Prior art keywords
fluid
flat tube
chamber
outlet chamber
passage
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.)
Abandoned
Application number
US10/518,230
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English (en)
Inventor
Mark Keen
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.)
Hydac SA
Original Assignee
Hydac 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 Hydac SA filed Critical Hydac SA
Assigned to HYDAC S.A. reassignment HYDAC S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEEN, MARK GRAEME
Publication of US20060032626A1 publication Critical patent/US20060032626A1/en
Abandoned legal-status Critical Current

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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
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • 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
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the invention relates to a device for heat exchange between flowable media at least one of which is in the liquid state.
  • the structural members causing the swirling effect a certain amount of throttling of the fluid flow, so that a differential pressure determined by the throttling is established between the inlet chamber on the inlet side for the fluid to be chilled and the outlet chamber of the fluid.
  • a differential pressure determined by the throttling is established between the inlet chamber on the inlet side for the fluid to be chilled and the outlet chamber of the fluid.
  • a bypass flow mechanism is customarily provided between inlet chamber and outlet chamber of the device; this mechanism is normally closed but has a pressure control mechanism which permits bypass flow of the fluid until the differential pressure drops to a certain value and the viscosity is accordingly reduced, when the fluid to be chilled has reached its operating temperature, a value at which the bypass flow is blocked and the fluid flows exclusively over the fluid paths for heat exchange.
  • DE-A-41 06 963 discloses a cooling device for fluid media, in particular water coolers for hydraulic assemblies operated by oil and internal combustion engines in which a cooling medium II to be chilled is brought into indirect contact with a cooling medium I so that heat exchange is effected, this device having a conventional oil-air cooler with connecting branches for intake or discharge of medium II into or from a cooling element having several parallel cooling channels spaced a certain distance from each other and the interstices between which are filled with blades, channels through which medium I moves in turbulent flow, and a cover being provided on the longitudinal sides having connecting branches, this cover being fastened in the area of the connecting branches and having interior and exterior seals, and having a hollow cast element in the shape approximately of a cuboid with several chambers and connections for intake and discharge of the medium I into which the oil-air cooler is introduced and in which it is secured so that when in the operating state the outer edge of the cover adjoins the edge of the housing by way of a seal to effect sealing.
  • the object of the invention is to retain the advantages presented by the state of the art and further to improve the known devices so that they are characterized by especially simple structure which may be designed by a simple and cost-effective method and so that nevertheless a high degree of safety is reached with the medium to be chilled in operation over the widest possible range of temperatures.
  • the device claimed for the invention has a heat exchanger block in which the fluid paths for the fluid participating in heat exchange extend between an inlet chamber delimiting the block on one side and a outlet chamber delimiting the block on the opposite side, fluid paths and paths of flow for conducting the other medium capable of flow, such as cooling air, alternating, that is, being superimposed one on the other in the block.
  • a cover plate is provided as the upper element closing the block.
  • the cover plate has at least one interior passage which bypasses the fluid paths and extends as bypass channel from the inlet chamber to the outlet chamber, this passage may be closed or opened by means of a pressure control mechanism as a function of the differential pressure between inlet chamber and outlet chamber.
  • the bypass mechanism provided as safety mechanism to prevent building up of overpressure is integrated into the cover plate of the heat exchanger block. This results in significant simplification of the structure of the device, which may be produced by simple and inexpensive means as desired.
  • the structural members forming the fluid paths and paths of flow may be soldered together one above the other to form a block with the desired number of elements, at the same time the cover plate forming the secondary flow mechanism may be fastened on the upper side of the block by soldering.
  • cover plate a section of hollow cast element made by extrusion in the form of a flat tube which is closed by a sealing plate at both ends.
  • the section of hollow cast element may be extruded so that a single flat tube is formed, that is, so that a single passageway is made in the cover plate as thus formed. It may, however, be advantageous for the section of hollow cast elements forming the flat tube to be extruded so that the flat tube has two interior passages.
  • the wall of the flat tube is provided with passage bores which permit fluid connection to inlet chamber and outlet chamber in the end areas of each passage.
  • At least one pressure control mechanism is provided for each passage of the flat tube. These mechanisms may be mounted in one of the passage bores in the flat tube.
  • a return valve in the form of a spring-loaded seat valve is provided as pressure control mechanism for each passage.
  • the flat tube forming the cover plate at the ends of the passage or passages is closed by a sealing plate, which is soldered on during soldering of the heat exchanger block.
  • the sealing plates extend over the ends of several passage, the sealing plates preferably have formed in them a passageway which makes possible a fluid connection between the passages.
  • This passageway may be made in the form of an elongated recess which extends over the ends of the passages present in the flat tube.
  • FIG. 1 shows a greatly simplified diagram of an exemplary embodiment of the device claimed for the invention in the form of an air/fluid cooler
  • FIG. 2 a diagrammatic outline designed exclusively to clarify the fluid flow in the exemplary embodiment and illustrating the bypass mechanism of the exemplary embodiment comprising associated pressure control mechanisms;
  • FIG. 3 a section of a two-pass flat tube of the bypass mechanism of the flat tube corresponding to section III/III in FIG. 1 ;
  • FIG. 4 a top view of the interior of a sealing plate for closing of the flat tube shown in FIG. 3 on the end side.
  • FIG. 1 which presents a greatly simplified diagram of an exemplary embodiment of the device claimed for the invention in the form of an air/fluid cooler configured by unit construction
  • an inlet chamber for delivery of the fluid to be cooled and a outlet chamber for removal of the fluid are identified as 1 and 3 respectively.
  • the heat exchanger block has alternating plate-shaped superposed heat exchange elements, specifically, fluid guide elements 5 having internal fluid paths 7 along which the fluid to be cooled flows from the inlet chamber 1 to the outlet chamber 3 , and lattice elements 8 which form paths of flow for the cooling air which flows through and sweeps over the cooling blades of the lattice elements 8 .
  • the fluid guide elements 5 and the lattice elements 8 are plate-like structural members square or rectangular in outline.
  • This cover plate 9 forms a bypass mechanism for fluid connection between inlet chamber 1 and outlet chamber 3 bypassing the fluid paths 7 in the fluid guide elements 5 ; see the double directional arrows in FIGS. 1 and 2 , these arrows illustrating the influx of the fluid from the inlet chamber 1 into the cover plate 9 and flow of the fluid from the cover plate 9 into the outlet chamber 3 by way of spring-loaded spherical return valves 11 .
  • the return valves 11 normally closed by spring loading, make up a pressure control mechanism which permits through flow of fluid when the differential pressure between inlet chamber 1 and outlet chamber 3 exceeds a threshold value preselected by adjustment of the force of the valve spring. Only one return valve 11 is shown in FIG. 1 . However, with the aim of obtaining a valve passage cross-section of the size desired, several return valves 11 in succession are provided in the present exemplary embodiment. As is to be seen, FIG. 2 , which, unlike FIG. 1 , presents a vertical view, indicates the flow of fluid formed by the bypass mechanism through the return valves 11 , that is, into the outlet chamber 3 .
  • the cover plate 9 is formed by a section of an extruded hollow cast element in the form of a flat tube which in the present example is a two-pass tube, that is, one which has two interior passages 13 .
  • Each of the two ends of the flat tube forming the cover plate 9 is closed by a sealing plate 15 , which is shown in greater detail in FIG. 4 .
  • Through bores in the wall of the flat tube forming the cover plate 9 form the fluid connection between inlet chamber 1 and the interior passages 13 and the fluid connection of the passages 13 to the outlet chamber 3 .
  • the through bores associated with the inlet chamber 1 are designated as 17 .
  • two through bores 17 are provided at the inlet chamber 1 and two through bores 19 at the outlet chamber 3 .
  • a return valve 11 is mounted in each through bore 19 , in order, as has been indicated in the foregoing, to obtain a sufficiently large valve passage cross-section without the need for using excessively large valves.
  • the sealing plates 15 are provided with a recessed oblong groove 21 .
  • the groove 21 extends over the ends of the two passages 13 , as is shown by comparison of FIGS. 3 and 4 , as a result of which a passageway is formed which effects fluid connection between the passages 13 at the two ends of these passages.
  • access bores 23 are made in the wall of the flat tube forming the wall of the cover plate 9 , which bores 23 are made opposite the respective return valve 11 ; see FIGS. 1 and 3 .
  • the access bores 23 may be closed off by a sealing component 25 which may be in the form of a screwed-in cover component or the like.
  • the respective pressure control mechanism 11 may also consist of a closing component actuated by means of pressure and/or temperature, such as one in the form of a temperature-dependent elastic element. If the medium to be chilled is cold, a correspondingly high pressure is built up in the device and the pressure control mechanism 11 performs the bypass function of freeing the cooler. If the temperature of the medium to be cooled then rises and the medium is accordingly fluid, the medium may then flow directly through the cooler and bypass the bypass function, the closing component closing the bypass at a higher temperature.
  • a closing element such as this may, for example, be appropriately produced from an elastic element.
  • the bypass device claimed for the invention may also be subsequently connected to existing coolers, since by preference the bypass device is of a height which corresponds to the structural height of a fluid channel 7 and a following blade channel 8 . Consequently, if the respective upper row of blades together with the fluid channel is removed from a cooling mechanism which has already been delivered, structural space is created for subsequent mounting of a bypass device of standardized height and welding it on, so that subsequent outfitting with the bypass devices is immediately possible without significant reduction in the cooling efficiency of the cooling device as thus converted.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US10/518,230 2002-07-04 2003-05-02 Device for heat exchange between flowable media Abandoned US20060032626A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10230042A DE10230042A1 (de) 2002-07-04 2002-07-04 Vorrichtung zum Wärmeaustausch zwischen strömungfähigen Medien
DE102300429 2002-07-04
PCT/EP2003/004605 WO2004005832A1 (de) 2002-07-04 2003-05-02 Vorrichtung zum wärmeaustausch zwischen strömungsfähigen medien

Publications (1)

Publication Number Publication Date
US20060032626A1 true US20060032626A1 (en) 2006-02-16

Family

ID=29761615

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/518,230 Abandoned US20060032626A1 (en) 2002-07-04 2003-05-02 Device for heat exchange between flowable media

Country Status (8)

Country Link
US (1) US20060032626A1 (de)
EP (1) EP1520148B1 (de)
JP (1) JP2006506597A (de)
CN (1) CN100416213C (de)
AT (1) ATE331200T1 (de)
DE (2) DE10230042A1 (de)
ES (1) ES2266821T3 (de)
WO (1) WO2004005832A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090236088A1 (en) * 2008-03-24 2009-09-24 General Electric Company Heat Exchanger with Multiple Internal Diverters
US20100252242A1 (en) * 2009-04-07 2010-10-07 Lu Xiangxun Micro-channel heat exchanger
US20110259548A1 (en) * 2008-10-27 2011-10-27 Edc Automotive, Llc Heat exchanger and related method of manufacture
US20120206879A1 (en) * 2009-12-01 2012-08-16 Roland Herber Cooling device
US8267162B1 (en) 2008-09-16 2012-09-18 Standard Motor Products Bi-directional pressure relief valve for a plate fin heat exchanger
US20130327287A1 (en) * 2012-06-11 2013-12-12 Hyundai Motor Company Heat exchanger for vehicle
US20140245735A1 (en) * 2013-03-04 2014-09-04 Ford Global Technologies, Llc Charge-air intercooler system with integrated heating device
CN113983852A (zh) * 2021-11-04 2022-01-28 浙江银轮机械股份有限公司 换热器壳体结构及换热器
US11287197B2 (en) * 2019-04-05 2022-03-29 Dana Canada Corporation Heat exchanger assembly with integrated valve and pressure bypass

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1557630A1 (de) * 2004-01-23 2005-07-27 BEHR Lorraine S.A.R.L. Wärmeübertrager
CN102192665A (zh) * 2010-03-12 2011-09-21 无锡迈鑫科技实业有限公司 带压力-温度控制阀的板翅式换热器
DE202010011010U1 (de) * 2010-08-04 2010-11-04 Bucyrus Hex Gmbh Hydraulische Vorwärmeeinrichtung für Hydraulikölkühler in einem Großhydraulikbagger
CN102818066A (zh) * 2012-08-30 2012-12-12 无锡迈鑫科技实业有限公司 流量控制阀
KR101777482B1 (ko) * 2015-12-29 2017-09-12 서진욱 안전장치가 구비된 판형 열교환기

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578805A (en) * 1922-11-10 1926-03-30 Mccord Radiator & Mfg Co Thermostaf for radiators
US1865877A (en) * 1927-09-22 1932-07-05 Gen Motors Res Corp Cooling device
US3034770A (en) * 1959-09-16 1962-05-15 Continental Aviat & Eng Corp Heat exchanger
US4432410A (en) * 1980-05-05 1984-02-21 Valeo Heat exchanger, in particular for a cooling circuit of a motor vehicle engine
US5305826A (en) * 1991-02-26 1994-04-26 Valeo Thermique Moteur Motor vehicle radiator having a fluid flow control device
US5555930A (en) * 1994-06-24 1996-09-17 Behr Heat Transfer, Inc. Heat exchanger assembly with structural side passageways
US5950715A (en) * 1995-06-16 1999-09-14 Alfa Laval Ab Plate heat exchanger
US6527046B1 (en) * 1999-06-02 2003-03-04 Akg Of America, Inc. Heat exchanger, particularly oil cooler
US6997143B2 (en) * 2003-12-12 2006-02-14 Visteon Global Technologies, Inc. Integrated heat exchange and fluid control device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106963A1 (de) * 1991-03-05 1992-09-10 Rahmer & Jansen Gmbh Kuehlvorrichtung fuer fluide medien
DE4232366A1 (de) * 1991-07-11 1994-03-31 Laengerer & Reich Gmbh & Co Ölkühler
DE4402332C1 (de) * 1994-01-27 1995-04-06 Wesumat Gmbh Fahrzeug-Trocknungs- oder Poliervorrichtung
CN2237828Y (zh) * 1995-06-27 1996-10-16 天津市换热设备厂 带有旁通装置的板式换热器
US5666807A (en) 1995-12-13 1997-09-16 Caterpillar Inc. Oil processor circuit
WO2001031264A2 (en) * 1999-10-26 2001-05-03 Duramax Marine, Llc Heat exchanger with beveled header

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578805A (en) * 1922-11-10 1926-03-30 Mccord Radiator & Mfg Co Thermostaf for radiators
US1865877A (en) * 1927-09-22 1932-07-05 Gen Motors Res Corp Cooling device
US3034770A (en) * 1959-09-16 1962-05-15 Continental Aviat & Eng Corp Heat exchanger
US4432410A (en) * 1980-05-05 1984-02-21 Valeo Heat exchanger, in particular for a cooling circuit of a motor vehicle engine
US5305826A (en) * 1991-02-26 1994-04-26 Valeo Thermique Moteur Motor vehicle radiator having a fluid flow control device
US5555930A (en) * 1994-06-24 1996-09-17 Behr Heat Transfer, Inc. Heat exchanger assembly with structural side passageways
US5950715A (en) * 1995-06-16 1999-09-14 Alfa Laval Ab Plate heat exchanger
US6527046B1 (en) * 1999-06-02 2003-03-04 Akg Of America, Inc. Heat exchanger, particularly oil cooler
US6997143B2 (en) * 2003-12-12 2006-02-14 Visteon Global Technologies, Inc. Integrated heat exchange and fluid control device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090236088A1 (en) * 2008-03-24 2009-09-24 General Electric Company Heat Exchanger with Multiple Internal Diverters
US8267162B1 (en) 2008-09-16 2012-09-18 Standard Motor Products Bi-directional pressure relief valve for a plate fin heat exchanger
US20110259548A1 (en) * 2008-10-27 2011-10-27 Edc Automotive, Llc Heat exchanger and related method of manufacture
US8826971B2 (en) 2009-04-07 2014-09-09 Danfoss Sanhua (Hangzhou) Micro Micro-channel heat exchanger
US20100252242A1 (en) * 2009-04-07 2010-10-07 Lu Xiangxun Micro-channel heat exchanger
US9036349B2 (en) * 2009-12-01 2015-05-19 Hydac Cooling Gmbh Cooling device
US20120206879A1 (en) * 2009-12-01 2012-08-16 Roland Herber Cooling device
US20130327287A1 (en) * 2012-06-11 2013-12-12 Hyundai Motor Company Heat exchanger for vehicle
US8839748B2 (en) * 2012-06-11 2014-09-23 Hyundai Motor Company Heat exchanger for vehicle
US20140245735A1 (en) * 2013-03-04 2014-09-04 Ford Global Technologies, Llc Charge-air intercooler system with integrated heating device
US9739194B2 (en) * 2013-03-04 2017-08-22 Ford Global Technologies, Llc Charge-air intercooler system with integrated heating device
US11287197B2 (en) * 2019-04-05 2022-03-29 Dana Canada Corporation Heat exchanger assembly with integrated valve and pressure bypass
CN113983852A (zh) * 2021-11-04 2022-01-28 浙江银轮机械股份有限公司 换热器壳体结构及换热器

Also Published As

Publication number Publication date
CN100416213C (zh) 2008-09-03
ATE331200T1 (de) 2006-07-15
EP1520148B1 (de) 2006-06-21
CN1666080A (zh) 2005-09-07
ES2266821T3 (es) 2007-03-01
DE10230042A1 (de) 2004-01-22
JP2006506597A (ja) 2006-02-23
DE50303971D1 (de) 2006-08-03
WO2004005832A1 (de) 2004-01-15
EP1520148A1 (de) 2005-04-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HYDAC S.A., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KEEN, MARK GRAEME;REEL/FRAME:016988/0961

Effective date: 20050103

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION