SI1963771T1 - Plošča za prenos toplote ploščnega toplotnega izmenjevalnika, ki zagotavlja enako porazdelitev bremena v priključnih območjih - Google Patents

Plošča za prenos toplote ploščnega toplotnega izmenjevalnika, ki zagotavlja enako porazdelitev bremena v priključnih območjih

Info

Publication number
SI1963771T1
SI1963771T1 SI200632342T SI200632342T SI1963771T1 SI 1963771 T1 SI1963771 T1 SI 1963771T1 SI 200632342 T SI200632342 T SI 200632342T SI 200632342 T SI200632342 T SI 200632342T SI 1963771 T1 SI1963771 T1 SI 1963771T1
Authority
SI
Slovenia
Prior art keywords
plate
load distribution
heat exchanger
even load
heat transfer
Prior art date
Application number
SI200632342T
Other languages
English (en)
Slovenian (sl)
Inventor
Hakan Larsson
Thord Gudmundsson
Kerstin Drakarve
Original Assignee
Alfa Laval Corp Ab
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 Alfa Laval Corp Ab filed Critical Alfa Laval Corp Ab
Publication of SI1963771T1 publication Critical patent/SI1963771T1/sl

Links

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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates

Landscapes

  • 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)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
SI200632342T 2005-12-22 2006-12-21 Plošča za prenos toplote ploščnega toplotnega izmenjevalnika, ki zagotavlja enako porazdelitev bremena v priključnih območjih SI1963771T1 (sl)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0502877A SE531472C2 (sv) 2005-12-22 2005-12-22 Värmeväxlare med värmeöverföringsplatta med jämn lastfördelning på kontaktpunkter vid portområden
PCT/SE2006/001469 WO2007073304A1 (en) 2005-12-22 2006-12-21 Heat transfer plate for plate heat exchanger with even load distribution in port regions
EP06835884.5A EP1963771B1 (en) 2005-12-22 2006-12-21 Heat transfer plate for plate heat exchanger with even load distribution in port regions

Publications (1)

Publication Number Publication Date
SI1963771T1 true SI1963771T1 (sl) 2019-10-30

Family

ID=38188934

Family Applications (2)

Application Number Title Priority Date Filing Date
SI200632274T SI1963770T1 (sl) 2005-12-22 2006-12-21 Sredstva ploščnega toplotnega izmenjevalnika
SI200632342T SI1963771T1 (sl) 2005-12-22 2006-12-21 Plošča za prenos toplote ploščnega toplotnega izmenjevalnika, ki zagotavlja enako porazdelitev bremena v priključnih območjih

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SI200632274T SI1963770T1 (sl) 2005-12-22 2006-12-21 Sredstva ploščnega toplotnega izmenjevalnika

Country Status (14)

Country Link
US (2) US20090008073A1 (enExample)
EP (2) EP1963770B1 (enExample)
JP (2) JP5037524B2 (enExample)
KR (2) KR101300946B1 (enExample)
CN (2) CN101346598B (enExample)
AU (2) AU2006327322B2 (enExample)
BR (2) BRPI0620443A2 (enExample)
CA (2) CA2634314C (enExample)
DK (2) DK1963771T3 (enExample)
ES (2) ES2687198T3 (enExample)
RU (2) RU2413916C2 (enExample)
SE (1) SE531472C2 (enExample)
SI (2) SI1963770T1 (enExample)
WO (2) WO2007073304A1 (enExample)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533310C2 (sv) * 2008-11-12 2010-08-24 Alfa Laval Corp Ab Värmeväxlarplatta och värmeväxlare innefattande värmeväxlarplattor
SE533205C2 (sv) 2008-12-03 2010-07-20 Alfa Laval Corp Ab Värmeväxlare
DE102009058676A1 (de) * 2009-12-16 2011-06-22 Behr GmbH & Co. KG, 70469 Wärmetauscher
WO2012143998A1 (ja) * 2011-04-18 2012-10-26 三菱電機株式会社 プレート式熱交換器及びヒートポンプ装置
WO2013008320A1 (ja) * 2011-07-13 2013-01-17 三菱電機株式会社 プレート式熱交換器及びヒートポンプ装置
ES2749507T3 (es) * 2012-06-14 2020-03-20 Alfa Laval Corp Ab Un intercambiador de calor de placas con medios de inyección
US20150034285A1 (en) * 2013-08-01 2015-02-05 Hamilton Sundstrand Corporation High-pressure plate heat exchanger
KR102277174B1 (ko) * 2013-10-29 2021-07-14 스웹 인터네셔널 에이비이 스크린 프린티드 브레이징재를 이용한 판형 열교환기 브레이징 방법 및 그 방법으로 제조된 판형 열교환기
JP6552499B2 (ja) * 2013-12-10 2019-07-31 スウェップ インターナショナル アクティエボラーグ 改良された流れを有する熱交換器
SI3078929T1 (en) * 2015-04-07 2018-04-30 Alfa Laval Corporate Ab A process for producing a plate heat exchanger
SI3093602T1 (sl) 2015-05-11 2020-08-31 Alfa Laval Corporate Ab Plošča toplotnega izmenjevalnika in ploščni toplotni izmenjevalnik
EP3527320B1 (en) * 2016-03-31 2020-12-23 Alfa Laval Corporate AB Method for joining heat transfer plates of a plate heat exchanger
US20180100706A1 (en) * 2016-10-11 2018-04-12 Climate Master, Inc. Enhanced heat exchanger
EP3800422B1 (en) 2017-03-10 2023-10-25 Alfa Laval Corporate AB Plate for a heat exchanger device
EP3396293A1 (en) * 2017-04-26 2018-10-31 Alfa Laval Corporate AB Heat transfer plate and heat exchanger comprising a plurality of such heat transfer plates
DE112018004787T5 (de) 2017-08-31 2020-06-25 Dana Canada Corporation Multi-fluid wärmetauscher
JP7001413B2 (ja) * 2017-09-28 2022-01-19 株式会社日阪製作所 プレート式熱交換器
PT3467423T (pt) * 2017-10-05 2020-09-01 Alfa Laval Corp Ab Placa de transferência de calor e um bloco de placas para um permutador de calor que compreende uma pluralidade das ditas placas de transferência de calor
ES2842329T3 (es) 2018-06-28 2021-07-13 Alfa Laval Corp Ab Placa de transferencia de calor y junta
SE544426C2 (en) * 2019-04-03 2022-05-24 Alfa Laval Corp Ab A heat exchanger plate, and a plate heat exchanger
SE544093C2 (en) * 2019-05-21 2021-12-21 Alfa Laval Corp Ab Plate heat exchanger, and a method of manufacturing a plate heat exchanger
EP3828489A1 (en) 2019-11-26 2021-06-02 Alfa Laval Corporate AB Heat transfer plate
CN110779361B (zh) * 2019-11-29 2025-01-24 江苏唯益换热器有限公司 一种具有八字形分配通道的钎焊换热板片组
CN110749214A (zh) * 2019-12-06 2020-02-04 江苏唯益换热器有限公司 一种可提高流通均匀性的钎焊换热器板片组
CN110749215A (zh) * 2019-12-06 2020-02-04 江苏唯益换热器有限公司 一种多级分流的钎焊换热器板片组
SE544387C2 (en) 2019-12-23 2022-05-03 Swep Int Ab A heat exchanger with indentations for avoiding stagnant media
CN112414182B (zh) * 2020-04-01 2025-09-12 浙江三花智能控制股份有限公司 板式换热器
RS67070B1 (sr) 2022-12-26 2025-08-29 Euro Heat Doo Izmenjivač toplote sa zavarenim unutrašnjim izmenjivačkim pločama
CN117288008B (zh) * 2023-09-15 2025-10-28 珠海格力电器股份有限公司 一种换热微元、换热板及板式换热器

Family Cites Families (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US55149A (en) 1866-05-29 Improvement in surface-condensers
US1826344A (en) * 1930-09-23 1931-10-06 Res & Dev Corp Heat exchange element
DE1601216B2 (de) * 1967-11-03 1971-06-16 Linde Ag, 6200 Wiesbaden Blechtafel fuer platten waermetauscher mit einem stapel solcher blechtafeln
US3537165A (en) * 1968-06-26 1970-11-03 Air Preheater Method of making a plate-type heat exchanger
US3661203A (en) * 1969-11-21 1972-05-09 Parkson Corp Plates for directing the flow of fluids
GB1298240A (en) 1970-10-21 1972-11-29 Apv Co Ltd Improvements in or relating to plate heat exchangers
IT1055235B (it) * 1976-02-12 1981-12-21 Fischer H Scambiatore di calore a piastre formato da piastre aventi forme diverse
SE7601607L (sv) * 1976-02-12 1977-08-13 Atomenergi Ab Plattvermevexlare
SE423750B (sv) * 1977-01-14 1982-05-24 Munters Ab Carl Anordning vid vermevexlare for sensibel och/eller latent vermeoverforing
SE415928B (sv) * 1979-01-17 1980-11-10 Alfa Laval Ab Plattvermevexlare
US4249597A (en) * 1979-05-07 1981-02-10 General Motors Corporation Plate type heat exchanger
SE431793B (sv) * 1980-01-09 1984-02-27 Alfa Laval Ab Plattvermevexlare med korrugerade plattor
US4442886A (en) * 1982-04-19 1984-04-17 North Atlantic Technologies, Inc. Floating plate heat exchanger
JPS59195389U (ja) * 1983-06-07 1984-12-25 東洋ラジエーター株式会社 熱交換器の放熱体
DE3622316C1 (de) * 1986-07-03 1988-01-28 Schmidt W Gmbh Co Kg Plattenwaermeaustauscher
SE455883B (sv) * 1987-02-27 1988-08-15 Svenska Rotor Maskiner Ab Sats av vermeoverforingsplatar, der platarnas dubbelasar har en specifik inbordes orientering
SU1511573A1 (ru) * 1988-01-19 1989-09-30 Челябинское Ремонтно-Монтажное Специализированное Управление Треста "Союзцветметгазоочистка" Коллектор теплообменника
JPH0326231A (ja) * 1989-06-23 1991-02-04 Fukuda Denshi Co Ltd レコーダ制御方法
US5056590A (en) * 1990-03-30 1991-10-15 The Cherry-Burrell Corporation Plate heat exchanger
RU2008602C1 (ru) * 1990-10-22 1994-02-28 Государственное производственное объединение "Воткинский завод" Пластина теплообменника
SE505225C2 (sv) * 1993-02-19 1997-07-21 Alfa Laval Thermal Ab Plattvärmeväxlare och platta härför
IT1263611B (it) * 1993-02-19 1996-08-27 Giannoni Srl Scambiatore di calore a piastre
US5462113A (en) * 1994-06-20 1995-10-31 Flatplate, Inc. Three-circuit stacked plate heat exchanger
SE9502135D0 (sv) * 1995-06-13 1995-06-13 Tetra Laval Holdings & Finance Plattvärmeväxlare
SE504868C2 (sv) 1995-10-23 1997-05-20 Swep International Ab Plattvärmeväxlare med ändplatta med pressat mönster
JP3302869B2 (ja) * 1995-11-15 2002-07-15 株式会社荏原製作所 プレート式熱交換器及びその製造方法
SE9504586D0 (sv) * 1995-12-21 1995-12-21 Tetra Laval Holdings & Finance Plattvärmeväxlare
JP3026231U (ja) 1995-12-22 1996-07-02 東洋ラジエーター株式会社 オイルクーラ
US5964280A (en) 1996-07-16 1999-10-12 Modine Manufacturing Company Multiple fluid path plate heat exchanger
AT407920B (de) 1997-03-25 2001-07-25 Ktm Kuehler Gmbh Plattenwärmetauscher, insbesondere ölkühler
JP3292128B2 (ja) * 1998-02-27 2002-06-17 ダイキン工業株式会社 プレート型熱交換器
JPH11287582A (ja) * 1998-03-31 1999-10-19 Hisaka Works Ltd プレート式熱交換器
CA2260890A1 (en) 1999-02-05 2000-08-05 Long Manufacturing Ltd. Self-enclosing heat exchangers
DE19959780B4 (de) * 1999-04-12 2004-11-25 Rehberg, Peter, Dipl.-Ing. Plattenwärmeübertrager
FR2795167B1 (fr) * 1999-06-21 2001-09-14 Valeo Thermique Moteur Sa Echangeur de chaleur a plaques, notamment pour refroidir une huile d'un vehicule automobile
DE19948222C2 (de) * 1999-10-07 2002-11-07 Xcellsis Gmbh Plattenwärmetauscher
FR2803025B1 (fr) 1999-12-22 2002-05-03 Mer Joseph Le Echangeur thermique a plaques, a clapet de decharge integre
SE515467C2 (sv) 1999-12-23 2001-08-13 Alfa Laval Ab Plattvärmeväxlare med minst en platta försedd med ett trågformat parti för bildande av ett avtätat utrymme.
JP2001248996A (ja) * 2000-03-08 2001-09-14 Hitachi Ltd プレート式熱交換器
DE10024888B4 (de) 2000-05-16 2008-10-16 Gea Wtt Gmbh Plattenwärmeübertrager mit Kältemittelverteiler
JP3448265B2 (ja) * 2000-07-27 2003-09-22 昭 藤山 チタン製プレート式熱交換器の製造方法
JP2002081883A (ja) * 2000-09-08 2002-03-22 Hitachi Ltd プレート式熱交換器およびそれを用いた吸収式冷凍機
DE60137647D1 (de) * 2000-12-28 2009-03-26 Showa Denko Kk Wärmetauscher mit gestapelten platten
SE518248C2 (sv) * 2001-01-31 2002-09-17 Alfa Laval Ab Plattvärmeväxlare
CN2554586Y (zh) * 2002-07-29 2003-06-04 北京海淀永大机电设备制造有限责任公司 大截面板式换热器
DE10304733A1 (de) * 2003-02-06 2004-08-19 Modine Manufacturing Co., Racine Plattenwärmetauscher
JP2005009828A (ja) * 2003-06-20 2005-01-13 Calsonic Kansei Corp 熱交換器
WO2005012820A1 (de) * 2003-08-01 2005-02-10 Behr Gmbh & Co. Kg Wärmeübertrager sowie verfahren zu dessen herstellung
JP4210185B2 (ja) 2003-09-05 2009-01-14 スズキ株式会社 シートベルト装置
DE102004003790A1 (de) * 2004-01-23 2005-08-11 Behr Gmbh & Co. Kg Wärmetauscher, insbesondere Öl-/Kühlmittel-Kühler
EP1725824B1 (de) * 2004-03-11 2015-12-02 MAHLE Behr GmbH & Co. KG Stapelscheiben-wärmetauscher
SE526831C2 (sv) * 2004-03-12 2005-11-08 Alfa Laval Corp Ab Värmeväxlarplatta och plattpaket
JP2005291671A (ja) * 2004-04-05 2005-10-20 Calsonic Kansei Corp 積層型熱交換器
SE527716C2 (sv) * 2004-04-08 2006-05-23 Swep Int Ab Plattvärmeväxlare
SE528275C2 (sv) * 2005-02-15 2006-10-10 Alfa Laval Corp Ab Värmeöverföringsplatta med styrorgan samt värmeväxlare som innefattar sådana plattor
SE528886C2 (sv) * 2005-08-26 2007-03-06 Swep Int Ab Ändplatta
SE530011C2 (sv) * 2006-06-05 2008-02-05 Alfa Laval Corp Ab Värmeväxlarplatta och plattvärmeväxlare
EP2054679A4 (en) * 2006-08-23 2013-01-23 Alfa Laval Corp Ab HEAT EXCHANGER WITH PLATES AND HEAT EXCHANGER INSTALLATION

Also Published As

Publication number Publication date
AU2006327321A1 (en) 2007-06-28
AU2006327322B2 (en) 2012-02-02
DK1963770T3 (en) 2018-11-05
DK1963771T3 (da) 2019-10-14
JP2009521658A (ja) 2009-06-04
US20090008073A1 (en) 2009-01-08
KR20080089423A (ko) 2008-10-06
CN101346597A (zh) 2009-01-14
RU2411436C2 (ru) 2011-02-10
BRPI0619643A2 (pt) 2012-12-11
AU2006327322A1 (en) 2007-06-28
US20090178793A1 (en) 2009-07-16
CN101346597B (zh) 2010-10-06
JP4981063B2 (ja) 2012-07-18
ES2744813T3 (es) 2020-02-26
JP5037524B2 (ja) 2012-09-26
EP1963770B1 (en) 2018-07-18
RU2008130127A (ru) 2010-01-27
EP1963771A4 (en) 2013-05-29
SI1963770T1 (sl) 2018-10-30
ES2687198T3 (es) 2018-10-24
EP1963770A4 (en) 2013-05-22
EP1963771A1 (en) 2008-09-03
SE531472C2 (sv) 2009-04-14
CA2634314A1 (en) 2007-06-28
CN101346598A (zh) 2009-01-14
EP1963770A1 (en) 2008-09-03
CA2634314C (en) 2014-02-18
KR101249174B1 (ko) 2013-04-02
WO2007073305A1 (en) 2007-06-28
BRPI0619643B1 (pt) 2018-10-16
KR101300946B1 (ko) 2013-08-27
JP2009521659A (ja) 2009-06-04
WO2007073304A1 (en) 2007-06-28
US8109326B2 (en) 2012-02-07
EP1963771B1 (en) 2019-07-10
RU2413916C2 (ru) 2011-03-10
CN101346598B (zh) 2012-07-11
AU2006327321B2 (en) 2011-01-20
RU2008130129A (ru) 2010-01-27
BRPI0620443A2 (pt) 2013-01-15
KR20080087124A (ko) 2008-09-30
CA2634318A1 (en) 2007-06-28
SE0502877L (sv) 2007-06-23

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