EP0624771A1 - Tube plat pour un échangeur de chaleur - Google Patents

Tube plat pour un échangeur de chaleur Download PDF

Info

Publication number: EP0624771A1
Authority: EP; European Patent Office
Prior art keywords: flat tube; tube according; wave; wire; tubular body
Prior art date: 1993-05-13
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

EP94102940A

Other languages

German (de)

English (en)

Other versions

EP0624771B1 (fr

Inventor

Roland Dipl.-Ing. Strähle (FH)

Bernhard Dipl.-Ing. Stephan (Fh)

Manfred Dipl.-Ing. Rohrmus (Fh)

Gerhard Weiss

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.)

Laengerer and Reich GmbH and Co

Original Assignee

Laengerer and Reich GmbH and Co

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.)

1993-05-13

Filing date

1994-02-26

Publication date

1994-11-17

1994-02-26 Application filed by Laengerer and Reich GmbH and Co filed Critical Laengerer and Reich GmbH and Co

1994-11-17 Publication of EP0624771A1 publication Critical patent/EP0624771A1/fr

1996-09-18 Application granted granted Critical

1996-09-18 Publication of EP0624771B1 publication Critical patent/EP0624771B1/fr

2014-02-26 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

Definitions

the invention relates to a flat tube for heat exchangers mentioned in the preamble of claim 1.
a flat tube of this type with an inner turbulence element is known (US Pat. No. 4,269,265), which - viewed in cross section of the flat tube - bears on the inside of both end sections lying at the end of the larger longitudinal axis with an arc adapted to it and approximately in a line. From these end-side arc regions of the wire in each case go off middle sections which extend approximately diagonally through the interior of the tubular body and thereby from one end region to the other end region at the respective end of the larger longitudinal axis. In cross-section, the wire thus has a profile that roughly corresponds to the contour of an air screw or the like wing.
a flat tube with such a turbulence element has the disadvantage that the turbulence element occupies a relatively large internal cross-section of the tube body, and the wire cross-sections of the turbulence element considerably reduce the interior space remaining for the flow through the tube body. The result is a reduced cross-section of the flat tube which can be flowed through, which results in a lower heat transfer performance.
such a turbulence element requires a relatively large amount of material, has a relatively large weight and that its shaping is complex, in particular requires a relatively complex device and requires a relatively large amount of time.
a certain part of a turbulence element designed in this way does not participate, or participates only slightly, in converting the laminar core flow in the tubular body into a turbulent flow.
the relatively large area there, which takes place with line contact, has the further disadvantage that the turbulence element can only be introduced into the interior of the tubular body by overcoming a relatively large amount of friction. This large friction considerably impedes the introduction of the turbulence element and therefore requires great forces for this. This also leads to considerable assembly effort.
the turbulence element is therefore not securely fixed. It can slide and shake.
the turbulence element has both ends and is therefore supported on the tubular body with a large support length between both ends. Under the action of the medium flowing through, the wire is thus bent relatively easily along the length between both ends, as a result of which the ends of the can lift each end portion of the tubular body and thus thereby loosening the mounting of the turbulence element in the tubular body. Overall, there is a high risk that the wire will be lifted from the inside of the tubular body at the points of contact and thereby cause friction with associated wear, vibrations and disturbing noises.
the invention has for its object to provide a flat tube for heat exchangers of the type mentioned, which eliminates the disadvantages mentioned, in particular has a light, inexpensive, easy to manufacture and easily insertable into the tubular body, with only a small inside the tubular body Part of the wire cross section of the turbulence element is occupied and the pipe cross section through which flow can be reduced is only insignificantly.
the turbulence element is nevertheless securely fixed guaranteed in the tubular body. This prevents wear, vibrations and noises.
the turbulence element has a simple shape, which can be obtained quickly and easily by appropriate bending. Furthermore, this turbulence element requires relatively little wire, which reduces the weight and the cost of this. An improvement in the heat transfer performance of the flat tube is thus achieved by means of the wire, which is simple to manufacture and insertable.
a wire with a round cross section is particularly favorable because of the point contact that can be achieved, so that such a turbulence element is particularly resistant to deformation and noise.
the turbulence element can be held non-positively and / or positively in the tubular body.
the areas producing turbulence are only located where the heat transfer between the medium and the tubular body is unfavorable and is improved by the turbulence generated.
Welded tubular bodies can also be used without disadvantages.
the support length of the wire measured between the support points in contact with the tubular body is relatively small, so that hardly any deflections or the like. Deformations are to be feared under the action of the medium and also a firm hold of the turbulence element in the tubular body is ensured. Overall, the turbulence element is stable in deformation, low-wear and noise-free.
the features in claims 22 to 24 provide additional positive locking of the turbulence element if required.
a flat tube 10 for a heat exchanger is shown schematically, the z. B. as a cooler, especially water cooler, for internal combustion engines od. Like. Or instead z. B. also as intercooler, oil cooler or the like. or can also be used as a radiator, condenser or the like.
a heat exchanger, in particular a water cooler, which is equipped with such flat tubes 10, is generally known (DE 32 22 278 C3, EP 0 387 678 A1) and therefore does not require any special explanation here.
the flat tube 10 has a tubular body which has an oval, for. B. elliptical, cross section. In another embodiment, not shown, the tubular body has a rectangular cross section with rounded end regions. Due to this oval cross-sectional shape, the tubular body has a larger longitudinal axis 11 and a smaller longitudinal axis 12, which runs approximately at right angles thereto, which intersect in the center and in the region of the longitudinal central axis 13 of the flat tube 10.
the flat tube 10 has two approximately opposite, in each case convexly curved broad surfaces 14 and 15, which at the respective end of the larger longitudinal axis 11 merge into end regions 16 and 17 there, which are curved with a smaller radius of curvature.
the flat tube 10 can, as shown, be a one-piece tube.
the flat tube 10 consists of metal, for. B. copper or in particular aluminum. Like. Material with high thermal conductivity.
the wall thickness s of the flat tube 10 is, for. B. low and constant all around.
At least one turbulence element 20 is inserted into the flat tube 10 and is held in the flat tube 10 by its own spring force.
the turbulence element 20 is made of a longitudinally e.g. approximately sinusoidally corrugated wire 21 formed from almost any material, especially metal, e.g. made of copper or in particular aluminum or the like.
the wire 21 can have an angular, e.g. quadrangular, rectangular or otherwise flat cross-section or in particular, as shown, a round cross-section, which is particularly advantageous because the turbulence element is particularly resistant to deformation and noise.
the wire 21 which is corrugated in its longitudinal direction has wave crests 22 and wave troughs 23 which alternate with one another in the longitudinal direction.
the corrugated wire 21 In the state of the turbulence element which is introduced, in particular drawn, into the flat tube 10 20, in particular the corrugated wire 21, at least some wave crests 22 or troughs 23 can be in contact with the inside 18 of the flat tube 10.
the turbulence element 20, in particular the corrugated wire 21, has central sections 24 which extend between the wave crests 22 and wave troughs 23 and which are all contained within a common plane 25, as can be seen in particular from FIG. 3.
the wave crests 22, which adjoin the central sections 24 on one side, are bent to one side at an obtuse angle ⁇ 1 with respect to the plane 25 of the central sections 24.
the wave troughs 23 which adjoin the central sections 24 on the other side are also at an obtuse angle ⁇ 2 with respect to that Level 25 of the middle sections 24 is bent toward the opposite side.
bent wave troughs 23, viewed in the longitudinal direction of the turbulence element 20, likewise run within a common plane 27.
the bending angle ⁇ 1 of the wave crests 22 can be at least substantially equal to the bending angle ⁇ 2 of the wave troughs 23.
3 shows clearly that the wave crests 22, starting from the plane 25, are cranked to one side of this plane 25 and the wave troughs 23 to the opposite, other side of this plane 25.
the planes 26 and 27 can run approximately parallel to one another.
the plane 25, in which the central sections 24 extend, runs between the two other planes 26 and 27 at an angle corresponding to the angle of deflection ⁇ 1, ⁇ 2.
the distance a which the level 26 has from the level 27, z. B. be relatively small.
the distance t of a wave crest 22 to the next wave crest or a wave trough 23 to the next wave trough, consequently the division, can be a multiple of a .
the width h measured from the already cropped tip of a wave crest 22 to the already cropped depth of a wave trough 23 within the plane 25 is usually less than t .
the respective angle ⁇ , at which two adjacent legs of a central section 24 extend to one another, can be less than or greater than 90 °.
the turbulence element 20, in particular the wire 21, is already shown in the finished bent state, so that the wire 21 can be introduced, in particular drawn, into the flat tube 10 in this state.
This retracted state is shown in FIGS. 1 and 2.
the wire 21 - viewed in cross section of the flat tube 10 - is held in an approximately Z-shaped manner in the flat tube 10, the central section 24 being a central strut Wave crest 22 which forms a crosshead and a trough 23 forms the other crosshead of the Z , which extends from the respective end of the central strut 24.
this Z can be recognized as an approximately lying Z due to the spatial arrangement of the flat tube 10.
the respective cranked wave crest 22 in the flat tube 10 extends with a slope from the inside 18 of the one broad surface 14 approximately to the inside 18 of the opposite broad surface 15.
This cranked wave crest 22 is located in the inner region located on the left of the smaller longitudinal axis 12 in FIG. 2.
the respective cranked wave trough 23 extends in an analogous manner in the flat tube 10 with a slope from the inside 18 of one wide surface 14 approximately to the inside 18 of the opposite wide surface 15, the respective cranked wave trough 23 being located in the inner region of the flat tube 10 to the right of the longitudinal axis 12 extends.
the larger longitudinal axis 11 of the flat tube 10, viewed in cross section according to FIG. 2, is crossed by the obliquely extending central section 24, which extends with a slope from the inside 18 of the one broad area 14 approximately to the inside 18 of the opposite broad area 15 and the extends from the smaller longitudinal axis 12 in Fig. 2 both to the left and to the right.
the central section 24 extends at an acute angle to the longitudinal axis 11, the respective step angle between the smaller longitudinal axis 12 and this central section 24 also being an acute angle.
the larger longitudinal axis 11 is also crossed by the wave crest 22 and wave trough 23 which run obliquely to the central section 24.
the respective peaks of both the wave crests 22 and the wave troughs 23 are preferably rounded. 1 and 2, the turbulence element 20, in particular the wire 21, with the tips of the wave crests 22 and / or the wave troughs 23 and / or - per leg of the central sections 24 in between - with there bend points 28, 29 in essential point contact with the inside 18 of the flat tube 10, in particular with the wide surfaces 14, 15.
the arrangement can be such that the tips of all wave crests 22 and all wave troughs 23 and all bends 28, 29 with the inside 18 of the flat tube 10 in point contact.
the explained respective point contact of the wire 21 on the inside 18 of the flat tube 10 is sufficient to ensure a secure clamping fixation of the turbulence element 20 in the interior of the flat tube 10 and to prevent the turbulence element 20 from being washed out under the effect of the medium flowing through.
the tensile force z. B. can be on the order of only about 300 g.
Such a tensile force is already sufficient to pull the wire 21 into the interior of the flat tube 10 and to maintain the slight deformation of the wire 21, in particular in the longitudinal direction, and to generate the pretension under which the wire 21 is clamped essentially resiliently in the flat tube 10 is held.
the wire 21 is held in the flat tube 10 with sufficient pretension, which ensures frictional adhesion and protection against the turbulence element 20 being flushed out when it touches the point.
the flat tube 10 of the type described is considerably improved in terms of heat transfer performance by means of the explained turbulence element 20, the turbulence element 20 being simple to manufacture and easy to assemble.
the improvement of the heat transfer performance results from the fact that the turbulence element 20 breaks up the laminar core flow in the flat tube 10 and converts it into a turbulent flow. Since only a small part is occupied by the cross-section of the turbulence element 20, in particular the wire 21, in each tube cross-sectional area, the largest possible flow-through cross-section is nevertheless maintained.
the wire 21 is reliably fixed in the flat tube 10 by limited friction, this friction not hindering the assembly of the wire 21.
the effort for this special, highly effective turbulence element 20 is very low.
the turbulence element 20, in particular the wire is positively fixed at least at one point on the tubular body.
the turbulence element 20 can be fixed on the tubular body, for. B. soldered or welded.
the turbulence element 20, in particular the wire 21 can also have a bent section which is fixed to the tubular body in a form-fitting manner.
the bent section can e.g. B. striking the end of the tubular body on this. Instead, it can also be fixed in a slot, another opening in the wall of the tubular body or in another location of the latter.
the turbulence element 20, in particular the wire 21, is formed from a softer material than the tubular body. Then it is ensured that in the event of possible frictional wear of the turbulence element 20 due to internal movement in the tubular body, the latter has a longer service life.
the turbulence element 20, in particular the wire 21, is corrugated in the direction of its longitudinal extent within a vertical and / or horizontal plane.
the level corresponding to the vertical plane is e.g. B. in Fig. 3 identical to the plane 25 within which the central portions 24 extend.
the other horizontal plane is the one that is at least substantially perpendicular to plane 25.
the turbulence element 20 can thus not only be corrugated within the vertical plane 25 but instead or in addition to it also in the horizontal plane perpendicular to it.
all wave crests 22 are bent to one side and all wave troughs 23 are bent to the other side.
this is not mandatory.
at least some wave crests 22 are bent on one side and some wave troughs 23 on the other side.
This design implies one in which the undeflected crests 22 and troughs 23 e.g. run within the plane 25 of the central sections 24 or are also bent, but towards the other side, so that there is a configuration in which some wave crests 22 are bent to one side and some wave crests to the other side, as well as some wave troughs 23 to one side and some other troughs 23 are bent to the other side.
the wave crests 22 and the wave troughs 23 are each bent to one or the other side.
the wave crests 22 are alternately bent to one side and the other. This means that a wave crest 22 which is bent on one side is followed in the longitudinal direction by a wave crest 22 which is bent in the opposite direction to the other side. It goes without saying that two further wave crests 22, which are bent towards the other side, can also follow in the longitudinal direction on two wave crests 22 bent to one side.
the bends with regard to the troughs 23 can also be selected in the same way. E.g.
the troughs 23 can be bent alternately to one side and to the other, specifically one trough 23 per side or also several adjoining troughs 23.

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)
Wire Processing (AREA)

EP19940102940 1993-05-13 1994-02-26 Tube plat pour un échangeur de chaleur Expired - Lifetime EP0624771B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19934316020 DE4316020C1 (de)	1993-05-13	1993-05-13	Flachrohr für Wärmeaustauscher
DE4316020		1993-05-13

Publications (2)

Publication Number	Publication Date
EP0624771A1 true EP0624771A1 (fr)	1994-11-17
EP0624771B1 EP0624771B1 (fr)	1996-09-18

Family

ID=6487999

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19940102940 Expired - Lifetime EP0624771B1 (fr)	1993-05-13	1994-02-26	Tube plat pour un échangeur de chaleur

Country Status (2)

Country	Link
EP (1)	EP0624771B1 (fr)
DE (1)	DE4316020C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1413844A2 (fr)	2002-10-25	2004-04-28	Bayer Aktiengesellschaft	Canaux de contrôle de température

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT405880B (de) *	1998-03-05	1999-12-27	Vaillant Gmbh	Wärmetauscher
DE10326381B4 (de) *	2003-06-12	2005-09-22	Jähn, Peter	Turbulenzerzeuger
RU2700308C1 (ru) *	2018-10-22	2019-09-16	Федеральное государственное бюджетное образовательное учреждение высшего образования "Амурский государственный университет"	Котел с инжекторными газовыми горелками

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1501458A1 (de) *	1965-12-27	1969-10-30	American Radiator & Standard	Waermetauschvorrichtung
FR2238909A1 (en) *	1973-07-26	1975-02-21	Pertsev Leonid	Plate heat exchanger with turbulence producing inserts - of spiral entwined wires also serving as spacers
FR2512940A1 (fr) *	1981-09-14	1983-03-18	Sueddeutsche Kuehler Behr	Echangeur de chaleur a tubes de profil aplati a elements rapportes generateurs de turbulence

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4044796A (en) *	1976-02-09	1977-08-30	Smick Ronald H	Turbulator
US4269265A (en) *	1979-11-29	1981-05-26	Modine Manufacturing Company	Tubular heat exchanger with turbulator
DE3908266A1 (de) *	1989-03-14	1990-09-20	Autokuehler Gmbh & Co Kg	Waermeaustauscher und verfahren zur fluessigkeitsdichten befestigung einer bodenplatte an einem waermetauschernetz

1993
- 1993-05-13 DE DE19934316020 patent/DE4316020C1/de not_active Expired - Lifetime
1994
- 1994-02-26 EP EP19940102940 patent/EP0624771B1/fr not_active Expired - Lifetime

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1501458A1 (de) *	1965-12-27	1969-10-30	American Radiator & Standard	Waermetauschvorrichtung
FR2238909A1 (en) *	1973-07-26	1975-02-21	Pertsev Leonid	Plate heat exchanger with turbulence producing inserts - of spiral entwined wires also serving as spacers
FR2512940A1 (fr) *	1981-09-14	1983-03-18	Sueddeutsche Kuehler Behr	Echangeur de chaleur a tubes de profil aplati a elements rapportes generateurs de turbulence

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1413844A2 (fr)	2002-10-25	2004-04-28	Bayer Aktiengesellschaft	Canaux de contrôle de température
DE10249724B4 (de) *	2002-10-25	2005-03-17	Bayer Industry Services Gmbh & Co. Ohg	Hochleistungs-Temperierkanäle

Also Published As

Publication number	Publication date
DE4316020C1 (de)	1994-04-28
EP0624771B1 (fr)	1996-09-18

Publication	Publication Date	Title
DE2728971C3 (de)	1981-07-16	Einsatz für ein Wärmetauscherrohr
EP0305891B1 (fr)	1991-11-06	Elément de conduite pour systèmes de gaz d'échappement
WO1989004447A1 (fr)	1989-05-18	Tube echangeur de chaleur
DE2606479B2 (de)	1979-06-13	Störflächen zum Unterdrücken der Eigenschwingungen angeströmter Zylinder
EP0624771B1 (fr)	1996-09-18	Tube plat pour un échangeur de chaleur
DE2655091C2 (de)	1984-06-07	Flexibles Leitungselement für Abgasleitungen von Kraftfahrzeugen
DE4243115C2 (de)	2002-05-02	Flexible, vibrationshemmende Leitung mit einem abgeflachten Querschnitt, insbesondere für die Abgasanlage eines Fahrzeugmotors
DE102007039292A1 (de)	2009-02-26	Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE2331324C3 (de)	1982-12-30	Scheibenwischer für Fahrzeuge, insbesondere Kraftfahrzeuge
EP2549198B1 (fr)	2013-12-18	Rail avec profil en C et collecteur solaire correspondant
DE3231640C2 (de)	1992-04-30	Wärmetauscher
DE3904654C2 (fr)	1991-02-07
DE102021213335A1 (de)	2023-06-01	Luftleitelement für einen Ausströmer zur Klimatisierung eines Fahrzeuginnenraums eines Kraftfahrzeugs
DE10001974B4 (de)	2012-03-29	Wärmetauscher
EP0770845A2 (fr)	1997-05-02	Tube d'échangeur de chaleur avec éléments turbulateurs générateurs de tourbillons
DE10148901B4 (de)	2004-05-06	Strömungsgleichrichter-Modul und Stömungsgleichrichter
DE10302926B4 (de)	2007-09-06	Vorgefertigte Einheit für eine Fußbodenheizung
DE6750415U (de)	1969-01-09	Schikane bzw. stroemungsablenkungseinsatz fuer waermeaustauscherrohre
EP1355012A2 (fr)	2003-10-22	Kit avec élément de connection d'angle
DE3249627C2 (de)	1986-05-15	Flexibles Leitungselement mit einem Wellrohr
DE3628183C2 (de)	1996-03-28	Wärmeaustauscher für den Untertagebetrieb, insbesondere Wetterkühler
DE4028437A1 (de)	1992-03-12	Waermetauscher
DE102006040847A1 (de)	2008-03-06	Sammelkasten eines Wärmeübertragers
DE29605634U1 (de)	1996-08-01	Heizkörper, insbesondere Radiator
DE2619892C3 (de)	1980-06-04	Beilagering für Flanschen

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