DK155469B

DK155469B - EXCHANGER PLATE

Info

Publication number: DK155469B
Application number: DK179685A
Authority: DK
Inventors: Felix William Wright; Geoffery Richard Evans
Original assignee: Apv Int Ltd
Priority date: 1983-08-23
Filing date: 1985-04-22
Publication date: 1989-04-10
Also published as: WO1985001100A1; CA1266044A; DK179685D0; JPH0717956Y2; JPH0640682U; BR8407032A; KR850700065A; EP0134155B1; DK155469C; ATE28358T1; GB2145511A; EP0134155A1; GB8322580D0; JPS61500035A; DK179685A; GB2145511B; KR930004211B1; DE3464798D1

Abstract

A heat transfer plate for heat transfer apparatus, such as heat exchangers or evaporators is disclosed which is at least partially bounded by a groove (32) for receiving a gasket for general conformity therewith and to seal against an adjacent plate, wherein; the groove comprises an inner side wall and an outer side wall; the outer side wall of the groove is provided with a number of lateral bays (30), the gasket being formed with a number of corresponding spaced projections engaging in and matching with said bays; the base (33) of each bay is at a level other than the base (34) of the groove, and; each bay (30) does not communicate with the ambient thereby limiting movement of the gasket material along each said bay. The embodiments of the invention have a common feature that the gasket sealingly engages the rear wall (27). This engagement limits extrusion of the gasket material along the bay of the groove and thereby prevents <<blowing-out>> of the gasket at these points. Furthermore the floor of the bay, (40) is at a level other than the floor of the groove (42). This difference in level aids engagement between the gasket and the heat-transfer plate.

Description

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DK 1 5 5 4 6 V BDK 1 5 5 4 6 V B

Opfindelsen angår plader til varmeoverforse 1sapparater, såsom varmevekslere eller fordampere og af den i krav l's indledning afgivne type.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to plates for heat transfer apparatus, such as heat exchangers or evaporators and of the type provided in the preamble of claim 1.

g I et sådant varmeoverførselsapparat overføres varme imellem to tynde, brede strømme, som begge kan være væske eller bestå af en strøm af væske og en strøm af damp eller to strømme af damp. I nogle tilfælde kan den ene eller begge strømmene have blandede væske- og dampfaser. Strømmene er adskilt 1Q ved hjælp af plader, der er samlet med en indbyrdes afstand side om side, så at der tilvejebringes gennemstrømningsrum imellem pladernes nærliggende flader. Gennemstrømningsrummenes grænser er lukkede og forseglede ved hjælp af fleksible eller eftergivelige pakninger, som omgiver gennemstrøm-ningsrummene og strækker sig omkring disse og indstrømnings-og udstrømningsportene. Portene, hvoraf der normalt findes en i hvert hjørne af en plade i pladevarmevekslere, er normalt fuldstændigt omgivet eller delvis omgivet af pakninger.g In such a heat transfer apparatus, heat is transferred between two thin, wide streams, both of which may be liquid or consist of a stream of liquid and a stream of steam or two streams of steam. In some cases, one or both streams may have mixed liquid and vapor phases. The streams are separated 1Q by plates which are spaced apart side by side so as to provide flow space between the adjacent surfaces of the plates. The boundaries of the flow compartments are closed and sealed by flexible or resilient gaskets which surround the flow compartments and extend around them and the flow and discharge ports. The gates, usually one in each corner of a plate in plate heat exchangers, are usually completely or partially enclosed by gaskets.

20 I vævskulturkar er der også blevet anvendt en i alt'væsent-ligt samme konstruktion som i pladevarmevekslere, idet disse vævskulturkar drager fordel af det store overfladeareal, der frembydes ved -en sådan konstruktion. I sådanne kar indeholder pakningsindretningen en eventuel patogenisk organis-me, og i nogle udførelsesformer udsættes den for varmechok L 0 i forbindelse med damprengøring. Det er derfor yderst vigtigt, at pakningernes forseglende evne ikke ødelægges.In tissue culture vessels, a substantially the same construction as in plate heat exchangers has also been used, these tissue culture vessels taking advantage of the large surface area provided by such a structure. In such vessels, the packing device contains a possible pathogenic organism and in some embodiments it is subjected to heat shock L0 in connection with steam cleaning. It is therefore extremely important that the sealing ability of the gaskets is not destroyed.

Hver pakning er normalt af en ud i ét tildannet konstruktion, som er anbragt i en presset rille, der er tildannet i pladen.Each pack is usually of an integrally formed structure which is arranged in a pressed groove formed in the plate.

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Fremstillingen af pakningen foregår normalt i forme, men i overensstemmelse med størrelsen af pladen eller de anvendte fremstillingsteknikker, kan den også være samlet af to eller flere mindre komponenter. Pakningerne er normalt støbt afThe manufacture of the package usually takes place in molds, but according to the size of the plate or the manufacturing techniques used, it may also be assembled from two or more smaller components. The gaskets are usually molded off

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et elastomerisk materiale.an elastomeric material.

Forseglingskraften over for f 1 uidumtrykket i gennemstrømnings-rummet opnås ved sammenpresning af pakningerne i en retning 2The sealing force against the f 1 pressure in the flow space is obtained by compressing the gaskets in a direction 2

DK 15546TBDK 15546TB

vinkelret på pladeoverfladen, og modstanden overfor, at pakningerne presses ud af den rette forseglingsposition i rillen, øges normalt ved at fastgøre pakningen på pladens overflade ved påføring af et klæbemiddelsystem, hvilket er nødvendigt 5 til visse anvendelser for at minimere pakningsbevægelsen, således at denne ikke resulterer i lækage. Sådanne bevægelser kan skyldes ændringer i en enkelt paknings belastningstilstand, som kan ændre pakningens tilstand til hver side, og, af måske større betydning, er pakningerne anbragt i en rille, der 10 er dannet af det pågældende plademateriale, og derfor er fleksibel. Det pågældende klæbemiddelsystem er ofte kompliceret og tidskrævende, idet det indebærer påførsel af et klæbemiddel på både pakningen og pladens overflade, og dernæst samling af de to komponenter. Alt efter hvilket system, der 15 anvendes, kan det være nødvendigt at' forberede de to komponenters til hinanden svarende flader før samlingen, og det kan også være nødvendigt at underkaste de samlede komponenter for en proces beregnet til hærdning af sammenbindingen efter sam-1 i ngen.perpendicular to the plate surface, and the resistance to the gaskets being pressed out of the proper sealing position in the groove is usually increased by attaching the gasket to the plate surface by application of an adhesive system, which is necessary for certain applications to minimize gasket movement so that it does not resulting in leakage. Such movements may be due to changes in the loading condition of a single package, which may change the condition of the package to each side, and, perhaps more importantly, the packages are arranged in a groove formed by the sheet material concerned and therefore flexible. The adhesive system in question is often complicated and time-consuming, as it involves the application of an adhesive to both the gasket and the surface of the plate, and then the joining of the two components. Depending on the system used, it may be necessary to prepare the surfaces of the two components corresponding to one another prior to assembly, and it may also be necessary to subject the assembled components to a process intended to cure the bond after joint-1. Lovibond.

2020

Den hidtidige beskrivelse dækker den indledende fremstillingsproces. Det er almindelig praksis, at da elastomeriske pakningsmaterialer bliver hårdere og deformerer under brug, kræver vedligeholdelse af pladevarmeveksleren hos brugeren ofte 25 udskiftning af pakningen. Fjernelsen af den gamle pakning kræver ødelæggelse af klæbemiddelbindingen og rengøring af rillen. Det er heller ikke altid muligt at underkaste den ny samlede pakning for en optimal klæbeproces, således som det vil være tilfældet under den oprindelige fremstilling hos 1e-30 verandøren.The previous description covers the initial manufacturing process. It is common practice that as elastomeric gasket materials become tougher and deform during use, maintenance of the plate heat exchanger by the user often requires replacement of the gasket. Removing the old gasket requires destroying the adhesive bond and cleaning the groove. Also, it is not always possible to subject the new overall gasket to an optimal adhesive process, as will be the case during the initial manufacture of the 1st-30th door.

Til industrielle formål er det almindeligt kendt at tildanne en tætningsrille i overfladen af en komponent, hvor rillen har en åbning med en mindre dimension end den eftergivelige 35 pakning, der skal føres ind igennem åbningen. Pakningen fastgøres herved eftergiveligt som følge af dens egen eftergi-velighed. En sådan rille er vanskelig at fremstille i en presset plade, da den ikke er let at fremstille under en enkeltslagspresseoperation.For industrial purposes, it is generally known to form a sealing groove in the surface of a component, the groove having an aperture having a smaller dimension than the resilient gasket to be inserted through the aperture. The package is thereby resiliently attached due to its own resilience. Such a groove is difficult to manufacture in a pressed plate as it is not easy to manufacture during a single-stroke press operation.

3 DK '554'K Β3 DK '554'K Β

Ved fremstillingen af pladevarmevekslere er det kendt at fastgøre en eftergivelig pakning til en åbning i et underlagsmateriale ved at skubbe lidt overdimensionerede fremspring igennem åbninger, som er placeret i bunden af rillen.In the manufacture of plate heat exchangers, it is known to attach a resilient gasket to an opening in a substrate material by pushing slightly oversized projections through openings located at the bottom of the groove.

55

Det er også kendt, at en pakning kan fastgøres til en overflade ved hjælp af fastgørelsesorganer, såsom en maske eller f.eks. tappe, som er fastgjort til eller tildannet ud i ét med pakningen, og fastgøres til overfladen udenfor tætnings-området. Sidstnævnte metode er vist i tysk patentskrift nr. 832.975.It is also known that a gasket can be attached to a surface by means of fasteners such as a mask or e.g. pins attached to or formed integrally with the gasket and attached to the surface outside the sealing region. The latter method is shown in German patent specification 832,975.

En yderligere kendt pakning, som tydeligst er beskrevet i US-patentskrift nr. 4.377.204, har en tap, som skal ligge 15 i et trug, og som fastgøres ved hjælp af et overdimensioneret fremspring, således som beskrevet ovenfor.A further known package, most clearly disclosed in U.S. Patent No. 4,377,204, has a pin which is to lie 15 in a trough and which is secured by an oversized projection, as described above.

Formålet med opfindelsen er at tilvejebringe et mekanisk indgreb imellem pakningen og pladen, således at nødvendigheden af 20 et klæbemiddelsystem undgås, og pakningen fastholdes over for kræfter, der forsøger at presse pakningen udad i retning mod pladens periferi.The object of the invention is to provide a mechanical engagement between the gasket and the plate, so that the necessity of an adhesive system is avoided and the gasket is retained against forces trying to push the gasket outwardly towards the periphery of the plate.

Dette opnås ved at varmeoverførselspladen er ejendommelig ved 25 de i krav l's kendetegnende del angivne træk.This is achieved by the heat transfer plate being characterized by the features specified in the characterizing part of claim 1.

Herved opnås, at pakningen uden brug af klæbemidler sikres fastholdelse i rillen på en sådan måde, at den kan modstå kræfter, som forsøger at presse den udad imod pladens perife-30 ri. Dette skyldes især, at indskæringerne afgrænses udadtil ved hjælp en ud i et med pladen tildannet væg, samtidig med, at indskæringens bund befinder sig i niveau over bunden af rillen, så at påvirkningen af pakningen i retning ud imod pladens periferi effektivt modvirkes af dels indskæringens ydre væg og 35 dels den del af rillevæggen, der findes imellem rillens bund og indskæringens bund.Hereby, the gasket is obtained without the use of adhesives, retaining in the groove in such a way that it can withstand forces which try to push it outwardly against the periphery of the plate. This is mainly because the notches are delimited externally by a wall formed with a plate, while the bottom of the notch is level above the bottom of the groove, so that the influence of the packing towards the periphery of the plate is effectively counteracted by the notch. outer wall and 35 partly the portion of the groove wall that exists between the bottom of the groove and the bottom of the groove.

Opfindelsen forklares nærmere nedenfor under henvisning til tegningen, hvor fig. 1 viser en kendt varmeoverførselsplade set ovenfra, 4 DK 1554698 fig. 2 et snit efter linien X-X i fig. 1, 5 fig. 3 en udførelsesform for en pakningsrille ifølge opfindelsen set ovenfra, fig. 4 et snit efter linien Y-Y i fig. 3 med pakningen til- 10 føjet' fig. 5 en anden udførelsesform for pakningsrillen ifølge opfindelsen set ovenfra, -5 fig. 6 et snit efter linien Z-Z i fig.. 5, ogThe invention is explained in more detail below with reference to the drawing, in which fig. 1 is a top view of a known heat transfer plate; FIG. 2 is a section along the line X-X of FIG. 1, 5 FIG. 3 is a plan view of an embodiment of a packing groove according to the invention; FIG. 4 is a section on the line Y-Y in FIG. 3 with the gasket 10 shown in FIG. 5 is a top view of another embodiment of the packing groove according to the invention; FIG. 6 is a sectional view taken along the line Z-Z of FIG. 5, and

Fig. 1 viser et omrids af en konventionel varmevekslerplade, hvor pladen 1 har de sædvanlige indstrømnings- og udstrømningsporte 2 og et centralt varmevekslerområde 3, som er omgivet af en eftergivelig pakning 4. Som vist i fig. 2, der 20 er et snit efter linien X-X igennem pakningen (vist med punkterede linier), er pakningen 4 monteret i en presset rille 5 og fastgjort til pladen ved hjælp af et overdimensioneret fremspring 6, som rager ud igennem et hul 11 ved et fastgørelsespunkt, placeret i et trug 7.FIG. 1 shows an outline of a conventional heat exchanger plate, the plate 1 having the usual inflow and outflow ports 2 and a central heat exchanger area 3 surrounded by a resilient gasket 4. As shown in FIG. 2, which is a section along line XX through the gasket (shown in dotted lines), the gasket 4 is mounted in a pressed groove 5 and secured to the plate by an oversized projection 6 which protrudes through a hole 11 at a point of attachment , placed in a trough 7.

2525

Et problem ved dette arrangement ligger i, at de betydelige overtryk, der forekommer i gennemstrømningsrum i en varmeveksler, presser pakningen 4 i retning på langs af truget 7, og bevirker at tætningen ødelægges ved disse fastgørel- o u sespunkter.A problem with this arrangement is that the significant overpressures that occur in flow-through spaces in a heat exchanger push the gasket 4 in the longitudinal direction of the trough 7, causing the seal to be destroyed at these attachment points.

I en anden kendt udførelsesform for en pladekonstruktion er pakningsrillen 19, som vist i fig. 3, forsynet med sideudvidelser i den lodrette væg 20, således som vist ved 11. I 35 dette tilfælde er pakningsrillens bredde udvidet lokalt. Det foreslås, at der imellem nogle eller alle disse udvidelser, skal rillekanten 20 deformeres, som antydet ved henvisnings- 5In another known embodiment of a plate construction, the gasket groove 19, as shown in FIG. 3, provided with side extensions in the vertical wall 20, as shown at 11. In this case, the width of the packing groove is expanded locally. It is suggested that between some or all of these extensions, the groove edge 20 should be deformed, as indicated by reference 5.

DK 155469 BDK 155469 B

tallet 21 og som vist i fig. 4, for at tilvejebringe sideindskæringer 21 i pakningsrillen.the number 21 and as shown in FIG. 4 to provide side notches 21 in the gasket groove.

c I en foretrukken udførelsesform for opfindelsen er sideindskæringerne 21 forsynet med huller 25, og på pakningen er der tilvejebragt fremspring 10, som er fremstillet med sådanne dimensioner, at de presses lidt sammen, når de passerer ind i hullerne, således at pakningen 8 og pladen 3 vil 10 forblive samlet, men kan adskilles igen ved at trække pakningen væk fra pladen.c In a preferred embodiment of the invention, the side notches 21 are provided with holes 25 and on the package are provided projections 10 which are made of such dimensions that they are slightly compressed as they pass into the holes so that the seal 8 and the plate 3, 10 will remain assembled but can be separated again by pulling the gasket away from the plate.

Det skal bemærkes, at de bredere dele af pakningsrillen normalt placeres således, at deres placering skifter fra plade 15 til plade, og i denne udførelsesform forbliver fremspringene 10 således upåvirket af sammentrykning, når pladepakningen presses sammen til funktionstilstande, hvilket skyldes, at hullerne 25 og fremspringene 10 er flyttet passende langt væk til den ene side af pakningernes tætningsflade.It should be noted that the wider portions of the gasket groove are normally positioned so that their location changes from plate 15 to plate, and in this embodiment, the projections 10 thus remain unaffected by compression as the plate gasket is compressed into operating states, due to the holes 25 and the projections 10 are suitably moved far away to one side of the sealing surface of the gaskets.

2020

Hullerne 25 behøver ikke at være placeret i bunden "af indskæringerne 21, men kan også være placeret i sideindskæringernes bagvæg 27 eller i deres sidevægge, ifald sådanne eksisterer.The holes 25 need not be located at the bottom "of the notches 21, but may also be located in the back wall 27 of the side notches or in their side walls, if such exist.

25 I en anden udførelsesform for opfindelsen, som vist i fig.In another embodiment of the invention, as shown in FIG.

5 og 6, er indskæringen 30 ikke placeret imellem to udvidelser, men tilvejebragt i den plane ydre væg 31 i pakningsrillen, som har en bund 34. Hullet 33a er tildannet i bunden af 3 Π indskæringen, hvorved åbnes mulighed for, at pakningen kan fastgøres til varmeoverførselspladen. I denne udførelsesform er indskæringen 30 retliniet i modsætning til den -i fig. 3 viste udførelsesform, hvor den er bueformet.5 and 6, the notch 30 is not positioned between two extensions, but is provided in the flat outer wall 31 of the gasket groove having a bottom 34. The hole 33a is formed in the bottom of the 3 Π notch allowing the gasket to be secured to the heat transfer plate. In this embodiment, the notch 30 is rectilinear in contrast to the -in FIG. 3 in which it is arcuate.

3535

Claims

Plate according to Claim 1, characterized in that the means for securing the gasket to the plate comprise a hole (33a) in the plate within the region of the cut (30) and a corresponding knob or projection on the projection. 10

A heat exchanger apparatus comprising a package or stack of plates according to claim 1 or 2. 15 20 25 30 35