SE127755C1

SE127755C1 - Element set for heat exchangers

Info

Publication number: SE127755C1
Application number: SE418945A
Authority: SE
Inventors: G K W Boestad
Original assignee: Ljungstroms Angturbin Ab
Priority date: 1945-05-28
Filing date: 1945-05-28
Publication date: 1950-03-28
Also published as: DE864560C; CH253573A; GB618606A; FR927384A; NL68205C; US2596642A

Abstract

618,606. Plate heat-exchangers. WATSON, F. (Aktiebolaget Ljungstroms Angturbin). May 22, 1946. No. 15540. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 29, 1946.] [Classes 64(i) and 64(iii)] In a plate heat exchanger in which the plates either are alternately heated and cooled by gases flowing alternately through the same channels, or conduct heat between two media flowing through adjacent channels, superimposed plates are spaced by ribs 12, 14, bars, or the like to form open channels, and have between the ribs, etc., furrows 16 which are narrow and shallow compared with the width and depth of the channels and are oblique to the general direction of fluid flow. The furrows produce in each channel upon different portions of the boundary layer, in different places on the same cross-section, lateral flow in opposite rotative senses. The furrows may be all parallel, as shown in Fig. 3, or be arranged chevronfashion in each channel, as shown in Fig. 8. All the plates may be furrowed, or alternate plates 36 may be substantially flat, as shown in Fig. 8. The ribs may be unequal distances apart, or extend to different distances from the edges of the plates, so that by reversing successive plates during assembly nesting can be avoided. Specifications 363,357, [Group XII], and 393,341 are referred to.

Description

Uppfinnare: G. K. W. Boestad. Inventor: G. K. W. Boestad.

Foreliggande uppfinning hfinfor sig till elementsatser for varmevaxlare av plat, i vilka kanaler for varmeavgivande respektive vat.- meupptagande medier bildas mellan pa avstand frau varandra anordnade platar. Elementsatser av denna typ aro tidigare anvanda, speciellt for luftforvarmare av den regenerativa typen, varvid elementsatserna varit sammausatta .av -vaxeMs anordnade platar med och utan ,sarskilda avsthndshsar, alltsâ platar av olika profit (jfr svenska patenten 81 415 och 88 357). Tillverkningen_ av olika plattyper ,och i annu hogre grad hopmonteringen av plater av olika typer till en elementsats blir emellertid on5digt komplicerad och aven dyrbar, och andamalet med uppfinningen är darfor att astadkomma en fly struktion, genom vilken monteringsarbetet forenklas och tillverkningen Over huvudtaget forhilligas. The present invention relates to element sets for plate heat exchangers, in which channels for heat-emitting and water-absorbing media are formed between spaced plates. Element sets of this type have previously been used, especially for air preheaters of the regenerative type, whereby the element sets have been the same set of plates arranged by -vaxeMs with and without, separate spacers, i.e. plates of different profits (cf. Swedish patents 81 415 and 88 357). However, the manufacture of various types of slabs, and to an even greater extent the assembly of slabs of different types into an element set, becomes unnecessarily complicated and even expensive, and the object of the invention is therefore to provide an escape structure which simplifies assembly work and generally sanctifies manufacture.

Elementsatsen enligt uppfinningen bestar shlunda av lampligen korrugerade plater, som hallas pa avstand frail varandra medelst sarskilda, raka avstandsasar, uppressade i platarna, och kannetecknas i huvudsak darav, att asarna i varje plat aro anordnade ph varierande a-vstand fran varandra. The element set according to the invention thus consists of suitably corrugated plates, which are kept at a distance from each other by means of separate, straight spacer shafts, pressed into the plates, and can be characterized mainly by the fact that the axes in each plate are arranged at varying distances from each other.

Om platarna aro forsedda med avstandsA.sar ph like avstand frau varandra, kunde man vid tillklippningen av platarna forfara ph sadant satt, att ett omrade mitt emellan tvenne hsar ej far klippas. Om det sedan vid hopmonteringen skulle intraffa, att avstandsh.sarna i tvenne pa varandra fiiljande plater skulle sammanfalla, behavde man endast svanga den ena 180° for att undvika denna olagenhet. Detta tillvagagangssatt fororsakar emellertid ett oniidigt platspill, vilket ken undvikas, gernom att .avstandsasarna enligt uppfinningen anbringas ph varierande avstand frhn varandra, sh att man, oberoende ay hur klippningen tillghr, alltid med salter- het ken undvika, att samtliga avstandshsar i en plat sammanfalla med hsarna i en intilliggande plat, orn sâ skulle erfordras, genom aft svanga en av platarna 180° i dess plan. If the plates are provided with a distance equal to the distance from each other, one could proceed when cutting the plates in such a way that an area between the two houses is not allowed to be cut. If, during assembly, the spacers in two successive plates were to coincide, only one would have to swing 180 ° to avoid this disorder. However, this approach causes an unnecessary waste of space, which is avoided by placing the spacers according to the invention at varying distances from each other, so that, regardless of how the cutting is done, it is always possible to avoid that all spacers in a plate coincide. with the hoists in an adjacent plate, as would be required, by turning one of the plates 180 ° in its plane.

Pa bifogade ritning visas som exempel en utforingsform av plater for elementsatser enligt uppfinningen. The accompanying drawing shows by way of example an embodiment of plates for element sets according to the invention.

Avstandshsarna 1 forlona i huvudstrornsriktningen Mr de medier, som skola passera varmevaxlaren. Platarna are dessutom lampligen forsedda med lagre vagor eller korrugeringar 2 i viss vinkel mot huvudstromsriktningen. Vagorna eller korrugeringarna 2 hava till andamal dels att forstyva de enskilda plhtarna dels att verka avledande pa huvudstrommen, sã att tvarvirvlar uppkomma I kanalerna mellan avstandsasarna 1 och dhrigenom varmeoverfOringen forbattras. DA varmevaxlarens rotor har formen av en cylinder och elementsatserna darigenom erhalla sektor- eller kilform, ken man vid tillverkning av platarna enligt uppfinningen lampligen installa klippmaskinen sã, att den avskar pia-tar av succesivt varierande langd, vilka sedan som ett paket kunna ph en gang insattas i sin sektion i varmevaxlaren. Harigenom kommer gtvetvis monteringsarbetet att avsevart forenklas och fOrbilligas. The spacers 1 in the main current direction Mr the media, which must pass the heat exchanger. The plates are also suitably provided with bearing scales or corrugations 2 at a certain angle to the main current direction. The carriages or corrugations 2 have, for the purpose, partly to stiffen the individual plates and partly to act as a deflector on the main stream, so that transverse vortices arise in the channels between the spacer axes 1 and thereby the heat transfer is improved. The rotor of the heat exchanger is in the form of a cylinder and the element sets thereby obtain a sector or wedge shape. When manufacturing the plates according to the invention, the cutting machine can be suitably set so that it cuts plates of successively varying length, which can then be packaged once as a package. inserted in its section in the heat exchanger. As a result, the assembly work will of course be considerably simplified and cheaper.

Claims

1. Patent claim: Element set for heat exchangers, especially of the regenerative type, consisting of suitably corrugated plates, which are held apart by means of different rake spacers, pressed into the plates, characterized in that amnia in each plate is arranged at varying distances. frail each other. Stockholm 1950. Kong '. Boktr. P. A. Norstedt 8r Sour 500080