FR2532567A1 - METHOD OF MANUFACTURING A HEAT EXCHANGER AND HEAT EXCHANGER OBTAINED BY THIS METHOD - Google Patents

Abstract

TO WELD A GROUP OF PLATES TOGETHER TO FORM A HEAT EXCHANGER, USING LASER OR ELECTRON BEAM WELDING OR SIMILAR PROCESSES INVOLVING WELDING THROUGH THE PLATE, THE PLATES ARE SHAPED, BY WELDING THROUGH THE APPROPRIATE PLATE, THROUGH THE PLATE. IN SUB-ASSEMBLIES1 AND 21 WITH PERIPHERAL SEALS8 AND 23 RESPECTIVELY, THE PERIPHERAL SEALS23 OF THE SUB-ASSEMBLIES21 EXTENDING ENTIRELY INSIDE THE LINE OF PERIPHERAL SEALS8 OF THE SUB-ASSEMBLIES1. THIS MEANS THAT TWO SUB-ASSEMBLIES CAN THEN BE WELDED TOGETHER THROUGH THE PLATE AND THE ASSEMBLY CONSTRUCTED IN THIS WAY. THE OPENINGS3 AND4 FORMING THE DUCT OF THE SUB-ASSEMBLIES ARE IN TURN ISOLATED FROM THE FLOW SPACES BY THE SPACERS11 AND24, RESPECTIVELY. THESE SPACERS ARE ALSO APPLIED BY WELDING THROUGH THE PLATE AND ATTACHED TO THE FOLLOWING PLATE BY WELDING THROUGH THE PLATE.

Description

  F-ABRICATIGN PROCESS D) IJN E Ci HEAT INHIBITOR, AND SAMPLE

  GEUR OF C 3 AKLEUR CBTE 7 NU'I BY CE? Cc The present i'nventi-on relates to the

cha'l eur.

  A plate heat exchanger consists of a group of heat transmissive separable plates which are disconnected from each other in such a way as to delimit them from each other. spaces

  The spaces of C 7 coulaen-zir are equally deli-

  mended and bounded by engineering joints abituellemient

  the material to be written on p 11 a qas.

  The connections between the spaces of olun are ensured by das orifices in the N eyes mn: zgés dnns the plates,

  which constitute conduits for feeding and

  cuation for two media to be placed in relation

  of heat exchange, and the joint 2 of the joints also equals

  the arrival of the media in the flow spaces, so that one of the media circulates in one of the two-way flow and the other medium circulates in the flow spaces: intermediate, idiary The speciaces of flow can be, and usually are, provided

  flutes or streaks favor the ur-bilencce.

  Such heat exchangers have found wide applications and are commonly used in many industries.

  of Etan-Chéité imposes in fact Contr-a J Xnt rux e: ur ut-ili-

  with corrosive or non-corrosive fluids, for example, with radioactive substances, since they are exposed to corrosive fluids; For a longer period of time, the electrical connections need to be well maintained if high service pressures are to be avoided. is currently trying to find a satisfactory heat exchanger which is made up of three welded coils between them; a few of the characteristics of plate heat,

  in the case of the presence of watertight joints

Cheetah 1 ees

  In such cases, the welds must be

  W o rk -: erth e w ith s 3 14 d 3 sc s'i -1 Do not use the same heat weld of this type apa "t is difficult if not a: rossle, the whole of the device risk of must be put

  Ai bzenr cn: ara solidcs, 11 is pro-

  This is the laser beam or the

  This is the effect of such an exchange of

  heat, however, when assembling bands of

  In the case of a thick heat-exchanger plate (thickness of 0.7 mm, for example), these techniques can only be used with any certainty o weld through p'L'a qua, as opposed to welding through

the nrtieplus er issa.

  Con 2 srmzwernent to? According to the present invention, it is possible to provide a heat exchanger which includes a group of plates which are welded together in such a way that it is possible for them to achieve a certain degree of certainty. distance one of lt dere and: itar spaces of flow is: ex -cqu: dclesa plates entarnt d \ evcatcn pure ds-I ~ d ~ ichzrne heat, process

  dar 'laualon dore dux L: D d: ou-together the plates

  spacers in the form of spacers spaced by a chess plate

  The second type of enterprise is one of the largest enterprises in the world.

  tose prj 2 hereue it -no line, outside the oulez area and o the euruJ l'ens-emf Ile des orifices forr: at les 4-retoisas of waterproof ferrmeture of the orifices surround two orifices in order to isolate them from the flow gap bounded by the peripheral spacer, the second-wire undertrays of the second type comprise a peripheral spacer which passes outside the orifices located opposite said two openings in the

  subsets of the first type to enable them to

  to connect with the flow space 2, and also having two spacers sealing holes around

  two other holes to isolate them from the flow space.

  The lines followed by the peripheral struts are such that when a subassembly of one type is subsequently assembled to a subassembly of the other type, the orifices facing each other and a single set of spacers lying between the plates, the lines followed by the peripheral spacers do not intersect, and by erecting a superposition of subsets by adding in turn a subset of each type and welding it through the plate to the spacers of the sub-assembly. previous set of

  to form continuous and waterproof welds.

  The welding of the subassemblies and superposed assemblies is preferably done with the laser, but it is possible to

  also use electron beam welding.

  It should be noted that since the peripheral gap seals are one within the

  the other, a perimeter joint of each type may

  be removed from a sheet of material, for

example using a laser.

  To better understand the purpose of the Vinven-

  tion, we will describe below, as an example purely

  illustrative and not limiting, an embodiment

on the attached drawing.

On this drawing

  FIG. 1 is an elevational view of a sub-section

set of a -first type;

  FIG. 2 is an elevational view of a sub-section

  corresponding set of another type

  FIG. 2a represents a variant of the sub-

all of Figure 2; and

  FIG. 3 is an enlarged sectional view, followed

  line IV-IV of Figures 1 and 2, of a set of

superimposed plates.

  The complete heat exchanger, when manufactured in accordance with the present invention, consists of a group of piaques which are arranged opposite one another at a distance from each other and whose spacing and

  assembly are provided by welding to spacers.

  The plate assembly is illustrated in the sectional view of FIG. 3, and each of FIGS.

  spacer-spacer subassembly of a first type.

  Consider first Figure 1 This represents a subset 1 consisting of a plate 2 in which are formed the conventional angle ports 3, 4, 5 and 6, two of which are in communication with a space

  7 formed between the plate 1 and the adjacent plate

  1). In accordance with normal practice, in the flow space may be provided grooves or ridges of a suitable type which is designed to promote turbulence and heat exchange. and these may correspond with or intersect with the grooves provided on the adjacent plates. The actual shape of the beads and the flow space are not part of the present invention and no need to be described

in detail.

  The spacer 8 extends outside each of the four apertures 3, 4, 5 and 6 and is welded to the plate 2 by laser welding or electron beam welding performed through the plate. that is to say,

  from the posterior face of the plate as represented

  on the right side of the aisle which appears on the

  figure The openings 3 and 6 are surrounded by

  respective separation tables II and 12, these serve

  to isolate one of the media of the flow space 7.

  Conversely, the orifices 4 and 5 are in correlation with the flow space 7. The spacers 11 and 12 are also welded, through the plate, by means of welding.

laser or electron beam.

  Now consider Figure 2, which represents

  A subassembly 21 of a slightly different type is also provided with a plate 2 having orifices 3, 4, 5 and 6, and has a flow space 22 surrounded and bounded by a spacer 23 passing C 1 'exte ~ laughing each of the openings 3, 4, 5 and 6 and also welded to the plate 2 by laser welding or electron beam through the plate In this subset, the orifices 3 and 6 are in communication with the flow space 22, while the openings 4 and 5 are respectively surrounded by welded spacers 24 and 25, also welded through the plate by welding

  laser or electron beam.

  It should be noted that the line followed by the

  is located entirely within the line followed by the spacer 8 I Drsque subsets 1 and

  21 are assembled to each other and that the orifices cor-

  correspondants are opposite each other, and also that the lines followed by these spacers 8 and 23 do not cut the lig 1 nes followed by the spacers 11, 12,

24 or 25.

  As a result, when a subset of type 1 is superimposed on a subset of type 21, the two subassemblies can be bonded to each other.

  following a welding line which is shown in

  23a and which corresponds to the line followed by the spacer 23 on the sub-assembly 21 This welding can

In the case of ri-soul, the farm

  of the ILs and 5 by means of a 3-point space, along the lines and 251a to the lines followed by

es :: t25.

  One; Alternatively, a subassembly 21 may be further subdivided into a subdenmcle 1 by a weld through the C., where it has the following 12 correspoilding elements, such as, for example, Li-eto-ses 8, He and 12 on the

s-, t, _s-cnsenb, the sub-% cer-t 1.

  it is possible to build, 21 r a super-

  o,> itIon P L 2 1 Z-j so-c-c -;, cs the lines to the

  _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

  the iv, -; n -, - - are flat and thin species of color

  and heat transfer characteristics of the samples.

lakes C slaps.

  Although the spacers periràériques 8 and 21

  they are not the prolongation of the plates, it is

  In the case of a heat exchanger with plates, it is seen that the whole assembly is welded together and that it consecutively reduces the cost of rendering the blades to their integrity. in

labus of acsi "é.

  Rewrite: jent u, 4 ie Z 'cut Through 5 31 4 or where, such a piece has a number 31 and 3 2 - C i-co S catequ C CI 1 1 trz: t N i S e S i mi '-, area d the rer're 8' D, and an en-freto 1 se ilb of gold isolation: Eic-s, to

  1 to 1, 2 to 31.

  they are welded with a technique of N uti-2-santle at

  laser or at 21 sce electrons lice subset -

  bie, and it is a pre-è rd together of 1 J. Te Te 21 Ventretoise peripheral 23 a Ins-1

* 7

  that a spacer 24 which isolates the orifice 4 from space

flow 22.

  To the set obtained, we then assemble a sub-

  type 1 assembly comprising the peripheral spacer 8 and a spacer 11 which isolates the orifice 3 from the space

  of flow 7 The superimposition of

  by adding subsets 1 and 21 alternately,

  as shown in Figure 4, and after the last sub-

  together the other end plate 32 is welded, by welding

  through the plate, to the spacers of the last subassembly

  ble, which in the case illustrated are the spacers 8 and 11

of the subset 1.

  In the arrangement shown in FIGS. 1 and 2, the peripheral spacer 23, as well as the peripheral spacer 8, passes outside each of the four

  orifices 3, 4, 5 and 6 It may in some cases be pref-

  that this spacer passes inside the holes

  4 and 5, as is the case of the spacer 33 in FIG.

  This, of course, involves a modification of the corresponding welding line of FIG. 1, and may also involve some reshuffling of the positioning pattern of the orifices 4 and 5, which may then be somewhat closer to the edge of the plate, since a single gasket instead of

  two, must pass outside these orifices.

  It is understood that the embodiment described above is in no way limiting and may give rise to any desirable modifications, without departing for that

of the scope of the invention.

  Thus, some of the orifices 3 4, 5 and 6 may, in certain subassemblies, not be perforated

  so that multi-pass arrangements can be made.

  R) v = Tj D> e 1 a TI Ol'YS i A method of manufacturing a heat exchanger comprising a group of plates assembled by welding face fa ce and a certain distance from each other so celimiter the flow spaces between adjacent plates, the plates having orifices

  which form ducts for feeding and evacuation

  for heat exchange media characterized by

  the fact that two types of platelet subsets

  spacer (1; 21) by sealing

  toises at one of the sides of the plate by welding through

  the plate, the subassemblies (1) of a first type

  a peripheral strut (8) which follows a line around the flow space (7) and outside each of the openings (3, 4, 5, 6) forming the conduits, and spacers (11, 12) sealing holes around two (3 and 6) orifices (3, 4, 5, 6) to isolate

  the latter of the flow space (7) bounded by the

  peripheral toe (8), the subassemblies (21) of the second type comprising a peripheral spacer (23) which passes outside the orifices opposite said two orifices (3, 6) in the subassemblies (1) of the first type to allow these orifices to communicate with the flow space (22), and two watertight seal spacers (24 and 25) orifices around the two other orifices (4, 5) to isolate the latter flow space

  (22), the li-l: es followed by the peripheral spacers-

  (8; 23) being such that when one assembles a sub-

  Together with one type, a subassembly of the other type, the orifices being opposite each other and a single set of spacers lying between the plates, the lines followed by the peripheral spacers (8; do not cut, and by constructing a subset overlay (1; 21) by adding in turn a subset of each type and

  welding it, through the plate, to the spacers of the

  previous set to form continuous welds

and waterproof.

  Process according to Claim 1, characterized in that the sub-assemblies (1; 21) are formed by laser welding. 3 Method according to claim 1, characterized in that the subsets (1; 21) are formed by

electron fillet welding.

  4 according to one of claims 1 to 3,

  characterized by the fact that the subassemblies (4: 21) are assem- bled between each other because they are welded to the laser. Saon process is one of the revisions 1 to 3, characterized by the fact that the subassemblies are assembled together.

  (i; 21) between them by electron beam welding.

  Process according to one of Claims 1 to 5

  characterized in that the peripheral spacers (8; 23) of a sub-assembly are cut from a single sheet

(1; 21) of each type.

  Method according to claim 6, characterized

  in that the spacers (8; 23) are cut to the laser.

  8 heat exchanger 1 eur welded, characterized in that it is manufactured by a method as defined

to one of claims i to 7.