FR2467369A1 - HEAT EXCHANGER WITH PLATES AND BARS WITH INTEGRATED HEADS - Google Patents

Abstract

Heat exchange. The plate-type heat exchanger is formed by an alternating stack of bars 4 and of plates 1, the bars forming at their ends pads sandwiched between corresponding parts of the plates, so that the stack constitutes uprights at the four ends in which are provided machining 12, 13 for fixing flanges or other parts 14, 15. Plate type heat exchanger. (CF DRAWING IN BOPI)

Description

The present invention relates to a new exchanger

  with plates and bars, that is to say an exchanger in the-

  which of the plates are arranged parallel to each other

  others and are kept apart by barrette

  alternatively placed at 900 to delimit channels

successive crossing.

  The construction of plate and barrel exchanger bundles of the type referred to above is well known in the art. The beams of this kind can not be used naked but must have connecting means for connecting them to the fluid circuits, for example

  water boxes, when the fluid is liquid or

  linkages for fixing to sheaths or

  when the fluid is gaseous.

  In the art, it is common to weld

  water and the flanges on the beam by running

  arc welding. However, it was found that the

  Arc welding could cause deterioration

rations to the soldering beam.

  The Applicant has proposed brazing amounts at the four corners of the beam and then bring ties to the ends of the brazed uprights to form a connecting flange. Indeed, in this case, the sleepers can be arc welded to. locations

  distant from the solders and therefore these are not

riorées.

  This provision, however, still

  disadvantages. Indeed, it appeared that the brazing of the amounts is difficult to achieve perfectly because the solder flows down along the mountings and it

  It is also common that porosities exist in certain

  some solder between the plates and the bars. These porosities can not be clogged when

  under the amounts because they are inaccessible

ble.

  The present invention aims to remedy the drawbacks

  mentioned above by creating a new exchanger of extremely simple design that can be manufactured in

  many metals or alloys whose choice essentially depends on

  the use that must be made of the exchanger.

  The invention applies equally to samples

  small or large, whether these samples are

  are intended for industrial use or to be

mounted on vehicles.

  According to the invention, the plate-and-bar heat exchanger in which the connecting flanges are formed by four uprights and crossbeams connecting

  these amounts between them is characterized in that the

  are constituted by alternating stacking of the bars

and corners of the plates.

  Various other features of the invention

  from the detailed description which follows.

  Embodiments of the subject of the invention are represented, by way of non-limiting examples, in

attached drawing.

  Fig. 1 is a schematic perspective and partially cut away from a beam of a plate heat exchanger

  constructed according to one embodiment of the invention.

  Figs. 2 to 4 are perspectives of different

  embodiments of the strips used in the

heat exchanger of FIG. 1.

  Fig. 5 is an exploded perspective illustrating

  particular features of the invention.

  Fig. 6 is a section of a next exchanger

  the invention realized with a loop circuit.

  Fig. 7 illustrates another embodiment.

  Fig. 8 is a plan illustrating a characteristic

that particular.

  The plate heat exchanger shown in FIG.

  Fig. 1 is produced in a manner known per se by a stack of

  age of plates and bars. In the embodiment

  represented in this figure, the plates 1, the ...

  feel the shape of rectangles whose sides are

  checked as illustrated in 2 in order to define at the four corners of the rectangle protruding portions 3 constituting rectangular corners. In practice, the plates 1, the ... are easily made by cutting

  notches 2 in the lateral edges of a recess plate

  tangential, which thus automatically delimits the protruding parts 3. The bars 4 which laterally delimit the

  The channels are intended to form the amounts 4a of the sample.

  geur. The bars can be made in different ways. In fig. 2, the bars comprise two metal studs 5, of rectangular section, in which

  there are notches 6 for the introduction of the ex-

  tremities of a blade 7 which is fixed to the studs by bra-

  sure, these operations being done at the same time as the bar-

  rettes are brazed to the plates 1, the ...

  In fig. 3, the studs 5 are connected by a blade

  7a which is welded as illustrated in 8.

  Finally, in fig. 4, the pads 5 and the blade 7b

  are monoblock, the entire bar being for example

  made by forging or cutting.

  As is obvious, the height of the blade 7,

  -7a or 7b is the same as that of the pads 5.

  To constitute an exchanger bundle, two longitudinal bars, a plate, two transverse bars, a second plate, two longitudinal strips, a third plate and thus

  right now. It is also possible, if desired, to dis-

  set up secondary exchange organs 9, respectively

  in either of the two sets of channels

by the plates.

  The protruding portions 3 of the plates 1, the ... are thus sandwiched between the studs 5 of the strips

  whose blades 7 are slightly behind

  at the edge 11 of the plates in the area of the notches 2

  (Fig 6). On the contrary, it is advantageous that the outer edge

  dull of the salient parts 3 of the plates be aligned

  the best possible with the outer edge of the studs 5.

  The entire beam made by stacking is often

  put in a brazing operation whose subsequent operation de-

  hangs from the nature of the metals or alloys used for

constituting the beam.

  As shown in fig. 5, to complete the beam, there are full longitudinal bars 41 on

  each of the two sides of the beam and the bars

  transverse noses 42 on each of the other two sides

  of the beam so that these full bars that is to say

  say having the shape of a rectangular parallelepiped,

  form with the uprights 4a a peripheral flange.

  It is then necessary to machine the faces formed by the uprights and the bars 41 and 42. In the exemplary embodiment considered, this can be done by grinding, because the input and output faces of the beam are set back from the plans to be machined that constitute after that

  the connecting flange of the exchanger to the fluid circuits.

  Fig. 7 illustrates a second embodiment of the invention in which the plates 1 ', the a._ are rectangular and the parts thereof to be integrated in the amounts are simply separated from the rest

  by small notches 2a. In this way, the almost total

  the volume delimited by the amounts may be used

  by the beam of a more compact device. It remains possible to machine the uprights and the end strips to have a good flatness of the connecting flanges by performing their milling without forming barbs through

  to the notches 2a which separate the input faces or -

beam output amounts.

  Fig. 8 partially shows a bar whose blade 7a is shaped to extend to the edge of the

plates 1 ', the ...

  A following operation is to drill, in the amounts, holes 12, 13, possibly tapped, or to perform other machining to allow fixation

  accessories such as schematic collector

  14, 15 (Figure 5) in the form of connecting flanges.

  from the exchanger to the ducts for the circulation of a gas. The holes 12, 13 can without inconvenience be pierced both in the mass of the studs 5 and in the plates taken

  sandwiched between the pads to which they are brazed.

  The connection flanges 14, 15 or boxes and other accessories to be fixed to the uprights and to the solid bars 41 and 42 can be assembled at right angles.

yen of screws.

  The sandwich arrangement of the plates and barrettes

  bracing makes the solder always available

  between stacked elements so that there is no risk that this solder will tend to flow down the

  beam at the moment of fusion. Moreover, this

  Sandwich position allows to bring the brazing in the form of a prior veneer of some of the pieces in

  particular plates and that whatever the

selected rates or alloys.

  Fig. 6 shows that the described embodiment possibly makes it possible to manufacture circulation exchangers

  loop in at least one of the two circuits they pre-

  feel. Indeed, intermediate pads 5a can be provided, these intermediate pads 5a being connected

  by a blade 7d separating each channel in two.

  In this case one of the boxes 141 is made to include inlet and outlet ducts 16, 17 while

  that the other box 142 forms only a lid.

  The exchanger can lend itself easily to operations

repair or recovery.

  A sealant may be disposed in the threaded holes drilled in the posts if it turns out that

solders are porous.

  Especially it is possible to access in any point to

  the periphery of the solders, which makes it possible to repair

  possible leakage by soldering or strong soldering.

  The invention is not limited to the exemplary embodiments

  are represented and described in detail, as various modifications can be made without departing from its scope.

Claims (8)

  1 - plate and strip heat exchanger in which the connecting flanges are formed by four uprights and crosspieces connecting these uprights together, characterized in that the uprights are constituted by   alternating stacking of the bars and corners of the plates.   2 - Exchanger according to claim 1, characterized   in that the bars form at their ends blocks connected together by a thinned portion in the form of blade.   3 - exchanger according to one of claims 1   and 2, characterized in that the thinned portions in the form   of the bars are set back by   port to the outer face of the uprights.   4 - exchanger according to one of claims 1   at 3, characterized in that the plates have notches extending in their sides to near the uprights, said notches extending over all or part of the side of said plates.   5 - exchanger according to one of claims 1 to 4,   characterized in that the stack constituted by the ends   of the strips and the parts of the plates sandwiched between them is machined to form a bearing surface from which are machined operations, including tapping, for the establishment of organs   attachment of accessories applied against the uprights.   6 - exchanger according to one of claims 1   at 5, characterized in that the upper parts of   The uprights are connected by barrel-shaped sleepers.   tes showing no thinned part.   7 - exchanger according to one of claims 1 to 6,   characterized in that the bars have on one side   tee of the exchanger of the intermediate pads to realize   a looped circulation beam.   8 - Steamer according to one of claims 1 to   7, characterized in that the input and output faces   of the beam are substantially in the   by the outer faces of the uprights.