FR2530328A1 - HEAT EXCHANGER WITH TUBES LOCKED TO THE MANIFOLD - Google Patents

Abstract

THE EXCHANGER INCLUDES TUBES 1 EQUIPPED WITH FINS 2. THE ENDS OF THE TUBES ARE ENGAGED IN COLLARS 5 IN ELASTIC MATERIAL WHICH ARE ARRANGED IN PASSAGES OF TUBES 4 OF COLLECTOR PLATES 3 COVERED WITH WATER BOXES 12. OF ELEMENTS OF WATER BOXES. STOP 7 ARE ENGAGED AND PARTIALLY DEFORMED BY THE END OF THE TUBES 1 PROJECTING BEYOND THE COLLETS.

Description

The present invention relates to a tube type heat exchanger and

  fins whose tubes are engaged in collecting plates to which they are

  connected by collars or sockets made of elastic material.

  The exchangers produced in this way are satisfactory, but they often require the provision of lateral flanges connecting the collector plates or the

  water boxes to prevent mechanical stress

  niques cause a gradual displacement of the sets

  manifolds-water boxes in relation to the tubes.

  Furthermore, it is desirable, in particular to reduce the cost price of the devices, not to use

side cheeks.

  To solve this problem, it has already been proposed

  to flare the part of the tubes which crosses the collecting plate

  trice and which extends beyond it The flaring or inflation of the end of the tubes constitutes an operation which is relatively long and therefore costly In addition, this

  flaring is incompatible with the use of collector plates

  already assembled in the boxes.

  The invention solves the problem set out by creating

  a new heat exchanger with tubes locked at the collar

  reader. According to the invention, the heat exchanger with tubes locked to the manifold comprising fins threaded onto the tubes which are themselves engaged in collars of elastic material arranged in the passages of

  tube of a collector plate, is characterized by elements

  stop elements having at least one hole with a diameter smaller than the outside diameter of the tubes, said stop element being forcibly threaded on the protruding end in the collecting plate of at least some of the tubes to which

it is connected.

  Various other features of the invention

  moreover emerge from the detailed description which follows.

  Embodiments of the object of the invention

  tion are shown, by way of nonlimiting examples,

in the attached drawing.

  Fig 1 is a partial and schematic sectional elevation of a heat exchanger produced in accordance

to the invention.

  Fig 2 is a sectional elevation, at larger

  scale, illustrating a characteristic of the invention.

  Fig 3 is a top view of one of the

  elements appearing in fig 1.

  Fig 4 is a view similar to Fig 3

showing a variant.

  Fig 5 is a sectional elevation similar to the

  fig 1 of a development of the invention.

  Fig 6 is a section seen substantially along

line VI-VI of fig 5.

  Fig 7 is a partial sectional elevation very

  enlarged with a detail appearing in fig 5.

  Fig 8 is a partial explanatory plan.

  Fig 9 is a sectional elevation similar to

fig 1 and 5 of another variant.

  Fig 10 is a perspective of a variant.

  Fig 11 is a cross section similar to

  fig 6 implementing the variant of fig 10.

  In the drawing 1 designates circulation tubes of round section of a heat exchanger on which are threaded cooling fins 2 Preferably; the fins 2 are folded over their short sides as shown in 2 a so that the successive fins are in contact with each other to delimit guides

  at Cerals for air passing through the exchanger.

  In a manner known per se, the exchanger comprises manifold plates 3 which in the embodiment of the

  fig 1 to 8 are made of synthetic material The plates collect-

  trices 3 delimit tube passages 4 in which

  are engaged deformable collars 5 projecting from a sheet

  the or elastic plate 6 for example made of rubber The tubes 1 are forcibly engaged in the collars 5 to make

protruding above these.

  Stop elements 7 are then placed on at least some of the projecting ends of the tubes 1 The stop elements are, for example, placed on the last two rows of tubes as illustrated in FIG. 1 They could obviously be placed on all the tubes but this is generally not necessary The stop elements illustrated in fig 1 and 4 are constituted by washers for example of circular shape which

  have a hole in their center 8.

  In fig 3, radial cutouts 9 leave

  of hole 8 and extend over part of the washer.

  In fig 4, notches 10 are provided from

of hole 8.

  In both cases the washers delimit

so there legs with sharp edges -

  The stop elements can be planar but preferably they have a hemispherical shape whose convexity is turned upwards The diameter of the hole 8

  is smaller than the outside diameter of the tubes 1.

  The stop elements are force-fitted onto the ends of the tubes 1 to tighten the wall of the latter strongly at the same time as their underside deforms the

  protruding part 5 a (fig 2) of the collars 5.

  Fig 2 also shows that the peripheral edge 7 has planar stop elements advantageously presses on the top of the collecting plate 3 The sharp edges il of stop elements tend to become embedded in the wall of the tubes 1 mainly if these tubes tended to be

  moved down relative to the collector plate 3.

  This ensures that the tubes are perfect-

  ment immobilized with respect to the collector plate.

  In the embodiment described, when the stop elements 7 have been put in place, a water box 12 is mounted on the collecting plate 3 and the edge 12 a thereof is fixed, for example welded by vibration, on the

  peripheral edge corresponding to the collector plate.

  In certain cases, in order to increase the production rates, it is advantageous to bring together the manifold plates 3-water box 12 assembly before engaging the tubes 1 in the collars 5 projecting from the sheet of elastic material 6 In this case and as illustrated

  Figs 5 to 8, it is advantageous to constitute the elements

  stop elements in the form of plates 71 or 72 of FIG. 10 in which the holes 8 and the

  cutouts 9 or the notches 10-described in the foregoing.

  In FIG. 10 the plate 72 has edges. There is also advantageously provided at least one additional centering hole 13 corresponding to a stud 14 projecting from the collector plate 3. Furthermore, a notch 15 is defined in at least part of the peripheral edge of the water box 12 to cover the edge of the plate 71, for example on three sides as illustrated in 15 a in fig 8 or two sides as shown in fig 11 In addition, the inside of the box is provided

  water 12 of candles 17 corresponding to pawn 13.

  In fig II the candles can be omitted.

  When the water box is welded by vibration, the edge of the latter is welded to the edge of the collector plate and the same is true of the end

  the candle 17 which is welded to the edge 14 like the illus-

  tre fig 7 We see by the above that the plate constituting the stop element is then embedded between the

  collecting plate and the water box joined together.

  The assembly of the exchanger can then be carried out

  killed by forcing the tubes 1 of the heat exchanger bundle previously prepared, that is to say with the fins 2 into the collars 5 and the holes 8 of the stop element, the mode of action of which is then exactly same as that

described in the above.

  The above examples illustrate the implementation of the invention in the case where the collector plate is made of synthetic material The invention can be implemented

  also works when the collector plate is metal-

  In this case, the stop elements shown in the form of washers 7 are placed on the ends.

  tubes 1 exactly as described in the above.

  It may be advantageous, when the collecting plate 31 is made of metal, that the sheet 6 of flexible elastic material forming the collars 5 is placed on the face of the said collecting plate which faces the water box 12. particular case which is represented in

fig 9.

  In this embodiment, the water box can be made of synthetic material or metal and advantageously assembled to the collecting plate by mechanical means

  for example a crimping piece 18.

  The invention is not limited to the exemplary embodiments, shown and described in detail, since various modifications can be made thereto without departing from its scope.

Claims (10)

  1 Heat exchanger with tubes locked to the collector comprising fins threaded on the tubes which are themselves engaged in collars of elastic material arranged in the tube passages of a plate   collector, characterized by stop elements present   as long as at least one hole with a diameter smaller than the diameter   be outside the tubes, said stop member being forcedly forced over the protruding end in the collector plate   at least some of the tubes to which it is connected.   2 heat exchanger according to claim 1, characterized in that the stop elements have radial cuts or notches delimiting between   they legs resting on the wall of the tubes.   3 Heat exchanger according to one of the res   dications 1 and 2, characterized in that the end of the   tabs of the stop elements is on a sharp edge.   4 Heat exchanger according to one of the res-   dica Zions i to 3, characterized in that the stop elements   come in the form of washers or plates.   Heat exchanger according to one of claims 1 to 4, characterized in that the stop elements are flat or slightly hemispherical, their concavity then being turned towards the wall of the collector plate facing the water box.   6 Heat exchanger according to one of the res-   dications i to 5, characterized in that the ar-   rêt in the form of plates delimit several holes whose position corresponds to that of several passages of tube   of the corresponding collecting plate.   7 Heat exchanger according to one of the res-   dications 1 to 6, characterized by means of embedding the stop elements fixedly fixed inside the collector constituted by a collecting plate and a box   water previously joined together.   8 Heat exchanger according to one of the res-   dications 1 to 7, characterized in that the stop elements are held in a delimited groove between the collecting plate and the water box during the meeting of these two pieces.   9 Heat exchanger according to one of the res-   dications 1 to 8, characterized in that the stop element has at least one additional hole corresponding to a centering pin of the collector plate, pin which   is joined by welding to a candle of the water box.   Heat exchanger according to one of the   claims 1 to 9, characterized in that the elements   stop are threaded on tubes passing through collars of elastic material themselves held in a metal collecting plate, said collets being joined by a sheet disposed on the face of the collecting plate facing the water box.   11 Heat exchanger according to one of the   Claims 1 to 10, characterized in that the plates   forming the stop elements have fallen edges.   12 Heat exchanger according to one of the   Claims 1 to 11, characterized in that the exchanger   comprising tubes retained by stop elements   has fins with the short sides folded down to   come into contact with an adjacent fin.