FR2726076A1 - HEAT EXCHANGER WITH TUBULAR COLLECTOR BOXES - Google Patents

Abstract

The invention relates to a heat exchanger with tubular manifolds. The manifold (12) is formed of two complementary parts (56, 58) each comprising a semi-cylindrical wall (60, 64) extended by two longitudinal assembly edges (62, 66) offset radially with respect to the wall and having conjugate shapes, one of the two complementary parts being provided with slots (22) for the introduction of the ends of tubes (18) forming part of a bundle connecting the header box (12) to a similar header box. Application to heat exchangers for motor vehicles.

Description

M Heat exchanger with tubular collecting boxes The invention

  relates to a heat exchanger with tubular manifold boxes, in-classc motor vehicle. It relates more particularly to a heat exchanger of the type comprising two tubular wall and flat tube bundle collecting boxes whose ends are engaged in sealing in slots in the wall of each manifold, and in which each manifold is formed two complementary parts of generally semi-cylindrical shape, joined together by

  longitudinal edges of assembly of conjugate forms.

  It is already known, for example from US Pat. No. 5,125,454,

  heat exchangers of this type.

  In this type of heat exchanger, the beam comprises in

  in addition to corrugated spacers forming cooling fins

  and arranged between the tubes of the bundle, the assembly

  being usually soldered to the two manifolds.

  The use of tubular walls, in particular circular cylindrical walls, makes it possible to obtain manifolds that withstand high internal pressures, such as those produced by certain fluids in the case of a motor vehicle. Examples of high-pressure fluids are the charge air of a turbocharged engine, the engine lubricating oil, and the like. In a heat exchanger according to US Pat. No. 5,125,454,

  the two complementary parts of semi-general form

  cylindrical of each manifold have diameters

  different, so that one of the two complementary parts

  to adapt to the other part of the

  mentary. This results in a difficulty in positioning and maintaining the two complementary parts with each other before

brazing operations.

  This solution therefore requires complex tools

  and delicate operations to implement.

  The object of the invention is in particular to overcome these drawbacks.

  vantages. To this end, it proposes a heat exchanger of the type defined in the introduction, in which each of the two complementary parts comprises a semicylindrical wall extended by two longitudinal radially offset assembly edges.

relative to the wall.

  Thus, the position and the maintenance of the two complementary parts

  tdirb can be obtained LauiieuLL lag milk from their assembly edges, which allows to provide support

  for subsequent soldering operations.

  The collector box thus produced has a wall

  cylindrical in the broad sense, that is to say a wall generally

  parallel lines based on a closed curve that has

  preferably the shape of a circle or a similar shape.

  Advantageously, the respective assembly edges of the two complementary parts of the manifold box extend parallel to the directions of the cylinder formed by the

  meeting of these two complementary parts.

  Preferably, the two complementary parts are

semicircular section.

  In this case, the two complementary parts of section

  circular have substantially the same radius.

  According to an advantageous characteristic of the invention,

  the heat exchanger comprises a first part completed

  elementary having internal longitudinal edges offset radially inwardly to bear against the inner face of the semi-cylindrical wall of a second complementary part, while this second complementary part has external longitudinal edges offset radially outwards to bear against the outer face of the semi-cylindrical wall of the

first complementary part.

  This gives an excellent cooperation of shapes at the level of the assembly of the two complementary parts of the

collector box.

  In a preferred embodiment of the invention, the

  outer longitudinal edges of the second complementary part

  are provided with retaining lugs folded radially inwards to ensure the temporary retention of both

  Complementary pdrzies before assembly derinitii.

  As a result, the two complementary parts of the manifold are held in position for their subsequent assembly, which is advantageously carried out by soldering. It is then sufficient to make the two complementary parts from a coated sheet, preferably on both

  faces, of a suitable solder alloy.

  According to another characteristic of the invention, the slots

  are practiced in one of the two complementary parts.

  According to another characteristic of the invention, each collecting box is provided with two end walls joined to the

two complementary parts.

  In the description that follows, made only as a

  for example, reference is made to the accompanying drawings, in which: - Figure 1 is an elevational view of a tubular manifold heat exchanger according to the invention;

  FIG. 2 is an elevational view and on an enlarged scale

  die, a collector box of the exchanger of Figure 1; - Figure 3 is a sectional view along the line III-III of Figure 2; and FIG. 4 is an axial sectional view, on an enlarged scale, of one of the collector boxes of the heat exchanger.

heat of Figure 1.

  Referring firstly to Figure 1 which shows a first heat exchanger 10 and a second heat exchanger 30 according to the invention arranged contiguous or twinned and

  both having a similar structure.

  The heat exchanger 10 comprises two tubular manifolds 12 and 14 with respective axes XX and YY. Between the two manifolds 12 and 14 is mounted a beam 16 formed of a multiplicity of flat tubes 18, parallel to each other, and a multiplicity of corrugated tabs 20 forming fins and disposed between the tubes 18. These have,

  in the example, a rectangular cross section.

  The ends of the tubes 18 of the bundle are engaged, on one side, in slots 22 formed in the wall of the manifold 12 and, on the opposite side, in similar slots

  24 made in the wall of the manifold 14.

  The manifolds 12 and 14 are provided with two tubulars

  26 and 28 serving respectively the entry and the exit

  of a first fluid, as shown by arrows F1 and F2.

  For example, the first fluid is overflow air

  turbocharged engine to be cooled by a flow of air sweeping outside the tubes 18 and the

spacers 20 of the beam 16.

  The heat exchanger 30 comprises two manifolds 32 and 34 respectively contiguous to the manifolds 12

  and 14 and aligned with them.

  Thus, the manifold 32 is aligned axially with the manifold 12, while the manifold 34 is

  aligned axially with the manifold 14.

  The manifolds 32 and 34 are also joined by the bundle 16, the ends of the tubes 18 being engaged, on one side, in slots 36 of the manifold 32 and,

  on the opposite side, in slots 38 in the collector box.

this 34.

  In addition, the manifolds 32 and 34 are provided with an inlet pipe 40 and an outlet pipe 42 serving respectively to the inlet and the outlet of a second fluid,

  highlighted by the arrows r. e..4.

  By way of example, this second fluid may be lubricating oil of an engine, which must be cooled by

  heat exchange with a flow of air.

  It will be understood that it is the same airflow that can

  cool the first fluid and the second fluid that passes through

  respectively the first heat exchanger 10 and the

second heat exchanger 30.

  As seen in Figure 1, the pipes 26 and 28 are secured to two end walls 44 and 46 forming part of the manifolds 12 and 14, while the pipes 40 and 42 are integral with two end walls 48 and 50

  forming part of manifolds 32 and 34.

  In addition, two walls 52 and 54, forming partitions, are respectively interposed between the manifolds 12

  and 32 and between the manifolds 14 and 34.

  Thus, the circulation circuits of the first fluid and the

  second fluid are completely separated.

  Referring now to Figures 2 and 3 to describe more particularly the structure of the manifold 12, note being made that the structure of the other boxes

  collectors 14, 32 and 34 is similar.

  The manifold 12 is formed of two complementary parts

  56 and 58 of generally semi-cylindrical shape which, when combined, have substantially the shape of a cylinder

circular axis XX.

  Part 56 comprises a circular semi-cylindrical wall 60 of axis XX and inner radius R, which extends over a little more than 180 (FIG. 3). The wall 60 is extended by two longitudinal assembly edges 62, forming two narrow strips, and decal radially inwards by rzrt to the wall 60. The two longitudinal edges 62 extend in directions parallel to the generatrices of the cylinder

  of axis XX and each have an external face of

  cylindrical and substantially having the radius R. The two assembly edges 62 are intended to cooperate with the complementary portion 58 and serve at the same time abutment

in translation for the tubes 18.

  Part 58 comprises a semicylindrical wall 64 of circular section and radius R which extends over a little less

180 (Figure 3).

  In the wall 64 are formed the slots 22 for receiving the ends of the tubes 18, while the wall 60

of part 56 is not perforated.

  The wall 64 is extended by two longitudinal edges of assembly.

  66 offset radially outward and realized

  in the form of two narrow bands running parallel-

  the direction of the cylinder of axis XX.

  The inner face of the assembly edges 66 is able to bear against the external face of the wall 60, in the region of this wall which is immediately adjacent to the

assembly edges 62.

  The longitudinal edges 66 of the portion 58 are each provided with two retaining tabs 70 (FIGS. 2 and 3) which are folded radially inwards to provide provisional retention of the two complementary parts 56 and 58.

once assembled.

  The tabs 70 are slightly folded inwards and thus provide an elastic bearing force which tends to maintain contact between the assembly edges 62 and the

  wall 64 and between the assembly edges 66 and the wall 60.

  The complementary parts 56 and 58 are formed advantageously

  3 - -a tal! metal usur each of

its faces, an alloy of solder.

  The slots 22 are preferably made in the thickness of the wall of the portion 58 previously shaped to the desired shape. Because the complementary parts 56 and 58 can be

  between them, in their correct position of assem-

  then simply switch the heat exchanger

  furnishing the liaison between the two complementary parties

  56 and 58 and also ensure the connection of the manifolds to the bundle 16, i.e. to the tubes 18 and

inserts 20.

  Referring now to Figure 4 which shows more particularly the structure of the two collector boxes 12

and 32 aligned along the axis XX.

  The end wall 44 is generally circular in shape and is internally lined with a counter-plate 72 of circular shape, and of smaller diameter. These structures facilitate the temporary retention of the wall

end 44 before soldering.

  As can be seen in FIG. 4, the tubing 26 passes through two aligned holes 74 and 76 made respectively through the wall 44 and against the plate 72. The tubing 26 comprises two spaced beads 78 and 80 extending respectively from both sides of the partition 44 and against the plate 72 to ensure the maintenance of these three

elements between them.

  The end wall 48 is provided internally with a

  against-plate 82 similar to the counterplate 72.

  In addition, the intermediate partition wall 52 is provided with

  two opposing counter-plates 84 and 86 facilitating the assembly.

  two collecting boxes 12 and 32 in the extension

from each other.

  The exchanger of FIG. 1 can easily be made by brazing, its constituent parts being maintained between

  they during the passage to the brazing furnace.

  Of course, the invention is not limited to a heat exchanger, of the double type, as represented only as a

example in Figure 1.

  Thanks to the invention, the slots made in the walls of the manifolds can be easily made with a simplified tool, since the machining of the slots takes place on a semicylindrical part and not on a

cylindrical piece.

  The invention finds particular application to

  heat exchangers for motor vehicles.

Claims (9)

claims   1.- heat exchanger comprising two collector boxes (12,14) with tubular walls and a bundle (16) of flat tubes (18) whose ends are engaged in sealing in slots (22,24) formed in the wall of each collecting box, and in which each collecting box (12) is formed of two complementary parts (56, 58) of generally semi-cylindrical shape joined together by   longitudinal edges of assembly (62,66) of   characterized in that each of the two complementary parts (56,58) comprises a semi-cylindrical wall (60,64) extended by two longitudinal assembly edges   (62,66) radially offset from the wall.   2. Heat exchanger according to claim 1, characterized   in that the connecting edges (62, 66) of the two complementary parts (56, 58) extend parallel to the directions of the cylinder formed by the union of the two parts. complementary.   3. Heat exchanger according to one of claims 1 and   2, characterized in that the two complementary parts (56,58) are circular in section.   4. Heat exchanger according to claim 3, characterized   in that the two complementary parts (56,58) of   circular section have substantially the same radius (R).   5.- heat exchanger according to one of claims 1 to   4, characterized in that a first complementary part (56) comprises two inner longitudinal edges (62) radially inwardly offset to bear against the inner face of the semicylindrical wall (64) of a second complementary part ( 58), while this second complementary part (58) comprises two external longitudinal edges (66) offset radially outwards in order to bear against the outer face of the semi-cylindrical wall   (60) of the first complementary part (56).   6. Heat exchanger according to claim 5, characterized   in that the outer longitudinal edges of the second complementary part (58) are provided with holding tabs (70) folded radially inwards to ensure the temporary maintenance of the two complementary parts (56, 58). before their final assembly.   7.- heat exchanger according to one of claims 1 to   6, characterized in that the two complementary parts   (56,58) are assembled together by brazing.   8. Heat exchanger according to one of claims 1 to   7, characterized in that the slots (22) are made in   one (58) of the two complementary parts.   9. Heat exchanger according to one of claims 1 to   8, characterized in that each manifold (12) is provided with an end face (52.) joined to both supplementary parts (56,58).