MXPA97001400A - Procedure for the fixing of transversal parts in a tubular fluid box of changer of ca - Google Patents

Abstract

The partitions (6) are introduced by an open end of the tubular wall (2) of the fluid box (1), are put in place and immobilized by deformations (9) of the tubular wall, before inserting the tubes (4) and solder the assembly in a sealed manner. According to the invention, the deformations (9) are located on the outside of the region of the perimeter of the tubular region in which the openings (3) of the passage of the tubes extend, so as not to affect said openings. It has application to a condenser in a vehicle air conditioning installation

Description

"PROCEDURE FOR THE FIXATION OF CROSS-SECTIONAL PARTS IN A BOX OF TUBULAR FLUID OF HEAT EXCHANGER " The invention relates to a method for obtaining a heat exchanger, comprising at least one fluid box delimited by a tubular wall and separated into compartments by means of an intermediate transverse partition, and a plurality of parallel tubes, each of which communicates with a compartment of the fluid box by means of an opening in the tubular wall; procedure in which each partition is introduced into the tubular wall by an open end thereof, to provide it in the place it must occupy, and the partition is immobilized by deformation of the tubular wall on one side and the other of the partition. A procedure of this type is described in FR-fi-2 676 535. In this known method, the deformation of the tubular wall is carried out in the form of moldings that extend continuously over the entire circumference of the wall and, consequently, in particular in the region of the perimeter of the wall. which are openings for the passage of the tubes. It has been found that, when said openings are made before the forming of the moldings, this implies a deformation of the openings which can lead to difficulty in assembling the tubes with the fluid box and / or to imperfections of sealing. The invention mainly comprises a process of the kind defined in the introductory part, and provides that said deformation is effected exclusively in at least one region of the perimeter of the tubular wall different from that in which said openings have been formed. Surprisingly, limiting the deformation to one or more restricted regions of the perimeter does not adversely affect the correct placement of the partitions. The optional features of the invention, complementary or alternative, are listed below: the deformation is carried out in two perimeter regions arranged almost symmetrically one with the other with respect to an axial plane of the tubular wall, which passes through the centers of the openings. said two regions are almost diametrically opposed. - the deformations are quasi-punctual in the circumferential direction. the ends of the tubular wall are closed by means of terminal transverse partitions, the deformation of the tubular wall being carried out both for the terminal partitions and for the intermediate partitions. to deform the tubular wall, it sinks into the interior of the fluid box. said openings are carried out before the placement of the transverse partitions and their immobilization by deformation. the tubular wall is welded to the partition and / or to the tubes in a fluid-tight manner. The tubular wall is constituted by a rolled sheet whose two opposite edges are joined along a generatrix of the wall. The invention also aims at a heat exchanger of such a nature that it can be obtained by the method defined above, comprising at least one fluid box separated into compartments by at least one transverse partition, and a plurality of parallel tubes, each one of which communicates with a compartment of the fluid box by means of an opening thereof; the fluid box comprising a tubular wall pierced by said openings and which surrounds the edge of the partition, and deformed on one side and another of the same to immobilize it, at least in a region of its perimeter other than that in which they are made. openings The features and advantages of the invention will be set forth in greater detail in the description that follows, in which reference is made to the accompanying drawings, in which: Figure 1 is a partial view of a heat exchanger in accordance with the invention, in cross section with respect to the axis of the tubular wall? taken following the line II-II of figure 2; and Figure 2 is a partial view in axial section taken along the line II-II of Figure 1.

The partially illustrated heat exchanger, intended primarily to serve as a condenser in an air-conditioning installation in the interior of a motor vehicle, is of the type that has been described in F-R-2 676 535 and comprises a fluid box 1 whose The tubular wall 2 has a plurality of openings 3. In each of them a tube 4 is connected whose cross section is elongated in the transverse direction of the fluid box, the tubes 4 being parallel to each other and perpendicular with respect to the longitudinal direction of the fluid box. One end 5 of each of the tubes 4 is inside the fluid box 1; the opposite end can be found inside another fluid box, not illustrated, similar to the fluid box 1, and extending parallel to it. The separators, not shown, constituted by sinusoidally curved sheet metal strips, are placed in the intervals between the tubes 4 to remain in thermal contact with them. The partitions 6 extend transvently into the interior of the fluid box, that is to say, at least one intermediate partition and, if necessary, terminal partitions. Only an intermediate partition 6 can be seen in FIG. separates in two compartments 7 and 8 the fluid box. Each of the partitions 6 is immobilized in place by means of the defocuses 9 of the tubular wall 2. In the illustrated example, four deformations 9 are provided which form a protrusion towards the interior of the fluid box, for the same partition 6, two of them on the side of the compartment 7 and two on the side of the compartment 8. As seen in figure 1, each projection 9 is almost quasi-punctual in the circumferential direction of the tubular wall, and in this sense it presents a profile in Bell shape that extends in a short length of arch. On each side of the partition 6, the two deformations 9 are arranged symmetrically one with the other with respect to an axial plane P of the tubular box that passes through the centers 10 of the openings 3A and are separated one from the other almost in a serni -circuitry. The peripheral edge of the partitions 6 is welded sealingly to the inner surface of the tubular wall 2 and the external surface of the tubes is welded sealingly to the edges of the openings 3. For obtaining the heat exchanger, part of a tubular wall 2 of cylindrical shape, having a uniform internal cross section, substantially circular and large enough to allow the longitudinal sliding of the partitions 6, whose outline is also circular. The tubular wall 2 may be constituted by a rolled and assembled sheet, mainly welded, at the edges. Each of the partitions is introduced through one of the open ends of the tubular wall and slides it longitudinally until it is placed in the place it must occupy. The deformations 9 are then carried out, which immobilizes the partitions in their position. These deformations can be obtained by means of a tool that rests on the outer face of the wall 2. Then, the ends 5 of the tubes i are introduced into the fluid box 1, by means of the openings 3, which they remain abutting against the internal surface of the tubular wall 2, as shown in FIG. 1, contrary to what has been described in the aforementioned document, the openings 3 have been made here before the deformations 9 and without forming of craters towards the interior of the fluid box. Consequently, the region of the perimeter of the tubular region in which the openings 3 extend, has an arc profile of uniform circle along the entire length of the wall 2. The sealing between the outer surface of the tubes 4 and the openings 3 , on the one hand, between the edge of the partitions 6 and the inner surface of the tubular wall 2, on the other, it is obtained by welding by means of a meltable metal coating which is made to melt on heating the heat exchanger assembly. Said coating is preferably provided on the outer surface of the tubular wall 2 for its connection with the tubes, and on the partitions for its connection with the tubular wall. The presence of said coating on the inner surface of the tubular wall is avoided, which would involve causing a partial sealing of the ends of the tubes.

Claims (3)

NOVELTY OF THE INVENTION CLAIMS

1. - Process for obtaining a heat exchanger comprising at least one fluid box (1), delimited by a tubular wall (2) and divided into compartments (7,8) by means of an intermediate transverse partition (6) and a plurality of intermediate tubes (4) each of which communicates with a compartment of the fluid box by means of an opening (3) of said tubular wall; procedure in which each partition is introduced into the tubular wall by an open end thereof, to place it in the place it must occupy and the partition is immobilized by deformation of the tubular wall on one side and the other thereof; characterized in that said deformation 9 is effected exclusively in at least one region of the perimeter of the tubular wall different from that in which said openings are formed.

2. - Procedure according to claim 1 and characterized in that the deformation (9) is made in two regions of said perimeter, arranged almost symmetrically one of the other with respect to an axial plane (P) of the tubular wall passing through the centers (10) of the openings.

3. Method according to claim 2, further characterized in that the two regions are almost diametrically opposed. i * - - Method according to any of the preceding claims, further characterized by the quasi-puncture deformations in the circumferential direction. 5. - Method according to any of the preceding claims, further characterized in that the ends of the tubular wall are closed by means of transverse terminal walls; the deformation of the tubular wall being carried out both for the terminal partitions and for the intermediate partitions. 6. - Method according to any of the preceding claims, further characterized in that, to deform the tubular wall, it sinks into the interior of the fluid box. 7. - Method according to any of the preceding claims, further characterized in that said openings (3) are made prior to the placement in place of the transverse partitions and their immobilization by deformation. 8. - Method according to any of the preceding claims, further characterized in that the tubular wall is welded to the partition and / or to the tubes in a fluid-tight manner. 9. Method according to any of the preceding claims, further characterized in that the tubular wall is constituted by a rolled sheet whose two opposite edges are joined along a generatrix of the wall. 10. Heat exchanger suitable for obtaining it by the method according to any of the preceding claims, comprising at least one box of fluid (1) divided by compartments (7, 8) by means of a transverse partition (6). ) and a plurality of parallel tubes (4) each of which communicates with a container of the fluid box by means of an opening (3) thereof; the fluid box comprising a tubular wall (2) pierced by said openings and surrounding the edge of the partition, and deformed (9) on one side and another thereof, to immobilize it, at least in a region of its perimeter other than it in which said openings are formed.