MXPA97002110A - Collector plate for a ca exchanger - Google Patents

Abstract

The present invention relates to a collector plate perforated by tool elements having different dimensions for a heat exchanger for a vehicle engine, which includes the collector plate and a plurality of tubes with different dimensions, each of the tubes having ends adjusted on the collector plate, the collector plate is characterized in that it comprises: a central portion defining at least one row of holes that pass through it to receive the ends of the tubes; elements formed under pressure in said central portion, each of said press-formed elements have at least two raised elements defining an alignment direction, in which said raised elements are aligned to each other, said raised elements having predetermined respective dimensions, said raised elements being perforated individually and together by the elements of tool that have different d imperatives in at least said alignment direction for providing holes in the manifold plate of different dimensions in said alignment direction and for allowing the tubes, which have a different dimension in at least said alignment direction, to pass through said orifice;

Description

COLECTOR FOR HEAT CHANGER, MAINLY IN CAR VEHICLES The invention relates to collector plates or collectors for heat exchangers, mainly in motor vehicles, and more particularly to those which comprise in a centreline at least one row of parallel holes, suitable for receiving the ends of the tubes. The parallel holes, whose shape is adapted to the one of the tree that must be tethered, are usually made in prints, by means of perforation. In order to produce said collector, first of all it is necessary to start from a desbas + e called a medallion, which in the first stage of printing with the help of a first tool + a, in order to form a plurality of parallel patterns. In a second stage of training, it is brought to < Above the hole, one for each stamping, and whose shape and dimension are adapted to the cross section of the tubes to be introduced. The stamping done in the first stage can not correspond more than to a single tube type, whose dimensions are selected. Consequently, if it is desired to form a heat exchanger provided with tubes with substantially different dimensions, it is necessary to take a new roughing, which has not been stamped, and then stamp it with the help of a new stamping tool, in order to drill with a new die Therefore, there is no normal type collector, which can be adapted to the dimensions of tubes of different sections. Consequently, an object of the present invention is to provide a collector that does not have the drawbacks of the collectors of the prior art > r. The proposal proposes, for this purpose, a collector * for a heat exchanger of the type described in the introduction, in which each hole is formed in a pattern comprising at least two aligned impressions, of selected respective dimensions, and susceptible of being perforated individually or in combination, by means of dies of different characteristic dimensions, at least in the direction of alignment of the impressions, to allow the passage of tubes of different dimensions, at least along said direction of alignment. According to another characteristic of the invention, each impression is capable of being perforated, by means of dies of different characteristic dimensions, in a direction perpendicular to the direction of alignment of the impressions of a stamp, to allow the passage of tubes of at least two different dimensions, following this direction perpendicular to the alignment. Of + to the way, a single tool of stamping allows to form prints whose aligned impressions allow the realization of holes of different sections. A single impression will suffice for the formation of a hole of small dimensions, while two aligned and consecutive prints will allow, for example, the formation of a hole of greater dimensions, or two holes of small dimensions. Preferably, at least one of the impressions of a pattern has a dimension, following the direction of alignment, which is different from the dimension or dimensions of the other or the other impressions. In a preferred embodiment of the invention, each embossing comprises three aligned impressions, capable of being perforated either individually or in combination, to allow the passage of tubes of three different dimensions, according to the direction of alignment, and of five different dimensions of according to a direction perpendicular to said direction of alignment. In this way, starting from a normal roughing, which is stamped with the help of a single stamping tool, capable of forming in a single operation a plurality of parallel stamping, each of which comprises three aligned impressions, can be obtained, with help of dies of different shapes, at least fifteen manifolds whose holes have different dimensions. The printing also proposes a method for manufacturing a collector plate for heat exchanger, mainly for motor vehicles, comprising the following steps: providing a slab comprising a flat central part; - stamping said central part of the blank so as to comprise a plurality of patterns parallel to each other and each of which comprises at least two aligned impressions of selected respective dimensions; and perforating at least one of the impressions of each stamp of said plurality of stamps, individually or in combination, so as to obtain holes of dimensions adapted for perrni + go the passage of ends of tubes of different dimensions, according to the minus the alignment direction. In the description that follows, which is given by way of example, reference is made to the accompanying drawings, in which: Figure 1 is a perspective view of a part of a manifold according to the invention, in a re and gone; Figure 7 is a cross-section taken along line il-II of the collector of Figure 1; Figure 3 is a cross-sectional view taken along the line III-III of the collector of Figure 1; - the figure is a cross-sectional view taken along line IV-IV of the collector of figure 1; and the figure is a view in longitudinal section, turned along the axis VV of the collector of figure 1. A heat exchanger generally comprises one or two fluid boxes (not shown) in which the ends of metallic tubes 1 open ( see figure 5), and that form a bundle of tubes spaced by fins. These tubes are generally kept parallel to each other by means of a collector plate 2 (or collector) which also forms the lid of the fluid box. The collector plate? it comprises, on the one hand, a central portion called "bottom" and, on the other, on the whole periphery of its central part, a peripheral edge formed 4, for example by folding, which limits a neck 5 in U, constituted to accommodate a peripheral heel formed in the periphery of the wall forming the fluid channel. The collector plate 2 comprises, in its central part, a plurality of patches or protuberances 6-? (? = l a n, where n is the total number of prints) parallel to each other. Each print 6-? it comprises a hole 7 (in the example illustrated in figure 1 only is provided in stamp 6-3 with a hole), capable of receiving one end of tube 1. The prints, preferably are intended to house elongated tubes (so-called hereinafter flat tubes), which have a minor axis B (or width) and a major axis A (or length). Typically, the tubes are placed on the collector plate 2 parallel to the minor side or transverse side of the collector plate 2. Consequently, in the following description, the length of a section of tube 1 (or of the hole 7) will be considered. ) corresponds to a direction substantially perpendicular to the larger side (or longitudinal side) of the collector plate 2; while the width of the section of the tube 1 (or of the hole 7) corresponds to a substantial direction perpendicular to the smaller side (or transverse side) of the collector plate 2. As illustrated in figure 3, the space between two prints Consecutive is flat. According to the invention, each stamp 7 is divided into at least two standalone pieces 3 a and 8 b, each of which forms an impression. In the example illustrated in the figures, each stamp B ~? it has been subdivided into three substeps 8a to 8c. To form these prints 6-? part of a roughing whose peripheral edges 4 enclose the flat central part 3 which preferably has already, a conformation forming the U-neck 5. Then, by means of stamping with the help of a printing tool, comprising a plurality of heads of parallel stamping, each of which comprises as many aligned subparts as necessary (in the illustrated example 3) stamping the central part 3 of the blank in order to form the plurality of stamps 6-? , each of which comprises as many substarnpados (or impressions) 8 aligned, as subparts, comprises each stamping tool head. It is clear that the number of subshells (or impressions) that subdivide a pattern depends on the total number of tubes of different sections used by * a manufacturer to form the different variants of heat exchangers that Liza trade. and thus has a "precolector" (or normal roughing) that can be transformed by means of drilling to a large number of collector plates 2, adapted to receive-tubes of different sections. For example, a first type of collector 2 can be formed, wherein only the sub-patterns 8a comprise a hole 7 of length 01 (see figure 2) and of width Bl (see figure 5). In the example illustrated in FIGS. 1 and 4, the hole 7 of the pattern 6-3 is formed in all the length of three sub-braids 8a to 8c (or impressions), so that said hole has a length 03 (see FIGS. Figures 2 and 4). Obviously, numerous other variants of collector plates 2 can be provided, for example, a first variant in which the holes are formed in two consecutive sub-stages 8a and 8b, in order to accommodate tubes of length 02 (see Figure 2) or a second variant in which two rows of holes of length 01 and 04 are formed using, on the one hand, the sub-prints 8a and on the other hand the combination of consecutive sub-patterns 8b and 8c. In this last mode, two oblong tubes of substantially equal dimensions (where 01 equals 04) or different ones (where 01 can also be accommodated in the length of a box and consequently of a collector plate 2) can also be accommodated. is different from 04), which allows, for example, to form heat exchangers with a single fluid box. In the same way that one can play on the length of the holes 7, one can also play, according to the invention, along the width of the holes 7. In effect, the invention also provides that the prints 6 ?, and therefore the sub-inserts 8, have a dimension in the direction YY perpendicular to the direction of alignment XX of the sub-prints, sufficient to allow * the formation of at least two different widths of holes (see figure 5). Preferably, the patterns 7 are large enough to allow the formation of holes of five different B widths. In the example illustrated in Figure 5, only three different widths from Bl to B3 have materialized. In this way, with the help of a complete set of dies, the heads of which have different dimensions, a large number of collector plates 2, suitable for receiving tubes, can be formed from a stamped stamp according to the invention (or pre-collector). of different dimensions. This allows, on the one hand, to always have available a normal roughing (or pre-collector) model ready to be drilled according to the needs; and on the other hand, substantially reduce the production costs of the collector plates. Furthermore, it is also possible, if necessary, to adapt collectors provided with holes of a first section in collectors provided with holes of a second section in length and / or in width to the first section. In summary, in order to form a collector plate according to the invention, it is necessary to carry out the following steps: in a first step, a roughing comprising a flat central part 3 is provided; - in a second step, the central part 3 of the roughing is stamped with the help of an appropriate stamping tool, so that this central part comprises a plurality of stamps 6-? parallel to each other and each of which comprises at least two aligned impressions 8 (or sub-scabbards) of selected respective dimensions; and in a third step, at least one of the impressions 8 of each stamp of the plurality of stamps 6- is punched? carried out in the preceding stage, individually or in combination, so as to obtain holes of dimensions adapted for the introduction of the tubes 1. Once the collector plate has been formed, there is nothing left but to introduce the tubes into the holes, then to join by means of welding the external wall of said tubes to the collector plate, at the level of the die-cut impressions forming said holes. The invention is not limited to the modality described above, but covers all the variants that a person skilled in the art could develop within the scope of the following claims. Osi, the number of sub-prints (or impressions) of the same pattern could be much greater than two, and the width of the patterns could be adapted to allow more than five different hole widths.

Claims (6)

NOVELTY OF THE INVENTION CLAIMS

1. - Collection plate for heat exchanger, mainly of motor vehicle, of the type comprising a central part (3), at least one row of holes (7) suitable for receiving the ends of tubes (1), characterized said plate because each hole (7) is formed in a pattern (6-?) comprising at least two aligned impressions (8a -8c) of selected respective dimensions, and capable of being punched individually or in combination by means of dies of different characteristic dimensions by at least in the direction of alignment (XX), to allow the passage of tubes (J) of different dimensions, at least along said direction of alignment.

2. Collecting board according to claim 1, characterized in that each print (8) is capable of being * perforated by means of dies of different characteristic dimensions in a direction (YY) perpendicular to the direction of alignment (XX) of the prints of a stamping, to allow the passage of tubes of at least two different dimensions according to this direction perpendicular to the alignment.

3. Collection plate according to any of claims 1 and 2, further characterized in that at least one of the impressions (8a) has a dimension (01), following the direction of alignment, different from the one or the dimensions (02). , 03) of another (or other) impressions (8b, 8c).

4. Collection plate according to any of claims 2 and 3, further characterized in that each stamping (6-?) Comprises three aligned impressions (8a-8c) capable of being perforated individually or in combination to allow the passage of tubes ( 1) of three different dimensions, following the direction of alignment (XX) and five different dimensions following a direction (YY) perpendicular to this direction of alignment.

5. Process for manufacturing a collector plate for heat exchanger, mainly for motor vehicles, characterized in that it comprises the following steps: providing a roughing comprising a flat central part (3); stamping said central part (3) of the roughing, < 1e such that it comprises a plurality of patterns (b-i) parallel to one another and each of which comprises at least two aligned impressions (8a-8c) of selected respective dimensions; perforating at least one of the impressions (8) of each stamp (6) of the plurality of stamps, individually or in combination, so as to form holes (7) of dimensions adapted to allow the passage of ends of tubes (1) ) of different dimensions, according to at least the alignment direction (XX).

6. Method according to claim 5, further characterized in that in the stamping step the respective dimensions of the impressions are selected so that holes can be made whose dimension following the direction (YY), perpendicular to the direction of alignment ( XX) can adopt at least two different values.