FR3090844A1 - Collector box and heat exchanger for cooling and / or heating and / or ventilation and / or air conditioning installation - Google Patents

Abstract

The manifold and heat exchanger for cooling and / or heating and / or ventilation and / or air conditioning The invention relates to a manifold (7) for heat exchanger (1) comprising at least two tubes (5). The manifold (7) has a manifold (9) and a cover (11) assembled to close the manifold (7). According to the invention, the collector (9) is made in at least three parts. A first part (91), fixed to the cover (11), has a plurality of orifices (911) configured to receive the ends of the tubes (5). A second part (92), disposed against the first part (91), has at least one opening (921). A third compressible part (93), arranged at least partly in said at least one opening (921) of the second part (92), is configured to be arranged around the ends of the tubes (5). The second part (92) is made of a more rigid material than the third part (93). The invention also relates to a heat exchanger (1) comprising such a manifold (7). Figure for the abstract: Figure 1

Description

Description

Title of the invention: Collector box and heat exchanger for cooling and / or heating and / or ventilation and / or air conditioning installation

The present invention relates to a heat exchanger for a cooling and / or heating and / or ventilation and / or air conditioning installation of a motor vehicle. The invention relates in particular to manifolds for such heat exchangers. The invention also relates to a heating and / or ventilation and / or air conditioning installation comprising such a heat exchanger.

Heat exchangers conventionally comprise a heat exchange bundle and at least one, generally two manifolds of a heat transfer fluid.

The heat exchange bundle generally includes a plurality of tubes through which is intended to flow a heat transfer fluid. A second fluid, such as an air flow, can pass through the heat exchange beam by flowing between the tubes.

In known manner, each manifold comprises a manifold receiving the ends of the tubes. A cover covers the collecting plate to close the collecting box. The manifolds allow the distribution or recovery of the heat transfer fluid which passes through the tubes of the heat exchange bundle.

According to a known solution, the different elements of the heat exchanger are mechanically assembled together, namely at room temperature, for example by crimping, expansion, clipping or other mechanical connection. In particular, each collector plate can be provided with mechanical fixing means, for example crimping, capable of cooperating with a peripheral rim of the cover which is fixed on the collector plate by ensuring the compression of a seal placed on the collector plate.

In addition, the ends of the tubes are assembled to each header plate by flaring the ends of the tubes so as to compress the seal between the ends of the tubes and the header plate. The gasket provides sealing between the cover and the collector plate but also between the ends of the tubes and the collector plate. In addition, the seal can compensate for expansion and retraction phenomena that may occur.

In addition, the header plates must meet mechanical strength criteria, for example during crimping on the cover and pressure and endurance constraints. For this, metal collecting plates are preferably used, in particular aluminum or aluminum alloy.

[0008] Furthermore, to improve the performance of such heat exchangers, there is a need to increase the number of tubes.

However, in known mechanical assembly heat exchangers, the header plate is usually provided with collars through which the ends of the tubes pass. When assembling the tubes to the manifold, the seal is then compressed between the collars and the flared ends of the tubes, to seal each of the tubes in the bundle.

The number of tubes passing through the collector plate is therefore limited by the thickness of the collars, and even more so when the collector plate and its collars are metallic.

In addition, it proves difficult to succeed in producing collars for an exchanger whose tubes are implanted with a tight tube pitch, for example of the order of a millimeter.

The invention therefore aims to at least partially overcome these problems of the prior art by providing a manifold for heat exchanger to improve thermal performance while meeting the constraints of pressure and endurance and reducing the risk of leakage.

To this end, the invention relates to a manifold for a heat exchanger comprising at least two tubes, in particular for a motor vehicle, the manifold comprising a manifold and a cover assembled to the manifold so as to close the manifold. According to the invention, the collector is made in at least three parts. The manifold comprises a first part fixed to the cover and having a plurality of orifices configured to receive the ends of the tubes, in the assembled state of the heat exchanger. The collector further comprises a second part disposed against the first part and having at least one opening, so as to be crossed by the ends of the tubes. The manifold also comprises a third compressible part arranged at least partly in said at least one opening of the second part and configured to be arranged around the ends of the tubes opening into the manifold in the assembled state of the heat exchanger. The second part is made of a more rigid material than the third part.

The outline of each opening of the second part is intended to form an obstacle or a stop for the third part forming a seal intended to be arranged around the ends of the tubes. This arrangement makes it possible to limit the free volume of the seal around the ends of the tubes, when the latter are deformed, for example by flaring, when assembling the heat exchanger, to compress the third part around the ends of the tubes. .

The manifold can further include one or more of the following characteristics, taken separately or in combination.

The first part forms a header plate. The second part forms a skeleton. The third part forms a seal.

According to one aspect of the invention, said at least one opening of the second part is arranged in alignment with at least two orifices of the first part.

According to another aspect of the invention, the third part comprises at least one portion arranged in said at least one opening of the second part and has at least two orifices arranged opposite said at least two orifices. the first part.

The orifices of the first and third parts are advantageously of shape complementary to the shape of the tubes, for example of generally circular shape, so as to conform to the shape of the tubes during the assembly of the heat exchanger.

Or the openings of the second part may be of elongated shape, for example of generally oblong shape.

The collector may have a generally elongated shape extending mainly along a longitudinal axis. Each opening of the second part extends, for example transversely to the longitudinal axis of the collector.

According to an exemplary embodiment, the third part has a peripheral belt arranged against the first part surrounding the second part. The peripheral belt is configured to be compressed on the one hand between the cover and the first part, and on the other hand between the cover and the second part, in the assembled state of the manifold.

The cover may have on its periphery a heel fixed to the first part of the collector.

According to another aspect of the invention, the second part of the collector forms a stop for the heel of the cover.

The third part can be molded onto the second part. The second part is advantageously made of a material of the same family as the material of the third part to facilitate overmolding. The third part is for example made of an elastomeric material. The second part is for example made of a plastic material.

Alternatively, the second part can be metallic, for example aluminum.

The collector and the cover can be assembled by crimping. The first part of the collector comprises for example on its periphery assembly means, such as crimping teeth which come to bend on a heel of the cover.

According to an advantageous embodiment, the first part is made of a metallic material, preferably aluminum, to guarantee the mechanical strength, for example for assembly by crimping to the cover of the manifold.

The invention also relates to a heat exchanger, for a cooling installation and / or heating and / or ventilation and / or air conditioning of a motor vehicle, said exchanger comprising a heat exchange bundle comprising at least two tubes arranged with a pitch between the tubes less than or equal to 1mm, and at least one manifold as defined above into which said tubes open.

It can be in particular a radiator.

According to one aspect of the invention, the heat exchanger is mechanically assembled. The bundle may have fins and the tubes may be joined to the fins by expansion. The ends of the tubes can be flared so as to compress the third part to ensure sealing.

The tubes may have after expansion an external diameter of the order of 2.2mm, and an internal diameter around 2mm. The tubes are of circular or substantially circular section.

According to another aspect of the invention, the tubes are made of a metallic material, advantageously aluminum or an aluminum alloy.

The invention also relates to a cooling and / or heating and / or ventilation and / or air conditioning installation comprising at least one heat exchanger, as defined above.

Other advantages and characteristics of the invention will appear more clearly on reading the following description given by way of illustrative and nonlimiting example, and of the appended drawings among which:

[Fig.l] shows a sectional view of a heat exchanger comprising a heat exchange bundle and a manifold comprising a three-part manifold according to the invention.

[Fig.2] is a perspective and partial view showing a first part of the collector.

[Fig.3] is a perspective and partial view showing a second part of the collector.

[Fig.4] is another perspective and partial view showing a third part of the manifold molded onto the second part of Figure 3.

In these figures, identical elements have the same reference numbers.

The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the characteristics apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

In the description, it is possible to index certain elements, such as for example the first element or the second element. In this case, it is a simple indexing to differentiate and name similar but not identical elements. This indexing does not imply a priority of one element over another and one can easily interchange such names without departing from the scope of this description. This indexing does not imply an order in time either.

Figure 1 schematically shows a heat exchanger 1 for a cooling installation and / or heating and / or ventilation and / or air conditioning of a motor vehicle. It may in particular be a radiator, such as a radiator for heating the passenger compartment of the motor vehicle.

The heat exchanger 1 conventionally comprises a heat exchange bundle 3 comprising at least two tubes 5, generally a plurality of tubes 5, arranged in one or more rows of tubes 5, and at least one manifold 7 at a end of the heat exchange bundle 3, generally two manifolds 7. The tubes 5 can be mounted between the two manifolds 7. In the example shown diagrammatically in FIG. 1, only one manifold 7 is shown, and only one end tubes 5 is visible. The manifold (s) 7 make it possible to distribute a first fluid to the tubes 5 or to collect the first fluid that has passed through these tubes 5.

The tubes 5 are intended to be traversed by the first fluid. A second fluid, such as an air flow, is intended to pass through the heat exchange bundle 3 to thermally exchange with the first fluid. In order to improve the heat exchanges, the heat exchange bundle 3 may possibly include heat exchange elements 6, such as fins, of which only a few are shown in FIG. 1.

The tubes 5 can extend longitudinally along a longitudinal axis L5. These tubes 5 are further arranged with a pitch between the tubes very tight, in particular less than or equal to 1mm.

The tubes 5 are made of a metallic material, for example aluminum.

The heat exchanger 1 can be in particular with mechanical assembly. In this case, the heat exchange bundle 3 can be assembled mechanically. To do this, the tubes 5 can be assembled by expansion or crimping with fins.

The heat exchange bundle 3 can also be assembled mechanically to the or each manifold 7. To do this, the ends of the tubes 5 opening into the manifold 7 can be deformed plastic, for example by flaring. The flaring of the ends of tubes 5 is for example carried out by punching these ends. It is possible to provide for flaring at least locally the ends of the tubes 5. The ends of the tubes 5 thus each have a flare 51 which bears against a manifold 9 of the manifold 7, described in more detail below, in the internal volume of the manifold 7.

The tubes 5 are advantageously very thin. Before expansion and flaring, the tubes 5 have, for example, an internal diameter around 1.8 mm and an external diameter around 2 mm. After expansion, for assembly with fins for example, the magnification of the tubes 5, that is to say the increase in their diameter, may be small, for example of the order of one tenth or two tenths of a millimeter . By way of nonlimiting example, the external diameter of the tubes 5 is less than or equal to 2.2mm. The internal diameter is for example around 2mm. Similarly, after flaring, for assembly to each manifold 7, the increase in the diameter of the tubes 5, can again be of the order of one tenth or two tenths of a millimeter. The diameter of the ends of the tubes 5 at the flares 51 is greater than the diameter of the tubes 5 at the heat exchange bundle 3 outside of the manifolds 7.

The invention relates more particularly to the manifold 7.

The manifold 7 comprises a manifold 9 intended to be crossed by the ends of the tubes 5 in the assembled state of the heat exchanger 1, and a cover 11 assembled to the manifold 9 so as to close the manifold 7.

The cover 11 may have a general shape of an arch.

The manifold 9 has for example a generally elongated shape extending mainly along a longitudinal axis L9 (see Figures 2 to 4). This manifold 9 can be arranged transversely with respect to the tubes 5, as shown diagrammatically in FIG. 1. The manifold 9 is intended to be crossed by the ends of the tubes 5, so as to allow the assembly of the tubes 5 to the manifold 7 The manifold 9 is further configured to receive one or more rows of tubes 5, each row extending along a transverse axis T of the manifold 9, which is perpendicular to the longitudinal axis L9 (not visible in FIG. 1).

More specifically, the collector 9 is produced in at least three parts, namely a first part 91, a second part 92 and a third part 93.

The first part 91 forms the interface with the tubes 5. It is therefore interposed, in the assembled state of the heat exchanger 1, between the second and third 92, 93 parts of the manifold 9 and the rest of the bundle heat exchange 3 extending out of the manifold or boxes 7.

The first part 91 has for example a general form of plate. It acts as a collecting plate for the ends of the tubes 5.

The first part 91 has a plurality of holes 911 configured to receive the ends of the tubes 5. The shape of these holes 911 is complementary to the shape of the ends of the tubes 5, for example before flaring. The orifices 911 are for example of generally circular or substantially circular shape, as illustrated in FIGS. 1 and 2. These orifices 911 are shaped so as to conform to the shape of the tubes 5 to the assembly of the heat exchanger 1. According to the illustrated example of the first part 91 in the form of a plate, the orifices 911 are arranged in several rows in the direction of the width of the plate, along the transverse axis T.

The first part 91 allows the assembly of the manifold 9 to the cover 11. To this end, the first part 91 comprises assembly means, in particular mechanical, such as tabs or crimping teeth 913. The crimping teeth 913 are in this example provided on the periphery of the first part 91. In a complementary manner, the cover 11 may have on its periphery a heel 111 or foot of the cover, on which the crimping teeth 913 can be folded down when the assembly of the heat exchanger 1. The first part 91 is thus fixed to the cover 11 in the assembled state of the manifold 7. The term "heel" means the lower part of the cover 11, with reference to the orientation of the elements on Figure 1. This heel 111 is located on the side of the heat exchange bundle 3 in the assembled state of the heat exchanger 1. The cover 11 may have a shoulder 113 so that the heel 111 is offset from the lid arch 11.

In addition, the first part 91 may have a peripheral edge 915 having the fixing means, such as crimping teeth 913. In this example, the plate forming the first part 91 can be folded over its periphery to form the peripheral border 915.

The first part 91 is advantageously made of a metallic material, for example aluminum or an aluminum alloy. Such a metal part gives the mechanical strength necessary for the collector 9 to crimp the collector 9 to the cover 11.

In particular, the first part 91 can be produced in the form of a flat plate, that is to say without peripheral groove, peripheral groove or the like. It is also devoid of a collar. In other words, the first part 91 may comprise a core 917 (FIG. 2) substantially planar and devoid of collar, on which the orifices 911 are formed and relative to which the peripheral edge 915 is raised.

Referring to Figures 1 and 2, the first part 91 can thus be produced in a simple manner by a plate having holes 911 for example punched in which the tubes 5 can be crimped, by flaring, so as to block the tubes 5 in translation, along the longitudinal axis L5 of the tubes 5, after assembly of the tubes 5 to the manifold 7.

The second part 92 of the collector 9 is a separate part from the first part 91 forming a collector plate, before assembly of the collector 9.

The third part 93 is a compressible part so as to act as a seal intended to be arranged around the ends of the tubes 5 opening into the manifold 7, in the assembled state of the heat exchanger 1. When the ends of the tubes 5 are deformed, for example flared, the third part 93 around the ends of the tubes 5 is compressed. The seal between the tubes 5 and the manifold 9 is ensured by this compression.

The second part 92 is made of a more rigid material than the third part 93 of the manifold 9 and acts as a skeleton on which the third part 93 can advantageously be molded.

The second and third parts 92, 93 after assembly, for example by overmolding, can form a composite part. Such a solution makes it possible to limit the number of parts to be handled when assembling the manifold 9 and the manifold 7 with the heat exchange bundle 3.

The materials of the second part 92 and the third part 93 are advantageously part of the same family of materials, in order to facilitate the molding of the third part 93 on the second part 92. The second part 92 or skeleton can be in a plastic material. A material that is resistant to the temperatures of use of the heat exchanger 1 is preferably chosen. An example may be a polyamide filled with glass fibers. The third part 93 can be made of an elastomeric material, such as an ethylene-propylene-diene monomer known by the acronym EPDM. The material of the third part 93 can be chosen with a hardness around 50 or 60 Shore.

According to an alternative, it can be envisaged that the material of the second part 92 is metallic, for example aluminum. In this case, the third part 93 is not molded onto the second part 92, and the second and third parts 92, 93 can be assembled by any other suitable means.

The second and third parts 92, 93 are fully received inside the manifold 7 in the assembled state, between the first part 91 and the cover 11. The second and third parts 92, 93 are not not extend out of the manifold 7, beyond the first part 91 in the direction of the tubes 5, for example via the orifices 911. Neither the second part 92 nor the third part 93 have any material, such as a collar, s extending in the orifices 911 of the first part 91 in the direction of the tubes 5 of the heat exchange bundle 3.

Referring to Figure 3, the second part 92 or skeleton of the manifold 9 has at least one opening 921. In this example, the second part 92 has a generally perforated parallelepiped shape extending mainly along the longitudinal axis L9 of the collector 9. Several openings 921 are shown in the example of FIG. 3. They are more precisely elongated openings 921, for example of generally oblong shape, and extending transversely (along the transverse axis T ). Such openings 921 therefore extend in the width direction and not in the length of the second part 92 forming a skeleton.

When assembling the manifold 9, as shown diagrammatically in FIG. 1, the second part 92 is arranged against the first part 91. It is more precisely interposed between the first 91 and third 93 parts.

Each opening 921 of the second part 92 is arranged in alignment with at least two orifices 911 of the first part 91, more precisely, of a transverse row of orifices 911 of the first part 91.

The third part 93 is in turn arranged at least partially in the openings 921 of the second part 92, so as to be arranged around the ends of the tubes 5 opening into the manifold 7 in the assembled state of the 'heat exchanger 1. More specifically, the third part 93 comprises at least one portion arranged in a corresponding opening 921 of the second part 92. This portion of the third part 93 has at least two orifices 931. In the example illustrated on the FIG. 4, five orifices 931 are shown purely by way of illustration without limitation. When the manifold 9 is assembled (see FIG. 1), these orifices 931 are aligned with, arranged opposite, corresponding orifices 911 of the first part 91. The orifices 931 of the third part 93 are of complementary shape in the shape of the tubes 5, for example of generally circular shape. Once assembled, the manifold 9 can thus be traversed by the tubes 5, which pass through the aligned holes 921, 931. In detail, the tubes 5 are assembled to the manifold 7 so as to pass through the first part 91, and the third part 93 which is located in the openings 921 of the second part 92. There are as many orifices 931 on the third part, that of holes 911 on the first part 91, and therefore of tubes 5, when the heat exchanger 1 is assembled.

The third part 93 is also arranged over the entire surface of the second part 92. The third part 93 may for this purpose have a base 933 (better visible in FIG. 4) which can be molded over the entire surface of the second part 92 opposite the surface coming against the first part 91. This base 933 is configured to come and surround the ends of tubes 5 (not visible in FIG. 4) when the heat exchanger 1 is assembled, and comprises at this effect the holes 931.

The third part 93, and more particularly its base 933 provided with the orifices 931, is intended to be compressed during the flaring of the ends of the tubes 5, also referring to FIG. 1. When they are flared, the ends of the tubes 5 form support zones against the third part 93 of the manifold 9, which makes it possible to compress the third part 93 to guarantee sealing between the manifold 9 and the tubes 5.

On the one hand, the material of the third part 93 is compressed between the ends of the tubes 5 and the second part 92. The latter thus forms an obstacle providing the rigidity necessary to compress the third part 93 forming a seal. . Indeed, such an obstacle makes it possible to prevent the material, such as the elastomer, of the third part 93 from being fined, which would have the drawback of limiting the compression around the tubes 5 posing possible sealing problems. In other words, the openings 921 receiving the third part 93, make it possible to limit the free volume of the elastomer which deforms when the ends of the tubes 5 are flared.

On the other hand, in the assembled state of the heat exchanger 1, the second part 92 is not present between two adjacent tubes 5 of a row, along the transverse axis T of the manifold 9. In in this case, the end of each tube 5 acts as such an obstacle, for the material, such as the elastomer, which is located around the ends of the adjacent tubes 5, along the transverse axis T, during the flaring of the ends of the tubes 5.

In addition, to guarantee this compression of the third part 93 between the flared ends of the tubes 5, the third part 93 advantageously has a reserve of material between two orifices 931 along the transverse axis T, that is to say say an amount or a surplus of material with respect to the pitch of tube which will be compressed between the ends of the tubes 5. The volume of material forming a seal is greater than the transverse space between the tubes 5, and when flaring the ends of the tubes 5, this surplus material is clamped around the tubes 5 ensuring the seal.

The third part 93 may further include a peripheral belt 935 shaped to follow the periphery of the first part 91 of the manifold 9. It can be arranged against the first part 91 by surrounding the second part 92. The base 933 having the orifices 931 and the peripheral belt 935 can be formed in one piece. Thus, the entire free surface of the second part 92 which does not come against the first part 91 is covered and surrounded by the third part 93 and thus forms the rigid skeleton inside the third part 93.

The peripheral belt 935 is configured to be compressed between the cover 11, more specifically the heel 111, and the first part 91. Thus, the third part 93 also provides a sealed connection between the cover 11 and the first part 91 forming collector plate. The base 933 of the third part 93 can be raised relative to the peripheral belt 935.

During crimping, the crimping teeth 913 are folded down on the heel 111 which bears against the peripheral belt 935 disposed between the cover 11 and the first part 91. In order to resist the crimping force, transverse, diagrammatically by arrow F in FIG. 1, the second part 92 of the manifold 9 also forms a stop, along the transverse axis, for the heel 111 of the cover 11. In other words, the stop is provided by the rigid skeleton covered with the seal sealing preferably by overmolding. The third part 93 forming a seal is thus also located between the cover 11 and the second part 92, in the assembled state of the manifold 7.

The second part 92 is sufficiently rigid to resist the thrust of the third part 93 forming a seal when it is compressed to seal around the ends of the tubes 5, as well as the thrust of the cover 11 during the fixing of the first part 91 forming a collector plate to the cover 11. In addition, the shape, for example parallelepiped of the second part 92, is provided thick enough to oppose the transverse crimping force E.

Finally, none of the three parts 91, 92, 93 of the manifold 9 has a collar bordering the orifices or openings. The collector 9 obtained by the assembly of the three parts 91, 92, 93 is therefore devoid of collar, which makes it possible to guarantee a tight pitch between the tubes 5.

Thus, the assembly for example by molding of the second and third parts 92, 93 provides a composite part, which can in turn be assembled with the first part 91, so as to obtain a manifold 9 with three materials, one (first part 91) metallic allowing the cover 11 to be crimped and to resist stresses, one (third part 93) for example made of elastomer making it possible to seal, and one (second part 92), for example plastic giving sufficient rigidity for the compression of the elastomer around the tubes 5, and thus making it possible to respect a tight pitch of tubes 5.

The assembly of a heat exchanger 1 as described above with reference to all of the figures, can be carried out as follows. The tubes 5 can be secured to the fins 6, for example by expansion. The tubes 5 are inserted into the manifolds 9, via the holes 911, 931. By way of nonlimiting example, the tubes 5 can for example be inserted into the holes 911 of the first part 91 of the manifold 9 before the insertion of the composite part formed by overmolding of the third part 93 forming a seal on the second part 92 forming a skeleton.

The ends of the tubes 5 can then be deformed, for example flared, to compress the third part 93 of the manifold 9 between the tubes 5 and a second part 92 forming a skeleton and sealing. Mechanical retention between the heat exchange bundle 3 and each collector 9 is ensured by this deformation of the tubes 5, produced for example by flaring. The second part 92 forming a rigid skeleton ensures effective compression of the third part 93 forming a seal. During flaring, the diameter of the tubes 5 is increased on the internal side of the manifold 9, that is to say on the side of the manifold 9 intended to face the cover 11. The position of the manifold 9 is thus locked in relation to the tubes 5 of the heat exchange bundle 3.

Then, the cover 11 can be put in place on the collector 9, so that the heel 111 is housed in the space delimited between the peripheral edge 915 folded back from the first part 91 forming a collector plate and the peripheral belt 935 of the third part 93 of the manifold 9. The assembly of the cover 11 can be done, for example by crimping by folding down the crimping teeth 913 of the first part 91, which ensures the compression of the peripheral belt 935 of the third part 93 of collector 9.

It is therefore understood that with such a manifold 7, and in particular a tri-material manifold 9 as described above, it is possible to tighten the pitch of the tubes 5 while meeting the mechanical strength requirements, in particular for crimping.

Claims (1)

Claims [Claim 1] Collector box (7) for heat exchanger (1) comprising at least two tubes (5), in particular for a motor vehicle, the collector box (7) comprising a collector (9) and a cover (11) assembled to the collector (9) of so as to close the manifold (7), characterized in that: - The collector (9) is made in at least three parts, a first part (91) fixed to the cover (11) and having a plurality of orifices (911) configured to receive the ends of the tubes (5) in the state assembled from the heat exchanger (1), a second part (92) disposed against the first part (91) and having at least one opening (921) so as to be traversed by the ends of the tubes (5), and a third compressible part (93) arranged at least partly in said at least one opening (921) of the second part (92) and configured to be arranged around the ends of the tubes opening into the manifold in the assembled state of the 'heat exchanger (1), and in that - The second part (92) is made of a more rigid material than the third part (93). [Claim 2] Collector box (7) according to the preceding claim, wherein said at least one opening (921) of the second part (92) is arranged in alignment with at least two orifices (911) of the first part (91), and in which the third part (93) comprises at least one portion arranged in said at least one opening (921) of the second part (92) and having at least two orifices (931) arranged opposite said at least two orifices ( 911) of the first part (91). [Claim 3] Collector box (7) according to one of the preceding claims, in which the third part (93) has a peripheral belt (935) arranged against the first part (91) surrounding the second part (92), the peripheral belt (935 ) being configured to be compressed between the cover (11) and the first part (91), and between the cover (11) and the second part (92), in the assembled state of the manifold (7). [Claim 4] Collector box (7) according to any one of the preceding claims, in which the cover (11) has on its periphery a heel (111) fixed to the first part (91) of the collector (9), and in which the second part (92) of the collector (9) forms a stop for the heel (111) of the cover (11). [Claim 5] Collector box (7) according to any one of the preceding claims, in which the third part (93) is molded onto the second part (92). [Claim 6] Collector box (7) according to the preceding claim, wherein the third part (93) is made of an elastomeric material. [Claim 7] Collector box (7) according to any one of the preceding claims, in which the second part (92) is made of a plastic material. [Claim 8] Collector box (7) according to any one of the preceding claims, in which the first part (91) is made of a metallic material. [Claim 9] Collector box (7) according to any one of the preceding claims, in which the first part (91) comprises a generally planar core (917), devoid of a peripheral groove. [Claim 10] Heat exchanger (1), for a cooling and / or heating and / or ventilation and / or air conditioning installation of a motor vehicle, said exchanger (1) comprising a heat exchange bundle (3) comprising at least two tubes (5) arranged with a pitch between the tubes (5) less than or equal to 1mm, characterized in that said exchanger (1) comprises at least one manifold box (7) according to any one of the preceding claims in which said tubes (5) open out . 1/2