FR2706996A1 - - Google Patents

Abstract

The invention relates to a heat exchanger, of the type comprising a water box (1) divided by a partition (5) into two chambers interconnected by tubes (81, 82), this partition being pierced with a light (2). normally closed by a valve (4). The slot (2) is surrounded, on one side of the partition (5), by an inclined bearing surface, while the valve comprises a resilient blade (4) in the form of a T whose core is homologous to this bearing surface, and the branches of which are taken in the thickness of the partition (5), so as to prestress the core of the T on said bearing surface. Application to motor vehicles.

Description

The invention relates to heat exchangers for motor vehicles,

  especially intended to serve as cooling radiators. It is known that an exchanger comprises one or more water boxes interconnected by tubes provided with cooling fins. In some exchangers, called "multiple passes", the water box is divided by at least one longitudinal or transverse partition. In order to limit the loss of

  exchanger load under certain operating conditions.

  It is known to create a bypass across the

  partition, or better to equip this partition with a flap (FR-A-

2614095).

  However, this solution is not entirely satisfactory.

  te, because the law of opening and required flow of the valve is peculiar. The present invention provides a solution to this problem. A first object of the invention is to provide a heat exchanger provided with a valve which is both simple to produce and satisfies an appropriate tripping law for the valves.

heat exchangers.

  Another object of the invention is to provide a valve which makes it possible to obtain in a simple manner a controlled flow rate at

weak opening.

  Another object of the invention is to provide a valve which is reliable and easy to assemble, without requiring complex machining operations for the elements of the heat exchanger. The heat exchanger is of the type comprising a water box divided by a partition into two chambers interconnected by

  tubes, this partition being pierced with a normal light-

closed by a flapper.

  According to a first characteristic of the invention, the light is surrounded, on one side of the partition, with an inclined bearing surface, and the valve comprises a T-shaped elastic blade whose core is homologous to this bearing surface, while the branches of the T are taken in the thickness of

  the partition on either side of this edge, so as to

  piercing the soul of the T on said support surface.

  According to another aspect of the invention, the light is housed in a prismatic surface whose shape corresponds to that of the soul of the elastic blade. This makes it possible to obtain a controlled flow with low opening. Said prismatic surface can be defined by two side walls that runs along the blade

  elastic during its deformation, and an end wall.

  In an interesting embodiment, in which the water box comprises a U-shaped cross section duct closed by a header plate, the branches of the T are folded over the wall of the partition which is opposite to the bearing surface, and this fold comes into sealing contact with the seal mounted between the partition and the header plate. The branches of the T may for example be embedded in slots formed in the thickness of the partition, and these slots may be integrally molded with the partition. We thus obtain a mode

  particularly economical and particularly

reliable.

  Other features and advantages of the invention

  will appear on examination of the detailed description below,

  and accompanying drawings, in which: - Figures 1 and 2 are two corresponding sectional views of a portion of a vehicle heat exchanger; - Figures 3 and 4 are two views similar to Figure 2, simplified;

  FIG. 5 is a schematic view in perspective

  both to better understand the shapes of the light and the bearing surface illustrated in Figures 3 and 4; FIGS. 6 and 7 are a side view and a view from above of the elastic blade of the valve according to the invention,

  while Figure 8 is a schematic view in perspective.

  tive; - Figures 9 and 10 are two corresponding sectional views

in Figure 2.

  The attached drawings are of a certain character. As a result

  they are an integral part of this description, and

  can not only serve to better understand that

  here, but also contribute to the definition of the invention, the

optionally.

  In FIGS. 1 and 2, a water box is defined by a duct 1 with U-shaped cross-section, the open face of which receives a gasket 6, then a manifold plate 7, provided with collars such as 71 and 72 to receive tubes. such as 81 and 82, also equipped with a fin structure 9. It is seen in 810 and 820 the ends of the tubes protrude inwards

of the water box.

  This is subdivided into two parts by a partition 5, which is here placed in cross section, but could be

rise longitudinally.

  The partition 5 is equipped with a light 2, closed by a

  valve 4, which normally rests on a bearing surface 3.

  In FIGS. 3 to 5, it appears that the light 2 (FIGS. 3 and 5) opens on the edge of the partition 5 which faces the collecting plate 7. This light is formed in a solid mass 55 of the partition 5, with on either side of the overthicknesses 51 and 52. The solid mass 55 is in the general shape of an inclined plane descending towards the collecting plate 7. Around the light 2, it defines a plane inclined by two lateral bearing surfaces 32 and 33 , an end bearing surface 31, and two flat surfaces 34 and 35 situated at the same level as slots 58 and 59 formed in the thickness of the partition 5, at its plate-plate-edge 7. support 31 to 35 are housed inside a prismatic surface defined by side walls 36 and 37

  as well as an end wall 38.

  The valve (FIGS. 6 to 8) has a general T-shape with a core 41, and a folded T-piece with wings 42 at the same level as the core 41, a fold 43, and a face

  lower 44 of the same width as the wings 42.

  FIGS. 9 and 10 show, in collector plate view, the elements that have just been described, respectively with and without the elastic blade 4. These FIGS. 9 and 10 also have the trace of four tubes connected to the

water box.

  Those skilled in the art will understand that the partition 5 thus obtained can be manufactured directly by molding, including

slots 58 and 59.

  The valve is placed by inserting the metal elastic blade, preferably stainless steel, referenced 4, so that its upper wings 421 and 422 engage completely in the slots 58 and 59. The blade thus taken in the thickness of the partition 5 lies

  prestressing on bearing surfaces 31, 32 and 33.

  The prismatic surface defined by the vertical walls 36 and 37, as well as the oblique vertical wall 38 (established as a function of the pivoting movement of the core 41), are therefore

  homologues of the soul's form 41.

  FIG. 1 shows that the ply 43 of the elastic blade can rest in a perfectly tight manner on the seal 6. In addition, the rounded shape of the fold avoids any break in the seal

6 in operation.

  The prestressing of the core 41 of the valve on its bearing surface makes it possible to delay the opening of the valve up to a certain differential pressure threshold. It will be observed that the pressure coming from the bottom is defined by the shape of the light 2, whereas the pressure coming from above applies

over the entire surface of the flapper.

  In addition, immediately after opening the valve, and for a chosen range of pressure differences between the two chambers of the water box, the leakage rate authorized by the valve remains reduced, as long as its arrow is less than a threshold value. , which corresponds to the moment when the end

  free of the soul 41 will exceed the top of the surface 38.

  After that, the flapper is wide open, and the flow of

leakage becomes important.

  These features are optimal for the needs that exist in the application to a heat exchanger at

  several passes for a motor vehicle.

  The device according to the invention is particularly simple and economical to build, as well as of small size, compared to other solutions using for example a

  coil spring for check valve.

Claims (6)

claims   1. Heat exchanger, of the type comprising a water box   (1,7) divided by a partition (5) into two intercon-   connected by tubes (81, 82), this partition being pierced by a light (2) normally closed by a valve (4), characterized in that the light (2) is surrounded on one side of the partition ( 5), an inclined bearing surface (31-35), in that the valve comprises a T-shaped elastic blade (4) whose core (41) is homologous to this bearing surface, and in that the branches (421, 422) of the T are taken in the thickness of the partition (5) so as to prestress   the soul of the T on said support surface.   2. Device according to claim 1, characterized in that the light (2) is housed in a prismatic surface (36,38) whose shape corresponds to that of the core (41) of the elastic blade, which allows to obtain a controlled flow at weak opening.   3. Device according to claim 2, characterized in that the prismatic surface is defined by two side walls (36,37) that runs along the elastic blade during deformation.   4. Device according to one of claims 1 to 3, in   which the water box comprises a duct (1) with section   right U-shaped, closed by a collector plate (7), characterized   in that the legs of the T are folded (43) on the wall of the partition which is opposed to the bearing surface, the fold (43) coming into sealing contact with the seal (6)   between the partition (5) and the collector plate (7).   5. Device according to one of the preceding claims,   characterized in that the lumen (2) extends to an edge of the partition (5), and in that the legs of the T are embedded in slots (58, 59) formed in the thickness of the partition.   6. Device according to claim 5, characterized in that the slots (58,59) are integrally molded with the partition.