EP3234473A1

EP3234473A1 - Lateral aerator and ventilation duct provided with at least one such aerator

Info

Publication number: EP3234473A1
Application number: EP15830812.2A
Authority: EP
Inventors: Michel Brun
Original assignee: Nexter Systems SA
Current assignee: Nexter Systems SA
Priority date: 2014-12-19
Filing date: 2015-12-17
Publication date: 2017-10-25
Anticipated expiration: 2035-12-17
Also published as: IL252872A0; EP3234473B1; WO2016097639A1; FR3030698A1; FR3030698B1; IL252872B

Abstract

The invention concerns a lateral aerator (2) for a ventilation duct (1), comprising blowing openings (5, 5') each formed by a slot (3, 3') and a fin (4, 4') having a guiding face (4a, 4'a). According to the invention: a central axis (DTH) of each guiding face (4a, 4'a) is inclined in an upstream direction, the central axis (DTH) of the guiding face (4a, 4'a) of each of the first and last fins (4, 4') is inclined at an angle of between 10° and 35° and between 60° and 85°, the angle of inclination of the central axes (DTH) of the guiding faces (4a, 4'a) of the second fin to the penultimate fin (4; 14) increases gradually, and the width of the guiding face (4a, 4'a) of each of the second to the last fins (4'; 14') is greater than or equal to that of the fin (4; 14) immediately upstream.

Description

LATERAL BLOWING MOUTH AND AERAULIC SHEATH PROVIDED WITH AT LEAST ONE SUCH BLOWING MOUTH

The present invention relates to the field of air conditioning or air conditioning ducts aaulic and door, in particular, a side blower mouth for a ventilation duct and an air duct provided with at least one such mouth blower .

An air duct is a duct intended to supply air to a given space. The space may be, for example, a part of a building, a vehicle interior, etc.

In order to distribute the air supply throughout the space to be air-conditioned, blowing outlets in fluid communication with the interior of a main duct or its secondary branches are arranged on the walls of these ducts at the borders. of said space. It is generally desired that the jet of air exiting a blower mouth implanted on the main or secondary sheath does so in a direction as perpendicular as possible with the wall on which it is implanted, therefore perpendicular to the flow passing through the sheath. .

For reasons of cost and convenience of installation, it is known to provide air ducts that cross the space to be air-conditioned, or are contiguous to its walls, whether or not these conceal them, and which include mouths of blowing, said lateral, arranged directly on a longitudinal wall of the ventilation duct. In such a case, it is often necessary to have several lateral outlet mouths one after the other, so as to blow a sufficient amount of air out of the air duct, regardless of the amount of air that a air blower mouth can sample. It may be desirable to withdraw each time up to more than 25% of the air flowing in the sheath.

More generally, it is necessary for a good mixing of the space, that the air jets at the outlet of the lateral discharge mouths have, relative to the direction of the flow of air in the ventilation duct, an angle deflection which is large enough to allow effective air conditioning of the space to be air-conditioned. A deflection angle of 30 ° really appears as the minimum allowable value. Ideally, one would even like to obtain a deflection angle of 90 °.

Thus arises the problem of taking a sufficient quantity of air through the blowing outlets, while ensuring directivity of the air jets at the outlet and without being too intrusive vis-à-vis the main flow in sheath, so to be able to make several successive samples in the same sheath.

The French patent application FR 2358620 A1 discloses a lateral blowing mouth for obtaining air jets substantially perpendicular to the ventilation duct at the outlet. This blowing mouth is mounted in a longitudinal wall of the ventilation duct and comprises a plurality of blowing openings each formed by a slot and a respective fixed fin. The fins consist of thin waves corrugated to present, inner side of the sheath aeraulic, a concavity turned towards the air flow and, on the outside, an opposite concavity such that two successive fins form a passage perpendicular to said longitudinal wall.

Although such an air-blowing mouth allows air jets having a deflection angle of 90 ° to be output, it can only take a small amount of the main air flow.

Moreover, because of the angular shapes inside the sheath, strong disturbances are generated in the air flow, which will significantly reduce the capacity of an identical blower mouth, but located further downstream, to take air.

To take account of these strong disturbances, it is common to make successive shrinkage of the section of the air duct, after each blow mouth, to induce an axial obstacle making the side air blowing more effective. This series of shrinkage, together with the intrusive nature of these blowholes, makes the overall jacket more resistant to airflow, resulting in less flow or involves the implementation of more powerful fans.

The present invention aims to solve the problems encountered with the known blowholes described above, and thus to provide a lateral blower outlet for taking a large amount of air flow from a ventilation duct and from it. communicating a sufficient directivity, without however greatly disturbing the flow in the duct downstream of the blowing mouth, so that several blowing mouths can be arranged closely along the duct without the obligation to use section reduction downstream of each blow-out.

Thus, the subject of the invention is a lateral blow-off mouth located or intended to be located in a longitudinal wall of an air-duct sheath along which, in use, air flows, the blow-out mouth comprising at least three blowing apertures aligned with respect to an axis of the sheath, in the mean direction of flow of air in the ventilation duct and each formed by a slot and a fixed fin, the slots forming part of a flat surface or cylindrical which is parallel or intended to be parallel to said longitudinal wall, each fin extending from the downstream edge, with respect to said mean flow direction, of the respective slot, to project into the interior of the the air duct, the fins each having a so-called guide face which is rotated or intended to be turned in a direction opposite to said mean direction of flow so that each fin is able to deflect a portion of the air flowing in the air duct and to guide it to the respective slot, through which the air exits the air duct, the blower mouth being characterized by the fact than :

a central axis of the guide face of each fin, defined as a segment connecting the midpoints of its attached and free edges, is inclined, with respect to the axis of the sheath, towards the upstream side edge of the respective slot,

the central axis of the guiding face of each of the first and last fins, that is to say the fins respectively of first rank and last row with respect to the axis of the sheath, is inclined at an angle inclination respectively between 10 ° and 35 ° and between 60 ° and 85 °,

the angle of inclination of the central axes of the guide faces of the second fin to the penultimate fin, that is to say the fins of the second rank to the penultimate rank with respect to said mean direction flow, increases gradually, and the width of the guide face of each of the second fin to the last fin is equal to or greater than that of the fin immediately upstream.

The expression "mean direction of air flow" or "flow axis" is understood to mean the mean direction followed by the non-sampled part of the air flowing in the ventilation duct, which direction will correspond to the longitudinal direction of the ventilation duct.

Preferably the contour of the guide face of each of the vanes is geometrically identical to the contour of the respective slot.

In the case of an aerodynamic duct of rectangular cross-section in the region where the lateral discharge mouth is located, with H _sheath and L _sheath respectively the height and width of the air-flow sheath measured internally, the air blower mouth may be such that, for the first fin at the penultimate fin, each slot is rectangular and has a width L _fe nte equal to L _sheath / 3 and a height H _fe nte equal to H _sheath / 2, and spacing E between two successive slots is equal to L _sheath / 6. The spacing between two slots here being the distance from the downstream edge of one fin to the upstream edge of the next.

In the case of an air duct of circular cross-section in the region where the lateral air outlet, with D _duct the diameter of the air-flow sheath measured internally, the air-blowing mouth may be such that, for the first fin-to-last fin, each slot has a profile which is rectangular in projection in a diametral plane and has a width L _fe nte equal to D _sheath / 3 and a projection height in this plane H _fe nte equal to D _sheath / 2, and the spacing E between two successive slots is equal to D _sheath / 6. The spacing between two slots here being the distance from the downstream edge of one fin to the upstream edge of the next.

For aeraulic duct rectangular or circular cross section, the air blowing opening may be such that for the last fin, the respective slot has a width L _'f equal _ga te L ^ _ne / 2, or where appropriate at D _sheath / 2, and a height H 'slot equal to H _sheath / 2, or where appropriate to D _sheath / 2, and the spacing P' between the downstream edges of the last two slots is equal to 2L _sheath / 3 or if necessary 2D _sheath / 3.

The above dimensional relationships lead to a blowing mouth having a satisfactory air sampling rate while limiting very little the non-sampled part of the air, which makes it possible to provide several blowing mouths one after the other. others while maintaining the same efficiency of the mouths of blowing.

According to a first particular embodiment of the present invention, the guide faces of the first fin to the penultimate fin are flat and their angle of inclination is a linear function of the rank of the fin, with a permissible deviation +/- 15% between the theoretical line and the actual value of the angle of inclination, preferably a deviation of -10%, for each from the first fin to the antepenultimate fin, and preferably a deviation of + 10%, for the penultimate fin.

If we call N the total number of fins, said linear function advantageously has a steering coefficient equal to 90 ° / N.

For example, the lateral blow mouth may comprise five fins and the guide faces of the first, second, third and fourth fins may advantageously have an inclination angle of 19 °, 33 °, 50 ° and 74 °, respectively. While the theoretical approach described above would give for them, with a steering coefficient of 90/5 = 18 °, respective inclinations of 18 °, 36 °, 54 ° and 72 °. The guide face of the last fin may be flat and preferably have an angle of inclination of 85 ° at its base.

Advantageously, the last fin (wider than the others) may be provided, at the free end of the fin, a terminal spoiler having a deflection surface in the extension of the guide face of the fin, the deflection surface being inclined, with respect to the surface containing the slots, an angle between 10 ° and 40 °, preferably equal to 25 °.

According to a second embodiment of the present invention, each fin will have its central axis passing through the middle of the free edge of the fin and the middle of the edge of the base of the fin contiguous to the slot associated with said fin, each central axis being inclined, with respect to the axis of the sheath, towards the upstream side edge of the respective slot,

the central axis of each of the first and last fins, that is to say fin respectively of first rank and last row with respect to the axis of the sheath is inclined at an angle of inclination respectively between 10 ° and 35 ° and between 60 ° and 85 °, the inclination angle of the central axes of the second fin to the penultimate fin, c ' that is to say the fins of the second row in the penultimate rank with respect to said mean direction of flow, increases gradually,

the width of each guide face of each of the second fin to the last fin is equal to or greater than that of the fin immediately upstream, and

the guide faces of each fin are concave downstream of their central axis.

According to an alternative embodiment, each concave guide face of the first fin to the last fin may be subdivided into at least two successive planes.

According to another preferred variant, each guide face consists of a concave surface with a continuous radius of curvature.

Advantageously, the central points of the free edges of the different fins will all be located on a line that is inclined relative to the axis of the sheath.

Advantageously, the fins may have a thickness that increases continuously from the free edge of the fin to the base of the latter.

According to a third embodiment of the invention, the lateral blowing mouth also comprises, for each fin, a so-called outer fin which extends, outside the cladding, on the other side of the surface containing the fins. slots and which has, in the extension of the guide face of the fin corresponding, a guide face which is perpendicular to the surface containing the slots.

The outer fins may have a thickness that increases continuously from the free edge of the outer fin to the base of the latter.

It is however possible to provide external fins of constant thickness, especially in the case of fins themselves of constant thickness.

The present invention also relates to a ventilation duct provided with at least one side blower as defined above.

To better illustrate the object of the present invention, will be described below, by way of indication and not limited to several particular embodiments with reference to the accompanying drawing.

On this drawing :

- Figures 1 and 2 are views respectively in longitudinal section and in perspective, of a ventilation duct provided with a side blowing mouth according to a first embodiment of the present invention;

- Figure 3 is a view similar to Figure 1, a variant of the first embodiment;

FIG. 4 is a simulation view of an air flow through an air duct provided with the lateral blow-out mouth of FIG. 3, the zones of different speeds having been represented;

- Figure 5 is a view similar to Figure 1, a second embodiment of the present invention; Figure 6 is a view similar to Figure 1, of a third embodiment of the present invention;

FIG. 7 is a simulation view of an air flow through an air duct provided with two lateral blow outlets of FIG. 6, the zones of different speeds having been represented; and

- Figure 8 is a longitudinal sectional view of a ventilation duct provided with two side blow vents according to an alternative embodiment of this third embodiment of the invention.

Referring to Figures 1 and 2, it can be seen that there is shown a ventilation duct, designated duct 1 thereafter, provided with a side blower 2 according to a first embodiment.

The sheath 1 is a conventional sheath made of thin sheets of rectangular cross section.

The blowing mouth 2 is formed in a flat longitudinal wall 1a of the sheath 1 and consists of several pairs of slots 3 / fins 4, each pair forming a blowing opening 5 through which air can exit the sheath 1.

The fins 4 are rectangular or square and obtained by cutting the sheet forming the wall 1a, then folding towards the inside of the sheath 1 around a fold line orthogonal to the longitudinal direction of the sheath 1, thus leading to the formation of the slots 3 geometrically identical to the fins 4, the latter being flat. The fold line corresponds to the edge 3a of the slot 3 which is located downstream, and each fin 4 is inclined towards the edge 3b, opposite the edge 3a, of the respective slot 3.

Each fin 4 has, on the slot side 3, a guide face 4a which is here flat and inclined with respect to the plane of the longitudinal wall of which the slots 3 are part, thus also with respect to the axis Δ of the sheath 1. For a rectangular section duct, the axis Δ passes through the center of gravity of the section of the duct.

FIGS. 1 and 2 and for each fin 4 show a central axis D _TH of the guiding face 4a, 4 'a which is defined as a segment connecting the midpoints of the attached and free edges of the fin considered ( see also Figure 2). Each segment materializes the general direction of the wing considered.

If this distinction is of limited interest for flat fins since the direction D _TH is then coincident with that of the guide face 4a, it is useful for fins having a different shape as will be seen later for the mode embodiment of Figures 5 and 6.

In the illustrated example, the blowing mouth 2 comprises five blowing openings 5: five slots 3 with which are associated five fins 4. Obviously, the number of blowing openings 5 can be modified according to various parameters such as: that the dimensions of the air duct and the space to be air-conditioned, the speed of air flow in the duct, etc.

The blow openings 5 are aligned in the longitudinal direction of the sheath 1 and the first blow opening 5, or first row opening, and thus the first fin 4 and the first slot 3, are defined as the opening blowing 5 most upstream. The second blowing opening 5, or of second rank, is that immediately following the first blowing opening 5, and so on. For the sake of clarity, the last blow opening, the last fin and the last slot will subsequently be designated by the reference numerals 5 ', 4' and 3 '.

The average direction of airflow is shown in Figure 1 by an arrow. In general, in the figures, the air flows from the right to the left and the first fin 4 is the furthest right while the last fin 4 'is the leftmost.

According to the first embodiment of the present invention, the dimensions of the first to fourth blow openings 5 have the following characteristics:

taking the _{sheath 1} and L _sheath respectively the height and the width of the sheath 1 measured internally, the slots 3 each have a width L _fe nte equal to L _sheath / 3 and a height H _fe nte equal to H _sheath / 2, and the spacing E between two successive slots 3 is equal to L _sheath / 6; the pitch P = Lfente + E which separates the downstream edges of two successive slots is therefore equal to L _sheath / 2; it is recalled here that the width and the height of each slot 3 are equal to that of the associated fin 4, and

the angle of inclination of the guide faces 4a (and that of the central axes D _TH ) increases gradually from the first fin 4 to the penultimate 4 by following a linear function of the rank of the fin 4 of equal steering coefficient at 90 ° / N (N being the number of fins). Here for 5 fins the steering coefficient is equal to 18 °. However, we can accept, in relation to the theoretical line, a possible digging in the central zone of the mouth of blowing 2, with a negative gap of not more than 10%. It will also be possible to admit a positive difference of 10% for the penultimate fin 4. The guide faces 4a (and central axes D _TH ) of the first to fourth fins 4 have for example here an inclination angle of 19 ° respectively. , 33 °, 50 ° and 74 °, to compare with the values of the theoretical line of 18 °, 36 °, 54 ° and 72 °.

The fifth blow opening 5 'has the following characteristics:

the slot 3 'has a width L _fe nte equal to L _sheath / 2 and a height H' _fe nte equal to H _sheath / 2, and the spacing P 'between the downstream edges of the slot 3' and the slot 3 of the penultimate blow opening 5 is equal to 2L _sheath / 3 (P '= the slot + E); in other words, the width L ' _fe nte the slot 3', and therefore the fin 4 ', is 1.5 times greater than the width L _fe nte other slots 3, and therefore the fins 4 , and

the angle of inclination of the guide face 4 'a is 85 °.

Referring now to Figure 3, it can be seen that there is shown a variant of the blower 2, which differs from the first embodiment only in that the last fin 4 'is provided a terminal spoiler 4'b. We will therefore use the same reference numbers.

The spoiler 4'b has been obtained by folding the sheet metal part forming the fin 4 'in the vicinity of the free edge of the latter, around a fold line parallel to the edge 3' a and orthogonal to the mean direction of flow (ie to the axis Δ of the sheath). The spoiler 4'b is here inclined at 25 ° with respect to the longitudinal wall 1a of the sheath 1. Referring now to FIG. 4, it can be seen that there is shown a simulation of the air flow in the sheath 1 of FIG. 3, by its isovessness lines in four domains: high speeds in the A domain, average speeds in the B domain, characteristic plume blowing rates in the C domains, intermediate speeds in the D domains and reduced speeds in the E domains.

It can be seen that the blowing mouth 2 according to the variant of the first embodiment makes it possible to obtain at the outlet a plume having a deflection angle of approximately 35 ° with respect to the mean direction of flow of air in the sheath. 1. The simulation also shows that the blower 2 takes 23% of the amount of air arriving at the blower 2 in the duct 1.

The blower 2 thus allows both to take a significant amount of air and to communicate air jets a satisfactory deflection angle.

Furthermore, it is emphasized here that the fins 4, 4 'disturb little the flow of the air not taken and that the air recollement distance to the longitudinal wall after the last fin 4' is acceptable, especially account given that the simulation was conducted leaving the downstream of the sheath 1 gaping, this being the most unfavorable condition for the operation of a side blower. By associating several fins whose degree of intrusion inside the sheath is progressively increasing from upstream to downstream, the invention thus makes it possible to obtain a relatively large air withdrawal without disturbing the airflow. . Indeed the differences of intrusion of a fin to the next allow the downstream fin to make a sample of air without being too disturbed by the upstream fin. When the fins all have the same degree of intrusion into the sheath, the efficiency of the fins that follow the first is reduced, the air flow generally bypassing the fins downstream.

Similar results are obtained for the blowing mouth 2 according to the first embodiment.

Referring now to FIG. 5, it can be seen that the longitudinal wall 11a of a ventilation duct 11 provided with a lateral blower 12 according to a second embodiment is shown in longitudinal section. of the present invention, which is composed of five blow openings 15 each formed by a slot 13 and a fin 14.

The blowing mouth 12 is in the form of a module comprising a frame which is mounted in a corresponding cutout made in the longitudinal wall 11a and which is fixed thereto by any appropriate means (clipping, riveting, bolting, etc.), and across which extend the fins 14 spaced apart from each other so as to define in the same alignment the slots 13.

The fins 14 are distinguished from the fins 4 in that the guide faces 14a are concave, with the concavity oriented opposite to the mean direction of flow of the air, and the fins 14 are formed by profiles having a thickness. which gradually increases from their free edge to their base.

FIG. 5 shows by dashed lines D _TH the central axes of each fin 14, 14 '. As can be seen in the figure, each central axis D _TH is a line that passes through the middle of the free edge 14b, 14'b of the fin and the middle of the edge of the base 14c, 14 'c of the fin which is contiguous to the slot 13, 13' associated with said fin.

As in the previous embodiments, each central axis D _TH is inclined, with respect to the axis Δ of the sheath 1, to the edge upstream side 13b, 13 'b of the slot in question.

The central axis D _TH of each of the first and last fins 14, 14 ', that is to say the fins of first rank 14 and last row 14' respectively with respect to the axis Δ of the sheath and in the direction of flow, is inclined with an angle of inclination respectively between 10 ° and 35 ° (for the fins of first rank) and between 60 ° and 85 ° (for the last fin).

Moreover, the angle of inclination of the central axes D _TH of the second fin to the penultimate fin 14, that is to say the fins 14 of the second row to the penultimate rank with respect to said mean direction of flow, gradually increases.

Finally the width of each guide face 14a, 14 'a of each of the second fin 14 to the last fin 14' is equal to or greater than that of the fin 14 immediately upstream.

All these characteristics correspond to those described for the embodiments of Figures 1 to 3, considering that the central axes D _TH of each fin are equivalent to planes 4, 4 'of the flat fins.

It will be noted in particular that the central points of the free edges 14b, 14'b of the different vanes are all located on a straight line π which is inclined with respect to the axis Δ of the sheath. This embodiment differs from the previous ones in that the guide faces 14a of each fin are no longer merged with the central axes D _TH but are concave downstream of their central axis D _TH .

In particular, and considering FIG. 5, which shows a blow mouth cut off by a median plane, it is possible to define in this median plane and for each guide face 14a a tangent to the vertex 14b of the guide face, and a tangent to the base 14c in the vicinity of the slot 13.

These theoretical tangents do not exclude a possible connection fillet encompassing the free edge of the fin.

As before, the reference numerals 13 ', 14' and 15 'are used when reference is made to the last blowing opening.

In the example shown, the third fin 14 constitutes the so-called central fin.

According to the second embodiment, the blowing openings 15, 15 'still have the following characteristics:

the slots 13 of the first to fourth blow openings 15 are of the same dimensions,

the slots 13 and 13 'satisfy the same relations with respect to the sheath 11 as those indicated for the first embodiment,

the tangent to the base 14c of the first fin 14 is inclined at an angle of 65 °,

the tangents to the bases 14c of the second to fourth fins 14 are inclined at an angle of 75 °,

the tangent to the base 14 'c of the last fin 14' is inclined at an angle of 85 °, the angle of inclination of the tangents at the vertices 14b of the guide faces 14a increases progressively from the first fin 4 to the central fin 4 by following a linearly increasing function of the rank of the fin 4 with a steering coefficient of 90 ° / N, if N is the number of fins, and therefore at 18 ° here (N = 5), and ordinate at origin equal to -90 ° / N in general and thus -18 ° for N = 5 the angles of inclination then being respectively 0 °, 18 ° and 36 °, and

the angles of inclination of the tangents to the vertices 14b and 14'b of the fourth and fifth fins 14 and 14 'are respectively 65 ° and 27 °.

The more closed value of this tangent angle for the last fin 14 'plays a role similar to that of the spoiler 4'b of the second embodiment. Such a spoiler is here incorporated into the overall curvature of the guide face 14 'a.

Furthermore, the fins 14 and 14 'have a thickness which increases continuously from the free edge of the fin 14 and 14' to their base where, with the exception of the last fin 14 ', the thickness is such that the fin 14 joins the edge of the upstream side of the slot 13 of the blow opening 15, 15 'immediately following. For the last fin 14 ', the thickness follows a similar growth of the fin thickness to about 2/3 of the width of the fin 14', then a higher growth in order to join gradually the longitudinal wall 11a.

With such a configuration of the lateral discharge mouth 12, a sampling rate of 25% and a deflection angle of about 39% are obtained, under the same simulation conditions as in FIG. 4, with a slight perturbation of the part. not removed from the air. According to this embodiment, each guide face therefore consists of a concave surface with a continuous radius of curvature of the base 14c, 14 'c of the fin at the top 14b, 14'b of said fin.

According to an alternative embodiment, each concave guide face 14a of the first fin 14 to the last fin 14 'may be subdivided into at least two successive planes which will intersect at a middle portion of each fin (for example half height of each fin).

Referring now to Figure 6, it can be seen that there is shown in longitudinal sectional view a blowing mouth 12, which differs from that of the second embodiment only in that one provides, in correspondence of each of the fins 14, 14 ', outer fins 16 which provide a deflection angle of 90 °. We will therefore use the same reference numbers.

The outer fins 16 are all formed by a prismatic element whose bases are right triangles, with a lateral guiding face 16a perpendicular to the longitudinal wall 11a and extending in the extension of the guiding face 14a, 14 'a of the respective fin 14, 14 ', an inclined side face 16b turned away from the sheath 1 and a side face against the underside of the fin 14, 14'. The outer fins 16 are dimensioned such that for the first to fourth fins 14, the thickness of the outer fin 16 at the longitudinal wall 11a is substantially equal to that of the base of the respective fin 14.

The outer fins 16 are here separate fins 14, 14 'and are integral with those ci by any appropriate means (welding, gluing, screwing, riveting ...). The connecting means may be specific to each outer fin 16 or, more advantageously, it may be possible to make a plate which will carry all the outer fins 16 and which will allow to fix them to the sheath 1.

It will also be possible to produce in the form of a single piece fastened to the sheath the internal fins 14, 14 'and the outer fins 16.

In the example shown, the outer fins 16 comprise a softer core, having areas of lower density (represented by the small circles), surrounded by a layer of protective material harder and stiffening.

Alternatively, the fins 14, 14 'and the outer fins 16 may be integrally formed.

In this third embodiment, as in the second, it will be advantageous to ensure, especially for security reasons, that the different fins 14, 14 ', 16 have no sharp edges, but slightly rounded edges.

Referring now to Figure 7, it can be seen that there is shown a simulation of the air flow in the sheath 11 of Figure 6, by its lines of isovitesse, with the same domains A, B, C, D and E, and by velocity vector fields.

It can be seen that the blowing mouth 12 according to the third embodiment makes it possible to obtain at the outlet a plume having a deflection angle of approximately 90 °. The simulation also shows that the sampling rate is around 25%.

The presence of the outer fins 16 and can strongly deflect the air jets output. A deflection angle of up to 100 ° (thus slightly backward of the main flow) by slightly inclining the guide face 16a towards the slot 13.

Moreover, as for the second embodiment, the fins 14, 14 'do not disturb the flow of the air that has not been sampled, with a rapid gluing of the air against the longitudinal wall 11a of the air-flow duct 11, which which makes it possible to place several lateral blow-out vents 12 one after the other while maintaining the same efficiency (sampling rate, directivity of the air jets).

It is possible to provide between two successive lateral blow-out vents 12 a distance of at least 1.5 times the length of the blow-out mouth 12 when the blow-out mouths 12 are arranged in the same longitudinal wall 11a. This distance can be reduced to 1 times the length when the two successive blow outlets 12 are on different walls of the sheath. This spacing is also suitable for the first and second embodiments.

It is understood that the particular embodiments which have just been described have been given for information only and not limiting and that modifications can be made without departing from the scope of the present invention.

For example, the blowing mouth 2 according to the first embodiment could also be in the form of a module distinct from the sheath, which is formed in a similar manner to the blower mouth 12 by a frame through which extends the fins 4, 4 ', and which is fixed to the sheath by any suitable means.

Figure 8 describes an alternative embodiment of this third mode. This variant is also close the mode according to Figure 3 which it differs only by the addition of external fins 6 which are made in the form of thin sheets (all of the same length) which join the fins 4, 4 'at their base and which are perpendicular to the wall la of the sheath.

This variant makes it possible, as described with reference to FIG. 6, to strongly deflect the air jets at the outlet. Here again a deflection angle of about 90 ° can be obtained with a sampling rate of about 25%.

It is possible to obtain a deflection angle of up to 100 ° (thus slightly downward from the main stream) by slightly inclining the guide face 6a towards the slot 3.

Other variants are possible without departing from the scope of the invention.

The invention has been described with reference to rectangular section ducts. It is also possible to implement it with cylindrical sheaths. In this case the slots 3, 3 ', 13 or 13' are no longer located in a plane but are part of a cylindrical surface which may be the wall of the sheath or a wall attached to the sheath.

The calculation modes of the slots explained above apply by replacing the expressions of the height H _sheath and the width L _sheath of the sheath by the diameter D _sheath of the sheath. The slots 3, 13 are carried by a cylindrical surface and are no longer rectangular but have a profile which is rectangular in projection in a diametral plane of the sheath.

The width L _fe nte will then preferably be equal to D _sheath / 3 and the height of the slit in projection in this diametral plane H _fe nte will be equal to D _sheath / 2. The spacing E between two successive slots 3, 13 will preferably be equal to Dg _a i _n e / 6.

As a variant, it is also possible to provide blow vents similar to those shown in FIGS. 1, 3, 5, 6 or 8 but in which the first fin (upstream) and / or the last fin (downstream) and that their associated slots are omitted. Such a solution will have degraded sampling performance compared to the preferred modes described above, but it may be sufficient in certain applications. These embodiments will always include according to the invention a progressivity of the opening of the fins therefore their intrusion into the sheath, and possibly their width.

It is also possible to define fins according to the invention but for which the height of the fins is less than H _sheath / 2, such a solution will reduce the amount of air taken from the sheath.

Conversely, it is also possible to define fins according to the invention but for which the height of the fins is greater than H _sheath / 2, in this case the recovery of the flow in the sheath will be disturbed downstream of the fin considered which will harm the sampling carried out by the following wing.

In a similar way, it is also possible to define fins according to the invention but for which the width of the fins is less than L _sheath / 3, such a solution will also decrease the amount of air taken from the sheath.

Finally it is also possible to define fins according to the invention but for which the width of the fins is greater than L _sheath / 3, in this case the fin will be more intrusive in the main stream which will cause losses that will penalize the downstream flow at the expense of the fins and slots therein.

Claims

1 - Side discharge mouth (2; 12) located or intended to be located in a longitudinal wall

(la; 11a) of a ventilation duct (1; 11) along which, in use, air flows, the blower (2; 12) comprising at least three blowing apertures (5, 5 '; 15, 15') aligned with respect to an axis

(Δ) of the sheath, in the mean direction of flow of air in the air duct (1; 11) and each formed by a slot (3, 3 '; 13, 13') and a fixed fin ( 4, 4 ', 14, 14'), the slots (3, 3 '; 13, 13') forming part of a planar or cylindrical surface which is parallel or intended to be parallel to said longitudinal wall

(la; 11a), each fin (4, 4 ', 14, 14') extending from the downstream side edge (3a, 3 'a), with respect to said mean flow direction, of the respective slot (3, 3 '; 13, 13'), to protrude inside the air duct (1; 11), the fins (4, 4 '; 14, 14') each having a so-called guiding face ( 4a, 4a, 14a, 14a) which is rotated or intended to be rotated in a direction opposite to said mean direction of flow so that each fin (4, 4 ', 14, 14') is fit diverting a portion of the air flowing into the air duct (1; 11) and guiding it to the respective slot (3, 3 '; 13, 13'), through which the air exits the air duct (1; 11), the blower opening (2; 12) being characterized by the fact that:

a central axis (D _TH ) of the guide face (4a, 4 'a; 14a, 14'a) of each fin (4, 4'; 14, 14 '), defined as a segment connecting the midpoints of its bound and free edges, is inclined, with respect to the axis (Δ) from the sheath towards the upstream side edge (3b, 3'b) of the respective slot (3, 3 '; 13, 13'),

the central axis (D _TH ) of the guide face (4a, 4 'a; 14a, 14' a) of each of the first and last fins (4, 4 '; 14, 14'), ie said fin respectively first-rank (4; 14) and last-rank (4 ';14') relative to the axis (Δ) of the sheath, is inclined at an angle of inclination respectively of 10 ° and 35 ° and between 60 ° and 85 °,

the angle of inclination of the central axes (D _TH ) of the guide faces (4a, 4 'a) of the second fin to the last-to-last fin (4; 14), that is to say the fins (4; 14) of the second rank in the penultimate rank with respect to said mean direction of flow, gradually increases, and

the width of the guide face (4a, 4 'a; 14a, 14' a) of each of the second fin (4; 14) to the last fin (4 '; 14') is equal to or greater than that of the vane (4; 14) immediately upstream.

2 - Lateral outlet mouth (2; 12) according to claim 1, characterized in that the contour of the guide face (4a, 4 'a; 14a, 14' a) of each of the fins (4, 4 ') 14, 14 ') is geometrically identical to the contour of the respective slot (3, 3'; 13, 13 ').

3 - Side blowing mouth (2; 12) according to one of claims 1 and 2, the air duct (1;

11) being of rectangular cross-section in the region where the lateral blow-off mouth (2;

12), with H _sheath and L _sheath respectively the height and width of the duct aeraulic (1; 11) measured internally, characterized in that, for the first fin to the penultimate fin (4; 14), each slot (3; 13) is rectangular and has a width Lfente equal to L _sheath / 3 and a height H _fe nte equal to H _sheath / 2, and the spacing E between two successive slots (3; 13) is equal to L _sheath / 6.

4 - Side blowing mouth (2; 12) according to one of claims 1 and 2, the air duct being of circular cross section in the region where the lateral blow mouth (2; 12) is located, with D _sheath the diameter of the air-flow sheath measured internally, characterized in that, for the first fin (4; 14) at the penultimate fin (4; 14), each slot (3; 13) has a profile which is rectangular in projection in a diametral plane and has a width L _fe nte equal to D _sheath / 3 and a projection height in this plane H _fe nte equal to D _sheath / 2, and the spacing E between two successive slots (3; 13) is equal to D _sheath / 6.

5 - Lateral outlet mouth (2; 12) according to one of claims 3 or 4, characterized in that, for the last fin (4 ';14'), the respective slot (3 ';13') has a width L _fe nte equal to L _sheath / 2, or where appropriate to D _sheath / 2, and a height H ' _fe nte equal to H _sheath / 2, or where appropriate to D _sheath / 2, and the spacing P 'between the downstream edges (3a, 3' a) of the two last slots is equal to 2L _ga i _n e / 3 or, where appropriate 2Dgaine / 3.

6 - Side blower (2) according to one of claims 1 to 5, characterized in that the guide faces (4a) of the first fin (4) to the penultimate fin (4) are flat and that their angle of inclination is a linear function of the row of the fin (4), with a permissible deviation of +/- 15% between the theoretical straight line and the actual value of the angle of inclination, preferably a deviation of -10%, for each of the first fin (4) to the antepenultimate fin (4), and preferably a deviation of + 10%, for the penultimate fin (4).

7 - Side blow-off mouth (2) according to claim 6, characterized in that the guide face (4 'a) of the last fin (4') is flat and, preferably, has an angle of inclination of 85 °.

8 - Side blowing mouth (2) according to claim 7, characterized in that the last fin (4 ') is provided at the free end of the fin (4') with a terminal spoiler (4). b) having a deflection surface in the extension of the guide face (4 'a) of the fin (4'), the deflection surface being inclined with respect to the surface containing the slots (3, 3 ') ) at an angle of between 10 ° and 40 °, preferably 25 °.

9 - Side blowing mouth (12) according to one of claims 1 to 5, characterized in that each fin has its central axis (D _TH ) which passes through the middle of the free edge of the fin and the middle of the edge of the fin base contiguous with the slot (3, 3 '; 13, 13') associated with said fin (4, 4 '; 14, 14'), each central axis (D _TH ) being inclined, by relative to the axis (Δ) of the sheath, towards the upstream side edge (3b, 3'b; 13b, 13'b) of the respective slot (3, 3 '; 13, 13'),

the central axis (D _TH ) of each of the first and last fins (4, 4 ', 14, 14'), i.e. first-row (4; 14) and last-rank ( 4 ', 14') with respect to the axis (Δ) of the sheath, is inclined at an angle of inclination respectively between 10 ° and 35 ° and between 60 ° and 85 °,

the angle of inclination of the central axes (D _TH ) of the second fin to the penultimate fin (4; 14), that is to say the fins (4; 14) of the second row to the penultimate rank with respect to said mean direction of flow, increases progressively,

the width of each guide face of each of the second fin (4; 14) to the last fin (4 '; 14') is equal to or greater than that of the fin (4; 14) immediately upstream, and

the guide faces of each fin are concave downstream of their central axis (D _TH ).

10 - Lateral blow mouth according to claim 9, characterized in that each concave guide face (14a, 14 'a) of the first fin (14) to the last fin (14') is subdivided into at least two planes successive.

11 - Side blowing mouth (12) according to claim 9, characterized in that each guide face (14a, 14 'a) consists of a concave surface with a continuous radius of curvature.

12 - Side blowing mouth (12) according to one of claims 9 to 11, characterized in that the central points of the free edges of the different fins are all located on a straight line (π) which is inclined relative to the axis (Δ) of the sheath.

13 - Lateral outlet mouth (12) according to one of claims 9 to 12, characterized in that the fins (14, 14 ') have a thickness which increases continuously of the free edge of the fin (14, 14 ') to the base of the latter.

14 - Side blower (12) according to one of claims 1 to 13, characterized in that it also comprises, for each fin (4, 4 '; 14, 14'), a so-called outer fin (6 16) which extends outside the sheath (1; 11) on the other side of the surface containing the slots (3, 3 ', 13, 13') and which in the extension of the guide face (4a, 4'a, 14a, 14'a) of the corresponding blade (4, 4 ', 14, 14'), a guide face (6a, 16a) which is perpendicular to the surface containing the slots (3, 3 ', 13, 13').

15 - Side blow-off mouth (12) according to claim 14, taken in accordance with claim 13, characterized in that the outer fins (6; 16) have a thickness which increases continuously from the free edge of the fin outside (6; 16) to the base of the latter.

16 - Aeraulic duct (1; 11) provided with at least one lateral outlet mouth (2; 12) as defined in one of claims 1 to 15.