EP4168718A1

EP4168718A1 - Removable secondary air flow orientation device intended to equip a main air duct, duct and air distribution assembly comprising at least one such device, associated air duct and method for assembling such an equipped duct

Info

Publication number: EP4168718A1
Application number: EP21733043.0A
Authority: EP
Inventors: Sylvain GRIMAULT; Christophe TARDY
Original assignee: Richel Group
Current assignee: Richel Group
Priority date: 2020-06-19
Filing date: 2021-06-18
Publication date: 2023-04-26
Also published as: US20230304699A1; FR3111683A1; FR3111683B1; AU2021291237A1; WO2021255284A1

Abstract

The present invention relates, in particular, to an air orientation device (100), intended to be coupled to an air discharge opening arranged in a wall of a main air duct, comprising a guide portion (110) configured to guide a secondary air flow originating from said discharge opening. According to the invention, the air orientation device (100) comprises removable fastening means (120) for reversibly fastening the guide portion to said wall of the main air duct.

Description

Title: Removable device for directing secondary air flow intended to equip a main air duct, duct assembly and air distribution comprising at least one such device, associated air duct and method of assembling d 'such a fitted duct

1. Technical field

The field of the invention is that of fluid delivery systems, in particular air conditioning air for greenhouses for growing plants, intended to transport and distribute or diffuse air conditioning air in closed or semi-closed interior volumes, such as cultivation greenhouses in particular.

The invention relates more particularly to a new design principle of air conditioning air ducts according to which the ducts are designed to be equipped with removable accessories easily arranged during installation, in order to ensure a distribution of air flow. configurable and optimized secondary air.

2. Prior art

To control the temperature, humidity or ventilation of a building, it is known to use heating, ventilation and air conditioning systems, commonly called HVAC systems. Such air handling systems traditionally comprise a central air conditioning unit coupled to a network of air ducts making it possible to convey the treated air (that is to say heated, filtered, cooled, etc.) to the air. 'at least one enclosed or semi-enclosed interior volume of the building. Such air ducts further have exhaust openings, arranged in a predefined manner, allowing the treated air to pass from the inside to the outside of the air duct. Each exhaust opening thus allows the creation of a secondary air flow, also called exhaust air flow thereafter, diffusing into the interior volume of the building.

When one or more air conditioning ducts supply a greenhouse, the location of the exhaust openings, and therefore of the secondary air flows evacuated along the main duct through these openings, makes it possible to ensure a distribution predetermined amount of air conditioning in the greenhouse, for example to obtain a air conditioning as homogeneous as possible despite the sometimes very large size of some greenhouses, or on the contrary a targeted zoning of air conditioning.

It has nevertheless been observed that when the discharge openings are simple openings made in a tubular duct, the secondary air flows sometimes take on unwanted orientations. More precisely, depending on various parameters, including their position on the duct, certain air flows do not project perpendicularly to the axis of the main duct, but tend to undergo a more or less inclined orientation with respect to this axis. longitudinal. This effect is possibly increased by the helical mixing imparted by the propulsion fans. Consequently, it has also been observed that this phenomenon of inclination of the evacuated air flows generates disparities, in terms of temperature and humidity in particular, within the interior volume to be air-conditioned.

To overcome this problem, air ducts are known which have members for orienting the evacuated air flows allowing these flows to be straightened perpendicularly to the longitudinal axis of the air duct.

A conventional solution, applicable to metal air ducts, consists in forming such orientation members by stamping, each member being formed by stamping a predetermined portion of the wall of the air duct in order to obtain a frustoconical imprint, protruding therein. towards the outside of the air duct, forming a nozzle for orienting the flow of exhausted air. For flexible air ducts, made of fabric or flexible plastic material for example, such a nozzle for directing the evacuated secondary air flow is obtained by attaching a hollow frustoconical element over the evacuation opening, then to fix this frustoconical element definitively on the flexible air duct by means of an adhesive or a seam.

However, this solution has several drawbacks. The phenomenon of inclined air flow appearing only on certain portion (s) of the air duct, this solution requires the use of several manufacturing processes of the air duct depending on whether an orientation nozzle should be used. or not be spared. In addition, it has been observed that changing the central air conditioning unit and / or adding or removing an air duct in the network in particular can amplify or limit the phenomenon of inclined air flow. However, after manufacture of the air duct with such a multiple process, the arrangement of the orientation nozzles is fixed and may no longer be suitable for the new installation. AT Failure to provide several methods of manufacturing the air duct, the orientation nozzles are provided over the entire air duct, and therefore potentially on portions of the air duct not requiring their presence. This results in a long duration and high manufacturing costs as well as an increase in the size of the duct.

Another known solution, applicable to metal air ducts and to flexible air ducts, consists in making a partial cutout of the discharge opening in the air duct, that is to say that the ends of the cutout do not meet, then fold the cutout portion of the air duct to the outside thereof. Once the cut portion has been folded down, the discharge opening appears while the cut portion intrinsically forms a flap for orienting the flow of discharged air. Such orientation flaps have drawbacks similar to those of the orientation nozzles described above.

Another known solution, applicable to flexible air ducts mainly, consists in forming the air duct via two coaxial ducts arranged one inside the other. Each duct includes discharge openings offset from the discharge openings of the other duct. In such a solution, the member for directing the evacuated air flows is formed by one of the coaxial ducts. The use of two coaxial conduits, in addition to the fact of generating significant pressure drops resulting in high energy consumption, also has drawbacks similar to those of the orientation nozzles described above.

These solutions therefore present, depending on the case, various drawbacks, in terms of efficiency, size, modularity, cost, etc. There is therefore a need for technical solutions making it possible to overcome all or part of these drawbacks.

3. Summary of the invention

The proposed technique relates, according to a first aspect, to an air orientation device, intended to be coupled to an air discharge opening formed in a wall of a main air duct, comprising a portion. guide configured to guide a secondary air flow from the exhaust opening. According to the invention, the characterized air orientation device comprises removable fixing means configured to reversibly fix the guide portion to the wall of the main air duct.

Such removable fixing means make it possible to simplify the installation of the air orientation device on a main air duct. The installation of the air orientation device can in fact be carried out before or after the main air duct has been installed in a closed or semi-closed interior volume, such as a greenhouse for plant cultivation, for example.

Such removable fixing means also make it possible to quickly and easily modify the positioning of the air orientation device on the main air duct according to the preferences of the user.

In addition, the removable fixing means allow simplified maintenance. The removable fixing means make it possible to easily remove and replace a defective or damaged air orientation device.

According to a particular embodiment, the removable fixing means are configured to exert a local force for immobilizing the air orientation device by friction on the wall of the main air duct.

Removable fixing means producing such a frictional force make it possible in particular to ensure effective and lasting fixing of the device to the duct, without damaging, or only slightly, the structure of these two elements. For example, if the main air duct is made of a flexible material, an air directing device made of a rigid material will be preferred. Thus, the friction force will be essentially due to the deformation of the main flexible air duct by the rigid air orientation device. Conversely, if the main air duct is made of a rigid material, an air directing device made of a shape memory material will be preferred. Thus, the frictional force will be essentially due to the deformation of the air orientation device by the main rigid air duct.

In addition, removable attachment means by friction force allows the air orientation device to be fitted to a large panel of standard and / or pre-existing air ducts without requiring definitive structural modifications to the latter, unlike to fixing by screwing, for example. According to another embodiment, the discharge opening and / or the removable fixing means of the air orientation device have a capacity for reversible change of shape between a first position, called a coupling position, which is used for the transient phase of reversible attachment and / or separation of the air orientation device with an exhaust opening, and a second position, called immobilization, which is taken continuously when the orientation device of air is secured to an exhaust opening.

The friction fixing is at least in part due to an elastic deformation of the air directing device and / or of the wall of the main air duct.

According to another embodiment, the removable fixing means are configured to exert a local force for immobilizing the air orientation device by pinching on the wall of the main air duct.

According to a particular aspect, the removable fixing means comprise at least one blade intended to be engaged with the wall of the main air duct in order to produce the removable fixing by friction.

Advantageously, the removable fixing means comprise at least two, preferably three, blades substantially parallel to each other and extending at least partially in a single fixing plane so as to define a main blade and at least one secondary blade, said at least two blades being intended to be engaged in elastic connection with the wall of the main air duct in order to produce the removable attachment by friction.

The main blade is for example intended to be in engagement with an outer surface of the wall of the air duct and the secondary blade or blades are intended to be in engagement with an inner surface of the wall of this same air duct, and this after insertion of the secondary blades through the air discharge opening. For example, if the air duct is made of an elastically deformable flexible material, the main blade allows, via a local deformation force of the wall of the main air duct, to press the wall against the secondary blades. Thus, once the assembly is assembled, the air orientation device is maintained by a friction force.

Removable fixing means having such a structure make it possible to ensure the reversible fixing of the guide portion on the wall of the main air duct without tools. The assembly of the air orientation device on the main duct is therefore simple and not very time-consuming for users, even for the less experienced.

Such a structure of removable fixing means furthermore makes it possible to avoid impacting the main air flow flowing inside the main air duct. After assembly, the blades are pressed against and extending along the wall of the duct. Thus, the main air flow cannot effectively, or only slightly, engage with the removable fixing means.

According to another particular aspect, the guide portion extends along a longitudinal axis and in that the main blade and said secondary blades are integral with a longitudinal end of the guide portion.

Such a structure of the air orientation device allows the guide portion not to impact, or only slightly, the main air flow flowing inside the main air duct. After assembly, only a reduced part of the guide portion, namely that carrying the main and secondary blades, is located in the interior volume of the main air duct. Thus, the air orientation device does not generate any loss of load, or in a very small way, of the main air flow.

According to another particular aspect, the guide portion has a tubular shape, and the central blade and said lateral blades extend perpendicularly to the longitudinal axis of the guide portion.

The tubular guide portion, which is dimensioned to match the shape and dimensions of the air exhaust opening in the wall of the main duct, extends the entire inner periphery of the exhaust opening d. air (like the nozzles of the solutions of the state of the art).

Such a tubular section of the guide portion makes it possible to dispense with a particular direction of installation of the air orientation device on the wall of the main air duct. This results in particular in easy installation of the air orientation device and in an increase in the longevity of the main air duct (by varying the positioning of the removable fixing means).

According to another particular aspect, the air orientation device comprises additional retaining means, typically by stopper or snap-fastening, configured to ensure the reversible fixing of the guide portion on the wall of the main air duct in a complementary manner. to said friction fixing. Such additional retaining means exert a force complementary to the friction force so as to maintain and / or lock the reversible fixing of the guide portion of the air orientation device on the wall of the main air duct. By increasing the number of reversible fasteners, produced by forces of various kinds, the risk of untimely extraction of the removable fastening means is minimized. For example, in some greenhouses, the main air duct is placed at breast height. Such additional retaining means therefore make it possible to minimize the risk that a user, striking the duct for example, tears off the air orientation device, in particular causing irreversible deterioration of the device and / or of the wall of the duct. Such untimely extractions can in particular be generated by the main air flow circulating inside the main air duct.

Advantageously, the additional retaining means are two projections extending on either side of the guide portion so as to locally widen the guide portion.

Such retaining means allow the guide portion to locally have a greater width than the diameter of the air discharge opening. Thus, after the retaining means have been inserted inside the air duct (via an elastic deformation of the wall thereof, for example), these retaining means oppose the extraction movements of the device. air orientation.

Such retaining means make it possible to reinforce the reversible fixing in a simple, rapid and inexpensive manner.

According to a particular aspect, the secondary blades each carry one of the projections forming additional retaining means.

Such an arrangement of the additional retaining means makes it possible to simplify the manufacture of the air orientation device.

According to another particular embodiment, the guide portion has an outer peripheral wall of tubular shape and the removable fixing means comprise two collars mutually parallel and integral with the outer peripheral wall of the guide portion so as to define a collar. upper spaced by a lower flange. In addition, the lower flange has a notch intended for the passage of the wall of the main air duct between the upper and lower flanges. Such removable fixing means allow the assembly and disassembly of the air orientation device, on the main air duct and from the outside thereof, by a rotational movement substantially producing the effect of 'a screwing. Indeed, after having inserted a first end of the lower flange in the air discharge opening of the duct, the user rotates the air orientation device allowing the wall of the air duct to gradually insert between the upper and lower flanges. At the end of this rotation, the wall of the main air duct is then trapped between the two flanges. Such removable fixing means therefore make it possible to ensure simple, rapid and robust assembly (and disassembly) of the air orientation device on the wall of the main air duct, without requiring any tools.

According to a particular aspect, the flanges are spaced from one another along the axis of the guide portion and define between them a space suitable for accommodating the peripheral edge of the wall of the main air duct.

Thus, after assembly, the wall of the main air duct is placed, or even clamped, between the lower and upper flanges.

According to a particular aspect, the guide portion has an annular section. This makes it possible in particular to have a uniform deformation of the air orientation device and / or of the wall of the main air duct.

According to another particular aspect, the lower flange is flush with one end of the guide portion.

Such a structure of the air orientation device allows the guide portion not to impact, or only slightly, the main air flow flowing inside the main air duct. After assembly, only a small part of the guide portion, namely that bearing the flanges, is located in the interior volume of the main air duct. Thus, the air orientation device does not generate any loss of load, or in a very small way, of the main air flow.

According to another particular aspect, the air orientation device is made in one piece.

Thus, the user is freed from one or more assembly operations of the parts forming, after assembly of these parts on the wall of the main air duct, the air orientation device. This also makes it possible to prevent the user from losing component parts of the air orientation device and therefore having to search for them. This therefore results in a simplification of the assembly and disassembly of the air orientation device is simplified.

According to another particular aspect, the lower collar has two free ends, delimiting the notch, and in that the ends are symmetrical with respect to a median plane passing through the axis of the guide portion located between said ends.

Such symmetry makes it possible in particular to simplify the assembly / disassembly of the air orientation device on the wall of the main air duct by allowing the device to be rotated both clockwise and counterclockwise.

Alternatively, the lower collar has two free ends, delimited by the notch, and the ends are asymmetrical with respect to a median plane passing through the axis of the guide portion located between the ends.

Such an asymmetry allows in particular the most convergent end, ie the end with the longest edge and the most progressive leak, to initiate the installation of the air orientation device on the wall of the duct. main while the less converging end minimizes deformation of the wall of the main air duct and simplifies disassembly of the air steering device.

Advantageously, said ends converge towards one another in the direction of said outer peripheral wall of the guide portion.

In other words, the ends of their free edges are closer to each other near the outer peripheral wall of the guide portion, while their free edges move away from each other. from the outer peripheral wall of the guide portion towards the peripheral edge of the collar.

Advantageously, the ends of the lower flange are of convex shape.

Such a shape of the ends makes it possible to minimize the risks of degradation of the flexible wall of the main duct and / or of the air orientation device. This ensures a long service life of the main air duct and / or of the air orientation device. The proposed technique relates, according to a second aspect, to an air duct and distribution assembly comprising:

a main air duct, the wall of which has a plurality of secondary air discharge openings therethrough; and,

- at least one device for directing secondary air coupled to one of the exhaust openings, each device for directing air comprising a portion for guiding a secondary air flow coming from the exhaust opening associated with the air orientation device and removable fixing means of the guide portion to the wall of the air duct.

Such removable fixing means make it possible to install, modulate and adapt the positioning of the air orientation device on the air duct according to the preferences of the user. Such an assembly allows the user to be able to position the air orientation devices after installation of the air duct, that is to say after coupling to a central air conditioning unit or connection to the network of air ducts. air. Such an assembly therefore allows the user to choose on which air discharge openings he wishes to attach a removable air orientation device, in particular as a function of the blower conditions.

Furthermore, air orientation devices comprising such removable fixing means make it possible to minimize the bulk of the assembly, during storage thereof for example, and to simplify handling. By separating the air orientation devices, the main air duct can in fact be easily installed in a closed or semi-enclosed interior volume without risk of damaging one or more air orientation devices by example.

According to a particular embodiment, the removable fixing means comprise at least two, preferably three, blades substantially parallel to each other and extending at least partially in a single fixing plane, so as to define a main blade and at least one. secondary blade, and in that the main blade is in resilient connection with an outer surface of the wall of the main air duct and said at least one secondary blade is in resilient connection with an inner surface of the wall of the air duct .

According to a particular aspect, the main air duct is configured to carry a main flow of air in a predefined direction, and the main blade and said at least one secondary blade are oriented in the predefined direction of the main air flow.

Such an orientation of the blades makes it possible to prevent the main flow of air circulating inside the air duct causing the untimely extraction of the air orientation device. On the contrary, such an orientation makes it possible to ensure the reversible fixing of the air orientation device on the wall of the main air duct. The main air flow indeed exerts a pressure of the guide portion against the inner periphery of the air discharge opening.

According to another particular aspect, the plurality of exhaust openings is distributed along the main air duct having a predetermined length, and each exhaust opening located in a first longitudinal zone of the main air duct carries a device. air orientation.

Such an arrangement of the air orientation devices makes it possible to straighten all of the secondary air flows in a specific zone of the main air duct subject to the phenomenon of inclined exhaust air flow. Such an arrangement therefore makes it possible to reduce the costs of the entire duct and distribution, in particular by dispensing with the installation of air orientation devices on areas of the main air duct in which the flow phenomenon inclined exhaust air does not appear or only slightly.

Advantageously, the first longitudinal zone has a length comprised between a fifth and half of the length of the main air duct, and the first longitudinal zone is located at a longitudinal end of the main air duct, the longitudinal end of the main air duct being intended to be coupled to a central air conditioning unit.

Such an arrangement of the air orientation devices makes it possible to straighten out all of the secondary air flows in the area of the main air duct that is most affected by the phenomenon of inclined exhaust air flow, that is to say. ie the area located directly at the outlet of the air conditioning unit. The length of the first longitudinal zone obviously depends on the wind tunnel conditions.

According to another advantageous aspect, the main air duct comprises a second longitudinal zone, distinct from the first longitudinal zone, in which certain discharge openings respectively carry an orientation device. air, and a third longitudinal zone, distinct from the first and second longitudinal zones, in which the exhaust openings are devoid of an air orientation device.

Advantageously, the first, second and third zones are in succession from one another. The phenomenon of inclined exhaust air flow gradually fades as the main air flow propagates inside the main air duct, it is not necessary to equip the assembly air orientation device exhaust openings. Such a regressive arrangement of the air orientation devices also makes it possible to minimize the costs of the assembly by in particular dispensing with the installation of air orientation devices on areas of the main air duct devoid of the air duct. inclined exhaust air flow phenomenon.

The proposed technique relates, according to a third aspect, to an air duct of the type intended for use in a duct and distribution assembly as described above.

The proposed technique further relates to a method of assembling a pipe and distribution assembly as described above according to a particular aspect, comprising the following steps: insertion, from outside the main air duct, of 'at least one secondary blade through the secondary air discharge opening; engaging the main blade with an exterior surface of the wall of the main air duct and engaging said at least one secondary blade with an interior surface of the wall of the main air duct; and sliding the main blade and said at least one secondary blade along the wall of the main air duct until the guide portion abuts against a periphery of the air discharge opening associated secondary.

Such a method allows a simple, efficient and not very time-consuming assembly of an air orientation device according to a particular embodiment of the proposed technique. 4. List of figures Other characteristics and advantages of the invention will emerge more clearly on reading the following description, given by way of simple illustrative and non-limiting example, and the appended drawings, among which:

[Fig.lA], [Fig.lB], [Fig.lC], [Fig.lD], [Fig.lE] and [Fig.lF]: Figures IA to 1F represent, in different views, an example of reversible fixing air orientation device according to a first embodiment of the proposed technique;

[Fig.2]: Figure 2 shows, in a partial perspective view, an example of an assembly of air duct and distribution having a main air duct equipped with a plurality of orientation devices of air with reversible attachment according to the first embodiment of the proposed technique;

[Fig.3]: Figure 3, which is a sectional view of Figure 2, illustrates an example of angular positioning of the secondary air discharge openings on the periphery of the main air duct;

[Fig.4]: Figure 4 shows, in a side view, an example of the longitudinal distribution of air orientation devices with reversible attachment to the secondary air discharge openings of the main air duct;

[Fig.5A] and [Fig.5B]: Figures 5A and 5B illustrate the positioning of the removable fixing means of a secondary air orientation device on the wall of the main air duct;

[Fig.6]: Figure 6 shows, in a longitudinal and partial sectional view of an assembly according to Figure 2, the function of orientation and guidance of a secondary air flow produced by a device. secondary air orientation in accordance with the proposed technique;

[Fig.7A] and [Fig.7B]: Figures 7A and 7B show, in different views, an example of a reversible fixing air orientation device according to a second advantageous embodiment of the proposed technique;

[Fig.8]: Figure 8 shows, in a perspective view, an example of a reversible fixing air orientation device according to a third advantageous embodiment of the proposed technique;

[Fig.9]: Figure 9 shows, schematically, an example of removable fixing means according to a fourth advantageous embodiment of the proposed technique; [Fig.lOA] and [Fig.lOB]: FIGS. 10A and 10B represent, in different views, an example of an air orientation device with reversible fixing according to a fifth embodiment of the proposed technique;

[Fig.llA] and [Fig.llB]: FIGS. 11A and 11B represent, according to different perspective views, an example of an air orientation device with reversible fixing according to a sixth embodiment of the proposed technique;

[Fig.12A] and [Fig.12B]: Figures 12A and 12B each show an example of a reversible fixing air orientation device according to a seventh embodiment of the proposed technique;

[Fig.13A] and [Fig.l3B]: Figures 13A and 13B illustrate distributions of secondary air discharge openings in the main air duct alternative to that illustrated in Figure 3; and

[Fig. 14]: FIG. 14 illustrates, according to a schematic representation seen from above, an example of the distribution of air orientation devices with reversible fixing on the secondary air discharge openings alternative to that illustrated in FIG. 4.

5. Detailed description of the invention

Subsequently, the same elements have been designated by the same references in the various figures.

5.1 General principle

The proposed technique is based on a new approach to the design and implementation of air orientation devices having a guide portion which provides predetermined guidance of secondary air (or "bypass") from a. main air flow circulating in a main air duct. This type of secondary air orientation device is intended to be coupled to an air discharge opening formed in the wall of the main air duct. The new technique of the invention presents various embodiments which can be implemented depending on whether the wall of the main duct is made of a rigid material or of an elastically deformable flexible material.

The invention uses in particular removable fixing means making it possible to fix the guide portion in a reversible manner to the wall of the main air duct. The proposed technique also relates to an air duct and distribution assembly comprising:

- at least one device for directing secondary air coupled to one of the exhaust openings, each device for directing air comprising a portion for guiding a secondary air flow coming from the exhaust opening associated with the secondary air orientation device and removable fixing means of the guide portion to the wall of the main air duct.

Such removable fixing means thus make it possible to simplify the assembly, the modulation and / or the modification of the positioning of a device for directing secondary air on a main air duct according to the preferences of the user, and this without degrading the structure of the air duct carrying the air orientation device.

So as to be able to be implemented on a large panel of standard and / or pre-existing air ducts without requiring structural modifications of the latter, the reversible fixing is preferably carried out by a local force of immobilization of the orientation device. air by friction on the wall of the main air duct. Such a frictional force is obtained by a local deformation, elastic more precisely, of the wall of the main air duct and / or of the removable fixing means.

Such a friction fixing can be obtained via removable fixing means having various materials and / or structures, some of which are described below for purely illustrative purposes.

5.2 Description of an illustrative embodiment 5.2.1 Removable air orientation device

FIGS. 1A to 1F represent, in different views, an example of an air orientation device according to a first embodiment of the proposed technique.

The air orientation device 100, which is intended to be coupled to an air discharge opening 12 formed in a wall 11 of a main air duct 10, as illustrated in FIG. 2 in particular, comprising a guide portion 110 intended to guide and direct a secondary air flow issuing from the discharge opening 12 associated with the air orientation device 100. According to the proposed technique, the air orientation device 100 comprises removable fixing means 120, secured to the guide portion 110, intended to reversibly fix the guide portion 110 to the wall of a main duct d 'air 10.

To do this, the removable fixing means 120 are configured to exert a local force for immobilizing the air orientation device 100 by friction on said wall of the main air duct.

In addition, the air orientation device 100 comprises additional retaining means 130 _A , 130 _b , by stopper, latching or screwing for example, configured to ensure or reinforce the reversible fixing of the guide portion 110 on the wall. 11 of the main air duct 10. In other words, such additional retaining means 130 _A , 130 _B make it possible to maintain and / or lock the reversible fixing of the guide portion 110 on the wall 11 of the main duct. air 10 so as to prevent any untimely removal of the removable fixing means 120.

In the example illustrated, the air orientation device 100 is produced as a single piece in a rigid material advantageously exhibiting the following properties: high resistance to corrosion, to chemical agents, to ultraviolet rays, sufficient flexibility to allow insertion through the wall and high mechanical resistance. Preferably, the air orientation device 100 is made of a rigid macromolecular plastic material exhibiting such properties. More preferably, the air orientation device 100 is made of a thermoplastic material, for manufacture thereof by injection into a mold or by printing, intrinsically exhibiting and / or by complementary treatment of such properties. Thus, in the example illustrated, the air orientation device 100 is made of polyethylene terephthalate. Any other plastic material exhibiting such properties, such as polypropylene, polyoxymethylene or a polyamide for example, can nevertheless be considered.

According to another solution, the air orientation device 100 can be produced as a single piece in a metallic material having, intrinsically and / or by treatment, the aforementioned properties. For example, the air orientation device 100 is made of 304 stainless steel, 5086 aluminum or brass. An air orientation device is made of a metallic material can in particular be considered when the wall of the main air duct is thick enough to avoid any risk of it tearing by the device.

According to yet another solution, the air orientation device 100, having to cooperate with a wall made of rigid material, is made of a shape memory material having elastic properties, such as polyurethane for example.

As illustrated, the guide portion 110 is tubular in shape, extending along a longitudinal axis X, and has an annular cross section. The guide portion 110 has a first longitudinal end 110A and a second longitudinal end 110 _B , opposite to the first longitudinal end 110A. The guide portion 110 has an outer diameter of a value equal to or substantially greater than the value of the diameter of the circular discharge opening to receive the air orientation device 100.

Such a dimensioning and such a geometry of the guide portion 110 make it possible to dispense with a particular direction of installation of the air orientation device 100 on the wall of the main air duct, in order to achieve its function of orientation and guidance of the associated secondary air flow. In other words, the function of orienting and guiding the associated secondary air flow is performed whatever the angular position of the guide portion and whatever the tangential component of the speed of the main air flow. reaching the secondary air discharge opening.

More precisely, the guide portion 110 is advantageously a hollow frustoconical tube, the largest diameter of which, corresponding to the first longitudinal end 110A, is of a value equal to or substantially greater than the value of the diameter of the discharge opening to receive the air orientation device 100. Preferably, the guide portion 110 has substantially identical values of length and maximum outside diameter.

By mechanically coupling the first longitudinal end 110A (the widest) of the guide portion 110 to the discharge opening 12, as illustrated in FIG. 6 in particular, the frustoconical shape, the diameter of which is reduced by moving away of the main duct, makes it possible to significantly reduce the flow rate in the guide portion of the secondary air flow issuing from this discharge opening.

Furthermore, in this preferred embodiment, the removable fixing means 120 consist of three blades 121, 122, 123 having respectively a first longitudinal end 121A, 122A, 123A free and a second longitudinal end 121 _B , 122 _B , 123 _B integral with the guide portion 110. More specifically, the blades 121, 122, 123 are integral with the first end 110A wide of the guide portion 110 and extend perpendicularly to the longitudinal axis X of the guide portion 110. In other words, the blades 121, 122, 123 locally and radially extend the wide end 110A of the guide portion 110 .

The blades 121, 122, 123 are spaced apart from each other, substantially parallel to each other and extend at least partially in a single fixing plane P, as illustrated in FIGS. IB and 1F in particular. Advantageously, the blades 121, 122, 123 extend in the same direction from the guide portion 110.

Thus, in this embodiment, the removable fixing means 120 comprise a main blade 121, called the central blade, and two secondary blades 122, 123, called side blades. The side blades 122, 123 are arranged symmetrically with respect to the central blade 121 to simplify the installation of the air orientation device on the main air duct.

More precisely, the central blade 121 is intended to be in engagement with an outer surface _11E of the wall 11 of the main air duct 10 while the side blades 122, 123 are intended to be in engagement with an inner surface 11i of the wall 11 of this same main air duct 10, as illustrated in FIG. 6 in particular.

The first longitudinal ends 122A, 123A of the side blades 122, 123 respectively, which are symmetrical with respect to the central blade 121, form partially rounded tips. Such points allow the free longitudinal ends 122A, 123A of the side blades 122, 123 to be narrower than the guide portion 110, as illustrated in FIG. 1D, so as to simplify the insertion of the secondary blades 122, 123 in a discharge opening.

In addition, FIG. 1E shows in particular the fact that the main blade 121 has a length LLP having a first predetermined value and that the secondary blades 122, 123 respectively have a length LLS having a second predetermined, less than the predetermined value of the length LLP of the main blade 121.

Such sizing of the main 121 and secondary blades 122, 123 makes it possible to simplify the installation of the air orientation device 100 on the wall of the air duct. 10. Such a difference in length of the blades indeed allows the main blade to be easily deformable (elastically). Thus, by punctually pressing the free end 121 _A of the main blade 121 against the outer surface 11 _E of the wall 11 of the main air duct 10, the main blade 121 is temporarily moved away from the secondary blades 122, 123. The blade main 121 thus forms a guide element making it possible to simplify the insertion of the secondary blades 122, 123 through the discharge opening 12.

In the example illustrated, the main blade 121 has a length L _LP of 3cm and the secondary blades 122, 123 respectively have a length L _LS 2cm. Obviously, the dimensions of the main and secondary blades are adjustable.

Furthermore, additional retaining means 130A, 130 _B are provided in the form of two projections extending on either side of the guide portion 110 so as to locally widen the latter. More precisely, the projections 130A, 130 _b extend at least partially in the fixing plane P, as illustrated in FIG. 1F in particular.

Thus, the projections 130A, 130 _B allow the guide portion 110 to locally have a total width l _T greater than the initial width h of the guide portion 110. The expression “initial width” denotes, in this embodiment , the diameter of the wide end 110 _A of the frustoconical guide portion 110.

In the example illustrated, the projections forming additional retaining means 130A, 130 _B are carried by the side blades 121, 122.

According to another solution, the additional retaining means can be formed by latching elements. According to yet another solution, the additional retaining means may be formed by a fixing member, typically a rivet, passing through the central blade and the wall of the duct for mutual securing of these two elements.

5.2.2 Air duct and distribution assembly equipped with removable air orientation devices

FIG. 2 represents, in a partial perspective view, an example of an assembly of air duct and distribution according to the invention comprising a main air duct, provided with secondary air discharge openings, equipped with a plurality of secondary air orientation devices according to the first embodiment of the proposed technique as described above. The duct and distribution assembly 200 comprises a main air duct 10, having a wall 11, inside which flows a main air flow FP generated by a central air conditioning unit 20 (visible in FIG. 4) coupled to one end of the main air duct 10.

The conduit and distribution assembly 200 further comprises a plurality of secondary air directing devices 100, each coupled to an exhaust opening 12, and in accordance with the proposed technique. In other words, each air orientation device 100 comprises on the one hand a guide portion 110 of a secondary air flow, issuing from the discharge opening 12 associated with the orientation device d. secondary air 100, and on the other hand removable fixing means 120 of the guide portion 110 to the wall 11 of the main air duct 10.

As illustrated, the main air duct 10 advantageously has a tubular shape, of annular section, extending along a longitudinal axis corresponding to the axis of revolution A _R of the main air duct 10.

In addition, the main air duct 10 comprises a wall 11 made of a flexible material, through which a plurality of air discharge opening 12, of circular shape, are formed.

In the example provided by way of nonlimiting illustration, the wall 11 is made of a flexible plastic, such as polyethylene for example. According to another solution, the wall 11 can be made of fabric.

Further, the exhaust openings 12 are distributed along the main air duct 10 at constant intervals and each exhaust opening 12 is configured to be traversed by a secondary air flow FS intended to be diffused in one direction. predetermined within a closed or semi-closed interior volume such as that of a greenhouse for plant cultivation. According to another solution, the discharge openings 12 may however be distributed along the main air duct at variable intervals, for example according to increasing intervals or according to another specific distribution rule, so as in particular to optimize the distribution of air. the distribution of secondary air within a closed or semi-closed interior volume.

Furthermore, in this example, the air orientation devices 100 conform to the first embodiment of the proposed technique. Figure 3 is a cross-sectional view along the CC plane of an advantageous embodiment of an assembly of duct and air distribution as described in relation to Figure 2, and illustrates an example of angular positioning of the secondary air discharge openings on the periphery of the main air duct, and therefore ultimately that of all or part of the secondary air orientation devices.

The main air duct 10, of tubular shape and of annular section, has an axis of revolution A _R extending in a horizontal plane PH, parallel to the ground S, after installation of the assembly in a closed interior volume or mid -closed.

Each secondary air discharge opening 12 is formed in the wall 11 of the main air duct 10 in at least one angle sector a with respect to the horizontal plane PH. The angle a is between 0 ° and 45 °, preferably between 0 ° and 30 °.

As illustrated, the main air duct 10 has four series of discharge openings 12i, 12 ₂ , 1 ₃ , 1 ₄ distributed along the wall 11. Obviously, the number of series of openings d The evacuation is adjustable according to the needs of the user.

The main air duct 10 has first and second series of discharge openings 12i, 12 ₂ formed in a right lateral portion 11 _D of the wall 11. Each first and second series of discharge openings 12i, 12 ₂ is formed in an angular sector, of approximately 25 °, located in the upper part of the wall 11, that is to say above the horizontal plane PH. More precisely still, the first series of discharge openings 12i is formed at an angle of 0 ° with respect to the horizontal plane P _H and the second series of discharge openings 12 ₂ is formed at an angle of 25 ° by relative to the horizontal plane PH.

Similarly, the main air duct 10 has third and fourth series of exhaust openings 12 ₃ , 12 ₄ formed in a left side portion 11G of the wall 11. Each third and fourth series of exhaust openings. discharge 12 ₃ , 12 ₄ is provided in an angular sector, of approximately 25 °, located in the upper part of the wall 11, that is to say above the horizontal plane PH. More precisely still, the third series of discharge openings 12 ₃ is formed at an angle of 0 ° with respect to the horizontal plane P _H and the fourth series of discharge openings 12 ₄ is formed at an angle of 25 ° with respect to the horizontal plane PH. In in other words, the air discharge openings are distributed symmetrically with respect to a vertical plane passing through the axis of revolution A _{R of} said duct.

Such an arrangement of the secondary air discharge openings 12 makes it possible in particular to minimize the risk of untimely extraction or tearing of the air orientation devices when users pass near the main air duct. This is all the more true in particular when the air discharge openings, and therefore the associated air orientation devices, move away from a vertical axis Avr tangent to the outer periphery of the wall of the duct to the duct. main air 10, that is to say when the air discharge openings are located at a distance from the horizontal plane PH.

Obviously, a person skilled in the art will know how to adapt the arrangement of the secondary air discharge openings 12 in particular according to the diameter of the main air duct and / or the location of the latter in a closed interior volume or half-closed.

FIG. 4 is a schematic representation in a longitudinal plane of an advantageous embodiment of an installation comprising an assembly of duct and air distribution in accordance with the proposed technique. This figure illustrates an example of the longitudinal distribution of the secondary air orientation devices on secondary air discharge openings along a main air duct.

The installation comprises a central air conditioning unit 20 coupled, mechanically and fluidly, to a first longitudinal end 10A of the main air duct 10 and a cover 30 coupled, in a mechanical and fluid manner, to a second longitudinal end 10 _B , opposite to the first longitudinal end 10A, of the main air duct 10.

The central air conditioning unit 20 is configured to generate a main air flow FP of treated air flowing inside the main air duct 10.

The cover 30 is configured to prevent the main air flow FP from exiting through the second longitudinal end 10 _B of the main air duct 10, or at the very least to limit the escape of this air flow if the orifices d 'air evacuation are provided through it for example. In other words, the cover 30 makes it possible to force the main air flow FP to evacuate into the closed or semi-closed interior volume through the air evacuation openings 12 intended for this purpose. The main air duct 10, of predetermined length Lio, has a plurality of air exhaust openings 12 distributed in different series of exhaust openings (of which only the first and second series of exhaust openings 12i, 122 are visible) extending along the longitudinal axis of the air duct 10 and over the entire length thereof. It can nevertheless be noted that the invention does not exclude the case where only a part of the duct is equipped with openings.

More precisely, in the embodiment shown, the main air duct 10 is organized, that is to say stepped, or cut in a fictitious manner, into several successive longitudinal zones or portions, each zone comprising a determined configuration of the openings d. 'evacuation 12. In a determined longitudinal zone, the determined configuration of the evacuation openings 12 corresponds to subseries of the evacuation openings originating respectively from the different series of the evacuation openings (of which only the first and second series of discharge openings 12i, 122 are visible).

In this way, each zone or longitudinal portion of the duct can have a specific configuration of the openings on the one hand, and of the air orientation devices 100 on the other hand, to obey optimal and configurable distribution patterns in such a way. optimum air treatment within the closed or semi-closed interior volume, ie typically a greenhouse for plant cultivation.

In the example illustrated, the main air duct 10 is fictitiously separated into three portions or longitudinal zones, namely a first longitudinal zone PCI, a second longitudinal zone PC2, succeeding the first longitudinal zone PCI, and a third longitudinal zone PC3, succeeding the second longitudinal zone PC2.

In the first longitudinal zone PCI, located at the first longitudinal end 10A of the air duct 10, each (not visible) air discharge opening is equipped with an air orientation device 100. The first portion longitudinal PCI has a length L _P ci of between one fifth and half of the length Liod of the main air duct 10.

In the second longitudinal zone PC2, only certain exhaust openings 12 are equipped with air orientation devices 100. As illustrated, only the exhaust openings 12 belonging to the second series of exhaust openings 12. ₂ are equipped with air orientation devices 100. The second portion longitudinal PC2 has a length L _P c2 corresponding substantially to one tenth of the length Liodu main air duct 10.

In the third longitudinal zone PC3, all the exhaust openings 12 are devoid of an air orientation device.

It has been observed that the phenomenon of inclined secondary air flow, creating "hot spots" in the closed or semi-enclosed interior volume, appears essentially at the outlet of the central air conditioning unit and then diminishes as the Primary air flow propagates within the primary air duct.

The new distribution of the air orientation devices on the main air duct, as authorized by the invention, therefore makes it possible to target the zones in which the rectification of the secondary air flows must be implemented. More generally, the new design of both the main air ducts and their equipment accessories, which are the secondary air orientation devices, makes it possible to expand the possibilities for installing duct and distribution assemblies. air, and simplify their implementation. In particular, during installation, the design of the ducts and devices makes it possible to limit material and human resources, in particular the number of air orientation devices and therefore the time required for their installation, while offering efficient air treatment. This therefore results in a reduction in the production costs of the assembly.

In addition, the removable nature of the air orientation devices according to the invention not only facilitates their targeted placement, but also their removal or movement. For example, in the same greenhouse for plant cultivation, it will be very simple to organize other distributions of the air orientation devices on the main air duct as a function in particular of the power of the air conditioning unit and / or the configuration of the main air duct (which can be integrated into a network of air ducts, for example).

FIG. 5A is a partial sectional view of a secondary air orientation device according to the invention, and of its positioning on the wall of the main air duct after assembly, and of its interactions in the context of a pipe and distribution assembly according to Figure 2. Figure 5B, which is a focused view of a zone ZI of the wall of the main air duct of a pipe and distribution assembly according to Figure 2, shows also in light of such interactions. As illustrated, the central blade 121 of the removable fastening means 120 engages an outer surface _11E of the wall 11 of the main air duct 10 and the side blades 122, 123 engage with a surface. interior 11 of the wall 11 of the same main air duct 10.

Due to the fact that the central 121 and lateral blades 122, 123 extend partially in the same fixing plane P, such an arrangement of the removable fixing means 120 on the wall 11 of the main air duct 10 makes it possible to create a local deformation. of the wall 11 of the main air duct 10. This local deformation, causing a tension in the wall, allows the creation of a frictional force between the wall 11 of the main air duct 10 and the central and lateral blades 121 122, 123 sufficient to immobilize the assembly.

The local deformation of the wall 11 of the main air duct 10 also makes it possible to reduce the diameter of the discharge opening 12. Thus, the outline of the discharge opening is tighter against the guide portion 110. of the air orientation device 100. This results in an improvement in the retention of the air orientation device 100 on the main air duct 100 as well as in the production of the seal between these two elements.

FIG. 6 is a view in partial longitudinal section of a pipe and distribution assembly according to FIG. 2, and illustrates the function of orientation and guidance of a secondary air flow produced by an orientation device of secondary air in accordance with the proposed technique.

The arrow in thin lines represents the direction of a first secondary air flow FSi issuing from a secondary air discharge opening 12 without any secondary air orientation device in accordance with the proposed technique.

The arrow in bold line represents the direction of a second secondary air flow FS issuing from the same secondary air discharge opening 12 after attachment of a secondary air orientation device 100 in accordance with the technique. proposed.

It can thus be seen that the guide portion 110 of the air orientation device 100 makes it possible to straighten the second secondary air flow FS so as to form an angle b with respect to an axis perpendicular to the direction of flow of the flow d 'main air FP inside the wall 11. In the illustrated embodiment, this perpendicular axis corresponds substantially to the longitudinal axis X of the guide portion 110. More precisely, the guide portion 110 is configured to define an angle b of between 0 ° and 20 °, preferably 10 °. Such values of the angle b make it possible to considerably reduce, or even eliminate, the “hot spot” phenomenon due to the inclined air flows (represented by the first secondary air flow FSi).

Furthermore, Figure 6 shows the fact that the central 121 and side blades, of which only the side blade 122 is visible, are oriented in the direction of the main air flow FP inside the main air duct. 10. Obviously, other orientations of the blades can be envisaged as soon as the guide portion performs a function of orientation and guidance of the secondary air flow. For example, the blades can be oriented perpendicular to the longitudinal axis of the main air duct so as to be oriented towards a left or right lateral side of the duct.

5.2.3 Assembly process for an air duct and distribution assembly equipped with removable air orientation devices

The method of assembling an air duct and distribution assembly as described in relation to FIGS. 2 to 6, comprises the following steps: insertion, from the outside of the main air duct 10, of the blades lateral 122, 123 through a secondary air discharge opening 12; engaging the central blade 121 with an outer surface 11 _E of the wall 11 of the main air duct 10 and engaging the side blades 122, 123 with an inner surface 11 of the wall 11 of the main air duct 10 ; and sliding of the central 121 and lateral blades 122, 123 along the wall 11 of the main air duct 11 until the guide portion 110 abuts against the inner periphery of the discharge opening 12 d associated secondary air.

At the end of the sliding step, the central blade 121 exerts a frictional force on the outer surface II _E of the wall 11 and the side blades 122 respectively exert a frictional force on the inner surface 111 of the wall 11 .

Thus, it appears that the mounting of an air orientation device, according to the first embodiment of the proposed technique, on a main air duct is easy, not very time-consuming and does not require any tools.

It is further noted that the wall 11 of the main air duct exhibits a reversible change of shape between a first position, called the coupling position, and a second position, called the immobilization position. The coupling position corresponds to a position in which the wall 11 is not stressed, that is to say that the wall is not elastically deformed, and the main and secondary blades 121, 122, 123 are engaged. with the outer and inner surfaces 11 _E, 11 respectively of the wall 11.

The immobilized position corresponds to a position in which, after sliding of the removable fixing means, the wall 11 is elastically deformed by the pressure exerted by each of the main and secondary blades 121, 122, 123.

Furthermore, to simplify assembly, a guiding step, prior to the steps previously described, of the side blades 122, 123 can be envisaged.

The guiding step consists in punctually pressing the free end 121 _A of the main blade 121 against the outer surface 11 _E of the wall 11 of the main air duct 10 so as to move the main blade 121 apart (by an elastic deformation of the latter) of the secondary blades 122, 123. Thus, the insertion and engagement steps can be carried out by a progressive folding of the air orientation device 100 towards the wall 11.

The extraction of the air orientation device is carried out by performing, in reverse order, the steps described above.

More precisely, the extraction of the air orientation device is carried out by a pivoting / rotation of 90 ° of that so as to bring the junction plane P of the main and secondary blades 121, 122, 123 to be perpendicular to the 'longitudinal axis A _R of the main air duct. Thus, the discharge opening 12 is elastically deformed, temporarily, to allow the passage of additional retaining means and therefore the extraction of the main and secondary blades 121, 122, 123. Such extraction of the orientation device air 100 is preferably produced under the effect of a lateral rocking movement, from left to right, accompanied by rear traction (that is to say in the direction opposite to the direction of projection of the blades).

5.3 Alternative embodiments and optional features

FIGS. 7A and 7B illustrate, according to different perspective views, an example of an air orientation device according to a second advantageous embodiment of the proposed technique.

In this second embodiment, the air orientation device 700, made of a rigid material, comprises a guide portion 710 having a section transverse in a circular arc, the shape of which allows it to be pressed against the inner periphery of a circular air discharge opening.

The air orientation device 700 comprises a guide scoop 730 formed in the extension of the lower end 710 _A of the guide portion 710. The guide scoop 730 is configured to be introduced through an opening air outlet formed in the wall of an air duct and protrude into the interior volume of the main air duct. Such a guide scoop 730 thus makes it possible to increase the flow rate of the secondary air flow exiting through the air discharge opening coupled to the orientation device 700.

In this embodiment, the removable fixing means 720, making it possible to exert a local force for immobilizing the device by friction on the wall of the main air duct, comprise three blades 721, 722, 723 which are substantially parallel to each other and extending at least partially in a single fixing plane. The removable fixing means 720 thus comprise a main blade 721, called the central blade, and two secondary blades 722, 723, called side blades.

The central blade 721 is configured to engage an interior surface of the resiliently deformable flexible wall of the air duct while the side blades 722, 723 are configured to engage an exterior surface of the wall thereof. same air duct, and this after insertion of the central blade 721 through an air discharge opening.

The assembly of the air orientation device 700 on a wall of a duct comprising at least one outlet opening for a secondary air flow comprises the following steps: insertion, from the outside of the duct of air, from the central blade 721 through the discharge opening; engaging the central blade 721 with an interior surface of the wall of the air duct and engaging the side blades 722, 723 with an exterior surface of the flexible wall of the air duct; and sliding the blades 771, 722, 723 along the wall of the air duct until the guide portion abuts against an inner periphery of the discharge opening. In this embodiment, the wall of the main air duct also has a reversible change of shape between a first position, called coupling, and a second position, called immobilization. The coupling position corresponds to a position in which the wall is not stressed and the main and secondary blades 721, 722, 723 are in engagement with the interior and exterior surfaces respectively of the wall. The immobilized position corresponds to a position in which, after sliding of the removable fixing means, the wall is elastically deformed by the pressure exerted by each of the main and secondary blades.

721, 722, 723.

Furthermore, to simplify assembly, an optional guiding step, prior to the steps previously described, of the main and secondary blades 721,

722, 723 can be considered. The pressure exerted from time to time by the free ends of the secondary blades 722, 723 against the outer surface of the wall of the main duct causes a slight elastic deformation of the secondary blades. Thus, the insertion and engagement steps can be carried out by a progressive folding of the air orientation device 700 towards the wall.

FIG. 8 illustrates, in an elevated perspective view, an example of an air directing device according to a third advantageous embodiment of the proposed technique.

This third embodiment differs from the first embodiment by the structure of the air orientation device 800, and mainly by the implementation of a guide portion 810 of planar shape which allows it to be pressed against the contour. inside a rectangular air discharge opening.

The assembly of an air orientation device 800 on a wall of a main air duct is carried out by an assembly method similar to that described in relation to the second embodiment.

Thus, similarly to the second embodiment, the wall of the main air duct also has a reversible change of shape between a first position, called coupling, and a second position, called immobilization. The same goes for the secondary (side) blades. FIG. 9 is a view in cross section of the removable fixing means, along the longitudinal axis thereof, of an example of an air orientation device according to a fourth advantageous embodiment of the proposed technique.

In this fourth embodiment, the air orientation device, made of a rigid material, has removable fixing means 920 comprising a main blade 921 and a secondary blade 921 substantially parallel to each other and extending at least partially. in a single fixing plane P. The main and secondary blades 921, 922 are arranged opposite one another, and spaced by an intermediate void Vi, so as to form an upper blade 921 and a lower blade 922.

The surfaces of the upper 921 and lower 922 blades located opposite the opposite blade respectively carry a plurality of projections 9210, 9220 oriented towards the opposite blade. The projections 9210, 9220 of the upper 921 and lower 922 blades are staggered and extend so as to be at least partially in a single plane P for fixing.

The plurality of protrusions 9210 of the upper blade 921 are configured to engage an exterior surface of the resiliently deformable flexible wall of a main air duct and the plurality of protrusions 9220 of the lower blade 922 are configured to be engaged with an interior surface of the wall of the same main air duct, and this after insertion of the lower blade 922 through an air discharge opening.

Such a structure makes it possible in particular to improve the mechanical strength of the removable fixing means, and therefore to minimize the risks of deterioration, or even destruction, thereof due, for example, to accidental clashes with users, for example. Such a structure also allows a homogeneous distribution of the friction force of the removable fixing means on a determined portion of the wall of a main air duct. This results in a limitation of the risk of the appearance of stress concentrations on the wall of an air duct, which could permanently degrade the structure of the latter, for example.

In the example illustrated, the upper and lower blades 921, 922 respectively carry five and three projections. It is obvious that a person skilled in the art will know how to adapt the number of projections in particular as a function of the dimensioning of the air discharge opening which has to cooperate with the air orientation device 900.

The assembly of the air orientation device 900 on a wall of a duct comprising at least one outlet opening for a secondary air flow comprises the following steps: insertion, from the outside of the duct of air, from the lower blade 922 through the exhaust opening; engaging the projections 9220 the lower blade 922 with an interior surface of the wall of the air duct and engaging the projections 9210 of the lower blade 921 with an interior surface of the flexible wall of the air duct; sliding of the blades 921, 922 along the wall of the air duct until the guide portion 910 abuts against an edge of the discharge opening.

In this fourth embodiment, the wall of the main air duct also has a reversible change of shape between a first position, called coupling, and a second position, called immobilization. The coupling position corresponds to a position in which the wall is not stressed and the upper and lower blades 921, 922 are in engagement with the exterior and interior surfaces respectively of the wall. The immobilized position corresponds to a position in which, after sliding of the removable fixing means 920, the wall is elastically deformed by the succession of bilateral pressures exerted by the projections 9210, 9220.

According to another solution, the lower and upper blades can be slightly convergent so as to locally produce, in addition to a frictional force, a pinching force on the wall of the air duct.

According to yet another solution, the lower and upper blades can be convergent and devoid of protrusions so as to produce a local force for immobilizing the air orientation device only by clamping on the wall of the main air duct.

FIGS. 10A and 10B illustrate, according to different views, an example of an air orientation device according to a fifth embodiment of the proposed technique. In this fifth embodiment, the air orientation device differs from the first embodiment in particular by the nature of the material forming the air orientation device.

More specifically, in this fifth embodiment, the air orientation device 1000 is made in one piece from a shape memory material having elastic properties. Preferably, the air orientation device 1000 is made, in whole or in part, in an elastomeric material, such as polyurethane for example.

Such an air orientation device 1000 comprises a guide portion 1010 of substantially annular shape including an area having a circular sector open or recessed along the longitudinal axis X of the guide portion 1010. In other words, the guide portion 1010 has a substantially "c" shaped cross section. According to another solution, the guide portion is devoid of such a recess so that the blades, described below, are circular and parallel.

Such a recess makes it possible, as will become clear below, to simplify the deformation of the guide portion 1010, by a pinching force exerted by the user, so as to simplify the assembly of the air orientation device. 1000 on the wall 11 of a main air duct.

The removable fixing means 1020 comprise a main blade 1021 and a secondary blade 1022 formed, one above the other, on the outer peripheral wall 1010P of the guide portion 1010 so as to form an upper blade 1021 and a lower blade 1022. Furthermore, the upper blade 1021 has a bevelled surface 1021A located opposite the lower blade 1022.

The bevelled surface 1021A of the upper blade 1021 is configured to engage at least with the outer edge of the air discharge opening formed in the rigid wall 11 of the main air duct. Preferably, the bevelled surface 1021A of the upper blade 1021 is configured to be pressed against the interior periphery of the discharge opening (not visible), that is to say the face of the opening connecting the interior and interior surfaces. outside 11, 11 _E of the wall 11 of the air duct. Thus, the removable fixing means 1020 substantially form a retaining groove configured to accommodate the wall 11 of the main air duct. The lower blade 1022 configured to engage with the interior surface 11i of the wall 11 of this same air duct.

Such a configuration allows the removable fixing means 1020 to exert a local immobilization force, of the removable fixing device 1020 on the wall 11 of the main air duct, by an elastic return of the device in an immobilized position or lock in the discharge opening.

The assembly of the air orientation device 1000 on the wall 11 of the main air duct comprising at least one discharge opening (not visible) of a secondary air flow comprises the following steps: compression of the guide portion 1010 and removable fixing means 1020 carried by the guide portion 1010, the compression being achieved by a pinching force exerted by the user on the guide portion 1010; inserting, from outside the duct, the lower blade 1022 through the discharge opening; and, relaxation of the guide portion 1010 and of the removable fixing means 1020 carried by the guide portion 1010, the relaxation being achieved by releasing the pinching force exerted by the user on the guide portion 1010.

Thus, the removable fixing means 1020 of the air orientation device 1000 have a reversible change of shape between a first position, called coupling, and a second position, called immobilization.

The coupling position corresponds to a position in which the air orientation device 1000, deformed under the effect of the compression exerted by the user, is partially disposed through the discharge opening.

The immobilized position corresponds to a position in which the removable fixing means 1020 exert, following the release of the pinching force exerted by the user, a pressure force on the contour of the discharge opening so to immobilize the air orientation device 1000.

FIGS. 11A and 11B illustrate, in different views, an example of an air orientation device according to a sixth embodiment of the proposed technique.

In this sixth embodiment, the air orientation device 1100 comprises a guide portion 1110 of tubular shape and of annular cross section. The guide portion 1110 has a diameter of equal value or substantially less than the value of the diameter of the discharge opening 12 to receive the air orientation device 1110.

The air orientation device 1100 further comprises removable fixing means 1120 formed by a blade extending helically on the outer peripheral wall 1110P of the guide portion 1110. The helical blade is intended to be engaged with the wall 11 of the main air duct in order to allow immobilization by friction, achieving the reversible fixing, of the air orientation device 1100 on the wall 11.

Such an air orientation device 1100 is configured to be fixed in a reversible manner to the wall 11 of a main air duct by a screwing force.

Furthermore, to simplify the insertion and fixing of the air orientation device 1100 on the wall 11, the air discharge opening 12 comprises a local _{extension 12 P.} Such an extension 12 _P , forming a notch, is configured to allow the passage of the removable fixing means, namely the helical blade 1120 in this embodiment.

The extension 12 _P of the air discharge opening 12, however, has dimensions smaller than the dimensions of the helical blade 1120. Thus, the insertion of the helical blade 1120 in the extension 12 _P causes an enlargement of the latter. , and therefore an elastic deformation of the wall 11 of the main air duct. The discharge opening 12 therefore has a capacity for reversible change of shape between a first position, called a coupling position, which is used for the transient phase of reversible connection and / or separation of the air orientation device with the 'discharge opening, and a second position, called immobilization, which is taken continuously when the air orientation device is secured to the discharge opening.

FIGS. 12A and 12B illustrate two examples of a reversible fixing air orientation device according to a seventh embodiment of the proposed technique.

In this seventh embodiment, the air orientation device 1200 is made in one piece from a rigid or shape memory material having elastic properties. More specifically, if the wall 11 (shown in broken lines for reasons of clarity) of the main air duct is made of a flexible material, an air orientation device made of a rigid material will be preferred. AT conversely, if the wall 11 of the main air duct is made of a rigid material, an air orientation device made of a shape memory material having elastic properties will be preferred. The main air duct and the air orientation device can obviously be made of such a shape memory material.

The air orientation device 1200 includes a guide portion 1210 of tubular shape and annular cross section.

Thus, the guide portion 1210 has an outer peripheral wall 1210P of outer diameter of predetermined value. The value of the outside diameter of the guide portion 1210 is determined so as to correspond substantially to the value of the diameter of the discharge opening (not visible), formed in the wall 11 of the main air duct, which must receive the air orientation device 1200. More precisely, if the air orientation device must be movable in rotation inside the discharge opening, the outside diameter of the guide portion 1210 will be slightly smaller to the inside diameter of the discharge opening. Conversely, if the air directing device is to be stationary in rotation within the discharge opening, the outer diameter of the guide portion 1210 will be equal to or slightly greater than the diameter of the discharge opening. In the latter case, the value of the external diameter of the guide portion 1210 is obviously determined so as to guarantee, via an elastic deformation as will appear subsequently, the connection and separation of the air orientation device.

The removable fixing means 1220 comprise a main blade 1221 and a secondary blade 1222 formed, one above the other, on the outer peripheral wall 1210P of the guide portion 1210 so as to form an upper blade 1221 and a lower blade 1222 located in two parallel planes (not shown). The upper 1221 and lower 1222 blades, and therefore the two parallel planes, are spaced from one another by a determined distance corresponding substantially to the thickness of the wall 11 of a main air duct. They thus form a space capable of accommodating the peripheral edge of the wall 11 at the level of the discharge opening 12.

More precisely, the upper blade 1221 extends fully around the periphery of the outer peripheral wall 1210P of the guide portion 1210 so as to form a continuous upper flange 1221. The bottom blade 1222, in turn, extends partially over the periphery of the outer peripheral wall 1210P 1210 guide portion so as to form a discontinuous lower flange 1222 having two free ends 1222a, 1222 _b. Such a discontinuity of the lower flange 1222 is due to the presence of a notch (or notch) 1223 passing through locally removing the extra thickness formed by the blade and thus exposing the outer peripheral wall 1210P of the guide portion 1210.

Each of the upper and lower flanges 1222 thus increase the outside diameter of the guide portion 1210 which is thus locally greater than the diameter of the discharge opening made in the wall 11 of the main air duct.

The notch 1223 ensures the assembly and disassembly of the air orientation device 1200, and this by allowing the progressive insertion and extraction of the lower flange 1222 through an evacuation opening air provided in the wall 11 of the main air duct.

More precisely, the assembly of the air orientation device 1200 on the wall 11 of the main air duct, comprising at least one outlet opening for a secondary air flow, comprises the following steps: insertion, from the outside of the duct, from a first of the two free ends 1222A, 1222 _B of the lower flange 1222 through the discharge opening. At the end of this insertion, a portion of the lower flange 1222, namely the first of the two free ends 1222A, 1222 _b , is located inside the main air duct and the upper flange 1221 partially rests on an outer surface 11 _E of the wall 11 of the main air duct, and rotation of the air orientation device 1200 until insertion of the second free ends 1222A, 1222 _B of the lower flange 1222 through the opening of evacuation, that is to say until complete insertion of the lower flange 1222 through the evacuation opening.

At the end of this rotation, which substantially produces the effect of a screwing although the flanges do not form a helical pitch, the upper flange 1221 is in engagement with the outer surface 11 _E of the wall 11 of the main air duct. and the lower flange 1222 engages an interior surface 11i of the wall 11 of the same main air duct. The wall 11 is then trapped between the upper 1221 and lower 1222 flanges.

Such a rotation is permitted via the reversible shape changing capabilities of the air orientation device 1200 and / or of the wall 11 of the main air duct (depending on the nature of the materials used). Indeed, the stresses exerted by the lower flange 1222 on the periphery of the discharge opening have the effect of causing a reversible elastic deformation of the wall 11 of the duct, and / or vice versa. This reversible elastic deformation is therefore used for the progressive insertion of the lower flange 1222 into the discharge opening. Then, when the lower flange 1222 has completely passed through the discharge opening to be placed inside the main air duct, the lower flange and / or the wall 11 of the main duct, no longer being constrained. 'one by the other, respectively resume their initial form. In other words, the discharge opening and / or the air orientation device therefore have a capacity for reversible change of shape between a first position, called a coupling position, which is used for the transient phase of joining. and / or reversible separation of the air orientation device with the discharge opening, and a second position, called immobilization, which is taken continuously when the air orientation device is secured to the discharge opening.

FIG. 12A illustrates a first illustrative example of this seventh embodiment of the proposed technique.

In this first illustrative example, the air orientation device 1200 is made of a rigid material, preferably a macromolecular plastic material, such as polyethylene terephthalate, advantageously exhibiting the following properties: high resistance to corrosion, to agents chemical, UV, sufficient flexibility to allow insertion through the wall and high mechanical strength. Any other plastic material exhibiting such properties, such as for example polypropylene, polyoxymethylene or a polyamide for example, can nevertheless be considered. More preferably, the air orientation device is made of a thermoplastic material, for manufacture thereof by injection into a mold or by printing, intrinsically having and / or by complementary treatment of such properties. The guide portion 1210 of the air orientation device 1200 extends along the longitudinal axis X. The guide portion 1210 thus has an outer peripheral wall 1210P of right annular cylindrical shape.

The upper and lower flanges 1221, 1222, located at a longitudinal end of the guide portion 1210, protrude radially from the outer peripheral wall 1210P, that is to say perpendicular to the longitudinal axis X.

In this first illustrative example, the two ends 1222A, 1222 _b , delimited by the notch 1123, are symmetrical to each other with respect to a median plane passing through the X axis and the middle of the notch 1223 Thus, the lower flange 1222 has two opposite symmetrical edges.

More precisely, the two ends 1222A, 1222 _b , converge towards one another in the direction of the outer peripheral wall 1210P of the guide portion 1210. The two ends 1222A, 1222 _b , are inclined and / or rounded.

Such symmetry makes it possible to simplify the mounting of the air orientation device on the wall of the main air duct by allowing the device to be rotated both clockwise and counterclockwise. It is the same for the disassembly of the air orientation device which can be carried out in the two aforementioned directions of rotation.

Further, the ends 1222A, 1222 _B are outwardly curved, i.e. convex, viewed from the interior of the guide portion 1210.

Such a shape of the ends of the lower flange makes it possible to avoid the formation of junction angles liable to degrade, for example tear, the flexible wall of the main duct during the rotation of the air orientation device. Similarly, if the main air duct is rigid, such a shape of the ends of the lower flange makes it possible to avoid, at least minimize, the degradation of the device. This therefore makes it possible to guarantee a long service life of the main air duct and / or of the air orientation device.

Fig. 12B illustrates a second example of this seventh embodiment of the proposed technique. As will become clear below, the second example (FIG. 12B) differs from the first example (FIG. 12A) only by the structure of the ends of the lower flange. The common elements will therefore not be repeated in the description of this second example and will be designated by the same references in FIGS. 12A and 12B.

In this second example, the lower flange 1222 ′ of the air orientation device 1200 ′ has two ends 1222 ′ _A , 1222 ′ _b , delimited by the notch 1223 ′. In addition, the ends 1222 ' _A , 1222' _B are asymmetrical with respect to one another with respect to a median plane P _M passing through the X axis and the middle of the notch 1223 '. Thus, the lower flange 1222 'has two opposite asymmetric edges.

More precisely, the two ends 1222 ′ _A , 1222 ′ _B converge towards one another in the direction of the outer peripheral wall 1210P of the guide portion 1210. One of the ends, in this case the end 1222 ' _B , stretches an angular portion about the X axis larger than the end 1222' _A. In other words, the lower flange has one end that converges towards the outer peripheral wall 1210P of the guide portion 1210 more strongly than the other end, that is to say that the end 1222 ' _{A is} the most convergent. is shorter than _{the less converging end 1222 'B,} which has a more gradual curvature.

Such an asymmetry of the lower flange allows _{the most converging end 1222 ′ A} , called the leading edge, to initiate the positioning of the air orientation device 1200 ′ on the wall of the main air duct. air while the less converging end 1222 ' _B , called the trailing edge, minimizes deformation of the wall of the main air duct before it returns to its original shape. The trailing edge also makes it possible to simplify the extraction of the air orientation device 1200 ′. Its implementation allows the installation and dismantling of the orientation device in a more gradual manner.

Preferably, and as illustrated, the ends 1222 ' _A , 1222' _B are curved outwardly when viewed from the interior of the guide portion 1210 ', that is to say convex. It can however be envisaged to have flat ends in order to have a uniform progressive deformation of the wall during assembly / disassembly of the device on the main air duct.

Alternative embodiments, to the illustrative examples described above, can also be made to the air orientation device while remaining in accordance with the seventh embodiment of the proposed technique. For example, if the main air duct is made of a rigid material, the air orientation device can be made of polyurethane, that is to say a shape memory material having elastic properties.

According to another example, the guide portion can be curved in order to adjust the orientation of the secondary air flow, coming from the air discharge opening of the main air duct, in a predetermined direction other than perpendicular. to the longitudinal axis of the main air duct. According to another example allowing adjustment of the orientation of the secondary air flow, the upper and lower flanges can be inclined relative to the longitudinal axis of the guide portion. Thus, when the air orientation device is assembled on the main air duct, the guide portion of the device is substantially inclined relative to the longitudinal axis of the duct. In another variant, the guide portion could be flexible to allow its orientation to be modified with respect to the surface of the wall 11 of the duct.

FIGS. 13A and 13B illustrate two examples of distribution of the secondary air discharge openings on the main air duct, which are alternative to the example illustrated in FIG. 3.

Analogously to the example illustrated in FIG. 3, the alternative examples illustrated in FIG. 13A and 13B respectively represent a duct and distribution assembly 200 ', 200 "comprising a main air duct 10, of tubular shape and of cross section. annular, having an axis of revolution A _R extending in a horizontal plane PH.

In addition, each secondary air discharge opening 12 is formed in the wall 11 of the main air duct 10 in at least one sector of angle a, between 0 ° and 45 °, preferably between 0 ° and 30 °, with respect to the horizontal plane PH.

In the example illustrated in FIG. 13A, the main air duct 10 has four angle sectors a with respect to the horizontal plane PH, namely a lower right sector, an upper right sector, a lower left sector and an upper sector. left.

The main air duct 10 further has four series of exhaust openings 12i ', 122', 123 ', 12 located respectively in the lower right sector, the upper right sector, the lower left sector and the upper left sector.

The example illustrated in FIG. 13B, differs from the example illustrated in FIG. 13A, by the implementation of two series of discharge openings 12i ", 122" located respectively in the upper right corner a sector and the upper left corner a sector.

FIG. 14 illustrates, according to a schematic representation seen from above, an air duct and distribution assembly according to an alternative embodiment.

This alternative embodiment differs from the embodiment, illustrated in relation to FIGS. 2 and 4 in particular, by an asymmetric distribution, with respect to the axis of revolution of the main air duct, of the orientation devices of air with reversible fixing on the secondary air discharge openings.

More specifically, in this alternative embodiment, the air duct and distribution assembly 200 '"comprises air orientation devices 100 attached to the secondary air discharge openings 12 of the main duct d. air 10 asymmetrically, with respect to a vertical plane passing through the axis of revolution A _R of the main air duct 10.

Such an asymmetrical distribution of the orientation devices 100 makes it possible to modulate differently the orientation of the secondary air flows on each side of the main air duct 10 depending on the structure of the building defining the closed or semi-closed interior volume and / or the needs of the bodies occupying this interior volume in particular.

In the example illustrated, the main air duct 10, which has a right side part 10 _D and a left side part 10G with respect to the vertical plane passing its axis of revolution A _R , is fictitiously separated into five longitudinal zones PCI ' , PC2 ', PC3', PC4 ', PC5' respectively succeeding each other.

In the right part 10 _D of the main air duct 10, only all or part of the discharge openings 12 of the first and second longitudinal zones PCI ', PC2' are equipped with orientation devices 100. In the left part 10 _G of this same main air duct 10, only all or part of the exhaust openings 12 of the first to fourth longitudinal zones PCI 'to PC4' of the duct are equipped with orientation devices 100.

Thus, an assembly of duct and air distribution 200 '"having such an asymmetrical distribution of the orientation devices 100 promotes the orientation and guidance of the secondary air flows in the left side part 10G of the main duct of air 10. According to another solution, in at least one longitudinal zone of the main tubular air duct, the secondary air discharge openings are formed on the main air duct asymmetrically with respect to a vertical plane passing through the axis of revolution of the main air duct. The asymmetry may in particular be due to different shapes and / or dimensions of the secondary air discharge openings. Such an asymmetry of the secondary air discharge openings makes it possible in particular to adapt the flow rate and / or the propagation of secondary air within a closed or semi-closed interior volume.

In view of the various embodiments described, it appears that the reversible change of shape between a first position, called coupling, and a second position, called immobilization, is achieved by the wall of the main air duct or by the removable fixing means. It can also be envisaged, in another solution, for the reversible change of shape to be carried out by the wall of the main air duct and by the removable fixing means, simultaneously or sequentially.

The installation of an assembly according to the technique proposed in a greenhouse for plant cultivation comprises, for example, and in this order of preference, the following steps: installation of a fan in a predetermined area of the greenhouse; connection of the fan to a first longitudinal end of a main duct, often also called duct, tubular, stepped or not, having openings, identical or not, uniformly or asymmetrically, distributed, longitudinally and radially, on its wall; connecting a cover to the opposite longitudinal end of the sheath; reversible fixing of removable air deflectors provided with removable fixing means such as blades (or "skis") on all or part of the openings of the sheath by carrying out, for each deflector,: the insertion, from the outside of the the sheath, of at least a first blade (or ski) through the opening; engaging the first ski (or blade) with an interior surface of the wall and engaging at least a second ski with an exterior surface of the wall; the sliding or pivoting of the skis until the air deflector is immobilized on the sheath.

Thus, each air deflector, configured to direct the associated air jet in a direction as perpendicular as possible to the axis of the duct in order to prevent this air mass from moving along the sheath by inducing an imbalance of temperature and humidity, is easily assembled and dismantled on / of the sheath. This results in a personalized design of the ducts according to the user's preferences, since the adjustable and modifiable nature of the positioning of the deflectors allows on the one hand a wider spectrum of initial configurations for the duct and its openings, and on the other hand. share more possibilities according to the evolution of the operating environment.

Obviously, the proposed technique is not limited to the embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants which a person skilled in the art may envisage in the context of the present invention and in particular any combination of the various operating modes described above, which may be taken separately or in combination.

For example, a person skilled in the art could have, in an air duct and distribution assembly according to the invention, sealing devices instead of certain air orientation devices. A closure device could for example be designed according to a design similar to that of an air orientation device, but replacing the guide portion by a closure portion, that is to say closure means. the air discharge opening made in the wall of a main air duct, and in which the closure device has been placed. In other words, such a closure device comprises on the one hand a closure portion configured to close said discharge opening, and on the other hand removable fixing means configured to reversibly fix the portion d. 'sealing at the wall of the main air duct. The removable fixing means of the air shutter device are advantageously identical or similar to the removable fixing means of the air orientation device of the proposed technique. More generally, the invention covers all the implementations of the principle according to which the air conditioning ducts of a greenhouse are equipped with removable air deflectors during their installation.

The solution of the proposed technique thus makes it possible, according to the embodiments, to have an air orientation device fixed in a reversible manner on a main air duct using removable fixing means so as to simplify handling, initial installation and subsequent modification of the installation.

According to various aspects, the proposed technique therefore has all or some of the following advantages, depending on the embodiments selected: allowing the fixing of the air orientation devices before or after installation of the main air duct in the interior volume closed or semi-closed; simply and efficiently fix the air orientation devices; adapt to standard or existing main air ducts; vary the orientation of the flows according to the structure of the main air duct; - optimize the main air duct assembly; guarantee a long service life; require limited maintenance; guarantee simplified maintenance; allow the fixing of air orientation devices without tools; etc.

Claims

1. Device for directing air (100), intended to be coupled to an air discharge opening formed in a wall of a main air duct, comprising a guide portion (110) configured to guide a secondary air flow issuing from said discharge opening, characterized in that it comprises removable fixing means (120) configured to reversibly fix said guide portion to said wall of the main air duct.

2. An air orientation device (100) according to claim 1, characterized in that said removable fixing means (120) are configured to exert a local force for immobilizing said device by friction on said wall of the main duct. 'air.

3. Device for directing air (100) according to any one of claims 1 and 2, characterized in that the discharge opening (12) and / or the removable fixing means (120) of the device d 'air orientation (100) have a capacity for reversible change of shape between a first position, called coupling, which is used for the transient phase of reversible joining and / or disconnecting of the air orientation device with a evacuation opening, and a second position, called immobilization, which is taken continuously when the air orientation device is secured to an evacuation opening.

4. An air orientation device (100) according to any one of claims 1 to

3, characterized in that said removable fixing means (920) are configured to exert a local force for immobilizing said device by clamping on said wall of the main air duct.

5. An air orientation device (100) according to any one of claims 2 to

4, characterized in that said removable attachment means (120) comprise at least one blade (121, 122, 123, 1120) intended to be engaged with said wall of the main air duct in order to produce said removable attachment by friction.

6. An air orientation device (100) according to claim 5, characterized in that said removable fixing means (120) comprise at least two, preferably three, blades (121, 122, 123) substantially parallel to each other and extending at least partially in a single fixing plane (P) so as to define a main blade (121) and at least one secondary blade (122, 123), said at least two blades being intended to be engaged in elastic connection with said wall of the main air duct to produce said frictionally removable attachment.

7. An air orientation device (100) according to claim 6, characterized in that said guide portion (110) extends along a longitudinal axis (X) and in that said main blade (121) and said secondary blades (122, 123) are integral with a longitudinal end of said guide portion (121).

8. An air orientation device (100) according to claim 6, characterized in that said guide portion (110) has a tubular shape, and in that said central blade (121) and said side blades (1212, 123) extend perpendicularly to the longitudinal axis (X) of said guide portion (110).

9. An air orientation device (100) according to any one of claims 2 to 8, characterized in that it comprises additional retaining means (130A, 130B), typically by stop or snap, configured to ensure the reversible fixing of said guide portion (110) on said wall (11) of the main air duct (10) in a complementary manner to said friction fixing.

10. An air orientation device (100) according to the preceding claim 9, characterized in that said additional retaining means (130A, 130B) are two projections extending on either side of said guide portion ( 110) so as to locally widen said guide portion (110).

11. An air orientation device (100) according to claims 6 and 9, characterized in that said secondary blades (122, 123) each carry one of said projections forming additional retaining means (130A, 130B).

12. Device for directing air (1200) according to any one of claims 1 to 3, characterized in that said guide portion (1210) has an outer peripheral wall (1210P) of tubular shape and in that said removable fixing means (1220) comprise two collars (1221, 1222) parallel to each other and integral with said outer peripheral wall (1210P) of said guide portion (1210) so as to define an upper collar (1221) spaced apart by a lower flange (1222, 1222 '), said lower flange (1222, 1222') having a notch (1223, 1223 ') intended for the passage of said wall of the main air duct between said upper and lower flanges (1221, 1222) .

13. Device according to claim 12 wherein said flanges are spaced from one another along the axis of said guide portion (1210) and define between them a space suitable for accommodating the peripheral edge of said wall 11.

14. Device according to claim 12 or 13 wherein said guide portion has an annular section.

15. Device according to any one of claims 12 to 14 wherein said lower flange is flush with one end of said guide portion.

16. An air orientation device (100) according to any one of claims 12 to 15, characterized in that it is made in one piece.

17. An air orientation device (100) according to any one of claims 12 to 16, characterized in that said lower flange (1222) has two free ends (1222A, 1222B), delimiting said notch (1223), and in that said ends (1222A, 1222B) are symmetrical with respect to a median plane passing through the axis of said guide portion located between said ends.

18. An air orientation device (100) according to any one of claims 12 to 17, characterized in that said lower flange (1222 ') has two free ends (1222' _A , 1222 ' _B ), delimited by said notch (1223 ¹ ), and in that said ends (1222'A, 1222 ' _b ) are asymmetrical with respect to a median plane (P _M ) passing through the axis of said guide portion located between said ends.

19. Device according to claims 17 or 18 wherein said ends (1222'A, 1222'B) converge towards one another in the direction of said outer peripheral wall (1210P) of the guide portion (1210).

20. An air orientation device (100) according to any one of claims 17 to 19, characterized in that said ends (1122A, 1122 _b, 1122'A, 1122 ' _b ) are of convex shape.

21. Air duct and distribution assembly (200) comprising:

- a main air duct (10), the wall (11) of which has a plurality of openings (12) for discharging secondary air therethrough; and

- at least one device for directing secondary air (100) coupled to one of said discharge openings (12), each device for directing air (100) comprising a guide portion (110) of a flow secondary air (FS) issuing from said discharge opening (12) associated with said air orientation device (100) and removable fixing means (120) of said guide portion (110) to said wall ( 11) of the air duct (10).

22. Air duct and distribution assembly according to claim 21, characterized in that said removable fixing means (120) comprise at least two, preferably three, blades (121, 122, 123) substantially parallel to each other and s 'extending at least partially in a single fixing plane (P), so as to define a main blade (121) and at least one secondary blade (122, 123), and in that said main blade is in elastic connection with a outer surface (11 _E ) of said wall (11) of the main air duct (10) and said at least one secondary blade (122, 123) is in elastic connection with an inner surface (11) of said wall (11) of the air duct (10).

23. An air duct and distribution assembly according to any one of claims 21 to 22, characterized in that said plurality of exhaust openings (12) is distributed along said main air duct (10). having a predetermined length (Lio), and in that each discharge opening (12) located in a first longitudinal zone (PCI) of said main air duct (10) carries an air orientation device (100).

24. Assembly of duct and air distribution according to claim 23, characterized in that said first longitudinal zone (PCI) has a length (Lio) between a fifth and half of the length (Lio) of said main duct d. air (10), and in that said first longitudinal zone (PCI) is located at a longitudinal end (10A) of the main air duct (10), said longitudinal end (10A) of the main air duct (10) ) being intended to be coupled to a central air conditioning unit (20).

25. Air duct and distribution assembly according to claim 23, characterized in that said main air duct (10) comprises a second longitudinal zone (PC2), distinct from said first longitudinal zone (PCI), in which certain exhaust openings (12) respectively carry an air orientation device (100), and a third longitudinal zone (PC3), distinct from said first and second longitudinal zones (PCI; PC2), in which the openings of exhaust (12) are devoid of air orientation device.

26. An air duct of the type for use in a duct and distribution assembly according to any one of claims 21 to 25.