FR3057339A1 - DEVICE FOR FIXING THE END OF A FLEXIBLE VENTILATION SLEEVE - Google Patents

Abstract

The invention relates to a device (1) for fixing a flexible ventilation duct (2) comprising a tubular member (1A), one end of which is capable of being connected to the end of the sheath by fitting thereof. According to the invention, this fixing device also comprises a longitudinally flexible extension portion (1B) connected to said end of said tubular member (1A) and adapted to be disposed inside the sheath and to accompany the curvature.

Description

057 339

59780 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:

(to be used only for reproduction orders) (© National registration number

COURBEVOIE © Int Cl ⁸ : F24 F13 / 06 (2017.01)

PATENT INVENTION APPLICATION

A1

®) Date of filing: 11.10.16. © Applicant (s): ATLANTIC CLIMATISATION & VENTI- (30) Priority: LATION Simplified joint-stock company - FR. @ Inventor (s): DEMIA LAURENT, AUCOUTURIER VINCENT and GAUDILLOT AXEL. (43) Date of public availability of the request: 13.04.18 Bulletin 18/15. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): ATLANTIC CLIMATISATION & VENTI- related: LATION Simplified joint-stock company. ©) Extension request (s): (© Agent (s): IPSILON Simplified joint-stock company.

(□ 4 / DEVICE FOR FIXING THE END OF A FLEXIBLE VENTILATION DUCT.

FR 3 057 339 - A1 _ The invention relates to a device (1) for fixing a flexible ventilation duct (2) comprising a tubular member (1 A), one end of which is capable of being connected to the end of the sheath by fitting the latter.

According to the invention, this fixing device also comprises a longitudinally flexible extension part (1 B) connected to said end of said tubular member (1 A) and capable of being disposed inside the sheath and accompanying its curvature .

S 1B

DEVICE FOR FIXING THE END OF A FLEXIBLE VENTI LATI ON SHEATH

The invention relates to a device for fixing one end of a flexible ventilation duct.

Such a fixing device can be used in the case of a stitching for fixing a flexible sheath to a ventilation unit. The ventilation units, whether of the single-flow or double-flow type, as well as many other ventilation equipment, have connections required to allow the connection of these ventilation units or ventilation equipment to the duct networks of the building to treat.

The tappings are generally tubular, of circular section. To facilitate insertion into the flexible sheath, conical tapping is known.

Furthermore, the flexible sheaths to be connected to these nozzles are generally armed with a helical wire, in particular steel or plastic, to give them a circular shape. This wire makes it difficult to connect the sheath to the nozzle.

Patent document FR 2 995 066 proposes a nozzle for fixing a flexible sheath on a ventilation unit having a thread on its external surface, with the aim of allowing both easy insertion of the sheath on the nozzle and of '' prevent spontaneous disconnection.

Such a fixing device can also be used in the case of a ventilation opening provided with a sleeve for fixing a flexible sheath.

The ventilation openings generally have sleeves necessary to allow the connection of these ventilation openings with ventilation units or other ventilation equipment of the building to be treated through ducts.

The cuffs are generally end pieces of tubular shape and of circular section. To facilitate their insertion into a flexible sheath, it is known to use conical cuffs, for aid in insertion.

Because of the geometry with symmetry of revolution of the cuffs, the fixing of the flexible sheath on the cuff, and therefore its sealing, cannot be ensured, which creates a malfunction in the corresponding ventilation installation.

To correct this defect, it is known to form a groove on the cuff which allows the sheath to be tightened on the cuff, their sealing being effected by adding adhesive tape or a collar.

In the case of a fastening device consisting of a fastening nozzle or a cuff, this fastening device therefore generally consists of a tubular member on which is joined by fitting the end of the sheath.

However, as illustrated in FIG. 1, which shows a fastening connection 1 as described in patent document FR 2 995 066, on which the end of a sheath 2 is fitted, it turns out that in the case of a very curved steering, the sheath 2 can collapse downstream of its end supported by the fixing device 1. The air passage section is then reduced and this results in high pressure losses.

It is known to use rigid elbows which are connected to the end of the sheath, but the use of such elbows presupposes knowledge of the angular direction of the sheath and constitute independent parts to be managed.

Sleeves of reduced length are also known, if they limit the problem of sagging of the sheath, mentioned above, they cause an insecure connection of the sheath by fitting.

The invention solves these problems and proposes a device for fixing a flexible ventilation duct which is easy and efficient to manufacture and use, and which can in particular be used to constitute a fixing tap or a mouth cuff of ventilation of a ventilation system.

To do this, the invention provides a device for fixing a flexible ventilation duct comprising a tubular member, one end of which is capable of being connected to the end of the duct by fitting the latter, characterized in that it also comprises a flexible extension portion longitudinally connected to said end of said tubular member and capable of being disposed inside the sheath and accompanying its curvature.

Thanks to this extension part, it is avoided that the sheath collapses on itself when it is caused to change direction near its fitting on the tubular member.

According to a first embodiment, said extension part consists of at least one helical blade of diameter substantially identical to the diameter of said tubular member.

Said extension part may consist of two said blades in the form of a double helix.

Preferably, the flexible ventilation sheath being armed with a helical wire, the pitch of said helix is reversed with respect to the pitch of said helical wire of the sheath.

Thanks to this characteristic, the section of the extension part has its section which decreases during its insertion in the sheath and which increases during a possible extraction by unscrewing. This facilitates the engagement of the tubular member in the sheath.

Advantageously, said extension part comprises a ring at its free end, this ring being substantially perpendicular to the longitudinal axis of said propeller and the (s) said blade (s) being connected (s) to said ring by their end. .

According to a second embodiment, said extension part consists of at least one longitudinal blade.

And advantageously, said extension part consists of several longitudinal blades regularly distributed over said end of said cylindrical member.

According to a third embodiment, said extension part consists of a plurality of facing rings, two adjacent rings being connected by at least one section of blade.

Preferably, the flexible ventilation sheath being armed with a helical wire, said tubular member carries a helical thread on all or part of its external face.

And said extension part advantageously carries a helical thread on all or part of its external face extending said thread of the tubular member.

And preferably, the pitch of said thread is identical to that of the helical wire of the sheath.

Said tubular member can be conical.

Preferably, the fixing device is made of plastic.

And advantageously, it consists of two plastics of different stiffness.

The invention relates to a nozzle for fixing a flexible ventilation duct to a ventilation unit made up of such a device.

This connection can be structurally part of a ventilation group or be a separate accessory, for example to clip on a ventilation group.

The invention also relates to a ventilation opening provided with a sleeve for fixing a flexible sheath, said sleeve being made up of such a device.

Finally, the invention relates to a ventilation installation provided with a fan and a network of ducts, comprising at least one such tap or such a mouth, in air communication with said network and said fan.

The invention is described below in more detail with the aid of figures representing only preferred embodiments of the invention.

Figure 1 is a front view illustrating the prior art which is specified above.

Figure 2 is a schematic front view illustrating a tap according to the invention with a fixed ventilation duct.

Figures 3 to 7 are front views of different embodiments of a device according to the invention.

As shown diagrammatically in FIG. 2, according to the invention, the device 1 for fixing a flexible ventilation duct 2, which therefore comprises a tubular member 1A which can be conical and one end of which is capable of being connected to the end of the sheath by fitting the latter, also comprises a longitudinally flexible extension part 1B connected to the end of the tubular member 1A and able to be placed inside the sheath 2 and to accompany the curvature thereof. Due to its mechanical strength, this flexible extension part 1B maintains the sheath on its curved part and ensures its interior section which is substantially constant, which reduces the aeraulic effect of the curvature of the sheath and therefore limits the associated pressure losses of the flow. ventilation air.

Such a device is intended to constitute a nozzle or a ventilation outlet fitted to a ventilation installation provided with a fan and with a network of ducts in air communication with said network and said fan.

A flexible ventilation duct may be a canvas duct, typically PVC or aluminum, reinforced for example with a helical wire of steel or rigid plastic or a circular duct made of a flexible material such as extruded polyethylene or foam, for example. The flexible sheath can be thermally insulated.

According to a first embodiment, shown in FIG. 3, said extension part 1B consists of a blade 1C in the form of a helix with a diameter substantially identical to the diameter of the tubular member 1A.

In this figure, this tubular member 1A is also a fixing stitching element as described in patent document FR 2 995 066 having clips 10 allowing it to be hooked to the ventilation unit.

The flexible ventilation duct 2 being armed with a helical wire, the pitch of the propeller is preferably reversed with respect to the pitch of the helical wire of the duct 2.

According to a second embodiment shown in the figure

4, said extension part 1B consists of two blades 1’C, 1 ”C in the form of a double helix. This extension part has a 1D ring at its free end, this ring being substantially perpendicular to the longitudinal axis of the double helix and the latter being connected to the ring by its end.

In this figure, the tubular member 1A is also a fixing stitching element as described in patent document FR 2 995 066.

According to a third embodiment shown in the figure

5, the extension part consists of longitudinal blades 1 E,

1F, 1G regularly distributed over the end of the cylindrical member 1A.

In this figure, this tubular member 1A is a ventilation mouth cuff equipped with a helical thread 1J. The term “net” is intended to mean a helical structure deployed continuously or else discontinuously over a part of the outer circumferential surface of the cuff, optionally on a frustoconical portion, and intended to allow the cuff to be assembled with the sheath.

According to a fourth embodiment shown in the figure

6, the extension part consists of a plurality of rings 1H arranged parallel to each other in facing relation and substantially perpendicular to the longitudinal axis of this extension part, two adjacent rings being connected by two sections blade 11 diametrically opposed.

In this figure, the tubular member 1A is also a ventilation mouth cuff. This cuff comprises a thread 1J here produced on a frustoconical portion 3A of the cuff 1A.

The cuff also comprises a support flange 4A and fixing fins 5A for fixing and wedging the cuff against its support, namely a wall of a room such as a wall or a ceiling. The support flange 4A on the one hand stops the introduction of the cuff into the wall and on the other hand allows the cuff to rest against the body of the ventilation opening. The fixing fins 5A are preferably flexible so that they can be folded up when the cuff is introduced into the wall. The redeployment of the fin in the cavity or behind the wall then makes it possible to block the withdrawal of the cuff from the wall.

According to a fifth embodiment shown in the figure

7, the extension part consists of a plurality of rings

ΓΗ arranged parallel to each other in facing relation and substantially perpendicular to the longitudinal axis of this extension part, two adjacent rings being connected by a single section of blade ΓΙ.

In this figure, this tubular member 1A is also a ventilation mouth cuff equipped with a helical thread 1J.

When the tubular member 1A carries a helical thread 1J on all or part of its external face as previously described, the extension part 1B advantageously carries a helical thread 1K on all or part of its external face extending the thread 1J of the member tubular, as shown in Figures 3 and 4.

And preferably, the pitch of the threads 1J and 1 K is identical to that of the helical thread of the sheath, which can be of the order of 1 to 30 millimeters.

The fixing device 1 is made of plastic, for example polystyrene, polypropylene or polyethylene. This material can also be a thermoplastic elastomer and this thermoplastic elastomer is preferably chosen from styrene butadiene styrene (SBS), styrene ethylene butadiene styrene (SEBS), a polyolefin such as a low density polyethylene and one of their mixtures.

Such a thermoplastic elastomer is injectable and at low cost, which is advantageous for the manufacture of the cuff or the stitching.

Advantageously, the fixing device can be made of two plastics of different stiffness, the stiffness of the plastics constituting the extension part 1B being less than that of the plastics constituting the tubular member 1A. The tubular member 1A can be made of polystyrene while the extension part 1B can be made of styrene butadiene styrene (SBS). The fixing device is then produced by bi-material injection or by overmolding.

The shape and dimensions of the fixing device 1 depends of course on the shape and dimensions of the sheath to be fixed.

It can be of circular or oblong section, if the sheath is of circular or oblong section.

For example, its diameter is 80, 125 or 160 millimeters depending on a range of sheath diameters. The length of the extension part 1B can be between 50 and 150 millimeters.

What is described above with reference to a cuff can also be applied to a stitching and vice versa.

Other forms of the extension part allowing to accompany the curvature of the sheath, by combining the different described or different forms but in the same principle creating flexibility are within the scope of the invention.

In addition, the 1 K, 1J threads, whether on the tubular member or on the extension part, can be of variable sections over their length and their pitch can also be variable to promote insertion or wedging.

Claims (17)

1. Fixing device (1) of a flexible ventilation duct (2) comprising a tubular member (IA), one end of which is capable of being connected to the end of the duct by fitting the latter, characterized in that 'It also includes a longitudinally flexible extension part (IB) connected to said end of said tubular member (IA) and capable of being disposed inside the sheath and accompanying its curvature. 2. Device according to claim 1, characterized in that said extension part (IB) consists of at least one blade (IC, l'C) in the form of a helix with a diameter substantially identical to the diameter of said tubular member (IA ). 3. Device according to claim 2, characterized in that said extension part consists of two said blades (l'C) in the form of a double helix. 4. Fastening device according to claim 2 or 3, characterized in that, said flexible ventilation sheath being armed with a helical wire, the pitch of said helix is reversed relative to the pitch of said helical wire of the sheath (2) . 5. Device according to one of claims 2 to 4, characterized in that said extension part (IB) comprises a ring (1D) at its free end, this ring being substantially perpendicular to the longitudinal axis of said propeller and the (es) said (s) blade (s) being connected (s) to said ring by their end. 6. Device according to claim 1, characterized in that said extension part (IB) consists of at least one longitudinal blade (1E, 1F, IG). he 7. Device according to the preceding claim, characterized in that said extension part (IB) consists of several longitudinal blades (1E, 1F, IG) regularly distributed over said end of said cylindrical member. 8. Device according to claim 1, characterized in that said extension part (IB) consists of a plurality of rings (1H, 1Ή) facing each other, two adjacent rings being connected by at least one section blade (II, 1Ί). 9. Device according to one of the preceding claims, characterized in that, said flexible ventilation sheath being armed with a helical wire, said tubular member (IA) carries a helical thread (IJ) on all or part of its external face . 10. Device according to the preceding claim, characterized in that said extension part (IB) carries a helical thread (1K) on all or part of its external face extending said thread (IJ) of the tubular member. 11. Fastening device according to claim 9 or 10, characterized in that the pitch of said thread (1K) of the extension part is identical to that of the helical wire of the sheath (2). 12. Device according to one of the preceding claims, characterized in that said tubular member (IA) is conical. 13. Device according to one of the preceding claims, characterized in that it is made of plastic. 14. Device according to the preceding claim, characterized in that it consists of two plastics of different stiffness. 15. Attachment connection for a flexible ventilation duct on a ventilation unit consisting of a device according to one of the preceding claims. 16. Ventilation opening provided with a sleeve for fixing a flexible sheath, said sleeve consisting of a device according to one of claims 1 to 14. 17. A ventilation installation provided with a fan and a network of ducts, comprising at least one nozzle or a mouth according to claim 15 or 16, in air communication with said network and said fan. 1/2 ÜWUzzfllD