Glazing with improved sound insulation and moisture absorption performance

Abstract

Glazing with improved sound insulation and moisture absorption performance. The invention relates to glazing comprising at least two glazed panes (7, 17, 27) forming a cavity between them. The cavity comprises at least one device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a chamber (2, 12) disposed within the cavity, the device further comprising desiccant means configured to absorb moisture present in said at least one chamber. Figure for the abstract: Fig. 6

Description

Title of the invention: Glazing with improved acoustic insulation and moisture absorption performance Prior art

[0001] The present invention belongs to the general field of glazing manufacturing. It relates more particularly to a device configured to improve the acoustic insulation performance of a glazing unit as well as to limit the presence of humidity between glazed walls of said glazing unit. It also relates to a glazing unit comprising at least one such device. The invention finds a particularly advantageous, although in no way limiting, application in the case of building glazing.

[0002] Double glazing consisting of two panes separated by a cavity filled with gas, typically air, is conventionally used in windows and building facades for its thermal and acoustic insulation performance.

[0003] However, the loss of sound transmission caused by such double glazing decreases for frequencies surrounding the so-called "mass / spring / mass" frequency corresponding to the resonance frequency of the double glazing and located in the low frequencies. This phenomenon, called the mass / spring / mass effect, is due to significant variations in pressure in the air cavity at the mass / spring / mass frequency.

[0004] Also, in order to improve the acoustic insulation performance of glazing, different solutions have been developed. For example, document US 2010 / 0300800 describes acoustic glazing, in particular aircraft cockpit glazing, comprising a first glass plate separated from a second intermediate glass plate by a layer of acoustic PVB (polyvinyl butyral), the second glass plate being separated from a third glass plate by a layer of standard PVB or polyurethane.

[0005] However, this solution does not improve sound insulation at low frequencies. To improve sound insulation at low frequencies, an existing passive solution is to increase the thickness of the glass plates or the thickness of the glazing cavity. However, this leads to bulky, very heavy structures with an unfavorable on-board carbon footprint.

[0006] Beyond the acoustic improvement of glazing while respecting space and weight constraints, the solutions envisaged are also subject to problems of managing the presence of humidity between the panes forming a glazing. More particularly, it is a question of being able to absorb the residual water vapor in the cavity between the panes during the manufacture of the glazing, and during its use. lization.

[0007] There is therefore a real need to provide a system making it possible to improve the acoustic insulation properties of glazing, particularly in the low frequencies, as well as the latter's performance in terms of moisture absorption, while allowing this glazing to be relatively light and compact. Statement of the invention

[0008] The present invention aims to remedy all or part of the drawbacks of the prior art, in particular those set out above, by proposing a solution which makes it possible to obtain glazing which is much more effective than those of the solutions of the prior art in terms of acoustic insulation but also of moisture absorption between the glazed walls of said glazing.

[0009] Thus, and according to a first aspect, the invention relates to a glazing comprising at least two glazed walls forming a cavity between them. The cavity comprises at least one device comprising at least one plate, said plate comprising a plurality of perforations arranged periodically and delimiting a chamber arranged in the cavity, the device further comprising desiccant means configured to absorb moisture present in said at least one chamber.

[0010] In particular embodiments, the glazing may further comprise one or more of the following characteristics, taken individually or in all technically possible combinations.

[0011] In particular embodiments, the desiccant means comprise desiccant means arranged inside said at least one chamber, called “internal desiccant means”.

[0012] In particular embodiments, a porous absorbent material is present within said at least one chamber, preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, said fixedly arranged internal desiccant means comprising granules integrated into said porous absorbent material and / or a bar arranged in a cavity of said porous absorbent material.

[0013] In particular embodiments, the internal desiccant means comprise granules gathered in at least one envelope.

[0014] In particular embodiments, at least one envelope is held in a fixed position by contact with an internal wall of said at least one chamber and a porous absorbent material present inside said at least one chamber, preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0015] In particular embodiments, said at least one envelope comprises: - two envelopes respectively arranged at opposite ends of said at least one chamber, or - three envelopes, including two envelopes respectively arranged at opposite ends of said at least one chamber as well as one envelope arranged substantially centrally between said two envelopes arranged at the ends.

[0016] In particular embodiments, the internal desiccant means comprise at least one plate made of a solid material, called an “absorbent” plate.

[0017] In particular embodiments, said internal desiccant means comprise a stack of a first layer and a second layer, called an "absorbent stack", said two layers being preferably parallel to the perforated plate, the first layer being a so-called absorbent plate and the second layer being a porous absorbent material present inside said at least one chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0018] In particular embodiments, the internal desiccant means comprise a plurality of absorbent stacks.

[0019] In particular embodiments, all or part of the internal desiccant means are maintained in a fixed position in said at least one chamber.

[0020] In particular embodiments, the desiccant means comprise desiccant means arranged fixedly outside said at least one chamber, called “external desiccant means”, in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

[0021] In embodiments, the device plate comprises at least three perforations, preferably at least four perforations.

[0022] In embodiments, the perforations have a maximum diameter or dimension of 0.2 mm to 8 mm, preferably 0.5 mm to 8 mm.

[0023] In embodiments, the centers of the perforations are spaced apart by a distance of 5 mm to 200 mm, preferably 10 mm to 110 mm.

[0024] In embodiments, the thickness of the plate is from 0.1 mm to 15 mm, preferably from 0.2 mm to 1 mm.

[0025] In embodiments, the plate and the chamber are configured to resonate at a low frequency.

[0026] In embodiments, the plate is made of metallic material, preferably aluminum and / or stainless steel, and / or polymeric material, preferably polyethylene, polycarbonate, polypropylene, polystyrene, polybutadiene, polyisobutylene, polyester, polyurethane, polymethyl methacrylate, polyacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile, butadiene styrene, acrylonitrile styrene acrylate, styrene-acrylonitrile copolymer, or a combination thereof, the polymer material optionally being reinforced with glass fibers.

[0027] In embodiments, the glazing comprises at least two plates, preferably at least three plates, each comprising a plurality of perforations arranged periodically and delimiting a chamber arranged in the cavity, preferably the periodicities of the perforations of at least two of the plates, more preferably of at least three plates, are different from each other.

[0028] In embodiments, at least one plate of the device comprising a plurality of periodically arranged perforations and the chamber it delimits are configured to resonate at the mass / spring / mass frequency of the glazing.

[0029] In embodiments, the device further comprises: - at least one second plate comprising a plurality of perforations arranged periodically and delimiting a second chamber arranged in the cavity, said second plate and chamber being configured to resonate at the third octave frequency lower than the mass / spring / mass frequency of the glazing; and - at least one third plate comprising a plurality of perforations arranged periodically and delimiting a third chamber arranged in the cavity, said third plate and chamber being configured to resonate at the third octave frequency higher than the mass / spring / mass frequency of the glazing.

[0030] In embodiments, the device is a spacer device attached to each of the two glass walls and comprises at least one rectilinear tubular profile comprising at least one upper wall, one lower wall and two side walls defining the chamber, wherein the upper wall constitutes the plate comprising a plurality of perforations arranged periodically.

[0031] In embodiments, the chamber of the profile has a thickness, between the upper wall and the lower wall of the profile, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0032] In embodiments, the device is a spacer device attached to each of the two glass walls and comprises at least one rectilinear bar, wherein the bar constitutes the plate comprising a plurality of perforations arranged periodically, said bar defining the chamber with the two glass walls, said chamber extending between the two glass walls, from the bar to an edge of the glazing.

[0033] In embodiments, the chamber has a thickness, between the bar and the edge of the glazing, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0034] In embodiments, the device comprises a rectilinear box comprising at least one upper wall, one lower wall, two longitudinal side walls and two transverse side walls defining the chamber, in which the upper wall or one of the longitudinal side walls constitutes the plate comprising a plurality of perforations arranged periodically, the width of said box being less than the thickness of the cavity between the two glazed walls in the same direction and, preferably, the length of said box being less than the length of the cavity in the same direction.

[0035] In embodiments, the chamber of the box has a thickness, between the wall of the box comprising the periodically arranged perforations and the wall opposite it, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0036] In embodiments, a porous absorbent material is present within the chamber, preferably selected from the group consisting of mineral wools, textile fibers, polymeric foams, and combinations thereof.

[0037] In embodiments, the device is positioned in a peripheral area of ​​the glazing cavity.

[0038] In embodiments, the glazing is building glazing, such as building facade, window or door glazing or interior glazing.

[0039] The invention also relates to a spacer device for glazing comprising at least one rectilinear tubular profile comprising at least one upper wall, one lower wall and two side walls defining a chamber, in which the upper wall comprises a plurality of perforations arranged periodically, desiccant means configured to absorb moisture being present in said chamber.

[0040] The invention also relates to a spacer device for glazing comprising at least one rectilinear bar comprising a plurality of perforations arranged periodically and defining a chamber, desiccant means configured to absorb moisture being present in said chamber.

[0041] The invention also relates to a glazing device comprising at least one rectilinear box comprising at least one upper wall, one lower wall, two longitudinal side walls and two transverse side walls defining a chamber, in which the upper wall or one of the longitudinal side walls comprises a plurality of perforations arranged periodically, desiccant means configured to absorb moisture being present in said chamber.

[0042] The present invention makes it possible to meet the need expressed above. More particularly, it provides a glazing device making it possible to obtain glazing having improved acoustic insulation, in particular in the low and medium frequencies, but also in the high frequencies, while being able to be relatively light and compact.

[0043] This is achieved by the presence, in the device, of a plate on which a plurality of perforations are periodically arranged, said plate allowing the formation of a chamber. The combination of the presence of said chamber with the presence of perforations on the plate, these perforations being periodic, allows the creation of resonators making it possible to absorb at least part of the sound energy in the cavity of the glazing formed by the two glazed walls, which makes it possible to reduce the transmission of sound through the glazing. In particular, the resonators absorb the sound energy significantly for frequencies close to their resonance frequency(ies).In addition, the absorption of energy also for the harmonic frequencies of the resonators as well as physical phenomena related to the modification of the properties of the gas cavity of the glazing, due to the presence of the resonators, make it possible to also improve the acoustic insulation at frequencies higher than the resonant frequencies of the resonators.

[0044] Furthermore, the present invention also makes it possible to meet the need for moisture absorption between glazed walls of said glazing. This is accomplished by means of the desiccant means used to absorb moisture in a chamber defined by means of the perforated plate.

[0045] It should be noted that the various components forming the device according to the invention may be opaque or transparent or semi-transparent. This makes it possible to improve the visual appearance of the glazing according to the invention. Brief description of the drawings

[0046] Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the appended drawings which illustrate an exemplary embodiment thereof without any limiting character. In the figures:

[0047] [Fig.l] [Fig.l] represents on its left part an example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the profile of an example of device according to the invention present in this example of glazing;

[0048] [Fig.2] [Fig.2] represents on its left part another example of glazing according to the invention and, on its right-hand side, an enlarged and perspective schematic view of the box of an example of a device according to the invention present in this example of glazing;

[0049] [Fig.3] [Fig.3] represents on its left part another example of glazing according to the invention and, on its right-hand side, an enlarged and perspective schematic view of the bar of an example of a device according to the invention present in this example of glazing;

[0050] [Fig.4] [Fig.4] schematically represents yet another particular mode of production of a glazed assembly according to the invention;

[0051] [Fig.5] [Fig.5] represents in the form of a flowchart the main stages of a method of manufacturing a glazed assembly according to the invention;

[0052] [Fig.6] [Fig.6] schematically represents, in a longitudinal sectional view tudinal, a particular embodiment of the device of [Fig.l];

[0053] [Fig.7] [Fig.7] schematically represents, in a longitudinal sectional view tudinale, another particular embodiment of the device of [Fig.l];

[0054] [Fig.8] [Fig.8] schematically represents, in a longitudinal sectional view, another particular embodiment of the device of [Fig.1];

[0055] [Fig.9] [Fig.9] schematically represents, in a longitudinal sectional view tudinale, another particular embodiment of the device of [Fig.l];

[0056] [Fig. 10] [Fig. 10] schematically represents, in a longitudinal sectional view, another particular embodiment of the device of [Fig.l];

[0057] [Fig. 11] [Fig. 11] schematically represents, in a longitudinal sectional view, another particular embodiment of the device of [Fig.l];

[0058] [Fig. 12] [Fig. 12] schematically represents, in a longitudinal sectional view, another particular embodiment of the device of [Fig.l].

[0059] Description of embodiments

[0060] The invention is now described in more detail and in a non-limiting manner in the following description.

[0061] The invention relates firstly to a device for glazing.

[0062] The remainder of the description aims firstly to set out, according to embodiments, aspects of configuration of said device allowing the glazing equipped therewith to provide excellent performance in terms of acoustic insulation.

[0063] The configuration aspects of the device allowing the glazing equipped with it to significantly limit the presence of humidity between the glazed walls of the glazing are described later.

[0064] The glazing may be any type of glazing comprising at least two glazed walls defining a cavity between them. For the purposes of the present invention, the cavity of a glazing is defined as being the volume between two glazed walls of said glazing.

[0065] The device according to the invention may be a spacing device for glazing. By "spacing device" is meant any device making it possible to fix the length of the spacing between the glazed walls of the glazing in which it is intended to be placed.

[0066] Alternatively, the device according to the invention may not be used as a spacing device.

[0067] The device according to the invention comprises at least one plate comprising a plurality of perforations arranged periodically (also called “perforated plate” hereinafter).

[0068] Preferably, the plate of the device comprises, or is made of, a metallic material, such as aluminum and / or stainless steel, and / or a polymeric material, such as polyethylene, polycarbonate, polypropylene, polystyrene, polybutadiene, polyisobutylene, polyester, polyurethane, polymethyl methacrylate, polyacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile, butadiene styrene, acrylonitrile styrene acrylate, a styrene-acrylonitrile copolymer, or a combination thereof, optionally reinforced with glass fibers.

[0069] The plate comprises two main faces opposite each other and bearing the perforations, called in the present text "external face" (corresponding to the face intended to be closest to the edge of the glazed walls of the glazing) and "internal face" (corresponding to the face intended to face the center of the cavity formed between the glazed walls of the glazing).

[0070] For the perforated plate, a length can be defined, corresponding to the largest dimension of the plate in the plane of its main faces (also called the “main plane of the plate”), a width, corresponding to the dimension of the plate in a direction perpendicular to the direction of the length of the plate, in the main plane of the plate, and a thickness, corresponding to the dimension of the plate in a direction perpendicular to the main plane of the plate (and therefore corresponding to the dimension of the plate between its two main faces).

[0071] The perforated plate is preferably rectangular parallelepiped (i.e. it has a constant length, width and thickness).

[0072] When the device according to the invention is a spacer device, the width of the perforated plate preferably determines the length of the spacing between the glass walls (i.e. the thickness of the cavity between the glass walls) of the glazing in which the spacer device is intended to be used. The width of the plate may be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm or 20 mm, in particular in embodiments in which the device is a spacer device.

[0073] The thickness of the perforated plate is advantageously from 0.1 to 15 mm, more preferably from 0.2 to 1 mm. In particular, the perforated plate may have a thickness of 0.1 to 0.2 mm, or from 0.2 to 0.4 mm, or from 0.4 to 0.6 mm, or from 0.6 to 0.8 mm, or from 0.8 to 1 mm, or from 1 to 1.2 mm, or from 1.2 to 1.5 mm, or from 1.5 to 2 mm, or from 2 to 3 mm, or from 3 to 4 mm, or from 4 to 5 mm, or from 5 to 10 mm, or from 10 to 15 mm.

[0074] The plate comprises a plurality of perforations arranged periodically. By "plurality of perforations" is meant at least two perforations. More particularly, the plate may comprise two, or three, or at least three, or four, or at least four, or five, or at least five, or six, or at least six, or seven, or at least seven, or eight, or at least eight, or nine, or at least nine, or ten, or at least ten, perforations arranged periodically. The more perforations the plate comprises arranged periodically, the more the acoustic insulation of the glazing in which the device is present is improved. In a particularly preferred manner, the plate comprises at least three perforations, more preferably at least four perforations, arranged periodically.

[0075] By "periodically arranged perforations" is meant that said perforations are identical and are present at regular intervals in the plate (i.e. the distance between the centers of two adjacent perforations is constant). The perforations are made over the entire thickness of the plate (they extend from the internal face of the plate to its external face) and put the spaces located on either side of said plate into fluid communication (i.e. they allow the circulation of a fluid, and more particularly of a gas, from one space to the other). Advantageously, the periodic perforations are all aligned, more preferably along a longitudinal axis of the plate (i.e. along the direction of its length). Even more advantageously, the perforations are arranged along a longitudinal axis of the plate located in the middle of the width of the plate.

[0076] The perforations may have any suitable shape. In embodiments, they have a cross-section (i.e., in the principal plane of the plate) which is circular or substantially circular.

[0077] Advantageously, the perforations of the plate are microperforations. By "microperforations" is meant holes whose diameter or maximum dimension (in the main plane of the plate) is less than or equal to 8 mm. Preferably, the perforations have a diameter, or a maximum dimension (in the main plane of the plate) of 0.2 to 8 mm, more preferably of 0.5 to 8 mm. In embodiments, the diameter or maximum dimension of the perforations may be 0.2 to 0.5 mm, or 0.5 to 1 mm, or 1 to 2 mm, or 2 to 3 mm, or 3 to 4 mm, or 4 to 5 mm, or 5 to 6 mm, or 6 to 7 mm, or 7 to 8 mm.

[0078] In a particularly preferred manner, the periodic perforations are distributed over the entire length of the plate. Alternatively, the perforations may be arranged periodically over only a portion of the length of the plate, for example over a portion of the plate having a length less than or equal to 90%, or less than or equal to 80%, or less than or equal to 70%, or less than or equal to 60%, or less than or equal to 50%, or less than or equal to 40%, or less than or equal to 30%, or less than or equal to 20%, or less than or equal to 10%, of the length of the plate.

[0079] For each perforation, a geometric center of said perforation can be defined (hereinafter simply referred to as “center”). The distance between the centers of two adjacent perforations is preferably 5 to 200 mm, more preferably 10 to 110 mm. The distance between the centers of two adjacent periodic perforations may be 5 to 10 mm, or 10 to 20 mm, or 20 to 30 mm, or 30 to 40 mm, or 40 to 50 mm, or 50 to 60 mm, or 60 to 70 mm, or 70 to 80 mm, or 80 to 90 mm, or 90 to 100 mm, or 100 to 110 mm, or 110 to 120 mm, or 120 to 140 mm, or 140 to 160 mm, or 160 to 180 mm, or 180 to 200 mm.

[0080] Advantageously, the open area ratio (i.e. the ratio of the surface area of ​​all the perforations arranged periodically to the total surface area of ​​the plate (including the surface area of ​​the perforations)) is from 0.01 to 8%, preferably from 0.05 to 0.8%. The open area ratio can be 0.01 to 0.05%, or 0.05 to 0.1%, or 0.1 to 0.2%, or 0.2 to 0.3%, or 0.3 to 0.4%, or 0.4 to 0.5%, or 0.5 to 0.6%, or 0.6 to 0.7%, or 0.7 to 0.8%, or 0.8 to 0.9%, or 0.9 to 1%, or 1 to 2%, or 2 to 3%, or 3 to 4%, or 4 to 5%, or 5 to 6%, or 6 to 7%, or 7 to 8%.

[0081] The perforated plate delimits a chamber, in the device itself or in the glazing in which it is arranged. The chamber is located inside the cavity of the glazing.

[0082] The thickness of the chamber is preferably from 2 to 200 mm, more preferably from 5 to 50 mm. The thickness of the chamber corresponds to the dimension of the chamber in a direction perpendicular to the main plane of the plate. In embodiments, the chamber has a thickness of 2 to 5 mm, or 5 to 10 mm, or 10 to 20 mm, or 20 to 30 mm, or 30 to 40 mm, or 40 to 50 mm, or 50 to 60 mm, or 60 to 70 mm, or 70 to 80 mm, or 80 to 90 mm, or 90 to 100 mm, or 100 to 120 mm, or 120 to 140 mm, or 140 to 160 mm, or 160 to 180 mm, or 180 to 200 mm.

[0083] The sizing and configuration of the plate, its perforations and the chamber can be chosen according to the frequency at which the assembly formed by the plate and the chamber is desired to resonate. Indeed, the relationship between the resonant frequency / of the perforated plate and the thickness of the plate, the thickness of the chamber, the spacing between the perforations and the size and distribution of the perforations can be estimated by the formula:

[0084] [Math.l] f =

[0085] In this equation 1, o is the open area ratio (dependent on the size of the perforations and their distribution), L is the thickness of the plate in m, D is the thickness of the chamber in m and d is the distance between the centers of two per- adjacent drillings in m.

[0086] Advantageously, the system consisting of the plate and the chamber is configured to resonate at low frequencies. By "low frequencies" is meant sound waves with a frequency of less than 300 Hz. For example, the system consisting of the plate and the chamber may be configured to resonate at a frequency of less than or equal to 250 Hz, or less than or equal to 225 Hz, or less than or equal to 200 Hz, or less than or equal to 175 Hz, or less than or equal to 150 Hz. In other embodiments, the system consisting of the plate and the chamber may be configured to resonate at a frequency of less than or equal to 400 Hz, or less than or equal to 350 Hz.

[0087] The plate preferably comprises a single series of perforations arranged periodically. Alternatively, it may comprise several series of perforations arranged periodically in the plate, such as at least two series or at least three series, each series being different from the others (for example, the size of the perforations and / or the distance between the centers of two adjacent perforations may be different in each series). When the plate comprises several series of periodic perforations, each series is located in a different portion of the plate (depending on its length). The presence of several different series of periodic perforations allows the system constituted by the plate and the chamber to resonate at several frequencies, each portion of the assembly of the plate and the chamber which comprises a different series of periodic perforations having a different resonance frequency.

[0088] The chamber may comprise a porous absorbent material inside. Preferably, the term “porous absorbent material” means a material characterized by a porosity greater than or equal to 0.7 and / or a resistivity to the passage of air of from 5,000 to 150,000 Nsm4. The porosity of the material may be measured using a porosimeter according to the fluid saturation method, by mercury intrusion. The resistivity to the passage of air may be measured according to standard NF EN ISO 9053-1. The presence of such a porous absorbent material in the chamber may make it possible to increase the acoustic performance of the device and therefore to further improve the acoustic insulation of the glazing in which it is placed.

[0089] The porous absorbent material may have a porosity greater than or equal to 0.75, or greater than or equal to 0.8, or greater than or equal to 0.85, or greater than or equal to 0.9, or greater than or equal to 0.95, for example a porosity of 0.7 to 0.75, or 0.75 to 0.8, or 0.8 to 0.85, or 0.85 to 0.90, or 0.90 to 0.95, or 0.95 to 0.99. Particularly preferably, the porous absorbent material has a porosity of 0.7 to 0.99, and more preferably greater than or equal to 0.9. The air resistance of the porous absorbent material can be from 5,000 to 10,000 Nsm4, or from 10,000 to 20,000 Nsm4, or from 20,000 to 40,000 Nsm 4, or from 40,000 to 60,000 Nsm4, or from 60,000 to 80,000 Nsm4, or from 80,000 to 100,000 Nsm4, or from 100,000 to 120,000 Nsm4, or from 120,000 to 140,000 Nsm 4, or from 140,000 to 150,000 Nsm4. Preferably, the porous absorbent material has a resistivity to the passage of air which is from 20,000 to 100,000 Nsm4.

[0090] The porous absorbent material is advantageously a textile fibrous material, a mineral wool, a polymer foam, or a combination thereof. The textile fibrous material may be a textile made of cotton fibers, linen fibers, hemp fibers, coconut fibers, polyester fibers, cellulose fibers, or a combination thereof. The mineral wool may be selected from the group consisting of glass wool, rock wool, and combinations thereof. The polymer foam may be selected from the group consisting of melamine foams, polyurethane foams, polyethylene foams, and combinations thereof.

[0091] The porous absorbent material may fill the entire chamber. Alternatively, the porous absorbent material may be present in only a portion of the chamber, for example the volume of the porous absorbent material may be 2 to 20%, or 20 to 40%, or 40 to 60%, or 60 to 80%, or 80 to 98%, of the total volume of the chamber.

[0092] Alternatively, or in addition, the chamber may comprise a gas. The gas may in particular be air and / or argon, and / or carbon dioxide, and / or krypton and / or xenon.

[0093] The perforations may be covered by a fabric, in part or, preferably, in full. For example, the fabric may be glued by any suitable means to the plate, such as to the inner face of the plate. Alternatively, or additionally, the fabric may be arranged on a porous absorbent material as described above, for example glued to said porous absorbent material, the porous absorbent material being placed inside the chamber, so that the fabric is against all or part, preferably all, of the perforations. The fabric thus forms a screen against the perforations having a certain resistivity.Without wishing to be bound by a theory, the inventors believe that when the sound wave passes through the fabric to enter the chamber, it encounters a resistivity due to the presence of the fabric, which improves the absorption of sound energy and therefore the acoustic insulation of the glazing comprising the device at low, medium and high frequencies. When the fabric is fixed on a porous absorbent material positioned in the chamber, the acoustic insulation of the glazing is further improved. The fabric advantageously has a thickness ranging from 0.1 to 3 mm, preferably from 0.2 to 1 mm. The fabric can be made of any woven natural or synthetic fibers, such as for example cotton fibers and / or linen fibers. The fabric preferably has a porosity of 0.07 to 0.99, and more preferably from 0.5 to 0.99, and / or . an air resistance of 90,000 to 3,500,000 Nsm4, more preferably 300,000 to 3,000,000 Nsm4. The air resistance and porosity may be measured as above. The fabric may have a porosity of 0.07 to 0.2, or 0.2 to 0.4, or 0.4 to 0.6, or 0.6 to 0.8, or 0.8 to 0.99. The air resistance of the fabric can be from 90,000 to 300,000 Nsm4, or from 300,000 to 500,000 Nsm4, or from 500,000 to 1,000,000 Nsm4, or from 1,000,000 to 1,500,000 Nsm 4, or from 1,500,000 to 2,000,000 Nsm4, or from 2,000,000 to 2,500,000 Nsm4, or from 2,500,000 to 3,000,000 Nsm 4, or from 3,000,000 to 3,500,000 Nsm4.

[0094] Advantageously, the interior of the chamber consists of gas and / or one or more porous absorbent materials as described above, optionally covered with a fabric as described above.

[0095] With reference to [Fig.l], according to a first variant, the device according to the invention comprises at least one rectilinear tubular profile 1. By “tubular profile” is meant a hollow profile, i.e. comprising a cavity or chamber 2. By “rectilinear profile”, is meant that the profile is straight in the direction of its length (a longitudinal axis of the profile can therefore be defined). According to this variant, the device is advantageously a spacing device.

[0096] The tubular profile 1 comprises at least one upper wall 3, one lower wall 4 and two side walls 5 defining the chamber 2 of the profile. In the present text, the terms "upper" and "lower" are used with reference to the orientation of the profile 1 shown on the right-hand side of [Fig.l]. However, the profile 1 can of course have any possible orientation, such as for example an orientation in which the longitudinal axis of the profile is vertical or an orientation in which the upper wall is below the lower wall (as shown on the left-hand side of [Fig.l]).

[0097] The upper wall 3 comprises a plurality of perforations 6 arranged periodically. Thus, the profile 1 according to the invention is also called “perforated (tubular) (rectilinear) profile” in the present text. The perforations 6 are made over the entire thickness of the upper wall and put the chamber 2 of the profile into fluid communication with the environment external to the profile (that is to say they allow the circulation of a fluid, and more particularly of a gas, from the chamber 2 of the profile to the external environment and vice versa).

[0098] In this first variant, the upper wall 3 of the profile corresponds to the plate comprising a plurality of perforations arranged periodically of the device described above, and the chamber 2 of the profile corresponds to the chamber delimited by the plate described above. Thus, everything described in the present text in relation to the perforated plate and in relation to the chamber delimited by the perforated plate applies to the upper wall 3 of the profile 1 and to the chamber 2 of the profile, respec- tively.

[0099] In this variant, the thickness of the chamber inside the profile 1 is the distance between the upper wall 3 and the lower wall 4 of the profile 1.

[0100] The upper wall 3 and the lower wall 4 of the profile may be connected by two side walls 5 (each of the two side walls 5 connecting a longitudinal edge of the upper wall 3 to a longitudinal edge of the lower wall 4). In other embodiments, the upper wall 3 and the lower wall 4 may be connected to each other by any number of walls.

[0101] Advantageously, the main plane of the upper wall 3 and the main plane of the lower wall 4 are parallel to each other and, even more advantageously, they are perpendicular to the main planes of the two side walls 5.

[0102] Preferably, the rectilinear profile 1 comprises, or is made of, a material as mentioned above in relation to the perforated plate.

[0103] Preferably, the lower wall 4 and / or each of the two side walls 5 has a rectangular parallelepiped shape.

[0104] Advantageously, the length of the upper wall 3 of the profile 1 is equal to the length of the cavity between the glazed walls 7 of the glazing 10 in which the device is intended to be placed, in the same direction.

[0105] With reference to [Fig.2], according to a second variant, the device according to the invention comprises at least one rectilinear bar 11. By “bar” is meant a solid of rectangular parallelepiped shape. The bar comprises a plurality of perforations 16 arranged periodically. Thus, the bar 11 according to the invention is also called “perforated (rectilinear) bar” in the present text. According to this second variant, the device is advantageously a spacing device.

[0106] In this second variant, the bar 11 corresponds to the plate comprising a plurality of perforations arranged periodically in the device. Thus, everything described in the present text in relation to the perforated plate applies to the perforated bar.

[0107] When placed in a glazing unit 20 (between two glazed walls 17 of the glazing unit), the perforated bar according to the invention defines a chamber 12 between the glazed walls. This chamber 12 extends from the perforated bar 11 to one of the edges of the glazed walls 17. This edge is advantageously the edge of the glazed walls 17, preferably parallel to the perforated rectilinear bar 11, closest to the perforated rectilinear bar 11.

[0108] In this second variant, the chamber 12 formed between the glazed walls extending from the perforated bar to the edge of the glazed walls corresponds to the chamber delimited by the plate described above. Thus, everything described in the present text in relation to the chamber delimited by the perforated plate applies to the chamber 12 formed between the glazed walls extending from the perforated bar to the edge glass walls.

[0109] In this variant, the thickness of the chamber 12 corresponds to the dimension of the chamber between the perforated bar 11 and the edge of the glazed walls 17.

[0110] Advantageously, the length of the bar 11 is equal to the length of the cavity between the glazed walls 17 of the glazing 20 in which it is intended to be placed, in the same direction.

[0111] With reference to [Fig.3], according to a third variant, the device according to the invention comprises at least one rectilinear box 21. By “box” is meant a hollow closed structure, that is to say comprising a cavity or chamber.

[0112] The box comprises at least one upper wall 23, one lower wall 24, two longitudinal side walls 25 (preferably opposite each other) and two transverse side walls 28 (preferably opposite each other) defining the chamber of the box. By "longitudinal side wall" is meant a side wall parallel to the longitudinal axis of the rectilinear box and by "transverse side wall" is meant a side wall perpendicular to the longitudinal axis of the rectilinear box. In the present text, the terms "upper" and "lower" are used with reference to the orientation of the box 21 shown on the right part of [Fig.3]. Of course, the box can have any other possible orientation, as for example shown on the left part of [Fig.3].The upper wall 23 of the box corresponds to the wall intended to face the center of the cavity formed between the glazed walls 27 of the glazing 30, the lower wall 24 corresponds to the wall of the box 11 intended to be closest to the edge of the glazed walls 27 of the glazing 30, the longitudinal side walls 25 are intended to be parallel to the glazed walls 27 and the transverse side walls 28 are intended to be perpendicular to the glazed walls 27.

[0113] The upper wall 23 and the lower wall 24 of the box may be connected by two longitudinal side walls 25 (each of the two longitudinal side walls 25 connecting a longitudinal edge of the upper wall 23 to a longitudinal edge of the lower wall 24). In other less preferred embodiments, the upper wall 23 and the lower wall 24 may be connected to each other by any number of longitudinal walls 25. The upper wall 23 and the lower wall 24 of the box are preferably connected to each other by two transverse side walls 28 (each of the two transverse side walls 28 connecting a transverse edge of the upper wall 23 to a transverse edge of the lower wall 24).

[0114] Advantageously, the main plane of the upper wall 23 and the main plane of the lower wall 24 are parallel to each other. Preferably, the main planes of the longitudinal side walls 25 are parallel to each other. Preferably, the main planes of the transverse side walls 28 are parallel to each other. Even more advantageously, the main planes of the walls upper 23 and lower 34 are perpendicular to the main planes of the two longitudinal side walls 25 and to the main planes of the two transverse side walls 28. In a particularly preferred manner, the box 21 according to the invention has the shape of a parallelepiped, even more preferably the shape of a rectangular parallelepiped.

[0115] Each of the walls of the box 21 can independently have a rectangular parallelepiped shape, preferably each of the walls of the box 21 has a rectangular parallelepiped shape.

[0116] In this third variant, it is possible to define for the box 21 a length corresponding to the dimension of the box 21 along the longitudinal axis of the rectilinear box and a width corresponding to the dimension of the box 21 along a direction perpendicular to the longitudinal axis of the rectilinear box, in the main plane of the upper wall 23 of the box. In a particularly preferred manner, the width of the box 21 is less than the thickness of the cavity between the glazed walls 27 (along the same direction) of the glazing 30 in which it is intended to be placed. Thus, in this variant, the device is preferably not a spacing device. Preferably, at least one of the longitudinal side walls 25 (one or both) is not in contact with a glazed wall 27 when the box is placed in a glazing 30.

[0117] The width of the box 21 may be from 1 to 99% of the thickness of the cavity between the glazed walls of the glazing, for example from 1 to 10%, or from 10 to 20%, or from 20 to 30%, or from 30 to 40%, or from 40 to 50%, or from 50 to 60%, or from 60 to 70%, or from 70 to 80%, or from 80 to 90%, or from 90 to 99%, of the thickness of the cavity between the glazed walls 27. The width of the box 21 may be from 5 mm to less than the thickness of the cavity between the glazed walls 27, for example the width of the box 21 may be from 5 mm to 29 mm, or from 5 mm to 19 mm, or from 5 mm to 15 mm.

[0118] The length of the box 21 may be less than or equal to the length of the cavity between the glazed walls 27 of the glazing 30 in which it is intended to be placed, in the same direction. Preferably, it is less than the length of the cavity in the same direction. The length of the box 21 may be from 1 to 100% of the length of the cavity, for example from 1 to 10%, or from 10 to 20%, or from 20 to 30%, or from 30 to 40%, or from 40 to 50%, or from 50 to 60%, or from 60 to 70%, or from 70 to 80%, or from 80 to 90%, or from 90 to 95%, or from 95 to 100%, of the length of the cavity between the glass walls 27. In embodiments, the length of the box 21 may be from 5 cm to the length of the cavity between the glass walls 27 (in the same direction as the length of the box 21).

[0119] The upper wall 23 or one of the longitudinal side walls 25 (intended not to be in contact with a glazed wall 27 of the glazing 30 when the box is placed in a glazing) comprises a plurality of perforations 26 arranged periodically. Thus, the box 21 according to the invention is also called “perforated (rectilinear) box” in the present text. The perforations 26 are made over the entire thickness of the wall and put the chamber of the box 21 into fluid communication with the environment external to the box 21.

[0120] In this third variant, the wall of the box 21 comprising the periodic perforations 26 corresponds to the plate comprising a plurality of perforations arranged periodically of the device described above, and the chamber of the box 21 corresponds to the chamber delimited by the plate described above. Thus, everything described in the present text in relation to the perforated plate and in relation to the chamber delimited by the perforated plate applies to the perforated wall of the box 21 and to the chamber of the box, respectively.

[0121] In this variant, the thickness of the chamber inside the box 21 is the distance between the wall of the box comprising the periodic perforations (the upper wall 23 or one of the longitudinal side walls 25) and the wall opposite this wall.

[0122] Preferably, the box 21 comprises, or is made of, a material as mentioned above in relation to the perforated plate.

[0123] The device according to the invention may be according to several of the variants described above at the same time. Thus, the device according to the invention may comprise both one or more perforated profiles 1 and one or more perforated bars 11; both one or more perforated profiles 1 and one or more perforated boxes 21; both one or more perforated bars 11 and one or more perforated boxes 21; or both one or more perforated profiles 1, one or more perforated bars 11 and one or more perforated boxes 21.

[0124] The device according to the invention may comprise a single perforated plate. In particular, the device according to the invention may comprise a single rectilinear tubular profile 1 comprising perforations 6 in its upper wall 3 or a single perforated rectilinear bar 11 or a single perforated rectilinear box 21. However, preferably, the device comprises several perforated plates. More particularly, it advantageously comprises several rectilinear tubular profiles 1 each comprising an upper wall 3 comprising perforations 6 arranged periodically and / or several rectilinear bars 11 comprising perforations 16 arranged periodically and / or several rectilinear boxes 21 comprising perforations 26 arranged periodically in one of its walls.When the device comprises several perforated plates, for example several perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated boxes 21, said perforated plates, perforated rectilinear tubular profiles, bars. perforated rectilinear boxes and perforated rectilinear boxes may each independently be as described above.

[0125] Preferably, when the device comprises several perforated plates, at least some of them are different from each other and they may all be different from each other and / or at least some chambers delimited by said perforated plates are different from each other and they may all be different from each other. In particular, when the device comprises several perforated rectilinear tubular profiles 1, preferably at least some of them are different from each other and they may all be different from each other. More particularly, they may have perforations 6 with a different periodicity, i.e. perforations 6 of different size and / or perforations 6 arranged differently in the upper wall 3 (for example the distance between the centers of two adjacent perforations 6 may be different).Alternatively, or additionally, they may have an upper wall 3 of different thickness and / or a chamber 2 of different thickness. When the device comprises several perforated bars 11, preferably at least some of them are different from each other and they may all be different from each other. In particular, they may have perforations 16 with a different periodicity, i.e. perforations 16 of different size and / or perforations 16 arranged differently (for example the distance between the centers of two adjacent perforations 16 may be different), and / or have a different thickness.Alternatively, or additionally, at least some chambers 12 defined between said perforated bars and the edges of the glazed walls may be different from each other and they may all be different from each other, in particular the chambers 12 may have a different thickness. When the device comprises several perforated rectilinear boxes 21, preferably at least some of them are different from each other and they may all be different from each other. More particularly, they may have perforations 26 with a different periodicity, that is to say perforations 26 of different dimension and / or perforations 26 arranged differently in the wall (for example the distance between the centers of two adjacent perforations 26 may be different).Alternatively, or additionally, they may have a wall comprising perforations of different thickness and / or a chamber 12 of different thickness. Thus, preferably, the perforated plates (in particular the perforated rectilinear tubular profiles 1 and / or the perforated rectilinear bars 11 and / or the perforated rectilinear boxes 21) and the chambers which they delimit are such that at least some of the perforated plates, or all, resonate, with the chambers which they delimit, at different frequencies.

[0126] The device may comprise two or at least two perforated plates (for example, two or at least two perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21) (as described above), or three or at least three perforated plates (for example, three or at least three perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21), or four or at least four perforated plates (for example, four or at least four perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21), or five or at least five perforated plates (for example, five or at least five perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or 21 perforated rectilinear boxes).Preferably, at least two of the perforated plates (for example at least two of the perforated profiles 1 and / or perforated bars 11 and / or perforated rectilinear boxes 21) have perforations with a different periodicity (i.e. the periodicity of the perforations of one plate (for example of a profile or a bar or a box) is different from the periodicity of the perforations of another plate (for example of another profile or another bar or another box)), more preferably, at least three of the perforated plates (for example at least three of the perforated profiles 1 and / or perforated bars 11 and / or perforated boxes 21) have perforations with a different periodicity.

[0127] In a particularly preferred manner, the device according to the invention comprises three perforated plates, and more particularly three perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21, or at least three perforated plates, more particularly at least three perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21, and more preferably four (or at least four) perforated plates, and more particularly four (or at least four) perforated rectilinear tubular profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21. More preferably three or at least three of these plates (in particular three or at least three of these profiles 1 and / or bars 11 and / or boxes 21), with the chambers which they delimit, are configured to resonate at different frequencies.

[0128] Even more preferably, the device comprises at least: - a first perforated plate delimiting a first chamber (in particular a first perforated profile 1 or a first bar 11 or a first box 21), the system constituted by the first perforated plate and the first chamber being configured to resonate at a first frequency, - a second perforated plate delimiting a second chamber (in particular a second perforated profile 1 or a second bar 11 or a second box 21), the system consisting of the second perforated plate and the second chamber being configured to resonate at a second frequency corresponding to a third of an octave below the first frequency, and - a third perforated plate delimiting a third chamber (in particular a third perforated profile 1 or a third bar 11 or a third box 21), the system constituted by the third perforated plate and the third chamber being configured to resonate at a third frequency corresponding to a third octave above the first frequency

[0129] The device may further comprise one or more plates (for example one or more profiles, preferably tubular and preferably rectilinear, and / or bars, preferably rectilinear, and / or boxes, preferably rectilinear) which are not perforated and / or one or more plates (for example one or more profiles, preferably tubular and preferably rectilinear, and / or bars, preferably rectilinear and / or boxes, preferably rectilinear) comprising non-periodic perforations.

[0130] Preferably, the device comprises as many plates (more particularly profiles and / or bars and / or boxes) as the glazed walls of the glazing in which it is intended to be placed comprise sides, for example it comprises four plates (and more particularly four profiles and / or bars and / or boxes).

[0131] The plates of the device may be disjointed (all or some of them) or may be joined to each other (all or some of them), preferably at their ends. Preferably, when the device according to the invention is a spacing device, all the plates of the spacing device are joined so as to form a frame. When the plates are joined, they may form a single piece (the plates coming for example from a single plate folded in one or more places, for example to form the corners of the frame) or may be assembled together by any suitable means, for example by means of staples, glue, clips and / or by interlocking. In particular, when the device comprises profiles, these may be disjointed (all or some of them) or may be joined to each other (all or some of them), preferably at their ends.Preferably, all the profiles of the device are joined so as to form a frame. When the profiles are joined, they may form a single piece (the straight profiles coming for example from a single profile bent in one or more places, for example to form the corners of the frame) or may be joined together by any suitable means, for example by the means indicated above. Similarly, when the device comprises straight bars, these may be disjointed (all or some of them) or may be joined to each other (all or some of them), preferably at their ends. Preferably, all the bars of the device are joined so as to form a frame. When the bars . are joined, they may form a single piece or may be assembled together by any suitable means, for example by the means indicated above. In embodiments in which the device comprises profiles and bars, the upper walls of the profiles and the bars may be joined or disjointed. When the device comprises rectilinear boxes, they are advantageously disjointed.

[0132] When the device comprises several plates, the chambers that they delimit (for example the chambers 2 in the profiles 1 of the device and / or the chambers 12 formed between the glazed walls of the glazing extending from the rectilinear bars to the edges of the glazing) may be closed relative to each other (that is to say they are not directly in fluid communication with each other), for example by the presence of a partition between the chambers, or may be communicating with each other, or some may be closed relative to each other and others communicating with each other. However, when the plates of the device belong to perforated rectilinear boxes 21, the chambers which they delimit, that is to say the chambers inside said boxes, are closed with respect to each other (that is to say, they are not directly in fluid communication with each other)..

[0133] The invention also relates to glazing comprising a device as described above.

[0134] The glazing according to the invention comprises at least two glazed walls. Advantageously, the glazed walls are parallel or essentially parallel to each other.

[0135] In embodiments, the glazing according to the invention may comprise exactly two glazed walls (it is then called “double glazing”), or exactly three glazed walls (it is then called “triple glazing”), or at least three glazed walls, for example four glazed walls (it is then called “quadruple glazing”).

[0136] For the purposes of the present invention, a “glazed wall” means any structure comprising (or consisting of) at least one glass sheet or a glazed assembly. By “glazed assembly” is meant a multi-layer glazed element of which at least one layer is a glass sheet. Thus, the glazed walls may, for example, independently comprise a single glass sheet or a glazed assembly, for example consisting of laminated glazing (as described in more detail below).

[0137] The glass sheet can be made of organic or mineral glass. It can be made of tempered glass.

[0138] The glazed walls (or one of the glazed walls) may comprise (or consist of) a glazed assembly comprising at least one glass sheet which may be as described above. The glazed assembly is preferably laminated glazing. By "laminated glazing" is meant at least two glass sheets between which is inserted at least at least one interlayer film generally made of viscoelastic plastic. The viscoelastic plastic interlayer film may comprise one or more layers of a viscoelastic polymer such as poly(vinyl butyral) (PVB) or an ethylene-vinyl acetate copolymer (EVA), or ethylene copolymer (corresponding to the definition of an ionomer), more preferably PVB. The interlayer film may be made of standard PVB or acoustic PVB (such as single-layer or three-layer acoustic PVB). Acoustic PVB is generally made of three layers: two outer layers of standard PVB and an inner layer of PVB with added plasticizer so as to make it less rigid than the outer layers. The use of glazed walls comprising laminated glazing makes it possible to improve the acoustic insulation of the glazing, the acoustic insulation being further increased when the interlayer film is made of acoustic PVB.

[0139] Each glazed wall comprises two main faces opposite each other corresponding to the faces of the glazed wall having the largest surface areas. Advantageously, the glazed walls independently have a thickness (between their two main faces) greater than or equal to 1.6 mm, for example a thickness of 1.6 to 24 mm, preferably 2 to 12 mm, more preferably 4 to 10 mm, for example 4 or 6 mm. The glazed walls of the glazing according to the invention may all have the same thickness or have different thicknesses. The greater the thickness and / or the higher the density of the glazed walls, the greater the acoustic insulation will be. Furthermore, the thicker the glazed walls, the lower the mass / spring / mass frequency of the glazing will be.

[0140] Preferably, all the glazed walls of the glazing have an identical height and width. The glazing according to the invention may have any possible shape, and preferably has a quadrilateral shape, in particular a rectangular or essentially rectangular shape. Alternatively, the glazing may have a circular, or essentially circular, shape, or an elliptical, or essentially elliptical shape, or a trapezoidal or essentially trapezoidal shape.

[0141] The glazed walls define a cavity between them. Each of the glazed walls defining the cavity comprises an inner face corresponding to the main face of the glazed wall facing the cavity in question and an outer face corresponding to the second main face of the glazed wall, i.e. corresponding to the main face of the glazed wall opposite the face facing the cavity.

[0142] Advantageously, the device according to the invention is positioned in the cavity of the glazing, more particularly in a peripheral zone of the cavity of the glazing. By "peripheral zone of the cavity" is meant a zone of the cavity adjacent to the edges of the glazed walls and preferably of width (i.e. in a direction orthogonal to the edge of the glazed walls, in the plane of the glazed walls) less than or equal to 20 cm, preferably less than or equal to 10 cm, preferably less than or equal to 5 cm.

[0143] Preferably, when the device is a spacing device (in particular, when it comprises one or more perforated profiles and / or perforated bars), the perforated plate(s) of the spacing device are each parallel to an edge of the glazed walls (for example, the perforated rectilinear profile(s) and / or the perforated rectilinear bars are each parallel to an edge of the glazed walls). When the device comprises one or more perforated boxes, the perforated box(es) are preferably each parallel to an edge of the glazed walls.

[0144] In a particularly preferred manner, the device is placed in the cavity of the glazing so that the chamber delimited by the perforated plate is in fluid communication with the cavity of the glazing formed between the glazed walls via the perforations of the plate. Thus, preferably, when the device comprises at least one perforated profile 1, it is placed in the cavity of the glazing so that the upper wall 3 of the profile(s) 1 faces the inside of the cavity of the glazing, the lower wall 4 of the profile(s) 1 being turned towards the outside and the edges of the glazing. Thus, the chamber 2 of the perforated profile(s) 1 is in fluid communication with the cavity of the glazing via the perforations 6 present in the upper wall 3 of said profiles 1 (that is to say that a fluid, and preferably a gas, can circulate from the cavity of the glazing to the interior of the chamber 2 of the profiles 1, and vice versa).When the device comprises at least one perforated box 21, it is placed in the glazing cavity so that the wall comprising the periodic perforations 26 either faces the center of the glazing cavity, or faces a glazed wall without being in contact with it.

[0145] When the device is a spacer device, the two glass walls are fixed to the spacer device.

[0146] More preferably, when the spacing device comprises at least one perforated profile 1, they are fixed to the side walls 5 of the profile(s) 1 of the spacing device, even more preferably their inner face is each fixed to a side wall 5 of the profile(s) 1 of the spacing device.

[0147] When the spacing device comprises at least one perforated bar 11, the two glazed walls are preferably fixed to lateral faces opposite each other of the bar 11.

[0148] Advantageously, the glass walls are attached to the spacer device by gluing, for example by an adhesive, such as a polyisobutylene (PIB) based adhesive, by a silicone sealant or by a double-sided adhesive tape.

[0149] A seal may also be present, preferably disposed on the outer face of the spacer device (i.e., the face of the spacer device closest to the edge of the glass walls), which is preferably the outer face of the wall lower 4 of the profile(s) 1 of the spacing device (when the spacing device comprises at least one perforated profile 1). More preferably, the seal extends from this external face to the edge of the glazed walls. This seal can be made with a sealant (called a “sealing sealant”) based on polyurethane, polysulfide and / or silicone. However, when the spacing device comprises a perforated bar 11, preferably no sealant is present on said bar.

[0150] The spacing device makes it possible to fix the length of the spacing between the glass walls. The length of this spacing (i.e. the thickness of the cavity between the glass walls) can be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm.

[0151] When the device according to the invention is not a spacing device, for example when it comprises one or more perforated boxes 21, said device, and in particular the perforated boxes 21, may be placed on a spacing device. More preferably, the lower wall 24 of the box may rest on the spacing device. When the length of the box is less than the length of the cavity between the glazed walls, the box 21 may be located in any location in the peripheral zone of the glazing cavity.

[0152] Preferably, the cavity of the glazing (between the glazed walls) comprises a gas. The gas may be air and / or carbon dioxide, and / or argon, and / or krypton and / or xenon. The use of argon, krypton or xenon, in addition to or instead of air, makes it possible to improve the thermal insulation of the glazing.

[0153] The glazing according to the invention may be totally opaque, totally transparent, or partly opaque and partly transparent. Preferably, the glazing is at least partly transparent.

[0154] One (or more) of the glazed walls may be tinted in the thickness over all or part of its surface. One (or more) of the glazed walls may be wholly or partly covered with an opaque coating, for example, a paint and / or an enamel. The opaque coating may be present on the inner face of the glazed wall, or on its outer face, or on both faces, preferably it covers the inner face of the glazed wall. In embodiments, only one of the glazed walls of the glazing is covered with an opaque coating. This glazed wall is advantageously the glazed wall intended to be the outermost glazed wall of the glazing when the latter is used in a facade or exterior window of a building.

[0155] In embodiments, the glazed walls of the glazing, or at least one of the glazed walls, may have undergone a treatment to improve the thermal insulation of the glazing. In particular, the glazed wall(s) may comprise one (or more) insulating layer(s) such as an insulating layer based on metal and / or metal oxide. metal, on one or more of their main faces, preferably on the inner face. When the glazed wall is also covered with an opaque coating (such as enamel and / or paint), an insulating layer compatible with the opaque coating is preferably used. Alternatively, the insulating layer and the opaque coating may be arranged on different faces of the glazed wall (for example, the insulating layer may be on the inner face and the opaque coating on the outer face). Alternatively, when at least one of the glazed walls is a glazed assembly, the insulating layer may be interposed in the glazed assembly, for example between a PVB layer and a glass sheet.

[0156] Advantageously, at least one of the perforated plates of the device and the chamber that it delimits are such that the assembly consisting of said perforated plate and said chamber resonates at the so-called “mass / spring / mass” frequency of the glazing (for example, at least one of the profiles 1 of the device comprising on its upper wall 3 perforations 6 arranged periodically is such that it resonates at the mass / spring / mass frequency of the glazing and / or at least one of the bars 11 comprising perforations 16 arranged periodically and the chamber 12 that it delimits are such that they resonate at the mass / spring / mass frequency of the glazing and / or at least one of the boxes 21 comprising perforations 26 arranged periodically is such that it resonates at the mass / spring / mass frequency of the glazing).The presence in the glazing according to the invention of plates (and more particularly of profiles and / or bars and / or boxes) and chambers configured to resonate at the mass / spring / mass frequency of the glazing or at a frequency close to this makes it possible to increase the loss of sound transmission at frequencies close to the mass / spring / mass frequency of the glazing but also at frequencies higher than the mass / spring / mass frequency.

[0157] The mass / spring / mass frequency fmsm of the glazing can be determined by the following formula:

[0158] [Math.2]

[0159] In equation 2, p0 is the density of the air in kg / m3, c0 is the speed of sound in the air cavity in m / s, d is the thickness of the air cavity between the two glass walls in m and msi and ms2 are respectively the masses per unit area of ​​the first and second glass walls in kg / m2.

[0160] Preferably, at least one of the perforated plates of the device and the chamber that it delimits (more particularly at least one of the profiles 1 of the device comprising on its upper wall 3 perforations 6 arranged periodically and / or at least one bars 11 of the device comprising perforations 16 arranged periodically and the chamber 12 which it delimits and / or at least one of the boxes 21 of the device comprising perforations 26 arranged periodically) are configured to resonate at a frequency corresponding to a third of an octave lower than the mass / spring / mass frequency of the glazing, or at a frequency close to it. This makes it possible to increase the loss of sound transmission at frequencies close to this frequency.

[0161] Preferably, at least one of the perforated plates of the device and the chamber that it delimits (more particularly at least one of the profiles 1 of the device comprising on its upper wall 3 perforations 6 arranged periodically and / or at least one of the bars 11 of the device comprising perforations 16 arranged periodically and the chamber 12 that it delimits and / or at least one of the boxes 21 of the device comprising perforations 26 arranged periodically) are configured to resonate at a frequency corresponding to a third of an octave higher than the mass / spring / mass frequency of the glazing, or at a frequency close to it. This makes it possible to increase the sound transmission loss at frequencies close to this frequency.

[0162] The presence, in the glazing, of a device comprising at least two perforated plates delimiting a chamber (in particular at least two perforated profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21) of which at least one plate forms with the chamber that it delimits a system configured to resonate at the mass / spring / mass frequency of the glazing and at least one other plate forms with the chamber that it delimits a system configured to resonate at a third of an octave higher or lower than the mass / spring / mass frequency of the glazing, and preferably at least three perforated plates delimiting a chamber (in particular at least three perforated profiles 1 and / or perforated rectilinear bars 11 and / or perforated rectilinear boxes 21) of which at least one plate forms with the chamber that it delimits a system configured to resonate at the frequency of mass / spring / mass of the glazing,at least one other plate forms with the chamber that it delimits a system configured to resonate at a third of an octave higher than the mass / spring / mass frequency of the glazing and at least one other plate forms with the chamber that it delimits a system configured to resonate at a third of an octave lower than the mass / spring / mass frequency of the glazing, makes it possible to smooth out the loss of sound transmission around the mass / spring / mass frequency of the glazing and to improve the acoustic insulation of the glazing over a wider frequency band around the mass / spring / mass frequency of the glazing.

[0163] In advantageous embodiments, the glazing according to the invention may have acoustic insulation (determined for example by a measurement of the index sound reduction, in particular according to the ISO 10140 standard) higher than identical glazing but not including perforations arranged periodically in the plates of the device, over a frequency range from 200 to 2000 Hz, preferably from 100 Hz to 5000 Hz, more preferably from 50 Hz to 20,000 Hz.

[0164] The glazing according to the invention can be used in any application using glazing. In particular, the glazing according to the invention can be building glazing. The glazing can be intended to provide the interface between the exterior and the interior of the building, and can for example be facade glazing, window glazing or door glazing. Alternatively, the glazing can be intended to be placed inside the building.

[0165] The invention also relates to a method of manufacturing glazing as described above comprising: - the supply of at least two glass walls; - the supply of a device as described above; - the arrangement of the two glass walls so as to form a cavity between them; and - introduction of the device into the cavity.

[0166] In a particularly preferred manner, the device is placed in the cavity of the glazing so that the chamber delimited by the perforated plate of the device is in fluid communication with the cavity of the glazing via the perforations of the plate of the device.

[0167] Preferably, when the device is a spacing device, the manufacturing method comprises a step of fixing the two glazed walls to the spacing device. More preferably, when the spacing device comprises at least one perforated profile 1, the two glazed walls are fixed to the spacing device so that the upper wall 3 of the profile(s) 1 of the spacing device comprising the perforations 6 arranged periodically faces the cavity formed between the glazed walls of the glazing.

[0168] Examples

[0169] The following examples illustrate the invention without limiting it.

[0170] Example 1 - Measurement of acoustic absorption

[0171] The sound absorption of different metallic devices was measured using an impedance tube (Kundt tube) of 100 mm diameter.

[0172] Three devices each comprising five aluminum profiles having a 5.65 mm thick chamber (between their upper wall and their lower wall) and a 0.35 mm thick upper wall were manufactured. In each device, the five profiles were fixed next to each other by their lateral faces, the five profiles being arranged in the same orientation (the upper walls of the profiles are all in the same main plane).

[0173] In two of the three devices, perforations have been drilled in the upper wall of each profile, periodically (along a longitudinal axis of the profile passing through the middle of the width of the profile), the third device is left without perforations. With the exception of the perforations, the three devices are identical.

[0174] The characteristics of the perforations of the three devices are as follows: - device no. 1: perforations of 0.8 mm diameter, the distance between the centers of two adjacent perforations being 15 mm; - device no. 2: perforations of 1 mm diameter, the distance between the centers of two adjacent perforations being 30 mm; - device no. 3: no perforation.

[0175] The sound absorption of each of the three tested devices as a function of frequency was measured according to ISO 10534-2. The results are shown in [Fig.4],

[0176] It can be seen that devices No. 1 and No. 2 have a higher sound absorption coefficient from a certain frequency. Better absorption of sound energy results, in glazing, in better sound insulation.

[0177] An absorption peak is observed for device No. 1 at approximately 1200 Hz and an absorption peak for device No. 2 at approximately 1000 Hz. In order to obtain the absorption peaks of the profiles in lower frequencies, the thickness of the chamber can be increased.

[0178] Example 2 - Measurement of the acoustic insulation of glazing

[0179] A first glazing unit according to the invention (glazing unit No. 1) was manufactured. This glazing unit comprises two rectangular glazed walls of non-tempered, non-laminated monolithic glass, each having the following dimensions: 1480 mm in length, 1230 mm in width and 4 mm in thickness. The two glazed walls are fixed to a spacer device positioned in a peripheral zone of the glazed walls, so as to form a cavity 16 mm thick between them. The cavity of the glazing unit comprises air. The spacer device consists of four profiles forming a frame. Each profile consists of a tube with a rectangular cross-section comprising an upper wall, a lower wall opposite the upper wall and two side walls, connecting the upper wall to the lower wall, on which the glazed walls are fixed. Each profile has a chamber 15 mm thick (between its upper wall and its lower wall) and 16 mm wide.Two of the profiles are 1440 mm long and the other two profiles are 1165 mm long. The profiles are made of composite material including fiberglass and have 1.2 mm wall thickness. The top wall of each profile includes perforations aligned and periodically distributed along a longitudinal axis of the profile passing through the middle of the profile width. The perforations have a diameter of 4 mm and the distance between . the centers of two adjacent perforations is 80 mm.

[0180] A second glazing according to the invention (glazing no. 2) was manufactured. This glazing is identical to glazing no. 1 except that the distance between the centers of two adjacent perforations is 110 mm and that the chambers of the profiles include a glass wool strip, sold by Isover under the trade name Domisol LV, of the same length as the profile in which it is located (i.e. 1440 mm or 1165 mm depending on the profile), 15 mm wide and 15 mm thick.

[0181] A comparative double glazing (glazing no. 3) of type 4(16)4 was also manufactured. This double glazing differs from glazing no. 1 only in that the profiles do not include any perforations.

[0182] The spectrum of the sound reduction index (R) of the three glazings was measured as a function of frequency, according to the measurement protocol defined by the ISO 10140 standard.

[0183] The results are shown in [Fig.5] and in the table below.

[0184] [Tables 1] Acoustic index Glazing No. 1 Glazing No. 2 Glazing No. 3 Ra (dB) 29.7 31.2 28.9 Rx.tr (dB) 27.2 28.8 26.2 RW(C ;Ctr) (dB) 31(-l;-4) 33(-2;-4) 30(-l;-4)

[0185] The acoustic indices are determined according to the ISO 717-1 standard.

[0186] It is noted that the presence of periodic perforations in the profiles of the spacing device allows an improvement in the acoustic performance of the glazing, in particular for frequencies around the mass / spring / mass frequency of the glazing, but also for frequencies higher than the mass / spring / mass frequency of the glazing, in particular for frequencies between 200 and 2000 Hz. An increase in the acoustic indices Rw, RA and RAjtr is thus observed for glazings No. 1 and No. 2 compared to comparative glazing No. 3. In addition, the presence of mineral wool in the profiles of the spacing device allows a further improvement in the acoustic insulation of the glazing.

[0187] As mentioned previously, a device according to the invention is also remarkable in that it makes it possible to significantly limit the presence of humidity between the glazed walls of the glazing. Such properties are therefore added to those described above in connection with acoustic insulation, so as to obtain glazing that is much more efficient than those of the prior art.

[0188] In its general principle, as regards the aspects linked to the limitation of the presence of moisture between the glazed walls of the glazing, the invention consists of equipping the glazing device with desiccant means configured to absorb moisture in the chamber delimited by the plate of said device.

[0189] By "desiccant means", we conventionally refer to means which have the property of drying the atmosphere in which they are placed, or, in other words, of absorbing all or part of the humidity contained in this atmosphere. The use of such desiccant means is based on a desire to absorb said humidity before it transforms into water.

[0190] We will now describe different embodiments of the glazing device, in which such desiccant means are present. More particularly, these different embodiments aim to describe different configurations / dispositions / arrangements of said desiccant means.

[0191] For the sake of simplicity, the description of these modes is carried out by considering that the glazing device is in accordance with that described above with reference to [Fig. 1]. Of course, such considerations are not limiting of the invention, and all the modes described below are adaptable without difficulty, according to all technically operative combinations, to the other configurations (bar, box, etc.) described previously.

[0192] [Fig.6] schematically represents, in a longitudinal sectional view, a particular embodiment of the device 1 of [Fig.l].

[0193] As illustrated by [Fig.6], the device 1 comprises, in this embodiment, a porous absorbent material 50 held in a fixed position inside the chamber 2. Said porous absorbent material 50 conforms to the characteristics already mentioned previously. In particular, it is preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0194] More particularly, the porous absorbent material 50 occupies the entire volume of the chamber 2. It is therefore understood that maintaining said porous absorbent material 50 in a fixed position results from this configuration within the chamber 2.

[0195] Furthermore, in the embodiment of [Fig.6], the desiccant means of the device 1 comprise so-called “internal” desiccant means which are arranged inside the chamber 2. More particularly, said internal desiccant means comprise granules 60 integrated, preferably in a non-agglomerated manner (i.e. in an individualized manner), in the porous absorbent material 50.

[0196] Said granules 60 are for example made of molecular sieve, silica gel, calcium chloride (CaCl2), sodium sulfate (Na2SO4), activated carbon, zeolites of chemical formulation M2 / nO.A12O3.xSiO2.yH2O; M can be replaced by Ca, Mg, K, Na. In general, any material known to man of the trade for producing desiccant means can be used as granules.

[0197] It is understood that in the embodiment of [Fig.6], because the porous absorbent material 50 is kept fixed in the chamber 2, the internal desiccant means in the form of granules 60 are also kept in a fixed position therein. This advantageously prevents any release of the granules 60 through the perforations 6 of the upper wall 3.

[0198] Furthermore, it is important to note that considering a porous absorbent material 50 occupying the entire volume of the chamber 2 constitutes only one variant of implementation of the invention. Thus, nothing excludes considering other configurations, such as for example a configuration according to which the porous absorbent material 50 occupies only a part of the volume of the chamber 2 and is kept fixed inside the latter according to any method known to those skilled in the art, for example by using appropriate adhesive means.

[0199] [Fig.7] schematically represents, in a longitudinal sectional view, yet another particular embodiment of the device 1 of [Fig.1].

[0200] As illustrated by [Fig.7], the device 1 comprises a porous absorbent material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to [Fig.6], and occupying the entire volume of the chamber 2.

[0201] Unlike the embodiment of [Fig.6], in which granules 60 were used, the internal desiccant means here comprise a bar 65 arranged in a cavity 55 of said absorbent material 50.

[0202] No limitation is attached to the shape of the bar 65. For example, the bar 65 may be parallelepipedal or cylindrical. According to other examples, the bar 65 may have, in cross section, a profile in the shape of a diamond, a star, etc.

[0203] Said bar 65 is made of a solid material, such as for example a material such as those mentioned above with reference to the granules of [Fig.6], and occupies the entire space delimited by the cavity 55. The positioning of the bar 65 in the cavity 55 can be carried out by insertion, or by injection of desiccant material.

[0204] Of course, in a similar manner to what has been described with reference to [Fig. 6], nothing precludes the possibility that the porous absorbent material 50 occupies only a part of the volume of the chamber 2 and is kept fixed inside the latter according to any method known to those skilled in the art, for example by using appropriate adhesive means. Nothing precludes the possibility that the bar 65 occupies only a part of the space delimited by the cavity 55.

[0205] Furthermore, the invention also covers embodiments in which the porous material 50 comprises not only granules 60 but also a cavity 55 within which a bar 65 is housed.

[0206] [Fig.8] schematically represents, in a longitudinal sectional view, yet another particular embodiment of the device 1 of [Fig.1].

[0207] As illustrated by [Fig.8], the device 1 comprises a porous absorbent material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to [Fig.6].

[0208] Furthermore, in this embodiment, the device 1 comprises internal desiccant means held in a fixed position in the chamber 2 and which comprise two envelopes 70, 80 respectively arranged at opposite ends of the chamber 2, each of said envelopes 70, 80 comprising granules corresponding to the same characteristics as those described with reference to [Fig.8].

[0209] Each envelope 70, 80 may be made of a flexible or rigid material, such as for example paper, plastic, polymer or plant or woven fibers. Of course, since each envelope 70, 80 and the granules it contains belong to the desiccant means of the device 1, said envelope 70, 80 is provided with features allowing the granules to absorb moisture. These perforations are conventionally of diameters smaller than those of the granules so that the latter cannot escape from the envelope 70, 80 which contains them.

[0210] Furthermore, in the embodiment described here with reference to [Fig.8], the fixed position of said envelopes 70, 80 is maintained by (direct) contact of each of them with the internal wall of the chamber 2 and the porous absorbent material 50. To do this, said porous absorbent material 50 occupies all the remaining volume of the chamber 2, that is to say the total volume of the chamber 2 from which the respective volumes of the two envelopes 70, 80 are subtracted.

[0211] The embodiment of [Fig.8] can be declined according to multiple variants. For example, it is possible to envisage the following variants, possibly combined with each other when this is technically effective: - the porous absorbent material 50 comprises granules, as already described with reference to [Fig. 6], and / or a bar 65, as already described with reference to [Fig. 7], - the porous absorbent material 50 is not in contact with at least one of the two envelopes 70, 80, possibly with the two envelopes 70, 80, so as to occupy a volume smaller than the volume left free by the two envelopes 70, 80 within the chamber 2. Therefore, each envelope 70, 80 which is not in contact with the porous absorbent material 50 is kept fixed inside the chamber 2 according to any method known to those skilled in the art, for example by using appropriate adhesive means. The porous absorbent material 50 is kept in a fixed position according to similar characteristics, - no porous absorbent material is present in the volume left free by the two envelopes 70, 80 within chamber 2.

[0212] Furthermore, the mode of [Fig. 8] has been described up to now considering the presence of two envelopes 70, 80. It should however be noted that the number of envelopes does not constitute a limitation of the invention. Thus, nothing excludes the possibility of considering a single envelope or even more than two envelopes, for example three envelopes 70, 80, 90 including two envelopes 70, 80 respectively arranged at opposite ends of the chamber 2 as well as an envelope 90 arranged substantially centrally between said two envelopes 70, 80, as is shown in a non-limiting manner in [Fig. 9].

[0213] Finally, whatever the number of envelopes envisaged, the positioning of these within the chamber 2 does not constitute a limitation of the invention.

[0214] [Fig. 10] schematically represents, in a longitudinal sectional view, yet another particular embodiment of the device 1 of [Fig. 1].

[0215] As illustrated by [Fig. 10], the device 1 comprises a porous absorbent material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to [Fig. 6].

[0216] Furthermore, in this embodiment, the device 1 comprises internal desiccant means held in a fixed position in the chamber 2 and which comprise a plate 100, called an “absorbent” plate, made of a solid material, such as for example a material such as those mentioned above with reference to the granules of [Fig.6]. By “plate”, we refer here to a rigid element with a (substantially) flat surface.

[0217] More particularly, in the embodiment of [Fig. 10], the plate 100 extends horizontally over the entire internal surface of the lower wall 4 of the device 1, without occupying the entire volume of the chamber 2. The remaining volume of the chamber 2 is entirely occupied by the porous absorbent material 50. In this way, a stack of a first layer and a second layer is obtained, called an “absorbent stack” EMP, said two layers being parallel to the perforated plate 3 of the device 1.

[0218] The fact that said EMP absorbent stack occupies the entire internal volume of the chamber 2 ensures that it is kept in a fixed position.

[0219] The embodiment of [Fig. 10] can be declined according to multiple variants. For example, it is possible to envisage the following variants, possibly combined with each other when this is technically effective: - only the absorbent plate 100 is present in the chamber 2, no porous absorbent material 50 being used, - the absorbent plate 100 extends horizontally over only part of the internal surface of the lower wall 4 of the device 1, - the porous absorbent material 50 occupies a volume less than the volume left free by the absorbent plate 100, - the porous absorbent material 50 comprises granules, as already described with reference to [Fig. 6], and / or a bar 65, as already described with reference to [Fig. 7].

[0220] Furthermore, the mode of [Fig. 10] has been described up to now considering the presence of a single absorbent stack EMP. It should however be noted that the number of such absorbent stacks does not constitute a limitation of the invention. Thus, nothing excludes considering more than one absorbent stack, for example two absorbent stacks EMP_1, EMP_2 superimposed so as to fill the internal volume of the chamber 2, as is shown in a non-limiting manner in [Fig. 11]. In this example of [Fig.11], the stack EMP_1 (respectively the stack EMP_2) comprises a plate 101 (respectively a plate 102) as well as a layer of porous absorbent material 51 (respectively a layer of porous absorbent material 52).

[0221] The internal desiccant means have been described so far considering that they were kept in a fixed position in the chamber 2 of the device 1. These considerations are however not limiting of the invention, the invention also covering other embodiments in which only a part, or even none, of said internal desiccant means is fixed. These other modes are preferably implemented when the device 1 is positioned in the lower part of the glazing, so that the internal desiccant means not kept in a fixed position cannot escape through the perforations 6 due to the action of gravity.

[0222] Furthermore, it has also been considered up to now that the device 1 comprises only internal desiccant means. However, nothing precludes considering still other embodiments in which the desiccant means of the device 1 comprise, solely or in combination with internal desiccant means, desiccant means arranged fixedly outside said chamber 2, called “external desiccant means”, in contact with the perforated plate 3 and arranged so as to leave said perforations 6 free.

[0223] As an example, a configuration of this type is illustrated schematically in [Fig. 12]. More particularly, in this example, the desiccant means comprise only external desiccant means formed by six bars 111, 112, 113, 114, 115, 116 made of a solid material corresponding for example to the same characteristics as those described with reference to the plate 100 of [Fig. 10].

[0224] Said bars 111, 112, 113, 114, 115, 116 are positioned in contact with the perforated plate 3, each bar being separated from a neighboring bar by a perforation 6. What is more, each bar is held in a fixed position according to any method known to those skilled in the art, for example by using appropriate adhesive means.

[0225] Of course, considering six bars as external desiccant means is only one variant of implementation of the invention. Nothing excludes to consider a different number of bars, no limitation being attached to this aspect.

[0226] Furthermore, the fact of considering external desiccant means in the form of bars does not constitute a limitation of the invention. As such, the external desiccant means may take any form described above with reference to the embodiments in which the device 1 comprises internal desiccant means.

Claims

Claims

1. Glazing (10, 20, 30) comprising at least two glazed walls (7, 17, 27) forming a cavity between them, wherein the cavity comprises at least one device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a chamber (2, 12) arranged in the cavity, the device further comprising desiccant means configured to absorb moisture present in said at least one chamber, the chamber delimited by the perforated plate (3, 11, 23) being in fluid communication with the cavity of the glazing formed between the glazed walls (7, 17, 27) via the perforations (6, 16, 26) of the plate (3, 11, 23), and the perforated plate (3, 11, 23) and the chamber (2, 12) which it delimits being configured to resonate at a low frequency.

2. Glazing (10, 20, 30) according to claim 1, in which the desiccant means comprise desiccant means arranged inside said at least one chamber, called “internal desiccant means”.

3. Glazing (10, 20, 30) according to claim 2, wherein a porous absorbent material (50) is present inside said at least one chamber (2, 12), preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, said fixedly arranged internal desiccant means comprising granules (60) integrated in said porous absorbent material and / or a bar (65) arranged in a cavity of said porous absorbent material.

4. Glazing (10, 20, 30) according to any one of claims 2 to 3, in which the internal desiccant means comprise granules gathered in at least one envelope (70, 80, 90).

5. Glazing (10, 20, 30) according to claim 4, wherein at least one envelope (70, 80) is held in a fixed position by contact with an internal wall of said at least one chamber and a porous absorbent material (50) present inside said at least one chamber (2, 12), preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

6. Glazing (10, 20, 30) according to any one of claims 4 to 5, in which said at least one envelope comprises: - two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber, or - three envelopes, including two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber as well as one envelope (90) arranged substantially centrally between said two envelopes arranged at the ends.

7. Glazing (10, 20, 30) according to any one of claims 2 to 6, in which the internal desiccant means comprise at least one plate (100) made of a solid material, called an “absorbent” plate.

8. Glazing (10, 20, 30) according to claim 7, in which said internal desiccant means comprise a stack (EMP) of a first layer and a second layer, called an "absorbent stack", said two layers being preferably parallel to the perforated plate, the first layer being a said absorbent plate (100) and the second layer being a porous absorbent material (50) present inside said at least one chamber (2, 12), preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

9. Glazing (10, 20, 30) according to claim 8, in which the internal desiccant means comprise a plurality of absorbent stacks (EMP_1, EMP_2).

10. Glazing (10, 20, 30) according to any one of claims 2 to 9, in which all or part of the internal desiccant means are held in a fixed position in said at least one chamber.

11. Glazing (10, 20, 30) according to any one of claims 1 to 10, in which the desiccant means comprise desiccant means (111, 112, 113, 114, 115, 116) arranged fixedly outside said at least one chamber, called "external desiccant means", in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

12. Glazing (10, 20, 30) according to any one of claims 1 to 11, wherein said at least one perforated plate (3, 11, 23) comprises at least three perforations (6, 16, 26), preferably at least four perforations (6, 16, 26).

13. Glazing (10, 20, 30) according to one of claims 1 to 12, comprising at least two plates (3, 11, 23), preferably at least three plates (3, 11, 23), each comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a chamber (2, 12) arranged in the cavity, preferably the periodicities of the perforations (6, 16, 26) of at least two of the plates (3, 11, 23), more preferably of at least three plates (3, 11, 23), are different from each other.

14. Glazing (10, 20, 30) according to one of claims 1 to 13, in which at least one perforated plate (3, 11, 23) and the chamber (2, 12) which it delimits are configured to resonate at the mass / spring / mass frequency of the glazing.

15. Glazing (10, 20, 30) according to claim 14, wherein the device further comprises: - at least one second plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a second chamber (2, 12) arranged in the cavity, said second plate (3, 11, 23) and chamber (2, 12) being configured to resonate at the third octave frequency lower than the mass / spring / mass frequency of the glazing; and - at least one third plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a third chamber (2, 12) arranged in the cavity, said third plate (3, 11, 23) and chamber (2, 12) being configured to resonate at the third octave frequency higher than the mass / spring / mass frequency of the glazing.

16. Glazing (10) according to one of claims 1 to 15, in which the device is a spacing device fixed to each of the two glazed walls (7) and comprises: - at least one rectilinear tubular profile (1) comprising an upper wall forming said at least one perforated wall, or - at least one rectilinear bar (11), in which the bar (11) forms said at least one perforated plate.

17. Glazing (10, 20, 30) according to one of claims 1 to 16, in which the device is positioned in a peripheral zone of the cavity of the glazing (10, 20, 30).

18. Glazing (10, 20, 30) according to one of claims 1 to 17, being a building glazing, such as a facade, window or building door glazing or an interior glazing.

19. Device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically, said device being suitable for the manufacture of a glazing according to any one of claims 1 to 18.

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