Glazing incorporating perforated features and exhibiting improved acoustic insulation performance; glazing device and manufacturing process

Abstract

The invention relates to a glazing unit (10) comprising glazed walls (7) forming a cavity, which cavity includes a device comprising at least one plate (3) having a plurality of perforations (6) arranged periodically and defining a chamber (2) located within the cavity, the chamber (2) containing a compressible porous absorbent material (8) arranged to be, in a first state of insertion, compressed for its introduction into said chamber (2), and, in a second state of operation, expanded to conform to the walls of said chamber (2), said compressible porous absorbent material retaining the same acoustic performance in said first state of insertion and in said second state of operation. The invention also relates to such a device, and a method for manufacturing the glazing unit. Abstract figure: [Fig. 1]

Description

Title of the invention: GLAZING COMPRISING PERFORATED DEVICES AND EXHIBITING IMPROVED ACOUSTIC INSULATION PERFORMANCE, GLAZING DEVICE AND MANUFACTURING PROCESS

[0001] The present invention relates to glazing comprising perforated devices, in particular spacing devices.

[0002] The invention also relates to such a perforated device for this glazing.

[0003] The invention also relates to a method for manufacturing such glazing.

[0004] It is known from the prior art of double glazing consisting of two panes of glass separated by a cavity filled with gas, typically air, classically used in windows and building facades for their thermal and acoustic insulation performance.

[0005] However, the sound transmission loss caused by such double glazing decreases for frequencies surrounding the so-called "mass / spring / mass" frequency, which corresponds to the resonance frequency of the double glazing and is located in the low frequencies. This phenomenon, called the mass / spring / mass effect, is due to significant pressure variations in the air cavity at the mass / spring / mass frequency.

[0006] In order to improve the acoustic insulation performance of glazing, various solutions have been developed.

[0007] US document 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 (poly(vinyl butyral)), the second glass plate being separated from a third glass plate by a layer of standard PVB or polyurethane.

[0008] However, this solution does not improve low-frequency sound insulation. To improve low-frequency sound insulation, an existing passive solution is to increase the thickness of the glass panes or the thickness of the glazing cavity. However, this results in bulky and very heavy structures.

[0009] The objective of the present invention is to remedy these drawbacks by proposing a system that improves the acoustic insulation properties of glazing, particularly in the low frequencies, while allowing for relatively light and compact glazing.

[0010] To achieve this objective, the invention first proposes a glazing comprising at least two glazed walls forming a cavity between them, in which the cavity comprises at least one device comprising at least one plate, said plate being a perforated plate comprising a plurality of perforations arranged periodically and delimiting at least one chamber arranged in the cavity, an absorbing material being present inside the chamber.

[0011] Advantageously, the absorbent material comprises at least one porous absorbent material.

[0012] Thus, the invention relates to a glazing comprising at least two glazed walls, forming between them a cavity, in which the cavity comprises at least one device comprising at least one plate, said plate being a perforated plate comprising a plurality of perforations arranged periodically and delimiting at least one chamber, disposed in the cavity, an absorbing material being present inside the chamber.

[0013] According to the invention, at least one said absorbing material present inside the chamber is a compressible porous absorbing material arranged to be, in a first state of introduction, compressed for its introduction into said chamber, and, in a second state of service, relaxed by conforming to the walls of said chamber, said compressible porous absorbing material retaining the same acoustic performance in said first state of introduction and in said second state of service.

[0014] More particularly, said compressible porous absorbent material comprises a polyurethane structure, impregnated with an acrylic-based resin.

[0015] More particularly, said compressible porous absorbent material has a lower elastic compression modulus than glass wool containing fibres, and lower than that of closed structure polyurethane foam.

[0016] More particularly, said compressible porous absorbing material has a compressive elastic modulus between 50 kPa and 200 kPa inclusive.

[0017] More particularly, the device plate has at least three perforations, preferably at least four perforations.

[0018] More particularly, the perforations have a maximum diameter or dimension of 0.2 mm to 8 mm, preferably 0.5 mm to 8 mm.

[0019] More particularly, the centers of the perforations are spaced at a distance of 5 mm to 200 mm, preferably 10 mm to 110 mm.

[0020] More particularly, the thickness of the plate is between 0.1 mm and 15.0 mm, preferably from 0.2 mm to 1.0 mm.

[0021] More specifically, the plate and the chamber it delimits are configured to resonate at a low frequency, less than or equal to 400 Hz, or even to resonate at a frequency less than or equal to 600 Hz.

[0022] More particularly, said glazing comprises at least two plates, preferably at least three plates, each comprising a plurality of perforations, arranged periodically and delimiting a chamber disposed 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.

[0023] More particularly, on the one hand at least one plate of the device comprising a plurality of perforations arranged periodically, and on the other hand the chamber which it delimits, are configured to resonate at the mass / spring / mass frequency of the glazing.

[0024] More particularly, the device further comprises at least one second plate, having a plurality of perforations arranged periodically and delimiting a second chamber disposed in the cavity, said second plate and chamber being configured to resonate at a frequency one-third of an octave lower than the mass / spring / mass frequency of the glazing, and at least one third plate having a plurality of perforations arranged periodically and delimiting a third chamber disposed in the cavity, said third plate and chamber being configured to resonate at a frequency one-third of an octave higher than the mass / spring / mass frequency of the glazing.

[0025] More particularly, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight tubular profile having an upper wall forming said at least one perforated wall, or at least one straight bar, in which the bar forms said at least one perforated plate.

[0026] More particularly, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight tubular profile having at least one upper wall, one lower wall and two side walls defining the chamber, in which the upper wall constitutes the plate having a plurality of perforations arranged periodically, and in which the chamber preferably 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.

[0027] More particularly, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight strip, wherein the strip constitutes the plate having a plurality of perforations arranged periodically, said strip defining the chamber with the two glazed walls, said chamber extending between the two glazed walls, from the strip to an edge of the glazing, and in which the chamber preferably 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.

[0028] More particularly, the device comprises a straight box having 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 having 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, and in which the chamber of the box preferably has a thickness, between the wall of the box having the perforations arranged periodically and the wall opposite it, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0029] More specifically, the device is positioned in a peripheral area of ​​the glazing cavity.

[0030] More particularly, the device further comprises desiccating means configured to absorb moisture present in said at least one chamber.

[0031] More particularly, the desiccating means comprise internal desiccating means arranged inside said at least one chamber, and / or external desiccating means fixedly arranged outside said at least one chamber, in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

[0032] More particularly, the desiccating means comprise internal desiccating means which comprise granules gathered in at least one envelope, wherein at least one envelope is held in a fixed position by contact with an internal wall of said at least one chamber and a secondary 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.

[0033] More particularly, said at least one envelope comprises two envelopes respectively arranged at opposite ends of said at least one chamber, or three envelopes, of which two first envelopes respectively arranged at opposite ends of said at least one chamber and a third envelope arranged substantially centrally between said two first envelopes arranged at the ends.

[0034] More particularly, in addition to said compressible porous absorbing material, another secondary porous acoustic absorbing material is present inside said at least one chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, said internally arranged desiccating means comprising granules integrated into said secondary porous absorbent material and / or a bar arranged in a cavity of said secondary porous absorbent material.

[0035] More particularly, the internal desiccant means comprise granules gathered in at least one envelope.

[0036]

[034] More specifically, at least one envelope is held in a fixed position by contact with an internal wall of said at least one chamber and a secondary 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.

[0037] More particularly, said at least one envelope comprises two envelopes, respectively arranged at opposite ends of said at least one chamber, or three envelopes, of which two first envelopes, respectively arranged at opposite ends of said at least one chamber and a third envelope arranged substantially centrally between said two first envelopes arranged at the ends.

[0038] More particularly, the internal desiccating means comprise at least one plate which is an absorbent plate made of a solid material.

[0039] More particularly, said internal desiccating means comprise an absorbent stack of a first layer and a second layer, said first and second layers being preferably parallel to the perforated plate, the first layer being said absorbent plate and the second layer being a secondary 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.

[0040] More particularly, the internal desiccating means comprise a plurality of absorbent stacks.

[0041] More particularly, all or part of the internal desiccating means are maintained in a fixed position in said at least one chamber.

[0042] More particularly, the desiccating means comprise external desiccating means, fixedly arranged outside said at least one chamber, in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

[0043] More particularly, the chamber delimited by at least one perforated plate is in fluidic communication with the glazing cavity formed between the glazed walls via the perforations of the perforated plate.

[0044] More particularly, the ratio between the surface area of ​​all the perforations of at least one periodically arranged perforated plate and the total surface area of ​​the plate is from 0.001% to 8%.

[0045] More particularly, said glazing is building glazing, such as facade glazing, window or door glazing of a building or interior glazing.

[0046] The invention further relates to a glazing device comprising at least one plate, said plate comprising a plurality of perforations arranged periodically, said device being adapted for the manufacture of such glazing.

[0047]

[0048] The invention further relates to a method for manufacturing such glazing, comprising a first step of supplying at least two glazed walls, a second step of supplying such a device, a third step of arranging the two glazed walls so as to form a cavity between them, and a fourth step of introducing the device into the cavity.

[0049] More particularly, the second step of supplying a device involves selecting a compressible porous absorbing acoustic material arranged to be, in a first state of introduction, compressed for its introduction into said chamber, and in a second state of service, relaxed by conforming to the walls of said chamber, said compressible porous absorbing material retaining the same acoustic performance in said first state of introduction and in said second state of service.

[0050] More particularly, the fourth step of introducing the device into the cavity includes a compression phase of said compressible porous absorbing material for its introduction into the cavity, followed by a relaxation phase of said compressible porous absorbing material to conform to the internal contours of the cavity.

[0051] More particularly, during the fourth step of introducing the device into the cavity, said compressible porous absorbing material is inserted into the cavity and pressed against the internal contours of the cavity before the introduction of any other thermal or sound insulation or desiccant into the cavity.

[0052] More particularly, said fourth step of introducing said device into said cavity comprises placing said device in said cavity of the glazing, so that the chamber delimited by the perforated plate of the device is in fluidic communication with the cavity of the glazing via the perforations of the plate of the device.

[0053] More particularly, said second step of supplying a device provides a device which is a spacing device, and said third step of arranging the two glazed walls includes a phase of fixing the two glazed walls onto the spacing device.

[0054] More particularly, said spacing device comprises at least one perforated profile, and the two glazed walls are fixed to the spacing device so that the upper wall of the profile or profiles of said spacing device having the perforations arranged periodically faces the cavity formed between the glazed walls of the glazing.

[0055] In embodiments, the plate is made of metallic material, preferably aluminum and / or stainless steel, and / or polymer 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 being optionally reinforced with glass fibers.

[0056] In embodiments, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight tubular profile having at least one upper wall, one lower wall and two side walls defining the chamber, in which the upper wall constitutes the plate having a plurality of perforations arranged periodically.

[0057] 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.

[0058] The present invention addresses the need expressed above. More particularly, it provides a glazing device that enables glazing with improved acoustic insulation, especially in the low and medium frequencies, but also in the high frequencies, while being relatively lightweight and compact.

[0059] This is achieved by means of a plate in the device on which a plurality of perforations are periodically arranged, said plate forming a chamber. The combination of the presence of said chamber with the presence of periodic perforations on the plate creates resonators that absorb at least some of the sound energy in the glazing cavity formed by the two glass panes, thereby reducing sound transmission through the glazing. In particular, the resonators absorb sound energy significantly at frequencies close to their resonant frequency(ies). Furthermore, the absorption of energy at the harmonic frequencies of the resonators, as well as physical phenomena related to the modification of the properties of the glazing gas cavity due to the presence of the resonators, also improves sound transmission. acoustic insulation at frequencies above the resonance frequencies of the resonators.

[0060] According to certain particular embodiments, the plate and its perforations, and the chamber, can be dimensioned so that the system formed by the plate and the chamber resonates at the mass / spring / mass frequency of the glazing or at a frequency close to it, making it possible to reduce the mass / spring / mass effect.

[0061] The invention will be further detailed by describing non-limiting embodiments, and based on the accompanying figures illustrating variants of the invention, in which: - [Fig.1] 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 a device according to the invention present in this example of glazing; - [Fig.2] represents on its left part another example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the box of an example of a device according to the invention present in this example of glazing; - [Fig.3] represents on its left part another example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the bar of an example of a device according to the invention present in this example of glazing; - [Fig.4] represents the acoustic energy absorption coefficient (on the ordinate) of device no. 1 (curve A), device no. 2 (curve B) and device no. 3 (curve C) as described in example 1 below, as a function of the sound frequency (on the abscissa, in Hz); - [Fig.5] represents the sound reduction index R (on the ordinate, in dB) of glazing no. 1 (solid light grey curve), glazing no. 2 (solid dark grey curve) and glazing no. 3 (black dotted curve) as described in example 2 below, as a function of the frequency of the sound (on the abscissa, in Hz); - [Fig.6] schematically represents, according to a longitudinal cross-sectional view, a particular embodiment of the device of [Fig.1]; - [Fig.7] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig.1]; - [Fig.8] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig.1]; - [Fig.9] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig.1]; - [Fig. 10] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig. 1] - [Fig. 11] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig. 1] - [Fig. 12] schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of [Fig.1] - [Fig. 13] illustrates, in block diagram form, the steps of a manufacturing process for glazing according to the invention; and - [Fig. 14] illustrates the insertion of a compressible porous absorbent material into a cavity of a profile, by compressing it.

[0062] The invention is now described in more detail and in a non-limiting manner in the following description.

[0063] The invention relates to a glazing 10, 20, 30, comprising at least two glazed walls 7, 17, 27, forming a cavity between them. This cavity comprises at least one device including at least one plate 3, 11, 23. This at least one plate 3, 11, 23 is a perforated plate having a plurality of perforations 6, 16, 26, which are arranged periodically and delimit at least one chamber 2, 12, disposed in the cavity.

[0064] An absorbent material is present inside chamber 2, 12.

[0065] Advantageously, the absorbent material comprises at least one porous absorbent material.

[0066] Improved glazing is described in documents WO2022 / 234237 and WO2024 / 003199.

[0067] According to the invention, at least one such absorbing material present inside chamber 2, 12, is a compressible porous absorbing material 8, which is arranged to be, in a first state of introduction, compressed for its introduction into chamber 6, 12, and, in a second state of service, relaxed by conforming to the walls of chamber 2, 12; this compressible porous absorbing material 8 retaining the same acoustic performance in the first state of introduction and in the second state of service.

[0068] In embodiments, at least one porous absorbing material is present inside the chamber, preferably chosen from a group comprising a polyurethane structure, impregnated with at least one acrylic-based resin.

[0069] More particularly, this at least one compressible porous absorbent material 8 has a lower elastic compression modulus than glass wool containing fibres, and lower than that of closed structure polyurethane foam.

[0070] More particularly, this at least one compressible porous absorbing material 8 has a compressive elastic modulus between 50 kPa and 200 kPa inclusive.

[0071] Glazing can be any type of glazing comprising at least two glazed panes defining a cavity between them. For the purposes of the present invention, the cavity of a glazing unit is defined as the volume enclosed between two glazed panes of said glazing unit.

[0072] The invention further relates to such a device, comprising at least one plate 3,11, 23, this plate 3, 11, 23, comprising a plurality of perforations 6, 16, 26, arranged periodically, this device being adapted for the manufacture of such glazing.

[0073] The device according to the invention may be a glazing spacer. By "spacer", we mean any device for fixing the length of the gap between the glass panes of the glazing in which it is intended to be placed.

[0074] Alternatively, the device according to the invention may not be used as a spacing device.

[0075] The device according to the invention comprises at least one plate having a plurality of perforations arranged periodically (also called "perforated plate" hereafter).

[0076] Preferably, the device plate comprises, or is made of, a metallic material, such as aluminium and / or stainless steel, and / or a polymer 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.

[0077] The plate has two main faces opposite each other and bearing the perforations, referred to in this text as "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).

[0078] For the perforated plate, we can define a length, corresponding to the largest dimension of the plate in the plane of its principal faces (also called the "principal plane of the plate"), and a width, corresponding to the dimension of the plate along 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 along a direction perpendicular to the main plane of the plate (and therefore corresponding to the dimension of the plate between its two main faces).

[0079] The perforated plate is preferably rectangular parallelepiped (that is to say, it has a constant length, width and thickness).

[0080] When the device according to the invention is a spacer, the width of the perforated plate preferably determines the length of the gap between the panes of glass (i.e., the thickness of the cavity between the panes) of the glazing in which the spacer is intended to be used. The width of the plate can be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm or 20 mm, particularly in embodiments where the device is a spacer.

[0081] 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 can 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 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.

[0082] The plate has a plurality of perforations arranged periodically. By "plurality of perforations" is meant at least two perforations. More particularly, the plate may have 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 has arranged periodically, the more the acoustic insulation of the glazing in which the device is located is improved. Particularly preferred, the plate has at least three perforations, more preferably at least four perforations, arranged periodically.

[0083] By "periodically arranged perforations," it is understood 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 inner face of the plate to its outer face) and establish fluidic communication between the spaces located on either side of said plate (i.e., they allow the circulation of a fluid, and more particularly a gas, from one space to another). Advantageously, the periodic perforations are all aligned, more preferably along a longitudinal axis of the plate (i.e., along 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.

[0084] The perforations can have any suitable shape. In some embodiments, they have a cross-section (i.e. in the principal plane of the plate) that is circular or substantially circular.

[0085] Advantageously, the perforations in the plate are micro-perforations. "Micro-perforations" means holes whose diameter or maximum dimension (in the principal plane of the plate) is less than or equal to 8 mm. Preferably, the perforations have a diameter or maximum dimension (in the principal plane of the plate) of 0.2 to 8 mm, more preferably 0.5 to 8 mm. In some 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.

[0086] In a particularly preferred manner, the periodic perforations are distributed along 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.

[0087] For each perforation, a geometric center of said perforation can be defined (hereafter simply called the "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.

[0088] Advantageously, the open area ratio (i.e. the ratio of the area of ​​all the perforations arranged periodically to the total area of ​​the plate (including the area of ​​the perforations)) is from 0.01 to 8%, preferably from 0.05 to 0.8%. The open area ratio can be from 0.01 to 0.05%, or from 0.05 to 0.1%, or from 0.1 to 0.2%, or from 0.2 to 0.3%, or from 0.3 to 0.4%, or from 0.4 to 0.5%, or from 0.5 to 0.6%, or from 0.6 to 0.7%, or from 0.7 to 0.8%, or from 0.8 to 0.9%, or from 0.9 to 1%, or from 1 to 2%, or from 2 to 3%, or from 3 to 4%, or from 4 to 5%, or from 5 to 6%, or from 6 to 7%, or from 7 to 8%.

[0089] The perforated plate delimits a chamber, either in the device itself or in the glazing in which it is located. The chamber is situated inside the cavity of the glazing.

[0090] 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 along a direction perpendicular to the principal plane of the plate. In some 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.

[0091] The dimensions and configuration of the plate, its perforations, and the chamber can be chosen according to the desired resonant frequency of the plate and chamber assembly. Indeed, the relationship between the resonant frequency f of the perforated plate and the plate thickness, the chamber thickness, the spacing between the perforations, and the size and distribution of the perforations can be estimated by the formula: [Math. 1] 2"^ d \ 5¾¾ 7 f = 54000J(o / (L+0.8D)d) where 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 adjacent perforations in m.

[0092] Advantageously, the plate and chamber system is configured to resonate at low frequencies. "Low frequencies" refers to sound waves with frequencies below 400 Hz, or more particularly, below 300 Hz. For example, the plate and chamber system can be configured to resonate at a frequency of 250 Hz or less, or 225 Hz or less, or 200 Hz or less, or 175 Hz or less, or 150 Hz or less. In other embodiments, the plate and chamber system can be configured to resonate at a frequency of 400 Hz or less, or 350 Hz or less.

[0093] 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 has 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 plate and chamber system to resonate at multiple frequencies, with each portion of the plate and chamber assembly containing a different series of periodic perforations having a different resonant frequency.

[0094] More particularly, on the one hand at least one plate 3,11, 23, of the device comprising a plurality of perforations 6, 16, 26, arranged periodically, and on the other hand the chamber 2, 12, which it delimits, are configured to resonate at the mass / spring / mass frequency of the glazing.

[0095] More particularly, the device further comprises at least one second plate 3, 11, 23, having a plurality of perforations 6, 16, 26, arranged periodically and delimiting a second chamber 2, 12, disposed in the cavity, said second plate 3, 11, 23, and chamber 2, 12, being configured to resonate at a frequency one-third of an octave lower than the mass / spring / mass frequency of the glazing, and at least one third plate 3, 11, 23, having a plurality of perforations 6, 16, 26, arranged periodically and delimiting a third chamber 2, 12, disposed in the cavity, these third plates 3, 11, 23, and chamber 2, 12, being configured to resonate at a frequency one-third of an octave higher than the mass / spring / mass frequency of the glazing.

[0096] The chamber comprises, on its interior, at least one absorbing material. "Absorbent" means that the material is acoustically absorbent. Thus, it is possible to broaden the range of wavelengths absorbed by the glazing compared to the range of wavelengths absorbed by the same glazing without the absorbing material. Preferably, the absorbing material is adapted to absorb wavelengths longer than those absorbed by the chamber without the absorbing material.

[0097] Preferably, the absorbing material is a porous absorbing material. Thus, an acoustic wave incident in the chamber can be dissipated by a visco-thermal effect when it penetrates the porous absorbing material. The presence of such a porous absorbing material in the chamber can increase the acoustic performance of the device and therefore further improve the sound insulation of the glazing in which it is placed. Preferably, "porous absorbing material" is understood to mean a material characterized by a porosity greater than or equal to 0.7 and / or an air resistance of 5,000 to 150,000 Nsm⁴. The porosity of the material can be measured using a porosimeter according to the fluid saturation method, by mercury intrusion. Air resistance can be measured according to standard NF EN ISO 9053-1. Preferably, the porous absorbing material is a material with open pores. This allows acoustic noise incident on the porous absorbing material to propagate through it and be dissipated.

[0098] The porous absorbing 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 of 0.75 to 0.8, or of 0.8 to 0.85, or of 0.85 to 0.90, or of 0.90 to 0.95, or of 0.95 to 0.99. Particularly preferred, the porous absorbing 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 absorbing 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 Nsm⁴, 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 Nsm⁴, or from 140,000 to 150,000 Nsm⁴. Preferably, the porous absorbing material has an air resistance of air which is worth 20,000 to 100,000 Nsm 4.

[0099] According to the invention, this porous absorbing material is a compressible porous absorbing material 8, which is arranged to be, in a first state of introduction, compressed for its introduction into the chamber 6, 12, and, in a second state of service, relaxed by conforming to the walls of the chamber 2, 12, this compressible porous absorbing material 8 retaining the same acoustic performance in the first state of introduction and in the second state of service.

[0100] More specifically, this compressible porous absorbent material 8 comprises a polyurethane structure, impregnated with an acrylic-based resin.

[0101] More particularly, this compressible porous absorbent material 8 has a lower elastic compression modulus than glass wool containing fibres, and lower than that of closed structure polyurethane foam.

[0102] More specifically, this compressible porous absorbent material 8 has a compressive elastic modulus between 50 kPa and 200 kPa inclusive.

[0103] In a particular embodiment, this compressible porous absorbent material 8 is a “Compriband” material.

[0104] In a preferred embodiment, this compressible porous absorbent material 8 is unique, and the chamber does not contain any other porous absorbent material.

[0105] In other variants, the chamber may also contain at least one other secondary porous absorbent material, which is then advantageously a textile fiber, a mineral wool, a polymer foam, or a combination thereof. The textile fiber can be a textile made of cotton fibers, flax fibers, hemp fibers, coconut fibers, polyester fibers, cellulose fibers, or a combination thereof. Mineral wool can be selected from the group consisting of glass wool, rock wool, and combinations thereof. Polymer foam can be selected from the group consisting of melamine foams, polyurethane foams, polyethylene foams, and combinations thereof.

[0106] In yet another embodiment, the chamber contains, in addition to at least this compressible porous absorbing material, a granular absorbing material. The granular absorbing material can be sand or a stack of polymer particles. Thus, an acoustic wave incident in the chamber can be dissipated by friction between particles of the granular absorbing material as it penetrates the granular absorbing material. This granular absorbing material can be present in only a portion of the chamber; for example, the volume of the granular absorbing material can be from 2 to 20%, or from 20 to 40%, or from 40 to 60%, or from 60 to 80% of the total volume of the chamber.

[0107] In a preferred embodiment, the chamber does not contain any absorbent material other than the compressible porous absorbent material, and, consequently, no granular absorbent material.

[0108] Alternatively, or in addition, the chamber may contain a gas. The gas may in particular be air and / or argon, and / or krypton and / or xenon.

[0109] The perforations can be covered by a fabric, either partially or, preferably, completely. For example, the fabric can be glued to the plate by any suitable means, such as to the inner surface of the plate. Alternatively, or additionally, the fabric can be placed 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 exhibiting a certain resistivity.Without being bound by any particular theory, the inventors believe that when a sound wave passes through the fabric to enter the chamber, it encounters a resistivity due to the fabric's presence. This resistance improves the absorption of sound energy and thus the acoustic insulation of the glazing containing the device at low, medium, and high frequencies. When the fabric is attached to a porous absorbent material positioned within the chamber, the acoustic insulation of the glazing is further enhanced. 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 cotton 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 value of 90,000 to 3,500,000 Nsm⁴, more preferably 300,000 to 3,000,000 Nsm⁴. Air resistance and porosity may be measured as indicated 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 Nsm 4, or from 300,000 to 500,000 Nsm 4, or from 500,000 to 1,000,000 Nsm 4, or from 1,000,000 to 1,500,000 Nsm 4, or from 1,500,000 to 2,000,000 Nsm 4, or from 2,000,000 to 2,500,000 Nsm 4, or from 2,500,000 to 3,000,000 Nsm 4, or from 3,000,000 to 3,500,000 Nsm 4.

[0110] In a particular variant, the device further comprises desiccating means configured to absorb moisture present in said at least one chamber 2, 12.

[0111] More particularly, these desiccating means comprise internal desiccating means arranged inside this at least one chamber 2, 12.

[0112] [Fig.6] schematically represents, according to a longitudinal cross-sectional view, a particular embodiment of device 1 of [Fig.1].

[0113] As illustrated by [Fig.6], the device 1 comprises, in this embodiment, a porous absorbing material 50 held in a fixed position inside the chamber 2. This porous absorbing material 50 conforms to the characteristics already mentioned above.

[0114] More specifically, the porous absorbent material 50 occupies the entire remaining volume of chamber 2. It is therefore understood that the maintenance in a fixed position of the porous absorbent material 50 results from this configuration within chamber 2.

[0115] Furthermore, in the embodiment of [Fig.6], the desiccating means of the device 1 comprise so-called "internal" desiccating means which are arranged inside the chamber 2. More particularly, said internal desiccating means comprise granules 60 integrated, preferably in a non-agglomerated manner (i.e. in an individual manner), in the porous absorbent material 50.

[0116] Said granules 60 are for example made of molecular sieve, silica gel, calcium chloride (CaC12), sodium sulfate (Na2SO4), activated carbon, zeolites of chemical formulation M2 / nO.A12O3.xSiO2.yH2O; M being able to be replaced by Ca, Mg, K, Na. In general, any material known to those skilled in the art for making desiccants can be used as granules.

[0117] It is understood that in the embodiment of [Fig. 6], because the porous absorbent material 50 is held fixed in the chamber 2, the internal desiccant means in the form of granules 60 are also held in a fixed position therein. This advantageously prevents any release of the granules 60 through the perforations 6 in the upper wall 3.

[0118] Furthermore, it is important to note that considering a porous absorbent material 50 occupying the entire volume of chamber 2 is only one variant of the invention's implementation. Thus, nothing precludes considering other configurations, such as a configuration in which the porous absorbent material 50 occupies only a portion of the volume of chamber 2 and is held fixed within it by any method known to those skilled in the art, for example, by using suitable adhesives.

[0119] [Fig.7] schematically represents, following a longitudinal cross-sectional view, still another particular embodiment of device 1 of [Fig.1].

[0120] As illustrated by [Fig.7], the device 1 comprises a porous absorbing material 50 having 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 chamber 2.

[0121] Unlike the embodiment of [Fig.6], in which granules 60 were used, the internal desiccating means here comprise a bar 65 arranged in a cavity 55 of said absorbent material 50.

[0122] There are no limitations attached to the shape of the bar 65. For example, the bar 65 may be parallelepiped or cylindrical. According to other examples, the bar 65 may have, in cross-section, a profile in the shape of a rhombus, a star, or other.

[0123] 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 placement of the bar 65 in the cavity 55 can be carried out by insertion, or by injection of desiccant material.

[0124] Of course, similarly to what has been described with reference to [Fig. 6], there is nothing to preclude the possibility that the porous absorbent material 50 occupies only a portion of the volume of the chamber 2 and is held fixed within it by any method known to those skilled in the art, for example, by using suitable adhesives. Nor is there anything to preclude the possibility that the bar 65 occupies only a portion of the space delimited by the cavity 55.

[0125] In addition, 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.

[0126] [Fig.8] schematically represents, following a longitudinal cross-sectional view, still another particular embodiment of device 1 of [Fig.1].

[0127] As illustrated by [Fig.8], the device 1 comprises a porous absorbing material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to [Fig.6].

[0128] Furthermore, in this embodiment, the device 1 includes internal desiccating means maintained 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 meeting the same characteristics as those described with reference to [Fig.8].

[0129] Each envelope 70, 80 can be made of a flexible or rigid material, such as paper, plastic, polymer or plant fibers, or woven materials. Naturally, since each envelope 70, 80, and the granules it contains, are part of the desiccating means of device 1, said envelope 70, 80 is provided with perforations allowing the granules to absorb moisture. These perforations are typically smaller in diameter than the granules so that they cannot escape from the envelope 70, 80 that contains them.

[0130] 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 inner wall of chamber 2 and the porous absorbing material 50. To do this, said porous absorbing material 50 occupies all the remaining volume of chamber 2, i.e. the total volume of chamber 2 less the respective volumes of the two envelopes 70, 80.

[0131] The embodiment of [Fig. 8] can be implemented in numerous variations. For example, the following variations are possible, possibly combined where technically feasible:

[0132] - the porous absorbent material 50 comprises granules, as already described in reference to [Fig. 6], and / or a bar 65, as already described with reference to [Fig. 7],

[0133] - the porous absorbent material 50 is not in contact with at least one of the two envelopes 70, 80, possibly with both envelopes 70, 80, so as to occupy a volume less than the volume left free by the two envelopes 70, 80 within chamber 2. Therefore, each envelope 70, 80 that is not in contact with the porous absorbent material 50 is held fixed inside chamber 2 by any method known to those skilled in the art, for example, by using suitable adhesives. The fixed positioning of the porous absorbent material 50 is achieved using similar methods.

[0134] - no porous absorbent material is present in the volume left free by the two envelopes 70, 80 within room 2.

[0135] Furthermore, the method of [Fig. 8] has been described so far considering the presence of two envelopes 70, 80. It should be noted, however, that the number of envelopes does not constitute a limitation of the invention. Thus, nothing precludes considering a single envelope or even more than two envelopes, for example, three envelopes 70, 80, 90, of which two envelopes 70, 80 respectively are arranged at opposite ends of chamber 2 and an envelope 90 arranged substantially centrally between said two envelopes 70, 80, as shown in no way as a limitation in [Fig.9].

[0136] Finally, whatever the number of envelopes envisaged, the positioning of these within chamber 2 does not constitute a limitation of the invention.

[0137] [Fig. 10] schematically represents, following a longitudinal cross-sectional view, yet another particular embodiment of device 1 of [Fig.1].

[0138] As illustrated by [Fig.10], the device 1 comprises a porous absorbing material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to [Fig.6].

[0139] Furthermore, in this embodiment, the device 1 comprises internal desiccating means maintained in a fixed position in the chamber 2 and which include a plate 100, referred to as the "absorbent" plate, made of a solid material, such as, for example, a material like those mentioned above with reference to the granules of [Fig. 6]. By "plate," reference is made here to a rigid element with a (substantially) flat surface.

[0140] 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 absorbing material 50. In this way, a stack of a first layer and a second layer, called the "absorbent stack" EMP, is obtained, said two layers being parallel to the perforated plate 3 of the device 1.

[0141] The fact that said EMP absorbing stack occupies the entire internal volume of chamber 2 ensures that it is held in a fixed position.

[0142] The embodiment of [Fig. 10] can be implemented in numerous variations. For example, the following variations are possible, possibly combined where technically feasible:

[0143] - only the absorbent plate 100 is present in chamber 2, no material porous absorbent 50 not being used,

[0144] - the absorbent plate 100 extends horizontally over only a part of the internal surface of the lower wall 4 of device 1,

[0145] - the absorbent material porous 50 occupies a volume less than the free volume by the absorbent plate 100,

[0146] - the porous absorbent material 50 comprises granules, as already described in reference to [Fig.6], and / or a bar 65, as already described with reference to [Fig.7].

[0147] Furthermore, the mode of [Fig. 10] has been described so far considering the presence of a single EMP absorbing stack. It should be noted, however, that the number of such absorbing stacks does not constitute a limitation of the invention. Thus, nothing precludes considering more than one absorbent stack, for example two absorbent stacks EMP_1, EMP_2 superimposed so as to fill the internal volume of chamber 2, as shown in no way as a limitation 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).

[0148] The internal desiccating means have been described so far assuming that they are held in a fixed position within chamber 2 of device 1. However, these considerations are not limiting to the invention, as the invention also covers other embodiments in which only part, or even none, of said internal desiccating means is fixed. These other embodiments are preferably implemented when device 1 is positioned in the lower part of the glazing, so that the internal desiccating means not held in a fixed position cannot escape through the perforations 6 due to the action of gravity.

[0149] Furthermore, it has also been considered until now that device 1 comprised only internal desiccating means. However, nothing precludes considering other embodiments in which the desiccating means of device 1 comprise, solely or in combination with internal desiccating means, desiccating means fixedly arranged outside said chamber 2, referred to as "external desiccating means", in contact with the perforated plate 3 and arranged so as to leave said perforations 6 free.

[0150] By way of example, a configuration of this type is schematically illustrated in [Fig. 12]. More particularly, in this example, the drying means comprise only external drying means formed by six bars 111, 112, 113, 114, 115, 116 made of a solid material having, for example, the same characteristics as those described with reference to plate 100 of [Fig. 10].

[0151] 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. Moreover, each bar is held in a fixed position by any method known to those skilled in the art, for example by using appropriate adhesive means.

[0152] Of course, considering six bars as external desiccating means is only one variant of the invention's implementation. There is nothing to preclude considering a different number of bars, as there are no limitations attached to this aspect.

[0153] Furthermore, considering external desiccant means in the form of bars does not constitute a limitation of the invention. As such, the desiccant means externals can take any form described above with reference to embodiments in which device 1 includes internal desiccating means.

[0154] More particularly, in addition to the compressible porous absorbent material 8, proper to the invention, another secondary porous absorbent material 50 is present inside at least one chamber 2, 12, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, these internal desiccating means arranged fixedly comprising granules 60 integrated into this other secondary porous absorbent material 50 and / or a bar 65 arranged in a cavity of this other secondary porous absorbent material 50.

[0155] More particularly, the internal desiccant means comprise granules gathered in at least one envelope 70, 80, 90.

[0156] More particularly, at least one envelope 70, 80, is held in a fixed position by contact with an internal wall of at least one chamber 2, 12, and another secondary porous absorbing material 50 present inside at least one chamber 2, 12, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0157] More particularly, said at least one envelope comprises two envelopes 70, 80, respectively arranged at opposite ends of the at least one chamber 2, 12, or three envelopes, of which two first envelopes 70, 80, respectively arranged at opposite ends of the at least one chamber and a third envelope 90 arranged substantially centrally between said two first envelopes arranged at the ends.

[0158] More particularly, the internal desiccating means comprise at least one plate 160 which is an absorbent plate made of a solid material.

[0159] More particularly, said internal desiccating means comprise an EMP stack of a first layer and a second layer, referred to as the "absorbent stack", said two layers being preferably parallel to the perforated plate, the first layer being such an absorbent plate 160 and the second layer being another secondary porous absorbent material 50 present inside at least one chamber 2, 12, preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0160] More particularly, the internal desiccating means comprise a plurality of absorbent stacks (EMP_1, EMP_2).

[0161] More particularly, all or part of the internal desiccating means are maintained in a fixed position in said at least one chamber 2, 12.

[0162] More specifically, the drying means comprise external drying means 111, 112, 113, 114, 115, 116, fixedly arranged outside the at least a chamber 2, 12, in contact with the perforated plate of the at least one chamber 2, 12, and arranged so as to leave said perforations free.

[0163] 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.

[0164] With reference to [Fig. 1], according to a first embodiment, the device according to the invention comprises at least one straight tubular profile 1. By "tubular profile" is meant a hollow profile, that is to say, having a cavity or chamber 2. By "straight profile" is meant that the profile is straight along its length (a longitudinal axis of the profile can therefore be defined). According to this embodiment, the device is advantageously a spacing device.

[0165] 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 this 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. 1]. 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. 1]).

[0166] The upper wall 3 has a plurality of perforations 6 arranged periodically. Thus, the profile 1 according to the invention is also referred to as a "perforated (tubular) (straight) profile" in this text. The perforations 6 are made through the entire thickness of the upper wall and establish fluidic communication between the chamber 2 of the profile and the environment outside the profile (i.e., they allow the circulation of a fluid, and more particularly a gas, from the chamber 2 of the profile to the external environment and vice versa a).

[0167] In this first embodiment, the upper wall 3 of the profile corresponds to the plate having a plurality of periodically arranged perforations 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 this text with respect to the perforated plate and with respect 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, respectively.

[0168] 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.

[0169] The upper wall 3 and the lower wall 4 of the profile can 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 modes In implementation, the upper wall 3 and the lower wall 4 can be connected to each other by any number of walls.

[0170] 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.

[0171] Preferably, the straight profile 1 comprises, or is made of, a material such as mentioned above in relation to the perforated plate.

[0172] Preferably, the lower wall 4 and / or each of the two side walls 5 has a rectangular parallelepiped shape.

[0173] 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.

[0174] With reference to [Fig. 2], according to a second embodiment, the device according to the invention comprises at least one straight bar 11. The term "bar" refers to a rectangular parallelepiped-shaped solid. The bar has a plurality of perforations 16 arranged periodically. Thus, the bar 11 according to the invention is also referred to as a "perforated (straight) bar" in this text. According to this second embodiment, the device is advantageously a spacing device.

[0175] In this second variant, the bar 11 corresponds to the plate having a plurality of periodically arranged perforations of the device. Thus, everything described in this text in relation to the perforated plate applies to the perforated bar.

[0176] When placed in a glazing 20 (between two glazed walls 17 of the glazing), the perforated strip according to the invention defines a chamber 12 between the glazed walls. This chamber 12 extends from the perforated strip 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 straight strip 11, closest to the perforated straight strip 11.

[0177] In this second variant, the chamber 12 formed between the glazed walls extending from the perforated strip to the edge of the glazed walls corresponds to the chamber delimited by the plate described above. Thus, everything described in this 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 strip to the edge of the glazed walls.

[0178] In this variant, the thickness of the chamber 12 corresponds to the dimension of the chamber between the perforated strip 11 and the edge of the glazed walls 17.

[0179] 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.

[0180] 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 closed hollow structure, that is to say, comprising a cavity or chamber.

[0181] The enclosure 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 enclosure. A "longitudinal side wall" is understood to be a side wall parallel to the longitudinal axis of the straight enclosure, and a "transverse side wall" is understood to be a side wall perpendicular to the longitudinal axis of the straight enclosure. In this text, the terms "upper" and "lower" are used with reference to the orientation of the enclosure 21 shown on the right side of [Fig. 3]. Of course, the enclosure can have any other possible orientation, as shown, for example, on the left side 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. .

[0182] The upper wall 23 and the lower wall 24 of the enclosure 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 enclosure 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).

[0183] Advantageously, the principal plane of the upper wall 23 and the principal plane of the lower wall 24 are parallel to each other. Preferably, the principal planes of the longitudinal side walls 25 are parallel to each other. Preferably, the principal planes of the transverse side walls 28 are parallel to each other. Even more advantageously, the principal planes of the upper wall 23 and the lower wall 34 are perpendicular to the principal planes of the two longitudinal side walls 25 and to the principal planes of the two transverse side walls 28. Particularly preferred, the enclosure 21 according to the invention has the shape of a parallelepiped, even more preferably a rectangular parallelepiped.

[0184] 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.

[0185] In this third variant, the length of the box 21 can be defined as corresponding to its dimension along the longitudinal axis of the straight box, and as corresponding to its dimension along a direction perpendicular to the longitudinal axis of the straight box, in the principal plane of the upper wall 23 of the box. Preferably, 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 unit 30 in which it is intended to be placed. Thus, in this variant, the device is preferably not a spacer. 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 unit 30.

[0186] The width of the box 21 can 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 can 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 can be from 5 mm to 29 mm, or from 5 mm to 19 mm, or from 5 mm to 15 mm.

[0187] 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 can 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 glazed walls 27. In some embodiments, the length of the box 21 can be from 5 cm to the length of the cavity between the glazed walls 27 (in the same direction as the length of the box 21).

[0188] The upper wall 23 or one of the longitudinal side walls 25 (designed not to be in contact with a glazed surface 27 of the glazing 30 when the enclosure is placed in glazing) has a plurality of perforations 26 arranged periodically. Thus, the enclosure 21 according to the invention is also referred to as a "perforated (straight) enclosure" in this text. The perforations 26 are made through the entire thickness of the wall and establish fluidic communication between the chamber of the enclosure 21 and the environment outside the enclosure 21.

[0189] In this third variant, the wall of the box 21 having the periodic perforations 26 corresponds to the plate having a plurality of periodically arranged perforations 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 this text with respect to the perforated plate and with respect 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.

[0190] In this variant, the thickness of the chamber inside the box 21 is the distance between the wall of the box having the periodic perforations (the upper wall 23 or one of the longitudinal side walls 25) and the wall opposite this wall.

[0191] Preferably, the box 21 comprises, or is made of, a material such as mentioned above in relation to the perforated plate.

[0192] The device according to the invention can be in several of the variants described above at once. Thus, the device according to the invention can 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.

[0193] The device according to the invention may comprise a single perforated plate. In particular, the device according to the invention may comprise a single straight tubular profile 1 having perforations 6 in its upper wall 3, or a single perforated straight bar 11, or a single perforated straight box 21. However, preferably, the device comprises several perforated plates. More particularly, it advantageously comprises several straight tubular profiles 1, each having an upper wall 3 having perforations 6 arranged periodically, and / or several straight bars 11 having perforations 16 arranged periodically, and / or several straight boxes 21 having perforations 26 arranged periodically in one of their walls.When the device comprises several perforated plates, for example several perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated boxes 21, said perforated plates, perforated straight tubular profiles, perforated straight bars and perforated straight boxes may each independently be as described above.

[0194] 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 The perforated plates are different from one another, and they may all be different from one another. In particular, when the device comprises several perforated straight tubular profiles 1, preferably at least some of them are different from one another, and they may all be different from one another. More specifically, they may have perforations 6 with a different periodicity, that is, perforations 6 of different dimensions 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.

[0195] When the device comprises several perforated strips 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, that is, perforations 16 of different dimensions 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 strips 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.

[0196] When the device comprises several perforated rectilinear chambers 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, perforations 26 of different dimensions 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 having perforations of different thickness and / or a chamber 12 of different thickness.Thus, preferably, the perforated plates (in particular the perforated straight tubular profiles 1 and / or the perforated straight bars 11 and / or the perforated straight boxes 21) and the chambers they delimit are such that at least some, or all, of the perforated plates resonate with the chambers they delimit at different frequencies.

[0197] More particularly, the glazing 10, 20, 30 comprises 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, disposed 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.

[0198] The device may thus comprise two or at least two perforated plates (for example, two or at least two perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) (as described above), or three or at least three perforated plates (for example, three or at least three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21), or four or at least four perforated plates (for example, four or at least four perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21), or five or at least five perforated plates (for example, five or at least five perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) straight lines 21 perforated).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 straight boxes 21) have perforations with a different periodicity (i.e., the periodicity of the perforations of one plate (for example, of a profile or bar or box) is different from the periodicity of the perforations of another plate (for example, of another profile or bar or 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.

[0199] In a particularly preferred manner, the device according to the invention comprises three perforated plates, and more particularly three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21, or at least three perforated plates, more particularly at least three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21, and more preferably four (or at least four) perforated plates, and more particularly four (or at least four) perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight 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 they delimit, are configured to resonate at different frequencies.

[0200] Even more preferably, the device comprises at least:

[0201] a first perforated plate delimiting a first chamber (in particular a first perforated profile 1 or a first strip 11 or a first box 21), the system consisting of the first perforated plate and the first chamber being configured to resonate at a first frequency,

[0202] a second perforated plate delimiting a second chamber (in particular a second perforated profile 1 or a second strip 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 one-third of an octave below the first frequency, and

[0203] a third perforated plate delimiting a third chamber (in particular a third perforated profile 1 or a third strip 11 or a third box 21), the system consisting of the third perforated plate and the third chamber being configured to resonate at a third frequency corresponding to one-third of an octave above the first frequency

[0204] The device may further comprise one or more plates (for example one or more profiles, preferably tubular and preferably straight, and / or bars, preferably straight, and / or boxes, preferably straight) not perforated and / or one or more plates (for example one or more profiles, preferably tubular and preferably straight, and / or bars, preferably straight and / or boxes, preferably straight) comprising non-periodic perforations.

[0205] 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 have sides, for example it comprises four plates (and more particularly four profiles and / or bars and / or boxes).

[0206] The plates of the device may be separated (all or some of them) or may be joined to one another (all or some of them), preferably at their ends. Preferably, when the device according to the invention is a spacer device, all the plates of the spacer device are joined so as to form a frame. When the plates are joined, they may form a single piece (the plates originating, 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 includes profiles, these may be separated (all or some of them) or may be joined to one another (all or some of them), preferably at their ends.Preferably, all the profiles of the device are joined to form a frame. When the profiles are joined, they may form a single piece (straight profiles, for example, originating 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 includes straight bars, these may be separated (all or some of them) or may be joined. to one another (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 separated. When the device comprises straight boxes, they are advantageously separated.

[0207] When the device comprises several plates, the chambers 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 straight bars to the edges of the glazing) can be closed to each other (i.e. they are not directly in fluidic communication with each other), for example by the presence of a partition between the chambers, or can be communicating with each other, or some can be closed to each other and others communicating with each other. However, when the plates of the device belong to perforated rectilinear boxes 21, the chambers that they delimit, that is to say the chambers inside said boxes, are closed to each other (that is to say, they are not directly in fluidic communication with each other)..

[0208] The glazing according to the invention comprises at least two glazed walls. Advantageously, the glazed walls are parallel or essentially parallel to each other.

[0209] 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.

[0210] For the purposes of the present invention, a "glazed wall" means any structure comprising (or consisting of) at least one sheet of glass or a glazed assembly. A "glazed assembly" means a multi-layered glazed element, at least one layer of which is a sheet of glass. Thus, glazed walls may, for example, independently comprise a single sheet of glass or a glazed assembly, for example, made of laminated glass (as described in more detail below).

[0211] The glass sheet can be made of organic or mineral glass. It can be made of tempered glass.

[0212] The glazed walls (or one of the glazed walls) may comprise (or consist of) a glazed assembly including at least one sheet of glass, which may be as described above. The glazed assembly is preferably laminated glass. "Laminated glass" means at least two sheets of glass with at least one interlayer film, generally made of viscoelastic plastic, inserted between them. The film The viscoelastic plastic interlayer can consist of one or more layers of a viscoelastic polymer such as polyvinyl butyral (PVB) or an ethylene-vinyl acetate (EVA) copolymer, more preferably PVB. The interlayer film can be made of standard PVB or acoustic PVB (such as single-layer or triple-layer acoustic PVB). Acoustic PVB generally consists of three layers: two outer layers of standard PVB and an inner layer of PVB with added plasticizer to make it less rigid than the outer layers. The use of glazed walls with laminated glass improves the acoustic insulation of the glazing, and this insulation is further enhanced when the interlayer film is made of acoustic PVB.

[0213] Each glazed panel has two principal faces opposite each other, corresponding to the faces of the glazed panel with the largest surface areas. Advantageously, the glazed panels independently have a thickness (between their two principal 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 panels of the glazing according to the invention may all have the same thickness or different thicknesses. The greater the thickness and / or density of the glazed panels, the greater the sound insulation. Furthermore, the thicker the glazed panels, the lower the mass / spring / mass frequency of the glazing.

[0214] Preferably, all the glazed surfaces of the glazing have identical height and width. The glazing according to the invention can have any possible shape, and preferably has a quadrilateral shape, in particular a rectangular or essentially rectangular shape. Alternatively, the glazing can have a circular, or essentially circular, shape, or an elliptical, or essentially elliptical, shape, or a trapezoidal or essentially trapezoidal shape.

[0215] The glass walls define a cavity between them. Each of the glass walls defining the cavity has an inner face corresponding to the main face of the glass wall facing the cavity in question and an outer face corresponding to the second main face of the glass wall, that is to say corresponding to the main face of the glass wall opposite the face facing the cavity.

[0216] Advantageously, the device according to the invention is positioned in the glazing cavity, more particularly in a peripheral zone of the glazing cavity. By "peripheral zone of the cavity", we mean a zone of the cavity adjacent to the edges of the glazing walls and preferably of width (i.e. in a direction orthogonal to the edge of the glazing walls, in the plane of the glazing walls) less than or equal to 20 cm, preferably even less than or equal to 10 cm, preferably even less than or equal to 5 cm.

[0217] Preferably, when the device is a spacer (in particular, when it comprises one or more perforated profiles and / or perforated strips), the perforated plate(s) of the spacer are each parallel to an edge of the glazed walls (for example, the perforated straight profile(s) and / or perforated straight strip(s) 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.

[0218] In a particularly preferred manner, the device is placed in the glazing cavity such that the chamber delimited by the perforated plate is in fluidic communication with the glazing cavity formed between the glazing walls via the perforations in the plate. Thus, preferably, when the device comprises at least one perforated profile 1, it is placed in the glazing cavity such that the upper wall 3 of the profile(s) 1 faces the interior of the glazing cavity, the lower wall 4 of the profile(s) 1 facing outwards and towards the edges of the glazing. Thus, chamber 2 of the perforated profile(s) 1 is in fluidic communication with the glazing cavity via the perforations 6 present in the upper wall 3 of said profile(s) 1 (i.e. a fluid, and preferably a gas, can circulate from the glazing cavity to the inside of chamber 2 of profile(s) 1, and vice versa).When the device includes at least one perforated box 21, it is placed in the glazing cavity so that the wall with the periodic perforations 26 either faces the center of the glazing cavity or faces a glazed wall without being in contact with it.

[0219] When the device is a spacing device, the two glass walls are fixed to the spacing device.

[0220] More preferably, when the spacing device includes 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 fixed each to a side wall 5 of the profile(s) 1 of the spacing device.

[0221] When the spacing device includes at least one perforated bar 11, the two glazed walls are preferably fixed to opposite lateral faces of the bar 11.

[0222] Advantageously, the glass walls are attached to the spacing device by bonding, for example by an adhesive, such as a polyisobutylene (PIB) based adhesive, by a silicone sealant or by double-sided adhesive tape.

[0223] A sealing gasket may also be present, preferably located on the external face of the spacer (i.e., the face of the spacer closest to the edge of the glazed walls), which is preferably the external face of the lower wall 4 of the profile(s) 1 of the spacer (when the spacer has at least one perforated profile 1). More preferably the gasket The sealant extends from this outer face to the edge of the glazed walls. This sealant can be made with a sealant (called a "sealing sealant") based on polyurethane, polysulfide, and / or silicone. However, when the spacing device includes a perforated strip 11, preferably no sealant is present on said strip.

[0224] The spacing device allows the length of the gap between the glass panes to be fixed. The length of this gap (i.e. the thickness of the cavity between the glass panes) can be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm.

[0225] When the device according to the invention is not a spacer device, for example when it comprises one or more perforated boxes 21, said device, and in particular the perforated boxes 21, can be placed on a spacer device. More preferably, the lower wall 24 of the box can rest on the spacer device. When the length of the box is less than the length of the cavity between the glazed walls, the box 21 can be located anywhere in the peripheral area of ​​the glazing cavity.

[0226] Preferably, the glazing cavity (between the panes of glass) contains a gas. The gas may be air and / or argon, and / or krypton, and / or xenon. The use of argon, krypton, or xenon, in addition to or instead of air, improves the thermal insulation of the glazing.

[0227] The glazing according to the invention can be totally opaque, totally transparent, or partly opaque and partly transparent. Preferably, the glazing is at least partly transparent.

[0228] One (or more) of the glazed panels may be tinted throughout their thickness over all or part of their surface. One (or more) of the glazed panels may be covered in whole or in part with an opaque coating, for example, paint and / or enamel. The opaque coating may be present on the inner face of the glazed panel, or on its outer face, or on both faces; preferably, it covers the inner face of the glazed panel. In some embodiments, only one of the glazed panels of the glazing unit is covered with an opaque coating. This glazed panel is advantageously the outermost glazed panel of the glazing unit when the latter is used in a building facade or exterior window.

[0229] In some embodiments, the glazed surfaces of the glazing, or at least one of the glazed surfaces, may have undergone a treatment to improve the thermal insulation of the glazing. In particular, the glazed surface(s) may have one or more insulating layers, such as a metal and / or metal oxide-based insulating layer, on one or more of their principal faces, preferably on the inner face. When the glazed surface is also covered with an opaque coating (such as enamel and / or paint), preferably an insulating layer compatible with the opaque coating is used. Alternatively, the insulating layer and the opaque coating can be placed on different faces of the glazed wall (for example, the insulating layer can be on the inner face and the opaque coating on the outer face). Alternatively, when at least one of the glazed walls is a single-pane unit, the insulating layer can be sandwiched within the unit, for example, between a layer of PVB and a sheet of glass.

[0230] Advantageously, at least one of the perforated plates of the device and the chamber 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 having on its upper wall 3 periodically arranged perforations 6 is such that it resonates at the mass / spring / mass frequency of the glazing. And / or at least one of the bars 11 having periodically arranged perforations 16 and the chamber 12 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 having periodically arranged perforations 26 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 it 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.

[0231] The mass / spring / mass frequency fmsm of the glazing can be determined by the following formula:

[0232] [Math.2] £ j ..........| 2 d \ /

[0233] where pO is the air density in kg / m3, cO 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 msl and ms2 are respectively the masses per unit area of ​​the first and second glass walls in kg / m2.

[0234] Preferably, at least one of the perforated plates of the device and the chamber it delimits (more particularly, at least one of the profiles 1 of the device having perforations 6 arranged periodically on its upper wall 3 and / or at least one of the bars 11 of the device having perforations 16 arranged periodically and the chamber 12 it delimits and / or at least one of the boxes 21 of the The device, which has 26 periodically arranged perforations, is configured to resonate at a frequency one-third of an octave lower than, or close to, the mass / spring / mass frequency of the glazing. This increases the loss of sound transmission at frequencies close to this frequency.

[0235] Preferably, at least one of the perforated plates of the device and the chamber it delimits (more particularly, at least one of the profiles 1 of the device having periodically arranged perforations 6 on its upper wall 3 and / or at least one of the bars 11 of the device having periodically arranged perforations 16 and the chamber 12 it delimits and / or at least one of the boxes 21 of the device having periodically arranged perforations 26) are configured to resonate at a frequency corresponding to one-third of an octave above 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.

[0236] 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 straight bars 11 and / or perforated straight boxes 21), of which at least one plate forms with the chamber 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 it delimits a system configured to resonate at one-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 straight bars 11 and / or perforated straight boxes 21), of which at least one plate forms with the chamber it delimits a system configured to resonate at the mass / spring / mass frequency of the glazing,at least one other plate, forming with the chamber it delimits a system configured to resonate at one-third of an octave above the mass / spring / mass frequency of the glazing, and at least one other plate, forming with the chamber it delimits a system configured to resonate at one-third of an octave below the mass / spring / mass frequency of the glazing, allows for smoothing the loss of sound transmission around the mass / spring / mass frequency of the glazing and improving the acoustic insulation of the glazing over a wider frequency band around the mass / spring / mass frequency of the glazing.

[0237] In advantageous embodiments, the glazing according to the invention may exhibit higher sound insulation (determined, for example, by a measurement of the sound reduction index, in particular according to ISO 10140) than identical glazing but without perforations arranged in such a way periodic in the plates of the device, over a frequency range from 200 to 2000 Hz, preferably from 100 Hz to 5000 Hz, preferably still from 50 Hz to 20,000 Hz.

[0238] 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 interface between the exterior and 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.

[0239] The invention also relates to a method for manufacturing glazing as described above comprising a succession of steps as seen in [Fig.13], with a first step 100 of supplying at least two glazed walls, a second step 200 of supplying a device as described above, a third step 300 of arranging the two glazed walls so as to form a cavity between them, and a fourth step 400 of introducing the device into the cavity.

[0240] More particularly, the second step 200 of supplying a device involves the selection of a compressible porous absorbing material 8 arranged to be, in a first state of introduction, compressed for its introduction into the chamber 6, 12, and in a second state of service, relaxed by conforming to the walls of the chamber 2, 12, the compressible porous absorbing material 8 retaining the same acoustic performance in the first state of introduction and in the second state of service.

[0241] More particularly, the fourth step 400 of introducing the device into the cavity includes a compression phase of the compressible porous absorbing material for its introduction into the cavity, followed by a relaxation phase of the compressible porous absorbing material to conform to the internal contours of the cavity.

[0242] More specifically, during the fourth step 400 of introducing the device into the cavity, the compressible porous absorbing material 8 is inserted into the cavity by compressing it, as seen in [Fig. 14] (the double arrow represents a compression force), and then is pressed against the internal contours of the cavity before the introduction of any other thermal or sound insulation or desiccant into the cavity.

[0243] In a particularly preferred manner, the fourth step 400 of introducing the device into the cavity comprises placing the device in the cavity of the glazing so that the chamber delimited by the perforated plate of the device is in fluidic communication with the cavity of the glazing via the perforations of the plate of the device.

[0244] Preferably, the second step 200 of supplying a device provides a device that is a spacing device, and the manufacturing process includes, in the third step 300 of arranging the two glazed walls, a phase of fixing the two glass panes onto the spacing device. More preferably, when the spacing device has at least one perforated profile 1, the two glass panes are fixed onto the spacing device so that the upper wall 3 of the profile(s) 1 of the spacing device having the perforations 6 arranged periodically faces the cavity formed between the glass panes of the glazing.

[0245] The following examples illustrate the invention without limiting it.

[0246] Example 1 - Measurement of sound absorption

[0247] The sound absorption of various metallic devices was measured using an impedance tube (Kundt tube) with a diameter of 100 mm.

[0248] Three devices, each comprising five aluminum profiles having a chamber 5.65 mm thick (between their upper and lower walls) and an upper wall 0.35 mm thick, were manufactured. In each device, the five profiles were fixed side by side by their lateral faces, with all five profiles arranged in the same orientation (the upper walls of the profiles are all in the same principal plane).

[0249] In two of the three devices, perforations were made in the upper wall of each profile, periodically (along a longitudinal axis of the profile passing through the middle of the profile's width); the third device was left without perforations. Except for the perforations, the three devices are identical.

[0250] The characteristics of the perforations of the three devices are as follows:

[0251] device no. 1: perforations of 0.8 mm in diameter, the distance between the centers of two adjacent perforations being 15 mm;

[0252] Device No. 2: perforations of 1 mm diameter, the distance between the centers of two adjacent perforations being 30 mm;

[0253] Device No. 3: No perforation.

[0254] The sound absorption of each of the three devices tested as a function of frequency was measured according to ISO 10534-2.

[0255] The results are shown in [Fig.4],

[0256] It is observed that devices No. 1 and No. 2 have a higher sound absorption coefficient above a certain frequency. Better absorption of sound energy translates, in glazing, into better sound insulation.

[0257] 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 at lower frequencies, the thickness of the chamber can be increased.

[0258] Example 2 - Measurement of the sound insulation of glazing

[0259] A first glazing unit according to the invention (glazing unit no. 1) has been manufactured. This glazing unit comprises two rectangular panes of monolithic, untempered, unlaminated glass, each having the following dimensions: 1480 mm in length, 1230 mm in width, and 4 mm in thickness. The two panes are fixed to a spacer positioned in a peripheral area of ​​the panes, so as to form a 16 mm thick cavity between them. The cavity of the glazing unit contains air. The spacer 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, to which the panes are fixed. Each profile has a chamber 15 mm thick (between its upper and lower walls) and 16 mm wide.Two of the profiles are 1440 mm long and the other two are 1165 mm long. The profiles are made of composite material including fiberglass and have 1.2 mm thick walls. The top wall of each profile has perforations aligned and periodically distributed along a longitudinal axis of the profile passing through the middle of its width. The perforations have a diameter of 4 mm and the distance between the centers of two adjacent perforations is 80 mm.

[0260] 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 strip of glass wool, 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), of width 15 mm and of thickness 15 mm.

[0261] A comparative double glazing unit (glazing unit no. 3) of type 4(16)4 was also manufactured. This double glazing unit differs from glazing unit no. 1 only in that the profiles do not include any perforations.

[0262] 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 ISO 10140.

[0263] The results are shown in [Fig.5] and in the table below. [Table 1] Acoustic index Glazing No. 1 Glazing No. 2 Glazing No. 3 RA (dB) 29.7 31.2 28.9 RA,tr (dB) 27.2 28.8 26.2 Rw(C;Ctr) (dB) 31(-1;-4) 33(-2;-4) 30(-1;-4)

[0264] Acoustic indices are determined according to ISO 717 1.

[0265] It is observed that the presence of periodic perforations in the profiles of the spacer device improves the acoustic performance of the glazing, particularly for frequencies around the mass / spring / mass frequency of the glazing, but also for frequencies above the mass / spring / mass frequency of the glazing, notably for frequencies between 200 and 2000 Hz. An increase in the acoustic indices Rw, RA, and RA,tr is thus observed for glazing units No. 1 and No. 2 compared to the comparative glazing unit No. 3. Furthermore, the presence of mineral wool in the profiles of the spacer device provides a further improvement in the acoustic insulation of the glazing.

[0266] In summary, the technical effect related to the choice of the compressible porous absorbent material, in addition to its acoustic characteristics, particularly a compressible foam as described above, is linked to the foam's processability, that is, its ability to be introduced into the spacer cavity. A foam is chosen that can be compressed in order to be introduced into the spacer cavity, where it conforms to the shape of the cavity while maintaining the same acoustic performance. It should be noted that if a rigid polyurethane foam were used, compressing it would cause it to lose its acoustic properties due to the destruction of its microstructure, because once compressed, it will never regain its original shape.

[0267] The compressibility of the acoustic cavity material is necessary to introduce the foam into such a small space.

[0268] It is important to respect a threshold of rigidity, therefore a specific elastic modulus allowing a compressible foam, but which recovers its acoustic properties once it returns to its initial shape.

Claims

Demands

1. Glazing (10, 20, 30) comprising at least two glazed walls (7, 17, 27) forming a cavity between them, in which the cavity comprises at least one device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) being a perforated plate comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting at least one chamber (2, 12) disposed in the cavity, an absorbing material being present inside the chamber (2, 12), characterized in that at least one said absorbing material present inside the chamber (2, 12) is a compressible porous absorbing material (8), arranged to be, in a first state of introduction, compressed for its introduction into said chamber (2, 12), and, in a second state of service, expanded by conforming to the walls of said chamber (2, 12),said compressible porous absorbent material retaining the same acoustic performance in said first state of introduction and in said second state of service.

2. Glazing (10, 20, 30) according to claim 1, characterized in that said compressible porous absorbing material (8) comprises a polyurethane structure, impregnated with an acrylic-based resin.

3. Glazing (10, 20, 30) according to claim 1 or 2, characterized in that said compressible porous absorbing material (8) has a lower elastic compression modulus than glass wool comprising fibres, and lower than that of closed structure polyurethane foam.

4. Glazing (10, 20, 30) according to claim 3, characterized in that said compressible porous absorbing material (8) has a compressive elastic modulus between 50 kPa and 200 kPa inclusive.

5. Glazing (10, 20, 30) according to any one of claims 1 to 4, characterized in that the plate (3, 11, 23) and the chamber (2, 12) which it delimits are configured to resonate at a low frequency less than or equal to 400 Hz.

6. Glazing (10, 20, 30) according to any one of claims 1 to 5, characterized in that, on the one hand, at least one plate (3, 11, 23) of the device comprising a plurality of perforations (6, 16, 26) arranged periodically, and on the other hand, the chamber (2, 12) that it delimits, are configured to resonate at the mass / spring / mass frequency of the glazing.

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

8. Glazing (10, 20, 30) according to any one of claims 1 to 7, characterized in that the device further comprises desiccating means configured to absorb moisture present in said at least one chamber (2, 12).

9. Glazing (10, 20, 30) according to claim 8, characterized in that the desiccating means comprise internal desiccating means arranged inside said at least one chamber (2, 12), and / or external desiccating means (111, 112, 113, 114, 115, 116) arranged fixedly outside said at least one chamber (2, 12), in contact with the perforated plate of said at least one chamber (2, 12) and arranged so as to leave said perforations free.

10. Glazing (10, 20, 30) according to claim 9, characterized in that the desiccating means comprise internal desiccating means which comprise granules gathered in at least one envelope (70, 80, 90), 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 secondary 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.

11. Glazing (10, 20, 30) according to claim 10, characterized in that said at least one envelope comprises two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber, or three envelopes, of which first two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber and a third envelope (90) arranged substantially centrally between said first two envelopes arranged at the ends.

12. Glazing (10, 20, 30) according to any one of claims 1 to 11, characterized in that said glazing (10, 20, 30) is building glazing, such as building facade, window or door glazing or interior glazing.

13. A glazing 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 adapted for manufacturing glazing according to any one of claims 1 to 12.

14. A method for manufacturing glazing according to any one of claims 1 to 12, comprising a first step (100) of supplying at least two glazed walls, a second step (200) of supplying a device according to claim 13, a third step (300) of arranging the two glazed walls so as to form a cavity between them, and a fourth step (400) of introducing the device into the cavity.

15. A method for manufacturing glazing according to claim 14, characterized in that the second step (200) of supplying a device involves selecting a compressible porous absorbing material (8) arranged to be, in a first state of introduction, compressed for its introduction into said chamber (6, 12), and in a second state of service, relaxed by conforming to the walls of said chamber (2, 12), said compressible porous absorbing material (8) retaining the same acoustic performance in said first state of introduction and in said second state of service.

16. A method for manufacturing a glazing according to claim 15, characterized in that the fourth step (400) of introducing the device into the cavity comprises a compression phase of said compressible porous absorbing material (8) for its introduction in the cavity, followed by a relaxation phase of said compressible porous absorbing material (8) to conform to the internal contours of the cavity.

17. A method for manufacturing a glazing according to claim 16, characterized in that, during the fourth step (400) of introducing the device into the cavity, said compressible porous absorbing material (8) is inserted into the cavity and pressed against the internal contours of the cavity before the introduction of any other thermal or sound insulator or desiccant into the cavity.

18. A method for manufacturing a glazing according to any one of claims 14 to 17, characterized in that said fourth step (400) of introducing said device into said cavity comprises placing said device in said cavity of the glazing, so that the chamber delimited by the perforated plate of the device is in fluidic communication with the cavity of the glazing via the perforations of the plate of the device.

19. A method for manufacturing glazing according to any one of claims 14 to 18, characterized in that said second step (200) of supplying a device provides a device which is a spacing device, and in that said third step (300) of arranging the two glazed walls comprises a phase of fixing the two glazed walls onto the spacing device.

20. A method for manufacturing glazing according to claim 19, characterized in that said spacing device comprises at least one perforated profile (1), and in that the two glazed walls are fixed to the spacing device so that the upper wall (3) of the profile(s) (1) of said spacing device comprising the perforations (6) arranged periodically faces the cavity formed between the glazed walls of the glazing.