SOUNDPROOFING BOX

Abstract

A soundproof enclosure (20) comprising: an outer casing (26) delimiting a chamber (27) and defining a first direction (X) along its longest dimension, the casing (26) having a base (28) in which an air inlet (36) and an air outlet (38) are provided, the air inlet and outlet (36, 38) each having a longest dimension parallel to the first direction (X); and an inner wall (40) comprising acoustic foam, the inner wall (40) extending into the chamber (27) projecting from a zone of the base (28) located between the air inlet (36) and the air outlet (38), the inner wall (40) having a longest dimension parallel to the first direction (X). (See Figure 3 for more details.)

Description

Title of the invention: SOUNDPROOFING BOX Technical field

[0001] The present disclosure relates to the field of cooling systems and in particular systems for limiting the temperature rise in any type of machine. Preferably but not limitingly, the disclosure relates to an electronic device and in particular a digital panel intended for urban display. Prior art

[0002] It is known to cool an electronic device by means of a fan configured to extract hot air therefrom. For example, document WO 02 / 071820 A1 proposes a system in which a fan extracts the air contained in a computer case to propel it in a zig-zag path forming a succession of baffles, the objective of the baffles being to attenuate the noise generated by the fan and by the air flow.

[0003] However, this type of baffle creates pressure losses: the nominal flow that the fan could extract is reduced, sometimes by half, because of the aerodynamic resistance caused by the passage of air through the baffles. To maintain control of the temperature in the computer case without increasing the noise generated, it is necessary to compensate for these pressure losses. This is done by increasing the rotation speed of the fan, and therefore increasing energy consumption, which is detrimental to environmental protection. Summary

[0004] The present disclosure improves the situation by providing a sound attenuation box which offers reduced pressure loss and therefore cooling demonstrating better efficiency. In addition, the present disclosure provides a compact, reliable and easy-to-maintain system.

[0005] A soundproofing box is provided comprising: an envelope delimiting an enclosure and defining a first direction along its largest dimension, the envelope having: a base in which an air inlet and an air outlet are provided, the air inlet and the air outlet each having a direction of largest dimension parallel to the first direction; and an internal wall comprising an acoustic foam, the internal wall extending into the enclosure projecting from an area of ​​the base located between the air inlet and the air outlet, the internal wall having a direction of largest dimension parallel to the first direction.

[0006] This arrangement of the internal wall and the air inlets and outlets constrains the flow of air to travel a path which is such that it becomes possible to obtain a good compromise between good sound attenuation and minimal pressure losses in the box.

[0007] According to another aspect, the envelope comprises: a ceiling, opposite the base; first and second main side walls, opposite and extending from the base to the ceiling; and first and second secondary side walls, opposite and extending from the base to the ceiling.

[0008] Thus, the envelope is presented here as substantially forming a parallelepiped. Other envelope designs are conceivable without necessarily reducing the technical advantages of significant soundproofing and reduced pressure losses.

[0009] According to another aspect, the internal wall has at least one longitudinal end facing and at a distance from one of the secondary side walls of the envelope.

[0010] It may thus be possible to allow the air flow to pass between the casing and the wall at one or both longitudinal ends of the wall. This reduces edge effects which could create pressure losses and avoids obstacles which would potentially be a source of aerodynamic losses in the box.

[0011] According to another aspect, the internal wall has a free distal end, at a distance from the ceiling of the envelope.

[0012] In this variant, the air flow is therefore free to circulate above the internal wall. There is therefore no obstacle to the passage of air and therefore less pressure loss.

[0013] According to another aspect, the distance between the free distal end and the ceiling is between one third and two thirds of the distance separating the base of the ceiling from the envelope.

[0014] This value range is a good compromise to ensure sound attenuation without generating pressure losses: in fact, an internal wall that is too short would have too little effect on sound attenuation and a wall that is too high would limit the possible flow rate above the wall.

[0015] Alternatively, the inner wall may extend completely from the base to the ceiling, without allowing air to circulate above the inner wall.

[0016] According to another aspect, the internal wall comprises a main branch and a secondary branch, the secondary branch being opposite and at a distance from the second secondary side wall.

[0017] This L-shaped configuration can lengthen the path taken by the air and thus reduce noise, by creating pressure losses of an acceptable order of magnitude, the secondary branch remaining at a distance from the envelope.

[0018] According to another aspect, the air inlet is, in the first direction, closer to the secondary branch than is the air outlet.

[0019] According to another aspect, the secondary branch is a first secondary branch, the internal wall having a second secondary branch, opposite and at a distance from the first secondary side wall.

[0020] This U-shaped configuration of the internal wall further increases the air flow that can be evacuated at the two longitudinal ends of the wall while further reducing noise.

[0021] According to another aspect, the box further comprises a canopy covering the main and secondary branches of the internal wall. Optionally, the canopy overhangs the entire air inlet.

[0022] The canopy thus creates a baffle that the air will bypass without pressure loss. The canopy can be substantially parallel to the base or be inclined relative to it.

[0023] According to another aspect, the envelope has a width in a second direction and the air inlet and outlet are spaced from the internal wall by less than 10% of the width of the envelope.

[0024] The proximity between the air inlet and outlet and the internal wall ensures good sound attenuation, the air flow flowing close to acoustically absorbent elements.

[0025] According to another aspect, the air inlet and outlet have a respective width in the second direction which is between 20% and 40% of the width of the envelope. Widths that are too narrow would hinder the proper flow of air and widths that are too large would reduce the directivity of the flow, causing pressure losses.

[0026] According to another aspect, the inner wall has a length in the first direction, the air inlet and outlet having a respective length in the first direction which is between 60% and 80% of the length of the inner wall. Lengths that are too short would hinder the proper flow of air and lengths that are too long would reduce sound attenuation, the risk being of diverting the flow away from the absorbent elements of the inner wall.

[0027] According to another aspect, the envelope has a width in a second direction and a height in a third direction, the width being between 1.70 and 3 times the height. Tests have in fact shown that, all other things being equal, this form factor of the box makes it possible to lower the temperature by one degree and therefore to further improve the cooling efficiency.

[0028] According to another aspect, the air inlet is centered on the base. This centering also means that the air outlet is closer to one of the main side walls than are the inner wall or the air inlet. This configuration with a centered inlet and an off-centered outlet ensures good evacuation of the air flow outside the box and therefore little flow loss.

[0029] According to another aspect, the main and secondary side walls as well as the ceilings are covered with acoustic foam. This foam further improves noise reduction.

[0030] According to another aspect, the air inlet is a single orifice and the air outlet is formed by a set of perforations forming a single grille. The grille further improves noise attenuation and limits the penetration of foreign bodies into the box.

[0031] The invention also relates to a digital panel comprising: a structure incorporating at least one digital screen and a ventilation device configured to extract hot air from the structure; and a soundproofing box according to one of the embodiments mentioned above, the air inlet of which is in fluid connection with the ventilation device.

[0032] According to another aspect, the soundproofing box is arranged above the structure.

[0033] According to another aspect, the air outlet opens laterally towards the outside at the junction between the soundproofing box and the structure.

[0034] According to another aspect, the panel has two main faces and the air outlet opens outwards on only one of the two main faces.

[0035] According to another aspect, the fluid connection between the ventilation device and the soundproofing box is provided by an inlet channel whose section is greater than or equal to the section of the air inlet. The channel may have a structural function supporting the box. Optionally, in the case of equality, continuity in the section of the flow between the ventilation device and the soundproofing box limits the pressure losses.

[0036] The invention also relates to a shelter for travelers comprising a panel according to one of the embodiments set out above, the panel forming a wall delimiting a reception space for travelers.

[0037] According to another aspect, the air outlet opens outside the passenger reception area.

[0038] The features set out in the preceding paragraphs may, optionally, be implemented independently of one another or in combination with one another. Brief description of the drawings

[0039] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which:

[0040] [Fig-1] shows a digital panel.

[0041] [Fig.2] illustrates a sectional view of a soundproofing box.

[0042] [Fig.3] represents an isometric view of a soundproofing box.

[0043] [Fig.4] shows a sectional view of a soundproofing box.

[0044] [Fig.5] illustrates a sectional view of a soundproofing box.

[0045] [Fig.6] represents a sectional view of a soundproofing box.

[0046] [Fig.7] shows a sectional view of a soundproofing box.

[0047] [Fig.8] illustrates an isometric view of a soundproofing box.

[0048] [Fig.9] represents a sectional view of a soundproofing box.

[0049] [Fig. 10] shows a shelter for travelers. Description of the embodiments

[0050] In the figures described below, the invention is shown schematically. Certain parts are not shown to facilitate reading of the figures, such as for example the fixing elements (screw elements, welds, etc.) or the control elements (sensors, wiring, etc.). The figures are not necessarily shown to scale and certain dimensions may be exaggerated to highlight more clearly the various principles of the invention.

[0051] Unless otherwise indicated, the terms used in the description take their usual definition: the length of a given element is its largest dimension; the width is a dimension smaller than the length and the thickness is the smallest dimension.

[0052] Each detail discussed in one of the figures can be combined with every other detail of another figure unless explicitly stated otherwise.

[0053] [Fig. 1] shows a digital panel 1 which may be intended for advertising and / or urban use. The panel 1 comprises a structure 2 provided with a wall 4 which is at least partially transparent and which makes it possible to make visible the information displayed on a display screen 6 incorporated in the structure 2. An opposite wall 8 of the structure 2 may also be at least partially transparent and the structure 2 may incorporate a second display screen (denoted 7 in [Fig. 2]). The structure 2 may have dimensions such that the display screen 6 which it receives may have a diagonal of at least 70 inches. The structure 2 also incorporates any hardware or software necessary for controlling the display screens (power supply, modem, brightness sensors, etc.).

[0054] The structure 2 comprises two side walls 10, 12. The structure 2 may be suspended by fixing elements engaging one or the other of the side walls 10, 12. Alternatively or in combination, the structure 2 may be supported by a base 14.

[0055] To avoid any overheating, it is necessary to evacuate the heat released by the display screen 6 from the structure 2. Unlike a home computer which may have numerous ventilation grilles, a digital panel 1 placed outdoors and therefore exposed to bad weather cannot be equipped with such ventilation grilles. Also, the digital panel 1 may be exposed to high heat which comes amplify the cooling requirements. Thus, a ventilation device (e.g., a ventilation ramp) may be provided to extract the hot air through a cap or box 20.

[0056] In the description which follows, the box 20 is described as being arranged above the structure 2. The terms “above”, “below”, or “lateral” will be used in accordance with this direction of mounting of the box 20. It is understood that this arrangement of the box 20 is only a particular choice and that the box 20 may alternatively be arranged on a side wall 10, 12 or in place of the base 14, the terms “above”, “below”, or “lateral” being adapted according to these configurations.

[0057] The box 20 can cover the entire structure 2. In the example illustrated, the box 20 thus has a greater dimension (length) in a first direction, noted X, and which corresponds to the width of the digital panel 1. The box 20 has a width in a second direction, noted Y, which corresponds to the thickness of the digital panel 1. The box 20 has a height in a third direction, noted Z, which corresponds to the direction according to the height of the digital panel 1. The direction Z can be the vertical of the place.

[0058] The box 20 may be at least four times longer than it is wide and / or at least one and a half times wider than it is high.

[0059] The box 20 may be provided with elements having soundproofing properties. Also, in addition to the heat evacuation and soundproofing functions, the box 20 may have additional functions (lighting, solar energy capture, etc.).

[0060] The box 20 is illustrated here as a parallelepiped but other variants are also possible without fundamentally deteriorating the technical advantages obtained.

[0061] The box 20 may be directly arranged in contact with the structure. Alternatively, and as illustrated, the box 20 is separated from the structure 2 by an inlet channel 22, arranged above the ventilation device (24 in [Fig. 2]) and opening into an air inlet opening of the box 20. The box 20 and possibly the channel 22 may form an assembly fixed to the structure by means of end tabs which are fixed to the side walls 10, 12.

[0062] It is understood that the digital panel 1 of [Fig.l] is only a particular application of the invention, the soundproofing box 20 being able to present the same technical advantages when it is attached to other devices (for example computer devices, hi-fi, household appliances, or industrial machines).

[0063] [Fig.2] shows a sectional view along the YZ plane of the upper part of panel 1.

[0064] The ventilation device 24 generates an air flow F. The ventilation device can be arranged above the display screens 6, 7 and centrally in the structure 2. The ventilation device 24 may comprise a ramp of 6 fans with a total nominal power of approximately 400 W. The air from the structure 2 passes through the channel 22 and the box 20 in the manner illustrated in [Fig. 2]. To allow the admission of air into the structure 2, a filtration box may be arranged opposite the ventilation device 24 (i.e. below the structure in this example).

[0065] The box 20 comprises a mainly closed envelope 26 which defines an enclosure 27. The envelope is here illustrated as parallelepiped, with a base 28, a ceiling 30, a first main side wall 32 and a second main side wall 33, a first secondary side wall (marked 34 in [Fig. 3] and not visible in the section of [Fig. 2]) and a second secondary side wall 35. Other designs are naturally conceivable for the envelope 26, for example with side walls which are not parallel two by two, or walls which are not flat: the main side walls 32 and 33 can in particular adopt a semi-circular profile seen in this section YZ.

[0066] The box 20 may be formed from a mechanically welded assembly and / or be formed by assembling several sheets folded appropriately. In one example, the base 28 may be made up of several sheet metal elements aligned in the same plane. For example, one side of the channel (for example on the right) and a portion of the base 28 (on the right) may be formed from the same sheet metal, folded, and the other side (on the left) of the channel may be formed from the same sheet metal as the left portion of the base 28. In a variant, the ceiling 30 and the two main side walls 32, 33 are formed from a single sheet metal, folded into a U. The thickness of the sheets forming the envelope may be between 0.5 mm and 5 mm. Those skilled in the art will understand that other arrangements are possible without considerably impacting the technical benefits obtained by these examples.

[0067] The air flow F enters the enclosure 27 through an air inlet 36 provided in the base 28. The air flow F leaves the enclosure through an air outlet 38 also provided in the base 28. The air inlet and / or outlet 36, 38 may be formed of one or more orifices. The trajectory of the air flow F is constrained by the presence of an internal wall 40 which is supported by the base 28 in a zone 37 located between the inlet 36 and the outlet 38. The internal wall 40 may extend mainly perpendicular to the base 28, that is to say forming with the base an angle of between 80 and 100°.

[0068] The internal wall 40 extends over a major portion of the length of the box 20, in particular at least 70% of the length of the box 20.

[0069] The internal wall 40 may have a proximal end 41 in contact with the zone 37 and a distal end 42 at a distance from the base 28. The distal end 42 may be free, that is to say at a distance from the ceiling 30, or alternatively be in contact with the ceiling 30.

[0070] The inner wall 40 may be made of acoustic foam or at least be made of it. partially covered. A foam of the open-cell flexible melamine foam type may be suitable. A foam thickness of between 5 and 20 mm may be chosen. At least one of the walls 28, 30, 32, 33, 34, 35 may also be covered with an acoustic foam of this type. The foam may be held to the walls by clips which engage in holes provided on the walls.

[0071] [Fig.2] finally illustrates the height H and the width 1 of the box 30, which correspond (apart from the thicknesses of the walls) to the height and the width of the enclosure 27, or again, to the distance between the base 28 and the ceiling 30, and to the distance between the side walls 32, 33, respectively.

[0072] The values ​​of H and 1 can be adapted to the size of the digital panel 1 or any other application envisaged for the box 20. For example, the height H can be between 100 and 180 mm, more preferably between 120 and 160 mm. The width 1 can be between 200 and 300 mm, more precisely between 230 and 260 mm.

[0073] [Fig. 3] shows an isometric and partially transparent view of the box 20 of [Fig. 2]. In particular, the various walls 28, 30, 32, 33, 34, 35 of the casing 26 can be seen, as well as the air inlet and outlet 36, 38.

[0074] [Fig. 3] also highlights the “parallelism” between the inlet 36 and the outlet 38 and the internal wall 40. By “parallelism”, it should be understood that the largest dimension of the inlet / outlet 36, 38 and of the wall 40 is parallel to the X axis, without however limiting the shape or size that these elements can adopt: the air inlets / outlets are presented as rectangles but their shapes can be adapted and can in particular have rounded ends at their ends.

[0075] [Fig.4] is a sectional view of the box 20 of [Fig.3] in an XY plane. This view makes it possible to annotate the different dimensions of the air inlet and outlet and of the internal wall 40.

[0076] The length of the internal wall 40 is denoted L40, it can be at least 70% of the length L of the box 20. The air inlet and outlet 36, 38 have a respective length denoted L36 and L38. These lengths can be between 60% and 80% of the length L40. This range of values ​​makes it possible to avoid edge effects by guaranteeing that the entire incoming / outgoing flow “sees” the internal wall. Lengths for the air inlet and outlet that are too short would hinder the proper flow of air and lengths that are too long would reduce sound attenuation, the flow moving away from the sound-absorbing elements of the internal wall.

[0077] The length L of the box 20 may be between 1000 and 1800 mm, preferably between 1200 and 1400 mm.

[0078] The width of the air inlet and outlet, noted 136 and 138, can be between 20 and 30% of the width 1 of the box 20.

[0079] The air inlets and outlets 36, 38 are adjacent to the internal wall 40. Thus, the distances between the air inlets and outlets 36, 38 and the internal wall, denoted e36 and e38, are less than 10% of the width 1 of the box 20.

[0080] The air inlets and outlets 36, 38 may have the same width and / or the same length. They may be centered along the X axis relative to the internal wall 40.

[0081] [Fig.4] also shows that the internal wall 40 is at a distance from the secondary side walls 34, 35. Thus, the distances between the longitudinal ends 44, 45 of the internal wall 40 and the secondary side walls 34, 35, denoted D44 and D45, can be between 5% and 20% of the length L of the box 20.

[0082] [Fig.5] shows a section in a YZ plane highlighting the distance D42 between the free distal end 42 of the internal wall 40 and the ceiling 30. In a variant, the distance D42 is between a quarter and half of the height H of the box 20. In an alternative, the internal wall 40 is in contact with the ceiling 30 (D42 is therefore zero).

[0083] If figures 2 to 5 show a rectilinear internal wall 40, other configurations are possible. Thus, [Fig.6] shows, in top view, a variant in which the internal wall 40 has, in top view, an L-shaped profile, formed of a main branch 46 and a secondary branch 48.

[0084] The secondary branch 48 can form with the main branch 46 an angle α of between 60 and 120°. In an advantageous variant, the angle α is approximately 90°.

[0085] In this variant, the internal wall 40 can extend from the base 28 to the ceiling 30.

[0086] In this example, the air flow bypasses the internal wall 40 by passing between the secondary branch 48 and the casing. The secondary branch 48 is distant from the main side wall 33 by a distance D48 which may be between 20% and 40% of the width 1 of the box 20.

[0087] The secondary branch 48 may be closer to the main sidewall 33 than is the air inlet 36 in order to force any air particles to have a trajectory that involves a negative Y-shaped movement, before bypassing the secondary branch 48.

[0088] The longitudinal end 45 of the main branch 46 may be distant from the secondary side wall 35 in the same way as that described above in relation to [Fig.4],

[0089] The main branch 46 may be in contact with the secondary side wall 34.

[0090] In the illustrated variant, the air inlet and outlet 36, 38 are offset along the X axis. For example, the outlet 38 may be at a distance D38 from the secondary branch 48 which is greater, in particular at least 3 times greater than the distance D36 which separates the secondary branch 48 from the inlet 36.

[0091] The outlet 38 may be adjacent to the secondary side wall 34, that is to say it is less than 5% of the length L of the box.

[0092] [Fig.7] shows another variant, in which the internal wall 40 has a U-shaped profile, that is to say with a main branch 46 and this time two secondary branches 48, 50. The internal wall 40 can be centered along X relative to the box 40. The angles α and β that the secondary branches form with the main branch can be equal and / or can be between 60 and 120°. Preferably, these angles are right angles.

[0093] The air inlets and outlets 36, 38 may be centered along X relative to the internal wall 40. In a variant, the air inlets and outlets 36, 38 are adjacent to the secondary branches 48, 50, i.e. they are less than 5% of the length L of the box apart.

[0094] The same positioning (distance to the main and secondary side walls) as that mentioned for the secondary branch 48 of [Fig.6] can be valid for the secondary branches 48 and 50 of [Fig.7].

[0095] In this example also, the internal wall 40 may extend from the base 28 to the ceiling 30 or alternatively be distant therefrom in the manner discussed in [Fig.5].

[0096] Figures 7 to 9 show the fixing lugs of the box 20 to the structure 2. These lugs can pass through the base 20 between the longitudinal ends 48, 50 of the internal wall 40 and the secondary walls of the box, they can be in contact with the ceiling 30. It is understood that other means of fixing the box 20 to the structure 2 are conceivable without considerably affecting the technical benefits obtained by the present disclosure.

[0097] [Fig.8] illustrates a variation based on the embodiment of [Fig.7], the difference being that a canopy 52 forces the airflow to have a negative Y trajectory in order to bypass the inner wall 40.

[0098] The canopy 52 may extend over all or part of the main branch 46. In the example illustrated, the canopy 52 covers the main branch 46 and the secondary branches 48, 50.

[0099] Optionally, the canopy 52 completely overhangs the air inlet 36. In other words, seen from above, the air inlet 36 is completely hidden by the canopy 52.

[0100] The canopy 52, like the main branches 46 and secondary branches 48, 50, can be covered or formed from acoustic foam.

[0101] The canopy 52 may be substantially parallel to the base 28. Alternatively, it may form an angle of between -10° and +10° relative to the base 28.

[0102] The awning 52 can adopt the altitude of the end 42 described in [Fig.5].

[0103] [Fig.9] shows a bottom view of the box 20 according to an embodiment in which the outlet 38 is formed of a grid 38 composed of a plurality of perforations 39. The perforations 39 may be composed of oblong holes arranged in a staggered pattern.

[0104] Comparative tests were carried out to test the different variants presented above. A box with several baffles served as a reference. The following were measured, at an ambient temperature of 40°C, with the fans at 100% of their nominal rotation: the temperature inside structure 2 of panel 1; the flow losses (ratio between the flow leaving the box and the nominal flow expected by the rotation of the fans); and the sound attenuation between the interior noise and the noise measured at a distance of 3 meters from the panel.

[0105] The reference box has a sound attenuation of -6dB, a flow loss of 50% and a maximum temperature inside the structure of 89°C.

[0106] The examples in Figures 2 to 5 with a linear internal wall showed an outgoing flow rate of 98% of the nominal flow rate and a maximum temperature of 80°C. These examples are therefore considerably more efficient for heat extraction than the reference design, in addition to having a simple and therefore economical design. However, they are less efficient in terms of sound attenuation.

[0107] The example in [Fig.6] with an L-shaped internal wall allows an outgoing flow rate of 62% and a maximum temperature in the structure of 85°C. This solution is therefore slightly less energy efficient but allows better sound attenuation compared to the linear internal wall.

[0108] Finally, the embodiment of figures 7 or 8 allows an outgoing flow rate of 94% with a maximum temperature of 82°C and a sound attenuation of -6dB.

[0109] When the shape factor (1 / H) of the box is approximately 1.75, it has been observed that, all things being equal, the maximum temperature of the structure is lowered by one degree, for example to 81°C for the example in [Fig.8], without altering the outgoing flow rate or the sound attenuation.

[0110] Thus, each of the examples offers an improvement over the reference design.

[0111] [Fig. 10] shows a travel shelter 100. The shelter 100 may comprise several walls 102, 104 that are at least partially transparent. A digital panel 1 may act as a wall for the shelter 100. A roof 106 may, with the walls 102, 104 and with the digital panel 1, delimit a space 108 that can accommodate travelers (not shown). The reception space 108 may be provided with a bench 110.

[0112] The digital panel 1 may be in accordance with one of the examples discussed above and / or may include one of the sound-absorbing boxes detailed above.

[0113] The hot air can be evacuated from the side of a face 4 of the digital panel 1 opposite the reception space 108.

[0114] Alternatively, the hot air can be discharged into the interior of the reception space 108.

[0115] Also, the box 20 mounted above the structure of the digital panel 1 can be removable and can adopt either position, blowing hot air outside or inside the reception space 108. List of reference signs

[0116] 1: digital panel 2: structure 4, 8: transparent wall 6, 7: display screen 10, 12: side walls of structure 2 14: base 20: box 22: input channel 24: ventilation device 26: envelope 27: pregnant 28: base of the envelope 26 30: envelope ceiling 26 32, 33: main side walls of the envelope 26 34, 35: secondary side walls of the envelope 26 36: air inlet 37: area of ​​the base 28 on which the internal wall 40 is attached 38: air outlet 39: perforations forming an air outlet grille 38 40: internal wall 41: proximal end of the internal wall 40 42: free distal end of the internal wall 40 44, 45: longitudinal ends of the internal wall 40 46: main branch of the internal wall 40 48, 50: secondary branches of the internal wall 40 52: awning F: air flow H: height of the box 1: width of the box L: length of the box D36, D38: distance (in X) between the air inlet and outlet and the secondary branch e36, e38: distances (in Y) between the air inlet and outlet and the internal wall 136,138: width of the air inlet and outlet L36, L38, L40: length of air inlet and outlet, and length of internal wall D42, D44, D45, D48: distance of elements 42, 44, 45 and 48 from the envelope a, [3: angles formed between the secondary branches 48, 50 and the main branch 46

Claims

Claims

1. Soundproofing box (20) comprising: - an envelope (26) delimiting an enclosure (27) and defining a first direction (X) along its largest dimension (L), the envelope (26) having a base (28) in which an air inlet (36) and an air outlet (38) are provided, the air inlet (36) and the air outlet (38) each having a largest dimension direction (L36, L38) parallel to the first direction (X); and - an internal wall (40) comprising an acoustic foam, the internal wall (40) extending into the enclosure (27) projecting from a zone (37) of the base (28) located between the air inlet (36) and the air outlet (38), the internal wall (40) having a largest dimension direction (L40) parallel to the first direction (X).

2. A soundproofing enclosure (20) according to claim 1, wherein the enclosure (26) comprises: a. a ceiling (30), opposite the base (28); b. first and second main side walls (32, 33), opposite and extending from the base (28) to the ceiling (30); and c. first and second secondary side walls (34, 35), opposite and extending from the base (28) to the ceiling (30).

3. Soundproofing box (20) according to claim 2, in which the internal wall (40) has at least one longitudinal end (44, 45) opposite and at a distance from one of the secondary side walls (34, 35) of the envelope.

4. Soundproofing box (20) according to one of claims 2 or 3, in which the internal wall (40) has a free distal end (42), at a distance from the ceiling (30) of the envelope (26).

5. Soundproofing box (20) according to the preceding claim, in which the distance (D42) between the free distal end (42) and the ceiling (30) is between one third and two thirds of the distance (H) separating the base (28) of the ceiling (30) of the envelope (26).

6. Soundproofing box (20) according to one of claims 2 to 5, in which the internal wall (40) comprises a main branch (46) and a secondary branch (48, 50), the secondary branch (48, 50) being opposite and at a distance from the second secondary side wall (35).

7. Soundproofing box (20) according to the preceding claim, in which the air inlet (36) is, in the first direction, closer to the secondary branch (48, 50) than is the air outlet (38).

8. Soundproofing box (20) according to one of claims 6 or 7, in which the secondary branch (48, 50) is a first secondary branch (48), the internal wall (40) having a second secondary branch (50), opposite and at a distance from the first secondary side wall (34).

9. Soundproofing box (20) according to the preceding claim, further comprising a canopy (52) covering the main (46) and secondary (48, 50) branches of the internal wall (40).

10. Soundproofing box (20) according to the preceding claim, in which the canopy (52) overhangs the entirety of the air inlet (36).

11. Soundproofing box (20) according to any one of the preceding claims, in which the envelope (26) has a width (1) in a second direction (Y) and the air inlet and outlet (36, 38) are spaced from the internal wall (40) by less than 10% of the width (1) of the envelope (26).

12. Soundproofing box (20) according to the preceding claim, in which the air inlet and outlet (36, 38) have a respective width (136, 138) in the second direction (Y) which is between 20% and 40% of the width (1) of the envelope (26).

13. Soundproofing box (20) according to any one of the preceding claims, in which the internal wall (40) has a length (L40) in the first direction (X), the air inlet and outlet (36, 38) having a respective length (L36, L38) in the first direction (X) which is between 60% and 80% of the length (L40) of the internal wall (40).

14. Soundproofing box (20) according to any one of the preceding claims, in which the envelope (26) has a width (1) in a second direction (Y) and a height (H) in a third direction (Z), the width (1) being between 1.70 and 3 times the height (H).

15. A soundproofing box (20) according to any one of the claims previous, in which the air inlet (36) is centered on the base (28).

16. Soundproofing box (20) according to any one of the preceding claims, in which the air inlet (36) is a single orifice and the air outlet (38) is formed of a set of perforations (39) forming a single grid (38).

17. Digital panel (1) comprising: - a structure (2) incorporating at least one digital screen (6, 7) and a ventilation device (24) configured to extract hot air from the structure (2); and - a soundproofing box (20) according to one of the preceding claims, the air inlet (36) of which is in fluid connection with the ventilation device (24).

18. Digital panel (1) according to claim 17, wherein the soundproofing box (20) is arranged above the structure (2).

19. Digital panel (1) according to claim 17 or 18, in which the air outlet (38) opens laterally towards the outside at the junction between the soundproofing box (20) and the structure (2).

20. Digital panel (1) according to one of claims 17 to 19, in which the panel (1) has two main faces (4, 8) and the air outlet (38) opens outwards on only one of the two main faces.

21. Digital panel (1) according to one of claims 17 to 20, in which the fluid connection between the ventilation device (24) and the soundproofing box (20) is provided by an inlet channel (22) whose section is greater than or equal to the section of the air inlet (36).

22. Shelter (100) for travelers comprising a panel (1) according to one of claims 17 to 21 forming a wall delimiting a reception space (108) for travelers.

23. Shelter (100) for travelers according to claim 22 in which the digital panel (1) is in accordance with claim 20, the air outlet (38) opening outside the reception space (108) for travelers.

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