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] This disclosure relates to the field of cooling systems, and in particular systems for limiting temperature rise in all types of machines. Preferably, but not exclusively, the disclosure relates to an electronic device, and in particular a digital display panel for urban advertising. Previous technique

[0002] It is known to cool an electronic device by means of a fan configured to extract hot air from it. For example, document WO 02 / 071820 A1 proposes a system in which a fan extracts air from a computer case and propels it through a zigzag path forming a series of baffles, the purpose of the baffles being to reduce the noise generated by the fan and the airflow.

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

[0004] The present disclosure improves the situation by proposing a sound attenuation enclosure that offers reduced pressure drop and therefore improved cooling efficiency. Furthermore, the present disclosure proposes a compact, reliable, and easy-to-maintain system.

[0005] A soundproof enclosure is proposed comprising: an envelope delimiting a chamber 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 chamber 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 inlet and outlet forces the airflow to follow a path which makes it 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; a first and a second main side walls, opposite and extending from the base to the ceiling; and a first and a second secondary side walls, opposite and extending from the base to the ceiling.

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

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

[0010] It may thus be possible to allow the airflow between the envelope and the wall at one or both longitudinal ends of the wall. This reduces edge effects that could create pressure losses and avoids obstacles that could potentially cause aerodynamic losses in the box.

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

[0012] In this variant, the airflow is therefore free to circulate above the inner wall. There is therefore no obstacle to the passage of air and thus 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 range of values ​​is a good compromise to ensure sound attenuation without generating pressure losses: indeed, 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 can 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 lateral wall.

[0017] This L-shaped configuration can lengthen the path taken by the air and thus attenuate the noise, by creating pressure losses in 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 presenting a second secondary branch, opposite and at a distance from the first secondary lateral wall.

[0020] This U-shaped configuration of the inner wall further increases the airflow that can be evacuated at both 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 arms of the inner 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 inclined relative to it.

[0023] According to another aspect, the envelope has a width along a second direction and the air inlets and outlets are less than 10% of the width of the envelope from the inner wall.

[0024] The proximity between the air inlet and outlet and the internal wall ensures good sound attenuation, with the airflow passing close to acoustically absorbing elements.

[0025] According to another aspect, the air inlets and outlets have a respective width along the second direction that is between 20% and 40% of the envelope width. Widths that are too narrow would impede proper airflow, and widths that are too wide would reduce the flow directivity, resulting in pressure losses.

[0026] According to another aspect, the inner wall has a length along the first direction, with the air inlets and outlets having respective lengths along the first direction that are between 60% and 80% of the length of the inner wall. Lengths that are too short would impede proper airflow, and lengths that are too long would reduce sound attenuation, with the risk of diverting the airflow away from the absorbing elements of the inner wall.

[0027] According to another aspect, the casing has a width along a second direction and a height along a third direction, the width being between 1.70 and 3 times the height. Tests have indeed shown that, all other things being equal, this form factor of the casing makes it possible to lower the temperature by one degree and thus 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 is the inner wall or the air inlet. This configuration with an inlet A centered and an off-center outlet ensures good evacuation of the airflow outside the box and therefore little loss of flow.

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

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

[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 soundproof box according to one of the embodiments mentioned above, the air inlet of which is in fluidic connection with the ventilation device.

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

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

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

[0035] According to another aspect, the fluidic connection between the ventilation device and the soundproof enclosure is ensured by an inlet duct whose cross-section is greater than or equal to the cross-section of the air inlet. The duct may have a structural function supporting the enclosure. Optionally, in the case of equality, continuity in the cross-section of the flow between the ventilation device and the soundproof enclosure limits pressure losses.

[0036] The invention also relates to a shelter for travellers comprising a panel according to one of the embodiments described above, the panel forming a wall delimiting a reception area for travellers.

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

[0038] The features described in the preceding paragraphs can optionally be implemented independently of each other or in combination with each other. Brief description of the drawings

[0039] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analysis of the accompanying drawings, on which:

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

[0041] [Fig.2] illustrates a cross-sectional view of a soundproof box.

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

[0043] [Fig.4] shows a cross-sectional view of a soundproof box.

[0044] [Fig.5] illustrates a cross-sectional view of a soundproof box.

[0045] [Fig.6] represents a cross-sectional view of a soundproof box.

[0046] [Fig.7] shows a cross-sectional view of a soundproof box.

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

[0048] [Fig.9] represents a cross-sectional view of a soundproof box.

[0049] [Fig. 10] shows a shelter for travellers. Description of the implementation methods

[0050] In the figures described below, the invention is presented schematically. Certain parts are not shown to facilitate reading the figures, such as fastening elements (screws, welds, etc.) or control elements (sensors, wiring, etc.). The figures are not necessarily drawn to scale, and certain dimensions may be exaggerated to more clearly highlight 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] Every detail discussed in one of the figures can be combined with every other detail in another figure unless the contrary is explicitly mentioned.

[0053] Figure 1 shows a digital sign 1 that can be used for advertising and / or urban purposes. The sign 1 comprises a structure 2 with a wall 4 that is at least partially transparent and allows the information displayed on a display screen 6 incorporated into the structure 2 to be visible. An opposite wall 8 of the structure 2 can also be at least partially transparent, and the structure 2 can incorporate a second display screen (labeled 7 in Figure 2). The structure 2 can have dimensions such that the display screen 6 it accommodates has a diagonal of at least 70 inches. The structure 2 also incorporates all hardware and software necessary for controlling the display screens (power supply, modem, light sensors, etc.).

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

[0055] To prevent overheating, it is necessary to dissipate the heat emitted by the display screen 6 from the structure 2. Unlike a home computer While a digital sign 1, located outdoors and therefore exposed to the elements, may have numerous ventilation grilles, it cannot be equipped with such grilles. Furthermore, the digital sign 1 may be exposed to high temperatures, which will increase its cooling requirements. Therefore, a ventilation system (e.g., a ventilation duct) may be installed to extract the hot air through a vent or box 20.

[0056] In the following description, 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 mounting direction 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 lateral wall 10, 12 or in place of the base 14, the terms "above", "below", or "lateral" being to be adapted according to these configurations.

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

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

[0059] The enclosure 20 can be fitted with elements having soundproofing properties. Also, in addition to the heat dissipation and soundproofing functions, the enclosure 20 can have additional functions (lighting, solar energy harvesting, etc.).

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

[0061] The casing 20 can be placed directly in contact with the structure. Alternatively, and as illustrated, the casing 20 is separated from the structure 2 by an inlet channel 22, located above the ventilation device (24 in [Fig.2]) and opening into an air inlet of the casing 20. The casing 20 and optionally the channel 22 can 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.1] is only one particular application of the invention, the soundproof box 20 being able to present the same technical advantages when attached to other devices (for example computer devices, hi-fi, household appliances, or industrial machines).

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

[0064] The ventilation device 24 generates an airflow F. The ventilation device can be positioned above the display screens 6, 7 and centrally within the structure 2. The ventilation device 24 may include an array of 6 fans with a total rated power of approximately 400 W. Air from the structure 2 passes through the channel 22 and the box 20 as illustrated in [Fig. 2]. To allow air to enter the structure 2, a filter box can be positioned opposite the ventilation device 24 (i.e., below the structure in this example).

[0065] The enclosure 20 comprises a mainly closed casing 26 which defines a chamber 27. The casing is illustrated here as parallelepiped, with a base 28, a roof 30, a first main side wall 32 and a second main side wall 33, a first secondary side wall (noted 34 on [Fig.3] and not visible on the section of [Fig.2]) and a second secondary side wall 35. Other designs are naturally conceivable for the casing 26, for example with side walls which are not parallel in pairs, 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 casing 20 can be formed from a welded assembly and / or by assembling several appropriately bent sheets of metal. In one example, the base 28 can be made of several sheet metal elements aligned in the same plane. For example, one side of the channel (e.g., the right) and part of the base 28 (on the right) can be formed from the same bent sheet metal, and the other side (on the left) of the channel can be formed from the same sheet metal as the left part of the base 28. In another variant, the ceiling 30 and the two main side walls 32, 33 are formed from a single sheet of metal, bent into a U-shape. The thickness of the sheets forming the casing can be between 0.5 mm and 5 mm. Those skilled in the art will understand that other arrangements are possible without significantly impacting the technical benefits obtained from these examples.

[0067] The airflow F enters the enclosure 27 through an air inlet 36 provided in the base 28. The airflow F exits 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 path of the airflow 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 primarily perpendicularly to the base 28, that is to say, forming an angle with the base of between 80 and 100°.

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

[0069] The inner wall 40 can have a proximal end 41 in contact with the area 37 and a distal end 42 away from the base 28. The distal end 42 can be free, i.e. away 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 partially covered with it. A flexible, open-cell melamine foam 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 this type of acoustic foam. The foam may be held to the walls by clips that engage in holes provided in the walls.

[0071] Fig. 2 finally illustrates the height H and the width 1 of the box 30, which correspond (to the thicknesses of the walls) to the height and width of the enclosure 27, or 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 enclosure 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 envelope 26, as well as the air inlet and outlet 36, 38, can be seen.

[0074] Fig. 3 also highlights the "parallelism" between the inlet 36 and 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 inlet / outlet are presented as rectangles but their shapes can be adapted and can in particular have rounded ends.

[0075] Fig. 4 is a cross-sectional view of the casing 20 of Fig. 3 in an XY plane. This view allows the various dimensions of the air inlet and outlet and of the internal wall 40 to be annotated.

[0076] The length of the inner wall 40 is denoted L40; it can be at least 70% of the length L of the enclosure 20. The air inlets and outlets 36 and 38 have respective lengths denoted L36 and L38. These lengths can be between 60% and 80% of the length L40. This range of values ​​helps avoid edge effects by ensuring that all the incoming / outgoing airflow "sees" the inner wall. Inlet and outlet lengths that are too short would impede proper airflow, and lengths that are too long would reduce sound attenuation, as the airflow would be diverted away from the acoustic absorbing elements of the inner wall.

[0077] The length L of the box 20 can 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 inlet and outlet 36, 38 are adjacent to the inner wall 40. Thus, the distances between the air inlet and outlet 36, 38 and the inner wall, denoted e36 and e38, are less than 10% of the width 1 of the box 20.

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

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

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

[0083] While Figures 2 to 5 show a straight 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 an angle α with the main branch 46 of between 60 and 120°. In an advantageous embodiment, 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 airflow bypasses the inner wall 40 by passing between the secondary branch 48 and the casing. The secondary branch 48 is located at a distance D48 from the main side wall 33, which can be between 20% and 40% of the width 1 of the casing 20.

[0087] The secondary branch 48 can be closer to the main side wall 33 than is the air inlet 36 in order to force any air particle to have a trajectory which involves a negative Y-shaped movement, before going around the secondary branch 48.

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

[0089] The main branch 46 can 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 entrance 36.

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

[0092] Figure 7 shows another variant, in which the internal wall 40 has a U-shaped profile, i.e., with a main branch 46 and this time two secondary branches 48, 50. The internal wall 40 can be centered along X with respect 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 inlet and outlet 36, 38 can be centered along X with respect to the internal wall 40. In one embodiment, the air inlet and outlet 36, 38 are adjacent to the secondary branches 48, 50, that is to say they are less than 5% of the length L of the box away from them.

[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 too, the internal wall 40 can extend from the base 28 to the ceiling 30 or alternatively be distant from it 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 inner 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 significantly affecting the technical benefits obtained by the present disclosure.

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

[0098] The canopy 52 can extend over all or part of the main branch 46. In the illustrated example, 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, viewed 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 with acoustic foam.

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

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

[0103] Figure 9 shows a bottom view of the box 20 according to one 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. Under an ambient temperature of 40°C, with the fans at 100% of their nominal rotation, the following were measured: the temperature inside structure 2 of panel 1; the flow losses (ratio between the flow exiting the box and the nominal flow expected by the rotation of the fans); and the sound attenuation between the internal noise and the noise measured at a distance of 3 meters from the panel.

[0105] The reference enclosure 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 outflow rate of 98% of the nominal flow rate and a maximum temperature of 80°C. These examples are therefore considerably more efficient at heat extraction than the reference design, in addition to being simple and therefore economical. However, they are less effective in terms of noise attenuation.

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

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

[0109] When the form factor (1 / H) of the box is about 1.75, it has been observed that, all other things being equal, the maximum temperature of the structure is lowered by one degree, for example to 81°C for the example of [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] Figure 10 shows a passenger shelter 100. The shelter 100 may include several walls 102, 104, at least partially transparent. A digital panel 1 may serve as a wall for the shelter 100. A roof 106, together with the walls 102, 104 and the digital panel 1, may delimit a space 108 for accommodating passengers (not shown). The seating area 108 may be furnished with a bench 110.

[0112] The digital panel 1 may conform to one of the examples discussed above and / or may include one of the soundproofing boxes detailed above.

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

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

[0115] Also, the box 20 mounted above the structure of the digital panel 1 can be detachable and can adopt either position, blowing hot air outside or inside the reception area 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 envelope 26 30: ceiling of the envelope 26 32, 33: main side walls of the envelope 26 34, 35: secondary side walls of the envelope 26 36: Air intake 37: area of ​​base 28 onto which the internal wall 40 is attached 38: Air outlet 39: perforations forming an air outlet grille 38 40: inner wall 41: proximal end of the inner wall 40 42: free distal end of the inner wall 40 44, 45: longitudinal ends of the inner wall 40 46: main branch of the inner wall 40 48, 50: secondary branches of the internal wall 40 52: awning F: airflow 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

Demands

1. Soundproof enclosure (20) comprising: - an enclosure (26) delimiting a chamber (27) and defining a first direction (X) along its largest dimension (L), the enclosure (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 direction of largest dimension (L36, L38) parallel to the first direction (X); and - an internal wall (40) comprising acoustic foam, the internal wall (40) extending into the chamber (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 direction of largest dimension (L40) parallel to the first direction (X).

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

3. Soundproof enclosure (20) according to claim 2, wherein the inner wall (40) has at least one longitudinal end (44, 45) facing and at a distance from one of the secondary side walls (34, 35) of the enclosure.

4. Soundproof box (20) according to any one of claims 2 or 3, wherein the inner 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, wherein 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) from the ceiling (30) of the enclosure (26).

6. Soundproofing box (20) according to any one of claims 2 to 5, wherein the inner 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. Soundproof box (20) according to the preceding claim, in which the air inlet (36) is, along the first direction, closer to the secondary branch (48, 50) than is the air outlet (38).

8. Soundproofing box (20) according to any one of claims 6 or 7, wherein the secondary branch (48, 50) is a first secondary branch (48), the inner 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 inner wall (40).

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

11. Soundproof box (20) according to any one of the preceding claims, wherein the enclosure (26) has a width (1) along a second direction (Y) and the air inlet and outlet (36, 38) are distant from the inner wall (40) by less than 10% of the width (1) of the enclosure (26).

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

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

14. Soundproof enclosure (20) according to any one of the preceding claims, wherein the enclosure (26) has a width (1) along a second direction (Y) and a height (H) along a third direction (Z), the width (1) being between 1.70 and 3 times the height (H).

15. Soundproofing box (20) according to any one of the preceding claims, wherein the air inlet (36) is centered on the base (28).

16. Soundproof box (20) according to any one of the preceding claims, wherein 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 soundproof box (20) according to any one of the preceding claims, the air inlet (36) of which is in fluidic connection with the ventilation device (24).

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

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

20. Digital panel (1) according to any one of claims 17 to 19, wherein 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 any one of claims 17 to 20, wherein the fluidic connection between the ventilation device (24) and the soundproofing box (20) is ensured by an inlet channel (22) whose cross-section is greater than or equal to the cross-section of the air inlet (36).

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

23. A shelter (100) for travelers according to claim 22 in which the digital panel (1) conforms to claim 20, the air outlet (38) opening outside the reception area (108) for travelers.

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