Ventilation system

Abstract

To provide a ventilation system and an acoustic member that improve sound absorbency and sound insulation, and can be configured not to obstruct a flow of air.SOLUTION: A ventilation system according to one embodiment is a ventilation system 1 that is attached to a wall W and comprises an inlet port 2c and an exhaust port E. The ventilation system comprises an acoustic member 10 that absorbs sounds from the exhaust port E. The acoustic member 10 has: a film-like main body part 11 that faces the exhaust port E; and a peripheral part 12 that mutually connects the main body part 11 and the wall W, and is arranged so as to surround the main body part 11. The main body part 11 is configured to partition an internal space into a first chamber S1 communicating with the exhaust port E, and a second chamber S2 to which air K flows from the inlet port 2c. One part 11b of an outer edge of the main body part 11 is fixed to the peripheral part 12, and a remaining part 11c of the outer edge of the main body part 11 is opened, which in turn serves as a communication part 13 making the first chamber S1 and the second chamber S2 communicate with each other.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] One aspect of the present disclosure relates to a ventilation system and an acoustic member. [Background technology]

[0002] Various types of ventilation systems and acoustic components have been known in the past. Patent Document 1 describes a ventilation structure provided in the interior of a vehicle luggage compartment. The interior is fitted with a trim section consisting of a rear skirt trim section that forms the opening of the rear gate and a rear quarter trim section that forms the interior of the side wall of the corner section. An inlet grill that forms the opening of the ventilation for ventilation is integrally formed with the rear skirt trim section.

[0003] An air passage is formed between the inner surface of the inlet grille and the outer panel that constitutes the exterior plate of the vehicle body. An insulator is attached to the inside of the rear quarter trim. The insulator is provided for thermal insulation from the outside of the vehicle, sound insulation, and sound absorption, and has a sound absorption layer and a sound insulation layer. The insulator is attached to the back side of the trim with the sound insulation layer facing the interior of the vehicle.

[0004] Patent Document 2 describes a vent duct for a vehicle that is disposed on the exterior of the vehicle. The vent duct includes a duct body that is embedded in a duct mounting port formed in a quarter panel that is the exterior of the vehicle, and a housing that includes a housing body and a breathable member. The duct body includes a frame body and a seat valve body that is swingable relative to the frame body. The seat valve body swings relative to the frame body to open and close a vent hole formed in the frame body.

[0005] The housing body is box-shaped and opens toward the duct body. The housing body is fixed to the vehicle interior side of the duct body so as to face the vent of the duct body. The housing body has an opposing wall facing the vent of the duct body, and a recess is formed in the opposing wall, recessed from the opposing wall to the opposite side of the vent. In addition, a breathable member that covers the recess is disposed in the opposing wall, and the recess and the breathable member define a sound absorbing chamber. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2001-253229 A [Patent Document 2] JP 2005-153622 A Summary of the Invention [Problem to be solved by the invention]

[0007] As mentioned above, in a configuration in which an insulator is attached to the back side of a trim, sound passes along the insulator, and the insulator may not be able to absorb and block sound sufficiently, so there is room for improvement in terms of sound absorption and blocking. Also, in a vent duct that has a breathable member that blocks the recess, there is a concern that the air flow may be blocked by blocking the recess. Therefore, it is necessary to not block the air flow. [Means for solving the problem]

[0008] A ventilation system according to one embodiment of the present disclosure is a ventilation system which is attached to a wall and has an inlet and an exhaust port, and further comprises an acoustic member which absorbs sound from the exhaust port, the acoustic member having a membrane-shaped main body portion which faces the exhaust port, and a peripheral portion which connects the main body portion and the wall to each other and is arranged to surround the main body portion, the main body portion partitioning a first air chamber which communicates with the exhaust port, and a second air chamber into which air flows in from the inlet, a part of the outer edge of the main body portion is fixed to the peripheral portion, and the remaining part of the outer edge of the main body portion is open and serves as a communication portion which communicates between the first air chamber and the second air chamber.

[0009] In the ventilation system according to this embodiment, the acoustic member has a membrane-shaped main body portion facing the exhaust port formed in the wall. Therefore, by facing the main body portion of the acoustic member to the exhaust port, the sound from the exhaust port can be effectively absorbed and blocked by the acoustic member, thereby improving the sound absorption and sound blocking properties. The main body portion of the acoustic member divides the internal space of the ventilation system into a first air chamber communicating with the exhaust port and a second air chamber into which air flows in from the inlet of the ventilation system. By dividing the first air chamber and the second air chamber in this way, the sound from the exhaust port can be more effectively absorbed and blocked. In addition, a part of the outer edge of the main body portion of the acoustic member is fixed to the peripheral portion of the acoustic member, and the remaining part of the outer edge of the main body portion is a communication portion that communicates the first air chamber and the second air chamber. Therefore, the air that flows into the second air chamber from the inlet can be circulated to the exhaust port via the communication portion and the first air chamber. Therefore, it is possible to prevent the flow of air from being obstructed.

[0010] The device may include an inner member defining the second chamber together with the main body, and the inlet may be formed in the inner member.

[0011] The inner member may be connected to the wall.

[0012] A lower portion of the outer edge of the body may be secured to the peripheral edge.

[0013] At the communication portion, air that has flowed into the second chamber from the inlet may flow into the first chamber, and at the exhaust port, air that has flowed into the first chamber from the communication portion may be exhausted from the first chamber.

[0014] The main body portion is in the form of a film extending in a first direction and a second direction, the wall and the main body portion are aligned along a third direction intersecting both the first direction and the second direction, the exhaust port and the inlet port are formed on one side of either the first direction or the second direction, and the communicating portion may be formed on the other side of either the first direction or the second direction.

[0015] Either the first direction or the second direction may be a lower side, and the other of the first direction or the second direction may be an upper side.

[0016] The wall may include an outer wall and an inner wall, the exhaust port may be formed in the outer wall, and at least a portion of the periphery may be attached to the inner wall.

[0017] The exterior wall may be an outer panel of the vehicle, the interior wall may be an inner panel of the vehicle, and the exhaust vent may be a vent duct of the vehicle.

[0018] The inner member may be a luggage side trim that covers the inside of the wall.

[0019] The acoustic member may include a nonwoven fabric.

[0020] The acoustic member may include a skin layer and a core layer comprising a material different from that of the skin layer.

[0021] The acoustic member includes a porous layer and a porous carbon in contact with the porous layer, and the porous carbon has a thickness of 0.1 mm. 2 / g or more and 10000m 2 / g or less, and a non-uniform filler having an average surface area of ​​100 MKS Rayls or more and 5000 MKS Rayls or less, and the acoustical member may have an airflow resistance value of 100 MKS Rayls or more and 5000 MKS Rayls or less.

[0022] The acoustic member includes a porous layer and a porous material received in the porous layer, the porous material having an average grain size of 1 μm or more and 1000 μm or less and an average grain size of 0.1 μm or less. 2 / g or more and 800m2 / g or less, and the acoustic member may have an airflow resistance value of greater than or equal to 100 MKSRayls and less than or equal to 8000 MKSRayls.

[0023] An acoustic member according to one embodiment of the present disclosure comprises a membrane-shaped main body portion and a peripheral portion connected to a portion of the outer edge of the main body portion and formed to surround the main body portion.

[0024] In the acoustic member according to this embodiment, by placing the membrane-shaped main body portion facing the exhaust port, the main body portion can effectively absorb and block sound from the exhaust port, thereby improving sound absorption and sound blocking properties. The acoustic member includes a peripheral portion that is connected to a part of the outer edge of the main body portion and is formed so as to surround the main body portion, so that the remaining part of the outer edge of the main body portion can be open when the peripheral portion is attached to a wall or the like. This open portion can be used as a passage for air, so that the flow of air is not obstructed.

[0025] The peripheral portion may be formed by heat pressing.

[0026] The periphery may be formed by a frame.

[0027] The main body portion may divide a specified space into a first air chamber and a second air chamber, and a part of the outer edge of the main body portion may be fixed to the peripheral portion, and the remaining part of the outer edge of the main body portion may be open or may serve as a communicating portion that connects the first air chamber and the second air chamber. Effect of the Invention

[0028] According to one embodiment of the present disclosure, it is possible to improve sound absorption and sound insulation while preventing the air flow from being obstructed. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a diagram illustrating an example of a wall to which a ventilation system according to an embodiment is attached. [Diagram 2] FIG. 2 illustrates an exemplary inner member of a wall mounted ventilation system. [Diagram 3] FIG. 3 is a schematic diagram showing a portion of an exemplary wall to which a ventilation system is attached. [Figure 4] FIG. 4 is a cross-sectional view that illustrates a ventilation system according to an embodiment. [Diagram 5] FIG. 5 is a diagram showing a schematic layer structure of an exemplary acoustic member. [Figure 6] FIG. 6 is a schematic diagram illustrating the locations of the speakers and microphones arranged in an experiment using an acoustic member. [Figure 7] FIG. 7 is a schematic diagram illustrating the locations of the speakers and microphones arranged in an experiment using an acoustic member. [Figure 8] FIG. 8 is a graph showing the relationship between sound frequency and noise obtained from the experiment. [Figure 9] FIG. 9 is a graph showing the relationship between sound frequency and noise obtained from the experiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, examples of embodiments for implementing the ventilation system and acoustic member according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions are omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0031] First, the term "ventilation system" in the present disclosure refers to a device, equipment, member, or part that can allow air to flow from one side of a wall to the other side. A "wall" refers to a member that separates a space, and an example is a panel. The spaces facing one side and the other side of a wall may each be closed or open. An "exhaust port" refers to an opening formed in a wall through which air flows from one side of the wall to the other side. An "inlet" refers to an opening formed in a ventilation system through which air flows into the ventilation system.

[0032] "Sound absorbing" refers to absorbing sound, and "sound insulating" refers to blocking sound. "Acoustic member" refers to a member or part that performs at least one of sound absorbing and sound insulating functions. "Membrane-like" refers to a state of extending two-dimensionally. "Main body" refers to a main part or member of an acoustic member, for example, a main part of an acoustic member that performs sound absorbing or sound insulating functions. "Porous" refers to the property of being air permeable.

[0033] "Peripheral portion" refers to the peripheral portion of the main body. "First air chamber" refers to one of a pair of spaces obtained by dividing a specific space, and "second air chamber" refers to the other of the pair of spaces. "Inside" refers to one side of a wall, and "inner member" refers to a member or part arranged on one side of a wall. "Outer wall" refers to a wall that is provided on the outside when viewed from the space defined by the wall, and "inner wall" refers to a wall that is provided on the inside of the space.

[0034] "Luggage side trim" refers to a cover that covers one side of a wall that defines a space. "Automobile" refers to a moving body that has a body, wheels that support the body, and a power source, and that moves when the wheels are driven by the power of the power source. "Outer panel" refers to the outer panel of an automobile body, and "inner panel" refers to the inner panel of an automobile body. "Vent duct" refers to a part provided on an automobile body that allows air to circulate inside and outside the body.

[0035] The acoustic member and ventilation system according to the embodiment absorb (sound-absorb) sound from an exhaust port. The object to which the acoustic member and ventilation system are attached may be transportation equipment including automobiles, trains, and aircraft, machinery, buildings, or other structures. The acoustic device and ventilation system according to the embodiment absorbs or blocks sound penetrating the wall while ensuring air circulation inside and outside the wall when attached to the wall of the object.

[0036] Fig. 1 is a diagram showing an exemplary wall W to which a ventilation system according to an embodiment is attached. Fig. 2 is a diagram showing an exemplary ventilation system 1 according to an embodiment. As shown in Figs. 1 and 2, for example, the wall W constitutes a rear panel of a vehicle body B of an automobile. The wall W includes an inner wall W1 located inside the vehicle body B and an outer wall W2 located outside the vehicle body B relative to the inner wall W1. For example, the inner wall W1 is an inner panel of the vehicle body B, and the outer wall W2 is an outer panel of the vehicle body B.

[0037] The outer wall W2 includes, for example, a first wall portion W21, a second wall portion W22 located below the first wall portion W21, and a third wall portion W23 extending from one end of the second wall portion W22 in a direction intersecting (for example, perpendicular to) the second wall portion W22. As an example, the inner wall W1 has an uneven shape including a protrusion W13 protruding toward the inside of the vehicle body B. For example, an exhaust port E that exhausts air from the inside of the vehicle body B to the outside is formed in the second wall portion W22.

[0038] The exhaust port E is, for example, a vent duct of the vehicle body B. The exhaust port E is, for example, rectangular having a pair of short sides E1 extending along a first direction D1 and a pair of long sides E2 extending along a second direction D2 intersecting the first direction D1. For example, the first direction D1 indicates the vertical direction, and the second direction D2 indicates the front-rear direction of the automobile. For example, the first direction D1 is perpendicular to the second direction D2. However, the first direction D1 does not have to be perpendicular to the second direction D2. In addition, the shape of the exhaust port E may be a shape other than a rectangular shape, and is not particularly limited.

[0039] For example, an inner member 2 of the ventilation system 1 is attached to the inner wall W1. The inner member 2 covers, for example, the wall W (the inner wall W1 and the outer wall W2) from the inside of the vehicle body B. As an example, the inner member 2 is a luggage side trim of the vehicle body B. For example, the inner member 2 has an uneven shape including a convex portion 2b protruding to the inside of the vehicle body B, and the uneven shape of the inner member 2 follows the uneven shape of the inner wall W1. The inner member 2 has an inlet 2c that allows air to flow into the inside of the ventilation system 1. The inlet 2c is, for example, a slit-shaped inlet that extends linearly along the first direction D1. The inner member 2 has a plurality of inlets 2c, and for example, the plurality of inlets 2c are arranged along the second direction D2.

[0040] Fig. 3 is a diagram for explaining the position where the ventilation system 1 is attached on the wall W. Fig. 4 is a vertical cross-sectional view of the ventilation system 1. As shown typically in Figs. 3 and 4, the ventilation system 1 covers a first area A1 facing the second wall portion W22 of the outer wall W2 and a second area A2 located above the first area A1 from the inside of the vehicle body B. The first area A1 is an area that faces the acoustic member 10 according to the embodiment, and the second area A2 is an area that does not face the acoustic member 10 (an area that forms a communication portion 13 described later).

[0041] For example, the length L1 of the first region A1 in the first direction D1 may be 300 mm or more and 1000 mm or less, and the lower limit of the length L1 may be 400 mm or 500 mm. The upper limit of the length L1 may be 900 mm, 800 mm, or 700 mm. The length L2 of the first region A1 in the second direction D2 is, for example, 100 mm or more and 800 mm or less. The lower limit of the length L2 may be 200 mm, 300 mm, or 400 mm, and the upper limit of the length L2 is 700 mm, 600 mm, or 500 mm. As an example, the length L1 is 600 mm, and the length L2 is 450 mm.

[0042] The length L3 of the second region A2 in the first direction D1 is, for example, 20 mm or more and 600 mm or less. The lower limit of the length L3 may be 40 mm, 60 mm, 80 mm, or 120 mm, and the upper limit of the length L3 may be 400 mm, 250 mm, 200 mm, or 150 mm. The length L4 of the second region A2 in the second direction D2 is, for example, 100 mm or more and 500 mm or less. The lower limit of the length L4 may be 200 mm, and the upper limit of the length L4 may be 400 mm or 300 mm. As an example, the length L3 is 100 mm, and the length L4 is 250 mm.

[0043] The ventilation system 1 includes an inner member 2 and an acoustic member 10 facing the exhaust port E inside the vehicle body B. The acoustic member 10 includes a main body 11 facing the exhaust port E and absorbing or blocking sound from the exhaust port E, and a peripheral portion 12 provided to surround the main body 11. For example, the main body 11 is a portion that exhibits an acoustic effect, and the peripheral portion 12 is a portion that does not exhibit an acoustic effect and includes a portion that is fixed to the wall W. The main body 11 is membrane-like. The main body 11 extends in a first direction D1 and a second direction D2, and has a thickness in a third direction D3 that intersects both the first direction D1 and the second direction D2.

[0044] The acoustic member 10 (e.g., the peripheral portion 12) may be produced by, for example, cutting out a flexible sheet-like material. The peripheral portion 12 may be fixed to the wall W by a single-sided adhesive tape, a double-sided adhesive tape, an adhesive, a mechanical fastener, a clip, or the like. The peripheral portion 12 may be fixed by tape at, for example, three, four, five, or more locations (e.g., the locations indicated by the dotted circle marks in FIG. 3) intermittently or continuously. In the acoustic member 10, the edge of the cut portion cut out as described above may not be subjected to any particular treatment, but a part or all of a region within a range of about 1 mm to 20 mm from the edge may be heat-pressed and hardened. This heat pressing may be performed continuously, intermittently, or discontinuously in the direction along the edge. In addition, the acoustic member 10 may be fixed in a state where the height of the sheet-like material described above is adjusted to a frame-shaped (or a U-shaped frame with a part open) frame that has been previously formed.

[0045] A portion 11b of the outer edge of the main body 11 is fixed to the peripheral portion 12. The portion 11b is, for example, a portion including a lower portion of the main body 11. Both ends of the main body 11 in the second direction D2 may be fixed to the peripheral portion 12. The portion 11b of the main body 11 is, for example, a region including the outer edge of the first region A1, and the main body 11 (portion 11b) may be fixed to the peripheral portion 12 at the outer edge of the first region A1. The remaining portion 11c of the main body 11 is open, and is, for example, a free end. In this case, the remaining portion 11c of the main body 11 is not fixed anywhere. The remaining portion 11c of the main body 11 faces the inner wall W1 via a communication portion 13 described later.

[0046] The peripheral portion 12 has a film shape. The peripheral portion 12 may be formed by heat pressing. The peripheral portion 12 may also be formed by a frame surrounding at least a part of the main body portion 11. A part of the peripheral portion 12 may be bent from a part 11b of the outer edge of the main body portion 11 and extend along a plane intersecting both the first direction D1 and the second direction D2. The peripheral portion 12 extends along the outer edge of the first region A1, and the part 11b of the main body portion 11 is fixed at a portion along the outer edge of the first region A1.

[0047] For example, the wall W includes an outer wall W2 including a second wall portion W22 in which the exhaust port E is formed, and an inner wall W1 located inside the outer wall W2. The inner wall W1 protrudes from the outer wall W2 to the inside of the vehicle body B, and the inner member 2 is fixed to the inner wall W1. For example, a rear bumper W3 is provided on the outside of the vehicle body B as viewed from the exhaust port E and the second wall portion W22, and the air K discharged from the exhaust port E is discharged to the outside of the vehicle body B through a gap between the rear bumper W3 and the second wall portion W22.

[0048] An inner member 2 is provided on the opposite side of the inner wall W1 to the outer wall W2. The inner member 2 extends in the first direction D1 and the second direction D2 between the peripheral edge portion 12 and the inner wall W1. In a state in which the ventilation system 1 is attached to the exhaust port E of the wall W, for example, the inner member 2, the acoustic member 10 (main body portion 11), the outer wall W2 (second wall portion W22), and the rear bumper W3 are arranged in this order along the third direction D3. The inner member 2, the inner wall W1, and the outer wall W2 define an internal space S of the ventilation system 1.

[0049] The main body 11 of the acoustic member 10 divides the internal space S into a first air chamber S1 that communicates with the exhaust port E, and a second air chamber S2 into which air K flows in from the inlet 2c. As described above, a part 11b of the outer edge of the main body 11 is fixed to the peripheral edge 12, which is further fixed to the wall W, and the remaining part 11c of the outer edge of the main body 11 is open. A communication part 13 that communicates between the first air chamber S1 and the second air chamber S2 is formed in the remaining part 11c of the main body 11.

[0050] The inner member 2 has an inlet 2c through which air K flows into the ventilation system 1. The inlet 2c is formed, for example, at one end (as an example, a lower end) of the ventilation system 1 in the first direction D1. The air K that flows from the inlet 2c into the second air chamber S2 reaches the communication part 13. The communication part 13 is formed, for example, at the other end (as an example, an upper end) of the ventilation system 1 in the first direction D1.

[0051] The air K that has reached the communication part 13 flows from the communication part 13 into the first air chamber S1 and reaches the exhaust port E. For example, the exhaust port E is formed at one end side (as an example, the lower end) in the first direction D1 of the ventilation system 1. The air K that has flowed into the internal space S (second air chamber S2) of the ventilation system 1 from the inlet 2c flows, for example, in an inverted U-shape, bypasses the main body 11 of the acoustic member 10, reaches the exhaust port E, and is discharged from the ventilation system 1.

[0052] A flap F (see FIG. 3), for example, in the form of a rubber plate, is attached to the exhaust port E. The flap F is attached to the exhaust port E so as to be swingable in the third direction D3, and functions as a valve for the exhaust port E. For example, even when the flap F is closed while driving, sound T such as road noise and wind noise is generated, and the sound T enters the internal space S of the ventilation system 1 from the exhaust port E. As shown in FIG. 4, part of the sound T flows from the first air chamber S1 through the communication part 13 to the second air chamber S2. However, the remaining part of the sound T is absorbed by the main body part 11 of the acoustic member 10.

[0053] FIG. 5 is a diagram showing an exemplary layer structure of the acoustic member 10 (each of the main body portion 11 and the peripheral portion 12). As shown in FIG. 5, the acoustic member 10 has a core layer 10b and a skin layer 10d formed on at least one of a pair of main surfaces 10c of the core layer 10b. FIG. 5 shows an example in which the skin layer 10d is formed on each of the pair of main surfaces 10c of the core layer 10b. However, the skin layer 10d may be formed on only one of the main surfaces 10c of the core layer 10b. The skin layer 10d functions, for example, as a skin of the core layer 10b.

[0054] The material of the core layer 10b and the material of the skin layer 10d may be the same or different. For example, the material of the core layer 10b and the material of the skin layer 10d may include polypropylene (PP). The type of the core layer 10b is not particularly limited, and various sound-absorbing materials can be used as the core layer 10b. At least one of the core layer 10b and the skin layer 10d may be omitted. For example, the core layer 10b includes one or more porous layers. Useful porous layers may be nonwoven fabrics, felt materials, urethane foam materials, microfibers, perforated films, particulate beds, open-cell foams, fiberglass, nets, woven fabrics, or combinations thereof. The skin layer 10d may also include one or more porous layers. Exemplary skin layers 10d and core layers 10b may each include at least one of melt-blown fibers, staple fibers, and binder fibers. The material of the acoustic member 10 is not particularly limited, and may include rubber. That is, the acoustic member 10 may be, for example, a rubber plate.

[0055] The acoustic member 10 is made of, for example, melt-blown microfibers. Both the core layer 10b and the skin layer 10d may be made of melt-blown microfibers, or only one of them may be made of melt-blown microfibers.

[0056] The acoustic member 10 may include meltblown fibers, staple fibers, and / or binder fibers. The binder fibers may be dispersed in the meltblown fibers or may be at least partially melt-bonded by the meltblown fibers. The binder fibers may function as a binder by being at least partially melt-bonded to the high melting point meltblown fibers.

[0057] The melt-blown fibers of the core layer 10b or the skin layer 10d may be made of a resin having a higher melting point than the above-mentioned melt-bonded portion of the binder fiber, and may be made of a fibrous material produced by the melt-blowing method. The melt-blowing method is a method of melting a resin material, extruding the resin material from a nozzle, and blowing a high-temperature air current onto the fibrous resin, thereby making the fiber diameter finer.

[0058] For example, the acoustic member 10 is a membrane-shaped acoustic member. The exemplary acoustic member 10 includes meltblown fibers having a fiber diameter of 10 μm or less, binder fibers dispersed in the meltblown fibers and at least a portion of which is melt-bonded to the meltblown fibers, and staple fibers.

[0059] The staple fiber may be made of any of polyester, polyamide, acrylic, polypropylene, and polyethylene, but is preferably made of polyester fiber in terms of weather resistance, flame retardancy, and recyclability. The staple fiber has a fiber thickness of, for example, 1 denier or more and 100 denier or less.

[0060] The staple fibers are preferably thicker in terms of processability and handling, and are preferably 3 denier or more and 50 denier or less, particularly in consideration of improving productivity with a fiber spreader. From the standpoint of sound absorption, the staple fibers are preferably thinner, and in order to improve sound absorption in the low frequency range of 200 to 1500 Hz, a thin fiber of 15 denier or less is preferred.

[0061] From the viewpoint of processability and handling, the fiber length of the staple fiber is preferably 30 mm or more and 100 mm or less. The cross-sectional shape of the staple fiber may be any of irregular cross-sections such as a circular shape, a T-shape, and a flat shape, and may be a hollow fiber. The staple fiber may be a fiber having crimps, and the crimp state may be, for example, any of a wavy shape, a spiral type, and a combination of a wavy type and a spiral type. If the number of crimps is too small, elasticity and hardness may be insufficient, and if the number of crimps is too large, processing problems may occur. For example, those having 5 to 200 crimps / 25 mm, more preferably 10 to 50 crimps / 25 mm are used.

[0062] The binder fibers contained in the acoustic member 10 may have a melting point lower than that of the high melting point melt-blown fibers at least in a part of the surface. For example, the melting point of the low melting point portion of the binder may be 10° C. or more (or 20° C. or more) lower than that of the melt-blown fibers. For example, low melting point polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), etc. may be used as the low melting point portion of the binder fiber.

[0063] For example, when polybutylene terephthalate (PBT) with a melting point of about 220° C. is used as the melt-blown fiber, or when polypropylene with a melting point of about 160° C. is used as the binder fiber, low-melting polyethylene terephthalate (PET) with a surface melting point of 110° C. or the like can be used. When used as a sound absorbing material for vehicles, the binder fiber may have a melting point of 90° C. or higher, 100° C. or higher, or 120° C. or higher in order to withstand environmental resistance tests.

[0064] The binder fiber may be fibrous, and the cross-sectional diameter and length of the binder fiber are not particularly limited. From the viewpoint of increasing dispersibility, the binder fiber may be short fiber. As the binder fiber, a staple fiber having a fiber length of 10 mm or more and 100 mm or less, which is produced by cutting spun fibers, can be used. Since the fibrous binder has a high contact density with the melt-blown fiber at least in a part, efficient melt adhesion between the fibers is possible, and the amount of binder fiber required can be reduced.

[0065] The binder fiber does not have to be a material having a uniform melting point as a whole, and may have a low melting point layer at least on the surface. For example, it may be a fiber having a core-sheath structure, and only the sheath part may have a low melting point. When using such a fiber having a core-sheath structure, when it is mixed with the melt-blown fiber, only the low melting point binder in the sheath part melts, and the core part remains as a fiber together with the melt-blown fiber, making it possible to improve the air resistance without impairing the properties of the melt-blown fiber. In addition, the partially meltable binder fiber can be easily handled because it bonds between the melt-blown fibers by melting.

[0066] The acoustic member 10 may have a polymeric nonwoven layer that may be made by a meltblowing process. A meltblown polymeric nonwoven layer may contain very fine fibers. In meltblowing, a thermoplastic polymer stream is forced through an orifice in a die and attenuated by converging streams of hot air to form fine fibers. The acoustic member 10 may be constructed by melt spinning.

[0067] The fibers produced by melt spinning may be spunbonded. A web containing a set of melt spun fibers is collected as a fibrous web. The acoustic member 10 may include melt spun fibers. The resins that make up these fibers may include, for example, polyolefins such as polypropylene or polyethylene, polyesters, polyethylene terephthalate, polybutylene terephthalate, polyamides, polyurethanes, polybutenes, polylactic acid, polyphenylene sulfide, polysulfones, liquid crystal polymers, polyethylene-covinyl acetate, polyacrylonitrile, cyclic polyolefins, or copolymers or mixtures thereof. The acoustic member 10 may be made from a thermoplastic semi-crystalline polymer. The thermoplastic semi-crystalline polymer includes semi-crystalline polyesters or aliphatic polyesters.

[0068] The molecular weight of the aliphatic polyester is not particularly limited. The molecular weight may be, for example, 15,000 (g / mol) or more and 6,000,000 g / mol or less, 20,000 (g / mol) or more and 2,000,000 g / mol or less, or 40,000 (g / mol) or more and 1,000,000 g / mol or less. The molecular weight may be 25 (g / mol) or more. Further, the molecular weight is 15,000 (g / mol), 20,000 (g / mol), 25,000 (g / mol), 30,000 (g / mol), 35,000 (g / mol), 40,000 (g / mol), 45,000 (g / mol), 50,000 (g / mol), 60,000 (g / mol), 70,000 (g / mol), 80,000 (g / mol), 90,000 (g / mol). , 100,000 (g / mol), 200,000 (g / mol), 500,000 (g / mol), 700,000 (g / mol), 1,000,000 (g / mol), 2,000,000 (g / mol), 3,000,000 (g / mol), 4,000,000 (g / mol), 5,000,000 (g / mol), and 6,000,000 (g / mol).

[0069] The acoustic member 10 may include a polymer nonwoven fabric layer, and the diameter of the fibers of the polymer nonwoven fabric layer is not particularly limited. The diameter may be, for example, 0.1 μm or more and 10 μm or less, 0.3 μm or more and 6 μm or less, or 0.3 μm or more and 3 μm or less. The diameter may be less than 0.1 μm. Furthermore, the diameter may be 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 1 ... The thickness may be any of 0 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 22 μm, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, 37 μm, 40 μm, 42 μm, 45 μm, 47 μm, 50 μm, 53 μm, 55 μm, 57 μm, and 60 μm.

[0070] The acoustic member 10 may have a porous polymer (may be a porous layer). That is, the acoustic member 10 may be a layer having many fine pores formed therein. The acoustic member 10 may be a perforated film or an open-cell foam. When the acoustic member 10 has fine pores, the average diameter of the pores may be 10 μm or more and 5000 μm or less. The average diameter of the holes may be any of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 150 μm, 170 μm, 200 μm, 300 μm, 350 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 1500 μm, 2000 μm, 3000 μm, 4000 μm, and 5000 μm. The shape of the holes is not limited to a circle, and may be a polygon or an oval. For greater clarity, the diameter of a non-circular hole is defined herein as the diameter of a circle that, in plan view, has the same area as the non-circular hole.

[0071] If the acoustic member 10 has holes, the porosity of the acoustic member 10 may be, for example, 0.1% to 80%, 0.2% to 70%, or 0.5% to 60%. The porosity of the acoustic member 10 may also be any of 0.2%, 0.3%, 0.4%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%.

[0072] The acoustic member 10 may be made of fiberglass. The acoustic member 10 may constitute a Helmholtz resonator. The acoustic member 10 may include at least one of a polymer composition and an inorganic composition. The acoustic member 10 may be in the form of a film. The acoustic member 10 may have a through hole.

[0073] The acoustic member 10 may include a porous layer, which provides excellent sound absorption over a wide frequency range. The porous layer of the acoustic member 10 may include organic and / or inorganic particles, which may provide synergistic sound absorption.

[0074] The porous layer constituting the acoustic member 10 may be in contact with or may include at least one non-uniform filler that can improve the acoustic performance. The non-uniform filler may include organic particles, inorganic particles, porous particles, etc., and suitable non-uniform fillers include porous particles. It may be characterized by open pores, closed pores, or a combination thereof. The non-uniform filler may be rigid, so that the movement of the filler material is negligible compared to the movement of the fluid phase (e.g., air) in the acoustical environment. In the acoustical member 10, the non-uniform filler may form the interstices of the porous medium that generate an acoustic absorption profile. The configuration of this acoustic absorption profile can be adjusted by a combination of particle properties.

[0075] Filler particles with open pores include zeolites, aerogels, porous alumina, mica, perlite, granular polyurethane foam particles, metal-organic frameworks (MOFs), or porous carbon materials. Filler particles with closed pores include closed-cell foam particles or hollow particles. Hollow particles with a single pore (or cavity) include expanded polymer microspheres, ceramic microspheres, or hollow glass bubbles.

[0076] The non-uniform filler may be present in various configurations relative to the porous layer. For example, when the porous layer is a non-woven fibrous layer, an open-cell foam, or a particulate bed, the non-uniform filler may be embedded in the non-woven fibrous layer, the open-cell foam, or the particulate bed. When the porous layer includes a perforated film, the non-uniform filler may be at least partially present within a plurality of openings extending through the perforated film. In some embodiments, at least 5%, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, or at least 95% of the non-uniform filler in contact with the porous layer may be present within a plurality of openings. Alternatively, the non-uniform filler may be present as a separate layer adjacent to the porous layer.

[0077] The porous particles can include macropores (having a width greater than 50 nanometers), mesopores (having a width less than 50 nanometers and greater than 2 nanometers), micropores (having a width less than 2 nanometers), and / or combinations of the above. These non-uniform fillers include, for example, porous carbon particles. Porous carbon particles include activated carbon or vermifoam carbon.

[0078] Activated carbon is a highly porous carbonaceous material with a composite structure composed mainly of carbon atoms. The activation process can be carried out using steam at high temperatures of about 1000°C, or in some cases, using phosphoric acid at lower temperatures. The network of pores in activated carbon are channels formed within a rigid skeleton of disordered layers of carbon atoms, interconnected by chemical bonds and stacked unevenly. This creates a highly porous structure formed by numerous pits and cracks in the carbon layers.

[0079] One of the characteristics of activated carbon is its ability to adsorb gas molecules. Internal pore volume: 0.3 m 3 1m of activated carbon 3 So, 30m 3 The behavior of porous carbon in acoustic articles is consistent with the adsorption of ambient air molecules. When porous carbon adsorbs air molecules in a confined space, the effective air volume can be more than twice the air volume in the same space without the porous carbon. By expanding the effective air volume in the acoustic cavity, porous carbon tends to shift the acoustic resonance frequency from high to low. This frequency shift can be interpreted as a quarter-wave shortening in acoustic absorption (or a slowing down of the speed of sound in the acoustic medium), providing high acoustic performance in a thinner layer.

[0080] Vermiform carbon (or vermiform graphite) is a layered form of porous carbon made by introducing guest molecules into expandable graphite that permeate the graphite layers. At high temperatures, the guest molecules undergo a phase change. This phase change reaction creates enough pressure to push the graphite layers apart, causing the particle to rapidly increase in volume if unrestrained. Expanded graphite has a worm-like structure known as vermiform graphite.

[0081] Vermiform graphite is notable because it has a larger pore structure than activated carbon, given its lack of micropores (pores smaller than 2 nm). Vermiform carbon has a surface area of ​​1 m 2 / g, which is several orders of magnitude less than the surface area of ​​activated carbon. These differences allow vermifoam carbon to be used more effectively to attenuate higher frequency noise than activated carbon. As a result, it may be advantageous to use a mixture of activated carbon and vermifoam carbon to enhance acoustic absorption over a wide frequency range.

[0082] The average size of the particles that make up the non-uniform filler can be related to processing considerations that affect acoustic absorption as well as the mechanical properties of the acoustic article. In Vermiform graphite, for example, smaller platelets produce layers with a higher overall ratio of edge area to internal volume. As particle size decreases, the efficiency of the escape paths for expansion gases increases, reducing the overall expansion potential and shrinking pore size.

[0083] It has been found that the temperature at which Vermiform graphite is processed also affects acoustic performance, with particles processed at higher temperatures tending to exhibit a higher degree of expansion between the layers. Using a spring model for the graphite layers allows the spring to expand more, i.e. make the spring more flexible, which improves acoustic damping.

[0084] Excluding aggregates, the non-uniform filler may have an average particle size of 0.1 micrometers to 2000 micrometers, 5 micrometers to 1000 micrometers, or 10 micrometers to 500 micrometers, and in some embodiments may have an average particle size less than, equal to, or greater than 0.1, 0.2, 0.5, 1, 2, 5, 7, 10, 15, 20, 30, 40, 50, 70, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1200, 1500, 1700, or 2000 micrometers.

[0085] Due to their porous nature, heterogeneous packings are capable of having large surface areas and, as a result, adsorption capabilities. By having high surface area density, they can reflect a high degree of complexity and tortuosity in the pore structure, resulting in greater internal reflection and energy transfer to the solid structure due to frictional losses. This is manifested as absorption of airborne noise. The average surface area of ​​heterogeneous packings is 0.1 m 2 / g~10,000m 2 / g, 0.5m 2 / g~5000m 2 / g, or 1m 2 / g~2500m 2 In some embodiments, the viscosity may be 0.1, 0.2, 0.5, 0.7, 1, 2, 5, 10, 20, 50, 100, 120, 150, 200, 250, 300, 350, 400, 450, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 6000, 7000, 8000, 9000, or 10,000 m 2 The value of / g may be less than, equal to, or greater than this.

[0086] In some embodiments, the high surface density of the non-uniform packing is due to the presence of very fine pores. Activated carbon, for example, exhibits micropores with dimensions less than 2 nm, which account for the majority of the surface area in the carbon particles.

[0087] The heterogeneous filler may have a number average pore size of 0.1 nanometers to 50 micrometers, 1 nanometer to 40 micrometers, or 2.5 nanometers to 30 micrometers, and in some embodiments may be less than, equal to, or greater than 0.1 nanometers, 0.2, 0.3, 0.4, 0.5, 1, 1.2, 1.5, 1.7, 2, 3, 4, 5, 7, 10, 15, 20, 25, 30, 40, 50, 70, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900 nanometers, 1 micrometer, 2, 3, 4, 5, 7, 10, 15, 20, 25, 30, 35, 40, 45, or 50 micrometers.

[0088] The non-uniform filler particles can exhibit smaller pore sizes than conventional fillers used in acoustic applications. For example, the smallest pores of activated carbon can be less than 2 nm in diameter. Vermiform carbon generally has pores with diameters of tens of micrometers, but does not have pores in the nanometer or sub-nanometer range. Generally, the non-uniform filler can have a smallest pore size of up to 500 nm, up to 400 nm, up to 300 nm, up to 200 nm, up to 100 nm, up to 50 nm, up to 20 nm, up to 10 nm, up to 5 nm, up to 2 nm, or up to 1 nm.

[0089] The uneven filling is 0.01 cm 3 / g~5cm 3 In some embodiments, the number average pore volume is 0.01, 0.02, 0.05, 0.07, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.5, 3, 3.5, 4, 4.5, or 5 cm 3 The value of / g may be less than, equal to, or greater than this.

[0090] As previously discussed, the use of two or more different types of non-uniform fillers can be effective in improving the acoustic response of a composite article. In some embodiments, two or more different types of fillers are mixed within a porous layer of an acoustic article. In other embodiments, different types of fillers are mixed within a particulate bed adjacent one or two porous layers within an acoustic article. In other embodiments, different types of fillers are present but disposed in separate layers and may be provided independently within a porous layer or particulate bed.

[0091] If the heterogeneous filler is a particulate mixture of two or more fillers, the mixture may be up to 1300 m 2 a first heterogeneous packing material having an average surface area of ​​at least 1300 m / g; 2 and a second heterogeneous filler having an average surface area of ​​up to 500 m / g. Alternatively, the mixture may include a second heterogeneous filler having an average surface area of ​​up to 500 m2 a first heterogeneous packing material having an average surface area of ​​at least 500 m / g; 2 and a second heterogeneous filler having an average surface area of ​​up to 100 m / g. Alternatively, the mixture may include a second heterogeneous filler having an average surface area of ​​up to 100 m 2 a first heterogeneous packing material having an average surface area of ​​at least 100 m 2 and a second heterogeneous filler having an average surface area of ​​up to 10 m / g. Alternatively, the mixture may include a second heterogeneous filler having an average surface area of ​​up to 10 m 2 a first heterogeneous packing material having an average surface area of ​​at least 10 m 2 and a second heterogeneous filler having an average surface area of ​​about 100 nm to about 100 nm.

[0092] Additionally, the mixture can include a heterogeneous filler having a number average pore volume of up to 500 nanometers and a second heterogeneous filler having a number average pore volume of at least 500 nanometers. Alternatively, the mixture can include a heterogeneous filler having a number average pore volume of up to 1 micrometer and a second heterogeneous filler having a number average pore volume of at least 1 micrometer.

[0093] As yet another example, the filler may be comprised of two or more different filler compositions, such as a combination of activated carbon, vermifoam carbon, zeolites, metal organic frameworks (MOFs), perlite, alumina, glass bubbles, and glass beads.

[0094] As another example, the acoustic member 10 may include a fibrous nonwoven layer and / or adhesive fibers, which may be made of polypropylene, polyethylene terephthalate, styrene-isoprene-styrene, or polyethylene / polypropylene copolymers.

[0095] The airflow resistance of the acoustic member 10 may be 100 MKS Rayls or more and 8000 MKS Rayls or less. The airflow resistance of the acoustic member 10 may be 100 MKS Rayls or more and 5000 MKS Rayls or less, 20 MKS Rayls or more and 3000 MKS Rayls or less, or 50 MKS Rayls or more and 1000 MKS Rayls or less. The airflow resistance value of the acoustic member 10 is 20MKS Rayls, 30MKS Rayls, 40MKS Rayls, 50MKS Rayls, 70MKS Rayls, 100MKS Rayls, 200MKS Rayls, 300MKS Rayls, 400MKS Rayls, 500MKS Rayls, 600MKS Rayls, 700MKS Rayls, 1000MKS Rayls, 1100MKS Rayls, 1200MKS Rayls, 1500MKS Rayls, 1700MKS Rayls, 2000MKS Rayls, 3000MKS Rayls, 3500MKS Rayls, 4000MKS Rayls, 5000MKS Rayls, 5500MKS Rayls, 6000MKS Rayls, 6500MKS Rayls, 7000MKS Rayls, 7500MKS Rayls, and 8000MKS. It may be any of the Rayls.

[0096] The filler of the acoustical member 10 may be non-uniformly dispersed in the porous layer of the acoustical member 10. The filler of the acoustical member 10 may be received in the porous layer. The acoustical member 10 may include a nonwoven fibrous web. The filler may be diatomaceous earth, a vegetable-based filler, unexpanded graphite, a polyolefin foam, or a combination thereof. Furthermore, the filler of the acoustic member 10 is 1 mass% or more and 99 mass% or less, 10 mass% or more and 90 mass% or less, 15 mass% or more and 85 mass% or less, 20 mass% or more and 80 mass% or less, 1 mass% or less, 1 mass% or more, 2 mass%, 3 mass%, 4 mass%, 5 mass%, 7 mass%, 10 mass%, 12 mass%, 15 mass%, 20 mass%, 30 mass%, 35 mass%, 40 mass%, 45 mass%, 50 mass%, 55 mass%, 60 mass%, 65 mass%, 70 mass%, 75 mass%, 80 mass%, 85 mass%, 90 mass%, 95 mass%, 97 mass%, 98 mass%, or 99 mass%. The filler of the acoustic member 10 may be at least one of fine fillers such as clay, diatomaceous earth, graphite, glass foam, porous carbon, porous and the like, polymeric fillers, non-layered silicates, plant-based fillers, and combinations thereof.

[0097] As described above, the acoustic member 10 may have a porous layer, and the average fiber-to-fiber distance of the porous layer may be greater than 0 μm and less than or equal to 100 μm. The average fiber-to-fiber distance of the acoustic member 10 may be greater than or equal to 1 μm and less than or equal to 1000 μm, greater than or equal to 10 μm and less than or equal to 500 μm, or greater than or equal to 20 μm and less than or equal to 300 μm. Furthermore, the average inter-fiber distance of the acoustic member 10 may be any of 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 7 μm, 10 μm, 11 μm, 12 μm, 15 μm, 17 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 150 μm, 170 μm, 200 μm, 250 μm, 300 μm, 400 μm, 450 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, and 1000 μm.

[0098] As mentioned above, the acoustic member 10 may be made of fine particles. In this case, the average particle size of the acoustic member 10 may be 1 μm or more and 1000 μm or less, 50 μm or more and 800 μm or less, or 100 μm or more and 700 μm or less. The average particle size of the acoustic member 10 may be less than 1 μm or more than 1000 μm. The average grain size of the acoustic member 10 may be any of 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 150 μm, 170 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, and 1000 μm.

[0099] Exemplary thicknesses of the acoustic member 10 may be 1 μm or more and 10 cm or less, 30 μm or more and 1 cm or less, or 50 μm or more and 500 μm or less. The thickness of the acoustic member 10 may be any of 1 μm, 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 100 μm, 200 μm, 500 μm, 1 mm, 2 mm, 5 mm, 10 mm, 20 mm, 50 mm, 70 mm, and 100 mm.

[0100] When the acoustic member 10 contains the above-mentioned filler, it is possible to improve the sound absorption performance for various frequency bands. The frequency band of sound in which the acoustic member 10 exhibits high sound absorption performance may be, for example, 50 Hz or more and 500 Hz or less, or 500 Hz or more. The sound frequencies that the acoustic member 10 targets are 50 Hz, 55 Hz, 60 Hz, 65 Hz, 70 Hz, 75 Hz, 80 Hz, 85 Hz, 90 Hz, 95 Hz, 100 Hz, 105 Hz, 110 Hz, 115 Hz, 120 Hz, 125 Hz, 130 Hz, 135 Hz, 140 Hz, 145 Hz, 150 Hz, 155 Hz, 160 Hz, 165 Hz, 170 Hz, 175 ... Hz, 180Hz, 185Hz, 190Hz, 195Hz, 200Hz, 230Hz, 240Hz, 250Hz, 260Hz, 270Hz, 280Hz, 290Hz, 300Hz, 400Hz, 500Hz, 700Hz, 1000Hz, 2000Hz, 3000Hz, 4000Hz, 5000Hz, 7000Hz, and 10000Hz.

[0101] The acoustic member 10 may comprise a nonwoven fabric or may comprise fiberglass, which is typically made by fusing silica or other minerals in a furnace, which may be extruded through a spinneret containing small orifices to produce a molten stream that is then cooled by directing a stream of hot air through it.

[0102] Next, the effects obtained from the ventilation system 1 and acoustic member 10 according to the embodiment will be described. As illustrated in Fig. 4, in the ventilation system 1, the acoustic member 10 has a membrane-shaped main body 11 that faces an exhaust port E formed in a wall W. Therefore, by facing the main body 11 of the acoustic member 10 to the exhaust port E, the acoustic member 10 can effectively absorb and block sound from the exhaust port E, thereby improving sound absorption and sound blocking properties.

[0103] The main body 11 of the acoustic member 10 divides the internal space S of the ventilation system 1 into a first air chamber S1 communicating with the exhaust port E and a second air chamber S2 into which air K flows from the inlet 2c of the ventilation system 1. By dividing the first air chamber S1 and the second air chamber S2 in this way, the sound T from the exhaust port E can be absorbed and blocked more effectively. In addition, a part 11b of the main body 11 of the acoustic member 10 is fixed to the peripheral part 12 of the acoustic member 10, and the remaining part 11c of the outer edge of the main body 11 is a communication part 13 that communicates the first air chamber S1 and the second air chamber S2. Therefore, the air K that flows into the second air chamber S2 from the inlet 2c can be circulated to the exhaust port E via the communication part 13 and the first air chamber S1. Therefore, it is possible to prevent the flow of the air K from being obstructed.

[0104] As illustrated, the ventilation system 1 includes an inner member 2 that defines the second air chamber S2 together with the main body 11, and the inlet 2c may be formed in the inner member 2. In this case, the inlet 2c through which the air K flows into the second air chamber S2 can be formed in the inner member 2 attached to the inside of the wall W.

[0105] The inner member 2 may be connected to the wall W. In this case, by attaching the inner member 2 to the wall W, the ventilation system 1 can be easily installed on the wall W.

[0106] As described above, the lower portion (part 11b) of the outer edge of the main body 11 may be fixed to the peripheral edge 12. In this case, the lower portion of the main body 11 is fixed and the communication portion 13 is formed in the upper portion of the main body 11, so that the air K flowing in from the inlet 2c can be guided to the exhaust port E via the communication portion 13 formed in the upper portion.

[0107] In the communication section 13, the air K that has flowed into the second air chamber S2 from the inlet 2c may flow into the first air chamber S1, and in the exhaust port E, the air K that has flowed into the first air chamber S1 from the communication section 13 may be discharged from the first air chamber S1. In this case, the air K that has flowed into the second air chamber S2 from the inlet 2c can be guided to the exhaust port E via the communication section 13 and the first air chamber S1, so that a flow of the air K is formed and obstruction of the flow of the air K can be avoided.

[0108] For example, the main body 11 may be in the form of a film extending in the first direction D1 and the second direction D2, the wall W and the main body 11 may be arranged along a third direction D3 intersecting both the first direction D1 and the second direction D2, the exhaust port E and the inlet 2c may be formed on one side of the first direction D1, and the communication portion 13 may be formed on the other side of the first direction D1. As another example different from this example, the exhaust port E and the inlet 2c may be formed on one side of the second direction D2, and the communication portion 13 may be formed on the other side of the second direction D2. That is, the exhaust port E and the inlet 2c may be formed on one side of either the first direction D1 or the second direction D2, and the communication portion 13 may be formed on the other side of either the first direction D1 or the second direction D2. In this case, it is possible to form a detour extending in the first direction D1 or the second direction D2 between the exhaust port E, the communication portion 13, and the inlet 2c for the sound T from the exhaust port E. Therefore, the sound absorption and sound insulation properties against the sound T from the exhaust port E can be improved.

[0109] For example, one of the first direction D1 and the second direction D2 is a lower side, and the other of the first direction D1 and the second direction D2 is an upper side. In this case, it is possible to form a detour for the sound T from the exhaust port E that extends in a direction intersecting the third direction D3 (for example, a vertical direction) between the exhaust port E, the communication portion 13, and the inlet 2c.

[0110] The wall W may include an outer wall W2 and an inner wall W1, and the exhaust port E may be formed in the outer wall W2. At least a part of the peripheral portion 12 may be attached to the inner wall W1. In this case, the ventilation system 1 can be attached to the wall W including the outer wall W2 and the inner wall W1, and the exhaust port E is formed in the outer wall W2.

[0111] The outer wall W2 may be an outer panel of the automobile, the inner wall W1 may be an inner panel of the automobile, and the exhaust port E may be a vent duct of the automobile. In this case, the sound absorption and sound insulation properties of the automobile equipped with the outer panel, the inner panel, and the vent duct can be improved so as not to impede the flow of the air K.

[0112] The inner member 2 may be a luggage side trim that covers the inside of the wall W. In this case, by attaching the luggage side trim to the inside of the wall W, the ventilation system 1 can be easily installed on the inside of the wall W.

[0113] The acoustic member 10 may include a nonwoven fabric, in which case the structure of the acoustic member 10 can be simplified.

[0114] The acoustic member 10 may include a skin layer 10d and a core layer 10b containing a material different from that of the skin layer 10d. In this case, the sound absorption properties of the acoustic member can be further improved by absorbing sound in both the core layer 10b and the skin layer 10d.

[0115] The acoustic member 10 includes a porous layer and a porous carbon layer in contact with the porous layer, and the porous carbon layer is 0.1 mm thick. 2 / g or more and 10000m 2 / g or less, and the acoustical member 10 may have an airflow resistance value of greater than or equal to 100 MKS Rayls and less than or equal to 5000 MKS Rayls.

[0116] The acoustic member 10 comprises a porous layer and a porous material having an average grain size of 1 μm or more and 1000 μm or less and a grain size of 0.1 μm or less. 2 / g or more and 800m 2 / g or less, and the acoustical member 10 may have an airflow resistance value of greater than or equal to 100 MKS Rayls and less than or equal to 8000 MKS Rayls.

[0117] An acoustic member 10 according to the embodiment includes a membrane-like main body portion 11 and a peripheral portion 12 that is connected to a part 11b of the outer edge of the main body portion 11 and is formed so as to surround the main body portion 11.

[0118] In the acoustic member 10, by facing the membrane-shaped main body 11 to the exhaust port E, the main body 11 can effectively absorb and insulate the sound T from the exhaust port E, thereby improving the sound absorption and sound insulation. The acoustic member 10 includes a peripheral portion 12 that is connected to a part 11b of the outer edge of the main body 11 and is formed to surround the main body 11, so that the remaining part 11c of the outer edge of the main body 11 can be opened when the peripheral portion 12 is attached to a wall W or the like. This open portion can be used as a passage for the air K, so that the flow of the air K is not hindered. The peripheral portion 12 may be formed by hot pressing. The peripheral portion 12 may also be formed by a frame. In this case, the peripheral portion 12 can be easily formed.

[0119] The main body 11 may divide a predetermined space into a first air chamber S1 and a second air chamber S2, and a part 11b of the outer edge of the main body 11 may be fixed to the peripheral edge 12. The remaining part 11c of the outer edge of the main body 11 may be open or may be a communication part 13 that communicates the first air chamber S1 and the second air chamber S2. In this case, the main body 11 faces the exhaust port E and divides a predetermined space into the first air chamber S1 and the second air chamber S2, so that the sound T from the exhaust port E can be effectively absorbed and blocked. In addition, since the remaining part 11c of the outer edge of the main body 11 is a communication part 13 that communicates the first air chamber S1 and the second air chamber S2, the inflowing air K can be circulated to the exhaust port E through the communication part 13. Therefore, the flow of the air K can be prevented from being obstructed.

[0120] The above describes the embodiment of the ventilation system and the acoustic member according to the present disclosure. However, the present disclosure is not limited to the above-mentioned embodiment. The present disclosure can be modified in various ways without changing the gist of the claims. That is, the shape, size, material, number and arrangement of each part of the ventilation system and the acoustic member can be appropriately changed without changing the gist of the above. For example, in the above-mentioned embodiment, an example was described in which the lower part of the outer edge of the main body part 11 is fixed to the peripheral part 12. For example, the peripheral part 12 may be provided on the entire circumference as viewed from the third direction D3, or may be provided only on a part of the circumference. For example, the acoustic member may have the peripheral part 12 present on the entire circumference and the communication part 13 formed by opening a hole. In this way, the shape of the peripheral part and the main body part of the acoustic member can be appropriately changed within the scope of the above-mentioned gist.

[0121] Next, various examples of the ventilation system and the acoustic member will be described. Note that the present disclosure is not limited to each example including the examples described later. First, the specifications of each of Examples 1 to 4 and Comparative Example 1 are shown below. Example 1 The acoustic member according to the first embodiment has a core layer and a skin layer provided on each of a pair of main surfaces of the core layer, similar to the acoustic member 10 described above. The acoustic member according to the first embodiment uses melt-blown fibers having a fiber diameter of 5 μm and a fiber density of 700 g / m per unit area, which are produced by a melt-blown process using polypropylene (PP) resin. 2 The porous particles are then spun to a surface area of ​​250 m 2 / g activated carbon 175g / m 2 The thickness of the acoustic member according to Example 1 was 15 mm, and the weight per unit area was 875 g / m 2The airflow resistance of the acoustic member was 5000MKS Rayls. The acoustic member according to Example 1 was attached to the first area A1 and the second area A2 of the wall W shown in Figs. 3 and 4 to form the ventilation system according to Example 1. The surface area of ​​the activated carbon was analyzed using AUTOSORB IQ (Quantachrome Instruments (Boynton Beach, Florida)). The surface area was determined by N2 adsorption at 77K. The airflow resistance was measured according to ASTM C-522-03 (Reproved 2009), "Standard Test Method for Airflow Resistance of Acoustical Materials". The instrument used for the measurement was PERMEAMETER Model Number GP-522-A available from POROUS Materials, Inc. (Ithaca, NY). The airflow resistance was calculated in Rayls (Pa·s / m).

[0122] Example 2 The acoustic member of Example 2 is made of 3M® Thinsulate® sound-absorbing insulation material TC3403. The acoustic member of Example 2 has a core layer and a skin layer provided on each of a pair of main surfaces of the core layer. The acoustic member of Example 2 includes a high-performance filling material. The acoustic member of Example 2 includes microfibers and staple fibers that are intricately entangled. The acoustic member of Example 2 has a thickness of 41 mm and a weight per unit area of ​​332 g / m. 2 The acoustic members according to the second embodiment were attached to the first area A1 and the second area A2 of the wall W shown in Figs.

[0123] Example 3 The acoustic member according to Example 3 is made of miscellaneous felt (Wake Sangyo Sound Absorbing Coarse Felt WSD007). The acoustic member according to Example 3 is made of a single layer of miscellaneous felt. The thickness of the acoustic member according to Example 3 is 8 mm, and the weight per unit area is 1000 g / m 2The acoustic members according to the third embodiment were attached to the first area A1 and the second area A2 of the wall W shown in Figs.

[0124] Example 4 The acoustic member according to Example 4 was a rubber plate (Waki Sangyo NBR rubber sheet NBR310005). The thickness of the acoustic member according to Example 4 was 3 mm, and the weight per unit area was 4300 g / m 2 The acoustic members according to the fourth embodiment were attached to the first area A1 and the second area A2 of the wall W shown in Figs.

[0125] Comparative Example 1 Comparative Example 1 was a ventilation system that did not have an acoustic component.

[0126] An experiment was carried out to compare acoustic sensitivity for automobiles equipped with vehicle bodies having the ventilation systems of each of the above Examples 1 to 4 and Comparative Example 1. The automobiles equipped with the ventilation systems of each of Examples 1 to 4 and Comparative Example 1 were placed in an anechoic chamber, and static evaluation of acoustic sensitivity was carried out inside the anechoic chamber.

[0127] As shown in Fig. 6 and Fig. 7, a speaker Y was attached as a sound source on the inside of the rear wheel of the automobile, and two microphones X were attached inside the body of the automobile. The microphones X were placed around the inlet of the luggage side trim and above the left rear seat (at the position of the passenger's ear). In each of Examples 1 to 4 and Comparative Example 1, excitation (white noise) was performed by the speaker Y, which is a volume velocity sound source, and the sound was detected by the microphone X, which is a 1 / 2 microphone. The detected sound was subjected to frequency analysis (CPB analysis: 400 to 5000 Hz) using an FFT analyzer, and the noise level for each frequency was measured. The volume velocity sound source was an OmniSource Sound Source Type 4295 manufactured by B&K, and the 1 / 2 microphone was a 4189-A-021 manufactured by B&K. The FFT analyzer was a PULSE manufactured by B&K.

[0128] The results of the above-mentioned noise measurements for the ventilation systems of Examples 1 to 4 and Comparative Example 1 are shown in Figures 8 and 9. Figure 8 shows the noise measurement values ​​taken by a microphone X placed in the left rear seat, and Figure 9 shows the noise measurement values ​​taken by a microphone X placed around the inlet of the luggage side trim.

[0129] 8, it was found that in the left rear seat, the ventilation systems of Examples 1 to 4 equipped with an acoustic member had higher sound absorption and sound insulation in the frequency band of 400 Hz to 5000 Hz than the ventilation system of Comparative Example 1. In the frequency band of 400 Hz to 5000 Hz, the average noise value of Example 1 was 41.30 dB, the average noise value of Example 2 was 41.59 dB, the average noise value of Example 3 was 41.94 dB, the average noise value of Example 4 was 42.22 dB, and the average noise value of Comparative Example 1 was 43.44 dB.

[0130] Thus, it was found that the ventilation system of Example 1 can reduce noise by about 2.1 dB compared to the ventilation system of Comparison Example 1, the ventilation system of Example 2 can reduce noise by about 1.9 dB compared to the ventilation system of Comparison Example 1, the ventilation system of Example 3 can reduce noise by about 1.5 dB compared to the ventilation system of Comparison Example 1, and the ventilation system of Example 4 can reduce noise by about 1.2 dB compared to the ventilation system of Comparison Example 1.

[0131] As shown in Fig. 9, it was found that around the inlet of the luggage side trim, the ventilation systems of Examples 1 to 3 equipped with a fiber acoustic member had higher sound absorption and sound insulation in the frequency band of 400 Hz to 5000 Hz than the ventilation system of Comparative Example 1. In Example 4 equipped with a rubber plate acoustic member, the noise value was sometimes high depending on the frequency, but was generally better than Comparative Example 1.

[0132] In the frequency band of 400 Hz to 5000 Hz, the average noise value of Example 1 was 57.50 dB, the average noise value of Example 2 was 58.06 dB, the average noise value of Example 3 was 57.70 dB, the average noise value of Example 4 was 58.82 dB, and the average noise value of Comparative Example 1 was 60.71 dB.

[0133] Thus, it was found that the ventilation system of Example 1 can reduce noise by about 3.2 dB more than the ventilation system of Comparative Example 1, the ventilation system of Example 2 can reduce noise by about 3 dB more than the ventilation system of Comparative Example 1, the ventilation system of Example 3 can reduce noise by about 2.6 dB more than the ventilation system of Comparative Example 1, and the ventilation system of Example 4 can reduce noise by about 1.9 dB more than the ventilation system of Comparative Example 1. From the above, it was found that the ventilation systems of Examples 1 to 4, which have an acoustic member similar to the acoustic member 10 shown in Fig. 4, can improve sound absorption and sound insulation. [Explanation of symbols]

[0134] 1...ventilation system, 2...inner member, 2b...convex portion, 2c...inlet, 10...acoustic member, 10b...core layer, 10c...main surface, 10d...skin layer, 11...main body, 11b...part, 11c...remaining portion, 12...periphery, 13...communicating portion, A1...first region, A2...second region, B...vehicle body, D1...first direction, D2...second direction, D3...third direction, E...exhaust port, E1...short side, E2...long side, F...flap, K...air, S...internal space, S1...first air chamber, S2...second air chamber, T...sound, W...wall, W1...inner wall, W13...convex portion, W2...outer wall, W21...first wall portion, W22...second wall portion, W3...rear bumper, X...microphone, Y...speaker.

Claims

1. 1. A wall-mounted ventilation system having an inlet and an outlet, An acoustic member that absorbs sound from the exhaust port, The acoustic member is a film-shaped main body portion facing the exhaust port; a periphery portion connecting the body portion and the wall to each other and disposed to surround the body portion; The main body defines a first air chamber communicating with the exhaust port and a second air chamber into which air flows in from the inlet, A portion of an outer edge of the main body is fixed to the peripheral edge portion, The remaining portion of the outer edge of the main body portion is open and serves as a communication portion that communicates the first air chamber and the second air chamber, The main body portion is in the form of a film extending in a first direction and a second direction, the wall and the main body are aligned along a third direction intersecting both the first direction and the second direction, the exhaust port and the inlet are formed on one side of either the first direction or the second direction, The communication portion is formed on the other side of either the first direction or the second direction. Ventilation system.

2. an inner member defining the second chamber together with the main body; The inlet is formed in the inner member.

2. The ventilation system of claim 1.

3. The inner member is connected to the wall.

3. The ventilation system of claim 2.

4. A lower portion of the outer edge of the main body is fixed to the peripheral edge. A ventilation system according to any one of claims 1 to 3.

5. In the communication portion, the air that has flowed into the second chamber from the inlet flows into the first chamber, At the exhaust port, the air that has flowed into the first chamber from the communication portion is exhausted from the first chamber. A ventilation system according to any one of claims 1 to 4.

6. One side of the first direction or the second direction is a lower side, The other side of either the first direction or the second direction is an upper side. A ventilation system according to any one of claims 1 to 5.

7. The wall includes an outer wall and an inner wall, The exhaust port is formed in the outer wall, At least a portion of the periphery is attached to the inner wall. A ventilation system according to any one of claims 1 to 6.

8. The outer wall is an outer panel of an automobile, and the inner wall is an inner panel of the automobile, The exhaust outlet is a vent duct of the vehicle.

8. A ventilation system according to claim 7.

9. The inner member is a luggage side trim that covers the inner side of the wall. A ventilation system according to claim 2 or 3.

10. The acoustic member includes a nonwoven fabric. A ventilation system according to any one of claims 1 to 9.

11. The acoustic member includes a skin layer and a core layer including a material different from that of the skin layer. A ventilation system according to any one of claims 1 to 10.

12. The acoustic member includes a porous layer and The porous layer is in contact with the porous carbon, and the porous carbon layer is 0.1 m ２ / g or more and 10000m ２ a non-uniform filler having an average surface area of ​​less than or equal to 1 / g; The acoustic member has an airflow resistance of 100 MKS Rayls or more and 5000 MKS Rayls or less. A ventilation system according to any one of claims 1 to 11.

13. The acoustic member includes a porous layer and The porous layer is provided with an average particle size of 1 μm or more and 1000 μm or less, and the average particle size is less than 0.1 μm. ２ / g or more and 800m ２ a non-uniform filler having an average surface area of ​​less than or equal to 1 / g; The acoustic member has an airflow resistance of 100 MKS Rayls or more and 8000 MKS Rayls or less. A ventilation system according to any one of claims 1 to 11.

Images