公开(公告)号：US20240280290A1

公开(公告)日：2024-08-22

申请号：US18626454

申请日：2024-04-04

Applicant: FUJIFILM Corporation

Inventor： Shinya HAKUTA ,  Shogo YAMAZOE ,  Yoshihiro SUGAWARA ,  Yuichiro ITAI

IPC: F24F13/24 ,  F24F13/02

CPC classification number: F24F13/24 ,  F24F13/02

Abstract: Provided is an air passage type silencer that can reduce pressure loss even in a case where the flow rate of a gas flowing in the air passage type silencer is high. An air passage type silencer includes an inlet-side ventilation pipe, an expansion portion that communicates with the inlet-side ventilation pipe and of which a cross-sectional area is larger than a cross-sectional area of the inlet-side ventilation pipe, and an outlet-side ventilation pipe that communicates with the expansion portion and of which a cross-sectional area is smaller than the cross-sectional area of the expansion portion. A level difference d satisfies Equation (1): d≥100 μm, satisfies Equation (2): d≤25×Sa+193 μm in a case where an arithmetic average height Sa is equal to or smaller than 50 μm, and satisfies Equation (3): d≤1450 μm in a case where the arithmetic average height Sa exceeds 50 μm, where Sa (μm) is an arithmetic average height of a surface on a central side in the expansion portion and d (μm) is an average value of level differences between a ventilation pipe interior wall and the surface on the central side at at least one of a connection portion between the expansion portion and the inlet-side ventilation pipe or a connection portion between the expansion portion and the outlet-side ventilation pipe.

公开(公告)号：US20240255176A1

公开(公告)日：2024-08-01

申请号：US18631467

申请日：2024-04-10

Applicant: FUJIFILM Corporation

Inventor： Shogo YAMAZOE ,  Yuichiro ITAI ,  Shinya HAKUTA ,  Yoshihiro SUGAWARA ,  Tomohiro TAKAHASHI

IPC: F24F13/24

CPC classification number: F24F13/24 ,  F24F2013/242

Abstract: An object is to provide a ventilation system that can suppress generation of a pressure loss and wind noise in a silencer.
The ventilation system of the present invention has the silencer disposed at an intermediate position of a ventilation path. In a housing of the silencer, an in-housing ventilation path extending from an inlet opening to an outlet opening is surrounded by a sound absorbing member. The ventilation path has a first ventilation path that is adjacent to the inlet opening and that is continuous to the in-housing ventilation path and a second ventilation path that is adjacent to the outlet opening and that is continuous to the in-housing ventilation path. The farther from the in-housing ventilation path, the smaller a size of a cross section of at least one ventilation path of the first ventilation path or the second ventilation path. A size of a cross section of an end of at least one of the ventilation paths on an in-housing ventilation path side and a size of an opening of the inlet opening or the outlet opening, which is adjacent to the end, are identical to each other.

公开(公告)号：US20240003275A1

公开(公告)日：2024-01-04

申请号：US18469270

申请日：2023-09-18

Applicant: FUJIFILM Corporation

Inventor： Shinya HAKUTA ,  Shogo YAMAZOE ,  Yoshihiro SUGAWARA ,  Yuichiro ITAI

IPC: F01N1/04

CPC classification number: F01N1/04 ,  F01N2490/16 ,  F01N2490/18

Abstract: To provide an air passage type silencer and an acoustic impedance change structure of which the absorbance is high, that suppresses generation of a wind noise, and that has a high sound attenuation effect in a low-frequency band. Provided is an acoustic impedance change structure through which a sound propagates, the acoustic impedance change structure including at least in this order: a first impedance matching region that is connected to an inlet portion and in which an acoustic impedance gradually decreases; an acoustic impedance constancy region; and an outlet portion, in which Zcham

公开(公告)号：US20230408143A1

公开(公告)日：2023-12-21

申请号：US18363812

申请日：2023-08-02

Applicant: FUJIFILM Corporation

Inventor： Yoshihiro SUGAWARA ,  Shogo Yamazoe ,  Yuichiro Itai

IPC: F24F13/24

CPC classification number: F24F13/24 ,  F24F2013/242

Abstract: To provide a silencing structure and a silencing system having a high sound absorbance in a low frequency region. A silencing structure that is installed in a tubular member, the silencing structure includes a cavity portion, an opening portion through which the cavity portion communicates with the tubular member, and a closing portion that closes the cavity portion at a position facing the opening portion, in which a cross-sectional area of the cavity portion on a side of the opening portion is larger than a cross-sectional area of the cavity portion on a side of the closing portion.

公开(公告)号：US20210233507A1

公开(公告)日：2021-07-29

申请号：US17232816

申请日：2021-04-16

Applicant: FUJIFILM Corporation

Inventor： Yoshihiro SUGAWARA ,  Shogo YAMAZOE ,  Shinya HAKUTA ,  Akihiko OHTSU

IPC: G10K11/172 ,  G10K11/162

Abstract: Provided is a soundproof system having high sound silencing performance at a specific frequency while ensuring ventilation property. A soundproof system that silences a sound generated from a sound source which is disposed in a ventilation member having a ventilation passage, in which the sound generated from the sound source is at least one dominant sound of which a sound pressure at a specific frequency is a maximum value, at least a part of a high impedance space in which an acoustic impedance is higher than an average value of an acoustic impedance of the ventilation passage exists within a distance of ±0.25×λ of the sound source in a flow direction of the ventilation passage, the soundproof system includes a silencer that is disposed in the ventilation member and silences a sound in a frequency band including a frequency of the dominant sound, the silencer forms a low impedance space in which the acoustic impedance is lower than the average value of the acoustic impedance of the ventilation passage, and assuming that a center wavelength of the dominant sound is λ and m is a positive integer, a distance L between the high impedance space and the low impedance space satisfies (0.5×λ×m−0.2×λ)

公开(公告)号：US20210233505A1

公开(公告)日：2021-07-29

申请号：US17232835

申请日：2021-04-16

Applicant: FUJIFILM Corporation

Inventor： Shinya HAKUTA ,  Yoshihiro SUGAWARA ,  Akihiko OHTSU ,  Shogo YAMAZOE

IPC: G10K11/16 ,  G10K11/172 ,  F24F13/24

Abstract: An acoustic system includes a duct that has a function of causing a fluid to flow therein and has a tubular shape, an internal sound source that is disposed inside the duct on an upstream side or at an outer peripheral portion of the duct, which communicates with an inside of the duct on the upstream side, or an external sound source that is on an outside from an end portion of the duct, and a membrane-shaped member that is formed as a part of a wall of the duct and vibrates in response to sound. A structure including the membrane-shaped member and a rear surface closed space thereof causes acoustic resonance to occur, transmits the acoustic resonance from the sound source into the duct, and suppresses sound radiated from the other end portion of the duct on a downstream side. The external sound source is at a distance within a wavelength at a frequency of the acoustic resonance on the outside from the end portion of the duct. In the acoustic system, as a small membrane-type resonance structure is disposed in a flow passage horizontal direction, wind does not directly hit a membrane surface perpendicularly, and since the acoustic system does not have a through hole or a hole, wind noise can be eliminated.

公开(公告)号：US20200175954A1

公开(公告)日：2020-06-04

申请号：US16787361

申请日：2020-02-11

Applicant: FUJIFILM Corporation

Inventor： Akihiko OHTSU ,  Shinya HAKUTA ,  Shogo YAMAZOE ,  Yoshihiro SUGAWARA

IPC: G10K11/168 ,  E04B1/84 ,  B32B3/12 ,  G10K11/172

Abstract: Provided is a soundproof structure including a film-shaped member which has a plurality of through-holes penetrating in a thickness direction, in which in a hole radius distribution histogram function σ(r), in a case where the hole radius at which an opening ratio σ is maximum is denoted by r0, a total opening ratio of all the through-holes is denoted by σsum, and a thickness of the film-shaped member is denoted by t, an acoustic impedance Z0 of the film-shaped member represented by the following Expression (1) satisfies the following Expression (2) and the hole radius distribution histogram satisfies the following Expression (3). Z 0 = i  ωρ   t σ sum  ( 1 - 2  J 1  ( k ′  - i ) k ′  - i  J 0  ( k ′  - i ) ) - 1 + 2  ωρη 2  σ sum + i  1.7  ωρ   r 0 σ sum ( 1 ) Re  ( Z 0 ) ∫ r 0 ∞  σ  ( r )  dr ( 3 ) The soundproof structure can absorb sound with a high absorbance at a broad band.