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公开(公告)号：US06052863A
公开(公告)日：2000-04-25
申请号：US546116
申请日：1995-10-20
CPC分类号： A47L9/0081 , A47L5/38
摘要： A central vacuum cleaner having an air flow exhaust pipe is provided with a muffler comprising an elongated muffler pipe having a reduced diameter inlet and a reduced diameter outlet and a noise reducing foam liner disposed in the muffler pipe between the inlet and outlet. The foam liner includes a smooth inner surface that is generally flush with inner surfaces of the inlet and outlet. The foam liner comprises a combustion modified polyether polyurethane foam tube inserted in the muffler pipe between the inlet and outlet.
摘要翻译： 具有气流排气管的中央真空吸尘器设置有消声器，该消声器包括细长的消声器管，其具有直径减小的入口和减小直径的出口以及设置在入口和出口之间的消音管中的降噪泡沫衬垫。 泡沫衬里包括通常与入口和出口的内表面齐平的平滑内表面。 泡沫衬里包括在入口和出口之间插入消声器管中的燃烧改性聚醚聚氨酯泡沫管。
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公开(公告)号：US5737797A
公开(公告)日：1998-04-14
申请号：US563287
申请日：1995-11-28
申请人： Stephen P. Rittmueller , Douglas E. Johnson , Steven D. Lauritsen , J. Adin Mann, III , David K. Holger
发明人： Stephen P. Rittmueller , Douglas E. Johnson , Steven D. Lauritsen , J. Adin Mann, III , David K. Holger
CPC分类号： A47L9/0081 , A47L5/38
摘要： A central vacuum unit having an acoustic damping system is provided. The central vacuum unit includes a canister having a sidewall forming a hollow interior and a lid closing an end of the sidewall, a vacuum motor within the canister which emits noise during operation, at least one cooling air inlet for admitting cooling air into the hollow interior, and at least one cooling air outlet in the sidewall for exhausting the cooling air from the hollow interior. Additionally, the sidewall has an exhaust port and the motor has an exhaust pipe extending through the exhaust port. The acoustic damping system includes an acoustic damping tunnel, an acoustic damping canopy, and an exhaust port seal. The acoustic damping tunnel is within the hollow interior and forms a pathway between the hollow interior and the cooling air outlet. The pathway is lined with a sound absorbing material so that the tunnel reduces noise emitted from the hollow interior through the cooling outlet. The acoustic damping canopy is attached to the canopy over the cooling air inlet. The canopy has an inlet and forms a serpentine pathway between the canister cooling air inlet and said canopy inlet to reduce noise emitted from the hollow interior through the canister cooling air inlet. The exhaust port seal covers the exhaust port to reduce noise emitted from the hollow interior through the exhaust port. The exhaust port seal preferably includes flexible foam bonded to the canister sidewall.
摘要翻译： 提供具有声阻尼系统的中央真空单元。 所述中央真空单元包括具有侧壁的罐，所述侧壁形成中空内部，并且盖封闭所述侧壁的端部，所述罐内的真空马达在运行期间发出噪声;至少一个冷却空气入口，用于将冷却空气进入所述中空内部 以及侧壁中的至少一个冷却空气出口，用于从中空内部排出冷却空气。 此外，侧壁具有排气口，并且电动机具有延伸穿过排气口的排气管。 声阻尼系统包括声阻尼隧道，声阻尼罩和排气口密封。 声阻尼通道在中空内部，并形成中空内部和冷却空气出口之间的通路。 该通道衬有吸声材料，使得隧道减少从中空内部通过冷却出口发出的噪声。 声阻尼罩连接到冷却空气入口的顶盖上。 顶篷具有入口并且在罐冷却空气入口和所述顶盖入口之间形成蛇形通道，以减少通过罐冷却空气入口从中空内部发出的噪声。 排气口密封件覆盖排气口，以减少通过排气口从中空内部发出的噪声。 排气口密封件优选地包括粘合到罐侧壁的柔性泡沫。
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公开(公告)号：US4655086A
公开(公告)日：1987-04-07
申请号：US728890
申请日：1985-04-30
摘要： Sound intensity is determined by simultaneously measuring instantaneous acoustic pressure and instantaneous particle velocity at a single point. A condenser microphone having a vibrating diaphragm generates an output voltage proportional to the instantaneous acoustic pressure. A laser Doppler vibrometer measures the velocity of the vibrating diaphragm and a Doppler frequency tracker converts the velocity measurement into another output voltage which is proportional to the instantaneous acoustic particle velocity. The sound intensity is then calculated from the known components.
摘要翻译： 通过同时测量单个点处的瞬时声压和瞬时粒子速度来确定声强。 具有振动膜的电容麦克风产生与瞬时声压成比例的输出电压。 激光多普勒振动计测量振动膜的速度，多普勒频率跟踪器将速度测量转换成与瞬时声粒子速度成比例的另一输出电压。 然后从已知组件计算声强。
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