公开(公告)号：US4262770A

公开(公告)日：1981-04-21

申请号：US945261

申请日：1978-09-22

申请人： Andrew R. Spencer

发明人： Andrew R. Spencer

IPC分类号： B21F27/18 ,  F01N1/08 ,  F16L55/027 ,  F01N1/24 ,  B65H81/00

CPC分类号： F01N1/082 ,  B21F27/18 ,  F16L55/02745 ,  Y10T428/12333 ,  Y10T428/12479 ,  Y10T428/12493 ,  Y10T428/12986 ,  Y10T428/249922

摘要： A porous acoustic element is disclosed having a configuration comprised of individual cross-wound porous layers of widely varying porosity, with transition plenum layers interposed therebetween having a configuration so as to prevent formation of blockages and small area openings which would be created by a direct overlay winding of differing pitch. The porosity of each wound layer increases in successive layers to compensate for expansion of the gas as it flows through the element. The resulting porous element allows gaseous flow therethrough, with maximum pressure energy dissipation and controlled velocity to minimize aerodynamic noise created by flow through valves and other flow restrictions. A specific embodiment is disclosed in which the porous layers are created by variable pitch wire ribbon cross windings and the transition layers are provided by wire mesh having relatively large openings.

摘要翻译： 公开了一种多孔声学元件，其具有由具有广泛变化的孔隙率的单个交叉缠绕多孔层构成的构造，其间插入有过渡气室层，具有这样的构造，以防止形成由直接覆盖物产生的堵塞和小面积开口 不同音调的缠绕。 每个缠绕层的孔隙率连续增加，以补偿气体在流过元件时的膨胀。 所得到的多孔元件允许气体流过其中，具有最大的压力能量耗散和受控的速度，以最小化由流过阀门和其他流量限制而产生的空气动力学噪声。 公开了一种具体实施例，其中多孔层由可变间距线带状交叉绕组产生，并且过渡层由具有相对较大开口的丝网提供。

公开(公告)号：US4150696A

公开(公告)日：1979-04-24

申请号：US709165

申请日：1976-07-26

申请人： Gerd E. A. Meier ,  Winfried Hiller

发明人： Gerd E. A. Meier ,  Winfried Hiller

IPC分类号： F02B3/06 ,  F15D1/02 ,  F16K47/02 ,  F16L55/027

CPC分类号： F16L55/02763 ,  F15D1/02 ,  F16K47/02 ,  F16L55/027 ,  F16L55/02718 ,  F16L55/02727 ,  F16L55/02745 ,  F02B3/06 ,  Y10S521/902

摘要： A flow passage for a flowable medium is bounded by a wall, and located in e flow passage are one or more devices which suppress the occurrence of such flow conditions in the medium as would tend to cause the development of vibrations in the flowable medium and in the walls surrounding the flow passage.

摘要翻译： 用于可流动介质的流动通道由壁限制，并且位于流动通道中的是一种或多种装置，其抑制介质中这种流动状况的发生，这将倾向于引起可流动介质中的振动的发展，并且 围绕流动通道的墙壁。

公开(公告)号：US3823743A

公开(公告)日：1974-07-16

申请号：US19214671

申请日：1971-10-26

申请人： DUNLAP HOLDINGS LTD

发明人： KING C

IPC分类号： F16L55/027 ,  F16L55/04 ,  F15D1/00

CPC分类号： F16L55/02745 ,  F16L55/04

摘要： A pressure reducing device comprises an inlet for high pressure gas, an outlet for low pressure gas and a path therebetween for flow of gas from inlet to outlet, said path including at least one porous baffle having an inner portion made of porous material disposed in an inner zone of said path and an outer portion comprising a fibrous medium disposed in an outer zone of said path, the inner portion having a lower flow resistance than the outer portion. The porous materials used for the inner portion of the baffle include: layers of gauze, expanded metal, sintered metal, ceramic foams and plastics foams such as rigidified foams. The fibrous materials used for the outer portion of the baffle include; spun mineral fibers, natural fibers and glass wool.

摘要翻译： 减压装置包括用于高压气体的入口，用于低压气体的出口和用于从入口到出口的气体流动的路径，所述路径包括至少一个多孔挡板，其具有由多孔材料制成的内部部分 所述路径的内部区域和外部部分包括布置在所述路径的外部区域中的纤维介质，所述内部部分具有比所述外部部分更低的流动阻力。 用于挡板内部的多孔材料包括：纱布，多孔金属，烧结金属，陶瓷泡沫和诸如硬化泡沫的塑料泡沫层。 用于挡板外部的纤维材料包括： 纺织矿物纤维，天然纤维和玻璃棉。