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公开(公告)号：US4699572A
公开(公告)日：1987-10-13
申请号：US820585
申请日：1986-01-21
IPC分类号： F04B53/10 , F04B25/02 , F04B37/14 , F04B39/04 , F04B39/08 , F04B39/10 , F04B53/14 , F16J9/26 , F16J9/28 , F04B25/00 , F16J1/02
CPC分类号： F04B25/02 , F04B37/14 , F04B39/04 , F04B39/08 , F04B39/102 , Y10S417/01
摘要： A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space between the piston (16) and cylinder (17) in lieu of oil or other liquid lubricant. The sealing means comprises a sleeve (102) of a low-friction material disposed under circumferential tension, and preferably also under longitudinal tension, on the cylindrical surface of the piston (16). Also disclosed is a reciprocatory differential piston and cylinder machine of particular prior construction having a one-way valve (42) in an exhaust port (30) ahead of a head portion (24) of the piston (16). The arrangement is such that, as the front face (28) of the piston head portion (24) approaches the cylinder end face (52), the front face (28) physically moves the one-way valve (42) so as to open the exhaust port (30).
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公开(公告)号：US4790726A
公开(公告)日：1988-12-13
申请号：US017405
申请日：1987-02-24
IPC分类号： F04B53/10 , F04B25/02 , F04B37/14 , F04B39/04 , F04B39/08 , F04B39/10 , F04B53/14 , F16J9/26 , F16J9/28 , F04B3/00
CPC分类号： F04B25/02 , F04B37/14 , F04B39/04 , F04B39/08 , F04B39/102 , Y10S417/01
摘要： A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space between the piston (16) and cylinder (17) in lieu of oil or other liquid lubricant. The sealing means comprises a sleeve (102) of a low-friction material disposed under circumferential tension, and preferably also under longitudinal tension, on the cylindrical surface of the piston (16). Also disclosed is a reciprocatory piston and cylinder machine of particular prior construction having a one-way valve (42) in an exhaust port (30) ahead of a head portion (24) of the piston (16). The arrangement is such that, as the front face of the piston head portion (24) approaches the closed cylinder end (52), the piston head portion 24 physically moves the one-way valve (42) so as to open the exhaust port (30).
摘要翻译： 特别适合用作真空泵的往复式活塞和气缸机器包括：气缸（17），在气缸（17）内相对可滑动地往复运动的圆柱形活塞（16）;以及用于基本上密封活塞（16） ）和气缸（17）代替油或其他液体润滑剂。 密封装置包括在活塞（16）的圆柱形表面上设置在周向张力下，优选地也在纵向张力下的低摩擦材料的套筒（102）。 还公开了特定的现有结构的往复式差动活塞和气缸机械，其具有在活塞（16）的头部（24）前方的排气口（30）中的单向阀（42）。 该装置使得当活塞头部（24）的前面（28）接近气缸端面（52）时，前表面（28）物理地移动单向阀（42）以便打开 排气口（30）。
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公开(公告)号：US4560327A
公开(公告)日：1985-12-24
申请号：US561869
申请日：1983-12-16
申请人： Eckhard Bez , John L. Farrant
发明人： Eckhard Bez , John L. Farrant
CPC分类号： F04B37/10 , F01B31/00 , F04B39/122 , F04B39/125
摘要： A porting and ducting arrangement for a pair of adjacent hollow cylinders includes respective pluralities of passages extending longitudinally in the walls of the cylinders. Each passage is provided with a port in communication with the interior of the associated cylinder. Plural recesses in the end of the cylinders or in a cover are each in communication with a separate passage or group of passages when the cover is applied to the cylinders. There are a pair of such recesses thereby associated with each cylinder and at least one recess of each pair is in communication with a recess of the other pair via duct means in the cover. Gasket means is retained between the cylinders and the cover to seal each recess of each pair of recesses with respect to the other recess of the pair.
摘要翻译： 用于一对相邻的中空圆柱的端口和管道装置包括在气缸的壁中纵向延伸的相应多个通道。 每个通道设置有与相关联的气缸的内部连通的端口。 当将盖应用于气缸时，在气缸的端部或盖中的多个凹槽各自与单独的通道或通道组连通。 存在一对这样的凹部，从而与每个气缸相关联，并且每对中的至少一个凹部通过盖中的管道装置与另一对的凹部连通。 垫圈装置保持在缸体和盖之间，以密封每对凹槽中相对于该对的另一个凹槽的每个凹部。
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公开(公告)号：US4854825A
公开(公告)日：1989-08-08
申请号：US019736
申请日：1987-02-27
申请人： Eckhard Bez , John L. Farrant
发明人： Eckhard Bez , John L. Farrant
CPC分类号： F04B25/00 , F04B37/14 , Y10S417/01
摘要： A vacuum pump includes two pairs of piston and cylinder assemblies mounted on opposite sides of a crankshaft in a common plane with the gas inlets for the first and second cylinders of a first pair of piston and cylinder assemblies being connected to the device to be evacuated and the gas outlets thereof being connected to a common outlet having a spring biased one-way valve controlling the outlet and to a passage connected to the inlet of a third cylinder in said second pair of piston and cylinder assemblies. The gas outlet of the third cylinder is connected to the inlet of the fourth cylinder and the gas outlet of the fourth cylinder is connected to the common outlet through spring biased one-way valves. Each cylinder is provided with a cylinder head having a pair of one-way valves controlling inlet and outlet ports wherein the one-way valve controlling the gas inlet port acts as a torque reduction valve to reduce the amount of torque necessary to move the piston away from the cylinder head on the initial stroke of the piston. Each cylinder is provided with a liner in the form of a sleeve having an hard wear resistant oxide coating thereon and each piston is provided with a coating of filled polytetrafluorethylene for the purpose of reducing friction.
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