Reciprocatory piston and cylinder machine

Details Reciprocatory piston and cylinder machine Reciprocatory piston and cylinder machine

1987-02-24

1988-12-13

Look, Edward K.

Pumps

Successive stages

Reciprocating rigid stages

92212, 92222, 92224, 92248, 417267, 417443, 417493, 417520, 417559, 417DIG1, F04B 300

Patent

active

047907266

ABSTRACT:
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).

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patent: 4315454 (1982-02-01), Knodel
patent: 4376472 (1983-03-01), Heyer et al.

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