Pumps – Successive stages – Reciprocating rigid stages
Patent
1995-11-27
1998-07-21
Thorpe, Timothy
Pumps
Successive stages
Reciprocating rigid stages
417400, F04B 2500, F04B 3502
Patent
active
057826129
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device to compress gas having a housing, a separating element mounted in the housing and a piston driven between two dead center positions.
BACKGROUND OF THE INVENTION
Hydraulic gas compressors are commercially available in a number of structural and operational embodiments. Essentially, two different structural embodiments are recognized, i.e., motor-powered and hydraulic/pneumatically driven compressors. Known gas compressors, also called compressors, require a large installation depending on the output required, and are of complex construction, producing the high assembly and maintenance outlay with the installation. The manufacturing, installation and maintenance costs are also high.
A known device for compression of gas is disclosed in European 0 193 498 A2. That device has three pistons connected with one another by a piston rod moved reciprocally within a housing/bushing by a hydraulic drive. Low pressure gas is compressed in the end area of the compressor to generate higher pressure gas. The known gas compressor alternatively performs a two-stage compression process on either side of the device. The separating element of the known device is formed by two housing walls, between which is movably arranged the central piston. Gas introduced at lower pressure is discharged alternately into the higher pressure compression chambers. Since the compression process has only two cycles, very high pressures cannot be attained.
In other known hydraulic gas compressor as in European 0 064 177 B1, the compressor requires two housings/bushings for compression units divided into at least three sections in the longitudinal direction to provide a minimum of three compression stages. A central area is divided into two chambers by a hydraulically operated piston. Additionally, two lateral gas compression areas are located in turn on the sides of the central area. The lateral areas have one piston each controlled by the hydraulically operated piston. Thus, the first compression unit includes both the first and the third compression stages and the second compression unit includes at least the second compression stage. For a three-stage gas compression cycle, required to achieve higher pressure, two housings and a total of five pistons are required, separated from one another at some spacing. In addition to their compression functions, the pistons are subjected to wear because of their seals, and thus, affect the reliability and safety of operation.
A gas compressor of this type is also disclosed in U.S. Pat. No. 4,345,880, and has a piston movable in stages by a drive arrangement. The piston facilitates a four-stage compression process. A hydraulically operated cylinder serves as a separating element along which the piston is guided to move in the housing/bushing. The working piston subdivides the hydraulic cylinder into two fluid chambers of variable volume. The volumes can be acted upon with fluid pressure to move the separating element alternately between two guides arranged separated from one another. The movable housing part of the separating element, configured as hydraulic cylinder, is connected securely with the separating element for the drive of the compressing piston. The hydraulic cylinder surrounds the separating element with a cylindrical sealed covering surface, while retaining some distance therefrom. Because of this configuration, the known gas compressor requires a large installation especially transversely. Because of the multiplicity of parts subjected to wear generated by the movable components, the operational security and safety is negatively affected and increased maintenance outlay is required.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide a gas compressor which can produce high compression levels with low assembly and maintenance costs and with a safe operation.
The foregoing objects are basically obtained by a gas compressor, comprising a housing, a separating element stationarily mounted in the housing,
REFERENCES:
patent: Re13645 (1913-11-01), Stone
patent: 4111609 (1978-09-01), Braun
patent: 4334833 (1982-06-01), Gozzi
patent: 4345880 (1982-08-01), Zanarini
patent: 4390322 (1983-06-01), Budzich
patent: 4818192 (1989-04-01), Korthaus
Hydac Technology GmbH
Korytwyk Peter G.
Thorpe Timothy
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