Process and a device for increasing the efficiency of compression devices

US5316448A · kind A · utility

Assignee

• Linde GmbH · DE

Inventors

• Bruno Ziegler · Mühlacker, DE
• Hermann Herzog · Hamburg, DE
• Udo Wagner · Neuhemsbach, DE

Key dates

• Filing date: Oct 19, 1992
• Grant date: May 31, 1994
• Expiry date: Oct 19, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C28/26
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In cryogenic applications a compression device circulates a fluid, such as helium, in a closed cooling circuit. The compression device includes at least one compressor, preferably a helical compressor, with a bypass valve connected in parallel thereto, which serves to decompress the compressed fluid. The suction pressure is measured with a pressure measuring device and is supplied to a control device, which controls the position of a powered valve spool of the compressor and also the position of the bypass valve. In order to achieve a high control performance with small bypass losses for load cases which are hard to predetermine, the positions of bypass valve and power valve spool are adjusted so that a fluid flow flows as a control reserve through the bypass valve and is on the order of a fraction of the total fluid flow.