Low capacity Linde-Hampson nitrogen liquefierA closed-cycle Linde-Hampson nitrogen liquefier was developed incorporating a new, non-clogging, demand flow Joule-Thomson nozzle. The flow area of the nozzle, a tapered annular orifice, is regulated by a very rugged load-sensitive differential thermal expansion scheme and by a manually adjustable micrometer mechanism. Labyrinth flow spoilers within the orifice provide turbulent voids which break up and clear contaminants from the flow. The system's four-stage compressor features sealed, oil-free compression spaces and a very compact nested piston configuration with a minimum of moving parts and drive complexity. The drive mechanism is a rolling Scotch yoke which minimizes piston side forces and seal wear for prolonged operating life. The closed-cycled system is controlled by an innovative load-responsive electronic feedback circuit which further reduces wear and input power.
Document ID
19920030775
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hedegard, K. (General Pneumatics Corp. Scottsdale, AZ, United States)
Atkins, E. (General Pneumatics Corp. Scottsdale, AZ, United States)