Conveners
C1Po1C: Components II: Cold Compressors & Expanders
- Carl Bunge (MIT)
- John Brisson (MIT)
Large-scale helium cryogenic refrigeration facilities are indispensable equipment for many cutting-edge researches, and the cold compressor is the most advantageous pressurization scheme in superfluid helium systems with capacity of more than 200 watts. Due to the extremely low operating temperature zone of the cold compressor, the efficiency of the compression process decreases as the...
An experimental helium liquefier/refrigerator, using ultra high speed cryogenic turbo-expanders is designed and developed in Technical Institute of Physics and Chemistry (TIPC), and liquefaction rate of around 42 L/hr and refrigeration capacity of around 130W@4.5K is achieved. The turbo-expander constitutes the most critical component of a helium liquefier/refrigerator causing that the turbine...
The characteristics of gas lubrication of tilting pad gas bearing make it have higher load capacity and lower friction force, and it is widely used in the field of high-speed turbine machinery. Especially in the special environment of low temperature, dynamic pressure gas bearings do not need additional bearing gas system to assist, greatly simplifying the system structure. However, the...
After nearly 20 years of long-term operation, the variable frequency driver (VFD) of the Main Cryogenic Plant 1 (MCP1) suffered a major failure after a routine shutdown in September 2021. After inspection and replacement of damaged parts, the cause of the failure cannot be found. And some normal spare parts were damaged. Since most of the spare parts are out of production and we still have two...
