Cryogenic refrigeration apparatus
US4862694A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Jun 10, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B9/14
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A technique for producing a cold environment wherein warm fluid, e.g. at room temperature, from a compressor, is introduced under pressure into an input channel which is directly coupled to a displacement volume, the fluid being precooled in the input channel to a temperature lower than that of the input fluid. Fluid in the inner channel at or near the displacement volume is periodically pressurized to a high pressure. The displacement volume is then expanded so that the high pressure fluid flowing into the expanded volume is decreased from such high pressure to a substantially lower pressure, the temperature thereof being reduced to a substantially lower temperature for producing the cold environment. The low pressure, low temperature fluid flows into an output channel, preferably via a suitable valve and surge volume, for flow in the output channel at a substantially constant pressure. A direct heat exchange is provided between the input and output channels to provide the precooling of the input fluid and a warming of the fluid in the output channel to a temperature relatively close to, but below, the temperature of the input fluid. The warmed fluid exiting from the output channe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.