Ultra-high temperature stability Joule-Thomson cooler with capability to accommodate pressure variations

Patent · Tue Jun 09 00:00:00 EDT 1992

OSTI ID:7259186

Bard, S; Wu, J J; Trimble, C A

This patent describes an improved Joule-Thomson cryogenic refrigeration system having a cold head and a cryostat assembly connected to a source of compressed gas. It comprises an adjustable expansion valve means; a temperature sensing and adjusting means; and an absolute pressure valve means, connected to exhaust side of the valve expansion means, for maintaining a constant exhaust pressure of the system independent of changes in ambient atmospheric pressure.

• Assignee: National Aeronautics and Space Administration, Washington, DC (United States)
• Patent Number(s): US 5119637; A
• Application Number: PPN: US 7-636076
• OSTI ID: 7259186
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
661210* -- Cryogenics-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPRESSED GASES
CONTROL EQUIPMENT
COOLING
CRYOGENICS
CRYOSTATS
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDS
GAS FLOW
GASES
JOULE-THOMSON EFFECT
REFRIGERATION
TECHNOLOGY ASSESSMENT
TEMPERATURE RANGE
TEMPERATURE RANGE OVER 4000 K
THERMOSTATS