Adjustable expandable cryogenic piston and ring

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863674

Mazur, Peter O ^[1]; Pallaver, Carl B ^[2]

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1. Aurora, IL
2. Woodridge, IL

The operation of a reciprocating expansion engine for cryogenic refrigeration is improved by changing the pistons and rings so that the piston can be operated from outside the engine to vary the groove in which the piston ring is located. This causes the ring, which is of a flexible material, to be squeezed so that its contact with the wall is subject to external control. This control may be made manually or it may be made automatically in response to instruments that sense the amount of blow-by of the cryogenic fluid and adjust for an optimum blow-by.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• DOE Contract Number: EY-76-C-02-3000
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4226169
• OSTI ID: 863674
• Country of Publication: United States
• Language: English

Related Subjects

adjustable
expandable
cryogenic
piston
operation
reciprocating
expansion
engine
refrigeration
improved
changing
pistons
rings
operated
outside
vary
groove
located
causes
flexible
material
squeezed
contact
wall
subject
external
control
manually
automatically
response
instruments
sense
amount
blow-by
fluid
adjust
optimum
cryogenic fluid
external control
expansion engine
flexible material
cryogenic refrigeration
/92/