Low heat loss liquid helium disconnect attachment and system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorVernon L. Potter
Life of this patent
Estimating the term…
Abstract
An easily maintainable interface for magnet dewars which includes a low h leakage disconnect fitting that retains the vacuum integrity of both the dewar and the transfer line is provided. The fitting includes a bayonet-type insert having separate coils disposed about a central conduit for cooling or heating the unit depending upon intended use. Liquid helium is introduced axially through the bayonet which is adjustable to a purge position wherein either gaseous or liquid helium may be introduced to clean, heat or cool the unit, or a flow position wherein liquid helium is passed through the bayonet into the supply line.
Claims20
A low heat leakage disconnect fitting adapted to interface with magnet dewars and which retains the vacuum integrity of both the dewar and a transfer line connected thereto comprising:
- a bayonet-type insert for said dewars having an axial flow passage;
- an enclosed inner annular chamber in said insert formed about said axial passage for insulating the passage;
- an enclosed outer annular chamber in said insert and means in said outer chamber for conducting gases in both gaseous and liquid form adjacent to the periphery of said inner annular chamber to control the temperature of said dewar and said insert;
- means in said insert for selectively diverting the fluid in said axial passage to the periphery of said insert;
- and
- means common to said dewar and said insert for admitting and exiting said gases,
- said means for diverting fluid including means for selectively preventing axial flow of fluid from entering said outer chamber,
- whereby said insert when in the purge position directs fluid from said axial passage into said means for conducting gases and to the periphery of said insert to selectively alter the temperatures thereof, and when in the through-flow position prevents lateral dispersion of gases from said axial passage.
A system for purging and/or warming or cooling a magnet dewar or other similar vessels comprising:
- a multi-tubular interface adapted for insertion into and connection to said dewar and having a plurality of concentric passages and means sealing the contacting surfaces of said interface and said dewar at each end thereof;
- said sealing means including a peripherally sealing nozzle secured to the end of said interface first inserted into said dewar,
- the inner of said passages adapted to connect supply and outlet transfer lines,
- the next outer of said passages insulating said inner passage;
- individual purge and vapor-cooled lines deployed in the outer of said passages for effecting purging of said inner passage and temperature change of said dewar;
- and
- a transfer assembly in said dewar and means for seating said nozzle adjacent said transfer assembly so as to allow successively for through flow of fluid and for peripheral diversion of fluid to effect said purging and temperature change.
A low heat loss liquid helium disconnect system which affords coupling and transfer line cool down before hookup to a coil dewar without contaminating either the coil dewar, the transfer line or the supply dewar comprising:
- a multi-chambered bayonet interface adapted for insertion into said coil dewar;
- means adjustably connecting said interface to said dewar in purge and through-flow positions at substantially the entrance to said dewar;
- and
- means in said dewar for receiving the forward end of said interface in said adjustable purge and through-flow positions,
- said interface having an axial chamber directly coupled to said dewar in the through-flow position and an outer chamber having purge and vapor-cooled helium conducting lines extending substantially therethrough for effecting purging and temperature control,
- said lines having a common manifold a substantial distance from the forward end of said interface,
- the periphery of said interface and said dewar forming an annular passage for exiting helium,
- whereby said interface when in the through-flow position directs supply helium only to said dewar and purge helium through said lines and said annular passage, and in the purge position directs supply helium and purge helium through said lines and said annular passage.
Dependencies are inferred from the claim text.