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Temperature Stabilization Device

IP.com Disclosure Number: IPCOM000096601D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Jones, RE: AUTHOR [+2]

Abstract

This system temporarily maintains the liquid helium vapor pressure and, therefore, temperature, in a cryostat well 1 constant upon failure in a closed-cycle helium refrigerator system.

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Temperature Stabilization Device

This system temporarily maintains the liquid helium vapor pressure and, therefore, temperature, in a cryostat well 1 constant upon failure in a closed-cycle helium refrigerator system.

Normally-open valves 3 and 5 and normally-closed valves 7 and 9 can be solenoid valves actuated by safety switches, not shown, in the refrigerator system. Cryostat well 1 is connected along a line including valve 3 to chamber 1l of bellows structure 13. Thus, chamber 11 is normally filled with helium gas at the operating helium vapor pressure in well 1. The interior of bellows housing 15 is connected to reservoir 17 along a first line 19 and, also along a second line which includes variable opening 21, normally-operating pump 23, valve 5, and needle valve 25. Needle valve 25 permits a small, but steady, flow of helium gas. Bellows structure 13 is adjusted so that variable opening 21 is closed when the helium vapor pressure in reservoir 17 and cryostat well 1 are equal.

When a failure occurs in the refrigerator system, valves 3 and 5 close and valves 7 and 9 open concurrently. Reservoir 17 is effective to damp out pressure transients in the system at this time. Closure of valve 3 maintains the helium gas in bellows chamber 11 constant. Cryostat well 1 is now evacuated by pump 23 along the line including valve 7, reservoir 17, line 19, bellows housing 15, through variable opening 21 and valve 9 to the atmosphere. The rate of pumping of the helium vapo...