Refrigeration – Automatic control – Refrigeration producer
Patent
1995-07-07
1997-01-21
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62 512, 236 92B, F25B 4100
Patent
active
055950655
ABSTRACT:
An integral combination of expansion valve and evaporator in a cryostat using a single support member. The valve includes two flow orifices, one orifice being used primarily for steady-state operation and the other orifice being used only during cool-down. An actuator having a high coefficient of thermal expansion moves a needle positioned in the cool-down orifice such that a large orifice flow area at the start of cool-down is automatically and continuously reduced as the actuator temperature decreases as refrigerant is throttled through the orifice. Within a range of approximately 30 K from the desired steady-state evaporator temperature, the needle completely blocks the cool-down orifice. Then, refrigerant flows through the steady-state orifice which has a remotely adjustable needle. In the final stage of cool-down, the refrigerant system is entirely controlled by the steady-state orifice and its associated needle. In other embodiments, the steady-state orifice and adjusting needle, are replaced with a fixed restrictor, such as a capillary tube, that is positioned in parallel with the cool-down orifice and needle. The fixed restrictor is sized to satisfy the desired steady-state operating conditions.
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Boiarski Michael
Hill Dennis H.
Khatri Ajay N.
Klusmier Lawrence A.
Longsworth Ralph C.
APD Cryogenics
Tanner Harry B.
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