The closed cycle very low temperature refrigeration system which possesses the automatic variable flow area beam limiting device

摘要

(57) Abstract The expansion valve inside kuriosutatsuto which uses the single support component and one combination of the evaporator. The expansion valve includes 2 flow orifices, on the one hand orifice 62 is used by the operation of steady state mainly, 44 is used only when cooling on the other hand. When the actuator 28 whose coefficient of thermal expansion is high, moves the needle 46 inside cooling orifice 44, the refrigerant is squeezed with the orifice, the flow area where the orifice when starting cooling is large decreases, temperature of actuator 28 following, automatic, at the same time, it decreases continually. Inside the range of approximately 30K, the needle blocks cooling orifice 44 completely from evaporator temperature of steady state of desire. The refrigerant flows and, via the steady state orifice 62 which possesses remote adjustment possible needle 68. At last phase of cooling, as for the refrigeration system it is controlled to the whole steady state orifice 62, by the needle 68 which it is related to that.