| 摘要 |
<p>PURPOSE:To add constantly the predetermined pressure to freezing mixture so that the fixed quantity of liquid freezing mixture may be spouted, pressurizing liquid freezing mixture enclosed in a container by gas having a liquefying temperature lower than that of liquid freezing mixture and spouting it from the container. CONSTITUTION:A fixed pressure is applied to a container A after 8 liquid extracting valve 2 and a booster valve 7 are closed, a gas discharge valve 6 is opened and the pressure from a helium bomb 22 is adjusted with a reducing valve 13. In case, the predetermined pressure is obtained, liquid nitrogen in the container A is spouted by opening the liquid extracting valve 2. The above process may bring some charge of liquid level within the container A, however, it is possible to extract liquid nitrogen within the container A at a fixed flow rate because the fixed pressure is always applied to the liquid level by helium gas. Furthermore, since the liquefying temperature of helium gas is lower than the changing temperature of inner liquid nitrogen and gas touching the liquid nitrogen does not liquefy, good stability is obtainable.</p> |
