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1改进结构设计的原因、目的及理论基础我厂以往设计制造的低温液体泵，结构设计已成型多年，广泛采用在空分成套设备上，具有一定的可行性和实用性。但还存在一些不足之处，归根结底就是净吸入压头（NPSH）过高，造成低温液体汽化量增大和在输送液体过程中发生脉动等。主要在以
1 to improve the structural design of the reasons, purpose and theoretical basis Our previous design and manufacture of cryogenic liquid pumps, structural design has been formed for many years, widely used in air separation plant, with a certain feasibility and practicality. But there are still some shortcomings, in the final analysis is the net suction head (NPSH) is too high, resulting in increased vaporization of cryogenic liquid and the transmission of liquid in the process of pulsation. Mainly in