| With the development of science and technology, more and more extensive requirements are proposed by space industry, military, information technique, biomedical and other industries. High frequency pulse tube cryocooler possessing compact size, light weight, high efficiency, long life and other merits has become one of the hottest areas in cryogenics field. The high temperature superconducting devices, IR sensors, liquid hydrogen storage and other applications require two stage or multi-stage high frequency pulse tube cryocooleres to achieve a lower cooling temperature.After a detailed review on the historical developments of the research on high frequency pulse tube cryocooler, as well as the latest advancies in the field, present work focuses on the following tips:1. Flexure spring supporting technology. Based on finite element analysis, the influence of geometric parameters of a flexure spring on its performance has been generalized. On that basis, a set of optimized flexure springs were designed and fabricated for the linear compressor. Experimental research on the performance of flexure spring was also carried out, and validated the FEA analysis results.2. Optimum design of a high frequency two stage pulse tube cryocooler. Discussed the couple method of a two-stage pulse tube refrigerator, optimized the dimensions of regenerator and pulse tube, the structure of the heat exchanger, and phase shifter for both stages. The dimensions and structure of the linear motor as well as the linear compressor were also optimized through FEA method.3. RC load driven by a linear compressor. The influence of spring stiffness, charge pressure, load resistance, input power etc. on the performance of the linear compressor was studied experimentally.4. Two stage pulse tube cryocooler driven by a linear compressor. The influence of charge pressure, operation frequency, control of phase shifter and input power on the performance of a pulse tube cryocooler was studied experimentally. |
PDF Full Text Request