Pulse tube refrigerating system

摘要

A pulse tube refrigerating system has a refrigeration generation unit including a cold head with two ends. A pulse tube has its low temperature end connected to one end of the cold head and a regenerator has its low temperature end connected to the other end of the cold head. A pressure vibration source is connected to a high temperature end of the regenerator and serves to vibrate a working gas in the refrigeration generation unit by expanding and compressing the working gas. A flow control device is connected to a high temperature end of the pulse tube and establishes a phase difference between vibration and displacement of the working gas. The flow control device includes a buffer tank, a conduit interposed between the buffer tank and the high temperature end of the pulse tube, a restrictive member placed at one of the high temperature end and the low temperature end of the pulse tube, and a flow adjusting member interposed between the restrictive member and the pulse tube. The restrictive member is configured to restrict the working gas before the working gas enters the pulse tube and the flow adjusting member has a plurality of axial passages therethrough. One advantage of this pulse tube refrigerating system is that its coaxial arrangement makes the system easy to assemble.