subject: Frbiz Reports Four-valve Pulse Tube Cooler New Study [print this page] New four-valve pulse tube cooler and the general four-valve pulse tube refrigerator, compared with two characteristics: First, "L" pulse tube structure to replace the usual "I" type vessel structures, which greatly simplifies the vascular cold-side structure, improve the structure of the symmetry of refrigerator and pulse tube cold head and the horizontal portion can be combined with cooling; Second, the hot end of pulse tube structure with double orifice valve to replace the usual single-orifice structure, used to control vessel were the quality of the hot end into the exhaust flow rate. Then introduced the helium compressor with a valve driven by the initial performance test, the test results were compared, and gives way to further improve performance.
Key words: four valve pulse tube refrigerator "L" double-orifice type pulse tube Test
A front pressure pulse tube cooler is the use of periodic changes in an air, in a low thermal conductivity of the tube back and forth oscillation, resulting in a larger temperature gradient of refrigerator. With other forms of small cryocoolers, such as the G-M, stirling-type cooler than the conventional back because there is no pulse tube refrigerator with low temperature heat moving parts, a fundamental solution to the prevailing conventional refrigerator cold chamber vibration, wear and other outstanding problems, is expected to achieve long operating life, which in space technology, superconducting applications, communications, electricity and other high-tech field has great potential.
Since 1963, Gifford and Langsiwosi presented and developed the basic pulse tube cooler [1] has, through a variety of pulse tube cooler variant, there orifice [2], double-inlet type [3] , 4 valve type [4], active gas storage type [5]. Four-valve pulse tube refrigerator which is Professor of Japanese Yoichi Matsubara made in 1993, compared to experimental results show that this scheme than the conventional orifice pulse tube refrigerator has a greater cooling capacity. [4] But for now, mainly through regulating vascular hot end of the mass flow rate and pressure wave phase approach to improve the refrigerator between the performance, the four-valve pulse tube refrigerator in this area has more advantages, it has great the potential to be efficient pulse tube cooler. As the four-valve pulse tube refrigerator of the valve more, the key is for single-class research, Germany [6-7], Japan [4,8], China [9] researchers four valve pulse tube refrigeration Machines have carried out more research, research is basically around to improve performance, stability analysis carried out. Four-valve pulse tube refrigerator currently the best performance in the Sumitomo Heavy Industries of Rui and other machines were developed, the first vessel of cold minimum temperatures 21.6K, cooling capacity 33.5W @ 80K [8].
To further simplify this side of the structure of the cold refrigerator, a "L" pulse tube structure, and the hot end of the vessel were used to control the two orifice pulse tube hot end into the exhaust, and this structure performance were tested. 2 "L" pulse tube structure and two-orifice structure and the usual four-valve pulse tube refrigerator compared to four in this article valve pulse tube cooler has two characteristics: First, use "L"-type pulse management structure to replace the usual "I" type vessel structures, greatly simplifying the pulse tube cold end structure; second pulse tube hot end dual-orifice structure, replacing the usual single-orifice structure, used to control the clock, respectively control the quality of the hot end into the exhaust flow rate. This can be better adjusted.
