| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cryogenic refrigerator capable of enhancing the efficiency of refrigeration more effectively. <P>SOLUTION: The cryogenic refrigerator 1 includes a first stage displacer 2; a first stage cylinder 4 configured to form a first expansion space 3 between the first stage displacer 2 and the first stage cylinder; a second stage displacer 5 connected to the first stage displacer 2; a second stage cylinder 7 configured to form a second expansion space 6 between the second stage displacer 5 and the second stage cylinder; and a helical groove 8 formed on the outer peripheral surface of the second stage displacer 5 so as to helically extend from the second expansion space 6, wherein the second stage cylinder 7 includes a first flow resistor 9 communicating with the first stage displacer 2 side in the helical groove 8 and a buffer portion 10 communicating with the first stage displacer 2 side in the first flow resistor 9. <P>COPYRIGHT: (C)2013,JPO&INPIT |
