초록 ▼

A pulse tube refrigerator which can generate cryogenic temperatures of below 10 K includes first and second refrigeration stages. Each stage includes a pulse tube and an associated regenerator provided at the low temperature side of the pulse tube. A pressure fluctuation generator having a compresso

A pulse tube refrigerator which can generate cryogenic temperatures of below 10 K includes first and second refrigeration stages. Each stage includes a pulse tube and an associated regenerator provided at the low temperature side of the pulse tube. A pressure fluctuation generator having a compressor and a first to a fourth valve is provided at the high temperature side of each regenerator. The high temperature sides of each pulse tube are connected by a continuous channel while the high temperature side of each pulse tube and the high temperature side of each regenerator are connected by a by-pass channel. A magnetic material having a rare-earth element and a transition metal is used as a regenerative material for the regenerator. When pressure fluctuation is generated in each pulse tube at the phase difference angle of 180.degree., respectively, a working gas is transferred between the high temperature sides of each pulse tube, therefore, the phase angle between the pressure fluctuation in each pulse tube and the displacement of the working gas is optimized. Further, the flow amount of the operating gas sent to each regenerator is limited using a by-pass channel.

대표청구항 ▼

[ What is claimed is:] [1.] A pulse tube refrigerator, comprising:a first pulse tube refrigerating means and a second pulse tube refrigerating means each having a respective pulse tube and a respective regenerator provided at a low temperature side of the associated pulse tube;a pressure fluctuation

[ What is claimed is:] [1.] A pulse tube refrigerator, comprising:a first pulse tube refrigerating means and a second pulse tube refrigerating means each having a respective pulse tube and a respective regenerator provided at a low temperature side of the associated pulse tube;a pressure fluctuation generating means to generate a pressure fluctuation of a working gas provided at a high temperature side of each regenerator of the first and second pulse tube refrigerating means;a continuous channel connecting the high temperature sides of each pulse tube of said first and second pulse tube refrigerating means to each other;a by-pass channel connecting the high temperature side of the pulse tube in said first pulse tube refrigerating means and the high temperature side of the regenerator and at the same time, connecting the high temperature side of the pulse tube in said second pulse tube refrigerating means and the high temperature side of the regenerator; andat least one regenerator among said regenerators containing a rare-earth element magnetic material composition and a transition metal as a regenerative material.