Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Reexamination Certificate
1999-11-30
2001-10-30
Doerrler, William (Department: 3744)
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
Reexamination Certificate
active
06308520
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention is directed to a multi-type pulse-tube refrigerating system.
2. Discussion of the Background:
A conventional refrigerating system having a plurality of cryogenic temperature generating devices is known as disclosed in Japanese Patent Laid-open No. Hei.5(1993)-45014 published in 1993 without examination.
In the foregoing conventional refrigerating system, each of the cryogenic temperature generating devices is a Gifford-MacMahon type one which is provided with a displacer or piston as an essential element in the vicinity of a cold head. Thus, for generating cryogenic temperature at the cold head of each of the devices, each of the pistons is brought into movement, thereby generating vibrations around the refrigerating system.
Such a conventional refrigerating system may not be acceptable to cool specific substances or items such as a scintillation counter of an energy dispersion type X-ray analyzer. The reason is that the scintillation counter has to be free from vibrations or shocks. Accordingly, a need exists for a refrigerating system without the foregoing drawback.
SUMMARY OF THE INVENTION
It is an object of the present invention to satisfy the need noted above. According to an object of the invention, the above and other objects are achieved by a multi-type pulse tube refrigerating system which comprises a common compressor including a sucking port and a discharging port; a plurality of parallel pressure changeover valve units connecting between the sucking port and the discharging port of the common compressor; and a plurality of pulse-tube based cryogenic temperature generating devices connected to the respective pressure changeover valve units.
REFERENCES:
patent: 5412952 (1995-05-01), Ohtani et al.
patent: 5845498 (1998-12-01), Matsui et al.
patent: 5927081 (1999-07-01), Li
patent: 5974807 (1999-11-01), Gao et al.
patent: 5-45014 (1993-02-01), None
Aoyama Kimio
Inoue Tatsuo
Kawano Shin
Nogawa Masafumi
Aisin Seiki Kabushiki Kaisha
Doerrler William
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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