The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 2002
Filed:
Nov. 30, 2001
Applicant:
Inventors:
Shin Kawano, Kariya, JP;
Masahumi Nogawa, Toyota, JP;
Shinji Katsuragawa, Chiryu, JP;
Tatsuo Inoue, Anjo, JP;
Assignee:
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Primary Examiner:
Int. Cl.
CPC ...
F25B 9/00 ;
U.S. Cl.
CPC ...
F25B 9/00 ;
Abstract
A rotary valve unit in a pulse tube refrigerator is quiet, and has high durability and improved refrigeration efficiency by restricting the generation of unidirectional flow. A center hole is formed on a sliding plane side as a recessed space in the sliding surfaces between the sliding plane and another sliding plane. Since the second center hole is in communication with a low pressure input port via a communication passage, the leakage between the sliding surfaces of the sliding planes can be introduced to the low pressure input port with low pressure.