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:
Aug. 20, 2002
Filed:
Apr. 02, 2001
Shaowei Zhu, Kariya, JP;
Masahumi Nogawa, Toyota, JP;
Shin Kawano, Kariya, JP;
Tatsuo Inoue, Anjo, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
In a pulse tube refrigerator the refrigeration efficiency has been improved by reducing the on-off valve loss. A second space in a cylinder member is connected with a second high pressure on-off valve and a second low pressure on-off valve . A buffer side on-off valve is provided between the buffer space (a buffer tank ) and the second space . By opening the buffer side on-off valve before the second high pressure on-off valve or the second low pressure on-off valve is open, the pressure in the second space can be the intermediate pressure. Since the pressure difference when the valves are open is decreased, the on-off valve loss can be decreased.