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:
Nov. 19, 2002
Filed:
Feb. 15, 2000
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
In a gas compressor-expander according to the invention, a partition wall between a space in the rear of a piston and a crank chamber has a piston rod slidably extending therethrough and a seal device surrounding the piston rod . The seal device comprises a first seal member having a high sealing property against a flow from the crank chamber toward the space , an intermediate chamber provided in the vicinity of the first seal member at one side thereof toward the space, a second seal member disposed in the vicinity of the intermediate chamber at one side thereof toward the space, and a communication channel for holding the intermediate chamber and the crank chamber in communication with each other. This construction gives a prolonged life to the seal device and prevents impairment of the refrigeration capacity of the gas compressor-expander.