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. 30, 2022
Filed:
Sep. 25, 2019
Daikin Industries, Ltd., Osaka, JP;
Daisuke Okamoto, Osaka, JP;
Mikio Kajiwara, Osaka, JP;
Yohei Nishide, Osaka, JP;
Naoto Tomioka, Osaka, JP;
Masaaki Adachi, Osaka, JP;
Yousuke Ohnishi, Osaka, JP;
Akitoshi Ueno, Osaka, JP;
Takuya Horita, Osaka, JP;
Masaaki Takegami, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, an oil return pipe that returns the oil discharged by the high-stage compressor to the low-stage compressor, and an oil discharge pipe that discharges the oil in the low-stage compressor. The low-stage compressor includes a compression part that compresses the refrigerant, a motor that drives the compression part, and a container that houses the compression part and the motor. The container forms a high-pressure space storing compressed refrigerant. Inside of the oil return pipe and inside of the oil discharge pipe are connected to the high-pressure space.