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. 06, 2018
Filed:
Nov. 02, 2015
Coavis, Sejong-si, KR;
Gyu Sang Yu, Chungcheongbuk-do, KR;
Won Young Choi, Daejeon, KR;
In Seok Sohn, Chungcheongbuk-do, KR;
COAVIS, Sejong-si, KR;
Abstract
A multi-stage fuel pump includes a casing having a fuel intake formed on one side thereof and a fuel discharge port formed on the other side thereof, and a plurality of impellers provided within the casing, having a plurality of blades disposed on a circumferential surface in an outward direction of the circumferential surface and having blade chambers formed between the blades and penetrating through upper and lower surfaces of the impellers to allow fuel to be discharged and introduced to and from upper and lower sides of the blades, and formed in multiple stages, wherein fuel intaken through the fuel intake according to rotation of the impellers is discharged to the fuel discharge port through the blade chambers of the impellers, and the numbers of the blades of each of the impellers are different, thereby reducing blade passage frequency (BPF) noise generated according to rotation of the impellers.