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:
Sep. 09, 2025
Filed:
Feb. 18, 2021
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Kimihiko Mitsuda, Tokyo, JP;
Shuhei Sasaki, Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A crude oil extraction pump includes: a production pipe having a tubular shape along an axis extending in a vertical direction; a pump rotor extending in a direction of the axis inside the production pipe; and a pump stator surrounding the pump rotor, wherein the pump rotor includes a pump shaft and an impeller which is provided in multiple stages and rotates together with the pump shaft to pump crude oil upward, and wherein the pump stator includes a stator body having a tubular shape, a plurality of vanes protruding radially inward from an inner peripheral surface of the stator body and are provided above the respective impellers, a diffuser hub which is formed on a radial inside of the vane, a bearing device which is installed on an inner peripheral side of the diffuser hub, and a hub extension portion which is formed at an upper end portion of the diffuser hub and having an outer peripheral surface having a constant outer diameter centered on the axis.