Sealing device with convertible magnetic sealing medium
US10989308B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2020 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Oct 20, 2040 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/765
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sealing device with convertible magnetic sealing medium includes a housing with an accommodation cavity formed therein, a rotary shaft rotatably disposed in the accommodation cavity, a first pole piece disposed on the rotary shaft, a second pole piece fitted over the rotary shaft, and a permanent magnet fitted over the rotary shaft between the first pole piece and the second pole piece. The rotary shaft has a first blind hole, a second blind hole, a first via hole and a second via hole. A plurality of first pole teeth are provided in an inner circumferential wall of the first pole piece and a plurality of second pole teeth are provided in an inner circumferential wall of the second pole piece. Magnetic powder is provided between a top surface of each of the first and second pole tooth and the outer circumferential surface of the rotary shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.