Backup ring and liquid feeding pump using backup ring
US11905946B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2018 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Sep 8, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B9/042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A backup ring is for contacting with and supporting a plunger seal which is for sealing a pump chamber provided in a pump head of a plunger type liquid feeding pump. The backup ring includes a maximum outer diameter portion of a cylindrical shape and a smaller outer diameter portion. The maximum outer diameter portion includes a maximum outer diameter in a plunger seal supporting surface side that makes contact with a rear surface of the plunger seal. The smaller outer diameter portion includes a smaller outer diameter than the maximum outer diameter portion in at least one part of a portion other than the maximum outer diameter portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.