Supercharger with outlet bars for rotor tip seal support
US7845921B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2008 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Jun 30, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C27/001
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention is to reduce flutter and wear and improve the serviceability and wear life of tip seals for roots blower and screw type compressor superchargers where used for improved supercharger output and efficiency. As the seals travel over the outlet opening, the seals move outward in their slots, leading to flutter which may shorten their useful lives. As each seal reaches the center of the outlet opening, it is forced back into its groove by engaging a valley of the mating rotor with the likelihood of increased wear. The invention provides longitudinally spaced support bars extending laterally across the opening in the directions of rotation of the rotors. The support bars have inner surfaces machined with the associated rotor cavity bores and thus smoothly support the seals as they ride over the support surfaces. The support reduces the flexing of the seals and the resultant wear. Each seal contacts a support bar only during inward motion to the center of the opening where the machined bores intersect and the seal is moving into a valley of the associated rotor of the pair. To reduce edge effect wear of the seals, the width of the support bars may be made narrower from the o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.