Optimized fiber loading of rubber useful in PDM stators
US10215176B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2016 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Feb 19, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2253/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A stator for use in a positive displacement motor. The stator comprises a rubber compound including fiber reinforcement. The fiber reinforcement includes a plurality of elongated fibers. The elongated fibers in the fiber reinforcement create a grain direction generally with the grain in the longitudinal direction of the stator tube and across the grain in the transverse direction. The rubber compound has a 25% tensile Modulus that is at least 10% lower across the grain than with the grain. The fiber reinforcement includes a fiber loading of greater than about 2.5 phr of elongate fibers, the elongate fibers have a Modulus of greater than about 60 GPa, and the rubber compound has a 25% tensile Modulus of greater than about 400 psi against the grain and a 50% tensile Modulus of greater than about 700 psi against the grain. In some embodiments, the rubber reinforcement also comprises a blend of fibrillated fibers and short cut fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.