Scroll-type, positive fluid displacement apparatus with diverse clearances between scroll elements
US4382754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1980 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Nov 20, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C18/0269
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention comprises a positive fluid displacement apparatus of the scroll-type described as a fluid compressor in the exemplary embodiment. The embodiment has single fixed and movable scroll elements in which the latter describes orbital movement relative to the former to form variable volume pockets therebetween which move from an inlet to an outlet. To accommodate for a difference in thermal expansion between the innermost and outermost zones of the apparatus, the scroll elements are formed with varying thicknesses along the lengths thereof. Accordingly, centrally of the apparatus, whereat an exhaust port is formed, scroll element thicknesses are greatest, the compressed fluid is most dense, and the thermal expansion is least, the elements define close, substantially sealing minimum clearances of a given measure. In the outermost confines of the apparatus, whereat an inlet port is formed, scroll element thicknesses are least, the fluid is less dense, and the thermal expansion is greatest, the elements define similar minimum clearances, albeit of greater than the aforesaid given measure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.