Multistage dry vacuum pump
US8579601B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 21, 2011 |
| Grant date | Nov 12, 2013 |
| Priority date | — |
| Expiry date | Jan 18, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2240/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The multistage dry vacuum pump is disclosed, in which it is possible to prevent a pump from being adhesively stuck, which problem occurs due to a difference in thermal expansions between a cylinder body and a rotor, by making thermal expansion conditions between a cylinder body and a rotor of a pump similar by concurrently cooling the cylinder body and the rotor of the pump. The gas passage for transferring gas compressed by each cylinder is provided at each cylinder body in a shape of surrounding an outer side of each cylinder, and a cooling water jacket for circulating cooling water is provided close to an outer side of the gas passage, and a communication passage is formed at a gas passage contacting with the cooling water jacket and is connected with an exhaust space of the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.