Vacuum pump with heated vapor pre-trap
US5067251A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1991 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Jan 8, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B25/006
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A heater equipped pre-trap chamber is provided at the upstream side of the inlet to a vacuum diaphragm pump so that gas products and solvent drawn from a specimen in a drying chamber can be subjected to a separation operation in the pre-trap chamber to remove liquid and readily condensable vapor forms of solvent. This thereby prevents entry of liquid solvent to the pump unit where it could cause damage. The inlet to the pump is located some distance above the outlet from the pre-trap chamber so that any liquid as may carryover in the flow from the pre-trap chambers towards the pump inlet, will return to the pre-trap as a gravity induced back flow. Solvent collected in the pre-trap chamber is heated to vaporize it and pass it out through the pump in that form to the outside atmosphere, making the pre-trap self-cleaning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.