Aspirating system
US3938705A · kind A · utility
Inventor
Key dates
| Filing date | Oct 23, 1969 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Oct 23, 1989 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0126
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for delivering venturi aspirated dry powder at a predetermined rate in which one end of an exhaust tube is embedded in a vessel of dry powder and a pressure gas inlet tube has a return bend portion smaller than and extending into the embedded exhaust tube end. A miniature flow regulator is employed to normally deliver controlled pressure gas to the aspirator inlet, wherein delivered gas pressure increases as the gas pressure supply decreases. The regulator has a gas source passage containing a normally slightly opened valve whose stem is held in such slightly open valve position by an adjustably biased piston which allows the valve to close when a predetermined amount of pressure gas has built up on the regulator outlet side of the valve. There is provision for incorporation of a piston pulser intermediate the regulator and the aspirator, wherein an accumulator develops predetermined gas pressures to reciprocate a spring loaded piston valve between open and closed positions, permitting delivery of pressure gas surges to the aspirator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.