Pump with separate pumping stages for pumping a plurality of liquids
US5785504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Jun 27, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/106
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The pump comprises three distinct series of pumping stages driven on a single shaft by the same motor. Between the first and second series of pumping stages, the liquid is diverted from the pump through a by-pass towards, for example, a filtering device for removing the liquid as many impurities as possible. Then, the filtered liquid is conveyed back to the second series of pumping stages of the pump where the liquid is pumped at high pressure before being conveyed through a by-pass outside of the pump and towards a treatment chamber, such as a chamber for reverse osmosis, nanofiltration, or the like. The permeate (filtered solution) is removed from the installation whereas the solute (concentrated solution) is, in large part, reconveyed towards a third series of pumping stages, at the discharge of which the liquid is mixed with the filtered liquid from the second series of stages and the mixture is then conveyed again towards the treatment chamber. This high yield system eliminates a second and third pump. The pump can also be used for pumping independently, that is without mixing, more than one liquid. In this case, the pumping stages are once again separated from one another, wi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.