Liquid filtration system
US4071451A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1977 |
| Grant date | Jan 31, 1978 |
| Priority date | — |
| Expiry date | Jan 31, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/92
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filtration system for removing both large, bulky and small, compactible solid contaminants from a liquid, intended primarily for the collection of chips and purifying and recycling coolant liquids used in machining and other metal working operations. Contaminanted liquid which has been used in the machining operation transports metal chips and other contaminants to a tank divided into upper and lower compartments by a wedgewire strainer. The sub-atmospheric pressure which develops in the lower compartment due to pumping of clean liquid from the lower compartment and the build-up of small, compactible contaminants on the upper side of the strainer is measured and a signal commensurate with the magnitude of the pressure provides the input to a drive motor for a continuous loop drag conveyor which scrapes the chips and sludge from the surface of the strainer. Thus, the rate of chip and sludge removal and the degree of coolant clarity is continuously and directly proportional to the degree of contaminant build-up. Also, the input signal to the drive motor has a minimum value greater than zero which is established as a function of the volumetric rate at which large, bulky contaminants…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.