Pulsation free pump
US5993174A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1996 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Nov 18, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention provides a pulsation free pump which includes a plurality of hydraulic diaphragm pumps, a plurality of plungers corresponding to the hydraulic diaphragm pumps, each of the plungers performing a reciprocal movement which provides a pumping cycle operation of corresponding one of the plurality of hydraulic diaphragm pumps and an adjustable exhaust differential pressure regulating valve. Each of the pumping cycles includes a discharge process and a subsequent suction process. A controller is provided for controlling reciprocal movements of the plungers in association with each other at a predetermined difference in phase of the pumping cycle. The controller controls the reciprocal movement of each of the plungers so as to set a preliminary pressure-rising process just before the discharge process so that a discharge flow rate of each of the diaphragm pumps is initiated to increase without any time delay when the pumping cycle enters into the discharge process so that a total discharge flow rate defined by the sum of the discharge flow rates of all of the plungers is kept constant and free of any substantial pulsation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.