PUMPING PLANT, PUMP AND METHOD OF PUMPING-OUT FLUID MEDIUM Russian patent published in 1997 - IPC

FIELD: pumping liquids out of deep wells. SUBSTANCE: flexible diaphragm separates cavities containing actuating liquid and liquid to be pumped out. Cavities are formed by one or several chambers mounted inside casing of pump between end walls. Cavities for liquid to be pumped out are in free communication with cavity of casing and with source of liquid to be pumped out through suction valve and with discharge passage through delivery valve. Actuating medium (liquid) cavities are brought in communication with its source by means of respective branch pipes located in cavity of casing and actuating medium passage. Hydraulic motor is located on surface or directly above pump in tubing. Flexible diaphragms may take form of wall of chamber forming respective cavity at excessive pressure in other cavity of chamber relative to pressure in first cavity of chamber not exceeding 10 percent of maximum working pressure differential. Cavities for medium to be pumped out are brought in turn in communication with source of this medium and discharge passage. To this end, pressure is cyclically changed in cavities for actuating medium at delivery and discharge. Position and shape of flexible diaphragms in chambers changes cyclically. In each cycle, volume of actuating medium fed to respective cavities is maintained below the difference between maximum and minimum volumes of cavities for medium to be pumped out at extreme positions of diaphragms. EFFECT: enhanced reliability. 20 cl, 4 dwg