Abstract

A high pressure double membrane pump has a central housing (3), two cylindrical pump chambers (7,8), a coupling rod (4) which moves back and forth when the pump is in operation and which has a pump piston (9), two membranes which divide each of the pump chambers (7,8) into a product chamber (11,12) and a compressed air chamber (1,2) with changing volumes of which the membranes have a peripherally mounted membrane body (15). In the central area of the membrane body (15) a rigid implant body (17) is embedded which is equipped with a dog (18) which is connected to one end of the coupling rod (4), and a pneumatic control unit for the alternating impinging of compressed air upon the compressed air chambers. In the area of the compressed air chambers (1,2) a rigid supporting ring (20) is pushed onto the dog (18) between the end of the coupling rod (4) and the inner side of the membrane (5). The diameter of said supporting ring is between 50% and 95% of the diameter of the working surface of the membrane (5), and the periphery thereof is formed as a rounded shoulder (21) facing away from the membrane body (15).

IPC Classes  ?

• F04B 9/133 - Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor
• F04B 43/00 - Machines, pumps, or pumping installations having flexible working members
• F04B 43/073 - Pumps having fluid drive the actuating fluid being controlled by at least one valve