Abrégé

A hydraulically driven diaphragm pumping machine ("pump"), in particular for water and difficult-to-pump materials, comprises at least two side-by-side pumping units. Each pumping unit comprises a hydraulically-driven pump cylinder (1,2) and a separate non-pump hydraulic drive cylinder (9,10). The pump cylinder (1,2) has a lower first end with a first inlet and outlet for fluid to be pumped and an upper second end with a second inlet and outlet for hydraulic fluid. The pump cylinder (1,2) contains a bellows (3,4) closed at its lower end and open at its upper end for communication with hydraulic fluid. The outside of the bellows (3,4) defines a space for fluid to be pumped. The bellows (3,4) of the pump cylinder (1,2) is arranged to be driven by hydraulic fluid supplied at its top end, in concertina like expansion and contraction to pump the fluid to be pumped adjacent the lower first end of the pump cylinder (1,2). The hydraulic drive cylinder (9,10) is placed side-by-side the pump cylinder (1,2). The hydraulic drive cylinder (9,10) has a lower first end associated with a hydraulic drive and an upper second end containing hydraulic fluid communicating with the upper second end of the pump cylinder (1,2). The hydraulic drive terminates at its upper end with a drive piston (19,20) slidably mounted in the hydraulic drive cylinder (9,10). The hydraulic drives of the hydraulic drive cylinders (9,10) of the two pumping units are connected by a hydro-mechanical connection (25,27) designed to control drive of the hydraulic fluid to advance and retract the pistons (19,20) of each hydraulic drive cylinder (9,10).

Classes IPC  ?

• F04B 9/105 - "Machines" ou pompes à piston caractérisées par les moyens entraînants ou entraînés liés à leurs organes de travail les moyens étant à fluide le fluide étant liquide avec une seule chambre de pompage le mouvement alternatif de l'organe de pompage étant obtenu par un moteur hydraulique à double effet
• F04B 43/113 - Pompes ayant un entraînement par fluide le fluide d'entraînement étant commandé par au moins un clapet

Abrégé

A hydraulically driven diaphragm pumping machine comprises a plunger (6) that is slidably mounted in a middle part of the inside of the machine's hydraulic cylinder (5) between first and second bellow-like diaphragms (4,10). Ends of the plunger (6) are connected to the first and second bellows-like diaphragm (10) to define respective first and second outer annular spaces (a) that are independent of one another, and the pressure of fluid in the first annular space (a) is independent of the pressure of fluid in the second annular space (a). The machine may also comprise a hydromechanical switch for commutating a valve (102) to automatically control the supply of hydraulic fluid to the hydraulic cylinder at given moments of the machine's cycle.

Classes IPC  ?

• F04B 43/113 - Pompes ayant un entraînement par fluide le fluide d'entraînement étant commandé par au moins un clapet
• F04B 9/105 - "Machines" ou pompes à piston caractérisées par les moyens entraînants ou entraînés liés à leurs organes de travail les moyens étant à fluide le fluide étant liquide avec une seule chambre de pompage le mouvement alternatif de l'organe de pompage étant obtenu par un moteur hydraulique à double effet

Abrégé

A hydraulically driven multicylinder diaphragm pumping machine for pumping difficult-to-pump materials comprises pump cylinders each having at one end (20) an inlet/outlet (21) for fluid material to be pumped supplied under adjustable pneumatic pressure, and at the other end (30) an inlet and outlet (31,32) for hydraulic oil. A separator (40) movable to-and-fro inside the pump cylinder (10) is connected to the fluid-material end of the cylinder by a bellows-like flexible diaphragm (45) and to the fluid material end (30) by another bellows-like diaphragm (46) leaving an outer annular space (49) that contains hydraulic fluid. The total volume of pumping hydraulic oil in the cylinders (10.1-10.12) is maintained constant and equal to 1/2 the total displacement volume of the cylinders by a device (65) that compensates for thermal expansion and controls the necessary return flow of hydraulic oil for driving the pump. The separators (40) move with an intake stroke at constant speed for all cylinders, and with pumping strokes function of the hydraulic oil delivery, so a lesser number of separators (40) effect an intake stroke while a greater number of separators (40) effect a discharge stroke.

Classes IPC  ?

• F04B 43/113 - Pompes ayant un entraînement par fluide le fluide d'entraînement étant commandé par au moins un clapet