Pump with a direct thrust recovery device for driving fluids

Abstract

The invention relates to a pump with a direct thrust recovery device for driving fluids, formed by pumping mechanisms formed by pistons ( 4 ) which are actuated in reciprocating longitudinal movement, the corresponding piston ( 4 ) playing in each pumping mechanism between two chambers ( 6 and 7 ), through one of which the passage of the fluid to be pumped is established, whereas in the other chamber the reject flow of the applied system enters and exits, such that said reject flow acts to directly thrust the piston ( 4 ), exerting a complementary action of the drive thereof.

1 . A pump with a direct thrust recovery device for driving fluids, of the type comprising one or more pumping mechanisms formed by respective pistons which are actuated in reciprocating longitudinal movement to drive a feed fluid into a system in which a reject flow provided with an energy which can be harnessed is produced, characterized in that each pumping mechanism includes in one and the same structural and functional unit the pumping system and the reject flow energy recovery system by means of a piston ( 4 ) playing between two chambers ( 6  and  7 ), through one of which chambers the passage of the fluid to be pumped is established, whereas in the other chamber the reject flow the energy of which can be harnessed enters and exits, exerting a direct thrust on the piston ( 4 ), acting as a complement of the drive thereof in the pumping action. 
   
   
       2 . The pump with a direct thrust recovery device for driving fluids according to  claim 1 , characterised in that the chambers ( 6  and  7 ) between which the piston ( 4 ) plays have respective inlets ( 8  and  10 ) and respective outlets ( 9  and  11 ) in which corresponding opening and closing rotary valves ( 8 . 1 ,  9 . 1 ,  10 . 1  and  11 . 1 ) act, said valves being actuated synchronously by a common transmission, to determine alternating intake and expulsion phases in the pumping chamber and alternating reject flow energy inlet and outlet phases in the energy harnessing chamber, in combination with the displacements of the piston ( 4 ). 
   
   
       3 . The pump with a direct thrust recovery device for driving fluids according to  claim 1 , characterised in that the piston ( 4 ) is arranged with a sealing system ( 13 ) between the chambers ( 6  and  7 ) and with a sealing system ( 14 ) for sealing the outlet towards the exterior in the rear part, the sealing system ( 14 ) being incorporated on a rear extension with a smaller diameter than the body of the piston playing between the chambers ( 6  and  7 ). 
   
   
       4 . The pump with a direct thrust recovery device for driving fluids according to  claim 3 , characterised in that the sealing systems ( 13  and  14 ) of the piston ( 4 ) are determined with ceramic rings ( 15 ), a controlled partial sealing being established with leaks aiding in the sliding and acting as a coolant. 
   
   
       5 . The pump with a direct thrust recovery device for driving fluids according to  claim 3 , characterised in that the sealing systems ( 13  and  14 ) of the piston ( 4 ) are determined with a controlled partial sealing ceramic ring ( 15 ) and an additional closure complement made up of a double assembly of sealing gaskets ( 16 ) with an intermediate chamber ( 17 ) which is pressurised by means of the external supply of a lubricating fluid.