Linear actuator for a high-pressure pump
A linear actuator for a high-pressure pump ( 1 ), the actuator comprising a rolling spindle with a shaft ( 10 ), a first nut ( 21 ) and a second nut ( 22 ), the nuts ( 21, 22 ) operatively connected to a first threaded section ( 11 ) and a second threaded section ( 12 ) of the shaft ( 10 ), respectively, the sections being configured with opposite threading directions, such that when rotating the nuts ( 21, 22 ) in opposite directions, the shaft ( 10 ) is axially movable with respect to the nuts ( 21, 22 ) in one same direction and an actuator for driving the movement of the shaft ( 10 ) simultaneously rotating the nuts ( 21, 22 ) in opposite directions.
1 . A linear actuator for a high-pressure pump ( 1 ), comprising a rolling screw with a shaft ( 10 ), a first nut ( 21 ) and a second nut ( 22 ), the nuts ( 21 , 22 ) being operatively connected to a first threaded section ( 11 ) and a second threaded section ( 12 ) of the shaft ( 10 ), respectively, configured with opposite threading directions, such that when rotating the nuts ( 21 , 22 ) in opposite directions, the shaft ( 10 ) can be axially displaced with respect to the nuts ( 21 , 22 ) in one and the same direction, and a drive for driving the displacement of the shaft ( 10 ), simultaneously rotating the nuts ( 21 , 22 ) in opposite directions.
2 . The linear actuator according to claim 1 , wherein the drive is configured to rotate the nuts ( 21 , 22 ) simultaneously transmitting a substantially identical torque of opposite direction to the respective nuts ( 21 , 22 ).
3 . The linear actuator according to claim 1 , wherein the drive comprises a transmission gear that can be coupled to a motor ( 40 ) for rotating the nuts ( 21 , 22 ).
4 . The linear actuator according to claim 1 , wherein the transmission gear comprises a pinion ( 30 ) which meshes in a perpendicular manner with crown wheels ( 31 , 32 ) integral with the first nut ( 21 ) and the second nut ( 22 ), respectively.
5 . The linear actuator according to claim 1 , wherein the number of teeth on the pinion ( 30 ) is an even number.
6 . The linear actuator according to claim 1 , wherein the shaft ( 10 ), the nuts ( 21 , 22 ) and/or the drive are configured symmetrically with respect to a plane of symmetry perpendicular to the shaft ( 10 ).
7 . The linear actuator according to claim 1 , wherein the threaded sections ( 11 , 12 ) are arranged adjacent to the respective ends of the shaft ( 10 ).
8 . The linear actuator according to claim 1 , wherein the drive comprises at least one motor ( 40 ), each motor ( 40 ) configured to rotate at least one of the nuts ( 21 , 22 ).
9 . A high-pressure pump ( 1 ), comprising a linear actuator according to claim 1 , a ( 61 ) and a second piston ( 62 ), the pistons ( 61 , 62 ) being arranged on respective sides at the ends of the shaft ( 10 ), being able to be alternatively driven by the axial displacement of the shaft ( 10 ) to compress fluid through the pump ( 1 ).
10 . The high-pressure pump ( 1 ) according to claim 1 , comprising a casing ( 50 ) enclosing the shaft ( 10 ), the nuts ( 21 , 22 ) and/or a transmission gear, the nuts ( 21 , 22 ) being arranged fixed to the casing ( 50 ) where they can rotate about the shaft ( 10 ) by means of bearings ( 51 , 52 ).
11 . The high-pressure pump ( 1 ) according to claim 10 , wherein the casing ( 50 ) comprises a housing ( 54 ) configured to contain an oil bath in which the shaft ( 10 ), the nuts ( 21 , 22 ) and/or the transmission gear are immersed.
12 . The high-pressure pump ( 1 ) according to claim 1 , wherein the casing ( 50 ) comprises a side opening ( 53 ) for mechanically coupling the motor ( 40 ) to the linear actuator, the motor ( 40 ) being arranged externally to the casing ( 50 ).