Patent NO-20161247-A1 (NO)
Inventor: MARTINSEN TORD
IPC: F16F9/06
Filed: 2016-07-29
Abstract: Active heave compensator(100)comprising a hydraulicactuator(lO), comprising of a first cylinder (1) having an upperend and a lowerend, a first piston rod (13)connected to a first piston (12) and extending downwardly therefromthrough the lowerend of the first cylinder (11), adapted for reciprocation with respectthereto, connection means (14) mounted at the upperand lowerend of the hydraulicactuator(10)adapted for connecting the active heavecompensator (100)to a floating object, like a vessel (102) mounted crane, and a payload (101), a first volume (VI), filled with hydraulic fluid, located between the first piston (12) and the lowerend of the first cylinder (11), a second volume (V2), filled with gas atany pressure including zero, located between the first piston (12) and the upperend of the first cylinder (11), a double a eting gas accumulator (30), comprising of a fourth cylinder (31), a ring shaped piston (32) mounted concentrically within the fourth cylinder (31) and adapted for reciprocation with respect thereto, where the lowerend of the ring shaped piston (32) is on the same side as the lowerend of the fourth cylinder (31) when ring shaped piston (32) is at zero stroke, a Third inner cylinder (33) mounted concentrically within the fourth cylinder (31) and fixed to the upperend of the fourth cylinder (31) with a leaktight connection, a fourth inner cylinder (35) mounted concentrically inside the fourth cylinder (31) and connected to the upperend of the ring shaped piston (32) with a leaktight connection, a cylinder end (34) mounted concentrically with the fourth cylinder (31) at the upperend of the fourth inner cylinder (35) with a leaktight connection, a fifth inner cylinder (36) mounted concentrically with the fourth cylinder (31) at the lowerend of the fourth cylinder (31) in a leaktightmanner, where the assemblyconsisting of the ring shaped piston (3 2), the fourth inner cylinder (35) and the cylinder end (34) is adapted to reciprocate inside the fourth cylinder (31), inside the third inner cylinder (33) and outside the fifth inner cylinder (36) in a leaktight manner, a Sixth volume (V6), filled with hydraulic fluid, located between the cylinder end (34), the inside of the fourth inner cylinder (35), the fifth inner cylinder (36) and the lowerend of the first cylinder (31), a seventh volume (V7), filled with hydraulic fluid, located between cylinder end (34), the outside of the fourth innercylinder (35), the inside of the third innercylinder (33) and the upperend of the first cylinder (31), neighth volume (V8), filled with hydraulic fluid, located between the ring shaped piston (32), the outside of the fifth inner cylinder (36) and the lowerend of the first cylinder (31), a ninth volume (V9), filled with gas atany pressure, located between the inside the fourth cylinder (31), the upperend of the fourth cylinder (31), the outside of the third inner cylinder (33), the outside of the fourth innercylinder (35) and the upperend ofthe ring shaped piston (32), a second gas accumulator (60), consisting of a seventh cylinder (61) and a fifth piston (62), adapted for reciprocation with respectthereto, a seventeenth volume (V14), filled with hydraulic fluid, located between the upperend of the seventh cylinder (61) and the upperend of the fifth piston (62), an eighteenth volume (V15), filled with gas at any pressure, located between the lowerend of the seventh cylinder(61)and the Iowerend of the fifth piston (62), a conduitmeans between the first volume (VI) and the eighth volume (V8),