Inner barrel composite cylinder type active and passive combined linear heave compensation device

Abstract

The invention discloses an inner barrel composite cylinder type active and passive combined linear heave compensation device, which belongs to the technical field of ocean engineering equipment and adopts an inner barrel composite hydraulic cylinder with four functional cavities as a compensation power coupling device, and a liquid-gas energy storage device is connected with a rod cavity of the inner barrel composite hydraulic cylinder. Therefore, a passive compensation force is provided on the piston rod of the composite hydraulic cylinder; a hydraulic pump is connected with two active cavities of an inner barrel composite hydraulic cylinder, active compensation force capable of controlling the size and the direction is provided on a piston rod of the composite hydraulic cylinder through a closed hydraulic loop, and the passive compensation force and the active compensation force jointly drive the composite hydraulic cylinder to achieve the heave compensation function. The response speed and the control precision in the compensation process are improved through bidirectional active control of the inner barrel composite hydraulic cylinder and a differential hydraulic loop; the working state of the gas cylinder is adjusted through the swing oil cylinder, and flexible switching of multiple working modes is achieved. In addition, deepwater high-pressure environment pressure acts on the end portions of a piston rod of the composite hydraulic cylinder and a piston rod of the water depth compensation hydraulic cylinder at the same time, a rodless cavity of the composite hydraulic cylinder is connected with a rodless cavity of the water depth compensation hydraulic cylinder, and the deepwater pressure compensation function is achieved through pressure interaction offset. Various operation modes and functions such as passive compensation, active compensation and deepwater pressure compensation are achieved, and the device has the advantages of being novel in structure, compact in system, capable of integrating multiple functions, high in compensation precision, high in response speed and the like.

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