Screw pump or machine with a liner that bends and/or pivots with the rotors

A screw pump comprising:

• a casing including a chamber;
• first and second rotors rotatably positioned within the chamber of the casing, the first and second rotors including intermeshing threaded-shape profiling;
• and
• a liner positioned between the casing and the first and second rotors;
• wherein the liner includes a first segment and a second segment, the first and second segments being arranged and configured to pivot relative to each other;
• wherein the liner is arranged and configured to bend and/or pivot under axial forces experienced during pump operation so that the liner approximates bending of the first and second rotors during operation;
• wherein the liner includes an intermediate coupling mechanism positioned between the first and second segments, the coupling mechanism being arranged and configured to induce an asymmetric stiffness between the first and second segments;
• and
• wherein the coupling mechanism includes at least one spring positioned between the first and second segments.