Eccentric Screw Pump Feed Control for Low Starting Torque

The patent applies dynamics by making the feed between rotor and stator variable rather than fixed. The feed unit dynamically adjusts the feed based on operational state: maintaining a first feed during operation for reliable pumping, and reducing to a second feed during rest to prevent elastomer relaxation and deformation. This dynamic adjustment resolves the contradiction between maintaining pumping function and preserving elastomer geometry stability.

The patent applies local quality by making the feed (preload) variable in different operational contexts rather than uniformly applied. Instead of applying increased preload universally, the system applies different feed values: a first feed during operation that provides sufficient sealing, and a reduced second feed during rest that prevents uneven deformation. This localized adjustment of preload based on operational state resolves the contradiction between achieving reliable sealing and maintaining uniform gap geometry.

The patent applies preliminary action by proactively reducing the feed between rotor and stator during rest periods before the pump is restarted. The feed unit automatically transitions to a reduced second feed when the pump is stationary, preventing elastomer relaxation and deformation in advance. This preliminary adjustment of feed during rest reduces starting torque when the pump is restarted, while maintaining simple positioning through automated control.

The patent applies self-service by implementing automated control where the feed unit autonomously adjusts the feed between rotor and stator based on operational state without requiring complex external control systems. The system monitors whether the pump is operating or at rest and automatically transitions between first and second feed values, improving operational reliability while minimizing the addition of complex control infrastructure.