Critical rotating/reciprocating elements in positive displacement pumps that create fluid movement through mechanical displacement.
Rotors, gears, and pistons are precision-engineered components in positive displacement pumps that mechanically trap and transfer fluid volumes. Rotors (including lobes, screws, or vanes) and gears (external or internal) rotate to create cavities, while pistons reciprocate within cylinders. These components maintain constant flow rates proportional to speed, independent of system pressure, making them ideal for viscous fluids, metering applications, and high-pressure systems.
诱因 → 失效模式 → 工程缓解
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Rotors use rotational motion with continuous sealing (as in gear or lobe pumps), while pistons use linear reciprocating motion with periodic sealing via check valves. Rotors typically handle higher flow rates with smoother output, while pistons achieve higher pressures with more pulsation.
Material selection depends on fluid properties (corrosiveness, abrasiveness), operating pressure, temperature, and lubrication. Stainless steel for corrosive fluids, hardened steel for high pressure/wear, and engineered polymers for chemical resistance or where metal contamination must be avoided.
Common causes include cavitation (vapor bubble collapse), abrasive particles in fluid, misalignment, inadequate lubrication, operation beyond design pressure/temperature, and material incompatibility with pumped media.
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