Plastic Metering Pump Rotor Blade Shoe Sealing Design

The pump chamber is divided into discrete dosing compartments formed by the rotor blades and housing walls. Each compartment represents a fixed volume chamber that ensures consistent dosing. The segmentation of the fluid path into discrete volumes eliminates variable stroke path issues and ensures precise delivery regardless of operating conditions.

Instead of using rolling blade elements that crush particles through mutual contact, the invention uses a single rotating rotor with blades that move parallel to the housing wall. The rotor blades transport solid-liquid mixtures by pushing against the stationary housing surface, inverting the traditional approach where moving parts contact each other. This eliminates particle crushing while maintaining adaptability to solid particles of various sizes.

The rotor blades are designed with specific local geometric properties including optimized leading and trailing edge shapes, appropriate thickness distribution, and controlled clearance to the housing wall. These local quality features enable the blades to transport solid particles without grinding while maintaining sealing effectiveness. The blade geometry is specifically tailored to push particles along the housing surface rather than crush them.

The harmful crushing action is extracted and removed from the system by eliminating the mutual rolling contact between blade elements. The design extracts only the beneficial particle transport function while removing the harmful particle size reduction effect. This separation of functions maintains conveying capacity for solid-liquid mixtures while preventing blockages and coating formation that reduce reliability.