ELECTROHYDRAULIC PUSHER Russian patent published in 2000 - IPC

FIELD: hoisting-and-conveying machinery; block brakes of hoisting-and conveying machines. SUBSTANCE: pusher has reversing drive motor, cylinder-accommodating pusher case placed above motor and filled with working fluid, piston with rod passed through hub of pusher case top part. Pump housing is installed on motor board. Drive motor shaft mounts impeller with radial blades Z₁ whose entrance edge is inclined to pump axis through angle α₁ and whose top radius is approximately equal to radius R₀ of pump housing inlet bore. Diffuser grid is mounted above cylinder, impeller is placed between pump housing and diffuser grid, radial blades Z₁ of impeller are arranged uniformly and symmetrically. Coefficient of flow constraint K₁ at entrance edges of blades Z₁ is between 1.1 and 1.15. Additional radial blades Z₂ are uniformly and symmetrically arranged between mentioned blades Z₁, angle of inclination of their entrance edge to pump axis being α₂≤ α₁, entrance edge top radius R₂₀ is greater than pump housing bore radius R₀ and ranges within K₁R₀≤R₂₀≤(K₁-1)/2)R₀. EFFECT: reduced pressure loss of liquid, improved speed of pusher. 3 dwg, 1 tbl