Grinding Pump Cutting System with Recessed Disc for Floating Matter Discharge
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Solution Overview
Problem
Conventional grinding pumps face issues with floating matters becoming lodged between cutting blades and discs, leading to reduced efficiency and potential motor overload, due to small gaps between these components which hinder the cutting and transport of solid or semi-solid particulates.
Innovation Solution
The cutting system incorporates a cutting disc with recessed areas between orifices, creating axial gaps between the rotating cutter and disc, allowing for effective cutting and discharge of floating matters without causing the rotating shaft to stick, featuring a ring-shaped cutting protrusion with dual cutting edges and diversion ribs for enhanced cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting blades and cutting disc are positioned with very small gaps to improve cutting precision, then cutting effectiveness is improved, but floating matters become lodged and stuck between them causing the rotating shaft to stick
Solution Approach 1:
The patent introduces a third dimension (axial direction) by creating recessed areas on the cutting disc surface. This allows the cutting edges to remain in close contact for effective cutting while providing axial clearance space for floating matters to pass through without becoming lodged between the cutting blades and disc, thus resolving the contradiction between cutting precision and operational reliability
Solution Approach 2:
The cutting disc surface is designed with non-uniform structure: raised areas with cutting edges for precise cutting, and recessed areas for discharge clearance. This local differentiation allows different regions to serve different functions - cutting precision where needed and clearance where matters pass through, resolving the contradiction between close gap cutting and prevention of sticking
2Productivity
If the cutting blades and cutting disc are positioned with very small gaps to improve cutting effectiveness, then cutting efficiency is improved, but floating matters impede transport causing impeller or cutting blades to be stuck
Solution Approach 1:
By adding axial dimension through recessed areas, the patent enables floating matters to be discharged in the axial direction rather than being constrained in the radial gap space. This provides an additional escape path that maintains cutting efficiency while preventing transport blockages
Solution Approach 2:
The recessed areas effectively extract or remove the discharge function from the cutting interface. Floating matters are taken out of the cutting zone through the recessed areas before they can impede transport or cause sticking, separating the cutting function from the discharge function
3Ease of manufacture
If the cutting structure is designed with simple flat surfaces for ease of manufacture, then manufacturing simplicity is improved, but floating matters become lodged in gaps causing motor overload or stall
Solution Approach 1:
Rather than making the entire cutting structure complex, the patent applies local quality by adding recessed areas only in specific regions where discharge is needed. The majority of the structure remains simple and manufacturable, while the localized recessed features provide the necessary clearance to prevent matter lodgement and motor overload
Data Source
AI summary
A cutting system for a grinding pump, including a cutting disc attached to the pump near an inlet and having a cutting surface with multiple cutting orifices, and a rotating cutter attached to the rotating shaft of the pump and having two cutting blades, each blade having a cutting edge on a forward-facing side of the rotating cutter. The rotating cutter is located on the upstream side of the cutting disc, and cooperates with the cutting orifices of the cutting disc to perform cutting actions. Each cutting orifice has a hole extending from the cutting surface through the cutting disc to form a feeding orifice, and a cutting protrusion protruding from the cutting surface and surrounding the hole region. The multiple cutting orifices define recessed areas of the cutting surface between the cutting orifices. The cutting system can prevent uncut floating matters from being trapped, and is effective and safe.