Two-Part Wear Plate Scraper for Solids-Handling Centrifugal Pumps
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Solution Overview
Problem
Centrifugal pumps used for conveying media containing solids, particularly waste water, face issues with fibrous materials wrapping around impeller blades, leading to frequent maintenance and reduced efficiency, and existing scraping solutions suffer from mechanical stress and damage due to shock-like loads.
Innovation Solution
A centrifugal pump design featuring a mating element composed of two parts, where the first part is hard and abrasive-resistant, and the second part is elastic and shock-resistant, allowing for effective scraping without permanent mechanical stress, with a groove for efficient removal of deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard and brittle material is used for the scraper finger to provide abrasion resistance, then wear protection is improved, but the scraper finger suffers fracture-like damage under shock-like loads
Solution Approach 1:
The scraper element is divided into two distinct parts: a hard first part (body) made of wear-resistant material for abrasion resistance, and a more ductile second part (finger) for shock resistance. This segmentation allows each part to perform its specialized function without compromising the other.
Solution Approach 2:
The scraper element uses composite construction with two different materials having complementary properties - a hard, abrasive-resistant material for the body and a more ductile material for the finger portion. This composite approach resolves the contradiction between hardness and shock resistance.
2Ease of operation
If a stationary scraper is used to scrape along the blade edge, then deposits are removed, but the construction is subjected to high mechanical stress
Solution Approach 1:
The scraper element is designed to be elastically deformable rather than completely rigid. The ductile second part allows the scraper to flex and absorb shock loads dynamically, reducing mechanical stress while maintaining scraping functionality.
3Reliability
If the scraper element is designed to be elastic and shock-resistant, then damage from shock loads is prevented, but abrasion resistance may be reduced
Solution Approach 1:
The scraper element is divided into two distinct parts: a hard first part (body) made of wear-resistant material for abrasion resistance, and a more ductile second part (finger) for shock resistance. This segmentation allows each part to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the scraper element have different material properties optimized for their specific functions - the first part (body) is hard and abrasive-resistant where it contacts the pump housing, while the second part (finger) is more ductile where it contacts the impeller blades. This local quality differentiation resolves the contradiction between shock resistance and abrasion resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The two-part mating element design enhances durability and reliability, preventing damage from abrasive and shock-like loads while maintaining pump efficiency and simplicity of assembly, with low production costs.
Implementation Method 1
centrifugal pump for conveying media containing solids, having an open impeller having at least one blade and a mating element interacting therewith
Implementation Method 2
an element which protrudes into the suction eye of the centrifugal pump and interacts with a leading edge of the at least one blade of the open impeller
Data Source
AI summary
A centrifugal pump is configured to convey media containing solids. The centrifugal pump includes an open impeller. The open impeller has at least one blade and a mating element interacting therewith. The mating element includes an element which protrudes into a suction eye of the centrifugal pump and interacts with a leading edge of the at least one blade of the open impeller. The mating element is configured in two parts, a first part and a second part. The two parts are configured to render the element elastic.