Pump Rotor Vane Segmentation for Waste Water Handling
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Solution Overview
Problem
Centrifugal pumps used for conveying waste water face issues such as limited specific speed of rotation, pulsation, vibration, clogging, low efficiency, and accumulation of contaminants, particularly rags and textiles, leading to increased maintenance and potential failures.
Innovation Solution
A pump rotor design featuring a first vane with a helical wheel part and a centrifugal wheel part fixedly connected to a hub, along with a second vane having a helical wheel part and a centrifugal wheel part not directly connected to the hub, forming a throughgoing gap in the direction of rotation, which prevents contaminant deposition and enhances efficiency by allowing continuous cleaning of the surface beneath it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a centrifugal pump uses a helical centrifugal wheel of open design, then it can convey waste water, but the specific speed of rotation is limited and pulsation and vibration occur
Solution Approach 1:
The pump rotor is segmented into multiple independent vanes (at least two vanes) arranged around the hub, each vane being separately connected to the hub. This segmentation allows the vanes to operate independently, reducing pulsation and vibration while maintaining the ability to handle waste water with contaminants.
Solution Approach 2:
The vanes are designed with a specific geometric configuration including a front edge, rear edge, leading end, and trailing end, allowing dynamic fluid flow through the vanes during rotation. The vanes are arranged to create continuous flow paths that reduce pulsation while maintaining adaptability to waste water conditions.
2Productivity
If a centrifugal pump rotor includes two vanes, then it can increase conveying capacity, but it tends to clog and has low efficiency when conveying waste water
Solution Approach 1:
Different regions of the vane structure have optimized local properties: the front edge is designed to cut through contaminants, the trailing end has specific geometry to prevent rag accumulation, and the vanes are positioned at specific angles to create optimal flow paths that prevent clogging while maintaining high conveying capacity.
Solution Approach 2:
The vane geometry extends in multiple dimensions with specific length, width, and angular positioning. The vanes have a three-dimensional configuration with front and rear edges, leading and trailing ends, creating complex flow paths that prevent contaminants from accumulating while maintaining high productivity.
3Reliability
If the second centrifugal wheel vane part is not directly connected to the hub, then a throughgoing gap is formed that prevents contaminant deposition, but the structural complexity increases
Solution Approach 1:
The second centrifugal wheel vane part is segmented from direct connection to the hub, creating a throughgoing gap. This segmentation prevents contaminants from depositing in the space between the hub and vane while maintaining structural integrity through alternative connection methods at the outer edge.
Solution Approach 2:
The direct connection between the second centrifugal wheel vane part and the hub is extracted/removed, creating a gap. This extraction prevents contaminant accumulation in that space while the vane remains functionally connected to the rotating assembly through the connection means at the outer edge.
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 design results in a pump rotor that operates reliably with reduced maintenance, increased conveying rate, improved efficiency, minimized pulsation and vibration, and easier balancing and machining, making it suitable for handling waste water and other liquids with solids.
Implementation Method 1
a pump rotor (1) which is rotatable about an axis of rotation (D) and includes a first vane (3) which is fixedly connected to the hub (2)
Implementation Method 2
The first vane (3) includes a first helical wheel vane part (3a) which merges into a first centrifugal wheel vane part (3b)
Data Source
AI summary
The pump rotor (1) comprises a first blade (3), wherein the first blade (3) comprises a first helical-gear blade part (3a) and, adjoining the latter, a first centrifugal-wheel blade part (3b), and said pump rotor (1) comprises a hub (2) with a rotational axis (D), wherein the centrifugal-wheel blade part (3b) is fixedly connected to the hub (2), wherein at least one second blade (4) is provided which comprises a second helical-gear blade part (4a) and, adjoining the latter, a second centrifugal-wheel blade part (4b), wherein the first and the second blades (3,4) have in each case one outer edge (3c,4c), wherein a connecting means (5) connects the first and second blades (3,4) to one another in the region of the outer edge (3c,4c), and wherein the second centrifugal-wheel blade part (4b) is arranged so as to run relative to the hub (2) in such a way that an opening (6) which runs continuously in the rotational direction (D1) is formed between said second centrifugal-wheel blade part (4b) and hub (2), since the second centrifugal-wheel blade part (4b) is not directly connected to the hub (2).