Impeller Installation Tool for Water Pumps
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Solution Overview
Problem
The installation of flexible impellers in water pumps, particularly in marine applications, is challenging due to limited access and the risk of damaging the impeller during manual installation, especially with thicker and more rigid blades.
Innovation Solution
A tool with an upper portion featuring an inclined interior impeller engaging surface and a lower cylindrical portion with a thin wall, allowing for uniform deformation and alignment of the impeller blades, facilitating easier insertion and positioning without damaging the impeller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual installation method is used, then installation flexibility is maintained, but installation difficulty increases and impeller damage risk increases
Solution Approach 1:
The patent introduces an installation tool as an intermediary device between the installer and the impeller. This tool includes a cavity that receives the impeller and provides controlled deformation through cam surfaces, eliminating the need for direct manual manipulation that risks impeller damage while maintaining installation flexibility.
Solution Approach 2:
The installation tool performs preliminary deformation of the impeller blades using cam surfaces before final installation. The cam surfaces gradually deform the blades to match the impeller cavity shape, preparing the impeller for proper seating and alignment without requiring forceful manual manipulation during the actual installation.
2Productivity
If screw drivers or other forcing tools are used, then impeller installation is facilitated, but impeller damage occurs
Solution Approach 1:
The installation tool serves as a protective intermediary that transmits installation forces uniformly through its cavity walls and cam surfaces. This eliminates the concentrated point loads from screwdrivers that could crack or deform the impeller blades, while still providing sufficient force to overcome blade rigidity in larger pumps.
Solution Approach 2:
The tool changes the distribution parameters of installation forces. Instead of concentrated forces from manual tools, the cavity walls and cam surfaces distribute forces uniformly across the impeller blades, transforming the stress state from localized high-stress points to distributed low-stress areas that prevent damage.
3Strength
If thicker and more rigid impeller blades are used, then pump performance is improved, but installation difficulty increases
Solution Approach 1:
The cam surfaces in the installation tool perform preliminary deformation of the rigid blades before final installation. By gradually bending the blades against the cam surfaces during tool rotation, the rigid blades are pre-formed to match the cavity shape, eliminating the need for forceful manipulation that would be required without this preliminary deformation step.
Solution Approach 2:
The installation tool introduces dynamic rotation during the deformation process. As the tool rotates on the shaft, the cam surfaces dynamically deform the blades through a controlled motion path, allowing rigid blades to be gradually bent into position without sudden force applications that would exceed material limits.
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 tool enables efficient and damage-free installation of flexible impellers by minimizing compression and ensuring proper alignment with the water pump shaft, maintaining the impeller's integrity and simplifying the installation process, even in restricted spaces.
Implementation Method 1
causing uniform rearward deformation of the impeller blades about the central impeller axis
Implementation Method 2
The friction between the engaged impeller hub and pump shaft will maintain the impeller in place on the shaft
Data Source
AI summary
A tool for installing a flexible impeller on a drive shaft in the impeller cavity in a water pump including a gripping surface extending about an upper portion of the tool and an open ended channel extending axially through the tool for receiving and releasably retaining a flexible impeller therein in a compressed state. The channel has an upper portion circumscribed by an annular outwardly inclined impeller abutment surface and a lower constant radius portion circumscribed by a depending cylindrical wall. The inclined impeller abutment surface terminates in the constant radius portion.