Pump Impellor Removal Using Impact Torque and Rotation Bracing
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Solution Overview
Problem
Existing impellor wrenches fail to provide sufficient force to unthread a stuck impellor from a pump shaft due to thread galling, making it difficult to uncouple the impellor from the shaft.
Innovation Solution
A method and system using an impact wrench with a socket and an elongated brace to prevent impellor rotation while applying continuous torque, utilizing a hammer mechanism to break free galled threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a standard impellor wrench is used to unthread the impellor, then the wrench can be applied to the impellor, but the force applied is insufficient to break free galled threads
Solution Approach 1:
The impact wrench delivers periodic hammer impacts to the drive shaft, creating sudden torque pulses that shock the galled threads apart. This periodic impact action is far more effective at breaking free seized threads than continuous steady torque from a standard wrench.
Solution Approach 2:
The invention changes the torque application parameter from steady continuous force to intermittent impact force. The impact wrench converts rotational motion into hammer blows, delivering high-magnitude torque pulses that exceed the static friction of galled threads.
2Force
If continuous torque is applied to the drive shaft without preventing impellor rotation, then the impellor may rotate with the shaft, but the torque is not effectively transmitted to unthread the impellor
Solution Approach 1:
The system segments the impellor-shaft connection by introducing a brace that independently constrains the impellor from rotating. This separates the rotation control function from the torque application function, allowing torque to be applied to the shaft while the impellor remains stationary relative to the threading direction.
Solution Approach 2:
The brace acts as an intermediary element between the impellor and the stationary structure. It prevents impellor rotation by transferring reactive forces to the stationary support, enabling the impact wrench to apply torque to the shaft without the impellor rotating away.
3Productivity
If the impellor is constrained from rotating in one direction while torque is applied, then the torque can unthread the impellor, but the system requires additional components to prevent rotation
Solution Approach 1:
The brace serves multiple functions: it prevents impellor rotation, transmits reaction forces to the stationary structure, and positions the impact application point. This multi-functionality reduces the need for separate specialized components for each function.
Solution Approach 2:
Instead of trying to make the wrench itself prevent impellor rotation, the invention inverts the approach by using a separate brace attached to stationary structure to prevent rotation, while the wrench simply applies torque to the shaft.
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
Effectively removes a stuck impellor from the pump shaft without damaging the shaft, by applying impact forces to unthread the impellor threads.
Implementation Method 1
the torque comprises continuous hammer impacts
Data Source
AI summary
A method for removing a pump impellor from an operatively associated pump shaft is provided. The method includes preventing rotation of the pump impellor in a first direction and simultaneously applying a torque to the pump shaft in the first direction, whereby the torque comprises continuous hammer impacts. A brace is used to prevent the rotation of the pump impellor, wherein the brace is fixed on a second end opposite the first end preventing rotation. A bolt connected to pump may fix the second end. An impact wrench with a socket having a shaft key operatively associated with the pump shaft notch may provide the simultaneous application of the torque.