Centrifugal Pump Impeller Vane Segmentation for Air-Lock Prevention
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Solution Overview
Problem
Conventional marine bilge pumps are prone to air-lock due to restricted downstream outlets and traditional solutions like drilling a small hole at the pump outlet lead to fluid leakage, making the pumps appear defective.
Innovation Solution
A centrifugal pump design featuring an impeller with axially protruding vanes and a volute with radially extending ridges that expel air away from the upstream inlet, preventing air-lock without fluid leakage by carefully configuring the impeller vanes and ridges to ensure efficient air expulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small hole is drilled at the pump outlet to allow air to escape, then air-lock is prevented, but fluid leakage occurs making the pump appear defective
Solution Approach 1:
The pump outlet is segmented into multiple smaller passages instead of a single large outlet, allowing air to escape through multiple paths while maintaining fluid containment. The impeller vanes are also segmented to create multiple air expulsion paths.
Solution Approach 2:
The impeller vanes act as an intermediary mechanism between the volute cavity and the outlet, actively expelling air through their rotational motion while the volute ridges guide the air flow paths, preventing direct fluid leakage while maintaining air venting function.
2Adaptability or versatility
If the downstream outlet is restricted to fit non-return valves, then valve compatibility is improved, but air-lock occurs
Solution Approach 1:
The solution moves from modifying the outlet geometry (2D/3D shape changes) to introducing a temporal dimension through rotational impeller vanes that actively expel air during operation, creating a dynamic air expulsion mechanism that works with restricted outlets.
Solution Approach 2:
The volute ridges and impeller vane configuration are designed in advance to create predetermined air flow paths and expulsion zones, preparing the system to handle air accumulation before it causes air-lock, rather than reacting to air-lock conditions.
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 effectively prevents air-lock in marine bilge pumps while maintaining fluid integrity, ensuring the pumps operate effectively without appearing defective due to leakage.
Implementation Method 1
The impeller comprises a plurality of impeller vanes and is configured to rotate about an axis of rotation so that the plurality of impeller vanes accelerates the fluid radially outwardly from the upstream inlet to the downstream outlet
Implementation Method 2
The impeller is uniquely configured to discourage air-lock of the centrifugal pump by expelling air away from the upstream inlet as the impeller rotates about the axis of rotation
Data Source
AI summary
A centrifugal pump for pumping fluid includes a volute having an upstream inlet that receives the fluid and a downstream outlet that discharges the fluid. An impeller is disposed in the volute and comprises a plurality of impeller vanes. The impeller is configured to rotate about an axis of rotation so that the plurality of impeller vanes accelerates the fluid radially outwardly from the upstream inlet to the downstream outlet. The impeller is further configured to discourage air-lock of the centrifugal pump by expelling air away from the upstream inlet as the impeller rotates about the axis of rotation.