Centrifugal Pump Anti-Air Locking System with Adjustable Vanes
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Solution Overview
Problem
Centrifugal pumps often experience air-locking issues when handling gas or multiphase fluids, leading to reduced performance and potential damage due to suction recirculation, which is difficult to prevent and requires manual intervention or external systems that are ineffective.
Innovation Solution
The implementation of strategically positioned stationary and replaceable anti-rotation vanes within the centrifugal pump's intake structure and priming chamber to break up swirling fluid and create cross-stream mixing, preventing air pockets from forming at the impeller entrance, thereby automatically purging air without the need for external vent lines or modifications to the impeller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pump operates at off-peak performance capacity, then the pump can handle varying flow rates, but suction recirculation occurs causing air-locking
Solution Approach 1:
The pump inlet is divided into multiple sectors with individual adjustable inlet guide vanes, allowing each sector to be optimized independently for different operating conditions. This segmentation enables the pump to maintain reliable operation across varying flow rates by adjusting vanes to prevent suction recirculation in each sector
Solution Approach 2:
The inlet guide vanes are made adjustable rather than fixed, allowing dynamic adaptation to different operating conditions. The vanes can be repositioned based on flow rate requirements to maintain optimal suction conditions and prevent air-locking across the full operating range
2Reliability
If manual intervention is used to stop and start the pump to break air-locking, then the pump can temporarily regain performance, but continuous monitoring is required and the problem recurs
Solution Approach 1:
The adjustable inlet guide vanes enable the pump to automatically prevent air-locking conditions through proper flow distribution, eliminating the need for manual intervention. The system self-regulates to maintain reliable operation by preventing the root cause of air-locking rather than merely responding to its effects
3Reliability
If external vent lines or priming systems are added to prevent air-locking, then air can be removed from the pump, but the device complexity increases and these systems are often ineffective
Solution Approach 1:
The solution extracts and addresses the root cause of air-locking (improper flow distribution at the inlet) rather than adding external systems to remove air after it enters. By correcting the inlet flow conditions, the need for external vent lines or priming systems is eliminated
4Strength
If the pump operates with air-locking, then the pump structure remains intact, but performance is reduced and internal damage occurs over time
Solution Approach 1:
The adjustable inlet guide vanes prevent air-locking conditions before they can cause damage by ensuring proper flow distribution at the inlet. This preliminary prevention protects both performance and structural integrity by eliminating the harmful recirculation conditions before they occur
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
This solution effectively prevents air-locking, allowing centrifugal pumps to operate continuously without performance loss or internal damage, even during off-peak conditions or when handling fluids with low vapor pressures or solids, without requiring constant monitoring or external assistance.
Implementation Method 1
a portion of the flow is redirected out of the impeller eye (instead of through the impeller exit vane tips) in a swirling motion
Implementation Method 2
the heavier fluid is thrown outward by the centripetal action of the rotating impeller blades while the lighter vapor (air) is centrifuged toward the center of rotation
Data Source
AI summary
A priming system for preventing air-locking for use on a centrifugal pump having a priming system with a two piece detachable design. This permits the upper portion of the priming system to be removed for routine maintenance. The lower portion of the priming system includes a plurality of primary stationary vanes located longitudinally in the flow path of multi-phase fluids (air and water) which permit the removal of trapped air. Additional removable secondary vanes are located in the flow path after the primary stationary vanes and prior to the intake structure of the centrifugal pump housing. Such multiple vane structure allows the centrifugal pump to pump multi-phase fluids during a wide variety of conditions without air-locking and without requiring any modifications to the centrifugal pump impeller.