Integrated Pump Shaft Packing Gland-Bushing for Leak Control
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Solution Overview
Problem
Fluid pumps with rotating shafts often experience leakage due to the inefficiencies in traditional two-piece packing gland and bushing systems, which are difficult to maintain and require separate removal and replacement of components, and cannot handle high lubricant pressures without causing lip seal failure.
Innovation Solution
A one-piece combination packing gland and bushing component is introduced, featuring an internal seal and a slip-fit configuration with the shaft, allowing for higher lubricant pressures and eliminating the need for packing material, with a design that includes a proximal end for compression and a distal end for bearing, along with inner and outer gasket channels to mitigate leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-piece packing gland and bushing system is used, then the components can be separately manufactured and installed, but the system becomes difficult to maintain and requires separate removal and replacement of components
Solution Approach 1:
The patent combines the packing gland and bushing into a single integrated component. The packing gland includes an integrated bushing portion that receives the shaft, eliminating the need for separate bushing and gland components. This integration simplifies maintenance as the entire sealing assembly can be removed and replaced as one unit, directly resolving the maintenance difficulty issue while maintaining manufacturing flexibility.
2Device complexity
If traditional packing gland and bushing systems are used, then the structure is simple, but fluid leakage occurs due to inefficiencies in sealing
Solution Approach 1:
The integrated packing gland-bushing assembly ensures better sealing by eliminating gaps and misalignment issues between separate components. The bushing portion is directly formed as part of the packing gland, creating a continuous sealing surface that prevents fluid leakage while maintaining structural simplicity.
Solution Approach 2:
The patent utilizes a lip seal configured to engage with the shaft, where the lip seal acts as a flexible element that maintains contact with the rotating shaft. This flexible sealing mechanism adapts to shaft wear and maintains effective sealing, preventing fluid leakage while keeping the overall structure relatively simple.
3Use of energy by moving object
If high lubricant pressures are applied, then lubrication effectiveness increases, but lip seal failure occurs in traditional systems
Solution Approach 1:
The integrated design provides better structural support for the lip seal, as the packing gland body reinforces the seal assembly. This combined structure distributes the high lubricant pressures more effectively across the sealing interface, preventing lip seal failure while maintaining high-pressure lubrication effectiveness.
Solution Approach 2:
The packing gland is constructed from materials with high strength and pressure resistance properties, providing a robust housing for the lip seal. This material selection enables the system to withstand high lubricant pressures without compromising lip seal integrity, thereby maintaining both lubrication effectiveness and seal durability.
4Reliability
If packing material is used in the shaft seal, then fluid leakage is mitigated, but the system requires more components and complexity
Solution Approach 1:
The patent eliminates the need for separate packing material by integrating the sealing function directly into the bushing and lip seal components. The lip seal and bushing assembly provides the sealing action that would otherwise require additional packing material, reducing the total number of components while maintaining effective fluid leakage mitigation.
Data Source
AI summary
One or more techniques and/or systems are disclosed for mitigating fluid loss or leakage from a fluid pump with a rotating shaft driving a pumping mechanism. A one-piece, combined packing gland-bushing component can have an internal seal that allows for use of lubricants at higher pressures. Further, the combined packing gland-bushing component can be configured with a removal component that allows for easier removal of the packing gland-bushing component from a pump shaft, and shaft packing box.