Packing Stack Clip Assembly for Coaxial Pump Seal Installation
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Solution Overview
Problem
Packing rings in piston pumps, used for sealing abrasive and viscous fluids, are difficult to handle and install in a stacked arrangement due to the risk of falling out of coaxial alignment, which affects the proper alignment within the cylinder and piston.
Innovation Solution
A clip with a spine and brackets is used to hold and align a stack of packing rings, allowing them to be slid onto a piston and then laterally removed, ensuring coaxial alignment and preventing separation during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If packing rings are stacked and handled without a carrier device, then the installation process requires individual placement of each ring, but the packing rings fall out of coaxial alignment and become difficult to handle
Solution Approach 1:
A clip device serves as an intermediary carrier that temporarily holds the stacked packing rings in coaxial alignment during handling and installation. The clip includes a body with a cavity that receives the packing stack and maintains their relative positions, allowing the entire stack to be installed as one unit rather than requiring individual placement of each ring.
Solution Approach 2:
The packing rings are pre-assembled into a stacked configuration within the clip cavity before installation. This preliminary assembly ensures that all rings are in the correct coaxial alignment and order (such as alternating leather-synthetic-leather-synthetic) before they are transferred to the pump, preventing misalignment during the installation process.
2Stability of the object's composition
If packing rings are stacked tightly together, then the stack maintains its configuration, but the rings cannot be individually adjusted or replaced
Solution Approach 1:
The clip design allows the packing stack to be segmented for replacement. The clip includes a release mechanism or removable components that allow the entire stack to be easily removed as one unit. Once removed, the individual rings can be separated and replaced independently if needed, while maintaining the stable stacked configuration during normal operation.
3Reliability
If multiple packing rings are stacked for installation, then the sealing effectiveness is improved, but the handling complexity and risk of misalignment increases
Solution Approach 1:
The clip combines multiple packing rings into a single integrated assembly for handling. The cavity of the clip body receives and holds the entire stack of rings (typically 6 or more rings arranged in alternating material composition) as one unified unit. This merging allows the multi-ring stack to be installed, removed, and handled as a single component, significantly reducing handling complexity while maintaining the sealing effectiveness provided by multiple rings.
Data Source
AI summary
A packing assembly includes a clip configured to hold a packing stack in a desired arrangement on a longitudinal axis. The clip includes upper arms and lower arms through which the packing stack and slide laterally into and out of the clip. The upper arms and lower arms prevent radial movement of the packing stack and can further prevent axial movement of the packing stack relative to the clip. The clip facilitates installation of the packing stack on a piston by shifting the assembled packing stack axially onto the piston and then pulling laterally off of the packing stack while leaving the packing stack on the piston rod.