Flexible Packing Holder for Coaxial Pump Seal Insertion
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Solution Overview
Problem
Packing rings used in piston pumps, particularly for abrasive and viscous fluids like paint, are difficult to handle and install due to their tendency to fall out of coaxial alignment when not properly secured, leading to improper sealing and leakage.
Innovation Solution
A packing holder with a handle and axially extending fingers that flex to accommodate the packing stack, allowing for coaxial alignment and secure insertion into the pump cylinder, along with a retainer to maintain the stack's position during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packings are arranged in a stacked configuration to achieve proper sealing, then sealing effectiveness is improved, but handling and installation difficulty increases due to misalignment tendency
Solution Approach 1:
The packing holder is segmented into multiple flexible fingers that can independently deflect during insertion. This segmentation allows each finger to adapt to the cylinder bore dimensions while maintaining the overall coaxial alignment of the packing stack, resolving the conflict between stacked configuration reliability and installation ease.
Solution Approach 2:
The fingers of the packing holder are designed with variable stiffness characteristics, being more flexible at the insertion end and stiffer toward the handle. This parameter change allows the holder to deflect during insertion to accommodate dimensional variations, then maintain rigid coaxial alignment once inserted, thereby improving both installation ease and sealing effectiveness.
2Reliability
If packings are mounted in a stacked arrangement to prevent leakage, then sealing performance is improved, but alignment stability deteriorates when not secured
Solution Approach 1:
The packing holder pre-aligns the entire packing stack in coaxial configuration before insertion into the cylinder. By establishing the correct alignment configuration in advance during handling and insertion, the holder ensures that once the packings are installed and the holder removed, the packings maintain their coaxial arrangement and alignment stability without requiring additional securing mechanisms.
Solution Approach 2:
The packing holder acts as an intermediary tool that temporarily maintains the coaxial alignment of the packing stack during handling and insertion. This intermediary device allows the packings to be transported and installed in the correct aligned configuration without requiring the packings themselves to have inherent alignment-stabilizing features.
3Manufacturing precision
If a rigid holder structure is used to maintain packing alignment, then alignment precision is improved, but adaptability to dimensional variations worsens
Solution Approach 1:
The packing holder transitions from a rigid structure to a dynamically adaptable one through its flexible fingers. During insertion, the fingers can deflect and adapt to dimensional variations in the cylinder bore. Once inserted and the packing stack is in place, the fingers maintain sufficient rigidity to ensure precise coaxial alignment. This dynamic behavior resolves the contradiction between alignment precision and adaptability.
Solution Approach 2:
The fingers of the packing holder are designed as flexible elements that can bend and adapt to dimensional variations during insertion. This flexibility allows the holder to accommodate different cylinder bore dimensions and tolerances while still maintaining precise coaxial alignment of the packing stack during the critical insertion phase, thereby resolving the contradiction between rigidity for precision and flexibility for adaptability.
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
Facilitates easy and accurate alignment and installation of packing stacks within the pump cylinder, preventing leakage and ensuring proper sealing, even for complex fluid applications, by maintaining coaxial alignment and secure retention during the installation process.
Implementation Method 1
The plurality of fingers are configured to flex to reduce a cross-sectional area defined by distal ends of the plurality of fingers in response to the packing stack passing over the distal ends of the plurality of fingers
Data Source
AI summary
A packing insertion tool for inserting a packing stack into a cylinder of a piston pump includes a packing holder on which the packing stack is mounted. The packing holder includes a body, a handle disposed at a first end of the body, and a plurality of fingers disposed at a second end of the body. The fingers extend axially from the body and the packing stack is mounted on the fingers, between the body and a retaining feature disposed at a distal end of the fingers. The fingers can flex to allow the diameter of the distal end of the fingers to change as the packing stack slides on to and off of the fingers.