Bi-Directional Packing Seal Assembly for Balanced Compression
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Solution Overview
Problem
Conventional fluid regulating devices experience uneven distribution of compressive forces on packing elements due to unidirectional compression, leading to premature wear and localized frictional heat generation, necessitating frequent manual adjustments.
Innovation Solution
A mechanical packing sealing assembly that applies bi-directional compressive forces through a pressure adjustment element and gland element, balancing the axial and radial stress ratio, eliminating the need for manual adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unidirectional compression is applied to the packing assembly, then the packing elements are compressed axially to form a seal, but the compressive forces are unevenly distributed leading to premature wear and localized frictional heat generation
Solution Approach 1:
The patent introduces a pressure adjustment element with a piston area that applies a counteracting force to balance the compressive forces on the packing assembly. The piston area is sized to convert process fluid pressure into an axial force that opposes the gland element's compression, creating a balanced force distribution that prevents premature wear and heat generation.
Solution Approach 2:
The patent modifies the compression mechanism by adding a pressure adjustment element that dynamically balances the axial forces on the packing assembly. The piston area parameter is specifically designed to convert process pressure into a balancing force, changing the force distribution parameter from uneven to balanced across the packing elements.
2Reliability
If manual adjustments are made to the compression forces, then the sealing performance can be maintained, but frequent adjustments are required due to uneven force distribution
Solution Approach 1:
The patent implements a self-regulating mechanism where the pressure adjustment element automatically balances the compressive forces on the packing assembly by converting process fluid pressure into a counteracting axial force. This self-balancing action eliminates the need for frequent manual adjustments, allowing the system to maintain optimal sealing performance autonomously.
Solution Approach 2:
The pressure adjustment element acts as a feedback mechanism that responds to process fluid pressure changes by automatically adjusting the force balance on the packing assembly. The piston area translates pressure variations into corresponding force adjustments, creating a closed-loop system that maintains balanced compression without manual intervention.
3Reliability
If a piston area is added to convert process pressure into axial force, then the compressive forces are balanced, but the device complexity increases
Solution Approach 1:
The pressure adjustment element serves multiple functions: it converts process fluid pressure into axial force, balances the compressive forces on the packing assembly, and eliminates the need for manual adjustment mechanisms. By combining these functions into a single element, the patent achieves force balance without proportionally increasing device complexity.
Solution Approach 2:
The patent utilizes the existing process fluid pressure (pneumatic or hydraulic energy) to generate the balancing force through the piston area. This approach leverages the available process energy rather than requiring an additional power source or complex mechanical adjustment system, thereby achieving force balance with minimal added complexity.
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
Uniform distribution of compressive forces reduces wear and friction, enhancing the sealing performance and reducing the frequency of manual adjustments, thus improving the longevity and efficiency of the sealing system.
Implementation Method 1
The piston area is sized and configured for converting 100% or more of the pressure of the process fluid into the axial force applied to the packing assembly
Implementation Method 2
As the packing assembly is compressed, the packing elements expand radially to create a suitable fluid seal between the shaft and the stationary equipment housing
Implementation Method 3
The gland element can apply a compression or compressive force to the packing assembly by compressing the packing elements both axially and radially so as to ensure scaling contact between the packing assembly and the shaft
Data Source
AI summary
A mechanical packing sealing assembly having an axially movable pressure adjustment element for applying a pressure to a packing assembly, a packing pressure adjustment element for selectively axially moving the pressure adjustment element, and position locking element for defining an axially outboard most position of the pressure adjustment element. The mechanical packing sealing assembly can also include a plurality of packing elements forming a packing assembly that are sized and configured for seating within a recess of stationary equipment and about the pressure adjustment element.