Mechanical Seal Stopper Structure for Rotary Ring Positioning
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Solution Overview
Problem
Conventional mechanical seals face issues with the rotary ring tilting and gasket slippage under high fluid pressure, leading to compromised sealing performance.
Innovation Solution
A mechanical seal design featuring a stopper with an annular and inclined part fixed to the sleeve by welding, which restricts the rotary ring's movement and rotation, combined with a gasket and flange-shaped seal parts to prevent tilting and slippage, ensuring reliable positioning and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the rotary ring is subjected to large fluid pressure toward the fixed ring, then the sealing force is improved, but the rotary ring becomes tilted and sealing performance declines
Solution Approach 1:
The stopper is pre-installed on the sleeve to provide preliminary counter-action against the fluid pressure that would cause the rotary ring to tilt. By positioning the stopper beforehand, it can immediately resist the tilting force when fluid pressure is applied, preventing the harmful effect before it occurs.
Solution Approach 2:
The inclined part of the stopper converts the harmful fluid pressure that causes tilting into a beneficial positioning force. The inclined surface transforms the axial fluid pressure into a radial component that presses the rotary ring against the stopper, ensuring stable positioning while maintaining sealing force.
2Ease of operation
If the gasket is used to position the rotary ring, then the rotary ring is positioned in radial direction, but the gasket may slip out from the sleeve under high pressure
Solution Approach 1:
The positioning function is segmented between two components: the gasket handles radial positioning while the stopper handles axial positioning and prevents slippage. This division of functions allows each component to specialize in its designated role, improving overall reliability without compromising ease of operation.
Solution Approach 2:
The stopper acts as an intermediary component between the sleeve and the rotary ring, providing additional support to prevent the gasket from slipping out. It mediates the high-pressure forces by distributing them through its inclined surface, protecting the gasket from excessive stress.
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
The solution effectively prevents the rotary ring from tilting and gasket slippage, maintaining stable sealing performance even under high fluid pressure by restricting movement and rotation, thus enhancing the mechanical seal's reliability.
Implementation Method 1
the inclined part and the sleeve are fixed to each other by a welded part
Data Source
Figure 1
Figure 2
AI summary
A mechanical seal in which a rotary ring can be more reliably positioned. A rotary ring unit 100 includes: a sleeve 120 fixed to a rotary shaft 500; and a rotary ring 110 of which a movement in an axial direction and a rotation with respect to the sleeve 120 is restricted, a fixed ring unit 200 includes: a fixed ring 210 configured to slide on an end surface of the rotary ring 110; and a bellows 250 which presses the fixed ring 210 toward the rotary ring 110, and the sleeve 120 is provided with a stopper 140 which restricts a movement of the rotary ring 110 toward the fixed ring 210.