Mechanical Seal Stopper Geometry Against Rotary Ring Tilting
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Solution Overview
Problem
Mechanical seals face issues with the rotary ring tilting and gasket slippage due to large fluid pressures, leading to compromised sealing performance.
Innovation Solution
A mechanical seal design featuring a stopper with an annular and inclined part fixed to the sleeve, which restricts the rotary ring's movement and rotation, combined with a gasket that seals the gap between the rotary ring and sleeve, preventing excessive force contact and gasket slippage.
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 counteraction against the fluid pressure that would otherwise cause the rotary ring to tilt. By positioning the stopper in advance, the system prevents the harmful tilting effect before it occurs, maintaining sealing performance even under large fluid pressure conditions
2Reliability
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 large fluid 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 outward slippage. This division of functions allows each component to specialize in its specific task, improving overall positioning reliability without requiring the gasket to perform both functions
3Reliability
If the stopper is press-fitted with respect to the sleeve, then the stopper restricts rotary ring movement, but the press fit load becomes excessively large causing contact with rotary ring
Solution Approach 1:
The stopper features a localized press-fit portion with specific dimensional characteristics (smaller diameter than the sleeve's large-diameter part) that concentrates the press-fit load in a controlled local area. This local quality design ensures adequate movement restriction while preventing excessive load that would cause the stopper to contact the rotary ring
Data Source
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.