Mechanical Seal Retaining Rib for Stable Low-Leakage Sealing
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Solution Overview
Problem
Existing mechanical seal assemblies struggle to provide a reliable, leak-free seal across various operating conditions, particularly in applications involving toxic media, while maintaining simplicity and cost-effectiveness.
Innovation Solution
A mechanical seal arrangement featuring a retaining component with an annular rib and grooves on the rear side of the sliding rings, which provides support and flexibility to compensate for disruptive forces due to temperature changes and pressure fluctuations, ensuring minimal leakage and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional retaining component without an annular rib is used, then the structure is simple, but the sealing performance deteriorates due to increased leakage under temperature and pressure variations
Solution Approach 1:
The annular rib is pre-formed on the retaining component to provide preliminary support to the sliding ring's rear surface. This pre-positioned support structure compensates for disruptive forces before they fully manifest during operation, maintaining sealing performance without requiring complex active compensation mechanisms.
Solution Approach 2:
The annular rib modifies the geometric parameters of the retaining component by adding a localized protrusion with specific height and radial extent. This parameter change creates a support surface that flexibly accommodates thermal expansion and pressure-induced deformations, improving sealing reliability while keeping the overall structure relatively simple.
2Reliability
If the sliding ring is rigidly fixed to the retaining component, then structural stability is improved, but leakage increases due to transmitted disturbance forces affecting the sealing gap
Solution Approach 1:
Instead of uniformly rigidly fixing the sliding ring, the annular rib provides localized support only at the rear surface contact area. This local quality approach allows the sliding ring to remain relatively free to accommodate sealing requirements while receiving necessary support to reduce disturbance force transmission, thereby improving leakage stability.
Solution Approach 2:
The annular rib acts as a cushioning element that absorbs and distributes disruptive forces before they can be fully transmitted to the sliding ring's sealing surface. This beforehand cushioning effect protects the sealing gap from excessive disturbance forces, maintaining stable sealing performance under varying operating conditions.
3Adaptability or versatility
If the annular rib projects significantly beyond the base surface, then support flexibility is improved, but mechanical strength of the retaining component deteriorates
Solution Approach 1:
Rather than making the annular rib excessively tall to maximize flexibility, a moderate projection height is chosen that provides sufficient support flexibility while avoiding excessive material removal that would compromise the retaining component's overall strength. This partial action approach achieves the necessary adaptability without over-engineering the feature.
Solution Approach 2:
The annular rib functions as a flexible support element with controlled thickness, allowing it to deflect and accommodate thermal and pressure-induced deformations. The rib's geometry is designed to provide flexibility where needed at the contact surface while maintaining adequate cross-sectional area to preserve the retaining component's overall mechanical strength.
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 design significantly reduces leakage and enhances leakage stability by compensating for disruptive forces, particularly under temperature and pressure variations, while maintaining mechanical integrity and cost-effectiveness.
Implementation Method 1
The annular rib enables flexible contact between the retaining component and the back of the sliding ring. This allows for the compensation of disruptive forces that can occur during operation of the sliding ring due to temperature changes, especially temperature fluctuations to high temperatures
Data Source
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AI summary
The invention relates to a mechanical seal assembly comprising: a mechanical seal (2) having a rotating seal ring (3) and a stationary seal ring (4) which define a sealing gap (5) between their seal surfaces (3a), (4a); a retaining component (6), (7) which is located on a rear side (3b), (4b) of one of the seal rings (3, 4), the retaining component (6), (7) having a base surface (60), (70) directed towards the rear side (3b), (4b) of the seal ring (2), (4), the base surface (60), (70) comprising, in the axial direction of the mechanical seal, a projecting web (10), a first annular groove (8), and a second annular groove (9), the first annular groove (8), the second annular groove (9) and the annular web (10) being arranged concentrically to one another and the annular web (10) projecting by a length s beyond the base surface (60), (70) of the retaining component (6), (7), the annular web (10) being in contact with the rear side (3b), (4b) of the seal ring (3), (4) in order to provide support on the rear side of the seal ring, the annular web (10) being located between the first annular groove (8) and the second annular groove (9), and the first annular groove (8) and the second annular groove (9) being arranged immediately adjacent to the annular web.