Mechanical Seal Assembly for Faster Maintenance on Large Shafts
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Solution Overview
Problem
Mechanical seals for large shafts in power plants are cumbersome due to their multi-part design, leading to increased assembly and disassembly times, resulting in unwanted downtimes during maintenance.
Innovation Solution
A mechanical seal arrangement featuring a one-piece slide ring carrier, a one-piece ring-shaped cover, and a detachable one-piece ring-shaped housing with a fixing device, allowing for easy assembly and disassembly, and utilizing elastic biasing members and O-rings to compensate for shaft impacts and protect sliding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical seals for large shafts are designed with multiple parts to reduce weight and facilitate assembly, then ease of assembly is improved, but assembly and disassembly time increases leading to longer downtimes
Solution Approach 1:
The mechanical seal is divided into modular components: a stationary seal unit that remains installed on the shaft, and a rotating seal unit that can be independently removed and replaced. This segmentation allows the stationary part to stay in place while only the rotating part needs to be accessed and replaced, significantly reducing maintenance time while maintaining ease of assembly through standardized interfaces.
Solution Approach 2:
The mechanical seal incorporates a dynamically adjustable compensation mechanism that automatically adapts to shaft movements and misalignments. This dynamic capability eliminates the need for precise manual alignment during assembly, reducing assembly time and complexity while maintaining sealing effectiveness under varying operating conditions.
2Ease of manufacture
If mechanical seals for large shafts are designed with multiple parts to simplify manufacturing, then ease of manufacture is improved, but device complexity increases leading to more components to manage
Solution Approach 1:
The stationary seal unit integrates multiple functions into a single component: the stationary ring, sealing surface, and mounting structure are combined into one monolithic piece. Similarly, the rotating seal unit merges the rotating ring, spring mechanism, and retaining features into a single replaceable assembly. This merging reduces the total number of discrete components while maintaining manufacturing simplicity through standardized production of these integrated units.
3Reliability
If slide rings are replaced frequently to maintain sealing performance, then reliability is improved, but maintenance frequency increases leading to more downtime
Solution Approach 1:
The mechanical seal incorporates preliminary lubrication and protection features: the sliding surfaces are pre-coated with lubricant, and the rotating seal unit includes built-in protection against contamination. This preliminary preparation extends the service life of the slide rings, reducing the frequency of replacements needed while maintaining reliable sealing performance.
Solution Approach 2:
The mechanical seal includes a spring-loaded compensation mechanism that maintains constant contact pressure between the sliding surfaces, cushioning against sudden loads and misalignments. This beforehand cushioning prevents premature wear and damage to the slide rings, extending their operational life and reducing maintenance frequency while ensuring consistent sealing reliability.
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 rapid and cost-effective maintenance by reducing the number of components to be removed and assembled, minimizing downtime and maintenance costs, while ensuring secure sealing and protection of sliding surfaces.
Implementation Method 1
The slide ring carrier is connected to the cover using at least one elastic biasing member, such that the slide ring carrier may perform movements in the axial direction of the mechanical seal together with the stationary seal ring. In this way, shaft impacts or the like can be compensated by the mechanical seal without causing damage to the sliding surfaces of the slide rings.
Implementation Method 2
The O-rings (21a, 21b, 21c, 21d) are arranged at the clamping areas and provide sealing between the slide rings and their mounting components, preventing fluid leakage while accommodating slight dimensional variations through elastic deformation.
Data Source
AI summary
The invention relates to a mechanical seal arrangement comprising a mechanical seal (10) including a rotating slide ring (2) and a stationary slide ring (3), defining a seal gap (4) therebetween, a one-piece, ring-shaped slide ring carrier (5), which holds the stationary slide ring (3), a one-piece, ring-shaped cover (6), which is arranged on the slide ring carrier (5), a one-piece, ring-shaped housing (7), which is detachably fixed to the cover (6) using fixing device (8), and a one-piece first retaining ring (9), which is detachably arranged on the slide ring carrier (5), wherein the stationary slide ring (3) is clamped between the first retaining ring (9) and the cover (6), and wherein the slide ring carrier (5) is connected to the slide ring carrier (5) by means of at least one elastic biasing member (19) such that the slide ring carrier (5) can perform movements in the axial direction of the mechanical seal arrangement together with the stationary slide ring (3).