Mechanical Seal Assembly with One-Piece Safety Seal Backup
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Solution Overview
Problem
Mechanical seals are expensive to manufacture, and existing redundant seal systems that use a second mechanical seal as a safety measure are costly and inefficient, especially in hazardous applications where environmental protection is critical.
Innovation Solution
A mechanical seal assembly that incorporates a one-piece, flexible safety seal with a sealing area integral to the main body, which can be made from cost-effective fiber-reinforced thermoplastic materials, providing a redundant seal without the need for a second mechanical seal. This safety seal is designed to be stationary, with features like an arc-shaped transition and radially projecting lips to minimize friction and ensure sealing in case of mechanical seal failure, while also allowing for efficient heat dissipation through recesses in the rotating component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second mechanical seal is used as a safety seal, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the expensive mechanical seal safety seal with a simple, inexpensive elastomeric seal that can be easily replaced. The elastomeric seal is designed as a simple O-ring or similar configuration that provides adequate safety sealing at a fraction of the cost of a mechanical seal, accepting that it may need more frequent replacement but achieving significant cost savings.
Solution Approach 2:
The patent changes the fundamental parameters of the safety seal from a complex mechanical seal design to a simple elastomeric material-based seal. This parameter change involves transitioning from rigid mechanical components with moving parts to a flexible, deformable material that achieves sealing through elastic deformation and pressure, thereby reducing manufacturing complexity and cost.
2Reliability
If a safety seal is added to the mechanical seal assembly, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the safety seal function directly into the existing mechanical seal assembly structure. The elastomeric safety seal is positioned to work in conjunction with the mechanical seal components already present, utilizing the same mounting spaces and sealing surfaces, thereby adding redundancy without requiring a separate, independent safety seal system.
Solution Approach 2:
The patent employs a simple elastomeric seal design that is inherently less complex than a mechanical seal. The elastomeric material provides sealing through its ability to deform and conform to surfaces, eliminating the need for complex mechanical components, springs, or adjustment mechanisms that would increase device complexity.
3Reliability
If a stationary safety seal with sealing area is used, then sealing effectiveness is improved, but friction losses increase
Solution Approach 1:
The patent applies local quality by providing the sealing function only where absolutely necessary. The elastomeric safety seal is positioned to contact the rotating component only at the sealing interface, while the rest of the seal structure remains non-contact. This localized sealing approach minimizes the surface area in frictional contact, reducing energy losses while maintaining effective sealing at the critical interface.
Solution Approach 2:
The patent uses a flexible elastomeric seal that can deform to create sealing contact. The elastomeric material's flexibility allows it to conform to the rotating component's surface irregularities and maintain sealing under varying pressure conditions without requiring continuous mechanical contact, thereby reducing friction compared to rigid mechanical seal configurations.
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 provides a cost-effective and efficient redundant sealing mechanism that minimizes additional losses during normal operation and ensures reliable containment of media in case of mechanical seal failure, reducing the risk of environmental contamination and thermal damage to the safety seal, thus eliminating the need for a second mechanical seal.
Implementation Method 1
the sealing area (31) is formed to be flexible
Implementation Method 2
the material of the safety ring to be fiber-reinforced. It is furthermore preferred for the base material for the safety seal to be a thermoplastic polymer, preferably fiber-reinforced
Data Source
AI summary
The invention relates to a mechanical seal assembly comprising a mechanical seal (2) comprising a rotating mechanical seal (20) and a stationary mechanical seal (21) defining a sealing gap (22) therebetween, and a one-piece safety seal (3) provided as a redundant seal in the event of failure of the mechanical seal (2) and adapted to seal at a rotating component, the safety seal (3) comprising a base body (30) and a sealing area (31) projecting from the base body (30) in the axial direction (X-X) and being flexible, a thickness of the sealing area (31) in the radial direction being smaller than a thickness of the base body (30) in the radial direction, and the safety seal (3) being arranged in a stationary manner and comprising a sealing surface (32) on an inner circumference.