7-Shaped Seal Ring With Dirt Lip for Contamination Blocking
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Solution Overview
Problem
Existing sealing rings lack protection against contamination, which can reduce the service life and performance of the sealing lip, leading to potential damage and increased friction losses.
Innovation Solution
A 7-shaped sealing ring design featuring a dirt lip with a radially inner first boundary surface and a radially outer second boundary surface, where the first length is greater than the third length, and a second joint linking the sealing leg and dirt lip, allowing the dirt lip to follow the sealing leg's radial movements and prevent contamination from reaching the sealing lip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing ring with sealing lip is used, then sealing function is achieved, but the sealing lip is exposed to contaminants that reduce service life
Solution Approach 1:
A dirt lip is introduced as an intermediary element between the contaminants and the sealing lip. The dirt lip has a sealing edge that contacts the machine element and creates a barrier, preventing contaminants from reaching the sealing lip while allowing the sealing lip to maintain its sealing function
Solution Approach 2:
The sealing ring is segmented into functionally distinct parts: a sealing leg with sealing lip for sealing, and a dirt lip for contamination protection. This segmentation allows each part to be optimized for its specific function, with the dirt lip serving as a protective barrier
2Reliability
If sealing lip is made longer and more flexible, then sealing contact is improved, but friction losses increase
Solution Approach 1:
Different parts of the sealing ring have different lengths and flexibility characteristics optimized for their specific functions. The sealing lip is longer and more flexible for consistent sealing contact, while the dirt lip is shorter and stiffer to minimize friction and prevent contamination
3Object-affected harmful factors
If dirt lip sealing edge diameter is increased, then contamination protection is improved, but assembly precision requirements increase
Solution Approach 1:
The dirt lip and sealing lip have different diameters, with the dirt lip having a larger sealing edge diameter than the sealing lip diameter. This asymmetric design allows the dirt lip to effectively block contaminants while the sealing lip maintains proper sealing contact, with each element optimized for its specific function
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 effectively protects the sealing lip from contamination, maintaining consistent performance and reducing friction losses, while allowing for flexible operation in various environments and applications with minimal assembly risks.
Implementation Method 1
the dirt lip is designed to prevent contaminants from the area surrounding the sealing ring from adversely penetrating to the sealing lip
Implementation Method 2
the sealing lip maintains a consistent radial preload on the sealing surface of the machine element throughout its service life
Implementation Method 3
The clamping element is ring-shaped and, in cross-section, formed by a figure-eight-shaped spring
Data Source
Figure 1
AI summary
A sealing ring, which in cross-section is 7-shaped, comprising a first axial leg (1) and a sealing leg (2) with a sealing lip (3), wherein the sealing leg (2) is connected to a first end face (5) of the first axial leg (1) by means of a first joint (4). The sealing leg (2) has on its side axially facing the first end face (5) a dirt lip (6) with at least one sealing edge (7) and a radially inner first boundary surface (8) and a radially outer second boundary surface (9).