Sealing Device Lip Edge Dust Barrier
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Solution Overview
Problem
Existing sealing devices are prone to dust intrusion from the atmospheric side, which can lead to leakage of sealing fluid due to dust being trapped between the seal lip and shaft, compromising the sealing effectiveness.
Innovation Solution
A sealing device with a three-dimensional shape, featuring projections or grooves extending parallel to the lip end, is implemented between screws on the atmospheric side inclined surface, preventing dust intrusion by creating a barrier that dams or accommodates dust, ensuring it does not reach the lip end, while maintaining the pumping action of the screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are provided on the atmospheric side inclined surface to increase pump amount, then sealing performance is improved, but dust intrusion risk increases causing sealing fluid leakage
Solution Approach 1:
The atmospheric side inclined surface is segmented into multiple functional zones: screw portions for pumping action and three-dimensional shape portions (protrusions or grooves) for dust collection. This segmentation allows the sealing lip to simultaneously achieve effective fluid pumping and dust prevention without compromise
Solution Approach 2:
The three-dimensional shapes (protrusions or grooves) serve as intermediary structures between the atmospheric environment and the sealing interface. These intermediaries capture and hold dust particles, preventing them from reaching the lip end and shaft interface where they would cause sealing failure
2Reliability
If the seal lip contacts the shaft to prevent leakage, then sealing effectiveness is improved, but dust becomes trapped between them causing gap formation and leakage
Solution Approach 1:
The three-dimensional shapes are positioned upstream on the atmospheric side inclined surface to preliminarily capture dust particles before they can reach the lip end-shaft interface. This preliminary dust collection action prevents the formation of gaps that would compromise sealing stability
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 three-dimensional shape effectively inhibits dust from entering the lip end, preventing fluid leakage and ensuring the sealing device's functionality by preventing dust from climbing over or passing through the designed barriers, while maintaining the screw's pumping action.
Implementation Method 1
a plurality of screws 15 which exert a pumping action in relation to a sealing fluid are provided circumferentially in an atmospheric side inclined surface 14 of the seal lip 11
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a sealing device capable of inhibiting the external atmospheric dust from intruding in a lip edge and thereby capable of inhibiting sealing fluid leaking by way of trapped dust. In order to achieve this purpose, the sealing device that inhibits sealing fluid inside the device from leaking to the atmosphere, wherein a plurality of screws that are in contact with a shaft at the lip edge of the seal lip and that exert a pumping effect on the sealing fluid are provided in a circular shape on an incline face on the atmosphere-side of a seal lip, is provided with, between the screws, a three-dimensional shape for preventing dust intrusion for inhibiting external atmospheric dust from intruding toward the lip edge. The three-dimensional shape comprises a protrusion or a groove extending in a direction parallel to the lip edge. The lengthwise ends of the protrusion or groove extend to the screws.