Rotary Shaft Seal Lip Pressing Ring for Low-Temperature Tracking
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Solution Overview
Problem
Conventional sealing apparatuses experience a decrease in rotary shaft tracking due to the brittleness of the seal lip at low temperatures, leading to potential leaks as the tension force from the garter spring weakens.
Innovation Solution
A sealing apparatus with an annular reinforcing ring, an elastic-body portion with a seal lip, an annular garter spring, and a lip-pressing ring, where the seal lip is inserted into the lip-pressing ring, and the inner diameter of the lip-pressing ring is set to be larger than the outer diameter of the seal lip, ensuring contact and maintaining the seal even when the seal lip becomes brittle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a garter spring is used to press the seal lip to the rotary shaft, then tracking of the rotary shaft is improved, but in low-temperature environments the seal lip becomes brittle and the tension force decreases, causing tracking to deteriorate
Solution Approach 1:
The sealing apparatus is divided into distinct functional components: the seal lip (21) for sealing, the garter spring (30) for providing tension force, and the lip-pressing ring (40) for additional pressing force. This segmentation allows each component to address specific aspects of the tracking problem, with the lip-pressing ring compensating for the seal lip's reduced performance at low temperatures
Solution Approach 2:
The sealing apparatus uses composite construction with the seal lip made of elastic body material and the lip-pressing ring made of a different material that can provide consistent pressing force. This composite approach allows combining the flexibility of the elastic seal lip with the structural stability of the lip-pressing ring, ensuring reliable tracking across a wide temperature range
2Adaptability or versatility
If the seal lip is made of elastic body to provide sealing, then sealing flexibility is improved, but at low temperatures the elastic body becomes brittle and tension force decreases
Solution Approach 1:
The lip-pressing ring acts as an intermediary component between the seal lip and the rotary shaft. It provides additional pressing force that compensates for the reduced tension force of the elastic seal lip at low temperatures. The lip-pressing ring mediates the interaction, ensuring consistent contact pressure between the seal lip and rotary shaft even when the elastic body becomes brittle
Solution Approach 2:
The invention changes the physical parameters of the sealing system by introducing the lip-pressing ring with a specific inner diameter that is larger than the outer diameter of the seal lip. This dimensional parameter change allows the lip-pressing ring to contact and press the seal lip, creating a new force parameter that compensates for the temperature-dependent degradation of the elastic body's tension force
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
This configuration effectively suppresses the decrease in rotary shaft tracking, maintaining the seal's performance even in low-temperature environments by providing additional contact and tension to the seal lip.
Implementation Method 1
an annular garter spring; and a lip-pressing ring that is an annular member; wherein the garter spring is embedded in the receiving groove of the seal lip
Implementation Method 2
the garter spring, in a usage state of the sealing apparatus 100, presses the lip tip portion 105 to the rotary shaft and imparts to the lip tip portion 105 a tension force against the rotary shaft
Implementation Method 3
the lip-pressing ring is configured so the seal lip can be inserted into a space on the inner-periphery side of the lip-pressing ring, a value of an inner diameter of the lip-pressing ring being no less than a value of an outer diameter of an annular portion that is at least a portion on the outer-periphery side of the seal lip
Data Source
AI summary
A sealing apparatus 1 is provided with a reinforcing ring 10 that is a member that is annular around an axis x, an elastic-body portion 20 that is formed from an elastic body that is annular around the axis x, an annular garter spring 30, and a lip-pressing ring 40 that is an annular member. The lip-pressing ring 40 is configured so that a seal lip 21 can be inserted into a space on an inner-periphery side thereof, and a value of an inner diameter thereof is configured to be a size no less than a value of an outer diameter of an annular portion that is at least a portion on an outer-periphery side of the seal lip 21. The sealing apparatus can suppress a decrease in tracking a rotary shaft.