Sealing Device Lip Packing Pressure Relief Mechanism
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Solution Overview
Problem
Conventional sealing devices in pump devices experience pressure accumulation issues, leading to reduced sealing performance and limited operational frequency, especially in vehicular brake applications, where the existing solutions either fail to effectively relieve pressure or result in environmental pollution.
Innovation Solution
A sealing device featuring a lip packing back ring with an annular protrusion and flow path design, allowing for efficient pressure relief by directing accumulated pressure away from the seal ring, while maintaining a secure pressing load and preventing fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump device operates at high frequency, then productivity increases, but pressure accumulation occurs in the intermediate chamber reducing sealing performance
Solution Approach 1:
The back ring is segmented into multiple functional zones: a sealing surface for sealing, a pressure receiving surface for detecting pressure accumulation, and a flow path for pressure relief. This segmentation allows the single back ring component to simultaneously perform sealing and pressure relief functions, enabling high-frequency operation without pressure accumulation
Solution Approach 2:
The back ring is designed with dynamic pressure relief capability where the flow path allows accumulated pressure to be dynamically discharged to the sealed fluid side when pressure exceeds a certain level. This dynamic response enables the system to maintain sealing performance during high-frequency operation by automatically relieving pressure buildup
2Device complexity
If a conventional O-ring back ring is used, then the structure is simple, but it cannot relieve accumulated pressure effectively
Solution Approach 1:
The back ring is designed as a multi-functional component that simultaneously performs sealing (through the sealing surface), pressure detection (through the pressure receiving surface), and pressure relief (through the flow path). This eliminates the need for separate pressure relief mechanisms while maintaining structural simplicity
Solution Approach 2:
The back ring automatically detects pressure accumulation through its pressure receiving surface and self-regulates by opening the flow path to discharge pressure when needed. This self-service mechanism eliminates the need for external control systems or additional components, maintaining simplicity while providing effective pressure relief
3Reliability
If pressure relief is applied to the atmospheric air side seal member, then pressure accumulation is relieved, but fluid leaks to the external environment causing pollution
Solution Approach 1:
The pressure relief function is extracted from the atmospheric air side seal member and relocated to the back ring on the sealed fluid side. The flow path in the back ring discharges pressure directly to the sealed fluid side, preventing fluid from reaching the atmospheric air side seal member and eliminating the source of potential leakage and pollution
Solution Approach 2:
The back ring acts as an intermediary component that intercepts and relieves pressure accumulation before it can affect the atmospheric air side seal member. By positioning the pressure relief flow path on the sealed fluid side, the back ring mediates between the intermediate chamber and the external environment, preventing harmful fluid discharge
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 sealing device effectively reduces pressure accumulation, enhances sealing performance, and increases operational frequency by smoothly releasing pressure, thereby preventing fluid leakage and maintaining excellent sealing capabilities.
Implementation Method 1
said outer lip is capable of releasing an accumulated pressure by being pushed by a pressure so as to be spaced from said cylinder in a state in which said accumulated pressure is generated in the another space and applied on a back surface side of said outer lip
Data Source
Figure 1~2
Figure 3A~4B
Figure 5A~5B
AI summary
The objective is to provide a sealing device provided with an accumulated pressure relief function. In order to achieve the objective, a seal ring is combined with a back ring, and the back ring is comprised of a lip packing wherein one end of an annular base portion in the axial direction is provided with an inner lip and an outer lip, and the outer peripheral surface of the annular base portion is provided with an annular protrusion for setting a margin for the compression of the back ring in the radial direction. The outer lip is brought into close contact with a cylinder to seal fluid to be sealed, and is pushed by pressure accumulated in a space on the other end in the axial direction so that the outer lip is spaced from the cylinder to relieve the accumulated pressure. The annular protrusion is provided with a passage through which the accumulated pressure is introduced to the outer lip.