Drain Pipe on Shaft Surface for Hydraulic Sealing Pressure Isolation
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Solution Overview
Problem
Hydraulic devices, such as motors and brakes, face challenges in maintaining effective sealing and managing pressure peaks, leading to fluid accumulation and leakage due to the inability of existing dynamic sealing systems to withstand high pressures and deformations, especially in systems with tight component stacking and non-zero casing pressures.
Innovation Solution
A system featuring a shaft with a discharge chamber connected to a drain via a pipe on its surface, allowing fluid from the chamber to be discharged without being subjected to the casing pressure, thereby isolating the dynamic sealing means from pressure peaks and facilitating fluid evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reinforced dynamic sealing means are used to resist high pressure peaks, then sealing reliability is improved, but fluid accumulation occurs in the discharge chamber due to leakage
Solution Approach 1:
The patent extracts the fluid discharge function from the sealed chamber by introducing a separate drain pipe that connects the discharge chamber to the environment. This allows the reinforced dynamic sealing means to maintain high-pressure sealing reliability while the extracted fluid accumulation problem is solved through the dedicated drainage path, preventing fluid buildup in the discharge chamber.
2Quantity of substance
If a drain pipe is introduced to discharge accumulated fluid, then fluid accumulation is reduced, but device complexity increases due to additional components
Solution Approach 1:
The patent merges the drain pipe with the existing shaft structure, integrating the drainage function into the shaft rather than adding a completely separate component. The pipe is arranged on the surface of the shaft and connects to the discharge chamber, combining the structural support function of the shaft with the fluid discharge function, thereby reducing overall device complexity while still effectively managing fluid accumulation.
3Reliability
If the discharge chamber is isolated from casing pressure, then sealing means are protected from high pressure, but the ability to support pressure peaks is reduced
Solution Approach 1:
The patent segments the pressure environment by creating a discharge chamber that is isolated from the main casing pressure through the reinforced dynamic sealing means. The drain pipe provides a separate pressure relief path that allows the discharge chamber to operate at lower pressure while the reinforced sealing means can still support pressure peaks in the main casing, thus protecting the sealing means without completely eliminating pressure support capability.
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 effectively manages pressure peaks and fluid accumulation, protecting the sealing components from high pressures and ensuring reliable operation by providing a controlled drainage mechanism that is independent of the casing pressure, thus enhancing the durability and efficiency of hydraulic devices.
Implementation Method 1
a pipe arranged on the surface of the shaft between the hydraulic device and the shaft so as to discharge the fluid located in the discharge chamber
Data Source
AI summary
The present invention relates to a system comprising: a shaft having a distal end and a proximal end; a casing defining a housing in which a hydraulic device is rotatably mounted on the shaft; and a sealing element comprising a low pressure dynamic sealing means and a reinforced dynamic sealing means formed by a static seal tightly mounted on a friction pad, such as to isolate the dynamic sealing means from the rotating hydraulic device, said sealing element defining a discharge chamber between the dynamic sealing means and the reinforced dynamic sealing means, which discharge chamber is connected to a drain via a pipe arranged on the surface of the shaft, between the hydraulic device and the shaft, so as to discharge the fluid located in the discharge chamber, such that said discharge chamber is not subjected to the pressure in the casing of the hydraulic device.