Pressure Regulating Valve Damping Chamber Design
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Solution Overview
Problem
Existing pressure-limiting valves in hydraulic systems, particularly in underground mining, fail to effectively suppress vibrations and ensure safe pressure relief due to their design, leading to inadequate damping and potential harm from oscillations.
Innovation Solution
A pressure relief valve design featuring a three-stage inner bore with a large-volume drain bore, a middle bore with increased diameter, and a short throttle bore, which allows quick hydraulic fluid drainage and damping chamber filling, enabling immediate suppression of vibrations and safe pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a long throttle bore is used to connect the damping chamber to system pressure, then damping effect is improved, but reaction time to vibrations deteriorates
Solution Approach 1:
The inner bore is segmented into three distinct functional sections: a large-volume drain bore for rapid fluid discharge, a middle bore with increased diameter for efficient fluid transfer, and a short throttle bore for controlled damping. This segmentation allows each section to optimize its specific function rather than using a single long throttle bore for all purposes.
Solution Approach 2:
Different sections of the inner bore have different local qualities: the drain bore section has large volume for rapid discharge, the middle bore has increased diameter for efficient transfer, and the throttle bore section has restricted diameter for damping control. This local differentiation resolves the contradiction by providing both rapid response (through large-volume sections) and damping (through the throttle section).
2Object-affected harmful factors
If the throttle bore is made longer to improve damping, then oscillation suppression is improved, but the valve becomes unable to respond to faster vibrations
Solution Approach 1:
The throttling function is separated from the drainage function through segmentation of the inner bore. The short throttle bore provides oscillation suppression while the separate large-volume drain bore handles rapid fluid discharge, enabling the valve to respond to fast vibrations without sacrificing damping capability.
Solution Approach 2:
The middle bore with increased diameter acts as an intermediary between the drain bore and throttle bore, facilitating efficient fluid transfer while allowing the throttle bore to focus specifically on damping without being constrained by the need for long fluid paths.
3Stress or pressure
If radial bores are used for hydraulic fluid discharge, then pressure relief is achieved, but vibration damping is insufficient
Solution Approach 1:
The patent merges the pressure relief function (through radial bores) with the damping function (through the throttle bore connection to damping chamber) into a single integrated inner bore structure. This allows both functions to operate simultaneously through different sections of the same bore, achieving both pressure relief and vibration damping.
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 ensures rapid and complete suppression of vibrations, ensuring the pressure relief valve remains unaffected and hydraulic fluid is discharged safely, meeting safety requirements and providing effective damping.
Implementation Method 1
a valve spring (3) which acts on a valve spring plate (8) designed in the shape of a hat and holds the latter in a lowered position
Implementation Method 2
the hydraulic fluid, which is under system pressure, not only ensures that the spring plate is lifted and the radial bores are exposed in the event of an overload, but that the damping chamber is also filled at the same time via the throttle bore
Implementation Method 3
the actual throttle bore itself only forms the uppermost part of the entire inner bore, so that system pressure is always present in the damping chamber, but due to the shortness of the throttle bore, there can be a quick reaction to vibrations
Data Source
Figure 1
Figure 2
AI summary
The aim of the invention is to protect hydraulic assemblies, in particular those used for hydraulic longwall working in coal mining. To achieve this, pressure regulating valves (1) are used, the damping chambers of which (20) are located, configured and connected to the inlet side (5) in such a way that a system pressure constantly prevails in said chamber (20) and only drains in a restricted manner when the pressure in the regulating valve (1) is released, thus preventing the occurrence of detrimental vibrations.