Hydraulic Fluid Screen With Tapered Apertures for Low Pressure Loss
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Solution Overview
Problem
Hydraulic fluid screening elements face challenges in being robust, chemically resistant, and able to withstand high pressures while minimizing viscosity-dependent hydraulic resistance, maintaining purity, and preventing contamination, especially in high-pressure applications like control and safety valves.
Innovation Solution
A high-pressure hydraulic fluid screening element with an annular main body and a screening region formed through powder injection molding, featuring apertures that increase in cross-section directionally to reduce viscosity dependence and prevent particle jamming, and a conical design for easy installation and cleaning, produced from sinterable metals like stainless steel alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal gauze or punched filters are used, then they provide basic filtering capability, but they exhibit high viscosity-dependent hydraulic resistance and are prone to particle jamming
Solution Approach 1:
The patent changes the geometric parameters of the filter apertures by implementing a tapered design where the aperture cross-section increases in the direction of fluid flow. This parameter change reduces viscosity-dependent hydraulic resistance and prevents particle jamming while maintaining reliable filtering capability.
Solution Approach 2:
The patent applies different aperture characteristics at different locations: smaller apertures at the inlet side for effective particle filtration, and progressively larger apertures toward the outlet side to reduce hydraulic resistance and prevent jamming. This local variation in aperture quality optimizes both filtering and flow characteristics.
2Reliability
If screens with small passages are used to maintain purity, then they provide good contamination protection, but they increase hydraulic resistance and are more susceptible to clogging
Solution Approach 1:
The tapered aperture design changes the passage parameters along the flow direction, maintaining small effective filtration apertures at the inlet for contamination protection while increasing passage size toward the outlet to maintain fluid flow capability and reduce clogging susceptibility.
3Strength
If robust metal screens are used to withstand high pressure, then they provide structural strength, but they are difficult to clean and install
Solution Approach 1:
The patent employs a conical/tapered geometry for the filter element and apertures, using curved surfaces that facilitate easy installation by allowing the filter to be pressed into place, and enabling simple cleaning by flushing particles out through the tapered passages.
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 provides a robust, chemically resistant, and low-viscosity-dependent screening element that can handle high pressures, preventing contamination and easy installation, with reduced risk of particle detachment and enhanced load-bearing capacity, suitable for high-pressure hydraulic systems.
Implementation Method 1
A screening region covers over the inner cross section of the main body and is formed integrally with the main body by the powder injection-molding process, the screening region being provided with a multiplicity of apertures
Implementation Method 2
the screening element having an annular main body... The screening region covers over the inner cross section of the main body and is formed integrally with the main body by the powder injection-molding process
Data Source
AI summary
The invention relates to a high-pressure hydraulic fluid screening element (1) for inserting into a hydraulic line or into a hydraulic connection of a hydraulic device, having an annular main body (2), which is aligned with respect to its axis of rotation (9) in a longitudinal direction (5). The outside diameter of the main body (2) is greater than its axial length. The inner cross section of the main body (2) is covered over by a screening region (3), which is provided with a multiplicity of apertures (4). In this case, the main body (2) and the screening region (3) are produced integrally by the powder injection-molding process.