Hydraulic Spool Valve Web Layout for Annular Flow Suppression
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Solution Overview
Problem
Hydraulic spool valves experience increased wear and leakage due to annular flows and rotational movements of the control piston, leading to high flow resistance and wear issues.
Innovation Solution
The design incorporates a radial web in each control chamber, with the second web being longer in the peripheral direction than the first, preventing annular flows and ring vortex formation, and the webs are positioned to counteract rotational movements, reducing flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a radial web is provided in control chambers to prevent annular flow, then flow losses are reduced, but flow resistance increases due to the web obstructing the flow path
Solution Approach 1:
The patent applies different web lengths in different control chambers based on local flow conditions. The first web (in the first control chamber) has a first length, while the second web (in the second control chamber) has a second length that is longer than the first length. This local differentiation optimizes the balance between preventing annular flow and minimizing flow resistance in each specific chamber configuration.
Solution Approach 2:
The patent introduces asymmetry by making the webs of different lengths in the two control chambers. The second web extends further radially than the first web, creating an asymmetric configuration that specifically addresses the flow patterns in each chamber while maintaining overall system performance.
2Loss of energy
If the second web is made longer than the first web, then annular flows are prevented more effectively, but device complexity increases due to asymmetric web configuration
Solution Approach 1:
The asymmetric web configuration applies local quality by tailoring the web length to the specific requirements of each control chamber. The first web and second web have different lengths optimized for their respective chambers' flow characteristics, achieving effective annular flow prevention without requiring complete symmetry throughout the entire device.
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 minimizes flow losses and wear by preventing annular flows and rotational movements, thereby reducing flow resistance and enhancing the operational efficiency of the hydraulic spool valve.
Implementation Method 1
A rotational movement of this type would entail increased wear on control pistons and bodies and increased leakage. The flow losses caused by an annular flow per se are not considered in greater detail in DE 36 44 269.
Data Source
AI summary
A hydraulic spool valve includes a valve housing which has a valve bore having two control chambers, which directly follow one after the other axially at a distance and extend beyond the diameter of the valve bore. A connection surface of the valve housing has a pump connection opening connected by a first fluid channel to a first of the two control chambers. A consumer connection opening is connected by means of a second fluid channel to a second of the two control chambers. The valve has a control piston, which is guided back and forth in the valve bore to fluidically connect or separate the two control chambers. A radial web of the valve housing projects into each control chamber, with an extension delimited in the circumferential direction. The web in the second control chamber is longer in the circumferential direction than the web in the first control chamber.