Spool Servo Valve Geometry for Precise Flow Control and Sealing
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Solution Overview
Problem
Existing servo valves in aerospace applications face challenges in precise control of fluid flow due to complex mechanisms and calibration requirements, leading to potential leakage and inefficiencies.
Innovation Solution
A servo valve design featuring a movable member with distinct cross-sectional areas and flat surfaces within a valve housing, actuated by solenoids and biased by a spring, allowing precise control of fluid flow through multiple ports with reduced calibration needs and enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex mechanism with multiple components is used to control fluid flow, then control precision can be improved, but device complexity and calibration requirements increase
Solution Approach 1:
The patent combines multiple functions (sealing, flow control, obstruction) into a single spool member with varying cross-sectional areas. The spool integrates cavity sealing sections, nozzle obstructing sections, and flow control sections that work together through axial movement alone, eliminating the need for separate calibration mechanisms and reducing overall device complexity while maintaining control precision
Solution Approach 2:
The spool member is segmented into distinct functional zones along its length: first and second cavity sealing sections, first and second nozzle obstructing sections, and middle portions with different cross-sectional areas. This segmentation allows each zone to perform its specific function independently through simple axial displacement, achieving precise fluid flow control without complex mechanical linkages
2Reliability
If traditional servo valve design is used, then fluid flow control is achieved, but leakage occurs and sealing efficiency is reduced
Solution Approach 1:
The spool member features locally optimized sealing surfaces at different positions: first and second cavity sealing sections with cross-sectional areas matching the valve housing cavity, and first and second surfaces on nozzle obstructing sections. These localized sealing features ensure tight fits at critical interfaces, preventing fluid leakage while maintaining reliable operation
3Measurement precision
If multiple adjustment mechanisms are added to improve control precision, then fluid flow accuracy improves, but ease of operation and maintenance difficulty decrease
Solution Approach 1:
The spool member's geometry is designed to automatically establish proper sealing and flow control relationships through its varying cross-sectional areas. The first and second cavity sealing sections self-align with the valve housing cavity, and the nozzle obstructing sections automatically position themselves to control fluid flow to the spool, eliminating the need for manual calibration adjustments and simplifying operation
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 enables precise and efficient control of fluid flow with reduced leakage and simplified construction, providing redundancy and improved sealing, thus enhancing the reliability and efficiency of fluid management in aerospace applications.
Implementation Method 1
a spring operatively connected with the member and configured to bias the member towards a neutral axial position
Implementation Method 2
Each at least one actuator may be a solenoid
Data Source
AI summary
A servo valve includes a valve housing, a cavity formed in the valve housing defining an axis (X) and an axially moveable member disposed in the cavity. The member comprises flat surfaces parallel to the axis (X). A channel is formed within the cavity and a plurality of ports each forming a fluid passage through the valve housing in fluid communication with a spool and with the channel. The plurality of ports include first and second nozzles with nozzle openings, wherein in a first axial position of the member the first nozzle opening is at least substantially obstructed by the first flat surface, and in a second axial position of the member the second nozzle opening is at least substantially obstructed by the second surface, the member controlling fluid between the spool and the channel.