Integrated Servo Valve Geometry for Precise Flow Control
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Solution Overview
Problem
Existing servo valves in aerospace applications face challenges in precise control of fluid flow due to complex constructions and calibration requirements, which can lead to inefficiencies and increased contamination risks.
Innovation Solution
A servo valve design featuring a valve housing with a longitudinally movable member having cylindrical and frusto-conical sections, a solenoid for actuation, and a spring assembly for reactive force management, which controls fluid flow through annular channels and ports with O-ring seals and screen filters, simplifying construction and reducing calibration needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex construction with multiple components is used to achieve precise fluid flow control, then control precision is improved, but device complexity and calibration requirements increase
Solution Approach 1:
The patent combines multiple functional components (spool, flapper, nozzles, and valve body) into a single integrated unit with a unified body structure. The spool and flapper are formed as integral parts of the valve body, eliminating the need for separate components and complex assembly, thereby reducing device complexity while maintaining precise fluid flow control through the integrated design
2Reliability
If traditional servo valve construction is used, then fluid flow control is achieved, but contamination risks increase due to complex construction and calibration requirements
Solution Approach 1:
The integrated unit design eliminates multiple interfaces and assembly points between separate components, thereby reducing potential sources of contamination. The unified structure with integral spool and flapper formations minimizes gaps and crevices where contaminants could accumulate, improving reliability by reducing contamination risks
3Ease of operation
If multiple separate components are used in servo valve construction, then functional control is achieved, but manufacturing and assembly complexity increase
Solution Approach 1:
The patent forms the spool, flapper, and valve body as a single integrated unit, significantly simplifying manufacturing processes. Instead of manufacturing multiple separate components requiring precise assembly and alignment, the integrated design allows for simpler production methods and reduced assembly steps, thereby improving ease of manufacture while maintaining full operational 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
This design enables precise and efficient control of fluid flow with reduced calibration requirements and improved sealing, minimizing contamination and air gaps, while maintaining a simplified and robust construction.
Implementation Method 1
the member comprises a further portion extending axially into the central opening, wherein the further portion comprises a ferromagnetic material such that actuation of the solenoid is configured to cause an axial movement of the member
Implementation Method 2
in a first axial position of the member the second nozzle opening is at least substantially obstructed by the second frusto-conical surface and the first nozzle opening is at least substantially unobstructed by the first frusto-conical surface, and in a second axial position of the member the first nozzle opening is at least substantially obstructed by the first frusto-conical surface and the second nozzle opening is at least substantially unobstructed by the second frusto-conical surface
Data Source
AI summary
A servo valve comprises a valve housing, a cavity formed in the valve housing and defining a longitudinal axis (X), and a member disposed in the cavity and axially-moveable therein, wherein the member comprises a portion with first and second cylindrical sections having a first diameter (R1, R2), a central section located between the first and second cylindrical sections and having a second diameter (R3), and first and second frusto-conical sections connecting the first and second sections to the central section and forming respective first and second frusto-conical surfaces. A plurality of ports, each form a fluid passage through the valve housing and have first and second nozzles with first and second nozzle openings.