Servovalve Spool Internal Filtration and Jet Pipe Nesting
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Solution Overview
Problem
Conventional servovalves, particularly jet pipe servovalves, face challenges in handling large fluid flows while maintaining a compact design, being less vulnerable to contamination and leakage, and requiring effective fluid filtering without additional complex components.
Innovation Solution
Incorporating filter means, such as a perforated sheet or perforated wall sections, directly into the spool of the servovalve to filter fluid entering the interior, eliminating the need for external filters and reducing the number of components, with the spool providing fluid to the jet pipe internally, thus minimizing external connections and leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external filters are added to filter fluid entering the spool, then fluid filtration is improved, but device complexity and assembly size increase
Solution Approach 1:
The filter means is integrated directly into the spool structure, merging the filtration function with the valve body. The spool includes filter means arranged to filter fluid entering the interior of the spool through openings in the spool, eliminating the need for separate external filter components and reducing assembly complexity.
2Reliability
If external supply pipes are used to provide fluid to the jet pipe, then fluid supply is achieved, but vulnerability to damage and external leakage increases
Solution Approach 1:
The jet pipe is positioned to extend into the interior of the spool, and fluid is provided to the jet pipe from the interior of the spool. This nested arrangement protects the fluid supply pathway within the protected spool interior, eliminating vulnerable external supply pipes while maintaining reliable fluid delivery to the jet pipe.
3Quantity of substance
If larger valve orifice areas are used to handle large flows, then fluid flow capacity is improved, but valve size increases
Solution Approach 1:
The invention utilizes a jet pipe system where fluid transitions from pressure-driven flow through the spool to a directed jet stream from the nozzle. This phase transition in flow pattern allows efficient handling of large fluid flows through a compact nozzle-orifice arrangement rather than requiring large valve orifices, maintaining compact valve size while achieving high flow capacity.
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 solution enables efficient handling of large fluid flows in a compact design with reduced vulnerability to contamination and leakage, while providing reliable filtration without increasing the assembly's size or weight, and simplifying the manufacturing process by reducing the number of parts and eliminating the need for external filters.
Implementation Method 1
the one or more openings comprises filter means for filtering the fluid entering the interior of the spool
Data Source
AI summary
A servovalve includes a fluid transfer valve assembly comprising a supply port and a control port and a moveable valve spool arranged to regulate flow of fluid from the supply port to the control port in response to a control signal. The servovalve also includes a jet pipe assembly configured to direct fluid to the ends of the spool to axially move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow. The jet pipe assembly comprises a jet pipe a connector header fluidly connecting the jet pipe to a nozzle. The spool has one or more openings 28 is provided in the spool such that fluid from the supply port flows into the interior of the spool and into the jet pipe.