Pressure-Compensated Control Spool for Fast Hydraulic Switching
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Solution Overview
Problem
Existing fluid control devices for variable hydraulic pumps are prone to dependency on fluid flow forces, exhibit slow response times, and suffer from leakage issues, limiting their effectiveness in controlling hydraulic pumps with varying fluid flow demands.
Innovation Solution
A fluid control device design featuring a control spool with strategically positioned control surfaces and fluid conduits that are pressure compensated and pressure dependent, allowing for improved independence from flow forces, reduced fluid resistance, and enhanced switching behavior, incorporating a fluid flow boosting device and actuator mechanisms for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional fluid control spool design is used, then the device structure is simple, but the control device shows dependency on fluid flow forces and has slow response times
Solution Approach 1:
The control spool is divided into multiple segments or zones with different control surfaces positioned at specific locations. This segmentation allows independent control of different fluid pathways, enabling faster response times by reducing the mass that needs to be accelerated while maintaining structural integrity through strategic positioning of control surfaces.
Solution Approach 2:
Control surfaces are positioned not only axially but also radially at specific distances from the spool axis. This multi-dimensional arrangement of control surfaces creates pressure-dependent control zones that accelerate fluid flow and reduce dependency on flow forces, thereby improving response time without proportionally increasing structural complexity.
2Reliability
If control surfaces are positioned away from the spool axis, then independence from flow forces improves, but manufacturing complexity increases
Solution Approach 1:
Control surfaces are positioned at specific radial distances from the spool axis rather than uniformly distributed. This local quality approach places control surfaces only where needed to create pressure-dependent control zones, improving independence from flow forces while minimizing manufacturing complexity by avoiding unnecessary structural modifications throughout the entire spool.
Solution Approach 2:
The control surfaces act as intermediaries between the actuating force and the fluid flow. By positioning them at optimal radial distances, they mediate the control action to create pressure-dependent zones that reduce flow force dependency, achieving improved reliability through a relatively simple manufacturing process.
3Stability of the object's composition
If the control spool mass is increased for stability, then oscillation dampening improves, but response time decreases
Solution Approach 1:
The control spool structure is segmented with control surfaces positioned at specific locations rather than requiring uniform mass distribution. This allows the spool to have sufficient mass for stability in certain regions while maintaining lower mass in regions that require rapid acceleration, achieving both oscillation dampening and fast response times.
Solution Approach 2:
The positioning parameters of control surfaces are optimized to create pressure-dependent control zones that provide inherent damping effects. By changing the spatial parameters of control surface positions rather than uniformly increasing mass, the system achieves stability with minimal mass, thereby maintaining fast response times.
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 significantly reduces dependency on flow forces, enhances response times, and minimizes leakage, resulting in improved control performance and independence from fluid flow demands, making it suitable for variable hydraulic pumps with varying fluid flow requirements.
Implementation Method 1
a control spool (15) that is arranged movably inside the fluid transfer chamber (17) in a way that a first fluid conduit (13) and a third fluid conduit (14) can be selectively fluidly connected to a second fluid conduit (11) through the fluid transfer chamber (17)
Data Source
AI summary
The invention relates to a fluid control device (7, 30) that comprises a fluid transfer chamber (17) and a first fluid conduit (13), a second fluid conduit (11) and a third fluid conduit (14) which are fluidly connected to the fluid transfer chamber (17). A control spool (15) is arranged movably inside the fluid transfer chamber (17) in a way that the first fluid conduit (13) and the third fluid conduit (14) can be selectively fluidly connected to the second fluid conduit (11) through said fluid transfer chamber (17). The control surfaces (19, 20) of the control spool (15) are arranged in the vicinity of the first fluid conduit (13) the third fluid conduit (14).