Rotary-Spool Hydraulic Valve Flow Control to Reduce Cavitation
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Solution Overview
Problem
Conventional hydraulic control valve units lack the ability to efficiently adjust hydraulic flow and pressure, leading to issues such as cavitation and increased back-pressure, which can stress components and reduce efficiency.
Innovation Solution
A hydraulic control valve unit with a control slide that can be axially and rotationally displaced, featuring control segments with geometrically designed edges and housing segments that allow for varying flow cross-sections, enabling adjustable hydraulic functionality with low technical effort and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control slide is only axially displaceable, then the structure is simple, but the hydraulic functionality is limited
Solution Approach 1:
The control slide is designed with both axial and rotational degrees of freedom, transforming it from a static linear actuator to a dynamic component that can vary flow cross-sections through rotation while maintaining axial positioning capabilities. This enables multiple hydraulic functions from a single component
Solution Approach 2:
The invention adds rotational movement (circumferential dimension) to the traditional axial movement of the control slide. This dimensional expansion allows the control edge to interact with housing segments in new ways, creating variable flow cross-sections and enabling additional hydraulic control functions
2Adaptability or versatility
If multiple axial working positions are used to control different flow rates, then the flow control range is increased, but the axial displacement path increases
Solution Approach 1:
Within a single axial position, the control slide can rotate to dynamically adjust flow cross-sections, eliminating the need for multiple axial positions. This reduces the axial travel required while maintaining comprehensive flow control capability
Solution Approach 2:
The invention changes the control parameter from axial position only to a combination of axial position and rotational angle. This allows flow rate control through rotation at a fixed axial position, reducing the required axial displacement path
3Adaptability or versatility
If the control edge has a fixed geometry, then the manufacturing is simple, but the flow cross-section adjustment capability is limited
Solution Approach 1:
The control edge is designed with asymmetric geometry relative to the rotational axis, allowing different flow cross-sections to be created at different rotational positions. This asymmetric design enables variable flow control while maintaining a relatively simple monolithic structure
Data Source
AI summary
A hydraulic control valve unit includes an input port hydraulically coupled to a pump, a working port hydraulically coupled to the working load, and a return port connected to a hydraulic tank. The unit includes a control slide movable into different working positions in an axial direction for controlling a hydraulic flow between the hydraulic ports and a slide housing surrounding the control slide. The control slide includes a control segment which is delimited in the axial direction by a control edge, and cooperates with an axial housing segment of the slide housing for controlling a flow cross section for hydraulic flow at the control segment. The control slide is rotationally driven about an axis of rotation in a rotational direction. The control edge of the control segment or the housing segment cooperating with the control segment is designed such that the flow cross section has a different size depending on a rotational position of the control slide.