Rotatable Hydraulic Control Slide for Cavitation-Resistant Flow Control
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Solution Overview
Problem
Conventional hydraulic control valve units lack the ability to efficiently adjust hydraulic flow cross sections and manage back-pressure, leading to potential cavitation and stress on components.
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 functionalities with low technical effort and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional control slide with fixed geometry is used, then the structure is simple, but the hydraulic functionality is limited
Solution Approach 1:
The control slide is designed with a geometrically appropriately shaped control edge that enables rotational movement about an axis parallel to the axial direction. This dynamic capability allows the control edge to assume different orientations, thereby creating different flow cross sections for hydraulic flow at a single axial working position, expanding hydraulic functionality without requiring multiple axial positions.
Solution Approach 2:
The invention adds a rotational degree of freedom to the control slide, moving from purely axial displacement to combined axial and rotational movement. This dimensional change allows the control edge to vary the flow cross section by rotation, enabling multiple hydraulic functions (different flow rates, pressure controls) at a single axial position that would traditionally require multiple axial positions.
2Adaptability or versatility
If multiple axial working positions are provided for different flow cross sections, then flow control is achieved, but the device becomes more complex and costly
Solution Approach 1:
Instead of providing multiple axial working positions with different control edge geometries, the invention uses a single axial position with a rotatable control edge. The control edge can be rotated to different angular positions to achieve different flow cross sections, replacing the need for multiple axial positions and reducing manufacturing complexity and cost.
3Reliability
If fixed flow cross sections are used, then the device is simple, but pressure losses increase and cavitation may occur
Solution Approach 1:
The rotatable control edge enables dynamic adjustment of the flow cross section at a single axial position. By rotating the control edge to appropriate angles, the flow cross section can be optimized for different operating conditions, reducing pressure losses and preventing cavitation without requiring complex multi-position axial mechanisms.
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.