Rotatable Hydraulic Spool Valve for Variable Flow Cross-Sections
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Solution Overview
Problem
Conventional hydraulic control valve units lack the ability to efficiently regulate hydraulic flow with varied flow cross-sections and pressure settings, leading to suboptimal performance and potential stress on components due to uneven flow distribution.
Innovation Solution
A hydraulic control valve unit with an axially and rotatably adjustable control slide, featuring a control edge with axially offset edge sections, allowing for stepless and variable flow cross-section adjustments through different rotational positions, enhancing the control of hydraulic flow and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional control slide with uniform control edges is used, then the structure is simple and manufacturing is easy, but the flow cross-section cannot be varied efficiently leading to suboptimal hydraulic performance
Solution Approach 1:
The control slide is divided into multiple control segments along its axial direction, with each segment having independently configured control edges. This segmentation allows different sections of the control slide to have different geometric profiles, enabling varied flow cross-sections at different axial positions while maintaining a modular structure that balances functionality with manufacturing feasibility
Solution Approach 2:
Different control segments are equipped with control edges having specific local geometries (axially offset inner and outer edge sections) to create desired flow characteristics at particular locations. This local differentiation allows precise control of hydraulic flow at specific segments without requiring complex geometry throughout the entire control slide, optimizing performance where needed while keeping other sections simpler
2Manufacturing precision
If the control edge has axially offset inner and outer edge sections creating variable flow cross-sections, then flow control precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The control edges are designed with asymmetric geometries where inner edge sections are offset axially relative to outer edge sections, creating non-uniform flow cross-sections. This asymmetric design enables precise flow control at different radial positions, allowing the inner regions to have different flow characteristics than the outer regions, thereby achieving superior flow distribution control
Solution Approach 2:
The control slide is made rotatable about its axial axis, transforming a static control structure into a dynamic one. By rotating the control slide to different angular positions, the variable flow cross-sections created by the offset edge sections can be selectively positioned, enabling continuous adjustment of hydraulic flow characteristics without requiring multiple different control slides
3Device complexity
If a single control slide performs multiple control functions through rotation, then device complexity is reduced, but the control characteristics become more difficult to detect and measure
Solution Approach 1:
A single control slide is designed to perform multiple hydraulic control functions through its rotatable variable geometry. The same control slide structure, with its offset control edge sections, can create different flow cross-sections and control different hydraulic circuits depending on its rotational position, eliminating the need for multiple separate control slides or valves while providing versatile flow control capabilities
Solution Approach 2:
The control system exploits changes in geometric parameters (flow cross-section area, shape, and distribution) as the control slide rotates. By varying the angular position of the control slide, the effective flow cross-sections change continuously, allowing dynamic adjustment of hydraulic flow characteristics. This parameter variation enables a single structure to provide multiple control functions that would traditionally require separate devices
Data Source
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AI summary
The invention relates to a hydraulic control valve unit (10) for controlling a hydraulic working load. The control valve unit (10) includes a control spool (14) that can be moved into different working positions in an axial direction (18) for controlling hydraulic flow between hydraulic ports (22, 24, 26, 28, 30) of the control valve unit (10). Furthermore, the control valve unit (10) has a spool housing (34) surrounding the control spool (14). The control spool (14) has at least one control segment (42, 56, 58, 60) which is bounded in the axial direction (18) by a control edge and interacts with an axial housing segment (44, 62, 64, 66) of the spool housing (34) to control a flow cross-section for hydraulic flow at this control segment (42, 56, 58, 60). The control slide (14) can be driven rotationally about a rotational axis (36).The control edge of at least one control segment (58, 60) and/or the housing segment (64, 66) interacting with this control segment (58, 60) is designed such that the flow cross-section for hydraulic flow at this control segment (58, 60) is of different size depending on different rotational positions of the control spool (14).