Hydraulic Valve Spool Flow Guiding Structure
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Solution Overview
Problem
Hydraulic slide valves face significant challenges due to static flow forces that increase the operational force required, especially at high pressures and flow rates, leading to inefficiencies and potential failure in manipulation, and existing solutions complicate the design and increase costs.
Innovation Solution
A hydraulic valve design featuring a spool with flow guiding structures within the valve chamber, including a pressure chamber and working chambers with strategically positioned shoulders and flow guiding slopes, which alter the flow path of hydraulic fluid to reduce static flow forces, allowing the spool to operate with lower resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional valve chamber design is used, then manufacturing is simpler, but static flow force increases operational difficulty
Solution Approach 1:
The valve chamber is segmented into distinct functional zones: a pressure chamber for hydraulic fluid storage, a working chamber for actuation, and intermediate chambers with flow guiding structures. This segmentation allows independent optimization of each zone's flow characteristics, reducing static flow force while maintaining manufacturability through modular design
Solution Approach 2:
Flow guiding structures act as intermediary elements between the pressure chamber and working chamber. These intermediate structures include flow guiding slopes and transition passages that mediate the hydraulic fluid flow, gradually changing flow direction and reducing momentum change, thereby lowering static flow force without requiring complex external systems
2Ease of operation
If flow guiding structures are added to reduce static flow force, then valve operation improves, but manufacturing complexity increases
Solution Approach 1:
The flow guiding structures are merged with the valve body as integral features rather than separate components. The flow guiding slopes and transition passages are formed directly during valve body casting, combining the valve body structure with flow control functionality. This integration reduces part count and assembly complexity while maintaining the flow force reduction benefits
Solution Approach 2:
The flow guiding structures utilize carefully controlled geometric parameters including slope angles, passage cross-sections, and transition曲率 to optimize flow characteristics. By adjusting these parameters during design, the patent achieves reduced static flow force while keeping the structures compatible with standard casting and machining processes
3Ease of operation
If pilot valve is employed to control main spool, then flow force is reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts the flow control function from a separate pilot valve system and integrates it directly into the main valve chamber structure. The flow guiding structures perform the function previously requiring a pilot valve by directly shaping the hydraulic fluid flow paths, eliminating the need for additional pilot valve components and their associated complexity
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 effectively reduces static flow forces, simplifies the manufacturing process, and lowers the overall cost of the valve while enabling efficient operation with reduced electromagnetic drive force requirements, improving valve performance and reducing noise and pressure drop.
Implementation Method 1
when the hydraulic fluid flows through the valve port, the spool will be suffered from an extra acting force, i.e., a flow force, since the change in the flow direction and flow rate will vary hydraulic fluid momentum
Implementation Method 2
the change in the flow direction and flow rate will vary hydraulic fluid momentum
Data Source
AI summary
A hydraulic valve comprises: a spool; and a valve body defining a valve chamber for receiving the spool, wherein the spool is adapted to linearly reciprocate within the valve chamber in an axial direction, the valve chamber at least comprises a pressure chamber and a first working chamber, between which a first valve body shoulder is provided on the valve body, and the spool has a first spool shoulder adapted to contact with or axially disengage from the first valve body shoulder in order to hydraulically isolate the pressure chamber from the first working chamber or communicate the pressure chamber with the first working chamber.