Flow-Limiting Core Geometry for Stable Pressure and Viscous Flow
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Solution Overview
Problem
Conventional flow control valves face challenges in accurately controlling flow and pressure, especially with high-viscosity fluids and materials with varying particle sizes, leading to increased resistance, inefficiency, and equipment failure due to design limitations and material constraints.
Innovation Solution
A flow and pressure control device featuring a valve body with a circular or elliptical cross section, a flow limiting core with an inclined inwardly recessed surface, and an adjustment mechanism to optimize the flow limiting section's geometry, increasing the inscribed circle radius for reduced resistance and improved control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flow control valves (ball valve, needle valve, gate valve) are used with traditional flow limiting section designs (olive-shaped, annular ring, sector section), then the structure is simple and easy to manufacture, but the inscribed circle radius of the passage section is small, leading to increased flow resistance, reduced efficiency, and higher energy consumption especially in high-viscosity fluid and small pipe diameter applications
Solution Approach 1:
The patent applies spheroidality by designing the flow limiting core with a spherical body and spherical cap structure, creating a passage section with a large inscribed circle radius. The spherical geometry naturally provides smooth curved surfaces that reduce flow resistance compared to traditional olive-shaped or annular ring designs, while maintaining ease of manufacture through standard spherical machining processes.
2Device complexity
If conventional flow control valves are used, then the device complexity is low, but the accuracy of flow control is insufficient especially for micro-flow control and high precision applications, and the device is sensitive to material unevenness and particle size variations
Solution Approach 1:
The patent applies local quality by designing the flow limiting core with different geometric features in different regions: the spherical cap portion provides smooth flow control for high precision applications, while the cylindrical portion and inclined recessed surface handle coarser materials and particle size variations. This localized optimization allows the simple device structure to achieve high flow control accuracy and resistance to material unevenness.
3Ease of manufacture
If conventional flow control valves with small inscribed circle radius are used, then the manufacturing cost is low, but the durability is poor due to increased susceptibility to clogging from impurities and carbon deposits, leading to equipment failure and requiring frequent maintenance
Solution Approach 1:
The spherical cap design creates a large inscribed circle radius that prevents clogging by impurities and carbon deposits. The smooth curved geometry of the spherical cap allows particles to pass through more easily and reduces areas where deposits can accumulate, significantly improving durability and reliability while maintaining low manufacturing costs through standard spherical machining.
4Ease of operation
If conventional needle valves with annular ring passage section are used, then the adjustment range is adequate, but the flow control stability is poor under high viscosity conditions and the energy consumption is high due to increased flow resistance
Solution Approach 1:
The spherical cap passage section replaces the annular ring design, creating a larger inscribed circle radius that reduces flow resistance. The curved spherical geometry provides smooth flow paths that maintain adequate adjustment range while significantly reducing energy consumption in high-viscosity fluid applications by minimizing turbulence and resistance.
Data Source
AI summary
A flow and pressure control device includes: a valve body, a flow limiting core and an adjustment device. The valve body includes: an outlet pipe, a transition cavity and an inlet pipe having a circular or elliptical cross section. The flow limiting core can be completely inserted into the inlet pipe, and blocks a fluid passage of the inlet pipe. An inclined and inwardly recessed surface is provided at an end portion of the flow limiting core. The adjustment device is used to adjust the depth by which the flow limiting core is inserted into the inlet pipe. An operating section of the flow and pressure control device is approximately circular or approximately elliptical or is a combination of a partially circular shape and a partially elliptical shape.