Valve Body Groove Geometry for Precise Low-Opening Flow Control
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Solution Overview
Problem
Existing valve devices are unable to accurately control flow rates in the low opening range, limiting their precision in fluid flow management.
Innovation Solution
A valve device with a rotational shaft and a valve body featuring a first communication hole and a bottomed groove, where the groove's depth or width increases towards the communication hole, allowing for precise control of the flow rate by adjusting the groove's geometry to manage the flow passage area effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional valve body with simple openings is used, then the device complexity is low, but the flow rate control precision in low opening range is insufficient
Solution Approach 1:
The valve body incorporates a bottomed groove with specific geometric characteristics (depth and width variations) localized at the flow passage formation portion. This local structural modification enables precise flow rate control in the low opening range without requiring complex changes to the entire valve body structure, thus resolving the contradiction between control precision and device complexity.
Solution Approach 2:
The invention changes the geometric parameters of the flow passage by forming a bottomed groove with controlled depth and width. This parameter modification allows the minimum flow passage area to change smoothly with rotation angle, achieving high flow rate control precision in the low opening range while maintaining a relatively simple valve body structure.
2Measurement precision
If the groove depth and width are increased to improve flow rate control, then the manufacturing precision requirements increase, but this may cause thin mold portions and potential breakage
Solution Approach 1:
The bottomed groove is designed with specific local geometric characteristics where depth and width are controlled within defined ranges. This localized structural design achieves precise flow control while avoiding excessive material removal that would create thin mold portions, thus preventing breakage and maintaining device reliability.
Solution Approach 2:
The invention applies partial action by forming a bottomed groove with controlled depth and width rather than removing excessive material. This partial modification is sufficient to achieve smooth flow passage area changes and high flow rate control precision without creating structurally weak thin portions, thereby maintaining valve device durability.
Data Source
AI summary
A valve device 1 includes a rotational shaft 2, and a valve body 4 internally forming a space 10 and rotatable about the rotational shaft 2, the valve body 4 having an outer circumferential surface 28 where a first communication hole 36 and a bottomed groove 38 are formed, the first communication hole 36 communicating with the space 10, the bottomed groove 38 extending from the first communication hole 36 toward one side in a rotational direction of the rotational shaft 2, and the groove 38 including a first section 40 in which at least one of a depth D of the groove 38 and a width W of the groove 38 increases toward the first communication hole 36.