Flow control valve
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Solution Overview
Problem
Flow control valves in refrigeration systems face challenges in operational reliability, particularly in maintaining consistent fluid pressure and reducing pressure differences, which affects their ability to effectively open and close, especially at small valve openings.
Innovation Solution
The design incorporates a valve core with a lower section portion positioned between first and second annular protrusions, where the minimum inner diameter of the first inner wall portion and the maximum outer diameter of the first outer wall portion, and the minimum and maximum diameters of the lower end portion are closely matched, ensuring balanced fluid pressure and reduced pressure differences, thereby enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve core is designed with a simple structure, then the device complexity is reduced, but the operational reliability deteriorates due to unbalanced fluid pressure and poor closing performance
Solution Approach 1:
The valve core is segmented into multiple functional portions: a body portion, a lower section portion with annular shape, and a lower end portion. This segmentation allows each portion to perform specific functions - the lower section portion balances fluid pressure while the lower end portion ensures reliable closing, thereby improving operational reliability without requiring complete structural redesign
Solution Approach 2:
Different portions of the valve core are given different local qualities and geometries. The lower section portion has an annular shape with specific diameter relationships (D3-D2 < 1-D4) to balance fluid pressure locally, while the lower end portion is designed for precise sealing. This local differentiation solves the pressure balance issue without complicating the entire valve core structure
2Manufacturing precision
If the valve opening is reduced to small openings for precise flow control, then the flow control precision is improved, but the operational reliability deteriorates due to unbalanced pressure differences affecting valve closing
Solution Approach 1:
The invention changes the geometric parameters of the valve core, specifically the diameter relationships (D3-D2 < 1-D4) of the lower section portion. This parameter optimization ensures that fluid pressure remains balanced even at small valve openings, allowing precise flow control to be achieved without compromising valve closing performance and operational reliability
3Ease of manufacture
If the valve core structure is simplified for ease of manufacture, then the manufacturing cost is reduced, but the operational reliability deteriorates due to inability to balance fluid pressure
Solution Approach 1:
The lower section portion of the valve core is designed with dynamic fluid pressure balancing capability. The annular geometry with specific diameter relationships allows the valve core to automatically balance fluid pressures during operation without requiring complex external mechanisms or multiple components, thus maintaining ease of manufacture while improving operational reliability
Data Source
AI summary
A flow control valve, includes a valve body component, a valve seat component and a valve core component, wherein the valve seat component includes a sealing ring, a first annular protruding portion and a second annular protruding portion; the valve core component includes a valve core including a lower section portion; when the valve core abuts against the sealing ring; the first annular protruding portion includes a first inner wall portion; the second annular protruding portion includes a first outer wall portion; and when the valve core abuts against the sealing ring, the minimum inner diameter of the first inner wall portion is D1, the maximum outer diameter of the first outer wall portion is D2, the minimum inner diameter of the lower end portion is D3, and the maximum outer diameter of the lower end portion is D4, then D3−D2<2 mm, and D1−D4<2 mm.