Check Valve Flaring Cavity Structure to Prevent Throttling
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Solution Overview
Problem
Check valves in hydraulic and refrigeration systems face throttling issues due to the expansion of sealing members when the piston moves, hindering normal operation and fluid flow.
Innovation Solution
The check valve design includes a flaring portion within the valve body with a greater cross-sectional flow area than the valve port, along with a guiding rod and resilient member configuration that minimizes deflection and enhances smooth movement, preventing throttling and improving circulation capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston moves within the valve cavity to open/close the valve port, then the check valve can control fluid flow direction, but the sealing member expands causing throttling and impeding refrigerant flow
Solution Approach 1:
The valve cavity is segmented into different sections with varying cross-sectional areas. The throttling section has a smaller cross-sectional area where the sealing member expands, while the expansion section has a larger cross-sectional area that allows the sealing member to expand without impeding overall refrigerant flow. This segmentation resolves the contradiction by localizing the throttling effect to a specific region while maintaining adequate flow capacity in other regions.
Solution Approach 2:
The patent introduces a dimensional change by varying the cross-sectional area of the valve cavity along the flow direction. By creating an expansion section with a larger cross-sectional area adjacent to the throttling section, the design accommodates the sealing member's expansion in an additional spatial dimension, preventing it from obstructing the main refrigerant flow path.
2Reliability
If the sealing member expands during piston movement, then sealing performance improves, but flow area is reduced causing throttling
Solution Approach 1:
The valve cavity is designed with non-uniform cross-sectional areas at different locations. The throttling section has a smaller cross-sectional area optimized for sealing contact with the piston, while the expansion section has a larger cross-sectional area that compensates for the space occupied by the expanding sealing member. This local quality variation allows the sealing member to expand fully for good sealing performance without significantly reducing the overall flow area.
3Productivity
If the valve cavity cross-sectional area is increased to prevent throttling, then refrigerant flow improves, but device complexity increases
Solution Approach 1:
The valve cavity employs a dynamic cross-sectional area design that varies along the flow direction. The cavity transitions from a smaller cross-sectional area in the throttling section to a larger cross-sectional area in the expansion section. This dynamic variation allows the structure to adapt to the changing spatial requirements during piston movement and sealing member expansion, maintaining adequate refrigerant flow without requiring a uniformly large and complex valve cavity.
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 prevents throttling and enhances the circulation capacity by ensuring smooth fluid flow and reliable sealing, reducing the risk of refrigerant obstruction and improving the overall performance of the check valve.
Implementation Method 1
two ends of the resilient member are connected with the piston rod and the guiding rod respectively
Data Source
AI summary
A check valve is provided. The check valve includes a valve body and a piston unit. The valve body includes a valve cavity and a valve port. The valve body is provided with an inlet and an outlet. The valve port is located between the inlet and the valve cavity. The outlet is in communication with the valve cavity. The piston unit is capable of moving in the valve cavity along an axis of the valve body to open/close the valve port. The valve cavity includes a flaring portion. Along the axis of the valve body, a flow area of a cross section of the flaring portion is greater than a flow area of a cross section of the valve port.