Scroll Compressor Check Valve Venting for Faster Washer Closure
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Solution Overview
Problem
Conventional scroll compressors face issues with the washer of the check valve failing to close quickly due to adhesion of lubricating oil or insufficient pressure difference, leading to reverse noise and component wear during shutdown.
Innovation Solution
A check valve design with a valve plate, washer, and valve stopper featuring reverse flow holes and ventilation ports that enhance the pressure on the washer to ensure rapid closure by increasing the area of refrigerant gas acting on it, using a support ring to facilitate movement and integration of components for improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the washer is designed to close the valve hole using only pressure difference, then the structure remains simple, but the closing speed is insufficient due to adhesion of lubricating oil or insufficient pressure difference
Solution Approach 1:
The valve stopper is segmented into multiple edges (outer stopper edge, middle stopper edge, inner stopper edge) that create multiple gaps with the washer. This segmentation allows refrigerant gas to access different areas of the washer through reverse flow holes and ventilation ports, increasing the effective area subjected to pressure differential and thus improving closing speed without major structural complexity
Solution Approach 2:
The invention introduces reverse flow holes and ventilation ports that create additional fluid flow paths through the valve stopper structure. This adds a dimensional aspect to the pressure application, allowing refrigerant gas to reach both sides of the washer simultaneously through multiple routes, enhancing the pressure differential effect across the washer surface
2Reliability
If the washer moves slowly during shutdown, then reverse noise and component wear occur, but increasing pressure difference may cause other issues
Solution Approach 1:
The reverse flow holes and ventilation ports are pre-configured in the valve stopper to enable rapid pressure equalization and washer closure at the moment of shutdown. This preliminary structural arrangement ensures that when shutdown occurs, the refrigerant gas can immediately flow through these passages to apply pressure on the washer, achieving quick closure before reverse flow and noise can occur
Solution Approach 2:
The refrigerant gas acts as an intermediary force transmitted through the reverse flow holes and ventilation ports to the washer. This intermediary mechanism allows the pressure differential to be effectively transmitted to the washer surface, overcoming adhesion forces and ensuring reliable closure that prevents reverse fluid flow and associated harmful effects
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 enhanced pressure from refrigerant gas and lubricating oil adhesion improves the washer's separation speed and closing speed, preventing reverse fluid flow and reducing noise and wear in scroll compressors.
Implementation Method 1
the fluid flows into the gap between the outer stopper edge and the middle stopper edge through the reverse flow hole, then flows into the gap between the middle stopper edge and the inner stopper edge through the ventilation port, the washer moves to a bottom dead center along the valve stem under a pressure of the fluid
Implementation Method 2
due to the adhesion of lubricating oil or insufficient pressure difference between two sides of the washer, the washer cannot move downward quickly to close the valve hole
Data Source
AI summary
A check valve and a scroll compressor are provided. The check valve includes a valve plate, a washer, a valve stem, and a valve stopper. The valve stem is fixedly arranged between the valve plate and the valve stop, and the valve plate is provided with a valve hole for fluid to flow through. Annular outer, middle and inner stopper edges are provided on a bottom surface of the valve stopper from the edge to the center. A reverse flow hole is provided between the outer and middle stopper edges, and a ventilation port is provided on the middle stopper edge. The ventilation port is configured to connect a gap between the outer and middle stopper edges with the gap between the middle and inner stopper edges if the washer is in contact with the outer, middle and inner stopper edges.