Variable Swash Plate Compressor Valve Assembly Flow and Stress
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Solution Overview
Problem
Variable swash plate compressors face challenges in increasing refrigerant flow rate without enhancing driving speed, leading to noise, pulsation, and reduced durability due to stress concentration and fatigue in the suction reed's base end portion.
Innovation Solution
The valve assembly design includes a suction reed with a catching end and leg sections that distribute stress, a wider suction port, and a discharge reed with increased width, along with specific arc and recessed portions to enhance flow rates and durability by reducing stress concentration and improving torsional rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If driving speed is increased to increase refrigerant flow rate, then flow rate is improved, but noise and pulsation increase
Solution Approach 1:
The patent changes the geometric parameters of the suction reed structure, specifically increasing the width of the catching end and adjusting the dimensions of leg sections, to improve flow rate without increasing driving speed, thereby avoiding noise and pulsation issues
Solution Approach 2:
The patent enhances the width dimension of the suction reed's catching end and leg sections to increase flow capacity, providing an alternative solution that does not rely on increasing rotational speed
2Productivity
If driving speed is increased to increase refrigerant flow rate, then flow rate is improved, but durability deteriorates due to stress concentration and fatigue
Solution Approach 1:
The patent modifies structural parameters of the suction reed, particularly widening the catching end and adjusting leg section dimensions, to distribute stress more evenly and prevent fatigue failure while maintaining flow rate
Solution Approach 2:
The patent introduces arc-shaped portions at the base end of the suction reed to smooth stress distribution and eliminate sharp corners that cause stress concentration and fatigue
3Productivity
If suction reed width is increased to increase flow rate, then flow rate is improved, but torsional rigidity decreases
Solution Approach 1:
The patent applies different width characteristics to different parts of the suction reed: the catching end has increased width for flow rate, while the leg sections have optimized width distribution to maintain torsional rigidity, creating local quality variations that satisfy multiple requirements
Solution Approach 2:
The patent creates a composite structural design combining sections with different width characteristics and arc-shaped portions, effectively combining the benefits of increased flow rate with maintained structural rigidity
Data Source
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AI summary
Disclosed herein is a valve assembly for a variable swash plate compressor. Since an opening hole of a suction reed is enlarged toward a suction port of a valve plate and refrigerant is also introduced into a cylinder bore through the opening hole when the suction port is opened, performance of a compressor may be enhanced by an increase in flow rate.