Variable Volume Ratio Compressor Bypass Valve
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Solution Overview
Problem
Existing climate-control systems, such as heat-pump and refrigeration systems, face inefficiencies in compressor operation due to the inability to dynamically adjust volume ratios, leading to suboptimal performance under varying load conditions.
Innovation Solution
The compressor design incorporates a shell with scroll members, a partition plate, and a bypass valve system that includes a movable bypass valve member and a spring member, allowing for adjustment of fluid flow through bypass passages to prevent over-compression by switching between closed and open positions based on pressure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the compressor operates with a fixed volume ratio, then the structure is simple and reliable, but the system efficiency deteriorates under varying load conditions due to inability to adapt
Solution Approach 1:
The patent applies the dynamics principle by making the bypass valve member movable between closed and open positions, allowing the compressor to dynamically adjust its volume ratio in response to varying load conditions. This transforms the fixed-volume compressor into a variable-volume system, enabling adaptation to different operating requirements without requiring multiple fixed-configured compressors.
Solution Approach 2:
The patent implements parameter changes by altering the volume ratio parameter through the bypass valve mechanism. When the bypass valve opens, it creates an additional discharge path that effectively increases the displacement volume ratio, allowing the compressor to match its delivery capacity to actual system demands and thereby improving efficiency across varying load conditions.
2Reliability
If the bypass valve remains closed to maintain high compression ratio, then the compression efficiency is high, but the system suffers from over-compression during lighter load conditions
Solution Approach 1:
The patent incorporates feedback through the spring member that continuously monitors and responds to pressure differential conditions across the bypass valve. When system pressure indicates lighter load conditions, the spring force opens the bypass valve to relieve excessive compression, creating a self-regulating mechanism that prevents over-compression while maintaining optimal compression ratios during heavier loads.
Solution Approach 2:
The bypass valve member is designed to dynamically respond to operating conditions, transitioning between closed and open states based on real-time pressure differentials. This dynamic behavior allows the system to automatically adjust compression levels to match actual demand, preventing harmful over-compression during partial-load operation while maintaining efficient compression during full-load conditions.
3Object-generated harmful factors
If the bypass valve opens to prevent over-compression during lighter loads, then the harmful over-compression is eliminated, but the compression efficiency decreases
Solution Approach 1:
The system dynamically adjusts the bypass valve position based on actual operating conditions. During lighter loads, the valve opens to prevent over-compression, while during heavier loads, it closes to maximize compression efficiency. This conditional, dynamic behavior ensures that compression efficiency is maintained as high as possible across all operating ranges, with the bypass function activated only when necessary to prevent harmful over-compression.
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
This design enhances operational efficiency by preventing over-compression during lighter load conditions, optimizing system performance in both cooling and heating modes by dynamically adjusting the volume ratio of the compressor.
Implementation Method 1
a spring member disposed between the bypass valve retainer and the bypass valve member and biasing the bypass valve member toward the first position
Data Source
AI summary
A compressor may include a shell, first and second scroll members, a partition plate and a bypass valve member. The shell defines a discharge-pressure region and a suction-pressure region. The first scroll member is disposed within the shell and may include a first end plate having a discharge passage, and first and second bypass passages extending through the first end plate. The partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region and includes an opening in communication with the discharge-pressure region. The bypass valve member is movable between a first position restricting fluid flow through at least one of the first and second bypass passages and the opening and a second position in allowing fluid flow through the at least one of the first and second bypass passages and the opening.