Scroll Compressor Capacity Modulation and Variable Volume Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional scroll compressors lack effective mechanisms for varying operating capacity and volume ratio, limiting their efficiency and adaptability in different operational conditions.
Innovation Solution
The compressor design incorporates a shell assembly with a capacity modulation valve assembly and a variable volume ratio valve assembly, allowing for selective fluid communication between compression pockets and pressure regions, enabling adjustable output and efficiency through meshingly engaged spiral wraps and end plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional scroll compressors use fixed compression pockets, then the structure is simple, but the capacity modulation and volume ratio adjustment are limited
Solution Approach 1:
The compression mechanism is divided into multiple intermediate compression pockets (first, second, third) with independent fluid communication paths. Each pocket can be selectively connected to suction or discharge regions through separate valve assemblies, enabling independent control of capacity and volume ratio for each pocket
Solution Approach 2:
The end plate is designed as a multi-functional component that integrates multiple ports (modulation ports and variable volume ratio ports) to control different compression pockets. This universal design allows a single component to manage both capacity modulation and volume ratio adjustment across multiple pockets
2Productivity
If intermediate compression pockets are selectively connected to suction region, then capacity modulation is improved, but fluid communication control complexity increases
Solution Approach 1:
The modulation valve assembly acts as an intermediary mechanism between the intermediate compression pockets and the suction/discharge regions. It provides controlled fluid communication by selectively opening or closing passages, enabling capacity modulation without direct complex routing
Solution Approach 2:
The system uses fluid pressure differentials and pneumatic control to manage the opening and closing of valve assemblies. The fluid communication between compression pockets and pressure regions is controlled through pneumatic actuation of the valve mechanisms
Data Source
AI summary
A compressor is provided and may include a shell assembly defining a suction pressure region and a discharge pressure region. A first scroll member may include a first discharge port and a first modulation port. A second scroll member may include a first variable volume ratio port. A capacity modulation valve assembly may be in fluid communication with the first modulation port and may be displaceable between open and closed positions to selectively provide communication between a first intermediate compression pocket and the suction pressure region via the first modulation port. A variable volume ratio valve assembly may be in fluid communication with the first variable volume ratio port. The variable volume ratio valve assembly may be displaceable between open and closed positions to selectively provide communication between a second intermediate compression pocket and the discharge pressure region via the first variable volume ratio port.