Scroll Compressor Capacity Modulation via Axial Biasing Chamber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compressors face challenges in efficiently varying output to match different operating conditions, as existing capacity modulation assemblies are not effective in optimizing compressor performance across varying pressures and loads.
Innovation Solution
The compressor design incorporates a shell assembly, scroll members, a seal assembly, a modulation control chamber, and a modulation control valve, which allows for meshing spiral wraps to form pockets and an axial biasing chamber, enabling fluid communication between suction and discharge pressure regions through a modulation control valve that can switch between modes to adjust compressor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacity modulation assembly is included in the compressor, then compressor output can be varied to match different operating conditions, but the existing assemblies are not effective in optimizing compressor performance across varying pressures and loads
Solution Approach 1:
The patent introduces an axial biasing chamber as an intermediary element between the suction pressure region and the discharge pressure region. This biasing chamber, coupled with biasing passages and a modulation control valve, acts as a mediator to gradually modulate compressor capacity. The intermediary structure enables controlled pressure equalization and capacity adjustment, resolving the contradiction by providing both adaptability through modulation and reliability through stable, controlled performance across varying conditions.
2Productivity
If the modulation control valve restricts communication between the axial biasing chamber and the suction pressure region, then compressor capacity is reduced, but this may cause instability in pressure regions
Solution Approach 1:
The patent implements dynamic capacity modulation through the modulation control valve, which can adjust the communication between the axial biasing chamber and the suction pressure region based on operating conditions. The system transitions from static to dynamic control, allowing the compressor to adapt capacity while maintaining stability through controlled, gradual pressure equalization rather than abrupt changes.
Solution Approach 2:
The patent changes the pressure parameters within the axial biasing chamber by controlling fluid communication through the modulation control valve. By adjusting the pressure differential across the biasing chamber and utilizing biasing passages, the system modulates capacity while maintaining stable operation through controlled parameter transitions rather than abrupt changes.
3Loss of energy
If the seal assembly isolates the discharge pressure region from the suction pressure region, then compression efficiency is improved, but capacity modulation becomes more difficult
Solution Approach 1:
The patent segments the compression system into distinct pressure regions (suction, discharge, and axial biasing chamber) separated by the seal assembly. This segmentation maintains compression efficiency by preventing pressure mixing while enabling capacity modulation through controlled connections via biasing passages and the modulation control valve. The segmented structure allows independent control of each region's pressure and flow characteristics.
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 allows for efficient adjustment of compressor capacity between fully loaded, part-loaded, and unloaded conditions, optimizing performance across different operating conditions by controlling fluid communication through the modulation control valve, thereby enhancing operational efficiency.
Implementation Method 1
The modulation control valve may be movable between a first position allowing communication between the second passage and the suction pressure region and a second position restricting communication between the second passage and the suction pressure region
Implementation Method 2
The biasing passage may be in communication with a first of said pockets and the axial biasing chamber
Implementation Method 3
The modulation control chamber may be fluidly coupled with the axial biasing chamber by a first passage
Data Source
AI summary
A compressor may include a shell, first and second scrolls, a seal assembly, a modulation control chamber, and a modulation control valve. The first scroll may include a first end plate having a biasing passage extending therethrough. The seal assembly may isolate a discharge pressure region from a suction pressure region. The seal assembly and the first scroll may define an axial biasing chamber therebetween that communicates with the axial biasing chamber and a first pocket between the first and second scrolls. The modulation control chamber may be fluidly coupled with the biasing chamber by a first passage. The modulation control valve may be fluidly coupled with the modulation control chamber by a second passage and movable between a first position allowing communication between the second passage and the suction pressure region and a second position restricting communication between the second passage and the suction pressure region.