Scroll Compressor Intermediate Casing Refrigerant Flow Segmentation
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Solution Overview
Problem
Existing scroll compressors face increased production costs and reduced performance due to the complexity of producing refrigerant flow passages around the stator, which complicates the manufacturing process and decreases electric motor efficiency.
Innovation Solution
A scroll compressor design featuring a sealed enclosure with an intermediate casing and connecting means that include a refrigerant circulation duct and distal windows, guiding refrigerant flow from the stator's distal chamber to the compression stage without contacting the stator's core, using standard components to simplify production and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant flow passages are produced by removing material on the periphery of the stator, then the electric motor cooling is improved, but the performance of the electric motor decreases and production costs increase
Solution Approach 1:
The invention divides the refrigerant flow path into separate segments: one path for cooling the stator windings and another path for cooling the rotor, achieved through the intermediate casing with distinct inlet openings and flow passages. This segmentation allows optimized cooling for each component without interfering with motor performance
Solution Approach 2:
The intermediate casing acts as an intermediary structure that directs refrigerant flow separately to different components. It provides dedicated flow passages that guide refrigerant to cool the stator windings and rotor independently, eliminating the need to remove material from the stator periphery
2Temperature
If refrigerant flow passages are produced by removing material on the periphery of the stator, then the electric motor cooling is improved, but the production complexity and costs increase
Solution Approach 1:
The cooling system is segmented into separate functional components: the intermediate casing with dedicated flow passages, distinct from the stator structure. This allows the stator to be manufactured as a standard component without complex material removal operations
Solution Approach 2:
The intermediate casing serves as an intermediary that provides the cooling flow passages, eliminating the need to modify the stator structure. This separates the cooling function from the stator manufacturing process, simplifying production
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 configuration reduces manufacturing costs and enhances the compressor's performance by simplifying the production process and improving refrigerant flow management, while preventing liquid refrigerant suction into the compression stage during startup or transitional phases.
Implementation Method 1
the connecting means being arranged to guide a refrigerant flow from the distal chamber toward the compression stage
Implementation Method 2
the first part of each circumferential flow makes it possible to cool the first end winding of the stator, while the second part of each circumferential flow makes it possible to cool the second end winding of the stator, the core of the stator and rotor
Data Source
AI summary
The compressor includes a sealed enclosure containing a compression stage, an electric motor having a stator provided with a first and second end windings, an intermediate casing surrounding the stator so as to define an annular outer volume with the sealed enclosure, connecting means arranged to fluidly connect the compression stage and a distal chamber defined by the intermediate casing and the electric motor and comprising the second end winding, and a refrigerant suction inlet emerging in the annular outer volume. The connecting means include at least one refrigerant circulation duct situated outside the intermediate casing, and at least one distal window formed on the intermediate casing and emerging on the one hand in the at least one refrigerant circulation duct and on the other hand in the distal chamber near the second end winding of the stator.