Scroll Compressor Rotor Passage for Stator Cooling and Compactness
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Solution Overview
Problem
Existing electric compressors face challenges in achieving compactness while maintaining durability due to space constraints for the introduction passage, which can lead to inadequate cooling of the stator, resulting in reduced compressor durability.
Innovation Solution
The compressor design incorporates a balance weight positioned to cover part of the introduction passage, allowing refrigerant to flow through and cool the stator effectively, while maintaining compactness by forming introduction passages through the rotor and optimizing the balance weight's position to enhance centrifugal force and reduce runout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing is made compact to facilitate mounting, then the compressor size is reduced, but the space for the introduction passage between the housing and fixed block is insufficient, leading to inadequate stator cooling
Solution Approach 1:
The introduction passage is formed through the rotor itself, nesting the cooling passage within the rotating component. This eliminates the need for separate space between the housing and fixed block, allowing the passage to be integrated into the rotor structure while maintaining compact overall dimensions.
Solution Approach 2:
The introduction passage extends in the axial direction of the drive shaft, utilizing the axial dimension rather than relying on radial space between components. This dimensional shift allows effective cooling passage design within the constrained radial space of a compact compressor.
2Stability of the object's composition
If the balance weight is positioned to cover the introduction passage to enhance centrifugal force and reduce runout, then drive shaft stability is improved, but the passage may be blocked, preventing refrigerant flow
Solution Approach 1:
The balance weight is designed with a specific radial extent that covers only part of the introduction passage rather than completely blocking it. This local coverage provides sufficient centrifugal force and runout reduction while leaving adequate opening for refrigerant flow through the passage.
Solution Approach 2:
The balance weight extends partially over the introduction passage, providing enough coverage to achieve the desired centrifugal effect and stability improvement without excessive coverage that would block refrigerant flow. The partial action achieves the necessary stabilizing effect while maintaining fluid passage functionality.
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 enables a compact and durable electric compressor with improved refrigerant flow for effective stator cooling, reducing heat generation and extending the compressor's lifespan.
Implementation Method 1
the drive shaft receives centrifugal force that is generated by the balance weight due to the rotation of the drive shaft. This reduces runout of the drive shaft in a direction intersecting with the axis of the drive shaft
Implementation Method 2
the refrigerant flowing through the introduction passage cools the stator
Data Source
AI summary
An electric compressor includes a housing, a drive shaft, a motor, a fixed scroll, a movable scroll, and a fixed block. The fixed block is fixed to the housing and disposed between the motor and the movable scroll. The motor includes a stator and a rotor. The rotor has an introduction passage that is formed through the rotor in an axial direction of the drive shaft. The drive shaft includes a balance weight that is disposed between the fixed block and the motor. The balance weight extends to a position where the balance weight covers at least a part of the introduction passage in a radial direction of the drive shaft in a view in the axial direction of the drive shaft. The balance weight is located away from the rotor by a predetermined distance in the axial direction of the drive shaft.