Compressor Balance Weight Radial Extension
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Solution Overview
Problem
Conventional motor-driven compressors face challenges in reducing the weight of the balance weight while maintaining sufficient centrifugal force to suppress drive shaft wobble, due to limited space between the movable scroll and the stationary block.
Innovation Solution
The compressor design includes a balance weight arranged between the stationary block and the stator, with a tubular stator core and annular coil end, allowing the balance weight to extend radially and axially, covering part of the coil end, which generates centrifugal force at positions farther from the rotation axis, thus reducing wobble without increasing axial length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the balance weight is arranged between the movable scroll and the stationary block, then the space for radial extension is limited, but this arrangement is conventional and structurally simple
Solution Approach 1:
The balance weight is repositioned from the conventional location between the movable scroll and stationary block to a new location between the stationary block and stator. This spatial relocation in the axial dimension creates sufficient radial extension space while maintaining structural integration, allowing the balance weight to extend farther radially without increasing axial length.
2Weight of moving object
If the balance weight weight is reduced, then the overall compressor weight decreases, but the centrifugal force generated is insufficient to suppress drive shaft wobble
Solution Approach 1:
Instead of increasing balance weight mass to generate sufficient centrifugal force, the invention changes the geometric parameters by extending the balance weight's radial length. This allows centrifugal force to be generated at positions farther from the rotation axis, maintaining adequate wobble suppression while using less material and reducing overall weight.
Solution Approach 2:
The balance weight is positioned to extend radially outward into the space between the stationary block and stator, utilizing the radial dimension more effectively. This radial extension increases the moment arm for centrifugal force generation without increasing mass, resolving the contradiction between weight reduction and force generation.
3Force
If the balance weight extends farther in the radial direction, then centrifugal force is generated at positions farther from the rotation axis, but the axial length increases
Solution Approach 1:
The stationary block serves multiple functions: it supports the drive shaft rotationally, provides structural separation between the compressor mechanism and motor mechanism, and creates the necessary space for the balance weight to extend radially. By utilizing the stationary block's multi-functionality, the design achieves effective centrifugal force generation without increasing axial length.
Solution Approach 2:
The balance weight's centrifugal force generation is achieved primarily in the radial dimension rather than extending axially. By repositioning the balance weight between the stationary block and stator and allowing radial extension, the invention generates effective centrifugal force while maintaining compact axial dimensions.
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 effectively suppresses drive shaft wobble while reducing weight and limiting axial length increase, allowing the drive shaft to rotate suitably, and facilitates manufacturing by integrating the balance weight with the drive shaft.
Implementation Method 1
the centrifugal force generated by the balance weight through the rotation of the drive shaft acts on the drive shaft. This suppresses wobble in the radial direction of the drive shaft during rotation
Data Source
AI summary
A compressor includes a housing, a stationary block, a drive shaft, a motor mechanism, a stationary scroll, and a movable scroll. The stationary block is fixed to the housing and is arranged between the motor mechanism and the movable scroll. The motor mechanism includes a stator and a rotor. The drive shaft is provided with a balance weight. The balance weight extends in the radial direction of the drive shaft and is arranged between the stationary block and the stator. The stator includes a stator core and a coil end. The balance weight covers a part of the coil end in the radial direction and the axial direction of the drive shaft.