Scroll Compressor End Plate Deformation Control
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Solution Overview
Problem
In electrically driven scroll compressors, the diameter expansion deformation of the intermediate housing due to the electric motor fixation leads to reduced accuracy of the supporting surface for the orbiting scroll, affecting the compressor's performance and reliability.
Innovation Solution
Incorporating a low rigidity part with reduced rigidity compared to the motor fixing and end plate, which absorbs the diameter expansion deformation of the motor fixing part, thereby minimizing stress and maintaining the accuracy of the supporting surface for the orbiting scroll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electric motor is fixed within the intermediate housing via close-fitting, then the motor is securely held, but the intermediate housing undergoes diameter expansion deformation which reduces the accuracy of the supporting surface for the orbiting scroll
Solution Approach 1:
The intermediate housing is segmented into three functional parts: a motor fixing part for securing the electric motor, a low rigidity part for absorbing deformation, and an end plate for supporting the orbiting scroll. This segmentation allows each part to perform its specific function independently, preventing deformation from the motor fixing part from affecting the end plate's supporting surface accuracy.
Solution Approach 2:
Different parts of the intermediate housing are given different rigidity characteristics. The motor fixing part has high rigidity to securely hold the motor, while the low rigidity part has reduced rigidity to absorb diameter expansion deformation, and the end plate maintains high rigidity to ensure supporting surface accuracy. This local differentiation of mechanical properties resolves the contradiction between motor fixation strength and supporting surface accuracy.
2Manufacturing precision
If the intermediate housing is made rigid to maintain supporting surface accuracy, then the orbiting scroll can revolve accurately, but the diameter expansion deformation from the electric motor cannot be absorbed, causing stress concentration
Solution Approach 1:
The low rigidity part acts as an intermediary element between the motor fixing part and the end plate. It absorbs the diameter expansion deformation generated by the electric motor through elastic deformation, preventing this deformation from being transmitted to the end plate. This intermediary structure protects the supporting surface accuracy while ensuring uniform stress distribution and preventing stress concentration.
Solution Approach 2:
The rigidity parameter of the intermediate housing is changed in the low rigidity part to create a deformation-absorbing zone. By reducing the rigidity in this specific region, the housing can elastically deform to absorb the diameter expansion from the motor, thereby protecting the end plate's supporting surface from deformation while maintaining overall structural integrity and uniform stress distribution.
3Manufacturing precision
If a low rigidity part is added to absorb deformation, then the supporting surface accuracy is maintained, but the device complexity increases
Solution Approach 1:
The motor fixing part, low rigidity part, and end plate are merged into a single integrated intermediate housing component. This integration allows the housing to perform multiple functions simultaneously: fixing the electric motor, absorbing diameter expansion deformation, and supporting the orbiting scroll with high accuracy. By combining these functions into one part rather than using separate components, the invention maintains supporting surface accuracy while minimizing device complexity.
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 solution suppresses the deformation of the end plate, enhances the accuracy of the orbiting scroll's revolution, and improves the overall performance and reliability of the compressor by evenly distributing the diameter expansion deformation across the circumference.
Implementation Method 1
the low rigidity part having rigidity smaller than in the motor fixing part 12 and the end plate 13, is elastically deformed by the diameter expansion deformation of the motor fixing part 12
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
[Object] To improve the accuracy of the supporting surface for an orbiting scroll by suppressing the deformation of an end plate. [Solution] An electrically driven scroll compressor 1 includes a compression mechanism accommodation housing member 5 for accommodating a compression mechanism 3 that is a combination of a fixed scroll 11 and an orbiting scroll 21 and a motor accommodation housing member 6 for accommodating an electric motor 4 for driving the compression mechanism 3. The motor accommodation housing member 6 includes a motor fixing part 12 to which a stator 16 of the electric motor 4 is fixed by close-fitting, an end plate 13 having an orbiting scroll side end surface 22 that is a support surface for the orbiting scroll 21, and a low rigidity part 14 for making connection between the motor fixing part 12 and the end plate 13. The low rigidity part 14 has rigidity lower than in the motor fixing part 12 and the end plate 13. When the stator 16 is fixed to the motor fixing part 12 by close-fitting and the motor fixing part 12 undergoes diameter expansion deformation, the low rigidity part 14 is elastically deformed to absorb the elastic deformation of the motor fixing part 12.