Compressor Welding Pin Connection with Low-Rigidity Support Design
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Solution Overview
Problem
The existing compressor designs face challenges in maintaining a strong holding force for the welding pin due to thermal expansion, leading to potential displacement and reduced fixing force, especially when moments act on the drive shaft and bearing housing.
Innovation Solution
Incorporating a low rigidity region around the holes where the welding pin is press-fitted, which includes a thin portion and a void portion, allows for deformation during thermal expansion, thereby suppressing plastic deformation of the welding pin and maintaining a higher holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the welding pin is press-fitted into the hole of the support and welded to the casing, then the support is fixed to the casing, but the welding pin undergoes plastic deformation due to thermal expansion during welding, reducing the holding force
Solution Approach 1:
The support structure is designed with non-uniform thickness, creating a thin portion adjacent to the hole where the welding pin is press-fitted. This local variation in geometry provides lower rigidity in the specific region surrounding the hole, allowing the support to deform more easily during welding to accommodate thermal expansion of the welding pin, thereby suppressing plastic deformation of the welding pin and maintaining its holding force.
2Stability of the object's composition
If the support has high rigidity to maintain structural stability, then the support can withstand operational loads, but the welding pin experiences greater restraint during thermal expansion, leading to increased plastic deformation
Solution Approach 1:
The support is designed with a thin portion adjacent to the hole, creating a localized low-rigidity region. This allows the support to have different rigidity characteristics in different regions: the thin portion provides flexibility to accommodate welding pin thermal expansion and minimize plastic deformation, while other portions of the support maintain sufficient rigidity to ensure structural stability and positioning accuracy during operation.
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
The low rigidity region effectively suppresses excessive plastic deformation of the welding pin, ensuring a larger holding force after welding and preventing displacement, even under operational forces.
Implementation Method 1
maintaining a strong holding force for the welding pin due to thermal expansion
Data Source
AI summary
A compressor includes an actuator, a compression mechanism, a drive shaft, a support, a casing, and a welding pin. The drive shaft transmits a driving force of the actuator to the compression mechanism. The support supports a bearing that rotatably supports the drive shaft. The support has at least one hole formed in an outer surface. The casing has a cylindrical shape and accommodates the drive shaft and the support. The welding pin is press-fitted into the hole of the support and is welded and fixed to the casing. A low rigidity region is provided at at least a part of a periphery of an adjacent portion adjacent to the hole of the support. The low rigidity region has lower rigidity than the adjacent portion. The low rigidity region includes a thin portion having a smaller thickness in a radial direction of the casing than the adjacent portion.