Scroll Compressor Balance Weight Centrifugal Force Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing scroll compressors with balance weights face issues of biased contact between the slider and rocking bearing due to centrifugal force misalignment, leading to decreased reliability and increased costs due to larger size and material requirements.
Innovation Solution
A scroll compressor design where the balance weight portion is structured with a main weight and counter-weight to align the centrifugal force center with the rocking bearing, preventing biased contact while maintaining a compact size by ensuring the distance between the centrifugal force center and rocking bearing is less than 0.09 times the rocking bearing's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connection part between the cylindrical portion and balance weight portion is made thick to bear centrifugal force, then the strength is improved, but the slider tilts due to centrifugal force misalignment
Solution Approach 1:
The balance weight portion is designed with a counter eccentric direction arrangement to generate centrifugal force that opposes and balances the centrifugal force on the orbiting scroll. This counterbalancing mechanism prevents slider tilt while maintaining structural integrity, eliminating the need for excessive thickness in the connection part.
2Stability of the object's composition
If the upper end of the balance weight portion is positioned higher than the cylindrical portion to raise the center of action, then the alignment is improved, but the slider size increases
Solution Approach 1:
Instead of vertically stacking the balance weight portion above the cylindrical portion, the invention positions the balance weight portion in the counter eccentric direction at a radial distance from the center of rotation. This dimensional reconfiguration allows the center of action to be adjusted horizontally rather than vertically, maintaining compact slider height while achieving proper centrifugal force alignment.
3Stability of the object's composition
If the radius of the upper part of the balance weight portion is increased to raise the center of action, then the alignment is improved, but the centrifugal force becomes excessive and the slider size increases
Solution Approach 1:
The balance weight portion is designed with non-uniform mass distribution, concentrating mass at specific radial positions in the counter eccentric direction rather than uniformly increasing the radius. This localized mass placement optimizes the center of action position and centrifugal force magnitude, preventing excessive forces while achieving proper alignment.
4Reliability
If the slider is designed to rotate with cylindrical portion and rocking bearing parallel, then the oil film thickness is maximized, but the connection part must be thick for strength
Solution Approach 1:
The balance weight portion generates centrifugal force in the counter eccentric direction that balances the centrifugal force on the orbiting scroll. This counterbalancing prevents slider tilt during rotation, ensuring the cylindrical portion and rocking bearing remain parallel throughout the rotation cycle, thereby maintaining optimal oil film thickness without requiring excessive connection part thickness.
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 design effectively prevents biased contact and maintains reliability under high-oil temperature conditions, reducing material costs and size increments, thus enhancing the compressor's performance and efficiency.
Implementation Method 1
at least a part of the centrifugal force generated on the orbiting scroll is canceled by a centrifugal force generated on the balance weight portion when the slider rotates
Implementation Method 2
a center of action of an oil film reactive force generated between the rocking bearing and the outer peripheral surface of the cylindrical portion of the slider
Data Source
AI summary
A scroll compressor includes a slider including a cylindrical portion supported by a rocking bearing provided on an orbiting scroll so that it rotates freely, and a balance weight portion connected to the cylindrical portion. When a direction opposite to an eccentric direction of the orbiting scroll is a counter eccentric direction and a direction of a central axis of the rocking bearing is a Z-axis direction, the balance weight portion includes a main weight portion provided at a position distant from a center of rotation of the slider in the counter eccentric direction, and a counter-weight portion provided at a position spaced away from the orbiting scroll than a position of a center of the rocking bearing in the Z-axis direction and at a position distant from the center of rotation of the slider in the eccentric direction.