Scroll Compressor Pin Coupling Reduces Vibration
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Solution Overview
Problem
Scroll compressors face issues with vibration and noise due to the inclination of the orbiting scroll caused by the application of refrigerant repulsive force and reaction force at different points, leading to reduced disk strength and refrigerant leakage when the rotation shaft penetrates the disk.
Innovation Solution
A scroll compressor design where the rotation shaft and orbiting scroll are coupled on the same surface, with a pin portion and bush configuration that applies forces at the same point, reducing disk strength loss and refrigerant leakage by minimizing the shaft insertion hole diameter and using an eccentric bearing to prevent rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotation shaft penetrates the disk of the orbiting scroll to transmit torque, then the orbiting scroll can be driven to orbit, but the disk strength is reduced and refrigerant leakage occurs
Solution Approach 1:
The patent introduces an intermediary coupling mechanism consisting of a coupling member on the rotation shaft and a corresponding coupling structure on the orbiting scroll. This intermediary transmits torque without requiring the rotation shaft to penetrate the disk, thereby maintaining disk strength while achieving power transmission.
Solution Approach 2:
The torque transmission function is segmented into separate components: the rotation shaft with its coupling member and the orbiting scroll with its coupling structure. This segmentation allows each component to perform its specific function optimally without compromising the integrity of the disk.
2Productivity
If forces are applied at different points (repulsive force on wrap, reaction force on opposite side), then compression function is achieved, but the orbiting scroll inclines causing vibration and noise
Solution Approach 1:
The patent employs asymmetric force application through the coupling mechanism, where the reaction force is directed through the coupling member to align with the application point of the repulsive force. This asymmetric arrangement balances the forces on the orbiting scroll, preventing inclination and reducing vibration and noise.
3Power
If the shaft insertion hole diameter is increased to accommodate the rotation shaft, then torque transmission is improved, but disk strength is further reduced and refrigerant leakage increases
Solution Approach 1:
The coupling member acts as an intermediary that transmits torque through a smaller interface, eliminating the need for a large shaft insertion hole. This maintains the integrity of the disk and prevents refrigerant leakage while still achieving effective torque transmission.
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 minimizes disk strength reduction and refrigerant leakage while maintaining effective compression ratios, improving the overall operational efficiency and reducing noise and vibration.
Implementation Method 1
a pin portion and bush configuration that applies forces at the same point, reducing disk strength loss and refrigerant leakage by minimizing the shaft insertion hole diameter and using an eccentric bearing to prevent rotation
Data Source
AI summary
A scroll compressor is provided that may include a fixed scroll having a fixed wrap, an orbiting scroll engaged with the fixed wrap to define a compression chamber, a rotation shaft having a shaft portion eccentrically located with respect to the orbiting scroll, a pin portion located at an end of the shaft portion and having a diameter smaller than a diameter of the shaft portion, and a bearing located at an end of the pin portion, and a drive that drives the rotation shaft. The pin portion may be inserted through one of the fixed scroll or the orbiting scroll, and the orbiting scroll may be rotatably coupled to the bearing.