Scroll Compressor Eccentric Bush Swing Control
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Solution Overview
Problem
Conventional scroll compressors experience impact sound and noise due to rotational clearance between the shaft and eccentric bush, leading to vibration issues during refrigerant compression.
Innovation Solution
A scroll compressor design incorporating an adjusting mechanism with a drive pin and eccentric bush pressing portion to reduce the swing motion of the eccentric bush, preventing impact between the shaft and eccentric bush by applying counteracting forces during its swing motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotational clearance is formed between the shaft and eccentric bush to prevent damage during initial operation, then the orbiting scroll can be protected from liquid refrigerant compression, but impact sound and vibration occur during normal operation
Solution Approach 1:
The patent introduces an adjusting mechanism as an intermediary component between the shaft and eccentric bush. This mechanism includes an adjusting member that can be positioned at different locations to control the rotational clearance. The intermediary structure allows the system to maintain protective clearance while preventing harmful impact sounds and vibrations during normal operation.
Solution Approach 2:
The patent applies parameter changes by allowing the rotational clearance to be adjusted through the positioning of the adjusting member. By changing the clearance parameter at different operational stages (initial operation vs. normal operation), the system achieves both protection during initial operation and reduced vibration during normal operation. The adjusting mechanism enables dynamic control of this critical parameter.
2Reliability
If the eccentric bush is allowed to swing freely within rotational clearance, then damage prevention is achieved, but noise and vibration of the compressor deteriorate
Solution Approach 1:
The patent implements dynamics by providing an adjusting mechanism that can adapt the rotational clearance based on operational conditions. The adjusting member can be positioned to provide larger clearance during initial operation for protection, and smaller clearance during normal operation to reduce noise and vibration. This dynamic adjustment capability allows the system to optimize performance for different operational stages.
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 adjusting mechanism effectively reduces impact sound and vibration by controlling the swing motion of the eccentric bush, ensuring smooth operation and preventing damage from refrigerant compression.
Implementation Method 1
an adjusting mechanism configured to reduce the swing motion of the eccentric bush may be disposed between the shaft and the eccentric bush
Data Source
AI summary
A scroll compressor including a shaft configured to be rotated by a drive source; an eccentric bush having a recess portion into which the shaft is inserted, an eccentric portion eccentric to the shaft, and a balance weight for balancing a rotation; an orbiting scroll configured to be orbited by the eccentric portion; and a fixed scroll configured to be engaged with the orbiting scroll, and a rotational clearance is formed between an outer peripheral surface of the shaft and an inner peripheral surface of the recess portion, and the eccentric bush is formed to be capable of performing a swing motion relative to the shaft in a range of the rotational clearance based on a drive pin configured to connect the shaft and the eccentric bush, and an adjusting mechanism configured to reduce the swing motion of the eccentric bush is disposed between the shaft and the eccentric bush.