Compressor Bearing Wear Reduction via Eccentric Bushing
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Solution Overview
Problem
Existing compressors with scroll compression mechanisms experience severe abrasion in specific areas of the bearing due to uneven stress and excessive inertial force, leading to reduced operating efficiency and shorter compressor lifetime.
Innovation Solution
The compressor design includes a bushing seat with a positioning protrusion that is deflected at an angle relative to the straight line connected by the contact points between the orbiting and stationary scrolls, allowing the bearing to receive forces evenly and preventing excessive abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bushing is slidably sleeved on the eccentric shaft portion and the orbiting scroll slides synchronously with the bushing in the radial direction, then the orbiting scroll can maintain contact with the stationary scroll to form compression spaces, but when abnormally high pressure is generated in the compression spaces, the orbiting scroll and bushing cannot easily slide in the radial direction, resulting in the orbiting scroll being unable to smoothly orbit relative to the stationary scroll
Solution Approach 1:
The patent introduces a guide groove as an intermediary element between the orbiting scroll and the stationary scroll. This guide groove provides a predetermined radial movement path that guides the orbiting scroll during high-pressure conditions, ensuring smooth orbiting operation even when abnormal pressure prevents natural radial sliding. The guide groove acts as a mediator that facilitates the required motion under adverse pressure conditions.
2Ease of operation
If the bushing is slidably sleeved on the eccentric shaft portion, then the orbiting scroll can orbit relative to the stationary scroll, but the inertial force generated by the orbiting scroll while orbiting is transmitted to the eccentric shaft portion, causing uneven stress on the bearing and severe abrasion in specific areas
Solution Approach 1:
The guide groove serves as a mediator that redistributes the inertial forces generated during orbiting. By providing a constrained radial movement path, the guide groove prevents direct transmission of uneven inertial forces to the bearing, thereby reducing severe abrasion in specific bearing areas while maintaining smooth orbiting operation.
Solution Approach 2:
The patent modifies the stress distribution parameter by introducing the guide groove, which changes the force transmission path. This structural modification alters how inertial forces are distributed across the bearing, transforming concentrated uneven stress into more evenly distributed loads, thereby extending bearing lifetime while preserving orbiting functionality.
Data Source
AI summary
A compressor includes a housing, a motor disposed in the housing, a driving shaft connected to the motor, a first compression mechanism connected to the driving shaft, and a second compression mechanism. The second compression mechanism includes a stationary scroll and an orbiting scroll engaged with each other, a bushing seat positioned at an end portion of the driving shaft, a bushing, and a bearing. A main axis of the driving shaft passes through a positioning protrusion of the bushing seat, and the positioning protrusion is deflected at an angle relative to a straight line connected by a plurality of contact points between the orbiting scroll and the stationary scroll. The bushing is sleeved on the positioning protrusion, and a center line of the bushing is eccentric to the main axis. The bearing is sleeved on the bushing, and the orbiting scroll is sleeved on the bearing.