Angled Bearing Housing Drain for Scroll Compressor Startup Lubrication
Solution Overview
Problem
Existing scroll compressors face inefficiencies due to lubricant accumulation in the bearing housing drain cavity, leading to unwanted drag and reduced compressor lifespan, particularly during startup when lubrication is insufficient.
Innovation Solution
Incorporating a bearing housing drain angled at up to 65 degrees within the housing drain cavity to control lubricant pooling and drainage, allowing for quicker lubrication of thrust bearings upon startup and reducing component failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing housing drain is positioned horizontally, then lubricant drainage is efficient during operation, but lubricant pooling is insufficient during startup
Solution Approach 1:
The bearing housing drain is angled at 10-65 degrees relative to horizontal to pre-position lubricant in the housing cavity before startup occurs. This preliminary lubricant positioning ensures immediate lubrication availability when the compressor starts, eliminating the delay that would otherwise occur while lubricant accumulates during operation.
2Reliability
If the bearing housing drain is angled steeply, then lubricant pools quickly for startup, but lubricant accumulation during operation becomes excessive
Solution Approach 1:
The bearing housing drain angle is optimized within a specific range (10-65 degrees) to balance two opposing requirements: steep enough to enable rapid lubricant pooling for reliable startup, but not so steep that excessive lubricant accumulates during operation causing harmful drag. This parameter optimization resolves the contradiction between startup reliability and operational efficiency.
3Productivity
If lubricant is drained efficiently during operation, then drag is reduced, but lubrication during startup is delayed
Solution Approach 1:
By angling the bearing housing drain, lubricant is pre-positioned in the housing cavity before startup. This preliminary action ensures that when the compressor starts, lubrication is immediately available without delay, while during operation the angled drain still allows efficient drainage to minimize drag.
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 angled bearing housing drain ensures efficient lubrication of the thrust bearing, extending compressor lifetime and reducing operational failures by forming a lubricant pool for quicker access during startup, thereby enhancing reliability and efficiency.
Implementation Method 1
The bearing housing drain is disposed at an angle, relative to a horizontal axis... allowing for quicker lubrication of thrust bearings upon startup
Implementation Method 2
Incorporating a bearing housing drain angled at up to 65 degrees within the housing drain cavity to control lubricant pooling and drainage
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A bearing housing drain in a scroll compressor and method for controlling lubrication of a thrust bearing in the scroll compressor are disclosed. The compressor includes a compressor housing; a non-orbiting scroll member and an orbiting scroll member; an orbiting scroll hub having an upper end and a lower end, the lower end being disposed at a vertical elevation that is lower than the upper end; a thrust bearing; a lubricant sump; a housing drain cavity disposed within the compressor housing and configured to receive lubricant from the lubricant sump and to deliver the lubricant to the thrust bearing; and a bearing housing drain fluidly connected to the housing drain cavity and the lubricant sump.