Compressor Lubrication Channel for Noise Reduction
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Solution Overview
Problem
Hermetically sealed reciprocating compressors face issues with lubricant distribution at high operating speeds, leading to increased noise and energy efficiency losses due to lubricant entering the suction muffler and mixing with coolant.
Innovation Solution
A compressor design featuring a lubricating device with a hole on its side surface, which directs lubricant laterally to moving parts, preventing it from hitting the upper casing and entering the suction muffler, while ensuring efficient lubrication and noise reduction through controlled lubricant ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates at high rpm values, then productivity increases, but the lubricant is ejected at high speed causing increased operational noise and energy efficiency losses
Solution Approach 1:
A lubricating device with a laterally positioned hole acts as an intermediary between the crankshaft and the upper casing. This intermediary structure redirects the lubricant flow path, allowing the lubricant to be delivered to moving parts while preventing direct high-speed impact against the upper casing, thereby reducing operational noise without compromising productivity
Solution Approach 2:
The hole is positioned on the lateral surface of the lubricating device rather than at the top, creating a localized change in the lubricant ejection direction. This local modification redirects the lubricant flow laterally to target specific moving parts while avoiding the upper casing area, thus eliminating noise generation at the problem location
2Reliability
If the lubricant is ejected at high speed to meet high rpm lubrication demands, then lubrication performance improves, but the lubricant scatters and enters the suction muffler mixing with coolant
Solution Approach 1:
The lateral positioning of the hole creates a localized ejection direction that targets moving parts directly. This localized modification to the lubricant delivery system ensures that lubrication performance is maintained through direct targeting while preventing the scattering effect that causes lubricant to enter the suction muffler and mix with coolant, thereby preserving energy efficiency
3Reliability
If the lubricant hits the upper section of the casing, then lubrication coverage is improved, but operational noise increases
Solution Approach 1:
The lubricating device with a laterally positioned hole serves as an intermediary structure that changes the lubricant delivery mechanism. Instead of allowing lubricant to hit the upper casing directly, the intermediary device redirects the flow laterally to reach moving parts through a different path, maintaining lubrication coverage while eliminating the noise-generating impact against the casing
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 solution effectively reduces operational noise and maintains energy efficiency by ensuring proper lubrication of moving parts without lubricant entering the coolant cycle, even at high rpm values.
Implementation Method 1
The lubricant is transferred towards the upper portions of the compressor by means of centrifugal forces and the channel provided inside the crankshaft
Data Source
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AI summary
The present invention relates to a compressor (1) of a cooling appliance, the compressor (1) comprising a crankshaft (2) and a cylinder block (3) which has a main bearing (4) for supporting the crankshaft (2) and a casing (5) which has a lower section (6) for collecting lubricant, the crankshaft (2) comprising a vertically extending shaft (7) which includes an integral bearing section (8) that is adapted for being guided into the main bearing (4), the shaft (7) comprising an integral lower tip section (9) that is adapted for being directly immersed into the lubricant inside the lower section (6), wherein shaft (7) comprises an integral crank (10) adapted for converting rotational movement in reciprocating movement and an axially upwardly continuous lubricant channel (11) that is formed so as to extend along and within the shaft (7) and adapted for conveying the lubricant from the lower tip section (9) towards the surface of the crank (10) via an outlet that is provided on the crank (10) upon rotation of the shaft (7).