Hermetic Compressor Oil Supply via Spiral Wing Shaft
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Solution Overview
Problem
Hermetic reciprocating compressors face limitations in reducing revolutions per minute (RPM) due to surface pressure from the shaft support, which restricts the rising speed of oil used for lubrication and cooling, necessitating higher RPM to effectively supply oil to components.
Innovation Solution
The compressor design incorporates a rotating shaft with a hollow portion and a fixation shaft featuring a spiral wing on its outer surface, allowing oil to be raised through the inner circumferential surface of the rotating shaft, reducing interference from surface pressure and enabling oil supply at lower RPM, while the spiral groove on the rotating shaft lubricates contact surfaces as oil descends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If oil is raised through the inner channel of the rotating shaft to lubricate components, then lubrication function is achieved, but surface pressure of the shaft support limits the rising speed of oil, thus limiting reduction in RPM of the rotating shaft
Solution Approach 1:
The rotating shaft is divided into two functional parts: a hollow portion for oil passage and a fixation shaft with spiral wing for active oil lifting. This segmentation allows the oil supply function to be separated from the structural support function, enabling effective oil delivery at lower RPM by using the spiral wing mechanism instead of relying solely on centrifugal force from high-speed rotation.
Solution Approach 2:
The spiral wing on the fixation shaft acts as an intermediary mechanism to transfer oil from the lower portion to the upper portion of the hermetic case. This spiral wing structure mediates the oil lifting process, allowing oil to be raised effectively without requiring high rotational speed, thus resolving the contradiction between low RPM operation and adequate oil supply speed.
2Use of energy by moving object
If the diameter of the rotating shaft is reduced to minimize centrifugal force, then energy consumption is reduced, but the structural strength and stability of the shaft may be compromised
Solution Approach 1:
The rotating shaft is segmented into a hollow portion and a fixation shaft with spiral wing. This segmentation allows the main rotating shaft to have a smaller diameter (reducing centrifugal force and energy consumption) while the fixation shaft with spiral wing provides the necessary structural support and oil lifting function, thus resolving the contradiction between reduced energy consumption and maintained structural strength.
3Use of energy by moving object
If oil is supplied at lower RPM, then energy consumption is reduced, but the oil supply efficiency may be insufficient to lubricate all components
Solution Approach 1:
The spiral wing on the fixation shaft serves as an intermediary mechanism that actively lifts oil against gravity and pressure differences. This intermediary structure ensures reliable oil supply to all components even at lower RPM, where centrifugal force alone would be insufficient, thus resolving the contradiction between energy consumption and oil supply efficiency.
Solution Approach 2:
The conventional reliance on centrifugal force (mechanical system dependent on high RPM) is replaced with a spiral wing lifting mechanism that uses geometric shape and rotational motion to actively pump oil. This substitution allows effective oil supply at lower speeds, reducing energy consumption while maintaining reliability.
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 allows for efficient oil supply and lubrication at lower RPM, reducing the diameter of the rotating shaft and minimizing centrifugal force required for oil rise, thereby enhancing operational efficiency and flexibility.
Implementation Method 1
a spiral member inserted into the hollow portion of the rotating shaft to rotate together with the rotating shaft to raise oil in the hermetic case
Implementation Method 2
a spiral groove communicating with the hollow portion and formed on an outer circumferential surface of the rotating shaft, wherein the oil retained in the hermetic case is raised through an inner circumferential surface of the rotating shaft, and the raised oil lubricates the rotating shaft while descending through the spiral groove
Data Source
AI summary
Disclosed herein is a compressor in which oil retained in a hermetic case may be raised through an inner circumferential surface of a rotating shaft. The rotating shaft is provided with a hollow portion, and a fixation shaft with a spiral wing is inserted into the hollow portion to raise oil. Also, a spiral groove is formed on an outer circumferential surface of the rotating shaft to cause the raised oil to descend and lubricate the outer circumferential surface of the rotating shaft, and the hollow portion and the spiral groove are connected to each other via a guide passage.