Oil Separator Float Structure for Pressure-Stable Oil Return
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Solution Overview
Problem
The existing oil separators in refrigeration cycles, such as those used in ultracold freezers, face issues with float damage due to high and low pressure changes, leading to potential oil entry into the float and loss of oil return functionality.
Innovation Solution
An oil separator design featuring a hollow float formed by welding multiple members, allowing vertical movement with an endpoint of the welded portion positioned above the oil surface, combined with a valve device that returns oil based on float movement, reduces the risk of oil entering the float and maintains buoyancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the float is positioned to detect high oil levels in the tank, then the oil return function is activated, but the float is exposed to high-pressure refrigerant that can damage it and cause oil to enter the float
Solution Approach 1:
The float is divided into multiple segments or chambers separated by internal partitions. This segmentation prevents oil from freely entering and accumulating within the float structure, maintaining buoyancy even if some oil penetration occurs. The segmented design also creates multiple sealed compartments that can better withstand pressure variations.
Solution Approach 2:
A protective barrier or intermediary structure is introduced between the high-pressure refrigerant environment and the float's internal cavity. This intermediary prevents direct contact between the refrigerant and the float's buoyancy-critical internal space, isolating the float from harmful pressure fluctuations while allowing it to detect oil level changes.
2Ease of operation
If the float moves vertically to detect oil level changes, then oil return control is achieved, but the float structure is vulnerable to pressure-induced damage
Solution Approach 1:
The float is divided into multiple segments or chambers separated by internal partitions. This segmentation prevents oil from freely entering and accumulating within the float structure, maintaining buoyancy even if some oil penetration occurs. The segmented design also creates multiple sealed compartments that can better withstand pressure variations.
Solution Approach 2:
The float structure incorporates pre-designed protective features such as reinforcement ribs, thickened walls, or pressure-distributing geometric patterns that are built in before the float encounters high-pressure conditions. These preemptive structural reinforcements cushion the float against pressure-induced deformation and damage during operation.
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 effectively prevents oil from entering the float, ensuring continuous oil return functionality and preventing float damage from pressure changes, thus maintaining efficient refrigerant circulation and preventing oil-related issues in the compressor.
Implementation Method 1
a hollow float formed by welding a plurality of members and configured to be vertically movable according to a change of an oil level inside the tank
Data Source
AI summary
The oil separator 11 separates oil in the refrigerant discharged from the compressor 4 and returns the oil back to the compressor 4. And includes a tank 21 into which refrigerant discharged from the compressor 4 flows, a float 24 whose inside is hollow formed by welding a plurality of members and made vertically movable according to the changes in the oil surface 20 inside the tank 21, and a needle valve 29 that returns oil inside the tank 21 to the compressor 4 according to the vertical movement of the float 24. The float 24 is provided such that the end point 24E of the welded portion comes above the oil surface 20.