Lubricant separator with muffler
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current oil separators in HVAC&R systems are ineffective in maintaining adequate lubricant supply to compressors operating at variable speeds due to inadequate noise and vibration reduction, as existing mufflers are designed for fixed-speed compressors.
Innovation Solution
A lubricant separator with a muffler featuring a first and second perforated pipe, an absorption material layer, and a lubricant-permeable liner, which allows acoustic wave transmission and reduces pulsation across a wide range of frequencies, suitable for variable speed compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional muffler designed for fixed-speed compressors is used, then noise and vibration are reduced for fixed-speed operation, but the muffler is ineffective for variable-speed compressors across a wide range of frequencies
Solution Approach 1:
The muffler is divided into multiple chambers (first chamber, second chamber, third chamber) separated by partition walls with perforations. Each chamber can handle different frequency ranges of pulsations, allowing the muffler to effectively reduce noise and vibration across a wide frequency spectrum suitable for variable-speed compressors.
Solution Approach 2:
The invention adds a radial dimension to pulsation reduction by using radial flow paths through perforated pipes and partition walls. This multi-dimensional approach (axial and radial components) enables the muffler to handle varying pulsation frequencies more effectively than conventional single-dimension designs.
2Object-affected harmful factors
If absorption material is placed directly in the flow path to reduce pulsation, then noise reduction is improved, but pressure drop and flow resistance increase
Solution Approach 1:
Absorption material is placed only in specific locations (second chamber and third chamber) rather than throughout the entire flow path. The first chamber maintains a clear flow path with no absorption material, minimizing pressure drop while still achieving pulsation reduction in later chambers where the refrigerant flow has already been partially dampened.
Solution Approach 2:
Perforated pipes and partition walls act as intermediaries that allow acoustic wave transmission from the flow path to the absorption material. This indirect coupling enables pulsation reduction without requiring the absorption material to be directly in the high-velocity flow path, thereby minimizing pressure drop.
3Adaptability or versatility
If a multi-chamber muffler design is used to handle variable frequencies, then adaptability to variable speed compressors is improved, but device complexity increases
Solution Approach 1:
The partition walls serve multiple functions: they separate chambers for different frequency handling, provide structural support, and incorporate perforations that act as additional flow paths and acoustic filters. This multi-functionality reduces the need for separate components, thereby limiting the increase in complexity despite the multi-chamber design.
4Object-affected harmful factors
If absorption material layer is extended to fill more of the muffler volume, then pulsation attenuation is improved, but the footprint and size of the separator increase
Solution Approach 1:
Absorption material is strategically placed only in chambers where it provides maximum benefit (second and third chambers), while the first chamber maintains a clear flow path. This localized placement achieves effective pulsation attenuation without requiring the absorption material to fill the entire muffler volume, thereby limiting the increase in separator footprint.
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 compressor discharge pulsation and maintains lubricant supply to compressors operating at variable speeds, improving performance and compatibility with variable speed compressors while maintaining the same footprint as existing separators.
Implementation Method 1
a lubricant-permeable liner positioned radially between the second perforated pipe and the absorption material layer, the lubricant-permeable liner allowing for acoustic wave transmission from the second perforated pipe to the absorption material layer
Implementation Method 2
WO 2006/130131 A1 discloses a muffling apparatus containing absorbing material which contacts noise-creating pressure pulsations/waves and attenuates their energy into heat
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A lubricant separator includes a shell, a vapor inlet located at a first end of the shell to admit a flow of refrigerant and lubricant into the lubricant separator and a muffler positioned in the shell. The muffler includes a first perforated pipe extending along a longitudinal axis of the shell from the vapor inlet, a second perforated pipe radially spaced from the first perforated pipe, an absorption material layer positioned radially outboard of the second perforated pipe, and a lubricant-permeable liner positioned radially between the second perforated pipe and the absorption material layer. The lubricant-permeable liner allows for acoustic wave transmission from the second perforated pipe to the absorption material layer.