Vehicle Rotary Compressor Oil Separation With Centrifugal Staging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary compressors face challenges in efficiently separating oil from compressed gas due to the high-speed rotation and turbulent flow, leading to reduced efficiency, wear, and potential contamination of downstream equipment, especially in vehicle applications where space is constrained.
Innovation Solution
A two-stage oil separation system is integrated into the compressor, utilizing a centrifugal separator followed by a flow deceleration separator to leverage oil droplet inertia and coalescence, ensuring effective separation of oil particles from the compressed gas stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage filtration system is used, then the device complexity is reduced, but the oil separation efficiency deteriorates
Solution Approach 1:
The filtration system is divided into two distinct stages: a centrifugal separator for initial oil-gas separation and a flow deceleration separator for fine particle removal. This segmentation allows each stage to specialize in removing different sizes of oil particles, achieving high overall separation efficiency while keeping each individual component relatively simple in design
2Reliability
If a multi-stage filtration process is used, then the oil separation efficiency is improved, but the device complexity increases
Solution Approach 1:
The centrifugal separator and flow deceleration separator are merged into a single integrated separation unit with a unified housing and coordinated internal structure. This merging approach allows the multi-stage filtration process to be implemented while minimizing overall device complexity through shared components and streamlined flow paths
3Reliability
If a sufficiently large oil sump housing is used to calm and stabilize the air-oil mixture, then the oil separation efficiency is improved, but the volume occupied increases
Solution Approach 1:
The separation process is segmented into two distinct stages performed in sequence within a compact arrangement. The centrifugal separator handles bulk oil removal, while the flow deceleration separator captures fine particles. This segmentation eliminates the need for a large-volume single-stage housing, achieving effective separation in a reduced space
4Productivity
If the compressor operates at high speed, then the productivity is improved, but the oil entrainment in compressed gas increases
Solution Approach 1:
The centrifugal separator performs preliminary action by removing the majority of oil particles from the compressed gas stream before it enters the flow deceleration separator. This preliminary separation reduces the oil load on the second stage, enabling effective fine particle removal even at high compression speeds without requiring excessive deceleration time
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 system enhances oil removal efficiency, maintaining compressor performance and longevity by reducing oil contamination and ensuring a cleaner output, suitable for compact vehicle applications.
Implementation Method 1
the first separator comprises a centrifugal separator and is configured to separate oil using centrifugal forces in a first stage
Implementation Method 2
the second separator comprises a flow deceleration separator for further separating or capturing oil particles from the compressed gas stream in a second stage
Implementation Method 3
The present invention is based on the basic idea to leverage the mass inertia of the oil droplets and aerosol
Implementation Method 4
as well as the tendency of smaller droplets to combine into larger particles
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Rotary compressor (100), for an air treatment system of a vehicle, comprising a compression cell (2) for producing compressed gas streams, and a separation unit (200) for separating oil from the compressed gas streams, wherein the separation unit is in fluid communication with the compression cell and is configured to separate oil from the compressed gas stream exiting an outlet (9) of the compression cell, and wherein the separation unit comprises a first separator (204), in particular a centrifugal separator, and a second separator (202), in particular a deceleration separator, wherein the second separator is positioned downstream of the first separator in the direction of the compressed gas stream.