Scroll Compressor Oil Separator Back Pressure Valve
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Solution Overview
Problem
Conventional scroll compressors require separate apparatuses for oil circulation and back pressure control, leading to complexity and instability due to axial movement of the stationary scroll, which increases vibration and manufacturing difficulties.
Innovation Solution
A scroll compressor design incorporating an oil separator to separate coolant into oil and gas, with the oil being returned to a back pressure chamber through a return path and back pressure adjustment valve, ensuring lubrication and maintaining axial sealing by using a thrust plate and radial flow grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a back pressure hole is formed in the stationary scroll to control back pressure, then back pressure control is improved, but the stationary scroll axially moves toward the orbiting scroll causing structural instability and increased vibration
Solution Approach 1:
The patent divides the back pressure control function from the stationary scroll structure by introducing a separate back pressure adjustment valve located in the oil separator. This segmentation allows the stationary scroll to maintain its structural stability while the back pressure control function is performed by the adjustable valve, eliminating the axial movement and vibration caused by direct pressure control through the scroll structure.
2Reliability
If separate apparatuses are provided for oil circulation and back pressure control, then each function can be performed independently, but the apparatus becomes complicated and manufacturing becomes difficult
Solution Approach 1:
The patent merges the back pressure adjustment valve into the oil separator structure, creating an integrated component that performs both oil separation and back pressure control functions. This merging reduces the overall apparatus complexity and simplifies manufacturing while maintaining the reliability of both oil circulation and back pressure control functions through a unified design.
3Stress or pressure
If the stationary scroll is axially moved toward the orbiting scroll due to back pressure, then back pressure control is achieved, but vibration increases and manufacturing becomes very difficult
Solution Approach 1:
The patent introduces a back pressure adjustment valve as an intermediary component located in the oil separator, which mediates the back pressure control function without requiring axial movement of the stationary scroll. This intermediary mechanism achieves the desired back pressure adjustment while maintaining the stationary scroll's structural stability and position, significantly easing manufacturing requirements.
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 enables simultaneous oil circulation and back pressure control, stabilizing axial sealing and reducing vibration, while allowing for efficient lubrication and cost-effective manufacturing by separating oil from coolant and maintaining uniform back pressure.
Implementation Method 1
the coolant of the discharge chamber is separated into oil and gas in an oil separator
Data Source
AI summary
Provided is a scroll compressor having an improved function of oil circulation and back pressure control. The scroll compressor includes: a housing; a drive part for generating a rotational force; a drive shaft driven by the drive part; and a scroll compression part including a stationary scroll fixed regardless of rotation of the drive shaft and having a scroll wrap for compressing sucked fluid and a discharge port for supplying coolant into a discharge chamber, and an orbiting scroll orbited depending on rotation of the drive shaft and having a scroll wrap, characterized in that the coolant compressed by the scroll compression part is conveyed to the discharge chamber, the coolant of the discharge chamber is separated into oil and gas in an oil separator, the gas being discharged through a discharge hole and the oil being supplied into a back pressure chamber through a return path formed in the stationary scroll, and the oil is returned into a suction chamber through a back pressure adjustment valve.