Scroll compressor
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Solution Overview
Problem
In scroll compressors, it is challenging to ensure adequate oil supply to the thrust sliding portion where the communication channel with the peripheral compression chamber is formed, particularly when a back-pressure space is present, leading to inadequate lubrication and reduced reliability.
Innovation Solution
The design incorporates a second oil channel that communicates with the back-pressure space, positioned in the vicinity of the communication channel, to collect and supply oil to the thrust sliding portion, ensuring comprehensive lubrication across the contact area between the fixed and movable scrolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a communication channel is formed in the thrust sliding portion to communicate the back-pressure space with the peripheral compression chamber, then the back-pressure space can be controlled at intermediate pressure, but oil supply to the thrust sliding portion becomes inadequate
Solution Approach 1:
The thrust sliding portion is divided into multiple regions: a first region with a first oil channel supplied from high-pressure space, and a second region with a second oil channel communicating with the back-pressure space. This segmentation allows each region to be lubricated independently through dedicated oil channels, resolving the conflict between pressure control and oil supply adequacy.
Solution Approach 2:
Different oil supply strategies are applied to different regions of the thrust sliding portion. The first region receives oil from the high-pressure space through the first oil channel, while the second region receives oil from the back-pressure space through the second oil channel. This local differentiation ensures adequate lubrication in each region according to its specific requirements.
2Reliability
If an oil channel is formed across the entire circumference of the fixed scroll, then adequate lubrication is ensured, but it becomes difficult to form when a back-pressure space with communication channel is present
Solution Approach 1:
Instead of a single continuous oil channel across the entire circumference, the oil supply system is segmented into multiple discrete oil channels (first oil channel and second oil channel) positioned at specific angular regions. This segmentation simplifies the configuration by eliminating the need for a continuous channel while ensuring adequate lubrication coverage.
Solution Approach 2:
Oil channels are positioned at specific angular regions rather than uniformly across the entire circumference. The first oil channel is positioned in a first angular region and the second oil channel in a second angular region, providing localized lubrication where most needed while reducing overall structural complexity.
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 solution enhances the reliability of the scroll compressor by ensuring consistent oil supply to the entire contact area, even when a back-pressure space is formed, thereby improving the compressor's operational performance and longevity.
Implementation Method 1
Oil is supplied to the first oil channel from a high-pressure space that communicates with the compression chamber at high pressure and retained in the first oil channel
Implementation Method 2
The communication channel communicates with the compression chamber, and communicates with the communication hole for at least a prescribed period, allowing the pressure of the back-pressure space to become a desired intermediate pressure
Data Source
AI summary
A scroll compressor includes fixed and movable scrolls, and a drive part. The fixed scroll has a fixed-side end plate, a fixed-side lap, and a thrust sliding portion surrounding the first lap. The movable scroll has a movable-side end plate and a movable-side lap. The drive part revolves the movable scroll so that refrigerant in a compression chamber formed by the fixed-side lap and movable-side lap is compressed. A back-pressure space which communicates with the compression chamber for at least a prescribed period in a revolution cycle is formed at the back face side of the movable scroll. A first oil channel supplied with oil from a space is formed in a first angle region of the fixed-side end plate. A communication channel formed in a second angle region communicates with the compression chamber. A second oil channel communicating with the back-pressure space is formed in the second angle region.