Multistage compression system
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Solution Overview
Problem
In multistage compression systems, existing technologies face challenges in quickly and effectively controlling the distribution of oil between compressors, leading to uneven oil levels and inefficient operation.
Innovation Solution
The system connects an oil return pipe directly to the container of the low-stage compressor, allowing for rapid oil supply, and an oil discharge pipe is also connected to the container to manage excess oil, ensuring balanced oil levels and efficient operation by positioning these pipes strategically relative to the compression part and motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the oil return pipe is connected to the suction side of the accumulator through a small hole in the suction pipe, then the system structure is simple, but the oil return speed is slow and the amount of oil in the low-stage compressor cannot be quickly increased
Solution Approach 1:
The patent segments the oil return path by providing multiple oil return pipes with different connection points and characteristics. The first oil return pipe connects to the suction side of the accumulator through a small hole, while the second oil return pipe connects directly to the container of the low-stage compressor. This segmentation allows different portions of oil to return through different paths, achieving both structural simplicity and fast oil return speed.
Solution Approach 2:
The patent introduces the container of the low-stage compressor as an intermediary point for oil return. By connecting the second oil return pipe directly to this container, the system creates a direct pathway that bypasses the limitations of the accumulator's small hole, enabling rapid oil supply to where it is needed most without significantly complicating the overall system.
2Productivity
If the oil discharge pipe is connected to control oil amount rapidly, then the control speed is fast, but the system complexity increases
Solution Approach 1:
The patent merges the oil discharge function with the existing container structure of the low-stage compressor. The oil discharge pipe is connected to this container, utilizing the existing space and structure to enable rapid oil control. This merging approach allows for fast oil discharge control without adding separate complex discharge mechanisms or increasing overall system complexity significantly.
3Speed
If the oil return pipe connects to the container above the compression part and below the motor, then the oil supply speed to the oil reservoir is maximized, but the installation space requirements increase
Solution Approach 1:
The patent positions the oil return pipe connection point at a location where oil can immediately enter the container and flow down to the oil reservoir without obstruction. By pre-positioning the connection above the compression part and below the motor, the system ensures that oil gravity flow path is optimized from the moment oil enters the container, maximizing supply speed while utilizing the naturally available space in the compressor structure.
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 configuration enables quick response in oil return and discharge, effectively controlling the oil amount in the low-stage compressor, preventing oil level imbalances and enhancing system efficiency.
Implementation Method 1
The oil return pipe returns the oil discharged by the high-stage compressor or the oil in the high-stage compressor to the low-stage compressor
Implementation Method 2
oil return quickly responds and increases an amount of oil in the low-stage compressor easily
Data Source
AI summary
A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, an oil return pipe that returns the oil discharged by the high-stage compressor to the low-stage compressor, and an oil discharge pipe that discharges the oil in the low-stage compressor. The low-stage compressor includes a compression part that compresses the refrigerant, a motor that drives the compression part, and a container that houses the compression part and the motor. The container forms a high-pressure space storing compressed refrigerant. Inside of the oil return pipe and inside of the oil discharge pipe are connected to the high-pressure space.