Compressor Pressure Relief Device for Rapid Restart
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Solution Overview
Problem
Refrigeration systems face challenges in restarting compressors due to slow pressure balance between the air suction and exhaust sides, especially when throttling components are closed, leading to difficulties in achieving the required pressure difference for reliable compressor operation.
Innovation Solution
A compressor design incorporating a pressure relief device with a throttling mechanism that adjusts the through-flow area to balance pressures quickly, allowing for rapid pressure equalization between the air suction and exhaust sides, facilitating quicker compressor restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the throttling component is closed when the refrigeration system is shut down, then the pressure balance between the air suction side and air exhaust side can be maintained, but the pressure balance can only be achieved gradually through leakage from the clearance, prolonging the duration for balancing and making it difficult to meet the restart time requirement
Solution Approach 1:
The pressure relief device is pre-configured in the compressor to provide a dedicated pressure relief path. When the system is shut down, this pre-existing path allows rapid pressure equalization between the suction and exhaust sides without waiting for gradual leakage through clearances, thus meeting the restart time requirement while maintaining reliability
Solution Approach 2:
The pressure relief device acts as an intermediary mechanism that facilitates rapid pressure balance. It provides a controlled path for pressure equalization, mediating between the high-pressure exhaust side and low-pressure suction side, enabling quick restart without the delays caused by relying solely on clearance leakage
2Loss of time
If the pressure relief device has a large through-flow area, then the pressure balance can be achieved quickly, but the pressure distribution of the fluid may become unstable, affecting the reliability of the pressure relief device
Solution Approach 1:
The through-flow area of the pressure relief device is precisely controlled within the range of 0.05-0.5 times the cross-sectional area of the pressure relief channel. This parameter optimization ensures that pressure equalization occurs quickly enough for reliable restart, while maintaining stable pressure distribution and fluid flow characteristics throughout the process
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 significantly shortens the duration required for compressor restarts and improves the efficiency of refrigeration systems by ensuring rapid pressure balance, enhancing the reliability and effectiveness of the refrigeration process.
Implementation Method 1
limiting a circumferential through-flow area of the pressure relief device, so that a product of a perimeter of the pressure relief opening and a displacement of the pressure relief device is greater than zero and is less than or equal to 0.8 time an area of a cross section of the pressure relief channel, and fluid flowing from a high-pressure side to a low-pressure side is throttled
Data Source
AI summary
A compressor and a refrigeration system are provided. The compressor has a shell, an air cylinder assembly and a pressure relief device. The shell has a containing cavity. The air cylinder assembly is disposed in the containing cavity, and has an air suction cavity and a pressure relief channel. The pressure relief channel communicates with the air suction cavity and the containing cavity, and has a pressure relief opening. The pressure relief device is connected with the air cylinder assembly. The pressure relief device moves in the axis direction of the pressure relief channel, so as to open or close the pressure relief opening.