Coaxial Compressor Load Balancing Using Flow Rate Monitoring
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Solution Overview
Problem
In refrigeration systems using two coaxially driven compressors, it is challenging to determine load balance directly by monitoring rotational speeds, as the compressors maintain constant rotational speeds due to coaxial driving, preventing the detection of load imbalances.
Innovation Solution
A load balancing method that involves obtaining parameters such as flow rates and temperatures, determining balance by calculating deviation values, and controlling start/stop states of the compressors to maintain balance, using pre-rotation guide vanes to regulate refrigerant flow and adjust compressor operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two compressors are driven coaxially by the same driving device, then the rotational speeds of the two compressors are constantly the same, but it becomes impossible to determine whether there is load balance between the two compressors by directly monitoring rotational speeds
Solution Approach 1:
The patent introduces pre-rotation guide vanes as intermediary components that can be independently adjusted for each compressor. These vanes serve as mediators to create detectable flow rate differences between the two compressors, enabling load balance monitoring without disrupting the coaxial driving arrangement and rotational speed consistency.
Solution Approach 2:
The patent changes the monitoring parameter from rotational speed (which is identical for both compressors) to flow rate parameters. By measuring flow rates at the suction or exhaust sides of the compressors and calculating deviation values, the system can detect load balance status despite the compressors rotating at the same speed.
2Ease of operation
If pre-rotation guide vanes are used to regulate refrigerant flow, then flow rate control is achieved, but load imbalance between compressors may occur
Solution Approach 1:
The patent implements a feedback control mechanism where flow rate deviation values are continuously calculated and monitored. When an imbalance is detected (deviation exceeds threshold), the system responds by adjusting the pre-rotation guide vanes or controlling compressor start/stop states to restore balance, creating a closed-loop control system that maintains reliability while enabling flow rate regulation.
Data Source
AI summary
A load balancing method for two compressors. The two compressors are used in a refrigeration system and are driven coaxially by the same driving device. The method comprises the steps of obtaining parameters, determining balance, and controlling start/stop states. The parameters in the step of obtaining parameters are parameters related to the two compressors, such as a compressor suction side flow rate, or exhaust side flow rate, or suction side temperature; the step of determining balance comprises determining, on the basis of the obtained parameters related to the two compressors, whether load is balanced between the two compressors; the step of controlling start/top states comprises controlling the start/stop states of the two compressors according to whether the load is balanced. The method can monitor the load balance state of two compressors that are coaxially driven, thereby effectively avoiding failure of the refrigeration system caused by unbalanced loads of the compressors.