Load balancing method for two compressors
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Solution Overview
Problem
In refrigeration systems with two coaxially driven compressors, maintaining load balance is challenging due to the inability to directly monitor rotational speeds, leading to potential compressor damage from unbalanced loads.
Innovation Solution
A load balancing method that monitors parameters such as flow rates and temperatures at the suction and exhaust sides of the compressors, using pre-rotation guide vanes to adjust and control the operation of the compressors, and employs three monitoring methods: exhaust flow rate monitoring, suction flow rate monitoring, and suction temperature monitoring to determine and maintain balance.
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 compressors by directly monitoring rotational speeds
Solution Approach 1:
The patent uses pre-rotation guide vanes as intermediary components to adjust and control the load distribution between the two coaxially driven compressors. By regulating the flow of refrigerant into each compressor through these vanes, the system achieves load balance despite the compressors sharing the same rotational speed, thus resolving the contradiction between speed consistency and load balance detectability
Solution Approach 2:
The patent changes the operational parameters of the compressors by adjusting the pre-rotation guide vanes to control the refrigerant flow rate into each compressor. This parameter adjustment allows the system to maintain load balance between compressors while they operate at the same rotational speed, addressing the measurement precision issue
2Device complexity
If load balance is not monitored in coaxially driven compressors, then the system structure remains simple, but the compressors may be damaged by unbalanced loads
Solution Approach 1:
The patent implements a feedback mechanism by monitoring the flow rates of refrigerant into and out of each compressor, as well as the temperatures at the suction sides. This feedback information is used to determine load balance status and control the pre-rotation guide vanes, ensuring compressor safety while maintaining a relatively simple system structure
Solution Approach 2:
The control system automatically adjusts the pre-rotation guide vanes based on monitored parameters to maintain load balance, enabling the system to self-regulate and protect the compressors without requiring complex external monitoring or intervention
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. 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.