Active redundancy air conditioning unit and control method

Abstract

The active redundancy air conditioning unit comprises a controller and a plurality of sets of independent refrigeration circulation loops, each set of refrigeration circulation loop at least comprises a variable frequency compressor, and the active redundancy air conditioning unit further comprises a plurality of frequency converters controlling frequency changes of the compressors respectively. The input end of each frequency converter is connected with the controller through a first intermediate relay, the output end of each frequency converter is connected with the compressor, a second intermediate relay is further connected between the input end of each first intermediate relay and the input end of the compressor in parallel, and the controller controls opening and closing of the first intermediate relays and the second intermediate relays. And when any refrigeration circulation loop breaks down, the second intermediate relay is disconnected, the first intermediate relay is closed, and the compressor operates in the frequency conversion mode under the control of the frequency converter. The invention further provides a control method of the active redundancy air conditioning unit.

Description

technical field [0001] The invention relates to the technical field of air-conditioning products, in particular to an active redundant air-conditioning unit and a control method. Background technique [0002] With the development of rail vehicle technology, EMUs have increasingly become the first choice for people to travel due to their advantages of high speed, speed and comfort. In order to improve the ride comfort, EMUs and other rail vehicles are equipped with on-board air-conditioning units. In the prior art, common on-board air-conditioning units include multiple compressors, and each compressor represents an independent refrigeration cycle. The fixed-frequency compressor has high reliability. When one set of the refrigeration cycle fails, the refrigeration output is reduced, which is equivalent to the operation of the air-conditioning unit in the degraded mode, and the comfort in the car is affected; another technical solution in the prior art , Equipped with frequen...

AI Technical Summary

Problems solved by technology

In order to improve ride comfort, EMUs and other rail vehicles are equipped with vehicle-mounted air-conditioning units. In the prior art, common vehicle-mounted air-conditioning units include multiple compressors, and each compressor represents an independent refrigeration cycle. The fixed-frequency compressor has high reliability. When one of the refrigeration cycle circuits fails, the refrigeration output is reduced, which is equivalent to the air conditioner unit running in a degraded mode, and the comfort in the car is affected; another technical solution in the prior art , configure frequency conversion air conditioning units for rail vehicles, each unit contains multiple sets of mutually independent refrigeration cycle circuits, each set of refrigeration circuits includes a frequency conversion compressor, which can achieve multi-stage adjustment, when one set of refrigeration cycle circuits fails, In order to ensure the cooling output, the compressors in the other circuits will increase the frequency to run, which can take into account the cooling output before the failure, and ensure that the cooling output remains unchanged, thereby ensuring comfort. However, there are many electrical components in the inverter air conditioner, and there are many fault points

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