Explosion-proof control method of multi-connected air conditioning unit at runtime

Abstract

The invention discloses an explosion-proof control method of a multi-connected air conditioning unit at runtime. The method comprises the following steps: a, when the unit is turned off, additionally arranging a first air pressure balance tube (3) with a mechanical high-pressure switch valve (8) between an outdoor heat exchanger (1) and a gas-liquid separator (2) of each outdoor unit module, and arranging a high-pressure switch at the outlet end of an oil separator (9); b, running the unit; c, stopping the whole unit by virtue of a master controller of an air conditioner when the pressure value P0 of the outlet end of the oil separator (9) of the outdoor unit module is greater than or equal to a warning value Pb; d, opening the mechanical high-pressure switch valve (8) of the outdoor unitmodule when the pressure value Pt of the outdoor heat exchanger (1) of the outdoor unit module is greater than or equal to a zero bound pressure value Pa. The control method can be used for avoiding the coil burst of the outdoor heat exchanger.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to an explosion-proof control method for the multi-connected air-conditioning unit in operation. Background technique [0002] The multi-connected air conditioner unit in the prior art includes a plurality of outdoor unit modules connected in parallel, a plurality of indoor unit modules, and two refrigerant circulation main pipes connecting each indoor unit module and each outdoor unit module, and the plurality of outdoor unit modules are connected in parallel, parallel The last outdoor unit module communicates with the parallel connected indoor unit module through two refrigerant circulation main pipes. [0003] Each outdoor unit module includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode, evaporator in heating mode), throttling device, liquid receiver and gas-liquid separator The outlet of the compressor is conne...

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Problems solved by technology

[0004] Since the multiple outdoor unit modules of the multi-connected air conditioner unit are operated in parallel, after long-term operation, it is inevitable that the refrigerant distribution of each module will be uneven, that is, some outdoor unit modules have more refrigerant, some have less refrigerant, and some outdoor unit modules have less refrigerant. When the temperature of the outdoor unit module with more refrigerants rises, its air pressure will also increase sharply. When the pressure value of the outdoor unit module exceeds the pressure limit of each component of the module, the weak area in the module will burst; The coil of the outdoor heat exchanger of the outdoor unit module is made very thin for heat exchange, so this position is a weak area that is extremely easy to burst, and once the coil of the outdoor heat exchanger bursts, the refrigerant will leak , pollute the environment, cause large economic losses, and even cause safety accidents when they burst, and also need to repair or replace the outdoor heat exchanger, which is very troublesome

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