The invention provides a parallel compressors unit capable of self-adaptively operating at
low load. The parallel compressors unit comprises compressors, an oil separator, a condenser, a
liquid storage device, a filter, a visual
liquid lens, an expansion valve and an
evaporator, which are connected in sequence in an end-to-end manner. The output end of the oil separator is connected with the input ends of the compressors through a hot gas bypass
solenoid valve and a hot gas
bypass valve and connected with the input end of the
evaporator through an
oil supply solenoid valve, and the output end of the filter is connected with the input ends of the compressors through a superheat-removing
solenoid valve and a superheat-removing expansion valve. Meanwhile, the invention further provides an implementation method of the self-adaptive operation of the parallel compressors unit at
low load. According to the parallel compressors unit and the implementation method thereof, by improving the structure of the parallel compressors unit, the frequent start and stop of one compressor is avoided when the
cool storage load is reduced to be below the lowest regulation load, and the problems of temperature fluctuation and oil return of the
evaporator are avoided. Meanwhile, a manual
control mode is added, so that the parallel compressors unit is stable and saves energy.