Special water cooled chiller unit at tail end of capillary network

The utility model discloses a special water cooled chiller unit at the tail end of a capillary network, which comprises a semi-closed screw compressor. An outlet of the semi-closed screw compressor is communicated with an inlet of a shell-tube condenser, an outlet of a shell-tube condenser is communicated with a flooded evaporator through a drying filter drum and an electronic expansion valve, an outlet of the flooded evaporator is communicated with an inlet of the compressor, the shell-tube condenser is provided with an internal oil separator, an outlet of the oil separator is communicated with an inlet of a powerless oil return device, an outlet of an unpowered oil return device is connected in series to a pipeline between the inlet of the compressor and the outlet of the flooded evaporator, an ejector is arranged in the unpowered oil return device, and an ejection port of the ejector is communicated with an oil outlet of an oil storage tank of the flooded evaporator through a ball valve. The special water