Water cooling heat pump type multiple air-conditioning unit

Abstract

A water-cooling heat pump typed multi-connected air-conditioning unit comprises a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor electronic expansion valve, a liquid receiver, a liquid valve, a gas valve, a plurality of indoor electronic expansion valves, a plurality of indoor heat exchangers and a gas-liquid separator which are connected through pipes. The multi-connected air-conditioning unit is characterized in that the outdoor heat exchanger is a water-cooling heat exchanger; the pump unit comprises an oil-return device in the outdoor heat exchanger, and a subcooler. The outdoor heat exchanger of the invention adopts a water-cooled heat exchanger, which significantly increases the energy efficiency ratio of the pump unit, reduces the external dimension of the pump unit. The oil-return device in the outdoor heat exchanger ensures the pump unit to have good oil-return characteristics in thermo-producing conditions, thus realizing the safe and reliable running of the pump unit. The subcooler can prevent instantaneous vaporization of the refrigerant during long-range transmission, thus maintaining the stable and reliable economic running of the pump unit under high head drop of a long connecting pipe.

Description

technical field [0001] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to a water-cooled heat pump multi-connected air conditioner unit which has good oil return characteristics under heating conditions and can realize remote delivery of refrigerants, specifically a water-cooled Heat pump type multi-connected air conditioning unit. Background technique [0002] The multi-connected air conditioner means that one outdoor unit can deliver refrigerant to several indoor units through pipelines. By controlling the refrigerant circulation volume of the compressor and the refrigerant flow rate entering each heat exchanger in the room, the indoor cooling system can be satisfied in real time. heat load requirements of the unit. Since the air-cooled heat pump multi-connected air conditioner was born in Japan in 1982, the technology has developed rapidly, and it has become one of the important forms of central air-conditioni...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design a high energy efficiency ratio for the existing air-cooled heat pump multi-connected air-conditioning units that have poor oil return characteristics under heating conditions, long-connected pipes, and difficult temperature adjustment under high drop conditions. Compact structure, good oil return characteristics under heating conditions, stable and reliable water-cooled heat pump multi-connected air conditioning unit under long-connected pipes and high drop conditions

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