Flooded central air conditioning system

Abstract

A flooded central air conditioning system includes a compressor, condenser, external oil separator, low pressure circulation barrel and spiral evaporator, refrigerant outlet of compressor connects to refrigerant inlet of external oil separator, whose refrigerant outlet connects to condenser inlet, whose outlet connects to refrigerant inlet of low pressure circulation barrel, whose refrigerant outlet connects to refrigerant inlet of spiral evaporator, whose refrigerant outlet connects to gas inlet of low pressure circulation barrel, whose gas outlet connects to refrigerant inlet of compressor. The present invention provides a flooded central air conditioning system, which owns advantages of energy saving and better refrigeration as ammonia refrigerant, safety and convenience as Freon refrigerant, has greatly improved the refrigeration efficient of refrigeration system using Freon as refrigerant. Integrated energy efficiency is significantly improved, and energy consumption greatly reduced. The central air conditioning system described owns pretty strong market competitiveness.

What is claimed is: 
     
         1 . A flooded central air conditioning system, wherein, the system comprises a compressor, a condenser, an external oil separator, a low pressure circulation barrel and a spiral evaporator, a refrigerant outlet of the compressor connects to a refrigerant inlet of the external oil separator, a refrigerant outlet of the external oil separator connects to an inlet of the condenser, an outlet of the condenser connects to a refrigerant inlet of the low pressure circulation barrel, a refrigerant outlet of the low pressure circulation barrel connects to a refrigerant inlet of the spiral evaporator, a refrigerant outlet of the spiral evaporator connects to a gas inlet of the low pressure circulation barrel, a gas outlet of the low pressure circulation barrel connects to a refrigerant inlet of the compressor; a refrigerant gas compressed by the compressor goes into the condenser for condensing after separated by the external oil separator, and after condensing, the refrigerant enters the low pressure circulation barrel and further enters the spiral evaporator for heat absorptions, and followed by the heated refrigerant going back to the low pressure circulation barrel from the spiral evaporator through the gas inlet, then the refrigerant gas in the the low pressure circulation barrel enters the compressor through the gas outlet, and forming a next circulation. 
     
     
         2 . The flooded central air conditioning system according to  claim 1 , wherein, the refrigerant is Freon. 
     
     
         3 . The flooded central air conditioning system according to  claim 2 , wherein, a position of the low pressure circulation barrel is arranged higher than that of the spiral evaporator, in order to make the refrigerant in the low pressure circulation barrel enter the spiral evaporator through the refrigerant outlet under gravity. 
     
     
         4 . The flooded central air conditioning system according to  claim 3 , wherein, the height difference between the low pressure circulation barrel and the spiral evaporator is 1.2-2.1 meters. 
     
     
         5 . The flooded central air conditioning system according to  claim 2 , wherein, the system further comprises an oil storage tank, applied to storing oil, and an oil outlet of the external oil separator connects to an inlet of the oil storage tank, while an oil outlet in the oil storage tank connects to an oil inlet of the compressor. 
     
     
         6 . The flooded central air conditioning system according to  claim 2 , wherein, the system further comprises a liquid storage tank, applied to storing the refrigerant, an inlet of the liquid storage tank connects to the outlet of the condenser, while an outlet of the liquid storage tank connects to the refrigerant inlet of the low pressure circulation barrel. 
     
     
         7 . The flooded central air conditioning system according to  claim 6 , wherein, the condenser comprises a high temperature condenser and a low temperature condenser, which are sequentially arranged, while the refrigerant from the refrigerant outlet of the external oil separator enters the liquid storage tank after getting condensed by the high temperature condenser and the low temperature condenser sequentially. 
     
     
         8 . The flooded central air conditioning system according to  claim 1 , wherein, the spiral evaporator comprises an inlet tube for refrigerant entry and an outlet tube for refrigerant exit, between the inlet tube and outlet tube, a spiral calandria is arranged side by side, both ends of the spiral calandria connect to the inlet tube and outlet tube respectively, wherein, a separation board is arranged in the inlet tube, applied to separating the refrigerant and the oil, which is arranged following the radius of the inlet tube and separating the inlet tube into an upper space and a lower space, which are interconnected. 
     
     
         9 . The flooded central air conditioning system according to  claim 8 , wherein, the inlet tube has a set of oil returning pipes arranged, and connects to the compressor through the oil returning pipes, an ejector pump is arranged in the oil returning pipes, and the oil deposited in the input tube enters the compressor following the oil returning pipes through the ejector pump. 
     
     
         10 . The flooded central air conditioning system according to  claim 8 , wherein, the compressor is arranged more than one, a circulation loop of each compressor is connected in parallel.