Refrigeration System and Refrigerated Storage

Abstract

The present disclosure provides a refrigeration system and a refrigerated storage including the same, relating to the technical field of refrigeration equipment, and solving the technical problems of a high compressor pressure ratio, a reduced refrigeration coefficient and a high exhaust temperature in a refrigerated storage. The refrigeration system includes at least two sets of refrigerant compression devices, a refrigerant evaporation device and a flow path switching valve set, wherein all the refrigerant compression devices are fluidly connected to the flow path switching valve set; the flow path switching valve set is configured to control the refrigerant compression devices by switching the flow path switching valve set to supply a refrigerant to a refrigerant evaporation in an alternative manner or in series. According to the technical solution provided by the present disclosure, double-temperature high-efficiency refrigeration is achieved, and the energy efficiency of the refrigeration system is improved.

1 . A refrigeration system, comprising:
 at least two sets of refrigerant compression devices, wherein each of the refrigerant compression devices is configured to compress a refrigerant;   a refrigerant evaporation device; and   a flow path switching valve set, wherein all the refrigerant compression devices are fluidly connected to the flow path switching valve set, the flow path switching valve set is configured to cause the refrigerant compression devices by means of switching the flow path switching valve set to supply a refrigerant to the refrigerant evaporation device in an alternative manner or in series.   
     
     
         2 . The refrigeration system according to  claim 1 , wherein each set of refrigerant compressing devices has different compression ratios. 
     
     
         3 . The refrigeration system according to  claim 2 , wherein when all the refrigerant compression devices supply refrigerants in series, the compression ratio of the refrigerant compressing device located downstream is greater than the compression ratio of the refrigerant compressing device located upstream. 
     
     
         4 . The refrigeration system according to  claim 1 , further comprising:
 a cold supply switching valve set fluidly connected to the flow path switching valve set; and   at least two refrigerant evaporation devices, wherein the cold supply switching valve set is configured to cause the refrigerant by the cold supply switching valve set to flow towards at least one refrigerant evaporation device.   
     
     
         5 . The refrigeration system according to  claim 4 , wherein
 there are two sets of refrigerant compression devices, namely a first cold supply assembly and a second cold supply assembly;   an outlet pipeline of the first cold supply assembly is fluidly connected to the flow path switching valve set, and an inlet pipeline and an outlet pipeline of the second cold supply assembly are both fluidly connected to the flow path switching valve set to form a circulation loop;   the cold supply switching valve set comprises a first supply pipeline and a second supply pipe; one end of the first supply pipeline is fluidly connected to the flow path switching valve set and the other end of the first supply pipeline flows back to the first cold supply assembly after passing through an evaporator of one refrigerant evaporation device; and   one end of the second supply pipeline is fluidly connected to the cold supply switching valve set and the other end of the second supply pipeline is fluidly connected to the flow path switching valve set by an evaporator of the other refrigerant evaporation device.   
     
     
         6 . The refrigeration system according to  claim 5 , wherein the first cold supply assembly comprises a first compressor, and the second cold supply assembly comprises a second compressor and a condenser. 
     
     
         7 . The refrigeration system according to  claim 6 . wherein the flow path switching valve set comprises a cooler and a first throttle valve;
 an outlet pipeline of the first compressor communicates with the cooler;   an inlet pipeline and an outlet pipeline of the second compressor both communicate with the cooler; and   the first throttle valve is arranged on a pipeline between the condenser and the cooler.   
     
     
         8 . The refrigeration system according to  claim 7 , wherein the outlet pipeline of the first compressor extends below a liquid level in the cooler;
 two ends of the circulation loop are respectively connected to two positions on the cooler located above the liquid level in the cooler; and   the second supply pipeline and the first supply pipeline are respectively connected to two positions on the cooler located below the liquid level in the cooler.   
     
     
         9 . The refrigeration system according to  claim 7 , wherein the cold supply switching valve set further comprises a second throttle valve and a pump;
 the second throttle valve is arranged on the first supply pipeline; and   the pump is arranged on the second supply pipeline.   
     
     
         10 . The refrigeration system according to  claim 1 , wherein the refrigerant compressing device comprises:
 a compressor, comprising a first fluid outlet and a first fluid inlet;   a cooler, comprising a second fluid inlet, a second fluid outlet, a third fluid inlet and a fourth fluid outlet, the first fluid outlet communicating with the second fluid inlet, and the second fluid outlet communicating with the first fluid inlet; and   a second compressor, comprising a fourth fluid inlet and a fourth fluid outlet, the fourth fluid outlet communicating with the fourth fluid inlet, and the fourth fluid outlet communicating with the third fluid inlet.   
     
     
         11 . The refrigeration system according to  claim 10 , wherein the fluid path switching valve set comprises:
 a first throttle valve, arranged on a pipeline between the fourth fluid outlet and the third fluid inlet; and   a second throttle valve, arranged on a pipeline between the second fluid outlet and the first fluid inlet.   
     
     
         12 . The refrigeration system according to  claim 11 , wherein the refrigerant compressing device further comprises:
 a condenser, arranged between the first throttle valve and the second compressor.   
     
     
         13 . The refrigeration system according to  claim 11 , wherein the refrigerant evaporation device comprises:
 a first evaporator, comprising a liquid inlet and a gas outlet, the liquid inlet communicating with the second fluid outlet, and the gas outlet communicating with a fifth fluid inlet of the cooler; and   a second evaporator, arranged between the second throttle valve and the first fluid inlet.   
     
     
         14 . A refrigerated storage, comprising:
 a freezing storage;   a refrigeration storage; and   a refrigeration system comprising:
 at least two sets of refrigerant compression devices, wherein each of the refrigerant compression devices is configured to compress a refrigerant; 
 a refrigerant evaporation device; and 
 a flow path switching valve set, wherein all the refrigerant compression devices are fluidly connected to the flow path switching valve set, the flow path switching valve set is configured to cause the refrigerant compression devices by means of switching the flow path switching valve set to supply a refrigerant to the refrigerant to the refrigerant evaporation device in an alternative manner or in series; 
 wherein the refrigeration system is connected to the freezing storage and the refrigeration storage. 
   
     
     
         15 . The refrigerated storage according to  claim 14 , wherein the refrigerated storage has three refrigeration modes, namely, a refrigeration mode for the freezing storage, a dual-refrigeration mode for both of the freezing storage and the refrigeration storage, and a refrigeration mode for the refrigeration storage.