Multifunctional integrated condensing evaporator of cascade refrigeration system

Abstract

The invention discloses a multifunctional integrated condensing evaporator of a cascade refrigeration system. The multifunctional integrated condensing evaporator comprises a shell, wherein an upper tube plate and a rectifying layer are arranged in the shell from top to bottom, and an inner cavity of the shell is divided into an air return cavity, an upper heat exchange cavity and a lower heat exchange cavity from top to bottom; the condensing evaporator further comprises an air inlet pipe communicating with the lower heat exchange cavity and a liquid outlet pipe communicating with the upper heat exchange cavity; the condensing evaporator further comprises an evaporation side pipeline, the evaporation side pipeline comprises a heat exchange pipe assembly arranged in the upper heat exchangecavity, and the upper end of a heat exchange pipe of the heat exchange pipe assembly communicates with the air return cavity; the evaporation side pipeline further comprises a first heat exchange device used for heating liquid separated out of the air return cavity and a second heat exchange device used for supercooling liquid condensed out of the lower heat exchange cavity. The condensing evaporator has the advantages of being good in heat exchange performance, low in recharge amount, small in size and the like.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to an integrated condensation evaporator of a cascade refrigeration system. Background technique [0002] The cascade refrigeration system is widely used, and the condensing evaporator is the key heat exchange component. The condensing evaporator of the cascade refrigeration system mostly adopts the flooded or gravity liquid supply type, which has the advantage of obtaining better heat transfer performance and improving the overall operating efficiency of the system. [0003] The above scheme has the following disadvantages: 1. The condensing evaporator components are bulky and the charging volume of the working medium is large, which is not conducive to the integrated design of the cascade system; 2. The exhaust gas of the compressor is directly condensed, and the temperature difference between the two sides of the heat exchanger is too large ( The exhaust superheat degree o...

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Problems solved by technology

[0003] The above scheme has the following disadvantages: 1. The condensing evaporator components are bulky and the charging volume of the working fluid is large, which is not conducive to the integrated design of the cascade system; 2. The compressor exhaust is directly condensed, and the temperature difference between the two sides of the heat exchanger is too large ( The exhaust superheat degree on the low-temperature side is very high, the exhaust temperature is about 80°C, the medium temperature on the high-temperature side is -30°C, and the temperature difference between the two sides reaches more than 100°C at the inlet of the heat exchanger). Damage to the heat exchanger shortens the service life of the heat exchanger and affects the reliability of the entire cascade refrigeration system; 3. Liquid level control and oil return control are required for flooded and gravity liquid-fed condensing evaporators. The control of the expansion condensing evaporator is simpler and more reliable; 4. The condensate has no or little subcooling, which is not convenient for long-distance transportation

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