A multifunctional integrated condensing evaporator for a cascade refrigeration system

Abstract

The invention discloses a multifunctional integrated condensing evaporator of a cascading refrigeration system, which comprises a shell, and an upper tube plate and a rectifying layer are arranged in the shell from top to bottom, and the inner cavity of the shell is divided into top to bottom parts. The air return chamber, the upper heat exchange chamber and the lower heat exchange chamber; the condensing evaporator also includes an inlet pipe communicated with the lower heat exchange chamber and a liquid outlet pipe communicated with the upper heat exchange chamber; the condensing evaporator also includes Including the evaporation side pipeline, the evaporation side pipeline includes a heat exchange tube assembly arranged in the upper heat exchange chamber, the upper end of the heat exchange tube of the heat exchange tube assembly communicates with the return air chamber; the evaporation side pipe The circuit also includes a first heat exchange device for heating the liquid separated in the return air chamber and a second heat exchange device for subcooling the liquid condensed in the lower heat exchange chamber. The invention has the advantages of good heat exchange performance, low charging amount, small volume 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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