Two-stage evaporative refrigeration system provided with ejector

Abstract

The invention discloses a two-stage evaporative refrigeration system provided with an ejector. The two-stage evaporative refrigeration system provided with the ejector comprises a first-stage refrigeration pipeline, a second-stage refrigeration pipeline and a third-stage refrigeration pipeline, wherein the two ends of the first-stage refrigeration pipeline communicate with a compressor and a first gas-liquid separator correspondingly, and a first condenser is arranged on the first-stage refrigeration pipeline; the second-stage refrigeration pipeline comprises a first refrigeration sub-pipeline and a second refrigeration sub-pipeline which are arranged in parallel, the two ends of the first refrigeration sub-pipeline communicate with the first gas-liquid separator and a second gas-liquid separator correspondingly, and the two ends of the second refrigeration sub-pipeline communicate with the first gas-liquid separator and the compressor correspondingly; and the third-stage refrigeration pipeline comprises a first refrigeration branched pipeline and a second refrigeration branched pipeline which are arranged in parallel, the first refrigeration branched pipeline communicates with the second gas-liquid separator and the ejector, the second refrigeration branched pipeline communicates with the second gas-liquid separator and the compressor, and a second evaporator is arranged on the third-stage refrigeration pipeline. According to the two-stage evaporative refrigeration system provided with the ejector, part of expansion work is recovered, and thus energy efficiency is improved; the thickness of a liquid film is reduced, and thus condensation efficiency is improved; and the operating stability of the second evaporator is improved, and all heat exchanger components are regulated and controlled.

Description

technical field [0001] The invention relates to the technical field of refrigeration systems, in particular to a two-stage evaporative refrigeration system with an ejector. Background technique [0002] The vapor compression refrigeration system is mainly composed of four major components such as a compressor, a condenser, an evaporator, and an expansion device. These components are connected in a certain order through pipelines to form a closed refrigeration circuit. The refrigerant circulates among the four components, exchanges energy with the outside world, and achieves the purpose of cooling. [0003] In the traditional evaporative refrigeration system, the throttling device will generate expansion work during the working process, and the expansion work produced cannot be recovered, which affects the energy efficiency of the evaporative refrigeration system. [0004] In addition, during the condensation process, steam often condenses into condensate on the wall of the ...

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Problems solved by technology

[0003] In the traditional evaporative refrigeration system, the throttling device will generate expansion work during the working process, and the expansion work produced cannot be recovered, which affects the energy efficiency of the evaporative refrigeration system

[0004] In addition, during the condensation process, steam often condenses into condensate on the wall of the condenser and spreads into a liquid film, and the heat released by the condensation of steam must pass through the liquid film, but the thermal conductivity of the liquid film is poor, which seriously affects the flow of heat. Transfer, so that the condensation efficiency of the condenser is very low

[0005] If the inlet of the evaporator is a gas-liquid two-phase working fluid, it will cause the evaporator to vibrate during the working process, which will affect the safe use and life of the evaporator

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