A Three-Stage Jet Refrigeration System

Abstract

The invention discloses a three-stage injection type refrigeration system. The three-stage injection type refrigeration system comprises a condenser; the output end of the condenser is divided into three routes, one route is connected with the second stage injector, another route is connected with a pump, and the third route is sequentially connected with a throttle valve, an evaporator and the first stage injector; the output of a generator is divided into two routes, one route is connected with the first stage injector, the other route is connected with the third stage injector; and both the first stage injector and the third stage injector are connected with the second stage injector. The three-stage injection type refrigeration system has an energy-saving effect, effectively reduces the quantity of working gas required by the injectors, reduces the quantity of heat required by the generator, increases the entrainment ratio, reduces the volume of the injectors, increases the energy efficiency by about 5%, and achieves a greater pressure ratio. The three-stage injection type refrigeration system is simple in configuration, low in manufacturing cost, and compact in structure.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a three-stage injection refrigeration system. Background technique [0002] Ejection refrigeration is a refrigeration technology driven by thermal energy, which can make full use of industrial waste heat, solar heat and other low-grade heat sources. It consumes little mechanical energy, has simple equipment, reliable operation and low cost. Its working medium can be carbon dioxide, water, hydrocarbons and other green and environment-friendly natural substances. [0003] However, its disadvantages are that the ejector has a small compression ratio and a high cooling temperature; and its operation is affected by the back pressure, and the injection ratio is small. [0004] Patent Application No. 201210116545.X proposes "a self-cascading ejector refrigerator", which uses a mixed working fluid and two ejectors to achieve a larger pressure ratio, but the structure is complex, ...

AI Technical Summary

Problems solved by technology

But the use of economizer or subcooler still complicates the system

And its two-stage injectors are all gas injectors, which have little influence on the injection ratio and have limited improvement on the operating conditions of the injectors

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