Two-stage compression refrigerating system

Abstract

The invention discloses a two-stage compression refrigerating system which is a system aiming at reducing losses in the throttling process and improving the system energy efficiency. The exhaust portof a function compressor is connected with the inlet of a condenser, the outlet of the condenser is connected with the inlet end of an expansion machine, the outlet end of the expansion machine is connected with the gas-liquid inlet of a receiver, the liquid outlet of the receiver is connected with the inlet of an evaporator through a restricting element, the outlet of the evaporator is connectedwith the air sucking opening of a booster compressor, the exhaust opening of the booster compressor is connected with the gas inlet of the receiver, the gas outlet of the receiver is connected with the air sucking opening of the function compressor, and the booster compressor is driven by the expansion machine. By means of the system, the expansion machine expands to act to drive the booster compressor to run, the losses of the throttling process are reduced, and the energy efficiency ratio of a refrigerating cycle is improved. Meanwhile, compressor liquid hammering caused by unbalanced liquidsupply amount and evaporation capacity in the evaporator is avoided, and the maintaining cost is reduced. In addition, the structure is simple, installation is convenient, and cost is low.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a two-stage compression refrigeration system with an expander. Background technique [0002] When lower temperature refrigeration is required, a single-stage compression or two-stage compression refrigeration cycle is usually used. This temperature requirement has the following disadvantages for the application of single-stage compression refrigeration cycle: the compressor works between large working pressure differences for a long time, which consumes a lot of power and wears the compressor to a large degree, resulting in the performance of the single-stage compression refrigeration cycle. The coefficient is relatively low and the maintenance cost is high. This temperature requirement has the following shortcomings for the dual-stage compression refrigeration cycle: the refrigeration system has a complex structure and high investment cost, so it is very necessary to opti...

AI Technical Summary

Problems solved by technology

This temperature requirement has the following disadvantages for the application of single-stage compression refrigeration cycle: the compressor works for a long time between a large working pressure difference, which consumes a lot of power and wears the compressor greatly, resulting in the performance of the single-stage compression refrigeration cycle. The coefficient is relatively low and the maintenance cost is high

This temperature requirement has the following disadvantages for the two-stage compression refrigeration cycle: the structure of the refrigeration system is complex and the input cost is high, so it is very necessary to optimize the two-stage compression refrigeration cycle system

Both the single-stage compression refrigeration system and the two-stage compression refrigeration system have the following disadvantages: the throttling process of the throttling and step-down element has a large loss, resulting in a large increase in the entropy of the entire refrigeration cycle and a low performance coefficient of the system.

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