Carbon dioxide refrigerator refrigeration system

Abstract

The invention discloses a carbon dioxide refrigerator refrigeration system. The carbon dioxide refrigerator refrigeration system comprises an integral expansion-compression machine; an exhaust port of a second-grade cylinder of a compressor is connected with an inlet of a gas cooler; an intake port of a first-grade cylinder of the compressor is connected with an outlet of an evaporator; and a refrigerant compressed by the first-grade cylinder of the compressor is discharged into a compressor shell, and enters the second-grade cylinder of the compressor by an air sucking channel of the second-grade cylinder of the compressor. An inlet of an expander is connected with an outlet of the gas cooler; a refrigerant in an outlet of the expander is divided into two ways; most refrigerant passes through one of three sets of electromagnetic valve and capillary pipe combinations; and the other part of few refrigerant passes through a hand valve and an electronic expansion valve to connect with a nozzle formed in the second-grade cylinder of the compressor. The carbon dioxide refrigerator refrigeration system can improve the refrigeration performance by adopting the modes of the integral expansion-compression machine, two grades of compression of middle spraying liquid for cooling and three sets of capillary pipes with different sizes.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a refrigeration system of a carbon dioxide refrigerator. Background technique [0002] Refrigerators are one of the most commonly used household appliances, and because household refrigerators work around the clock, the energy consumption of refrigerators accounts for a relatively large proportion of household electricity consumption, which makes the energy-saving problem of refrigerators extremely prominent. With the improvement of energy efficiency standards for refrigerators, and in order to reduce the energy consumption of refrigerators, the development of related energy-saving technologies in the field of refrigerators has been a research topic that has been widely concerned at home and abroad. Meanwhile, in the refrigerator industry, research on alternatives to HCFCs and HCFCs has been ongoing. Although the currently widely used alternative working fluids...

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects in the prior art, the purpose of the present invention is to provide a carbon dioxide refrigerator refrigeration system, which can solve the problem of low energy efficiency of carbon dioxide refrigerators, excessive throttling loss, and dryness of the two-phase working medium after throttling. High temperature, small cooling capacity and energy efficiency decrease with the change of ambient temperature

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