Variable flow hot gas defrosting mechanism of small-sized refrigerating system

Abstract

The invention discloses a variable flow hot gas defrosting mechanism of a small-sized refrigerating system. The variable flow hot gas defrosting mechanism of the small-sized refrigerating system comprises a compressor; three or more parallel one-way electromagnetic valves are connected to an outlet of the compressor through gas pipes; one ends of the three or more parallel one-way electromagneticvalves are respectively connected with an evaporator; without a throttling device, heat of a medium is directly transmitted to snow and frost on the surface of the evaporator so that the snow and frost are melted; the medium finishing heat exchanging returns to the compressor via a gas return pipeline; and this cycle is repeated (like solid lines in a drawing, not the dotted line part). Accordingto the variable flow hot gas defrosting mechanism of the small-sized refrigerating system, by using the one-way electromagnetic valve combination, the circulating hot gas defrosting efficiency is high; and moreover, the flow can be adjusted according to defrosting gas return pressure change; and meanwhile, electromagnetic valve control and structure are simple, mature and stable.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a variable flow hot gas defrosting mechanism for a small refrigeration system. Background technique [0002] In the refrigeration system, the refrigerant undergoes continuous refrigeration cycles, and continuously exchanges heat with the air on the surface of the evaporator. The low temperature causes frosting, which hinders the conduction and distribution of cold energy in the refrigeration evaporator (pipe), and affects the cooling effect. When the thickness of the frost layer (ice layer) on the surface of the evaporator reaches a certain level, the refrigeration efficiency even drops below 10%, resulting in a large waste of electric energy and shortening the service life of the refrigeration system. Therefore, it is necessary to carry out the defrosting operation of the cold storage in an appropriate cycle. The purpose of defrosting is to improve the cooling efficiency o...

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Problems solved by technology

The electric heating defrosting method adopts the electric heating method, the efficiency is very low, and there is a danger of electric leakage in the electric heating; the steering valve used in the hot gas defrosting of the steering valve has a complex structure, the flow rate is fixed and cannot be adjusted, and the response is not fast enough, which increases maintenance equipment risks of

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