Evaporator system and evaporator flow control method

Abstract

The invention relates to the technical field of refrigeration equipment and discloses an evaporator system and an evaporator flow control method. The system comprises an evaporator and flow control valves, wherein the evaporator comprises a plurality of return circuits, and an inlet of each return circuit is connected with one flow control valve which is used for controlling the flow of a refrigerant which enters the return circuit in accordance with a comparative result of the degree of superheat of a gaseous refrigerant in an outlet of the return circuit and the target degree of superheat of the return circuit. The evaporator system can be used for guaranteeing the heat transfer capability of the evaporator to be fully performed in various working conditions, and the situation that a compressor returns gas with liquid or is severely superheated is avoided, thereby improving the reliability of the compressor.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to an evaporator system and an evaporator flow control method. Background technique [0002] The evaporator is a very important part of the refrigeration system. The low-temperature condensed liquid passes through the evaporator, exchanges heat with the outside air, vaporizes and absorbs heat, and achieves the effect of refrigeration. [0003] Such as figure 1 Shown is a schematic diagram of a typical air-conditioning and refrigeration system in the prior art. [0004] The refrigeration system includes: a compressor 1 , an evaporator 2 , an indoor fan 3 , a throttle valve 4 , a condenser 5 , and an outdoor fan 6 . [0005] In the prior art, the evaporators in the air-conditioning indoor units usually adopt V / A or oblique straight shape. Considering the convenience of production, each evaporator adopts uniform tube distribution, that is, each circuit has equal tube ...

AI Technical Summary

Problems solved by technology

In the evaporator of this structure, ideally, the flow rate of refrigerant flowing through each circuit is approximately uniform, but due to the difference in the form of fans used in practice and the air ducts such as compressors, plate heat exchangers, pipelines, electric Due to the influence of components such as the control box, the air volume blown through each circuit of the evaporator is uneven, so it cannot be guaranteed that the refrigerant flow rate of this circuit is appropriate under this air volume. If the flow rate of this circuit is too large, the refrigerant will not evaporate. Completely, liquid at the outlet will cause liquid shock of the compressor; if the flow rate of the circuit is too small, the outlet will overheat, which will easily cause the suction and exhaust temperature to be too high, affect the lubrication effect of the compressor, and increase the probability of compressor failure

It can be seen that the existing control method of the evaporator cannot guarantee the full use of the heat exchange capacity of the evaporator, and will seriously affect the reliability of the compressor

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