Circulating refrigerant control device and control method for refrigerated transport vehicle

Abstract

The invention discloses a circulating refrigerant control device and control method for a refrigerated transport vehicle. The device includes a controller, an electronic expansion valve used to control the refrigerant cycle in the passenger compartment, a flow regulator used to control the refrigerant cycle in a refrigerated container, and a controller. Simultaneously receive the passenger compartment air conditioner working condition signal and the refrigerated cargo container working condition signal, and through a certain control method, comprehensively adjust the opening of the two flow regulators to ensure the temperature control target of the refrigerated cargo container. The present invention adopts active control of the system, avoids the problem of little practical value caused by the large system efficiency loss, large performance fluctuation, and poor self-adaptation of the existing solutions, and effectively realizes the air-conditioning refrigeration cycle system of the passenger compartment and the refrigeration cycle system of the refrigerated container integration.

Description

technical field [0001] The invention relates to a circulating refrigerant control device and a control method, in particular to a circulating refrigerant control device and a control method for refrigerated transport vehicles, belonging to the field of vehicle refrigeration equipment design and manufacture. Background technique [0002] Refrigerated transport vehicles generally need to add a set of independent refrigerated container refrigeration cycle devices on the basis of the vehicle's own air-conditioning and refrigeration cycle device for the passenger compartment, so as to achieve the purpose of simultaneously cooling the passenger compartment and refrigerated containers. In this way, there will be two sets of independent refrigeration devices on the refrigerated transport vehicle, so that one refrigerated transport vehicle is equipped with two sets of compressors. Such a structural setting will undoubtedly lead to difficulties in layout, and the power load of the dua...

AI Technical Summary

Problems solved by technology

However, due to the differences in the cooling temperature between the cargo compartment and the passenger compartment, and the flow resistance of the circulating refrigerant, the impact will be extremely complex. A simple split into two may cause most of the refrigerant to flow to the passenger compartment, resulting in frosting of the evaporator, and the corresponding cargo compartment cooling cannot be obtained. ensure

[0003] In order to solve this problem, a one-to-two refrigerated unit (Chinese patent CN205373124 U) appeared for refrigerated transport vehicles, which added the first one-way valve and the second one-way valve to keep The expansion and evaporation processes of the two cycles are independent, but in the end the refrigerant on the low-pressure side accumulates to be consistent with the pressure on the low-pressure side of the compressor. The complex interaction cannot solve the problem of reasonable flow distribution; the refrigerating unit and cab air-conditioning system of refrigerated transport vehicles also appeared (Chinese Patent CN 2864520Y) By connecting the evaporator in the cargo compartment and the evaporator in the passenger compartment in series to avoid the problem of flow distribution, but it brings new problems. After the refrigerant comes out of the refrigerated evaporator, it should be a low-temperature and low-pressure gaseous refrigerant. The expansion valve of the front evaporator acts Limited, at the same time, through the heat absorption of the pipeline, the low-temperature and low-pressure gaseous refrigerant contains very little cooling capacity to the evaporator before it, so the application significance is not great

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