Oil return control method and system of variable refrigerant volume air conditioning system
A technology of oil return control and control method, which is applied in the direction of air conditioning systems, refrigerators, compressors, etc., can solve the problems of room temperature drop and affect the heating effect, so as to reduce the impact, improve the heating effect, and meet the oil return requirements Effect
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0036] The multi-split unit includes an outdoor unit and multiple indoor units, and expansion valves are arranged on the connecting pipelines between each indoor unit and outdoor unit. The expansion valve is generally arranged on the liquid pipe of the indoor unit to regulate the flow of refrigerant flowing into the indoor unit. The liquid pipe of each indoor unit is connected with the liquid pipe of the outdoor unit. For example, see figure 1 As shown, an expansion valve 1 is arranged on the liquid pipe of the indoor unit 1, an expansion valve 2 is arranged on the liquid pipe of the indoor unit 2, an expansion valve 3 is arranged on the liquid pipe of the indoor unit 3, ..., in the indoor An expansion valve N is arranged on the liquid pipe of th...
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