Multi-cylinder compressor oil return system, air conditioning system and control method
A technology of oil return system and air conditioning system, which is applied to compressors, compressors, compressors with reversible circulation, etc., can solve the problems of oil return control structure and complicated control method, and achieve the effect of simplified structure and effective lubrication.
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Embodiment 1
[0035] Such as figure 1 , figure 2 As shown, in this embodiment, the present invention provides an oil return system for a multi-cylinder compressor, comprising: an oil return flow path arranged between the outlet of the oil return pipe of the oil separator and the oil inlet of the oil pool of the compressor;
[0036] The oil return flow path includes a first oil path and a second oil path arranged in parallel, a control valve arranged on the first oil path, and a capillary tube arranged on the second oil path, and the control valve has two states of open and closed.
[0037] The oil separator 10 is used to separate the lubricating oil carried in the gas discharged from the compressor from the gas, and is arranged at the direct exhaust port of the multi-cylinder compressor, that is, at the direct exhaust port of the multi-cylinder compressor, For example, the multi-cylinder compressor is a double-cylinder compressor 30, and the refrigerant inhaled by the suction port of one ...
Embodiment 2
[0045] In this embodiment, the present invention provides an air-conditioning system, including a double-cylinder compressor 30, a heat exchange system, and the multi-cylinder compressor oil return system in the above embodiment, and the multi-cylinder compressor oil return system is connected to the double-cylinder compressor Between the direct exhaust port of 30 and the oil inlet port of the oil pool, and the exhaust port of the oil return assembly communicates with the heat exchange system.
[0046] Such as image 3 , Figure 4 As shown, the heat exchange system includes an indoor heat exchange part and an outdoor heat exchange part, and the indoor heat exchange part and / or the outdoor heat exchange part include two heat exchangers. Specifically, in this embodiment, the heat exchange system includes a first Four-way valve 41, second four-way valve 42, outdoor heat exchanger 50, outdoor fan 51, first indoor heat exchanger 71, second indoor heat exchanger 72, indoor fan 73, ...
Embodiment 3
[0050] In this embodiment, the present invention also provides a control method for the above-mentioned air-conditioning system. At least when the two-cylinder compressor 30 is stopped and started, the control valve 21 is opened, so that the oil in the oil separator 10 flows into the oil through the first oil passage. into the oil pool.
[0051] Specifically, it also includes:
[0052] When the air conditioning system operates in cooling mode, the pressures of the first exhaust port 311 and the second exhaust port 321 of the double-cylinder compressor 30 are the same, and the refrigerant discharged from the second exhaust port 321 contains more lubricating oil. A lot of lubricating oil will be separated in the oil separator 10. At this time, the control valve 21 is opened, and the lubricating oil separated in the oil separator 10 is mainly returned to the oil by gravity, that is, it passes through the first oil circuit under the action of gravity and then passes through the co...
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