Oil balancing device for multi-compressor parallel unit

Abstract

The invention provides an oil balancing device for a multi-compressor parallel unit, which can be used for balancing the oil quantity of all compressors in a multi-compressor parallel system, does not need special parallel compressors, and is suitable for the multi-compressor parallel unit with compressors of various types and amounts. The oil balancing device for the multi-compressor parallel unit includes at least two compressors connected in parallel, wherein an exhaust port of each compressor is connected with an oil separator respectively; two oil return ports with height difference are arranged at the bottom of each oil separator; each higher oil return port is connected with an air suction hole of the corresponding compressor through an oil return capillary pipe; and each lower oil return port is connected with the air suction hole of the adjacent compressor through an electronic valve. The device provided by the invention can guarantee the oil quantity of the compressor under the normal operation, balances the oil quantity of the compressors, guarantees the oil quantity balance in emergency operation after one compressor of the system is damaged, does not need special parallel compressors, and is suitable for the multi-compressor parallel unit with compressors of various types and amounts.

Description

technical field [0001] The invention belongs to the technical field of compressors, and in particular relates to the structural improvement of an oil equalizing device for multi-compressor parallel units. Background technique [0002] At present, most of the large-scale multi-connected systems adopt a multi-compressor parallel system, which not only can better control the output capacity of the compressor and the capacity of the indoor unit through the start and stop of the compressor to adapt to the capacity of the indoor unit, but also facilitates modular production. Reduced equipment costs. For a multi-compressor parallel unit, the oil volume between the compressors will be unbalanced after long-term operation, and even the oil volume of the compressor is too small to cause the compressor to burn out. Therefore, it is necessary to design an oil equalization device for the multi-compressor parallel unit. The oil quantity of the compressor is balanced. [0003] Most of th...

AI Technical Summary

Problems solved by technology

However, it is difficult to control the balance of oil volume in a system with 3 or more compressors connected in parallel. In a system with 3 compressors connected in parallel, if a single compressor operates, the oil discharged from the compressor can return to its own compressor. , will not cause the compressor to lack oil, such as Figure 5 shown; if 3 compressors operate at the same time, cross oil return can be realized, such as Image 6 shown; however, when only two compressors are running, it is difficult to ensure the balance of oil quantity if there is no cross oil return, such as Figure 7 As shown, when compressor 1 and compressor 3 are running, the refrigerant oil in compressor 1 and compressor 3 will return to compressor 1, and no oil will return to compressor 3. Long-term operation will cause compressor 3 Lack of oil

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