Oil return flow path for multi-connected compressors and control method of oil return flow path

Abstract

The invention discloses an oil return flow path for multi-connected compressors. A multi-connected outdoor set consists of N outdoor units which are connected in parallel; M compressors which are connected in parallel, a liquid storage tank, a condenser, a fan motor, an electronic expansion valve and a four-way valve are arranged in each outdoor unit; an oil discharge outlet is formed at the bottom of each compressor; an oil discharge pipe is connected between the oil discharge outlet and an air exhaust of each compressor; an oil return pipe is arranged between the bottom of the liquid storage tank of each outdoor unit and main air return pipes of the M compressors in the outdoor unit; an oil separator is connected with the air discharge side of each compressor; the oil separator is provided with a bypass pipe connected to another compressor; the oil separator of each outdoor unit is connected with an oil balance pipe; and the oil balance pipes of the N outdoor units are connected with a main balance pipe. By the oil return flow path, lubricating oil in the multi-connected compressors can be distributed uniformly to ensure that the compressors can run normally and safely.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, and more specifically relates to a multi-connected compressor oil return flow path and a control method thereof. Background technique [0002] The multi-connected air-conditioning system only entered the Chinese market in the 1990s. With its advantages of free control, high efficiency and energy saving, and easy installation and maintenance, it quickly occupied an important position in the central air-conditioning market. With the continuous advancement and implementation of the national energy saving and emission reduction policy, the advantages of energy saving and high efficiency of the multi-line will be recognized and accepted by users, and the market share of the multi-line will continue to grow. However, the control of the amount of lubricating oil in the existing multi-line system has always been a difficult problem in the multi-line system. [0003] We know that the com...

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Problems solved by technology

[0006] The purpose of the invention is to solve the disadvantages of the existing multi-line compressor oil return method, to provide a new multi-line compressor oil return flow path and its control method, to ensure the uniform distribution of lubricating oil in each compressor, so that the compressor can work normally. , reliable and safe operation, thereby improving the stability of the multi-line system and increasing its service life, and solving the problem of difficult oil return control of multi-line compressors

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