Oil balancing device for multi-connected machine and control method thereof

Abstract

The invention discloses an oil balancing device for a multi-connected machine. The oil balancing device comprises an outdoor machine module consisting of more than one units, wherein the units comprise a first unit, a second unit and a third unit; the first unit consists of a compressor, a first capillary tube, a second capillary tube, a one-way valve and an electromagnetic valve which are connected with one another sequentially; the compressor comprises a first compressor and a second compressor; copper tubes which are communicated with each other are arranged on low-pressure chambers of the first compressor and the second compressor; an oil balancing component is arranged between the adjacent compressor; the electromagnetic valve is arranged on the oil balancing tube component and is used for controlling on or off of the oil balancing tube component; the oil balancing tube component comprises an internal oil balancing tube and an external oil balancing tube; the one-way valve is connected with the internal oil balancing tube in series; and the first capillary tube is connected with the one-way valve in parallel. The oil balancing device has a simple and reasonable structure, a small quantity of pipelines and components, simple control process and low material and processing cost and takes the characteristics of the mainstream machine with digital and constant speed or variable frequency and constant speed into full consideration.

Description

technical field [0001] The invention relates to an oil equalization device for multiple machines and a control method thereof. Background technique [0002] In the prior art modular low-pressure chamber multi-connection oil balance technology, a solenoid valve is generally set as a bypass circuit switch between the high-pressure exhaust pipe and the low-pressure air return pipe of the compressor. Such as Chinese patent document CN1707201A on December 14, 2005 disclosed a kind of air conditioner and the method for carrying out oil balance operation in the air conditioner; Patent document CN101093121A disclosed a multi-connected air conditioner unit oil balance device on December 26, 2007, which uses a specific compressor to be turned on, and its higher exhaust pressure is led to the compressor oil pool or storage through a bypass pipe. The oil tank is pressurized, and the oil is discharged to the compressors of other modules through the external oil balance pipe, so as to re...

AI Technical Summary

Problems solved by technology

And the internal oil balance structure of the system is often a simple copper pipe connection. Under the current mainstream form of digital plus constant speed or frequency conversion plus constant speed, this oil balance method does not consider the characteristics of each compressor in the module, and at the same time The oil balance operation within the module also needs to be completed together with the oil balance operation between modules, which increases the time and complexity of the system oil balance operation

These methods all use complex bypass circuits and more components such as solenoid valves and one-way valves. The control is complicated and the cost of components and processing technology is expensive. The use of a large number of components also reduces its reliability.

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