Multi-split system capable of defrosting alternately without stopping as well as defrosting control method

Abstract

The invention discloses a multi-split system capable of defrosting alternately without stopping as well as a defrosting control method, and belongs to the technical field of air conditioning. The combined air-cooling variable-frequency multi-split in the prior art needs to stop a compressor and cooperates with the switching state of a four-way valve to defrost, so that the energy-saving requirement is not met, the service life of the machine unit is influenced and the customer experience is seriously influenced. A hot gas bypass device is arranged between a gas discharge port of the variable-frequency compressor and an outdoor condenser liquid pipe; when any one base module of an outdoor unit meets the defrosting requirement, a defrosting electromagnetic valve and an oil balance valve of the module are controlled to be opened, a heating expanding valve assembly is closed and the variable-frequency compressor is started to reach the defrosting frequency; other base modules of the outdoor unit maintain the heating state and the variable-frequency compressor performs defrosting, compensation and frequency increasing. Alternate defrosting without stopping is realized, the four-way reversing valve does not need to be switched to a refrigeration mode and the service life of parts is high; the heating effect of the outdoor unit is not influenced; and the defrosting action is simple, safety and reliability are achieved, and the defrosting efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a multi-connected system and a defrosting control method for non-stop and alternate defrosting. Background technique [0002] Air-cooled air-conditioning units, when heating in winter, during the heat absorption process of the heat pump, because the water vapor in the air gradually condenses on the surface of the outdoor heat exchanger, a thick white layer will form on the surface of the heat exchanger after a long time. Frost will seriously affect the heat exchange effect of the heat exchanger, thereby greatly reducing the heating capacity of the heat pump. And the long-term poor heat exchange can easily damage the key components of the air conditioner. Especially in a multi-connected system, when one drags multiple or multiple drags multiple, the impact is even greater. [0003] In order to ensure the heat exchange efficiency of the outdoor heat exchanger...

AI Technical Summary

Problems solved by technology

However, the compressor of the air conditioning unit needs to be started and stopped many times in this scheme. The process of starting and stopping the compressor not only consumes a lot of power, but also frequently starts and stops the compressor and switches the four-way valve, which will reduce the service life of key components such as the compressor.

And when the air conditioner is defrosting in the cooling state, the heat exchanger of the indoor unit will absorb the heat from the inside of the room, seriously affecti

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