Control method of multi-split air conditioning system

Abstract

The invention belongs to the technical field of air conditioning, and aims to solve the problems that an existing refrigerant leakage detection scheme has certain hysteresis quality, and real-time detection of a whole pipeline system cannot be achieved. The control method comprises the steps that the actual pressure drop of a main pipeline, the actual pressure drop of an outdoor unit and the actual pressure drop of each indoor unit are obtained, and the actual pressure drops are compared with respective theoretical pressure drops; and if the actual pressure drop of the main pipeline is larger than the theoretical pressure drop of the main pipeline and the situation lasts for set time, or the actual pressure drop of the outdoor unit is larger than the theoretical pressure drop of the outdoor unit and the situation lasts for set time, or the actual pressure drop of any indoor unit is larger than the theoretical pressure drop of the indoor unit and the situation lasts for set time, it can be determined that refrigerant leakage happens to the multi-split air conditioning system. According to the control method, the pipeline of the multi-split air conditioning system can be detected in all directions in real time, detection lag is avoided, and the operation safety of the multi-split air conditioning system is improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and specifically provides a control method for a multi-connected air conditioning system. Background technique [0002] Air conditioners are air conditioners, which can adjust and control the temperature, humidity and cleanliness of the ambient air in buildings, and provide convenience for people's lives. The air-conditioning system is divided into two categories: comfort air-conditioning and process air-conditioning. Comfortable air conditioners require suitable temperature and comfortable environment, and have no strict requirements on the adjustment accuracy of temperature and humidity. They are widely used in housing, offices and shopping malls, etc.; process air conditioners have certain requirements for temperature adjustment accuracy, and the cleanliness of the air must also be relatively high. Requirements for electronic device production workshops, precision instrument producti...

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Problems solved by technology

[0005] In order to solve the above problems in the prior art, that is, in order to solve the problem that the existing refrigerant leakage detection schemes have certain hysteresis and cannot realize real-time detection of the entire pipeline system, the present invention provides a multi-connected air conditioner The control method of the system, the multi-connected air-conditioning system includes an outdoor unit and multiple indoor units, and the multiple indoor units are connected to the outdoor unit through a main pipeline. The control method includes: obtaining the actual pressure drop, the actual pressure drop of the outdoor unit, and the actual pressure drop of each of the indoor units; the actual pressure drop of the main pipeline is compared with the theoretical pressure drop of the main pipeline, and the The actual pressure drop is compared with the theoretical pressure drop of the outdoor unit, and the actual pressure drop of each of the indoor units is compared with the respective theoretical pressure drop of each of the indoor units; if the actual pressure drop of the main pipeline greater than the theoretical pressure drop of the main pipe for the set time, or the actual pressure drop of the outdoor unit is greater than the theoretical pressure drop of the outdoor unit for the set time, or the actual pressure drop of any one of the indoor units If the pressure drop is greater than the theoretical pressure drop of the indoor unit and continues for the set time, it is determined that the multi-connected air conditioning system has refrigerant leakage

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