Method and device for controlling electronic expansion valves of indoor units

Abstract

The embodiment of the invention provides a method and device for controlling electronic expansion valves of indoor units, and relates to the technical field of air conditioners. The method and device are used for relieving the problem that in the running process of a multi-split air-conditioning system, due to the fact that electronic expansion valves of indoor units in a shutdown state cannot be completely closed, condensate water and noise are likely to be generated. The method comprises the steps that whether the electronic expansion valves of the indoor units in the shutdown state are incompletely closed or not is determined; if the electronic expansion valves of the indoor units in the shutdown state are incompletely closed, the first process is executed; according to the first process, a first opening degree adjusting command is sent to the electronic expansion valves of the indoor units so that the initial opening degree of the electronic expansion valves of the indoor units can be adjusted to the first opening degree according to the first adjusting amplitude; and after the first preset time, a second opening degree adjusting command is sent to the electronic expansion valves of the indoor units so that the first opening degree of the electronic expansion valves of the indoor units can be adjusted to the second opening degree according to the second adjusting amplitude. The method and device can be used for controlling the electronic expansion valves.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method and device for controlling an electronic expansion valve of an indoor unit. Background technique [0002] Multi-connected air-conditioning system refers to an air-conditioning system in which one outdoor unit is connected to two or more indoor units through piping. The electronic expansion valve is a throttling device often used in multi-connected air conditioning systems, mainly used to adjust the flow of refrigerant. refer to figure 1 , its working principle is: by applying a control signal to the electronic expansion valve, the valve needle 10 is controlled to move up and down, so that the distance between the valve needle 10 and the valve seat 11 is changed, thereby realizing the control of the refrigerant flow. [0003] Assuming that there is one outdoor unit and three indoor units in the multi-split air conditioning system, when the first indoor unit is ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for controlling the electronic expansion valve of the indoor unit, so as to alleviate the problem of condensed water and noise caused by the failure of the electronic expansion valve of the indoor unit in the shutdown state to be completely closed during the operation of the multi-connected air-conditioning system. The problem

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