Multi-connected system and its mode switching control method

Abstract

The invention discloses a multiple on-line system and a mode switching control method thereof. The method includes the following steps that when any of a plurality of indoor units receives a mode switching instruction, the indoor unit sends the mode switching instruction to a flow distribution device; when judging that the indoor unit is switched into a heating mode from a refrigerating mode according to the mode switching instruction, the flow distribution device controls a refrigerating control valve corresponding to the indoor unit to be closed, and before controlling a heating control valve corresponding to the indoor unit to be opened, the flow distribution device adjusts the opening degree of a first throttling element so that the front and back pressure difference of the heating control valve corresponding to the indoor unit can be reduced. According to the method, when the indoor unit is switched into the heating mode from the refrigerating mode, the front and back pressure difference of the heating control valve is reduced by adjusting the opening degree of the first throttling element in the flow distribution device, and therefore noise generated during mode switching is lowered, and user experience is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a mode switching control method of a multi-connection system and a multi-connection system. Background technique [0002] For the multi-connected system, its operating characteristic is to meet the user's heating demand while meeting the cooling demand of the user. Therefore, during its operation, there is mutual switching between the cooling mode and the heating mode of the indoor unit. [0003] Usually, during the mode switching process, when the operating mode of the indoor unit is switched from the cooling mode to the heating mode, the cooling control valve corresponding to the indoor unit is closed first, and then the heating control valve corresponding to the indoor unit is opened. Since the heating mode of the indoor unit works in the high-pressure area, while the cooling mode works in the low-pressure area, when the mode is switched, the working pressure range wi...

AI Technical Summary

Problems solved by technology

Since the heating mode of the indoor unit works in the high-pressure area, while the cooling mode works in the low-pressure area, when the mode is switched, the working pressure range will change from the low-pressure area to the high-pressure area, and the pressure difference between the front and rear of the heating control valve will change. relatively large, resulting in greater noise

When the operating mode of the indoor unit is switched from the heating mode to the cooling mode, the heating control valve corresponding to the indoor unit is closed first, and then the cooling control valve corresponding to the indoor unit is opened, and the working pressure range will change from the high pressure area to the low pressure area. area, the pressure difference between the front and back of the refrigeration control valve will also be relatively large, resulting in greater noise

[0004] Therefore, switching between the above two modes will generate a lot of noise, which will affect the user experience.

Images