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Control method for lowering noise of indoor unit of air conditioner and multi-split air conditioner

A technology for air-conditioning indoor units and control methods, applied to noise suppression, heating and ventilation control systems, refrigerators, etc., to achieve the effect of solving liquid flow noise and reducing cavitation noise

Active Publication Date: 2017-08-18
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

[0003] Based on the above situation, the main purpose of the present invention is to provide a control method for reducing the noise of the indoor unit of the air conditioner, which can effectively solve the problem of the liquid flow noise of the indoor unit when the air conditioner starts to cool.

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  • Control method for lowering noise of indoor unit of air conditioner and multi-split air conditioner
  • Control method for lowering noise of indoor unit of air conditioner and multi-split air conditioner
  • Control method for lowering noise of indoor unit of air conditioner and multi-split air conditioner

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Embodiment Construction

[0039] Aiming at the liquid flow noise problem of the indoor unit of the air conditioner, the present invention considers after analysis that these liquid flow noises can be divided into the following three parts according to their sources: fluid flow noise, flashing noise and cavitation noise.

[0040] Among them, the reason for the fluid flow noise is that the liquid always maintains a liquid state during the throttling process of the valve, and the liquid stress or turbulence directly impacts the regulating valve and the pipeline to generate noise. This noise is usually below 90dB(A), so it can be ignored during design and control.

[0041] Flashing means that the liquid becomes a mixed gas-liquid two-phase flow after being throttled by the valve, and the flashing noise mainly comes from the deceleration and expansion of the two-phase flow, and this part of the noise accounts for the liquid flow noise of the indoor unit. The specific gravity is not large, so it can be ignor...

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Abstract

The invention discloses a control method for lowering of an indoor unit of an air conditioner. The air conditioner comprises an outdoor unit and an indoor unit. The indoor unit comprises an indoor unit expansion valve. The outdoor unit comprises a compressor and an outdoor heat exchanger. A subcooler is further arranged between the outdoor heat exchanger and the indoor unit expansion valve and comprises a subcooler expansion valve. The control method comprises the steps that S10, the air conditioner is controlled to start up in a refrigeration mode; S20, the aperture EXV1 of the subcooler expansion valve and the aperture EXV2 of the inner unit expansion valve are controlled, accordingly, the system supercooling degree is established, and the superheat degree of the indoor unit is guaranteed. By means of the control method, cavitation noise of the indoor unit during air conditioner refrigeration start running can be lowered, and then the problem of liquid flow noise of the indoor unit can be effectively solved. The invention further discloses a multi-split air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control method for reducing the noise of an air conditioner indoor unit. The invention also relates to a multi-connected air conditioner. Background technique [0002] The importance of air conditioning to people's daily life and work is self-evident. While enjoying the comfortable temperature and humidity provided by the air conditioner, people always hope that the air conditioner can provide a quieter environment. Therefore, it is particularly important for manufacturers to control the noise level of the air conditioner indoor unit. However, when the air conditioner (especially the multi-split air conditioner) starts to run in the cooling mode, since the system parameters are not yet stable, the indoor unit will often have liquid flow noise at the moment of starting up, resulting in poor indoor comfort. Contents of the invention [0003] Based on the above situat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F13/24F24F11/00F25B40/02F25B41/06F25B49/02F25B41/31
CPCF24F13/24F25B40/02F25B49/02F24F11/84F24F2013/247F25B2600/2513F25B41/31
Inventor 倪毅余凯刘群波陈淦彬薛寒冬傅英胜
Owner GREE ELECTRIC APPLIANCES INC
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