Air conditioner indoor unit

Abstract

The invention discloses an air conditioner indoor unit, and relates to the technical field of air conditioners. Fin sounds can be eliminated, and meanwhile BPF noise is weakened. The air conditioner indoor unit comprises a centrifugal fan and a heat exchanger arranged outside the centrifugal fan in a surrounding manner. Flow guide plates are arranged at the positions, close to the centrifugal fan,on the inner surface of the heat exchanger. The positions, opposite to the bottom of the centrifugal fan, on the flow guide plates are indented in the direction away from the centrifugal fan and / or deviate in the direction away from incoming flow. The air conditioner indoor unit is used for regulating indoor air.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner indoor unit. Background technique [0002] Air-conditioning indoor unit air supply noise has always been concerned by consumers, so air-conditioning equipment manufacturers are constantly proposing technical improvement plans for this purpose. [0003] Existing commercial air conditioner indoor units (four-direction / two-direction / one-direction series) all use the backward centrifugal fan 01 as the air supply fan. The larger air volume and lower noise can be obtained, but since this series of models all use the design of heat exchanger 02 surrounding the fan (refer to figure 1 with figure 2 ), this design will cause the tangential velocity of the airflow passing through the inner surface of the heat exchanger 02 to approach the maximum when the fan rotates to the closest point of the heat exchanger 02, and the airflow interacts with the fins of the h...

AI Technical Summary

Problems solved by technology

[0003] Existing commercial air conditioner indoor units (four-direction / two-direction / one-direction series) all use the backward centrifugal fan 01 as the air supply fan. The larger air volume and lower noise can be obtained, but since this series of models all use the design of heat exchanger 02 surrounding the fan (refer to figure 1 and figure 2 ), this design will cause the tangential velocity of the airflow passing through the inner surface of the heat exchanger 02 to approach the maximum when the fan rotates to the closest point of the heat exchanger 02, and the airflow interacts with the fins of the heat exchanger 02 to cause the heat exchanger 02 to generate Fin sound (high-frequency howling sound 3000Hz~5000Hz)

[0004] The energy of the finned sound is low in the high-frequency range, and its contribution to the noise is low or negligible, but the finned sound will cause great trouble to the user's comfort experience, so the general design of products in the industry will increase the diversion Plate 03 is used to change the wind direction to eliminate fin noise, but using this design is equivalent to adding a vortex structure to the fan. Due to the existence of the deflector 03 similar to the vortex tongue, the interaction between the fan and the deflector 03 will produce a very obvious BPF ( Fan frequency frequency / rotation noise) noise (refer to image 3 ), the rotation noise is also the main noise source when the indoor unit of the air conditioner is working

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