Centrifugal fan and air conditioner

Abstract

The invention discloses a centrifugal fan and an air conditioner, relates to the field of air conditioning and aims to lower fluid flow loss and the noise of the centrifugal fan. The centrifugal fan comprises a first plate, a second plate and vanes arranged between the first plate and the second plate, and a flow deflection channel is formed between every two adjacent vanes; flow deflectors are arranged in the flow deflection channels; the flow deflectors and the vanes are identical in shape but different in size. According to the technical scheme, the flow deflectors are arranged in the flow deflection channels additionally, channels at the front edges of original vanes are narrowed, fluid in the flow deflection channels is accelerated, the kinetic energy of the fluid on the suction surfaces is effectively increased, low-energy fluid is effectively prevented from gathering, growth of the boundary layer thickness is restrained, the airflow separation phenomenon on the suction surfaces of the vanes is reduced, and finally the fluid flow loss and the aerodynamic noise of the centrifugal fan can be lowered.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a centrifugal fan and an air conditioner. Background technique [0002] The backward centrifugal fan includes a front disk, a rear disk and blades arranged between the front disk and the rear disk, and an air duct is formed between the blades. [0003] The inventors have found that there are at least the following problems in the prior art: during the actual operation of the fan, air flow blockage is prone to occur at the inlet of the air duct, and low-energy fluid is easy to accumulate on the suction surface of the blade, forming The large vortex finally causes the fluid to separate at the suction surface near the outlet of the blade, which leads to a large aerodynamic noise during the operation of the wind wheel, which seriously affects the working efficiency of the fan. Contents of the invention [0004] One of the objectives of the present invention is to provide a centrifu...

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Problems solved by technology

[0003] The inventors have found that there are at least the following problems in the prior art: during the actual operation of the fan, air flow blockage is prone to occur at the inlet of the air duct, and low-energy fluid is easy to accumulate on the suction surface of the blade, forming The vortex with a large size will eventually cause the fluid to separate at the suction surface near the blade outlet, resulting in a large aerodynamic noise during the operation of the wind wheel, which seriously affects the working efficiency of the fan

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