cross flow fan

Abstract

The invention provides a cross-flow fan which comprises a cross-flow wind wheel, a chassis volute, an evaporator, a front volute tongue and a water receiving disc, wherein the chassis volute is provided with a curved inner surface, is covered on the outer side of the cross-flow wind wheel, and comprises a wind outlet section, a wind inlet section and a rear volute tongue; the wind inlet and the wind outlet both extend downward; the wind outlet side of the water receiving disc is also provided with a wind outlet guide plate extending downward from the lower direction of the front volute tongue; the wind outlet guide plate and the longitudinal wall of the front volute form a wind guide angle; and the tangential point of the cross section curve of the rear volute tongue and the water level is a point A, and an included angle formed between the connecting line of the point A and the central point of the cross-flow wind wheel and a vertical line passing through the central point O of the cross-flow wind wheel is theta, and theta is greater than or equal to 45 degrees and less than or equal to 55 degrees. The cross-flow fan provided by the invention has an optimized air channel structure, is high in wind rate, and is low in noise.

Description

technical field [0001] The invention relates to a cross-flow fan, in particular to a cross-flow fan which can be used for both embedded and ceiling-mounted air conditioners. Background technique [0002] The cross-flow fan has the characteristics of high outlet dynamic pressure, long blowing distance, flat and uniform air flow, slender and compact structure, and low noise. It is widely used in air purification and dust removal, ventilation, automobiles, air conditioners and many household appliances. With the improvement of people's living standards, the requirements for the comfort of the acoustic environment for work and life are also constantly increasing, especially because of the aesthetics of the house structure and decoration, higher requirements are put forward for the noise and installation of air conditioners. Traditional embedded or ceiling-mounted air conditioner indoor units use centrifugal fans with high speed and high noise and vibration. Therefore, the embed...

AI Technical Summary

Problems solved by technology

[0003] Chinese Patent Document No. CN101000158A discloses an indoor unit structure of a ceiling type split air conditioner, which adopts a V-shaped evaporator, and the acute angle between the two evaporators and the vertical direction is 45°, which increases the heat transfer. The area of ​​the evaporator reduces the length of the evaporator and the space occupied by the evaporator, but in the vertical direction of the center of the wind wheel, the angle of α is 75°, and the gap between the wind wheel and the volute is large, which increases the position of the fan and the space of the whole machine. thickness

It can be seen from the figure that the flow field and the flow channel are seriously delaminated, and the reflux velocity at the volute tongue is high, which can reach 9-10m / s. In the center of the impeller, the range of the leakage airflow impacting the blade inlet is too large, resulting in a decrease in the effective flow area of ​​the impeller and poor characteristics of the internal and external flow fields

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