A low noise coaxial double impeller cooling tower axial flow fan

Abstract

The invention discloses a low-noise coaxial double-impeller cooling tower axial flow fan. The fan comprises a supporting air cylinder, a first-stage impeller assembly, a power system supporting base frame, vibration absorbers, a vibration reduction platform, a belt reduction gearbox assembly, a flow guide air cylinder assembly, an upper air cylinder and a second-stage impeller assembly. The same power system is provided with the 1.5-grade double-impeller axial flow fan in the structure form of a first-stage impeller, a flow guide and a second-stage impeller, under the condition that the required ventilation quantity of a matched cooling tower is met and the static pressure required by ventilation resistance is overcome, the rotating speed of impeller blades and the rotating speed of flow guide blades both adopt a design method of arranging a blade grid of linear distribution flow type in the radial direction, so that the circumferential speed of the outer circle of a working impeller of the fan is greatly reduced; and the measures of correspondingly increasing the blade chord length, the blade number, and blade installation angle of the impellers are used for achieving active noisereduction of the 1.5-grade double-impeller axial flow fan of the cooling tower. Compared with a single-impeller-stage axial flow fan, the active noise reduction is carried out under the same ventilation quantity and the static pressure of the fan, and the effect of low noise emission is obtained.

Description

technical field [0001] The invention relates to the technical field of special fans for cooling towers, in particular to a low-noise coaxial double-impeller axial flow fan for cooling towers. Background technique [0002] In simple terms, a cooling tower is an evaporative cooling device used to lower the water temperature. It realizes the recycling of cooling water and greatly reduces the consumption of cooling water by the heat exchange system. Therefore, cooling towers have been widely used in fields such as industry and civil buildings, and have made significant contributions to water conservation. But it also produces noise, causing noise pollution to the environment. This issue has been fully concerned by the state and society. [0003] The heat dissipation efficiency of the cooling tower and the air volume of the supporting axial flow fan play a very important factor. The air volume generated by the axial flow fan with the same diameter is proportional to the cube of...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-noise coaxial double-impeller cooling tower axial flow fan, which solves the noise pollution caused by the relatively large noise of the supporting cooling tower special axial flow fan, reduces the problem of sacrificing the thermal performance of the product due to noise control, and obtains Low-noise cooling tower products with better mute effect

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