Air knife system blower, cooling blower air volume, cooling blower

Air knife system blower, cooling blower air volume, cooling blower

 vortex air pump plays an important role in industrial production, cannot leave the credit of the air knife, cooling blower air volume, let's take a look at how the fan uses the wind knife to achieve the drying effect, and its wide application. When the air from the fan enters the blade, it is blown out at high speed in a very thin form, which is equivalent to a sheet of airflow 0.05mm thick. But don't underestimate this sheet, which can reach 30 or 40 times the ambient air, creating a thin curtain of high-intensity, high-flow impact wind. The use of wind knife, the role of fan in the industrial field is more extensive, such as in the automotive industry, fan can be used to blow off extra water, coolant, dust, debris, etc., and steel plate spray before blowing cooling, drying, dust; In the electronic industry can be used for electronic circuit board in the assembly before the rapid drying process; In the chemical industry, before labeling or packaging, fans will also be used to blow away surface chemicals or water; In the metal industry, it is mainly used for polishing, electroplating, painting and coating process before surface drying or cooling, and so on. So many industries choose to use the fan with the air knife to complete the drying task, the air knife system blower, is also reasonable, only shows that the effect of this method is better. With the rapid development of science and technology, people's requirements for the use of fans are becoming higher and higher. According to the observation of the large market of air conditioning and refrigeration, at present, the development trend of foreign fan technology will be along the direction of increasing fan capacity, high efficiency, high-speed miniaturization and low noise

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Large fan capacity continues to increase. With the increasing scale of all kinds of industrial devices, the capacity of all kinds of fans is also increasing, and fans of large size will be welcomed in the market in the next few years. Efficient. In order to improve efficiency, three-way flow impeller has been more and more widely used in ventilators. Other special-purpose developments such as oblique flow fans will be more marketable. High speed miniaturization. Three - dimensional flow impeller is adopted to improve efficiency and pressure. Therefore, under the same conditions, the outer diameter of the impeller can be reduced by 10% ~ 30%, so as to achieve the dual effect of reducing the volume and weight. Increasing speed is also one of the important ways to miniaturize the fan. Low noise. Fan noise is one of the main sources of noise pollution in industrial production. The large size and high speed of fan make the noise problem very prominent. For low frequency noise, the fan mainly through improving the fan structure design, reduce the body noise, if not up to the requirements, can take measures such as installing muffler. Through the above analysis, it is not difficult to find that these technical development directions are not only the future development trend of foreign fans, but also the technical direction of the domestic fan industry. Noise vibration reduction technology: fan is a kind of enormous quantity wide general machinery equipment, in chemical, petroleum, metallurgy, mining, machinery and other industrial departments and some civilian sector is widely used, the cooling fan, the noise of the fan in operation often become can affect the health of workers and interfere with the quiet environment, the root of serious interference people's normal work and rest, To become a public nuisance. The fan discrete noise (rotating noise) : related to the rotation of the impeller. Especially in the case of high speed, low load, centrifugal low pressure blower, this noise is particularly prominent. Discrete noise is caused by the interaction between the asymmetrical structure around the blade and the circumferential non-uniform flow field caused by the design test rotation of the blade mouth. Is thought to have the following kinds:

 (1) before the inlet because leading blade or metal net and the air inlet noise interference

  (2) leaf blade in matte or asymmetric chassis

(3) the rotation frequency of the noise is a centrifugal diffuser due to the existence of the volute tongue or axial fan after the existence of the guide vane and the export interference noise, with discrete spectrum characteristics of discrete noise, The fundamental frequency (the frequency corresponding to I =1) is the most noisy, and the higher harmonics decrease accordingly.

Fan eddy current noise: it is caused by various separation eddies when the air flow, Think there are four common causes

  (1) when a certain coming flow turbulence intensity produced by the air flow to the blade to flow turbulence noise

  (2) the airflow through the blade surface due to the fluctuation of turbulent boundary layer turbulent boundary layer

(3) the noise produced due to the blade surface of turbulent boundary layer in the blade trailing edge off the detached vortex noise

  (4) the axial flow ventilator due is greater than the convex and concave pressure The top eddy current noise caused by the secondary flow from concave to convex at the tip of the blade is carried away by the main flow.