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Centrifugal fan assembled guide vane vortex tongue structure
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Centrifugal fan assembled guide vane vortex tongue structure
The invention discloses a combined guide vanes vortex tongue structure of a centrifugal fan. The centrifugal fan is a forward fan, the front of the vortex tongue are provided with a plurality of guide vanes to assist the vortex tongue, the distance from the guide vanes and the center of an impeller is growing gradually, the front guide vanes play the role of flow guiding and wind cutting, the amount of wind cutting of the back guide vanes is small. Although the clearance between the tongue vortex and the impeller is shrinking, the noise will not increase, the angle between the bottom linked line of each guide vane and an level surface is 10 to 15 degrees, while the angle between the vortex tongue and the level surface is greater than 90 degrees, the centrifugal fan can reduce the overall size, the best angle is 100 degrees to 110 degrees, at the same time, the guide vanes are curved, and one side of a forward vortex tongue is convex, and the guide vanes can rotate a certain angle. The combined guide vanes vortex tongue structure of the centrifugal fan of the invention can reduce the noise and the size of the fan, and, at the same time, make the fan exhaust more evenly.Get more news about Juk Rail Terminal,you can vist our website!
The centrifugal cutter of prior art be mostly the back to, promptly the bending direction of blade is opposite with the direction of air-flow, this centrifugal cutter has very tangible characteristics, be exactly that air quantity is very big, but static pressure is little.A lot of resistance parts are arranged in the centrifugal cutter, comprise vaporizer, electric heater and volute etc., the resistance parts form resistance to the air-flow in the centrifugal cutter, therefore need overcome resistance by static pressure, the effective way that overcomes the static pressure resistance be with afterwards to centrifugal cutter change the centrifugal cutter of forward direction into.The centrifugal cutter of forward direction is meant the centrifugal cutter that the bending direction of blade is consistent with the direction of air-flow, and the characteristics of the centrifugal cutter of forward direction are that air quantity is not very big, but static pressure is big, and higher static pressure can be provided, and is used to overcome bigger system resistance.In the practice,, need the blade more than 43, need motor that very high torque is arranged simultaneously, that is to say, do more merit, need more energy in order to improve air quantity.The experiment that this is carried out, effect are very undesirable.
Simultaneously, as shown in Figure 1, it is thin again that blade is done, and physical thickness is also arranged, when last blade during near the wedge angle of whirlpool tongue 1, this blade and wedge angle distance are very little, blocked air-flow, wind just blows less than wedge angle, in this of short duration time, form the noise of whirlpool tongue 1 and impeller 3, academicly claimed the abnormal sound (BPF) that produces when this skims over whirlpool tongue 1 for blade.Each blade carries out the synchronism running one by one, has produced pulsing airflow, and pulsing airflow has produced pulsation again, thereby the abnormal sound under the certain frequency has just been arranged.
There is the defective that air quantity is little, noise is big in the centrifugal cutter of prior art, this be because:
At first, the whirlpool tongue 1 of prior art centrifugal cutter has only one, and whirlpool tongue 1 is too little from the gap of impeller 3 external diameters, and then fan noise increases severely; If the gap is too big, then air quantity reduces.Consider under the situation of noise, require to guarantee enough big whirlpool tongue 1 gap.