Comparison of the working principle of several blower in sewage treatment.

1,The roots blower is a positive displacement fan.The amount of air transported is proportional to the number of revolutions.Trefoil-type impeller rotates once by two impeller 3 times, suction and exhaust.Compared with the two-leaf type,there is less gas pulsation.Small changes in load,high mechanical strength,low noise,vibration is small.Two three-leaf impeller.Wheel and elliptical box inner hole surface and each impeller always maintain a slight gap between the three.As the impeller rotates in opposite directions at a constant speed,a certain amount of gas surrounded by the box and impeller is conveyed to the side of the discharge by the suction side.Each impeller always synchronizes the gear to the correct phase.There will be a touch of contact with each other,so it can be high speed.No internal lubrication is required.And the structure is simple,smooth operation,Stable performance,applicable for a variety of purposes.Has been used in a wide range of fields.

2，The working principle of centrifugal blower.

When the motor rotates and drives the fan impeller to rotate.The gas between the impeller blades also rotates.And they're going to throw these gases out of the centrifugal force.Gas flow rate increase，the conversion of kinetic energy to static energy in the flow of gas，and then with the pressurization of the fluid.So that the static pressure can be converted to velocity energy，vent the gas through the vent.，it forms a certain negative pressure in the middle of the impeller.Because of negative pressure at the entrance，the external gas is added immediately under the action of atmospheric pressure.Continuous discharge and refilling of gas under the continuous rotation of impeller.So as to achieve the purpose of continuous blast.Equivalent power.Air pressure is high，the air quantity will be relatively low，the Large volume of air quantity.Air pressure will reduce，In this way, the efficiency of the motor can be made full use of.

3，Structure and working principle of rotary blower

Blower pressure range.：0.1-0.5kgf/cm2The structure of rotary blower is exquisite.It consists mainly of the following six parts：The motor，air transition device、blower body，air chamber，base，drip nozzle.

The blower relies on eccentric rotating rotor in the cylinder.，the air is inhaled by the volume change between the 4 blades in the rotor slot，the compression.Spit out.Use the pressure difference of the blower to automatically send the lubrication to the dripping nozzle during the operation，drop in cylinder to reduce friction and noise.At the same time, the gas in the cylinder can not be reflued.

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