The importance of urban sewage reaching the sewage treatment plant through the sewer system as one of the sewage treatment plants is self-evident. How much do you know about blowers? 1, Roots blower, Roots blower works Roots blower is a constant volume fan, delivered air volume is proportional to the number of revolutions, the trilobed impeller is rotated twice by the two impellers for suction and exhaust every two rotations, and the gas pulsation becomes less and the load Small changes, high mechanical strength, low noise, vibration is small. In the two parallel axis is equipped with two trilobate impeller, the wheel and the oval-shaped hole in the chassis and the impeller always maintain a slight gap between the three, as the impeller rotation in opposite directions for uniform rotation, so that the box And a certain amount of gas surrounded by the impeller from the suction side to the discharge side. Each impeller is always maintained by the synchronous gear phase correct, will not touch each other phenomenon, which can be high-speed, without internal lubrication, and simple structure, stable operation, stable performance, to adapt to a variety of uses, has been used in a wide range of field. 2, centrifugal blower working principle (with centrifugal pump) When the motor rotates to drive the fan impeller to rotate, the gas between the blades in the impeller also rotates, and the gas is thrown out under the centrifugal force to increase the gas flow rate so that the gas converts the kinetic energy into the static pressure energy in the flow and then With the fluid pressure, so that static pressure can be converted to speed, exhaust through the exhaust gas, and in the middle of the impeller to form a certain negative pressure, due to the inlet was negative pressure, so that the external air immediately under the action of atmospheric pressure Into the continuous rotation of the impeller continuous discharge and fill gas, so as to achieve the purpose of continuous blasting. Under the same power, wind pressure and air volume are generally inversely proportional. The same power, the wind pressure is high, the air volume will be relatively low, while the air volume, wind pressure will be lower, so as to take full advantage of motor efficiency. 3, rotary blower structure and working principle Blower pressure range: 0.1-0.5kgf / cm2 Rotary blower compact structure, mainly consists of the following six components: motor, air transition, blower body, air chamber, base (and fuel tank), the nozzle. The blower is eccentrically operated by the rotor biased in the cylinder, and the volume change between the four vanes in the rotor slot sucks, compresses and discharges the air. In operation, the pressure difference of the blower is used to automatically send lubrication to the drip nozzle, dropping it into the cylinder to reduce the friction and noise, and at the same time, the gas in the cylinder can be kept from flowing back. 4, centrifugal blower structure and working principle Rotary blade extrusion propulsion force fluid to obtain energy, increase its pressure energy and kinetic energy, its structure as shown. The impeller 1 is installed in a cylindrical (fan-conical) pump housing 3, and when the impeller rotates, the fluid flows in the axial direction and flows out in the axial direction after energy is obtained in the blade vanes. Centrifugal blower, Roots blower, rotary fan characteristics of the difference 1) Use a Roots blower if the load requires a constant flow effect. Because Roots blower is a constant flow fan, the main parameter of work is the air volume, the output pressure changes with the pipe and load changes, the air volume changes little. This is one of the reasons Roots blowers are becoming more popular with users. The Roots blower is a high pressure blower. The Roots blower is a positive displacement blower. The volume of air delivered is proportional to the number of revolutions and the gas is delivered from the suction side to the discharge side. Centrifugal fans are used if the load requires a constant pressure effect. Because the centrifugal fan is a constant pressure fan, the main parameter of work is wind pressure, the output of the air volume changes with the pipe and load changes, wind pressure changes little. Centrifugal fan, the wind pressure is not large. The air compression process is usually carried out by several working impeller (or what level) under the action of centrifugal force. Centrifugal fan is square torque characteristics, and Roots blower is basically constant torque characteristics. 2) Roots blower is generally larger than the pressure, the pressure is relatively large, the same Roots blower noise is also great. If you need a relatively small amount of air, the noise is relatively high, the use of rotary blower, rotary blower also belong to the constant flow fan, the main parameters of work is the air volume, the output pressure changes with the pipe and load changes in air volume is small , Rotary blower is a variable capacity compression, its main features are: low speed, low noise, low vibration, high efficiency, high energy saving. Axial flow fan (blade type) is also the main feature of constant pressure operation, when the pressure changes or obstruction within the pipeline, it will automatically adjust the amount of air supply to ensure constant wind pressure. Axial flow pumps and fans for large flow, low pressure, power plants are often used as a circulating pump and induced draft fan. China's use of centrifugal blower experience, especially the large centrifugal blower still to be improved, the selection should be closely with the production plant.
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