Generally, the speed of Roots blower determines its own noise level. Therefore, the type selection type of Roots blower with low return speed should be selected. At the same time, if there are requirements for the flow of Roots blower, the type of Roots blower with wider blades or larger size should be selected as far as possible, but the price of this type of Roots blower is often high. The fan online selection system of Jingong is really good, and the list is also very detailed, even the price is available. High rotating speed means that the volume of the fan is small, and the same air volume naturally needs to be turned several times more. As long as the rotating speed does not exceed 2000 rpm, the quality is very stable, but the noise is higher. From the perspective of life, it must be longer if the rotating speed is low, but the price is cheap. You can choose according to your own situation.
The rotating speed of roots blower determines the service life of roots blower. Because of the wear problem of the rotor and casing of roots blower, the roots blower with the same parameters and different rotating speeds and slow rotating speeds will surely have a longer service life than the blower with fast rotating speeds. Then comes the wind speed (flow): when the casing volume is the same, the fan with fast speed must have greater flow than the fan with slow speed. Therefore, when selecting Roots blower, we try to fix the rotation speed of Roots blower to meet our needs.
The rotating speed of Roots blower depends on the size and model of the blower. Small fans can rotate at a higher speed, mainly because of the accuracy of the dynamic balancer during the production and manufacturing of the blower. The higher the accuracy, the higher the rotating speed. However, the accuracy of the dynamic balancer is limited in the world at present. All large fans have a lower rotating speed, and small fans can rotate at a higher speed. When selecting the fan, it is better to select medium and low speed to avoid high speed, so as to prolong the service life of the fan.
Generally speaking, the fan speed below 1 ton should be below 2000 rpm, the fan speed above 1 ton should be controlled at 1000-2000 rpm, and the fan speed above 200 diameters should be below 1000 rpm.
There are two transmission modes of Roots blower: direct connection and belt connection. Belt transmission is usually used, because the speed of the directly connected Roots blower is synchronous with the speed of the motor, while the speed of the ordinary 4-stage motor is 1470 rpm, and the cost of selecting other stages of motor is high. Therefore, people generally choose 4-stage motor, which is economical and durable.
V-belt transmission is faced with this problem. How to calculate the difference between the rotational speed of Roots blower and that of motor? The following formula can be used to calculate: motor speed * motor speed=fan speed * fan speed
It is not difficult to see from this formula that as long as the size of the Roots blower pulley is constant, and the rotation speed of the Roots blower can be found from the instructions through the requirements of the flow and pressure parameters, the rotation speed of the Roots blower is also fixed, and the rotation speed of the motor is also constant, then it is easy to calculate the size of the motor pulley.
Text label: Roots blower
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