Roots fan is a manifestation of the volumetric rotary blower, is the use of two leaf-mounted rotor in the cylinder for the relative movement so as to carry out the compression and delivery of gas rotary compressor. Its structure is simple, easy to manufacture, in some low-pressure occasions of gas transportation and pressurization can often see it, in the case of special envoys can also be used as a vacuum pump.
The working principle of Roots fan is to rely on gears to keep the two rotors synchronized. When each groove part on the rotor and the inner wall of the cylinder form the state of the working volume, then the gas will be sucked out by the suction port, when it moves to the exhaust port near the moment of connecting with the reach, the gas will receive high pressure to form a backflow, then the pressure in the working volume will suddenly rise, and finally the gas will be sent to the exhaust channel. Because they do not contact each other, and the gap between them has sealing measures, so the discharged gas will not be contaminated by other substances.
The biggest feature of the three-leaf Roots fan is that it has the characteristic of forced gas transmission. In the process of using, if the pressure is adjusted within a certain range and the change of flow rate is almost negligible, coupled with the fact that the transported material is not oily, it will be forced to run. In addition it has the characteristics of simple structure, easy maintenance and long service life, which are shown in the following points:
For every rotation of the rotor of the three-lobe Roots fan, the two rotors will carry out suction and exhaust three times. This will also result in less gas pulsatility, less vibration and low noise.
Although the same purpose can be achieved according to different adjustment methods, the difference is that its energy saving effect will be changed. If the choice of export throttling then the three-lobe Roots fan will produce a huge amount of power consumption; or some people will be selected in the relative flow change is not big when the regulation operation, in fact, this way not only can not energy-saving, and even will cause damage to the regulation device. Generally speaking, the energy-saving effect will change with the change in the depth of regulation, the greater the depth also indicates that the effect is better, so be careful to choose the way to get the maximum benefit. In conclusion, in the actual use of the scenario, both the performance of the three-lobe Roots fan should be shown, but also consider the reliability and economy of the investment, a comprehensive measure.
Thanks to its many advantages, more and more manufacturers are beginning to use, especially in the field of sewage treatment, pneumatic conveying, cement and chemical industry has a wide range of uses.
