Multi-stage centrifugal blower: the difference between multi-stage centrifugal blower and single-stage
2020-11-13
Summary
The single-stage and multi-stage centrifugal type blowers are a kind of speed regulating fan, that is, during the rotation of the working wheel, the speed of the gas increases due to the action of the rotating centrifugal force and the diffusion flow in the working wheel, and then the diffuser is used to convert the speed energy into pressure energy. The specific differences between the two are:
The single-stage and multi-stage centrifugal type blowers are a kind of speed regulating fan, that is, during the rotation of the working wheel, the speed of the gas increases due to the action of the rotating centrifugal force and the diffusion flow in the working wheel, and then the diffuser is used to convert the speed energy into pressure energy. The specific differences between the two are:
The single-stage centrifugal fan has only one set of impellers, and the air compression is completed at one time, while the multi-stage centrifugal blower has multiple sets of impellers on the main shaft, and the air compression is gradually completed between the groups. Since the centrifugal fan relies on increasing the air flow rate, that is, relying on the kinetic energy of the air to compress the air to increase the pressure to obtain the same pressure, the impeller of the single-stage centrifugal fan needs to be tens of times higher. Under normal circumstances, the speed of multi-stage fan is only thousands of revolutions, while the speed of single-stage fan is as high as tens of thousands of revolutions or even hundreds of thousands of revolutions.
Since the supply of pressure largely depends on the increase of speed, and the supply of speed is limited by balance, lubrication and material properties, single-stage centrifugal fans are used more at low pressure, and more at high pressure. Multi-stage centrifugal-type blowers.
Since single-stage centrifugal fans rely more on gearboxes to achieve high speeds, fan maintenance is particularly troublesome. A separate lubricant must be supplied at the same time. At the same time, due to the high-speed operation of the blades and other parts, the service life of the multi-stage centrifugal blower is better than that of the single-stage blower.
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