
Because the high-pressure vortex air pump has a certain rated pressure, the
fan will become unstable after the rated pressure value is exceeded. If the fan
pressure or flow rate does not meet the requirements, you can use multiple fans
in series or parallel to increase the wind power and increase the output of the
vortex fan. The main measures are: to transform the performance of the existing
blower itself. For example, change the driving force and increase its power to
increase the air volume and pressure; increase the rotation speed of the fan
rotor to increase the air volume and pressure; you can also change the size of
the air pump blades, and the blade widening and the angle of the blades can
change the air volume, but the most The common method is to connect the same
performance vortex fans in series or in parallel to achieve the same pressure
increase.
1. Vortex pumps in series
That is, a pressurizer is placed in front of the suction port of the main
fan to increase the density of the air sucked by the main fan. Since the volume
flow of the main fan is constant, the amount of air passing through the main fan
increases, which not only improves the compression ratio, but also The air
volume is increased, and the fan output is increased. The air volume of the
pressurized fan used in series can be slightly larger than that of the main fan,
but the air pressure is lower. When two fans are connected in series, the
characteristic curve of the fans is lower than that of the two superimposed
ones, which is affected by the distance between the two fans in series and the
pipe network. At the same time, install a cooling device after the pressurized
fan, otherwise the temperature of the main fan is too high. Generally, in order
to increase the wind pressure when connected in series. If the resistance of the
blast furnace pipe network is large, the blast furnace has poor air
permeability, and no large air volume is required, good results can be obtained
after series connection.
2, fans are connected in parallel
Generally, high-pressure fans with the same performance are selected in
parallel, and the outlet pipes of the two high-pressure blowers are combined
into one pipe to supply air along the direction of wind flow. In principle, the
effect of parallel connection is that the wind pressure remains unchanged and
the wind volume is superimposed. When the resistance of the pipe network is
small and the air volume is large, the fans can be used to supply air in
parallel. In order to ensure the effect of parallel connection of fans, except
that the two fans should be of the same model or performance as much as
possible, the outlet of each blower should be equipped with a check valve and a
regulating valve. The check valve is used to prevent the backflow of the
pressure air. The regulating valve is used to adjust the two machines to the
same air pressure when they are connected in parallel. At the same time, because
the air volume increases after the parallel connection, the diameter of the air
supply pipe should be enlarged correspondingly, which causes the resistance loss
of the pipeline. No increase.
The method of series and parallel air supply is only adopted under the
condition of making full use of existing equipment, but it is limited to
increase the output of the fan. Although it can improve the quality of use, the
power consumption of the fan will increase. From this point of view, it is not
Economy.
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The role of the vortex pump