The selection of the feeder
1. The selection factors of the feeder
The selection of the feeder is the most important factor in the system design. All kinds of feeder have the most appropriate application area of the system pressure. Among them, the bin type pump is usually used in high pressure with intermittent operation; Rotary vane feeder and double flap valve feeder can be used for positive pressure and negative pressure conveying, but usually it is limited in the relatively low range; Screw pump can work well under high voltage, but they are still limited in practical use in the low pressure range; Negative pressure suction nozzle is used only in a negative pressure system and mixed system. In a word, the selection of feeder should be determined according to the rated pressure value, air leakage, pressure drop and flow control as well as to the suitable degree of concrete material ect. such comprehensive factors.
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2. Rated pressure value. Due to a variety of pipeline pressure decline and the pipe diameter applicable for some particular devices, therefore, you should consider to choose a high rated pressure feeder used to supply a smaller diameter of the line. For a given pipe diameter which has a maximum rated pressure value of the feeder producing maximum conveying capacity.¡¡
3. Pressure declination. The pressure declination through the feeder should be as small as possible. The pressure declination of the ordinary screw pump, M type fuller screw pump and storehouse type pump are respectively about: 50 kpa, 21 kpa and 20 kpa; Venturi type feeder of the pressure declination is approximately equal to the pipeline pressure declination; The pressure declination of the rotating vane feeder and double flap valve feeder can be neglected.
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4. The flow control. When the feeding quantity must be kept constant, you should select the screw pump, locking wind rotor blades feeder and double flap valve feeder that can quantitatively feed and satisfy the requirement of locking wind. Venturi feeder can not provide air lock and metering device and it needs a measuring equipment to keep the feeding quantity at a stable state. The bin type pump in unloading material needs to regulate the flow of gas mixture ratio to achieve the flow control.
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