The working principle and characteristics of screw pump - Pump industry

screw pump, the working principle of screw pump, screw pump characteristic

first screw pump is developed successfully, in Peru in the 1960 s it was used to transport fish, then used for solid liquid two phase fluid, can also be used to drainage and high viscosity liquids. To prevent solids blocking, flow smoothly, open, Closed) Impeller in one to two, distorted spiral blade on the conical wheel body by suction along the axial extension, the radius of the blade increases gradually, form a spiral flow channel. The shell consists of two parts, the suction pipe and spiral case. The working principle of screw pump, like screw pump, the suction pipe spiral propulsion function part of the impeller, volute part of like a normal centrifugal pump impeller centrifugal effect. Blade inlet near the acute Angle section will sundry oriented axis, using spiral effect to advance along the axis. This pump will work portfolio as a whole, spiral propulsion and centrifugal force of liquid energy transfer relies mainly on the centrifugal force, therefore calls the screw pump.

FIG. 11 22 for single screw centrifugal pump impeller.

because of the screw pump has two aspects of positive displacement pump and centrifugal pump function, compared with general centrifugal pump, screw water pump features as follows:

( 1) Screw pump up good performance ( Double) Blade passage, and imported guide and spiral progress, make the pump through the performance is very good, the characteristics of the screw pump can transport liquid containing larger particles and fiber material, conveying the concentration is higher than other forms non-clog pump.

( 2) Good nondestructive screw pump solid-liquid two-phase fluid in the pump to move forward gradually, no sudden change flow direction, and thus flow smoothly, destructive than other forms of conveying material non-clog pump is small, can be used to transport fish, fruit, etc.

( 3) High efficiency of screw pump as shown in figure 11. A 23 is a common vane impurity pump, screw pump and vortex pump performance comparison. Therefore, the efficiency of screw pump is higher than vortex pump 10% one 20%, 5% ~ 10% higher than common impurity pump, centrifugal pump efficiency and general water phase (almost About 5% lower) 。 Tests show that when 3 xl03 & lt; Re< 3. 4× 104, the efficiency of screw pump and centrifugal pump has the same, as the Reynolds number decreases, screw pump efficiency has a tendency to increase.

( 4) Screw pump power curve is flat power curve changing with flow is not big, generally no overload.

( 5) Screw pump has a steep fall in the general centrifugal water pump head curve, head & middot; Flow curve is relatively flat, especially the low specific speed pump, it's difficult to realize the steep fall in the lift curve. Figure 11 & ndash; 24 said all kinds of specific speed of screw centrifugal pump head * discharge curve, the curve is steep fall. Changes in these curve, relative to the head, small slope changing flow, to ensure stable operation.

( 6) Screw pump inhalation can well before the pump vane to suction, similar to the axial flow pump, even produce local cavitation, pump can still work normally. Therefore, this pump can be pumping liquid containing gas, when inhaled trace gases, the performance of the pump noise, vibration, no change. When the air content of 40%, while repeatedly produce intermittent violent vibration, but can still run pump.

( 7) Screw pump in the small flow pump noise and vibration in the small flow rate zone run will produce noise and vibration, when screw pump from the rate of flow to runtime off dead point region, can produce a lot of vibration and noise.

( 8) Manufacture difficulties screw pump impeller is difficult, high impeller balancing requirements.

recommended products: single screw pump

work principle of screw water pump and the characteristics of the screw pump technology news articles by professional pump original.