How does the centrifugal pump operate to avoid blockages?
Aug 07, 2019
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How does the centrifugal pump operate to avoid blockages?
The conventional centrifugal pump, when the water flows into the volute and is thrown out by the centrifugal action, the sudden change in the direction of the 90degree angle will inevitably cause a significant collision. The sudden change in this direction makes it easy for the solid to stay in the volute due to inertia. Or on the impeller, causing blockage and greatly reducing the pumping capacity of conventional centrifugal pumps.
At the same time, conventional centrifugal pumps are even more powerless when transporting fiber solids. The diameter of the spherical particles passing through the solid claimed by the conventional non-blocking pump is only for the more regular solid particles and does not reflect the ability to transport the fibrous object. But in fact, when passing a large number of fibrous objects (such as hair, ladies stockings, sanitary napkins, etc.), these fibers are hooked by the impeller after entering the pump body, and are wound around the impeller until the pump stops.
The advantage of the nonclogging of the spiral centrifugal pump is that the impeller has a twisted spiral blade which is extended axially by the suction port, and the radius of the blade is gradually increased to form a very wide spiral flow path. The casing is composed of a suction port, a lining and a volute. The impeller of the suction port part produces a spiral propulsion, and the impeller of the volute part generates centrifugal action. The acute angle part of the blade inlet guides the debris to the shaft attachment, and then uses the spiral action. After propelling along the axis, the solid particles enter the impeller after the solid particles enter the impeller, and enter the pump body by the parabolic surface formed by the rotation of the spiral vane. Although the rotation is also 90 degrees, the trajectory of the particles passing through the spiral centrifugal pump is gradual, so the liquid The flow is in a smooth open channel and is pumped through under low stress, low mixed flow conditions. And this unique design also allows non-blocking passage of liquids with high solids.
For fine fibers such as soft, easy-to-twist hair, the impeller inlet lining is designed with a unique protrusion that effectively leaves the fibers behind the guard ring, which prevents the impeller tip from hooking the fibers. The blockage also prevents damage to the tip of the impeller caused by the filament wound impeller, which solves the problem of fiber blockage of the conventional non-blocking pump.
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