Impurities centrifugal pump, slurry pump and particles with what pump?

In pump use, according to different medium, the selection of pump have different varieties, such as the selection of water pump type liquid containing particles and impurities are different, the impurity pump used to transport the liquid containing solid particles, the requirement of pump flow components corrosion, to prevent solid phase crystallization jams, small number of impeller blades usually in 2 ~ 8, pump body often with wide port. To prevent solid particles into the shaft seal and prevent outside air into, shaft seal adopts the supernatant as sealing liquid, and demanded that the structure of the shaft sealing is reliable. speed is generally not high, usually for 1000 ~ 1500 r/min. Accordingly, the pump efficiency is low. For grain impurity is soft, anhui gold corrosion resistant mortar pump can be used, for hard particles with metal material pump, the following impurity pump performance is explained; A general impurity pump, the impeller and pump body design of impeller with parallel plate, after the slurry into the impeller, outside the exit from the center to both sides to form vortex, impeller cover plate and lined with severe wear before and after, this is the main cause of flow components short life. design form concave at the exit of the impeller, the impeller speed is greater than the middle speed on both sides of the front and back cover plate in the slurry is divided into two strands of fluid at the exit, to the center of rotation, force the particles to the center of swirling flow, reduce the concentration of two side, so as to reduce the wear and tear and two side wall of the runner. Second, seal the centrifugal pump packing seal main impurity, vice impeller sealing and mechanical seal as shaft seal types. Vice impeller seal has the advantage of reliable running, but in the design requirements, vice impeller inlet pressure control within a certain range, the pump should be less than 10% of the pump outlet pressure. This type of shaft seal without shaft seal water, but use vice impeller will increase power consumption, usually for about 5% of the rated power. Must be used with parking sealing, vice impeller common parking seal for packing. Packing price cheap, high reliability, but when handle liquid containing solid particles, must add shaft seal water flushing. General shaft seal water pressure is equal to the pump outlet pressure and 35 kpa. Mechanical seal is a widely used form of seal, but to prevent solid particles into the friction pair and the selection of friction pair material, etc. , some problems difficult to solve. In most applications, the effect is not ideal. 3, material impurity pump flow components can choose materials is more, should according to the physical nature of transporting slurry ( Grain composition, particle size, shape, hardness, concentration, etc. ) And chemical properties, Acid, alkali, oil) And decide. The results showed that the wear of the metal and solid particles ( Abrasive) The speed is proportional to the; The wear rate of the metal with the increase of the particle size increases, the abrasive grain fine, the less abrasion. The wear rate of the metal also increased with the increase of abrasive hardness and concentration increased. Impurity pump transmission means has four, drive straight league ( Elastic coupling, hydraulic coupling) And indirect transmission, V belt, reducer) , and also can through frequency conversion device and thyristor device speed. The tear open outfit is convenient, flexible coupling and V belt transmission price cheap, priority should be adopted. The characteristics of the five, the submerged pump submerged pump is covers an area of small, without shaft seal, won't produce leaks. This pump is equipped with the fluid under bearing, axis can be designed to be longer. Submerged lubrication bearing usually adopt pumping liquid itself. When the medium containing solid particles, can produce abrasion, the bearing clearance increase caused by vibration, so is only applicable to transport the occasions of clear liquid. When the handle liquid containing solid particles, reduce the use of time. Reasonable structure in the pump base plate, adopt two bearing support, cancel the bearing under liquid. Due to the uneven wear of impeller, rotor unbalance degree increase, usually in the design of shaft, the strength and stiffness are to get richer, the diameter of axle design it rough. Cantilever submerged pump often adopt rigid shaft, to avoid the shaft critical speed, the cantilever pump shaft general shoulds not be too long, otherwise need to be bold. In addition of submerged pump speed also chooses type low speed is better.
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