What are divided into main types of centrifugal pump seal

water pump seal, pump seal

is to prevent the pump shaft and shell leak of the shaft sealing and sealing device. Commonly used shaft seal type packing seal, mechanical seal and dynamic seal. Reciprocating pump shaft seal is usually packing seal. When delivery is not allowed to reveal the medium, diaphragm metering pump can be used. Rotary pump ( Including vane pump, rotor pump, etc. ) Water water pump seal packing seal, mechanical seal and dynamic seal. 1, pump packing seal packing seal structure is simple, cheap, convenient maintenance, but large leakage and power loss is big. So packing seal used for conveying medium, like water; Generally not suitable for oil and chemical medium, especially valuable, cannot be used in explosive and toxic medium. Packing seal of pump are: IS type single-stage single-suction centrifugal pump, screw pump, horizontal multi-stage centrifugal pump and so on, now this several pump mechanical seal products, can make it to avoid the phenomenon of packing seal of drip. 2, the water pump mechanical seal

the water pump mechanical seal, Also known as end face seal) The sealing effect is good, leak amount is very small, long life, but the price is expensive, processing installation maintenance is higher than general containment requirements. Mechanical seal of pump is suitable for the oil and chemical medium, can be used for a variety of different viscosity, strong corrosion resistance and medium containing particles. The American petroleum institute standards; In addition to the user has a regulation, shall be equipped with a container type mechanical seal. 3, water pump power sealed power vice impeller seal can be divided into back vane seal and seal. Back when the pump work blades ( Or vice impeller) Effect of centrifugal force is the shaft sealing medium pressure drops to atmospheric pressure or negative pressure state, make the pump in use process does not leak. When parking centrifugal force disappears, back blades ( Or vice impeller) Sealing function failure, then by parking sealing device sealing effect. And back blades ( Or vice impeller) Form a complete set of parking in the sealing device mainly using packing seal. Packing has ordinary type and mechanical elastic type two kinds. Ordinary type packing seal packing seal pump is similar to that of a general, requirements keep micro positive pressure shaft seal, in order to avoid packing dry friction. Mechanical parking elastic packing seal USES weight, make the pump packing loosen at runtime, when parking packing pressure. Parking in order to ensure the life of the sealing device, reduce the leakage of the pump, to use dynamic seal pump, the pump inlet pressure should be limited, namely: Ps < 10% Ps&mdash Pd type; The pump inlet pressure, MPa; Pd - The pump inlet pressure, MPa; power sealed performance is reliable, cheap, convenient maintenance, suitable for conveying more medium containing solid particles, such as phosphate industry in desulphurization pump, filter press pumps, etc. The disadvantage is that the mechanical seal, power loss and the parking sealing device live shorter lives.

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