The sealing form of chemical pump mainly includes: oil seal, gasket seal, thread seal, labyrinth seal, packing seal and power seal. Here are the brief introduction of these sealing forms.
1. Oil seal seal of chemical pump
Chemical pump seal is a self tightening type lip seal, which has the advantages of simple structure, small size, low cost, convenient maintenance, resistance torque is small, which can prevent the leakage of medium, can also prevent external dust and other harmful substances invasion, and compensation ability to wear, but not high pressure, so the chemical pump generally used in low pressure applications of.
Two, chemical pump gasket seal
The sealing method of the gasket is commonly used in the chemical pump. The gasket is the basic element of the static seal of the centrifugal pump, and its scope of use is very wide. The type selection of the gasket is mainly determined by the medium, temperature, pressure and corrosiveness of the chemical pump.
Three, chemical pump screw seal
There are two forms of screw seal on chemical pumps, one is screw connection gasket seal, one is screw thread plus filling seal, the other two are used for sealing small diameter threaded connection. The sealing piece of the threaded diaphragm pump is sealed by the gasket is a gasket, and the thread only serves as a pressing force.
Four. The labyrinth seal of chemical pump
The labyrinth sealing effect is very good when the design is reasonable, the processing is fine, the assembly is perfect and the speed is high. But in practical application, the chemical pump leakage is very much, so it is not commonly used in the chemical pump seal.
Five, packing seal of chemical pump
The packing seal of chemical pump is filled with filling material with compressibility and resilience into the stuffing box, and the axial compressing force of the gland is transformed into radial sealing force, so as to play a sealing role.
This sealing method is called a packing seal, which is called a sealed packing. Because of its simple structure, convenient replacement, low price, speed, pressure and wide media, packing seal is widely used in chemical pump design.
Six, chemical pump power seal
During the operation of the chemical pump, the pressure head produced by the auxiliary impeller balances the high pressure liquid at the outlet of the main impeller to realize the seal. When parking, the auxiliary impeller does not play a role, so it must be equipped with a parking seal at the same time to solve the chemical pump leakage that may occur when parking.
Vice impeller seal has the advantages of simple structure, reliable sealing, long service life, can be realized leak of chemical pump operation, so it is often used in the chemical pump conveying medium impurity pump.
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