7 commonly used seal of chemical pump

 Is a kind of self tight seal lip shape, 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 generally used in low pressure on the occasion of chemical pump. 

 Gaskets are the basic components of the centrifugal pump, which are widely used. Gasket selection is mainly based on the chemical pump transmission medium, temperature, pressure and corrosion and other factors. 

 In the chemical pump generally has two forms, one is the threaded connection gasket seal, one is the thread and filled with the seal, the two are used for small diameter thread connection sealing occasions. Screw coupling electric diaphragm pump gasket sealing gasket is a gasket, and the thread only provides the role of compaction force. 

 In the design is reasonable, processing is excellent, the assembly is complete, the rotational speed is high, the labyrinth seal effect is very good. However, in practical applications, and therefore a lot of chemical pump leakage, so in the chemical pump seal is not commonly used. 

 Is full of compressibility and elasticity of the packing into the stuffing box gland, depend on the axial compression force into radial sealing force, and thus plays a role in sealing. This sealing method is called the packing seal, which is called the sealing packing. Because of the simple structure, convenient replacement, low price, speed, pressure and medium, it is widely used in the design of chemical pump. 

 When the chemical pump is in operation, the pressure head generated by the auxiliary impeller balances the main impeller outlet of the high pressure liquid, thereby realizing the sealing. When parking, the Deputy impeller does not work, it must be equipped with parking and sealing device to solve the leakage of the chemical pump may be produced. 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. 

 Chemical pump industry is now the most widely used in the seal form, due to mechanical seals with less leakage and long life and so on, so the world's mechanical seals are the main shaft seal in these devices. The mechanical seal is also called the seal, in the relevant national standard is defined as: "by at least a pair of end faces perpendicular to the axis of rotation of the fluid pressure and the elasticity of compensation organizations (or magnetic) device and the role of the coordination of auxiliary seals to keep up with the relative sliding to prevent fluid leakage.