5. Sealing device
The sealing device is mainly used to prevent fluid leakage when the pressure increases. There are many types of sealing devices, and the most used are stuffing seals and mechanical seals. Packing seal is to press some soft packing on the shaft with a certain pressure to achieve the purpose of sealing. The packing will be damaged after a period of use, so it needs to be inspected and replaced regularly. It is normal and beneficial to have small leaks in the use of this type of seal. Packing sealing principle
The mechanical seal device has two hard and smooth surfaces, one static and the other rotating. This kind of sealing device can achieve very good sealing requirements, but they cannot be used in the impurity fluid conveying system, because the smooth surface will be broken and lose the sealing effect. This kind of sealing device is very common in liquid circulation systems because it does not need to be maintained and operated for many years.
Traditional flat gasket sealing device
Shaft sealing device
Commonly used packing seals and mechanical seals are composed of stuffing box shell, soft packing and packing gland. The soft packing is oil-impregnated or graphite-coated asbestos rope. Put it between the stuffing box and the pump shaft to press the gland Tightly force it to deform to achieve a seal.
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