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May 11, 2022 View:

What Are The Common Sealing Forms Of Rotary Lobe Pumps

Rotor pumps have good sealing performance, and there are many forms of lobe pump seals, today Ace lobe pump's will introduce you to several common forms of lobe pump seals.

I. Rubber O-ring seal

The rubber O-ring is one of the common forms of seal used in lobe pumps. Rubber O-rings are not complex in shape and are relatively inexpensive, as less material is required to manufacture them.

The O-ring is installed between the groove and the groove surface with a certain amount of compression. the rebound force generated by the O-ring causes an initial compressive stress on the smooth surface and the bottom of the groove. This results in a sealing effect. When the pressure of the sealing fluid increases, the deformation of the O-ring increases, the pressure transferred to the sealing surface increases and the sealing effect increases. This is why O-rings have good sealing performance

II. Gasket seal

Gaskets are a basic component of static seals and are used in a wide range of applications. The selection of gaskets depends mainly on the transport medium, temperature, pressure and corrosion of the chemical pump. The oil seal is a self-tightening lip seal with simple structure, small volume, low cost, easy maintenance and small resistance torque. It can prevent both the leakage of medium and the intrusion of foreign dust and other harmful substances. It also has a certain wear compensation capacity, but also can not withstand high pressure, so it is generally used in chemical pumps for low pressure occasions.

III. Thread sealing

In chemical pumps, there are generally two forms of threaded seals, one is a threaded joint gasket seal and the other is a threaded packing seal, both are used for small diameter threaded joint seals.

Gasket seals for lobe pumps with threaded electric diaphragm pumps have gaskets for the seals, while the threads only provide the compression force. Labyrinth seals have a good sealing effect when they are well designed, well machined, well assembled and rotate at high speed. However, in practice, chemical pumps have a large leakage volume and are therefore not used much in chemical pump seals.

IV. Packing seal

Packing seals are compression and elastic packing placed in a stuffing box, which is sealed by converting the axial compression force of the cover into a radial sealing force. The sealing method for lobe pumps is called packing seal, i.e. seal packing. Packing seal is widely used in chemical pump design due to its simple structure, easy replacement, low price and wide adaptation to speed, pressure and medium.

V. Power seals

When the chemical pump is in operation, the pressure head generated by the secondary impeller balances the high pressure liquid at the outlet of the main impeller, thus achieving a seal. When stopped, the secondary impeller does not work and needs to be equipped with a parking seal to solve the problem of possible chemical pump leakage when stopped.

The above five are the common forms of seals in lobe pumps, to learn more about lobe pumps, please pay attention to our website regularly: