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May 18, 2022 View:

Analysis of the characteristics of various forms of lobe pump seal and the scope of application

lobe pumps have excellent sealing, and there is more than one form of sealing. There are many different types of seals for lobe pumps, and one common form of seal is the use of rubber O-rings for sealing. The O-ring is installed between the groove and the sealed surface with a certain amount of compression, and the resulting rebound force gives the sealed smooth surface and the groove bottom surface an initial compressive stress. The resulting bounce force gives an initial compressive stress to the smooth surface and the bottom surface of the groove, thus providing a seal. When the pressure of the sealed liquid increases, the deformation of the O-ring also increases, thus the pressure transferred to the sealing surface also increases, and the sealing effect also increases. This is the reason why O-rings have good sealing ability. Gasket seal. Gaskets are the basic components of static seals and are used in a wide range of applications. The selection of gaskets is mainly based on factors such as chemical pump transmission medium, temperature, pressure and corrosiveness. Oil seal, a self-tightening lip seal, has a simple structure, small size, low cost, easy maintenance and small resistance torque, which can prevent both media leakage and the invasion of external dust and other harmful substances, and has a certain compensation capacity for wear, but is not resistant to high pressure, so it is generally used on chemical pumps in low-pressure applications. Threaded seal, there are two forms on chemical pumps, one is threaded coupling gasket seal, one is threaded with filler seal, both are used in small diameter threaded connection sealing occasions. lobe pumps have a gasket seal, and the threads only provide the compression force. Labyrinth seals, when reasonably designed, well machined, well assembled, and at high speeds, labyrinth seals work well. However, in actual application, there are many chemical pump leaks as a result, so it is not commonly used in chemical pump sealing. Packing seal, is a compressive and resilient packing into the stuffing box, relying on the axial compression force of the gland into radial sealing force, so as to play a sealing role. lobe pump This sealing method is called packing seal, and this packing is called sealing filler. The packing seal is commonly used in the design of chemical pumps because of its simple structure, easy replacement, low price, and wide adaptation to speed, pressure, and media. Power seal, chemical pump in operation, the pressure head generated by the secondary impeller balanced the main impeller outlet high-pressure liquid, so as to achieve sealing. When stopping, the vice impeller does not work, so it must be equipped with a parking seal at the same time to solve the chemical pump leakage that may occur when stopping.