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Gear pump special effect
Positive displacement pump (PD pump, or positive displacement pump) should be considered for liquids with high viscosity. When the pressure needs to be increased, some positive displacement pumps are unsustainable. When the temperature rises, other pumps will also fail . The external gear pump has two meshing gear shafts of the same size. The drive shaft is connected to a motor or reducer and drives the other shaft. In a heavy duty industrial gear pump, the gear is usually integral with the shaft and the journal tolerance is small . Gear pumps are available in three common types of gears: straight, helical and herringbone teeth. These three forms have their own advantages and disadvantages, have different applications, straight tooth is the simplest form, the optimal application under high pressure conditions, because there is no axial thrust, and the transmission efficiency is higher. The pulsation is minimal and quieter at higher speeds because the meshing of the teeth is gradual. However, due to the axial thrust, the choice of bearing material may result in a limited pressure difference between import and export, lower viscosity, because the axial force will push the gear to the bearing face and friction, so only the choice of higher hardness bearing material Or in the end of the special design, in order to cope with this axial thrust.