Centrifugal pumps become ineffective as viscosity increases, and users need to consider using positive displacement pumps (PD pumps, or positive displacement pumps). When pressure needs to rise, some positive displacement pumps are unsustainable. As the temperature rises, the other pumps will also fail. External gear pump has two same size gear shaft. The drive shaft connects the motor or reducer (via flexible coupling) and drives the other shaft. In heavy duty industrial gear pumps, the gear is usually integral with the shaft (one part) and the journal tolerance is small. There are three common forms of gear: straight teeth, helical teeth and herringbone teeth. The three forms have their own advantages and disadvantages, have different applications. Straight teeth are the simplest form and are optimally used under high pressure conditions because there is no axial thrust and the delivery efficiency is high. Helical teeth have the least amount of pulsation during delivery and are quieter at higher speeds because the meshing of the teeth is gradual. However, due to the axial thrust, the selection of bearing material may result in limited pressure difference between inlet and outlet and lower viscosity. Because the axial force will push the gear to the bearing face and friction, so only choose the higher hardness of the bearing material or in its end face for special design, in order to cope with this axial thrust. External gear pump operation principle is very simple. The liquid enters the suction side of the pump, is inhaled by the interdental cavities that are not engaged, and is then entrained within the cavities in the interdental space, reaching the exit end along the outer periphery of the gear shaft. The re-engaged tooth pushes the liquid out of the hole into the back pressure.
Common Rail Test Bench
Common rail test bench is becoming popular in the automotive after-Service market.
Common rail injection system is an electronic diesel injection system, which is adopted on most modern vehicles. To diagnose and maintain the electronic injector, common rail injector test bench is the perfect choice.
Common rail diesel test bench could test both solenoid and piezo injector, applicable to Euro 3 Euro 4 Euro 5 Euro 6, all brands including Bosch, Delphi, Denso, Cummins, Caterpillar etc.
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