The gear pump is driven by an independent motor, which can effectively block the upstream pressure pulsation and flow fluctuation. The pressure pulsation at the outlet of the gear pump can be controlled within 1%.
The use of a gear pump in the extrusion production line can increase the flow rate and reduce the shear and residence time of the material in the extruder.
External gear pump is a widely used gear pump, and the general gear pump usually refers to the external gear pump.
Its structure mainly consists of drive gear, driven gear, pump body, pump cover and safety valve. The sealed space formed by the pump body, the pump cover and the gear is the working chamber of the gear pump.
The axes of the two gears are respectively installed in the bearing holes of the two pump covers, and the drive shaft of the gear protrudes from aout of the pump body and is driven to rotate by the motor. The external gear pump has the advantages of simple structure, light weight, low cost, reliable operation and wide range of applications.
When the gear pump operates, the drive gear rotates with the motor, driving the driven gear accordingly.
As the meshing teeth on one side of the suction chamber gradually separate, the volume of the suction chamber increases and the pressure decreases, and the liquid in the suction tube is sucked into the pump; The tooth groove is pushed towards the discharge chamber by the gear wheel.
After the liquid enters the outlet chamber, due to the continuous meshing of the teeth of the two gears, the liquid is compressed and exits the outlet chamber into the outlet tube. The drive gear and driven gear rotate continuously and the pump can run continuouslyaspirate and dispense liquid.
The pump body is equipped with a safety valve. When the discharge pressure exceeds the specified pressure, the discharge liquid can automatically open the safety valve to allow the high-pressure liquid to return to the suction pipe.
Internal gear pump consisting of a pair of meshing internal gears, a crescent-shaped central part and a pump housing. The function of the crescent is to separate the suction chamber from the discharge chamber.
When the impeller rotates, a partial vacuum is created at the point where the gears disengage and liquid is drawn into the pump to fill the space between the teeth of the suction chamber , and then it is divided along the inside and outside of the crescent. Two ways into the discharge chamber. When the teeth mesh, the fluid present between the teeth is compressedand directed into the outlet pipe.
In addition to the characteristics of self-priming ability and discharge pressure regardless of the flow rate, the gear pump has no suction valve and discharge valve on the pump body, and has the characteristics of simple structure, smooth flow rate and reliable operation. However, it has low efficiency, high levels of noise and vibration, and is easy to wear out. It is used to transport various oils that are non-corrosive, non-solid and lubricating. The temperature generally does not exceed 70 ° C, such as B. Lubricating oil and edible vegetable oil.