A complete gear pump consists of motor, reducer, coupling and pump head. The pump head is composed of pump shell, front and rear cover, gear shaft, sliding bearing and shaft seal. High temperature gear pump belongs to positive displacement pump. When working, it relies on the change of working volume caused by the meshing of main and driven gears to transport melt. The working volume is composed of pump body, gear groove and bearing with side plate function.
When the gear rotates in the direction shown in Fig. 1, the melt enters the grooves of the two gears in the suction chamber. As the gear rotates, the melt is brought into the discharge chamber from both sides. The gear meshes again, so that the melt in the groove is extruded from the cavity and pressed into the outlet pipe. As long as the pump shaft rotates, the gear presses the melt to the outlet side, so the pump outlet can reach a high pressure, and the flow rate has little to do with the discharge pressure.