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Gear pump is a rotary pump that transports liquid or pressurizes it by the change and movement of the working volume formed between the pump cylinder and the meshing gear.
The structure of the external gear pump china. A pair of meshing gears and pump cylinders separate the suction chamber from the discharge chamber. When the gear rotates, the volume between the teeth where the teeth on the suction cavity side disengage from each other gradually increases, the pressure decreases, and the liquid enters the teeth under the action of the pressure difference. As the gear rotates, the liquid between the teeth is brought to the discharge chamber. At this time, the volume between the teeth of the gear teeth on the discharge cavity side gradually decreases, and the liquid is discharged. Gear pumps are suitable for transporting lubricating liquids that do not contain solid particles, are non-corrosive, and have a large viscosity range. The flow of the pump can reach 300m3/h, and the pressure can reach 3×107 Pa. It is usually used as a hydraulic pump and conveying various oil products. The gear pump has a simple and compact structure, easy manufacture, convenient maintenance, self-priming capability, but large flow and pressure pulsation and high noise. The gear pump must be equipped with a safety valve to prevent damage to the pump or prime mover due to some reasons, such as blockage of the discharge pipe, causing the pump outlet pressure to exceed the allowable value.
working principle:
The gear pump is a type of positive displacement pump. It consists of two gears, a pump body, and front and rear covers. Two enclosed spaces are formed. When the gears rotate, the volume of the space on the side of the gear disengagement increases from small to large, forming a vacuum to suck in liquid. The volume of the space on the engaging side changes from large to small, and the liquid is squeezed into the pipeline. The suction cavity and the discharge cavity are separated by the meshing line of the two gears. The pressure at the outlet of the gear pump depends entirely on the resistance of the pump.
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