As shown in the figure:
Gear pumps work by two meshing gears rotating in the form of confined movement. Gear pumps are gear transmission to provide power, gear pumps are quantitative pumps, mostly used for low-precision medium and low pressure control. Gear pump is a commonly used pump.
Its main features are simple structure, easy to manufacture, low cost, low price, small size, light weight, good self-priming performance, insensitive to oil contamination and reliable operation. Its main disadvantage is that the flow and pressure pulsation, noise, displacement can not be adjusted.
It is widely used in various low-pressure systems. Gear pumps have the lowest oil requirements, the earliest time because of low pressure, so it is generally used in low-pressure systems, now the gear pump pressure can be about 25MPA, commonly used in the pressure requirements of the machinery is not high, but his oil pulsation is large, can not be variable, the benefit of self-priming performance is good.
Extended information
Gear pumps are used to transport viscous liquids, such as lubricating oil and combustion oil, should not be used to transport less viscous liquids (such as water and gasoline, etc.), should not be transported to transport liquids containing particulate impurities (affecting the service life of the pump), can be used as a lubrication system oil pumps and hydraulic system oil pumps, widely used in engines, It can be used as lubrication system oil pump and hydraulic system oil pump, widely used in engine, turbine, centrifugal compressor, machine tool and other equipment. Gear pump process requirements are high, it is not easy to get accurate matching.
Classification:
1, according to the form of gear meshing can be divided into: external mesh and internal mesh
2, according to the tooth curve can be divided into: involute tooth form and cycloid
3, according to the form of the tooth surface can be divided into: straight tooth gear, helical tooth gear, herringbone tooth gear, the circular arc of the tooth surface of the gear
4, according to the number of gears meshing Sub: two gear type and multi-gear type
5, according to the number of gear stages can be divided into: single-stage gear pumps and multi-stage gear pumps
Baidu Encyclopedia - Gear Pumps