Internal and external gear pump structure advantages

Gear pump according to the gear or rotor meshing mode is divided into internal gear pump and external gear pump meshing.

External gear pump refers to the gear pump composed of external gear, the shaft of two gears are respectively installed in the bearing hole on the two pump cover, the active gear shaft extends out of the pump body, driven by the motor rotation.

External Gear Pump

Internal gear pump is the use of gear meshing principle, internal and external gear section circle close to one side, the other side of the pump cover “crescent plate” separated. The active inner gear on the spindle drives the middle and outer gears to rotate in the same direction. At the inlet, the gears are separated from each other to form negative pressure and suck in the liquid. At the outlet, the gears are constantly embedded in meshing to squeeze the liquid out. Internal gear pump is also called high viscosity pump according to the characteristics of the material pumped.

External gear pump structure:

The external kcb gear pump is mainly composed of a pair of bearing supported gears and housing, front cover, rear cover, etc., the rotor turns in the opposite direction. The drive shaft extends out of the front cover and is sealed by the shaft seal.

External engagement also ensures good wear resistance, especially at low speeds. An internal seal is achieved with a compression force proportional to the pressure of the oil release, thus ensuring optimum efficiency.

Internal gear pump structure:

Internal gear pump is composed of front cover, inner rotor, outer rotor, pump body, spindle, machine seal, bearing and other components. When conveying crystallizable medium, heat preservation jacket can be designed on the front cover and pump body, which can be melted by steam insulation when working.

The outer rotor has the function of driving the inner rotor, turning the same, the pump body and the front cover of the crescent plate so that the suction inlet and discharge outlet separated, rotating suction inlet formed negative pressure, liquid is inhaled, the rotor will be liquid to discharge outlet, pressure discharge pump body, complete the delivery of liquid.

Advantages of external gear pump:

Simple structure, small size and mass, convenient manufacturing, low cost, reliable work, strong self-priming ability, not sensitive to oil pollution, easy maintenance. Suitable for conveying similar lubricating oil materials with viscosity less than 1500 Reese.

Advantages of internal gear pump:

Liquid transportation is stable, no pulsation, small vibration, low noise; Have strong self-priming performance; The operating temperature can reach 200℃; The inner and outer rotors have the same steering, small wear and long service life. Especially suitable for conveying medium with high viscosity, the viscosity can transport 600,000 rees.

Different media and working conditions, the choice of pump type is different, in the selection can provide detailed medium characteristics and working conditions, Hebei Hengsheng pump industry will have senior engineers to choose the right pump for you.