SHIMADZU Gear Pump FT3-602011R681 Hitachi LX70-7 LX70-5 Loader FT3661616R042

The concept of a gear pump is very simple, that is, its most basic form is that two gears of the same size mesh and rotate with each other in a tightly matched housing. The interior of this housing is similar to an "8" shape, with two gears installed inside, and the outer diameter and sides of the gears are tightly matched with the housing. The material from the extruder enters the middle of two gears at the suction port and fills this space. It moves along the shell with the rotation of the teeth and is finally discharged when the two teeth mesh.

In terminology, gear pumps, also known as positive displacement devices, are like pistons in a cylinder barrel. When one tooth enters the fluid space of another tooth, the liquid is mechanically squeezed out. Because liquid is incompressible, liquid and teeth cannot occupy the same space at the same time, which eliminates the liquid. Due to the continuous meshing of teeth, this phenomenon occurs continuously, providing a continuous discharge at the outlet of the pump. The discharge amount is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump continuously discharges fluid. The flow rate of the pump is directly related to the pump speed.

In fact, there is a small amount of fluid loss inside the pump, which makes the operating efficiency of the pump unable to reach 100%, because these fluids are used to lubricate both sides of the bearings and gears, and the pump body can never fit without gaps, so it cannot discharge the fluid 100% from the outlet, so a small amount of fluid loss is inevitable. However, the pump can still operate well and can still achieve an efficiency of 93% to 98% for most extruded materials.

For fluids with varying viscosity or density in the process, this type of pump will not be greatly affected. If there is a damper, such as a filter screen or a limiter placed on the discharge side, the pump will push the fluid through them. If the damper changes during operation, that is, if the filter screen becomes dirty, blocked, or the back pressure of the limiter increases, the pump will still maintain a constant flow rate until it reaches the mechanical limit of the weakest component in the device (usually equipped with a torque limiter).

There is actually a limit to the speed of a pump, which mainly depends on the process fluid. If oil is being transported, the pump can rotate at a high speed. However, when the fluid is a high viscosity polymer melt, this limit will be greatly reduced.

It is very important to push the highly viscous fluid into the two tooth space on the suction side. If this space is not fully filled, the pump cannot discharge accurate flow, so the PV value (pressure × Flow rate is also another limiting factor and a process variable. Due to these limitations, gear pump manufacturers will provide a range of products with different specifications and displacement (the amount discharged per revolution). These pumps will be combined with specific application processes to achieve optimal system capacity and price.

Shimadzu gear pumps are widely used as hydraulic sources in forklifts and industrial vehicles with lifting functions, construction machinery, special vehicles, and agricultural machinery.

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