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The basic concept of gear pump
Views: 762 Update Date: Feb 17 , 2017

The concept of the gear pump is very simple, that is, its most basic form is the same size of the two gears in a tight fit with the internal rotation of the shell, the shell of the internal similar to the "8" shape, two gears installed inside . The outer diameter of the gear and the two sides with the shell closely. The material from the extruder enters the middle of the two gears at the suction port and fills the space, moving along the housing as the teeth rotate, and finally discharging when the teeth are engaged.

In the terminology, the gear pump is also called the positive displacement device, that is, like a piston in a cylinder, when a tooth into the other tooth of the fluid space, the liquid was mechanically squeezed out. Because the liquid is incompressible, so the liquid and teeth can not occupy the same space at the same time, so that the liquid is excluded. As the teeth continue to engage, this phenomenon occurs continuously, and thus also provides a continuous exclusion of the pump outlet, the amount of each turn of the pump, the amount of discharge is the same. As the drive shaft rotates uninterrupted, the pump also discharges the fluid without interruption. The pump flow is directly related to the pump speed.

In fact, there is a small amount of fluid loss in the pump, which makes the pump operating efficiency can not reach 100%, because these fluids are used to lubricate both sides of the bearing and gear, and the pump can not be no gap with It is not possible to discharge the fluid 100% from the outlet, so a small amount of fluid loss is inevitable. However, the pump can still run well, for most of the extrusion material, can still achieve 93% to 98% efficiency.

For pumps with varying viscosities or densities in the process, this pump will not be affected too much. If there is a damper, such as a filter or a limiter on the discharge side, the pump will push the fluid through them. If the damper changes during operation, that is, if the screen becomes dirty, clogged, or the back pressure of the limiter rises, the pump will maintain a constant flow until the mechanical limit of the weakest part in the device is reached (Usually fitted with a torque limiter).

The speed of a pump is actually limited, depending on the process fluid. If the oil is delivered, the pump can rotate at a high speed, but when the fluid is a high viscosity polymer melt Body, this restriction will be greatly reduced.

It is very important to push the two-tooth space into which the high-viscosity fluid enters the suction port side. If the space is not filled, the pump can not discharge the exact flow rate, so the PV value (pressure x flow rate) is another limiting factor, and Is a process variable. Because of these limitations, gear pump manufacturers will provide a range of products, that is, different specifications and displacement (the amount of discharge per week). These pumps will work with specific application processes to optimize system capacity and price.

PEP-II pump gear and shaft together, using the whole body hardening process, get a longer working life. The "D" bearing incorporates a forced lubrication mechanism to allow the polymer to pass through the bearing surface and return to the inlet side of the pump to ensure effective lubrication of the rotary shaft. This feature reduces the possibility of polymer retention and degradation. Precision machining of the pump can be "D" type bearing and gear shaft with the exact, to ensure that the gear shaft is not eccentric, to prevent gear wear. The Parkool seal structure together with the polytetrafluoro lip seal forms a water-cooled seal. This seal does not actually touch the surface of the shaft, and its sealing principle is to cool the polymer to a semi-molten state to form a self-seal. It can also be a Rheoseal seal, which has a reverse helical groove on the inner surface of the shaft seal, which allows the polymer to be pressed back to the inlet. For ease of installation, the manufacturer has designed a ring-shaped bolt mounting surface to match the flange mounting of other equipment, which makes the manufacture of the cylindrical flange easier.

PEP-II gear pump with a pump to match the specifications of the heating element, available for users to choose, which can guarantee fast heating and heat control. Unlike the heating in the pump body, the damage to these components is limited to one board, independent of the entire pump.

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