The most basic form of the
Gear Pump is that two identically sized gears mesh with each other in a tightly fitting housing. The interior of the gear pump housing resembles an "8" shape. The two gears are mounted on the outer diameter of the inner gear and on both sides and the shell. Close cooperation.
The most basic form of the gear pump is that two identically sized gears mesh with each other in a tightly fitting housing. The interior of the gear pump housing resembles an "8" shape. The two gears are mounted on the outer diameter of the inner gear and on both sides and the shell. The body is closely matched. The material from the extruder enters the middle of the two gears at the suction port and fills this space. As the tooth rotates along the housing, it finally discharges when the two teeth mesh.
In terms of terms, a gear oil pump is also called a positive displacement device. When one tooth enters the fluid space of another tooth, the liquid is mechanically squeezed out. Because the liquid is incompressible, the liquid and the tooth cannot occupy at the same time. In the same space, the liquid is removed. The phenomenon of continuous meshing of the teeth occurs continuously, thus providing a continuous discharge at the outlet of the pump. The amount of discharge per revolution of the pump is the same. With the uninterrupted rotation of the drive shaft, the pump discharges the fluid without interruption. The flow rate of the pump is directly related to the speed of the pump.
In fact, the gear oil pump has 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 the bearings and gears on both sides, and the pump body can never be fit without gaps. Therefore, the fluid cannot be discharged 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.
Gear pump For fluids whose viscosity or density varies in the process, the pump will not be affected too much. If there is a damper such as a strainer or a limiter on the discharge side, the pump will push the fluid through them. If the damper changes during operation, ie if the filter is dirty, clogged or the back pressure of the limiter increases, the pump will still maintain a constant flow until it reaches the mechanical limit of the weakest part of the device (usually Equipped with a torque limiter).
There is actually a limit to the speed of the gear pump, which depends mainly on the process fluid. If the oil pump is delivered, it can rotate at a very high speed. When the fluid is a high viscosity polymer melt. The limit will be greatly reduced.
It is very important to push the high-viscous fluid into the two-tooth space on the side of the suction port. If this space is not filled, the pump cannot discharge the accurate flow rate, so the PV value (pressure × flow rate) is another limiting factor and A process variable. Due to these limitations, the gear pump manufacturer will offer a range of products, ie different sizes and displacements (amounts discharged per revolution). These pumps will be matched to the specific application process to enable system capacity and price. Reach the best.
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China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
May 27, 2019