What is the working principle of the gear pump?
2019-09-15 12:07:05
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What is the working principle of the gear pump?
Source: Bearing network time: 2014-04-08
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In terms of terms; a gear pump is also called a positive displacement device; that is, like a piston in a cylinder; when one tooth enters the fluid space of the other tooth; the liquid is mechanically squeezed out. Because the liquid is not tightened Therefore, the liquid and the teeth cannot occupy the same space at the same time; thus, the liquid is removed. Because the teeth are constantly meshed; this appearance is successively attacked; therefore, a continuous sweep amount is supplied at the pump outlet. The pump rotates one revolution; the discharge amount is the same. The drive shaft rotates uninterruptedly; the pump discharges the fluid without interruption. The pump flow is directly related to the pump speed.
In fact; there are very few fluid losses in the pump; this makes the pump's operating power not reach 100%; because these fluids are used to smooth the bearings and gears; and the pump body can never cooperate without gaps; The fluid is discharged 100% from the outlet; so a small amount of fluid loss is a must. But the pump is still able to operate outstandingly; for most extruded materials, it can still reach 93% to 98% of the power.
For fluids whose viscosity or density changes in the process; such pumps do not suffer too much. If there is a damper; for example, put a strainer or a restrainer on the discharge side; the pump will propel the fluid through them. If the damper changes during operation; that is, if the filter is dirty or blocked; or if the back pressure of the restraint is raised; then the pump will still adhere to a steady flow; until the machine reaches the weakest part of the machine Limit (generally equipped with a torque restraint).
Regarding the speed of a pump; it is actually constrained; this depends primarily on the process fluid; if it is oil, the pump can be converted at a very high speed; but when the fluid is a high viscosity polymer melt Body time; this constraint will drop dramatically.
It is very important to push the high-viscous fluid into the two-tooth space on the suction inlet side; if there is no filling overflow in this space, the pump cannot discharge the accurate flow rate; therefore, the PV value (pressure × flow rate) is another constraint element; And it's a process variable. Because of these constraints; the gear pump manufacturer will supply a range of products; that is, different standards and displacements (the amount discharged per revolution). These pumps will work with the detailed process; Make the system talent and price reach the best.
The gear and shaft of the PEP-II pump are integrated; the whole body hardening process is adopted; the longer working life can be obtained. The "D" type bearing is connected with the forced smoothing mechanism; the polymer is passed through the bearing appearance; and returned to the pump. The inlet side; to ensure the useful smoothness of the rotating shaft. This feature reduces the ability of the polymer to stay and degrade. The finely machined pump body can accurately cooperate with the "D" bearing and the gear shaft; ensure that the gear shaft does not hurt; Anti-gear wear. The Parkool seal layout together with the PTFE lip seal forms a water-cooled seal. This seal does not actually touch the appearance of the shaft; its sealing principle is to cool the polymer to a semi-molten condition to form a self-sealing. Rheoseal seals are available; it has a reverse spiral groove on the inside of the shaft seal; the polymer can be back pressured back to the inlet. For ease of installation; the manufacturer has depicted an annular bolt face; Flange devices work together; this makes the production of cylindrical flanges simpler.
The PEP-II gear pump has a heating element that matches the pump's standard; it can be selected by the user; this ensures a fast heating and heat control. It is different from the heating method in the pump body; the damage of these components is limited to one board. Up; not related to the entire pump.
The gear pump is driven by a separate motor; it can effectively block upstream pressure pulsation and flow fluctuation. The pressure pulsation at the gear pump outlet can be controlled within 1%. Select a gear pump on the extrusion line; Can improve the flow output speed; reduce the shear and residence time of the material in the extruder; reduce the extrusion temperature and pressure pulsation to improve productivity and product quality.
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