| Customization: | Available |
|---|---|
| Warranty: | 6 Months |
| Type: | Hydraulic Accumulators |
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Product Description/Features:
Gear pump is a rotary pump that depends on the working volume change and movement formed between the pump cylinder and the meshing gear to transport liquid or pressurize it. Composed of two gears, the pump body and the front and back cover of two closed Spaces, when the gear rotates, the volume of the space on the side of the gear off from small to large, forming a vacuum, the liquid inhalation, the volume of the space on the gear meshing side from large to small, and the liquid squeezed into the pipeline. The suction cavity and the discharge cavity are separated by the meshing lines of the two gears. The pressure at the outlet of the gear pump depends entirely on the resistance at the pump outlet.
The concept of gear pump is very simple, its most basic form is two gears of the same size in a closely matched housing meshing rotation, the interior of the housing similar to the "8" shape, two gears installed inside, the outer diameter of the gear and both sides of the housing closely matched. The material from the extruder enters the middle of the two gears at the suction inlet and fills this space, moving along the housing with the rotation of the teeth, and finally discharging when the two teeth mesh. In terminology, gear pumps are also called positive displacement devices, that is, like a piston in a cylinder, when a tooth enters the fluid space of another tooth, because the liquid is incompressible, the liquid and the tooth can not occupy the same space at the same time, so that the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, and thus provides a continuous exclusion at the outlet of the pump, and the amount of discharge is the same with each turn of the pump. With the continuous rotation of the drive shaft, the pump continues to discharge fluid. Pump flow is directly related to pump speed. In fact, there is a very small amount of fluid loss in the pump, because these fluids are used to lubricate the bearing and both sides of the gear, and the pump body can never be matched without a gap, so the fluid can not be 100% discharged from the outlet, so a small amount of fluid loss is inevitable, which makes the pump operating efficiency can not reach 100%. However, the pump still works well and can still achieve 93% to 98% efficiency for most extruded materials. Gear pump For fluids with viscosity or density changes in the process, this pump will not be much affected. If there is a damper, such as a filter or a limiter on the side of the discharge outlet, the pump will push the fluid through them. If this damper changes during operation, that is, if the screen becomes dirty, clogged, or the back pressure of the limiter increases, the pump will maintain a constant flow until the mechanical limit of the weakest part of the device is reached (usually with a torque limiter). The speed of a pump is actually limited, depending on the process fluid. If oil is delivered, the pump can turn at a very high speed, but when the fluid is a high viscosity polymer melt, this limit is greatly increased. It is very important to push the viscous fluid into the two-tooth space on the suction side. If this space is not filled, the pump cannot discharge the exact flow rate, so the PV value (pressure x flow rate) is another limiting factor and a process variable. Because of these limitations, gear pump manufacturers will offer a range of products, that is, different specifications and displacement (the amount of discharge per revolution). These pumps will be tailored to specific application processes to optimize system capabilities and prices. Gear pump PEP-II pump gear and shaft are integrated, using the whole body hardening process, to obtain a longer working life. The "D" bearing incorporates a forced lubrication mechanism that allows the polymer to pass through the bearing surface and return to the inlet side of the pump to ensure effective lubrication of the rotating shaft. This property reduces the likelihood of polymer retention and degradation. The precision machined pump body allows the "D" bearing to match the gear shaft precisely, ensuring that the gear shaft is not eccentric to prevent gear wear. The Parkool seal structure and the PTFE lip seal together form 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-sealing. It can also be sealed with Rheoseal, which has a reverse spiral groove machined on the inner surface of the shaft seal, allowing the polymer to be reversed pressed back into the inlet. For ease of installation, the manufacturer has designed a ring bolt mounting surface to fit with the flange mounting of other equipment, which makes the manufacture of barrel flanges easier. The PEP-II gear pump comes with a heating element matching the pump specifications, which can be selected by the user, which guarantees rapid heating and heat control. Unlike the way the pump is heated, the damage to these components is limited to one board and is not related to the entire pump.
The gear pump is driven by an independent motor, which effectively blocks upstream pressure pulsations and flow fluctuations. The pressure pulsation at the outlet of the gear pump can be controlled within 1%. The use of a gear pump in the extrusion line can increase the flow output speed and reduce the shear and residence time of the material in the extruder.
External gear pump is the most widely used gear pump, the general gear pump usually refers to the external gear pump. Its structure is shown in Figure 1, which is mainly composed of driving gear, driven gear, pump body, pump cover and safety valve. The seal space composed of the pump body, pump cover and gear is the workshop of the gear pump. The shafts of the two gears are respectively installed in the bearing holes on the two pump covers, and the driving gear shaft extends out of the pump body and is driven by the motor to rotate. External gear pump has simple structure, light weight, low cost, reliable operation and wide application range.
When the gear pump works, the driving wheel rotates with the motor and drives the driven wheel to rotate. When the meshing teeth on one side of the suction chamber gradually separate, the volume of the suction chamber increases, the pressure decreases, and the liquid in the suction tube is sucked into the pump; The suction liquid is pushed to the discharge chamber by the gear in two ways in the tooth groove. After the liquid enters the discharge chamber, the teeth of the two gears continue to mesh, so that the liquid is squeezed from the discharge chamber into the discharge pipe. The driving gear and driven gear keep rotating, and the pump can continuously suck in and discharge liquid.
The pump body is equipped with a safety valve, when the discharge pressure exceeds the specified pressure, the conveying liquid can automatically open the safety valve, so that the high-pressure liquid returns to the suction pipe.
The internal gear pump is composed of a pair of internal gears meshing with each other and a crescent shaped part between them, a pump shell, etc. The function of the crescent is to separate the suction chamber from the discharge chamber. When the driving gear rotates, the local vacuum is formed at the place where the gear is off the mesh, and the liquid is sucked into the pump and filled with the teeth of the suction chamber, and then enters the discharge chamber along the inner and outer sides of the crescent piece in two ways. At the point where the teeth enter engagement, the liquid present between the teeth is squeezed into the discharge tube.
Gear pump in addition to the characteristics of self-priming capacity, flow and discharge pressure independent, pump shell without suction valve and discharge valve, with simple structure, uniform flow, reliable work and other characteristics, but low efficiency, noise and vibration, easy to wear, mainly used to transport non-corrosive, no solid particles and lubrication ability of various oils, the temperature generally does not exceed 70 ºC, Such as lubricating oil, edible vegetable oil, etc. The general flow range is 0.045 ~ 30ms/h, the pressure range is 0.7-20mpa, and the working speed is 1200-4000r /min.
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Name |
Gear Pump |
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Brand |
OEM |
|
Model |
OEM |
|
Color |
silver etc |
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Material |
cast iron |
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Warranty |
6 months |
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lead time |
5-8 working days |
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Package |
Carton packing |
Company Profile
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