German Watson Marlow pump, Watson Marlow model, Watson Marlow price

The most basic form of the Watson Marlow pump consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles the shape of an "8", with the two gears installed inside; the outer diameters and sides of the gears fit tightly against the housing. Material from the extruder enters between the two gears at the suction inlet, fills this space, moves along the housing as the teeth rotate, and is finally discharged when the teeth mesh.

Watson Marlow pump motor features

1) Compact structure, small size, and light weight: Composed of front cover, intermediate body, and rear cover made of aluminum alloy, gears made of alloy steel, and pressure plates made of aluminum alloy. Two DU bearings are press-fitted into the front and rear covers respectively. DU material is an ideal bearing material for gear pumps, significantly extending the service life of the gear pump. 2) Reliable operation: The pressure plate is the main component for radial and axial pressure compensation, reducing bearing load and automatically adjusting the axial clearance of the gear pump, thereby effectively improving performance indicators and operational reliability. The GM5 and GPC4 series gear motors offer four structural configurations: single rotation without front bearing, double rotation without front bearing, single rotation with front bearing, and double rotation with front bearing. Gear motors with front bearings can withstand both radial and axial forces. 3) High speed and high pressure: Rotational speed ranges from 3000 to 4000 rpm, with theoretical torque from 17N.m (N.m) to 64N.m, reaching pressures up to 20-25MPa. 4) Connection methods suitable for imported machinery and engineering equipment: Complies with SAE and national standard GB for mounting flanges, shaft extensions, and inlet/outlet port connections. Widely applicable in hydraulic systems for automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

Watson Marlow pump working principle

The concept of a gear pump is straightforward. Its most basic form consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles the shape of an "8", with the two gears installed inside; the outer diameters and sides of the gears fit tightly against the housing. Material from the extruder enters between the two gears at the suction inlet, fills this space, moves along the housing as the teeth rotate, and is finally discharged when the teeth mesh. A gear pump is also known as a positive displacement device. Similar to a piston in a cylinder, when one tooth enters the fluid space of another tooth, the liquid and the tooth cannot occupy the same space simultaneously because the liquid is incompressible. Consequently, the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume per revolution remains constant. As the drive shaft rotates uninterrupted, the pump discharges fluid without interruption. The pump's flow rate is directly related to its rotational speed. In practice, there is a small amount of fluid loss within the pump, as some fluid is used to lubricate the bearings and the sides of the gears. Furthermore, since the pump body cannot have a gap-free fit, it is impossible for the fluid to be discharged 100% from the outlet. Therefore, minor fluid loss is inevitable, preventing the pump's operating efficiency from reaching 100%. However, the pump can still operate effectively, achieving efficiencies of 93% to 98% for most extruded materials. This pump is minimally affected by changes in fluid viscosity or density during the process. If a damper, such as a filter screen or restrictor, is placed on the discharge side, the pump will push the fluid through them. If the damper changes during operation—for instance, if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump will maintain a constant flow rate until the mechanical limit of the weakest component in the system is reached (a torque limiter is usually installed). There is actually a limit to the rotational speed of a pump, which primarily depends on the process fluid. If pumping oil, the pump can rotate at high speeds; however, if the fluid is a high-viscosity polymer melt, this limitation increases significantly. It is crucial to fill the space between the two teeth on the suction side with high-viscosity fluid. If this space is not fully filled, the pump cannot discharge an accurate flow rate. Therefore, the PV value (pressure × flow velocity) is another limiting factor and a process variable. Due to these limitations, gear pump manufacturers offer a range of products with different specifications and displacements (volume discharged per revolution). These pumps are matched to specific application processes to optimize system capacity and cost.

Watson Marlow pump trapped oil phenomenon

For stable operation of a gear pump, the contact ratio of gear meshing must be greater than 1, meaning two pairs of gears are always meshing simultaneously. A portion of the oil is trapped in the closed cavity formed between these two pairs of teeth. As the gears rotate, the volume of this closed cavity first decreases gradually and then increases. The reduction in cavity volume compresses the trapped oil, generating high pressure that forces the oil out through gaps, causing heating and imposing additional loads on components. Conversely, the increase in cavity volume creates a local vacuum, causing dissolved gases in the oil to separate and resulting in cavitation. These effects produce intense vibration and noise, known as the trapped oil phenomenon in gear pumps. 1) Hazards: Significant radial unbalanced forces can cause shaft bending, contact between gear tips and the housing, accelerated bearing wear, and reduced bearing life. 2) Elimination method: To eliminate trapped oil, relief grooves are typically machined into the side cover plates. When the closed cavity volume decreases, it connects to the pressure chamber via the left relief groove; when the volume increases, it connects to the suction chamber via the right relief groove.

Weidou Intelligent Technology specializes in selling German Watson Marlow gear pumps, Watson Marlow gear pumps, Watson Marlow diaphragm pumps, Watson Marlow centrifugal pumps, Watson Marlow piston pumps, Watson Marlow vacuum pumps, Watson Marlow screw pumps, Watson Marlow submersible pumps, Watson Marlow peristaltic pumps, Watson Marlow lubrication pumps, Watson Marlow vane pumps, Watson Marlow metering pumps, Watson Marlow hand pumps, Watson Marlow drum pumps, Watson Marlow lobe pumps, Watson Marlow booster pumps, Watson Marlow liquid pumps, and Watson Marlow air pumps. All products are original imports from Germany. Customers are welcome to inquire and place orders.