German MENCARELLI POMPE pump, MENCARELLI POMPE model, MENCARELLI POMPE price

The most basic form of the MENCARELLI POMPE 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 the number "8", with the two gears installed inside; the outer diameter 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.

MENCARELLI POMPE pump motor features

1) Compact structure, small size, 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 direction without front bearing, double rotation direction without front bearing, single rotation direction with front bearing, and double rotation direction 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, oil inlet, and oil outlet connections. Widely applicable in hydraulic systems for automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

MENCARELLI POMPE 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 the number "8", with the two gears installed inside; the outer diameter 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, the incompressibility of the liquid prevents the liquid and the tooth from occupying the same space simultaneously, mechanically forcing the liquid 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. Pump flow rate is directly related to pump speed. In practice, there is minimal fluid loss within the pump, as some fluid is used to lubricate the bearings and gear sides, and perfect zero-clearance fitting of the pump body is impossible. Therefore, fluid cannot be discharged 100% from the outlet, making minor fluid loss inevitable. Consequently, the pump's operating efficiency cannot reach 100%. However, the pump operates well, 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 pushes the fluid through them. If the damper conditions change during operation—i.e., if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump maintains constant flow until reaching the mechanical limit of the weakest component in the system (typically equipped with a torque limiter). There is actually a limit to the pump's rotational speed, primarily depending 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 fully fill the space between the two teeth on the suction side with high-viscosity fluid; if this space is not completely filled, the pump cannot deliver accurate flow. 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.

MENCARELLI POMPE 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, trapping a portion of oil in the closed chamber formed between them. The volume of this closed chamber gradually decreases and then increases as the gears rotate. The reduction in chamber volume compresses the trapped oil, generating high pressure that forces oil through gaps, causing heating and additional load on components. Conversely, the increase in chamber volume creates a local vacuum, causing dissolved gases in the oil to separate and create cavitation. These effects produce strong vibration and noise, known as the trapped oil phenomenon in gear pumps. 1) Hazards: Significant radial unbalanced forces can bend the shaft, cause gear tips to contact the housing, accelerate bearing wear, and reduce bearing life. 2) Elimination method: To eliminate trapped oil, relief grooves are typically machined into the side cover plates. When the closed chamber volume decreases, it connects to the pressure outlet chamber via the left relief groove; when the volume increases, it connects to the suction inlet chamber via the right relief groove.

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