German VIVOLO pump VIVOLO model VIVOLO price

The most basic form of the VIVOLO pump consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles a figure "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 two teeth mesh.

VIVOLO pump motor features

1) Compact structure, small volume, light weight: Composed of a front cover, intermediate body, and rear cover made of aluminum alloy, gears made of alloy steel, and pressure plates made of aluminum alloy, among other components. Two DU bearings are press-fitted into the front and rear covers respectively. DU material is the 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 the performance indicators and operational reliability of the gear pump. 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, high pressure: High speed 3000~4000 rpm, theoretical torque 17N.m (N.m) to 64N.m, reaching 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.

VIVOLO pump working principle

The concept of a gear pump is very simple. 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 a figure "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 two teeth mesh. A gear pump is also known as a positive displacement device. Like 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. Thus, 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 is constant. As the drive shaft rotates uninterrupted, the pump discharges fluid uninterrupted. The pump flow rate is directly related to the pump speed. In practice, there is a small amount of fluid loss within the pump, as this fluid is used to lubricate the bearings and the sides of the gears. Since the pump body cannot have a gap-free fit, it is impossible for the fluid to exit the outlet 100%. Therefore, a small amount of fluid loss is inevitable, preventing the pump's operating efficiency from reaching 100%. However, the pump can still operate well, achieving an efficiency of 93% to 98% for most extruded materials. This pump is not significantly affected by fluids with varying viscosity or density in 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 this damper changes during operation—i.e., if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump will maintain a constant flow 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 pump's speed, which mainly depends on the process fluid. If oil is being transferred, the pump can rotate at high speeds, but this limit increases significantly when the fluid is a high-viscosity polymer melt. It is crucial to fill the space between the two teeth on the suction inlet 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 capability and price.

VIVOLO pump trapped oil phenomenon

For stable operation of a gear pump, the contact ratio of gear meshing must be greater than 1, meaning that two pairs of gears are always meshing simultaneously, trapping a portion of oil in the closed cavity formed by the two pairs of teeth. This closed cavity gradually decreases in volume as the gears rotate, then gradually increases. The reduction in closed cavity volume compresses the trapped oil, generating high pressure and forcing it out through gaps, causing the oil to heat up and imposing additional loads on components. Conversely, an increase in closed cavity volume creates a local vacuum, causing dissolved gases in the oil to separate and produce cavitation. These effects generate strong vibration and noise, known as the trapped oil phenomenon in gear pumps. 1) Hazards: Significant radial unbalanced forces can cause shaft bending, contact between the 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 VIVOLO gear pumps, VIVOLO gear pumps, VIVOLO diaphragm pumps, VIVOLO centrifugal pumps, VIVOLO piston pumps, VIVOLO vacuum pumps, VIVOLO screw pumps, VIVOLO submersible pumps, VIVOLO peristaltic pumps, VIVOLO lubrication pumps, VIVOLO vane pumps, VIVOLO metering pumps, VIVOLO hand pumps, VIVOLO drum pumps, VIVOLO cam pumps, VIVOLO booster pumps, VIVOLO liquid pumps, VIVOLO air pumps. Original imports from Germany. Welcome inquiries and orders from users.