German casappa pump casappa model casappa price

casappa pumps are rotary pumps that rely on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. Two enclosed spaces are formed by two gears, the pump body, and the front and rear covers. When the gears rotate, the volume on the disengagement side increases from small to large, creating a vacuum that draws in the liquid, while the volume on the meshing side decreases from large to small, forcing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of a gear pump depends entirely on the resistance at the pump outlet.

casappa pump motor features

1) Compact structure, small size, and light weight: Composed of aluminum alloy front cover, intermediate body, and rear cover, alloy steel gears, and aluminum alloy pressure plates. 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; 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: Speed ranges from 3000 to 4000 rpm, with theoretical torque from 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, inlet, and outlet connections. Widely applicable in hydraulic systems of automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

casappa 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 '8' shape, with the two gears installed inside. The outer diameter of the gears and their sides fit closely with the housing. Material from the extruder enters the space between the two gears at the suction inlet, filling this space. As the teeth rotate, the material moves along the housing and is finally discharged when the two teeth mesh. Gear pumps are also known as positive displacement devices. 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. 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 continuously, the pump discharges fluid without interruption. 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 some fluid is used to lubricate the bearings and the sides of the gears, and the pump body cannot have a gap-free fit. Therefore, fluid cannot be discharged 100% from the outlet, making minor fluid loss inevitable. This prevents 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 changes in fluid viscosity or density during the process. If a damper, such as a filter 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 speed, which mainly depends on the process fluid. If oil is being transported, 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 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 price.

casappa pump trapped oil phenomenon

For a gear pump to operate smoothly, 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 enclosed cavity formed by these two pairs of teeth. This enclosed cavity gradually decreases in volume as the gears rotate, and then gradually increases. The reduction in cavity volume compresses the trapped oil, generating high pressure that forces oil out through gaps, causing heating and imposing extra loads on components. Conversely, the increase in cavity volume creates a local vacuum, causing dissolved gases in the oil to separate and creating cavitation. These effects produce strong vibration and noise, known as the trapped oil phenomenon in gear pumps. 1) Hazards: Large radial unbalanced forces can bend the shaft, cause contact between the gear tips and 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 enclosed 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 casappa gear pumps, casappa gear pumps, casappa diaphragm pumps, casappa centrifugal pumps, casappa piston pumps, casappa vacuum pumps, casappa screw pumps, casappa submersible pumps, casappa peristaltic pumps, casappa lubrication pumps, casappa vane pumps, casappa metering pumps, casappa hand pumps, casappa barrel pumps, casappa cam pumps, casappa booster pumps, casappa liquid pumps, casappa air pumps. Original imports from Germany. Welcome inquiries and orders from users.