German JESCO pump JESCO model JESCO price

JESCO pumps are also known as positive displacement devices, acting like a piston within a cylinder. When a tooth enters the fluid space of another tooth, the liquid and the tooth cannot occupy the same space simultaneously because liquids are 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 is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump's rotational speed.

JESCO 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 the performance indicators and operational reliability of the gear pump. 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, inlet, and outlet connections. Widely applicable to hydraulic systems in automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

JESCO 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 an '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, acting like a piston within a cylinder. When a tooth enters the fluid space of another tooth, the liquid and the tooth cannot occupy the same space simultaneously because liquids are 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 is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump's 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. Since the pump body cannot have a gap-free fit, it is impossible for the fluid to be discharged 100% from the outlet. 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 efficiencies 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 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 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 mainly depends on the process fluid. If oil is being transported, 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 price.

JESCO 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. A portion of the oil is trapped in the closed cavity formed by these two pairs of teeth. This closed cavity gradually decreases in volume as the gears rotate, and then gradually increases. The reduction in the volume of the closed cavity compresses the trapped oil, generating high pressure. The oil is squeezed out through gaps, causing heating and imposing additional loads on components. Conversely, the increase in the volume of the closed cavity 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: Large 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: The usual method to eliminate trapped oil is to machine relief grooves on the side plates. When the volume of the closed cavity decreases, it connects to the pressure chamber through the left relief groove; when the volume increases, it connects to the suction chamber through the right relief groove.

Weidou Intelligent Technology specializes in selling German JESCO diaphragm pumps, JESCO gear pumps, JESCO diaphragm pumps, JESCO centrifugal pumps, JESCO piston pumps, JESCO vacuum pumps, JESCO screw pumps, JESCO submersible pumps, JESCO peristaltic pumps, JESCO lubrication pumps, JESCO vane pumps, JESCO metering pumps, JESCO hand pumps, JESCO drum pumps, JESCO lobe pumps, JESCO booster pumps, JESCO liquid pumps, JESCO air pumps. Original imports from Germany. Welcome inquiries and orders from users.