German BAIER+KOPPEL pump BAIER+KOPPEL model BAIER+KOPPEL price

BAIER+KOPPEL pumps are rotary pumps that transport liquids or increase their pressure by changing and moving the working volume formed between the pump cylinder and meshing gears. Two enclosed spaces are formed by two gears, the pump body, and the front and rear covers. When the gears rotate, the volume of the space on the disengaging side increases from small to large, creating a vacuum that draws in liquid. The volume of the space on the meshing side decreases from large to small, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of the gear pump depends entirely on the resistance at the pump outlet.

BAIER+KOPPEL 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, which can greatly extend the service life of the gear pump. 2) Reliable operation: The pressure plate is the main component for radial and axial pressure compensation. It can reduce bearing load and automatically adjust 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 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, theoretical torque ranges from 17N.m (N.m) to 64N.m, and pressure can reach 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.

BAIER+KOPPEL pump working principle

The concept of a gear pump is 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 between the two gears at the suction inlet, filling this space. As the teeth rotate, the material moves along the housing and is 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, the liquid cannot occupy the same space as the tooth 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 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 because 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 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 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 (usually equipped with a torque limiter). There is actually a limit to the pump's speed, which mainly depends on the process fluid. If pumping oil, 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 capacity and price.

BAIER+KOPPEL pump trapped oil phenomenon

For stable operation of a gear pump, the contact ratio of gear meshing must be greater than 1, ensuring that two pairs of gears are always meshing simultaneously. A portion of the oil is trapped in the closed volume formed between these two pairs of teeth. This closed volume gradually decreases as the gears rotate, and then gradually increases. The reduction in the volume of the closed chamber compresses the trapped oil, generating high pressure and forcing it out through gaps, which causes the oil to heat up and imposes additional loads on components. Conversely, an increase in the volume of the closed chamber creates a local vacuum, causing dissolved gases in the oil to separate and resulting in cavitation. These effects produce 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 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 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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