German D+P pump D+P model D+P price

D+P pump is a rotary pump that transports liquids or increases their pressure by relying on the change and movement of the working volume formed between the pump cylinder and the meshing gears. It consists of two gears, a pump body, and front and rear covers, forming two enclosed spaces. When the gears rotate, the volume on the disengaging side increases from small to large, creating a vacuum to draw in liquid, while the volume on the meshing side decreases from large to small, squeezing 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.

D+P 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 installation flanges, shaft extensions, inlet, and outlet connections. Widely applicable in hydraulic systems of automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

D+P 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 and sides of the gears fit tightly 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 discharged when the 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 incompressible nature of the liquid means the liquid and the tooth cannot occupy the same space simultaneously, forcing the liquid out mechanically. 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 continuously. 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. Since the pump body cannot have a gap-free fit, it is impossible for the fluid to exit the outlet 100%. Therefore, minor fluid loss is inevitable, preventing the pump's operating efficiency from reaching 100%. However, the pump still 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 or restrictor, is placed on the discharge side, the pump will push the fluid through them. If the 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 pumping oil, the pump can rotate at high speeds, but this limit increases significantly when pumping high-viscosity polymer melts. 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.

D+P pump industry applications

Centrifugal pumps feature a compact structure, wide flow and head ranges, and are suitable for mildly corrosive liquids. They offer various control options, uniform flow, smooth operation, and low vibration, requiring no special vibration-damping foundations. Installation, maintenance, and repair costs are low. They are widely used in power generation, metallurgy, coal, building materials, and other industries for transporting slurries containing solid particles, such as hydraulic ash removal in thermal power plants, slurry transport in metallurgical concentrators, and coal slurry and heavy medium transport in coal washing plants. When operating a centrifugal pump, the pump must be placed on land with the suction pipe submerged in water, requiring priming before startup. Sludge pumps and submersible centrifugal pumps are structurally limited; the motor must be positioned above the water surface while the pump is submerged. They must be fixed securely; otherwise, the motor falling into the water will cause failure. Additionally, since the long shaft length is generally fixed, installation and use are more troublesome, limiting application scenarios.

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