German Dopag pump Dopag model Dopag price

Dopag pumps are rotary pumps that transport liquids or increase their pressure by relying on the change and movement of the working volume formed between the pump cylinder and the 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 the liquid. The volume of the space on the meshing side decreases from large to small, squeezing 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 magnitude of the resistance at the pump outlet.

Dopag pump motor features

1) Compact structure, small size, and light weight: Composed of an aluminum alloy front cover, intermediate body, and rear cover, along with components such as 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. It reduces bearing load and automatically adjusts 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, dual rotation direction without front bearing, single rotation direction with front bearing, and dual rotation direction with front bearing. Gear motors equipped with front bearings can withstand both radial and axial forces. 3) High speed and high pressure: High speed ranging from 3000 to 4000 rpm, with a theoretical torque of 17N.m (N.m) to 64N.m, capable of reaching 20-25MPa. 4) Connection methods suitable for imported machinery and engineering equipment: Complies with SAE and national standard GB for installation flanges, shaft extensions, and inlet/outlet port connections. Widely applicable to hydraulic systems in automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

Dopag 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 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. Consequently, 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 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. Furthermore, it is impossible for the pump body to have a gap-free fit, so the fluid cannot be discharged from 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 changes in fluid viscosity or density during the process. If a damper, such as a filter screen or a 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 screen 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 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 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.

Dopag 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. No special vibration-damping foundation is required. Advantages include low costs for equipment installation, maintenance, and overhaul. They are widely used in industries such as electric power, metallurgy, coal, and building materials to transport slurries containing solid particles. Applications include hydraulic ash removal in thermal power plants, slurry transport in metallurgical beneficiation plants, and coal slurry and heavy medium transport in coal washing plants. When a centrifugal pump operates, it must be placed on land, with the suction pipe submerged in water, and requires priming before startup. Sludge pumps and submersible centrifugal pumps are structurally limited; during operation, the motor must be positioned above the water surface while the pump is submerged. Therefore, they must be fixed; otherwise, if the motor falls into the water, it will be scrapped. Moreover, since the long shaft length is generally fixed, pump installation and use are more troublesome, and application scenarios are subject to many restrictions.

Weidou Intelligent Technology specializes in the sales of German Dopag metering pumps, Dopag gear pumps, Dopag diaphragm pumps, Dopag centrifugal pumps, Dopag piston pumps, Dopag vacuum pumps, Dopag screw pumps, Dopag submersible pumps, Dopag peristaltic pumps, Dopag lubrication pumps, Dopag vane pumps, Dopag metering pumps, Dopag hand pumps, Dopag drum pumps, Dopag cam pumps, Dopag booster pumps, Dopag liquid pumps, and Dopag air pumps. Original imports from Germany. Welcome customers to inquire and order.