German schmalz pump schmalz model schmalz price

schmalz pump is a rotary pump that relies 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. It consists of two gears, a pump body, and front and rear covers, forming two enclosed spaces. 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, while the volume of the space 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 the gear pump depends entirely on the magnitude of the resistance at the pump outlet.

schmalz 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, which 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 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: 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 installation flanges, shaft extensions, oil inlet, and oil outlet connections. Widely applicable to hydraulic systems in automobiles, tractors, engineering machinery, agricultural machinery, and other mechanical equipment.

schmalz 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 between the two gears at the suction inlet and fills this space. As the teeth rotate, the material moves along the housing and is finally discharged when the two teeth mesh. A gear pump is also known as a positive displacement device. 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. With each revolution of the pump, the discharged volume remains the same. 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, the fluid cannot 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 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 there is a damper, such as a filter screen or a restrictor 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 (usually equipped with a torque limiter). 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, when the fluid is a high-viscosity polymer melt, this limit 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.

schmalz pump trapped oil phenomenon

For a gear pump to operate smoothly, the contact ratio of the gear meshing must be greater than 1. Consequently, there are always two pairs of gears 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 the volume of the enclosed cavity compresses the trapped oil, generating high pressure. The oil is squeezed out through gaps, causing heating and imposing additional loads on the components. Conversely, the increase in the volume of the enclosed cavity 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 the 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 volume of the enclosed cavity decreases, it connects to the pressure oil chamber through the left relief groove. When the volume increases, it connects to the suction oil chamber through the right relief groove.

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