German LEADER pump LEADER model LEADER price

LEADER pumps are rotary pumps that rely on the change and movement of the working volume formed between the pump cylinder and meshing gears to transport liquids or increase their pressure. Two enclosed spaces are formed by two gears, the pump body, and the front and rear covers. When the gears rotate, the volume on the disengaging side increases from small to large, creating a vacuum that draws in the liquid, while the volume 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 a gear pump depends entirely on the resistance at the pump outlet.

LEADER pump operating 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 teeth mesh. Gear pumps are also known as positive displacement devices. Like a piston in a cylinder, when one tooth enters the fluid space of another, the incompressible nature of the liquid means that the liquid and the tooth cannot occupy the same space simultaneously, so 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, and the pump body cannot have a gap-free fit. Therefore, fluid cannot be discharged from the outlet 100%, making some fluid loss inevitable. This prevents 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 type of 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 restrictor at 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 speed of a pump, which mainly depends on the process fluid. If oil is being transported, 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 completely 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 capability and price.

LEADER pump usage precautions

Gear pumps are suitable for various industries and handle a wide range of media. These gear pumps offer advantages such as robust construction, easy installation, simple disassembly, straightforward maintenance, uniform and continuous flow, minimal wear, and long service life. 1) During the use of gear pumps, frequent greasing is required because lubricating grease evaporates easily; therefore, attention must be paid to replenishment and replacement, and cleanliness at the bearings must be maintained. 2) When using or after using the electric oil extraction pump, place it in a relatively dry, non-corrosive, and clean environment. 3) During the use of gear pumps, regular inspection and maintenance are necessary. Check the electric oil drum, including the power cord, internal wiring, plug, and switch, to ensure they are functioning normally. Inspect bearing components for any damage. 4) Preserve every component of the gear pump. During disassembly and inspection, keep all parts clean and stored properly.

LEADER pump maintenance

When using gear pumps, it is unavoidable to encounter wear on the gear pump. Therefore, many problems will arise. Thus, it is necessary to learn the most common maintenance techniques for gear pumps. This enables accurate diagnosis when issues occur. Routine maintenance procedures are as follows: 1) Maintenance of the working surface: If the wear on the pump cover's working surface is minor, you can manually eliminate the wear marks by lapping, specifically by placing a small amount of valve grinding compound on a surface plate or thick glass plate, then placing the pump cover on top for lapping, until the wear marks are removed, and the working surface is flat. If the wear depth on the working surface of the pump cover exceeds zero point one millimeter, it must be repaired by turning first, followed by lapping. 2) Maintenance of the drive shaft bushing bore: The repair method for wear on the drive shaft bushing bore in the pump cover is the same as that for the housing's drive shaft bushing bore. Repair of the pump housing bore: After wear occurs in the pump housing bore, the sleeve insertion method is used for repair, which involves boring out the inner cavity and fitting a cast iron or steel sleeve. After inserting the sleeve, bore the inner cavity to the required dimensions, and grind off the portion of the sleeve protruding from the end face, ensuring it is flush with the mating surface of the pump housing. 3) Maintenance of the valve seat: Pressure-limiting valves come in two types: ball valves and plunger valves. After the ball valve seat wears, place a steel ball on the valve seat, then gently tap the steel ball with a metal rod, until the ball valve seats tightly against the valve seat. If the valve seat is severely worn, ream to remove the wear marks, and then use the above method to achieve a tight seal. After the plunger-type valve seat wears, add a small amount of valve grinding compound for lapping, lap until a tight seal is achieved. The above describes some of the most basic maintenance procedures for components of gear pumps. During application, other different issues may also be encountered. These different issues must be carefully analyzed to identify their causes.

Weidou Intelligent Technology specializes in selling German LEADER gear pumps, LEADER gear pumps, LEADER diaphragm pumps, LEADER centrifugal pumps, LEADER piston pumps, LEADER vacuum pumps, LEADER screw pumps, LEADER submersible pumps, LEADER peristaltic pumps, LEADER lubrication pumps, LEADER vane pumps, LEADER metering pumps, LEADER hand pumps, LEADER barrel pumps, LEADER cam pumps, LEADER booster pumps, LEADER liquid pumps, and LEADER air pumps. All are original imports from Germany. Customers are welcome to inquire and order.