German Busch pump Busch model Busch price

Busch pumps are rotary pumps that rely 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. Two closed 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 the gear pump depends entirely on the magnitude of the resistance at the pump outlet.

Busch pump working principle

The concept of a gear pump is very simple. Its most basic form consists of two gears of the same 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. Gear pumps are also called positive displacement devices. Like 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. The discharged volume is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid continuously. 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, the pump body cannot 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 type of pump is not significantly affected by changes in the viscosity or density of the process fluid. 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 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, 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.

Busch pump drive unit

In addition to preventing dry running, overload, air ingestion, and excessive suction vacuum, the key management points for vane pumps include: 1) If the pump rotation direction changes, the suction and discharge directions also change. Vane pumps have a specified rotation direction and reverse rotation is not allowed. Because the rotor vanes slots are inclined, the vanes have chamfers, the bottom of the vanes communicates with the discharge chamber, and the throttle grooves on the valve plate and the suction/discharge ports are designed for a specific rotation direction. Reversible vane pumps must be specially designed. 2) Vane pump assembly: The valve plate and stator must be correctly positioned using locating pins. The vanes, rotor, and valve plate must not be installed backwards. The suction area of the stator's inner surface is most prone to wear. If necessary, it can be flipped for installation so that the original suction area becomes the discharge area, allowing continued use. 3) Disassembly and assembly: Keep working surfaces clean. The oil should be well filtered during operation. 4) If the clearance between the vanes and the vane slots is too large, leakage will increase. If it is too small, the vanes cannot extend and retract freely, leading to malfunction. 5) The axial clearance of the vane pump has a significant impact on ηv. 1) Small pumps - 0.015 to 0.03mm2) Medium-sized pumps - 0.02 to 0.045mm6. Oil temperature and viscosity: Generally, the temperature should not exceed 55℃, and the viscosity should be between 17 and 37mm2/s. If the viscosity is too high, oil suction will be difficult; if the viscosity is too low, leakage will be severe. As pump products, vane pumps mostly refer to sliding vane pumps. Vane pumps almost exclusively refer to sliding vane pumps.

Busch pump common problems

1) Insufficient flow. Causes and troubleshooting methods for insufficient flow in vane pumps. Loose screws at the top cover increase axial clearance and reduce volumetric efficiency. Tighten the screws appropriately to ensure uniform and proper clearance (clearance is 0.04 to 0.07 mm). If individual vanes slide inflexibly, clean them. If they remain inflexible after cleaning, adjust them individually. If the inner surface of the stator is worn, the vanes cannot make good contact with the stator's inner surface. Stator inner surface wear generally occurs at the suction chamber. If the end face of the valve plate is severely worn, replace it. If the vanes and rotor are installed backwards, ensure the vane inclination direction matches the rotor's rotation direction. If there is significant system leakage, check each component for leaks and inspect whether the pressure gauge is clogged with dirt. 2) Oil cannot be sucked up. Causes and troubleshooting methods for vane pumps failing to suck up oil. If the oil level is too low, check and refill to the specified oil level mark. If the oil viscosity is too high, the vanes will not slide flexibly within the rotor slots. Generally, use 20# hydraulic oil or 22# turbine oil. If the end face of the valve plate has poor contact with the inner plane of the housing, causing communication between high and low-pressure chambers, repair the valve plate end face. If there are sand holes inside the pump body causing communication between high and low-pressure chambers, replace the pump. If the motor rotation direction is reversed, correct it. 3) Excessive pump noise. If the oil filter is clogged, causing poor oil suction, clean it. If there is air leakage at the suction end, apply butter to check the suction pipe joints one by one. If the noise decreases, tighten the joints. Directly observe whether bubbles appear at the oil return port. If the pump end seal is worn, apply butter to the shaft end oil seal. If the noise decreases, replace the oil seal. If the pump cover screws are loose due to vibration, apply butter to the screw connections. If the noise decreases, tighten the screws. If the pump and motor shafts are misaligned, realign them. If the two sides of the rotor's vane slots are not perpendicular to its two end faces, replace the rotor. If the valve plate relief triangular groove is too short, modify it appropriately with a file so that when the previous vane passes the relief groove, the next vane has already detached from the suction chamber. If the seal at the spline shaft end is too tight (causing a hot-to-touch phenomenon), adjust or replace it appropriately. If the pump speed is too high, operate at the specified speed. If the oil pump's suction volume is insufficient, check the oil level. If the hydraulic oil is severely contaminated, remove the oil filter, check for damage or excessive solid adsorption, and replace the oil filter and hydraulic oil. For pressure oscillation, check the wear condition of the main pressure valve core.

Weidou Intelligent Technology specializes in selling German Busch vacuum pumps, Busch gear pumps, Busch diaphragm pumps, Busch centrifugal pumps, Busch plunger pumps, Busch vacuum pumps, Busch screw pumps, Busch submersible pumps, Busch peristaltic pumps, Busch lubrication pumps, Busch vane pumps, Busch metering pumps, Busch hand pumps, Busch barrel pumps, Busch lobe pumps, Busch booster pumps, Busch liquid pumps, Busch air pumps. Original imports from Germany. Welcome inquiries and orders from users.