German BAIER+KOPPEL pump BAIER+KOPPEL model BAIER+KOPPEL price

BAIER+KOPPEL pumps are pumps in which the vanes in the rotor slots contact the pump casing (stator ring) to press the sucked liquid from the inlet side to the outlet side. There are two types depending on the type: One) Specifically refers to vane pumps among positive displacement pumps. Two) Refers to the three dynamic pumps (centrifugal pumps, mixed-flow pumps, axial-flow pumps) or other special pumps. Such pump products are generally not called vane pumps. However, in monographs, vane pumps almost entirely refer to centrifugal pumps, mixed-flow pumps, axial-flow pumps, etc. Depending on whether the theoretical displacement per revolution is a fixed value or a variable value, they can be divided into variable displacement vane pumps and fixed displacement vane pumps.

BAIER+KOPPEL pump working principle

The pump consists of components such as the rotor 1, stator 2, vanes 3, oil distribution plate, and end cover. The inner surface of the stator is a cylindrical bore. There is an eccentricity between the rotor and the stator. The vanes can slide flexibly within the rotor slots. Under the action of centrifugal force during rotor rotation and pressure oil supplied to the base of the vanes, the tops of the vanes press tightly against the inner surface of the stator. Thus, sealed working chambers are formed between adjacent vanes, the oil distribution plate, the stator, and the rotor. When the rotor rotates counterclockwise, the vanes on the right side of the diagram extend outward, gradually increasing the volume of the sealed working chamber and creating a vacuum. Oil is then sucked in through the suction port 6 and the window on the oil distribution plate 5. On the left side of the diagram, the vanes retract inward, gradually reducing the volume of the sealed chamber. The oil in the sealed chamber is pressed out through another window on the oil distribution plate and the pressure port 1, outputting it to the system. In this pump, suction and pressure discharge each occur once per rotor revolution, hence it is called a single-acting pump. The rotor is subjected to radial hydraulic unbalanced forces, so it is also known as an unbalanced pump, resulting in high bearing loads. Changing the eccentricity between the stator and the rotor changes the pump's displacement, so these pumps are all variable displacement pumps.

BAIER+KOPPEL pump usage precautions

Key management points for vane pumps, in addition to preventing dry running and overload, preventing air ingestion and excessive suction vacuum, include: 1) If the pump rotation direction changes, its suction and discharge directions also change. Vane pumps have a specified rotation direction and reverse operation is not allowed. Because the rotor vane slots are inclined, the vanes have chamfers, the bottom of the vanes connects to the discharge chamber, and the throttle grooves on the oil distribution 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 oil distribution plate and stator must be correctly positioned with locating pins. The vanes, rotor, and oil distribution plate must not be installed backwards. The suction zone part of the stator's inner surface wears most easily; if necessary, it can be flipped for installation so that the original suction zone becomes the discharge zone for 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 increases; if too small, the vanes cannot extend and retract freely, leading to malfunction. 5) The axial clearance of vane pumps has a significant impact on ηv. 1) Small pumps - 0.015～0.03mm2) Medium pumps - 0.02～0.045mm6. Oil temperature and viscosity: Generally should not exceed 55℃. Viscosity requirements are between 17 and 37mm2/s. If viscosity is too high, suction is difficult; if too low, leakage is severe. As pump products, vane pumps more often refer to sliding vane pumps. Vane pumps almost entirely refer to sliding vane pumps.

BAIER+KOPPEL pump common problems

1) Insufficient flow. Causes and troubleshooting for insufficient flow in vane pumps. Loose screws at the top cover increase axial clearance and reduce volumetric efficiency. Tighten screws appropriately to ensure uniform and proper clearance (clearance is 0.04～0.07 mm). If individual vanes do not slide flexibly, clean them. If they remain inflexible after cleaning, adjust individually by slot. Wear on the inner surface of the stator prevents good contact between the vanes and the stator inner surface. Stator inner surface wear generally occurs at the suction chamber. Severe wear on the face of the flow distribution plate requires replacement. Vanes and rotor installed backwards cause the vane inclination direction to match the rotor rotation direction. Large system leakage requires checking each component for leaks and checking if the pressure gauge is blocked by dirt. 2) Oil not being sucked up. Causes and troubleshooting for oil not being sucked up in vane pumps. Low oil level prevents oil suction; check and fill to the specified oil level mark. Excessive oil viscosity prevents flexible sliding of vanes in the rotor slots; generally use 20# hydraulic oil or 22# turbine oil. Poor contact between the face of the oil distribution plate and the housing plane causes communication between high and low pressure chambers; repair the face of the oil distribution plate. Sand holes inside the pump body cause communication between high and low pressure chambers; replace. Motor rotation direction is reversed; correct it. 3) Excessive pump noise. Clogged oil filter impedes suction; clean. Air leak at the suction end; apply butter to check suction pipe joints one by one. If noise decreases, tighten the joint. Directly observe if bubbles appear at the return oil port. Wear on the pump end seal; apply butter to the shaft end oil seal. If noise decreases, replace the oil seal. Pump cover screws loosen due to vibration; apply butter to the screw connections. If noise decreases, tighten the screws. Misalignment between pump and motor shafts; realign to make them concentric. The two sides of the rotor's vane slots are not perpendicular to its two end faces; replace the rotor. Unloading of the oil distribution plate; triangular groove is too short; modify appropriately with a file set so that when the previous vane passes the unloading groove, the next vane has already detached from the suction chamber. Seal at the spline shaft end is too tight (causing a hot-to-touch phenomenon); adjust or replace appropriately. Pump speed is too high; operate at the specified speed. Insufficient oil suction by the oil pump; check oil level. Severe contamination of hydraulic oil; remove the oil filter, check for damage or excessive solid adsorption, and replace the oil filter and hydraulic oil. Pressure fluctuation; check the wear condition of the main pressure valve core of the pump core.

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