German B & C pumps, B & C models, B & C prices

B & C 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: One) specifically refers to vane pumps among positive displacement pumps. Two) refers to the three types of 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.

B & C pump operating principle

The pump consists of components such as the rotor 1, stator 2, vanes 3, oil distribution plate, and end covers. 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 vane roots, the vane tips 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 oil port 1, delivering 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.

B & C pump usage precautions

Key management points for vane pumps, in addition to preventing dry running, overload, air ingestion, and excessive suction vacuum, include: 1) If the pump rotation direction changes, the 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 vane bottoms communicate with 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 using locating pins. The vanes, rotor, and oil distribution plate must not be installed backwards. The suction zone portion 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, allowing continued use. 3) Disassembly and assembly: Keep working surfaces clean. The oil should be well filtered during operation. 4) Excessive clearance between the vanes and the vane slots increases leakage; too little clearance prevents the vanes from extending and retracting 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-sized pumps - 0.02 ~ 0.045mm6. Oil temperature and viscosity: Generally, the temperature should not exceed 55 °C, and the viscosity should be between 17 and 37mm2/s. If the viscosity is too high, oil 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.

B & C pump common issues

1) Insufficient flow. Causes and remedies 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 ~ 0.07 mm). If individual vanes do not slide flexibly, clean them. If they remain inflexible after cleaning, adjust them slot 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 usually occurs at the suction chamber. Severe wear on the face of the distribution plate requires replacement. If the vanes and rotor are installed backwards, align the vane inclination direction with the rotor's rotation direction. Large system leaks require checking each component for leaks and checking if the pressure gauge is clogged with debris. 2) Oil not being sucked up. Causes and remedies for vane pumps failing to suck up oil. If the oil level is too low, check and fill to the specified oil level mark. If the oil viscosity is too high, causing inflexible 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 the pump. If the motor rotation direction is reversed, correct it. 3) Excessive pump noise. Clogged oil filters cause poor suction; clean them. Air leakage at the suction end can be checked by applying butter to each suction pipe joint; if noise decreases, tighten the joint. Directly observe if bubbles appear at the oil return 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 the pump and motor shafts: Realign to make them concentric. If 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: If the triangular groove is too short, modify it appropriately with a file so that when the previous vane passes the unloading 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 appropriately. If the pump speed is too high, operate at the specified speed. If the oil pump 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. Pressure oscillation: Check the wear condition of the main pressure valve core.

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