German lecomble & schmitt pumps lecomble & schmitt models lecomble & schmitt prices

lecomble & schmitt 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 referring to vane pumps among positive displacement pumps. Two) referring to the three pumps 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, as a monograph, vane pumps almost all refer to centrifugal pumps, mixed-flow pumps, axial-flow pumps, etc. According to whether the theoretical displacement per revolution is a fixed value or a variable value, it can be divided into variable displacement vane pumps and fixed displacement vane pumps.

lecomble & schmitt pump working principle

The pump consists of components such as the rotor 1, stator 2, vanes 3, valve 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 two adjacent vanes, the valve 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 oil suction port 6 and the window on the valve plate 5. On the left side of the diagram, the vanes retract inward, gradually decreasing the volume of the sealed chamber. The oil in the sealed chamber is pressed out through another window on the valve plate and the pressure oil port 1, outputting it to the system. In this pump, oil 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 higher bearing loads. Changing the eccentricity between the stator and the rotor changes the pump's displacement, so these pumps are all variable displacement pumps.

lecomble & schmitt pump common problems

1) Insufficient flow. Causes and remedies for insufficient flow in vane pumps. Loose screws at the top cover increase axial clearance, reducing 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, match them individually to the slots. Wear on the inner surface of the stator prevents good contact between the vanes and the stator inner surface; wear on the stator inner surface usually occurs at the suction chamber. Severe wear on the valve plate face requires replacement. Vanes and rotor installed incorrectly; ensure the vane inclination direction matches the rotor rotation direction. Large system leakage; check each component for leaks and check if the pressure gauge is clogged with dirt. 2) Oil not being sucked up. Causes and remedies for vane pump oil suction failure. Oil level too low; check and fill to the specified oil level mark. Oil viscosity too high, causing vanes to slide inflexibly in rotor slots; generally use 20# hydraulic oil or 22# turbine oil. Poor contact between the valve plate face and the housing inner plane causes communication between high and low-pressure chambers; rework the valve plate face. Sand holes inside the pump body cause communication between high and low-pressure chambers; replace. Motor rotation direction reversed; correct it. 3) Excessive pump noise. Clogged oil filter causes poor suction; clean. Air leakage at the suction end; apply butter to check suction pipe joints one by one; if noise decreases, tighten the joints. Directly observe if bubbles appear at the return oil port. Pump end seal wear; apply butter at the shaft end oil seal; if noise decreases, replace the oil seal. Pump cover screws loosened due to vibration; apply butter to screw connections; if noise decreases, tighten the screws. Pump and motor shafts misaligned; realign them. Rotor vane slot sides not perpendicular to its end faces; replace the rotor. Valve plate relief triangular groove too short; modify appropriately with a file so that when the previous vane passes the relief groove, the next vane has already detached from the suction chamber. Seal at the spline shaft end too tight (causing heating); adjust or replace appropriately. Pump speed too high; operate at the specified speed. Insufficient oil suction by the oil pump; check oil level. Hydraulic oil severely contaminated; 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.

lecomble & schmitt pump usage precautions

Key management points for vane pumps, in addition to preventing dry running, overload, air suction, 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 must not be reversed. Because the rotor vane slots are inclined, the vanes have chamfers, the vane bottoms connect to 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. Use locating pins to correctly position the valve plate and stator. Vanes, rotor, and valve plate must not be installed backwards. The suction zone part of the stator inner surface wears most easily; if necessary, it can be flipped for installation to make the original suction zone the discharge zone for continued use. 3) Disassembly and assembly. Keep working surfaces clean; ensure oil is well filtered during operation. 4) Excessive clearance between vanes and vane slots increases leakage; too little clearance prevents free vane extension/retraction, causing malfunction. 5) Axial clearance of vane pumps greatly affects 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 17～37mm2/s. Too high viscosity makes oil suction difficult; too low viscosity causes severe leakage. As pump products, vane pumps more often refer to sliding vane pumps. Vane pumps almost entirely refer to sliding vane pumps.

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