German Laweco pump Laweco model Laweco price

Laweco 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 specialized literature, 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.

Laweco pump working principle

Its operating principle is similar to that of a single-acting vane pump. The only difference is that the stator surface consists of eight parts: two long-radius arcs, two short-radius arcs, and four transition curves, and the stator and rotor are concentric. With the rotor rotating clockwise as shown, the volume of the sealed working chamber gradually increases at the upper left and lower right corners, forming the suction zone, and gradually decreases at the lower left and upper right corners, forming the pressure zone; a sealing zone separates the suction and pressure zones. For each revolution of the rotor, each sealed working chamber completes two suction and two pressure actions, hence it is called a double-acting vane pump. The two suction zones and two pressure zones of the pump are radially symmetric, and the hydraulic pressure acting on the rotor is radially balanced, so it is also called a balanced vane pump. The instantaneous flow rate of a double-acting vane pump is pulsating; when the number of vanes is a multiple of 4, the pulsation rate is small. Therefore, the number of vanes for double-acting vane pumps is generally chosen as 12 or 16.

Laweco pump usage precautions

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, its suction and discharge directions also change. Vane pumps have a specified rotation direction and reverse rotation is not allowed. Because the rotor vane slots are inclined, the vanes have chamfers, the bottom of the vanes communicates with the discharge chamber, and the throttle grooves on the 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 distribution plate and stator must be correctly positioned with locating pins. The vanes, rotor, and distribution plate must not be installed backwards. The suction area of the stator inner surface wears most easily; if necessary, it can be flipped for installation so that the original suction area becomes the discharge area for continued use. 3) Disassembly and assembly: Keep working surfaces clean, and ensure the oil is 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 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 should not exceed 55℃, and viscosity should be between 17～37mm2/s. If the viscosity is too high, oil suction is difficult; if the viscosity is 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.

Laweco pump common problems

1) Insufficient flow. Causes and remedies for insufficient flow in vane pumps. Loose screws at the top cover cause increased axial clearance and reduced volumetric efficiency. Tighten the screws appropriately to ensure uniform and proper clearance (clearance is 0.04～0.07 mm). If individual vanes slide inflexibly, clean them. If they remain inflexible after cleaning, adjust them individually in their slots. Wear on the stator inner surface prevents good contact between the vanes and the stator; wear usually occurs in the suction chamber. Severe wear on the end face of the distribution plate requires replacement. If the vanes and rotor are installed backwards, ensure the vane inclination direction matches 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 remedies for vane pumps failing to suck up oil. Low oil level prevents oil suction; check and fill to the specified oil level mark. Excessive oil viscosity causes vanes to slide inflexibly in the rotor slots; generally use 20# hydraulic oil or 22# turbine oil. Poor contact between the distribution plate end face and the housing plane causes communication between high and low-pressure chambers; repair the distribution plate end face. Sand holes inside the pump body cause communication between high and low-pressure chambers; replace the pump. Incorrect motor rotation direction; correct it. 3) Excessive pump noise. Clogged oil filter causes poor suction; clean it. Air leakage at the suction end; check suction pipe joints one by one by applying butter; if noise decreases, tighten the joints. 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 the pump and motor shafts; realign them to be concentric. The two sides of the rotor vane slots are not perpendicular to its two end faces; replace the rotor. Relief triangular groove on the distribution plate is 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 is too tight (causing overheating); adjust or replace appropriately. Pump speed is too high; operate at the specified speed. Insufficient oil suction volume; check oil level. Severe hydraulic oil contamination; 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.

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