German Berarma Srl pump Berarma Srl model Berarma Srl price

Berarma Srl pumps are pumps in which the vanes in the rotor slots contact the pump casing (stator ring) to press the sucked liquid from the oil inlet side to the oil 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, in monographs, vane pumps almost entirely 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, they can be divided into vane variable displacement pumps and vane constant displacement pumps.

Berarma Srl 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 oil suction zone, and gradually decreases at the lower left and upper right corners, forming the oil pressure zone; there is an oil sealing zone between the suction zone and the pressure zone to separate them. For each revolution of the rotor of this pump, each sealed working chamber completes the oil suction and oil pressure actions twice, so it is called a double-acting vane pump. The two oil suction zones and the two oil pressure zones of the pump are radially symmetrical, 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, and the pulsation rate is small when the number of vanes is a multiple of 4. For this reason, the number of vanes for double-acting vane pumps is generally taken as 12 or 16.

Berarma Srl pump precautions for use

In addition to preventing dry running and overload, preventing air suction and excessive suction vacuum, the management points for vane pumps also 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 is connected to the discharge chamber, and the throttle grooves on the distribution plate and the suction/discharge ports are designed for the specified 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 zone part of the inner surface of the stator is most prone to wear. 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: Pay attention to the cleanliness of the working surfaces, and the oil should be well filtered during operation. 4) If the clearance between the vane and the vane slot is too large, leakage will increase; if it is too small, the vane cannot extend and retract freely, leading to abnormal operation. 5) The axial clearance of the vane pump has a great influence 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 a pump product, vane pumps mostly refer to vane pumps. Vane pumps almost entirely refer to vane pumps.

Berarma Srl pump common problems

1) Insufficient flow. Causes and troubleshooting methods for insufficient flow in vane pumps. Loose screws at the top cover, increased axial clearance, decreased volumetric efficiency. Tighten the screws appropriately to ensure uniform and appropriate clearance (clearance is 0.04 ~ 0.07 mm). Individual vanes slide inflexibly; clean them. If they remain inflexible after cleaning, adjust individual 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 generally occurs at the suction chamber. Severe wear on the end face of the distribution plate requires replacement. Vanes and rotor installed backwards; align the vane inclination direction with the rotor rotation direction. Large system leakage; check each component for leakage and check if the pressure gauge is blocked by dirt. 2) Oil cannot be sucked up. Causes and troubleshooting methods for oil suction failure in vane pumps. Oil level too low, oil cannot be sucked up; check and fill to the specified oil level mark. Oil viscosity too high, causing vanes to slide inflexibly in the rotor slots; generally use 20# hydraulic oil or 22# turbine oil. Poor contact between the end face of the distribution plate and the housing plane causes communication between high and low-pressure chambers; repair the end face of the distribution plate. 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, poor oil suction; clean. 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 if bubbles appear at the oil return port. Wear on the pump end seal; apply butter to the shaft end oil seal. If the noise decreases, replace the oil seal. Pump cover screws loosened due to vibration; apply butter to the screw connections. If the noise decreases, tighten the screws. Pump and motor shafts not concentric; realign to make them concentric. Both sides of the rotor vane slots are not perpendicular to their end faces; replace the rotor. Distribution plate unloading, triangular groove too short; modify appropriately with a file so that when the previous vane passes the unloading groove, the next vane has detached from the suction chamber. Seal at the spline shaft end too tight (hot to touch); adjust or replace appropriately. Pump speed too high; use at the specified speed. Insufficient oil suction volume; 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 pump core total pressure valve spool.

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