German halder pump halder model halder price

halder 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 vane variable displacement pumps and vane fixed displacement pumps.

halder pump working principle

The pump consists of components such as the rotor 1, stator 2, vanes 3, valve 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 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 suction port 6 and the window on the valve 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 valve plate and the pressure port 1 to the system. In this type of pump, suction and discharge 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 displacement, so these pumps are all variable displacement pumps.

halder pump usage precautions

In addition to preventing dry running, overload, air ingestion, and excessive suction vacuum, key management points for vane pumps 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 bottom of the vanes connects 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: The valve plate and stator must be correctly positioned using locating pins. The vanes, rotor, and valve 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 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-sized pumps - 0.02～0.045mm6. Oil temperature and viscosity: Generally should not exceed 55℃, and viscosity should be 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.

halder pump common problems

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 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 slot by slot to ensure proper fit. Wear on the stator inner surface prevents good contact between vanes and the stator; wear usually occurs at the suction chamber. Severe wear on the valve plate face requires replacement. If vanes and rotor are installed backwards, align the vane inclination direction with the rotor rotation direction. Large system leakage requires 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. Low oil level prevents suction; check and fill to the specified oil level mark. Excessive oil viscosity causes 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 plane causes communication between high and low pressure chambers; repair the valve plate 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 impedes suction; clean it. Air leakage at the suction end; check suction pipe joints one by one by applying butter; if noise decreases, tighten the joint. Directly observe if bubbles appear at the return oil port. Worn pump end seal; apply butter at the shaft oil seal; if noise decreases, replace the oil seal. Pump cover screws loosen due to vibration; apply butter at screw connections; if noise decreases, tighten the screws. Misalignment between pump and motor shafts; realign to make them concentric. Non-perpendicularity between the two sides of the rotor vane slots and their 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. Overly tight seal at the spline shaft end (causing heating); adjust or replace appropriately. Pump speed too high; operate at the specified speed. Insufficient oil suction; check oil level. Severely contaminated 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.

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