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Noise caused by the stainless steel gear pump from the following situations (1) "cavitation" phenomenon and "suction" phenomenon and the phenomenon of "suction" phenomenon is caused by stainless steel gear pump noise is too high, one of the main reasons in the flow Of the liquid, because the pressure at some point below the air separation pressure bubble phenomenon, known as the "air pocket" phenomenon.After the separation of these air is bound to form a large number of bubbles so that the original continuous oil into a discontinuous state , At the same time these bubbles will be with the oil from the low pressure chamber of the gear pump into the high pressure chamber, the rapid rupture of the oil under the impact of pressure, the process is an instantaneous, will cause local hydraulic impact in the bubble condensation where pressure and The temperature will rise sharply, causing strong vibration and noise in the "cavitation" phenomenon, often accompanied by howling and system pressure fluctuations, resulting in the device may not work properly at this time, if the suction pipe joints and Shaft stretch oil seal at the seal is not good, into the oil pipeline blockage, the tank surface level is too low, the oil viscosity is too high, it will cause the gear pump suction port at the high vacuum, the air infiltration, resulting in "suction" phenomenon When these infiltrate the bubbles Into the stainless steel gear pump high pressure chamber will also have a "cavitation" phenomenon, causing vibration and noise.Currently taken measures are: â‘ According to the actual flow of the gear pump use larger diameter suction pipe, pipe layout as reasonable as possible Reduce the local resistance of the pipeline to ensure that the flow rate of the stainless steel gear pump suction pipe oil 2-3 m / s. Check the viscosity of the hydraulic oil is too high, then replace the hydraulic oil and clean the pipeline; â‘¡ Check the suction pipe joint seal is reliable, Shaft seal at the Department of wear, deformation, or replace the seal; â‘¢ using large-capacity suction filter, and try to install the lower part of the tank to ensure that the oil filter oil capacity, regular cleaning of the filter; â‘£ regular inspection of oil Liquid level, add hydraulic oil, the liquid level in the tank above the gear pump suction port.
(2) excessive wear and tear of parts noise Stainless steel gear pump during use, due to internal parts wear and tear, excessive clearance, damage to the seal, etc., will cause large gear pump leakage (high and low pressure chamber connected) caused by the pump Flow and pressure changes, resulting in vibration and noise.Solutions are: â‘ Check the gear pump sliding bearing and gear journal with the ask gap is normal, otherwise replace; â‘¡ Check the sleeve (or side) and the gear with the surface for damage , If found abnormal, according to the specific situation to take the grinding gear side, sleeve end face and shell end or replacement parts to ensure the best clearance 0.12-0.18mm, reducing stainless steel gear pump leakage and reduce noise.
(3) Tooth shape error Noise such as gear surface roughness, tooth error, tooth deformation and other reasons, will cause the gear meshing uneven, causing noise.Usually take the method is: â‘ for large displacement and bear high The load gear pump, in order to improve the tooth profile accuracy, usually uses the gear grinding process, which can not only correct the gear tooth distortion caused by heat treatment deformation, but also can improve the tooth surface roughness to meet the requirements of meshing accuracy and reduce noise; â‘¡ For medium and small displacement gear pump, if not using grinding process, without changing the tooth shape, by improving the accuracy of gear cutting tools and processing equipment, reduce tooth profile error, can reduce the gear pump noise; can also be guaranteed At the same time of tooth profile, the method of "low noise" can be obtained by changing the tooth shape of gear wheel.General measures for vibration of gear pump are to add accumulator and silencer at the outlet of gear pump to achieve Reduce the noise effect. Stainless steel gear pump speed is too high, there will be resonance.When the basic pump frequency and resonant frequency and mechanical or hydraulic natural frequency, the noise will greatly increase.If the oil election Improperly, the viscosity is too large, hydraulic pump oil resistance increases, resulting in noise pump section of the sudden expansion and contraction of the flow channel, sharp turn. Channel cross section is too small will lead to turbulence, vortex and jet flow, so that noise increases Others, such as bearing improper assembly, damage, pump shaft and ancillary equipment installation, such as coaxial over tolerance will also increase the noise should be promptly checked, if necessary, replaced.
Stainless steel gear pump leak reasons
Stainless steel gear pump leakage problems 1. Installation Static leakage test, which use the stainless steel gear pump for the main rotor, the outer rotor for the driven theory. Due to the difference between the number of teeth inside and outside the rotor, so there are two in the process of meshing Sub-mesh, will form several independent closed packet of liquid chamber.With the rotation of the internal and external rotor rotation, the volume of the liquid in each package changes: When the volume of the liquid chamber from small to large, Vacuum, under atmospheric pressure, the liquid passes through the annular groove on the inlet pipe and pump cover and enters the pump chamber to start aspirating liquid when the volume of the liquid chamber reaches the maximum. Absorption of the end of the process; when the volume within the liquid chamber from large to small. The liquid in the liquid chamber will be pressed out from the other annular groove to drain the pump, and when the internal gear pump works, the internal and external rotors will rotate in the same direction around the two axes parallel to each other for different speeds Relative movement. The movement of the rotor inside and outside the ever-changing space, as connected with the suction liquid drainage to achieve the purpose of absorbing liquid.