Stainless steel gear pump noise causes

Noise is the stainless steel gear pump often encountered a failure, then the stainless steel gear pump noise caused by the reason? With this question, the following is about stainless steel gear pump noise introduction. Stainless steel gear pump noise (1) "cavitation" phenomenon and "suction" phenomena "cavitation" and "suction" phenomenon is caused by stainless steel gear pump noise is one of the main reasons in the flow of liquid , Because the pressure at a 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, while these Bubbles will enter the high pressure chamber as the fluid moves from the low pressure chamber of the gear pump to the high pressure chamber and rupture rapidly under the pressure of the oil, a process that occurs instantaneously, causing localized hydraulic impacts where the pressure and temperature are sharp Rise, causing strong vibration and noise in the "cavitation" phenomenon, often accompanied by howling and cause system pressure fluctuations, resulting in the device sometimes does not work properly at this time, if the suction pipe joints and the shaft stretch seal Department of seal is not good, into the oil pipeline blockage, the tank surface level is too low, the viscosity of the oil is too high, it will cause the gear pump suction port at the high vacuum, the air infiltration, resulting in "suction" phenomenon, when these Infiltration of bubbles into stainless steel teeth Pump high pressure chamber will also produce "cavitation" phenomenon, causing vibration and noise.Currently taken measures are: ① According to the actual flow of the gear pump use larger diameter suction pipe, pipe layout as reasonable as possible to reduce the pipeline Local resistance, to ensure that the stainless steel gear pump suction pipe oil flow rate 2-3 m / s. Check the viscosity of hydraulic oil, the replacement of hydraulic oil is too high and regularly clean the pipe; ② Check the suction pipe joints at the seal is reliable, shaft extension The oil seal is worn, deformed, or replace the seal; ③ 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; ④ regular inspection of the oil surface, Add hydraulic oil to make the liquid level in the oil tank higher than that of the gear pump oil inlet. (2) Excessive wear caused by parts wear When the stainless steel gear pump is worn, the clearance is too large and the seal ring is damaged, Will cause the large internal gear pump leakage (high and low pressure chamber connected) caused a sudden change in the flow and pressure of the pump, resulting in vibration and noise.Solutions are: ①Check the gear pump sliding bearing and gear journal with the ask gap is normal, Otherwise, replace; ② Check the shaft sleeve (or side plate) and the gear with the surface for damage, if abnormal, according to the specific situation to take grinding gear side, sleeve end face and shell end or replacement parts to ensure the best clearance 0.12-0.18mm, reduce internal leakage of stainless steel gear pump, reduce noise. (3) Tooth shape error such as gear surface roughness, tooth error, tooth deformation and other reasons, will cause uneven gear meshing, causing Noise is usually taken: ① For large displacement and high load gear pump, in order to improve the tooth profile accuracy, usually using gear grinding process, can not only correct gear tooth distortion caused by heat treatment deformation, but also can Improve the roughness of the tooth surface to meet the requirements of the meshing accuracy and reduce noise; ② 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 the tooth profile error, can reduce the noise of the gear pump; Also can ensure the accuracy of the profile, by changing the gear tooth profile, get "good" low noise. Take the measure is to install the gear pump outlet at the accumulator and muffler in order to achieve the effect of reducing noise.Stainless steel gear pump speed is too high will produce resonance.When the basic frequency of the pump and its resonant frequency and mechanical Or the hydraulic natural frequency is consistent, the noise will greatly increase.If the oil is improperly selected, the viscosity is too large, the hydraulic pump oil resistance increases, resulting in noise.Pump section of the flow channel suddenly expanded and contracted, sharp turn.Channel cross section is too small Etc. will lead to oil turbulence, vortex and jet, so that noise increases.Other bearings such as improper assembly, damage and other equipment when the shaft assembly and coaxial over tolerance will increase the noise should be promptly checked , If necessary, replace. The above is the reason why the stainless steel gear pump produces noise. I hope everyone can help in the actual use of stainless steel gear pump after everyone read these contents. Read more: China Building Water Exhibition Pump Valve Tube Fittings Exhibition Water Expo Xiamen Maritime Exhibition Internet + Forum Yiwu Expo Industry Interconnection (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Duanhui (QQ / WeChat:) http://beng.liuti.cn/ (service hotline:)

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