(1) parts wear overproduction noise
Stainless steel pump in use process, due to internal parts wear strain, clearance is too large, sealing ring damage etc, can create pump of the internal leakage (high, low pressure chamber communicate) cause pump flow and pressure mutation, produce vibration and noise. Solution: (1) check the gear pump sliding bearing and gear shaft neck cooperation ask gap is normal or not, or to change; (2) the inspection shaft sleeve (or side plate) and gear with surface any damage, if discovery is unusual, according to the specific circumstances take grinding gear profile, bush face and shell face or replacement parts. To ensure best clearance 0.12-0.18 mm stainless steel pump, reduce the internal leakage, reduce noise.
(2) gas hole "phenomenon and" suction empty "phenomenon
气穴"现象和"吸空"现象是造成不锈钢齿轮泵噪声过高的主要原因之一.在流动的液体中,因某点处的压力低于空气分离压产生气泡的现象,称为"气穴"现象.这些空气分离出来后势必形成大量的气泡致使原来连续的油液变成不连续的状态,同时这些气泡会随着油液由齿轮泵的低压腔进入高压腔,在压力油的冲击下迅速破裂,这一过程是瞬间发生的,会引起局部液压冲击.在气泡凝结的地方,压力和温度会急剧升高,引起强烈的振动和噪声.在"气穴"现象产生时,常伴有啸叫并引起系统压力的波动,致使设备有时不能正常工作.此时,若吸油管接头处和轴伸油封处密封不好,进油管道堵塞,油箱内液面位置过低,油液粘度过高,则会造成齿轮油泵吸油口处真空度过高,使空气渗入,产生"吸空"现象,当这些渗入的气泡进入不锈钢齿轮泵的高压腔时也会产生"气穴"现象,引起振动和噪声.目前通常采取的措施是:①根据齿轮泵的实际流量选用直径较大的吸油管,管路布置尽量合理以减少管路局部阻力,确保不锈钢齿轮泵吸油管油的流速2—3 m／s.检查液压油的粘度,过高则更换液压油并定期清洗管路;②检查吸油管接头处密封是否可靠,轴伸处油封是否磨损,变形,否则更换密封件;③采用大容量的吸油过滤器,并尽量安装在油箱下部,以保证滤油器的通油能力,定期清洗滤油器;④定期检查油液面,添加液压油,使油箱内液面位置高于齿轮泵的吸油口。
(3) profile error produce noise
Such as gear surface roughness is poor, profile error is big, tooth deformation and other reasons, can create gear meshing uneven, cause noise. Usually take the method is: (1) for large displacement and endure high load of gear pump, in order to improve the precision of the gear tooth profile, usually by grinding process, can be modified gear heat treatment deformation caused by the profile error, and can improve the gear tooth surface roughness, meet the accuracy requirement of the mesh, reduce noise; (2) for small and medium-sized displacement gear oil pump, if do not use grinding process, not changing the profile of the premise, through the improve gear cutting tools and the precision of the processing equipment, reduce the tooth profile error, can reduce the noise of gear pump, Also can guarantee the accuracy of the tooth profile, at the same time, by changing the tooth profile method, obtain "low noise" good results. Pump vibration general of the measures taken in the pump the oil outlet in the accumulator and silencer in order to reduce the effect of noise. Stainless steel pump speed is too high, can produce resonance. When the pump basic frequency and resonant frequency and mechanical or hydraulic natural frequency consistent. Noise will greatly increase. If the oil viscosity is too large, improper selection of hydraulic pump oil absorption resistance increased, produce noise. Pump inside passage section suddenly expansion and contraction, quick turn. Channel section is too small will cause oil appears turbulent, whirlpool and jet, make noise increase. Other such as bearing assembly is undeserved, damage. Pump shaft and equipment installation coaxial degree such as super also can make noise increase. Should be timely check, change when necessary.
In fact the stability of the pump, but also we choose to pump a major requirements, we all know, pump life consumption cost, the price is in the possession of only a small part of the daily maintenance, so the stability is also very important, can prolong life to reduce cost. Some of the above, the paper is stainless steel pump noise occurred several reasons, and the solution.
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