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柱塞泵或马达的噪声

       (1)吸空现象是造成液压泵噪声过高的主要原因之一。当油液中混入空气后,易在其高压区形成气穴现象,并以压力波的形式传播,造成油液振荡,导致系统产生气蚀噪声。其主要原因有:
  ①液压泵的滤油器、进油管堵塞或油液粘度过高,均可造成泵进油口处真空度过高,使空气渗入。
  ②液压泵、先导泵轴端油封损坏,或进油管密封不良,造成空气进入o
  ②油箱油位过低,使液压泵进油管直接吸空。
  当液压泵工作中出现较高噪声时,应首先对上述部位进行检查,发现问题及时处理。
  (2)液压泵内部元件过度磨损,如柱塞泵的缸体与配流盘、柱塞与柱塞孔等配合件的磨损、拉伤,使液压泵内泄漏严重,当液压泵输出高压、小流量油液时将产生流量脉动,引发较高噪声。此时可适当加大先导系统变量机构的偏角,以改善内泄漏对泵输出流量的影响。液压泵的伺服阀阀芯、控制流量的活塞也会因局部磨损、拉伤,使活塞在移动过程中脉动,造成液压泵输出流量和压力的波动,从而在泵出口处产生较大振动和噪声。此时可对磨损、拉伤严重的元件进行刷镀研配或更换处理。
  (3)液压泵配流盘也是易引发噪声的重要元件之一。配流盘在使用中因表面磨损或油泥沉积在卸荷槽开启处,都会使卸荷槽变短而改变卸荷位置,产生困油现象,继而引发较高噪声。在正常修配过程中,经平磨修复的配流盘也会出现卸荷槽变短的后果,此时如不及时将其适当修长,也将产生较大噪声。在装配过程中,配流盘的大卸荷槽一定要装在泵的高压腔,并且其尖角方向与缸体的旋向须相对,否则也将给系统带来较大噪声。

(1) air suction pump noise is caused by one of the main reasons is too high. When mixed with oil in the air, easy in its high-pressure area formed cavitation, and pressure wave form of communication, caused by oil shocks, resulting in cavitation noise generated. The main reason are:
① The oil filter pump, to plug into the pipeline or oil viscosity too high, can be caused by the oil pump into the mouth through the high vacuum Department so that the air infiltration.
② hydraulic pump, oil seal pilot pump shaft end damage, or sealed into the tubing poor air access to o
② tank oil level is too low, so that direct suction pump air into the pipeline.
When the hydraulic pump noise higher work should first check the above site and found a timely manner to deal with the problem.
(2) Hydraulic Pump excessive wear of internal components, such as the cylinder piston pump set with the assignment, such as the plunger with the plunger hole with pieces of the wear and tear, strain, so that a serious leak in the hydraulic pump, when the hydraulic pump output high-pressure, small volume flow of oil will have a pulse when triggered higher noise. At this point the pilot system can be appropriate to increase the angle variables agencies to improve the internal leakage of the pump output flow. Spool of the servo valve hydraulic pump to control the flow of the piston will be partially a result of wear and tear, strain, so that the process in the mobile piston pulse, causing the hydraulic pump output flow and pressure fluctuations, thus resulting in a larger outlet pump vibration and noise. At this time of wear and tear, injury serious brush components or replacement of inquiry to deal with.
(3) hydraulic pump with flow set is also easy to trigger a noise, one of the important components. Assignment in the use of disk wear and tear or due to the surface of sludge deposited on the unloading chute opened, the tank will cause the shorter unloading unloading position change, resulting in the phenomenon of trapped oil, sparking a high noise. In the normal repair process, by grinding flat disk to repair the assignment will also be shorter unloading slot of the consequences, if not timely at this time due to its slender, will also have a greater noise. In the assembly process, the assignment of the major unloading site must be installed in the trough of high pressure pump chamber, and pointed the direction of its rotation with the cylinder block relative to the need to, otherwise the system will also bring more noise.


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