Stainless steel gear pump leakage Static test when the installation leaks, which use the stainless steel gear pump for the main rotor, the outer rotor is the driven theory. As the number of teeth inside and outside the rotor, so there is a second meshing meshing process , Will form several independent closed package liquid chamber.With the internal and external rotor meshing rotation, the volume of each package liquid chamber changes in different ways: When the volume of the liquid chamber from small to large, the local vacuum generated in the liquid chamber, Under atmospheric pressure, the liquid passes through the annular groove in the inlet pipe and the 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 of the other annular groove to drain the pump, and the internal gear pump will work in the same process when both internal and external rotors rotate in the same direction with different speeds on two axes parallel to each other 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. 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 infiltration bubbles enter Rust 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 selection of 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, so that the liquid level in the tank above the gear pump suction port. (2) Excessive wear parts stainless steel gear pump during use, due to internal parts wear and tear, the gap is too large, Damage, etc., will cause gear pump large internal leakage (high and low pressure chamber connected) caused the pump flow and pressure mutations, resulting in vibration and noise.Solutions are: â‘ Check the gear pump sliding bearing and gear journal with Is normal, or replace; â‘¡ Check the shaft sleeve (or side plate) and the gear with the surface for damage, if found to be abnormal, depending on the circumstances to take grinding gear side, sleeve end face and shell end or replacement parts to ensure The best gap of 0.12-0.18mm, reduce the stainless steel gear pump leakage and reduce noise (3) tooth shape error such as gear surface roughness, tooth error, tooth distortion and other reasons, will result Gear meshing uneven, causing noise.Usually take the method is: â‘ For large displacement and high load gear pump, in order to improve the tooth profile accuracy, usually using grinding process, both can be modified gear heat treatment caused by deformation Tooth-shaped error, but also can improve the roughness of the tooth surface to meet the requirements of meshing accuracy and reduce noise; â‘¡ For medium and small displacement gear pump, if you do not use grinding process, without changing the tooth profile, by improving the gear tool And the accuracy of the processing equipment, reduce the tooth profile error, can reduce the gear pump noise; also can ensure the accuracy of the tooth profile, by changing the gear tooth profile method, to obtain the "low noise" good effect. Wheel pump vibration is generally taken measures 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 pump frequency and its When the resonance frequency and the mechanical or 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 flow passage section suddenly expanded and contracted, sharp turn. Channel section is too small, etc. will lead to oil turbulence, vortex and jet, so that noise increases.Other, such as bearing improper assembly, damage.Pump shaft and ancillary equipment installation, such as coaxial over tolerance and so will increase the noise Should be promptly checked, if necessary, replaced.
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