Gear pump in the vacuum oil purifier, as an exhaust pump will have been purified in the vacuum tank separation of oil from the vacuum tank out of the oil to overcome the vacuum suction. The noise generated by gear pump is the main noise source of vacuum oil filter. Analysis of gear pump noise causes and control of noise, will help improve the quality of vacuum oil purifier. About gear pump noise troubleshooting methods What? Gear pump noise causes Gear pump noise generated in the following four aspects: (1) trapped oil phenomenon caused by pressure shock or cavitation, resulting in noise; (2) due to gear manufacturing error, when it is engaged operation , The gear teeth may be subjected to sudden load shock caused by vibration and make noise; (3) flow pulsation caused by pressure pulsation and noise; (4) bearing accuracy or poor installation caused by noise and side plates and gear side Friction and stimulate the noise and so on. One of the most important is (1), (2) two reasons, especially the phenomenon of oil trapped the greatest impact on the noise. In order to ensure smooth operation of the gear meshing, the overlap coefficient must be greater than 1, then in a period of time there are two pairs of gear meshing, so that between the two pairs of gears formed between the oil can not be neither oil nor oil The sleepy oil volume. For sleepy oil volume changes. When the trapped oil volume changes from small to small (the amount of change is Ah), the internal pressure rises up to cause shock and vibration. When the trapped oil volume changes from small to large (the change is AF2), the internal pressure decreases to form a vacuum , Causing cavitation. This is the so-called trapped oil phenomenon. In order to solve the noise excited by the trapped oil phenomenon, an effective measure is to process the unloading trough on the side plate. The principle is that when the volume of the trapped oil changes from large to small, the unloading trough communicates with the tightening pressure chamber to discharge oil Liquid; when the trapped oil volume from small to large, with the relief groove so that it communicates with the suction chamber, thereby absorbing oil broken, which can prevent the trapped oil phenomenon. If the unloader slot is opened accurately, you can reduce the noise about 7dB (A). Gear pump noise failure analysis and countermeasures For a formed gear pump, its unloading groove has been machined, its gear accuracy, bearing accuracy and installation accuracy have been determined. Gear pumps sometimes still generate large noise, especially as gear pumps used as drain pumps in vacuum filters. Because of the need to overcome the suction force of the vacuum when discharging the oil in the vacuum tank, this makes it more difficult for the gear pump to discharge the oil, and if the handling is not proper, it is likely to generate large noise. In the vacuum oil pump gear pump produce a lot of noise, you can look for the reasons from the following aspects and take countermeasures: (1) gear pump in front of the suction pipe or filter blockage. At this point you can see from the tubing little fluid inhalation, lack of oil will cause dry grinding and cavitation, make a big noise, at the moment should find the clogging point, remove dirt, so that oil absorption. (2) gear pump suction pipe before the inhalation of air. At this point, bubbles can be seen from the suction pipe, and air bubbles are also seen from the discharged oil. Cavitation noise is generated when the gear pump sucks in the air. Prior to the row of various parts of the pump before the valve, the pump into the flange oil seal, self-tight pump oil seal, after the search should be quickly ruled out. (3) into the oil filter flow area is too small. If you exclude the first modern tool in the high-speed steel cutting tool substrate. With physical vapor deposition (PVD), coated with a thin layer of wear-resistant materials, can greatly improve the performance of high-speed steel cutting tools, in general. Coating materials used TiN, TiC and so on. However, the use of TiN. After coating, the tool surface was golden yellow. Coated thick-coated high-speed steel cutters appeared around 1980 in the international market. The development is extremely rapid, it has been in the high-speed steel tool for more than 10 years and end mills, drill bits and other coatings, improve the cutting efficiency. Obtained significant economic benefits. Our research on coating Yu steel tool from the 80's. In the past ten years, the tool manufacturing industry has moved from the United States. Japan introduced nearly 10 sets of PVD coating equipment, has sold a variety of coated high-speed steel cutting tools. In all regions and departments, there are a large number of domestically manufactured coating facilities that use different methods of physical vapor deposition, such as arc plasma vapor deposition, electron gun ion beam plasma deposition, hollow cathode gun electron beam emission Ion plating, e-beam gun launch electron beam ion plating, etc., each with its own characteristics and advantages and disadvantages, the quality of coating products are also different. Arc generation plasma vapor deposition method used most. The advantages of coated HSS thermal conductivity of 29.31W / (mC), linear expansion coefficient (9.319.39) xl (T6 / C. And the hardness of high-speed steel substrate is only HV800850. Therefore, the coating of high-speed steel Tool, the surface of the hard layer, good wear resistance, and the friction coefficient between the processed material is small; the toughness of the matrix material does not reduce the practical situation shows that, compared with uncoated HSS, coated HSS Cutter cutting force can be reduced by 5 to 10% .Because the Xu layer material has a thermal barrier effect, the cutting part of the cutting tool cutting degree has also been reduced; workpiece surface roughness has been reduced; tool should be considered into the oil filter The choice is appropriate problems, such as the oil filter flow through the area is too small, the same will make less suction oil, causing dry grinding and cavitation, make a loud noise. The solution is to replace the filter through a considerable area. (4) The pump speed is too high. Each gear pump has the recommended maximum operating speed, if you want to increase the flow rate by increasing the speed, it will make gear tooth meshing vibration acceleration, pump suction will appear insufficient, resulting in the pump The noise increased sharply , Should be promptly reduced speed, (5) pump shaft and motor shaft is not the heart gear pump requires the use of shaft sleeve or elastic shaft drive mode, such as two axes are not the same, will make the vibration in the drive increased gear pump by alternating load Force, the noise will be very large, should be reassembled to maintain concentricity. Summary: This article only on the gear pump in the vacuum oil purifier used in the production of the sound made some simple analysis, while in other areas the use of tantalum wheel Pump noise. Also can be roughly from the above five reasons to find and exclude. Asia Fluid Network () Editor: Huang Nengwen, QQ:

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