Dry vacuum pump common faults and solutions

Dry pumps need to operate at purely volumetric levels, and Roots pumps do not have internal compression compared to rotary vane pumps. It is able to compress the exhaust pressure. All components in contact with the media are oil-free compared to rotary vane vacuum pumps and all components suitable for Roots pumps are equally suitable for dry vacuum pumps. It is characterized by compact structure, high pump speed. The most common problems when using dry vacuum pump and how to avoid? And Xiaobian come together to understand it! Common problems and solutions of dry vacuum pump Dry pump common faults and solutions 1, operating under extreme pressure For the maximum differential pressure to run Roots pump, cooling them before, it is not recommended to be placed directly under the pressure to run. At extreme pressures, the minimum or zero gas throughput does not distribute any heat through the gas or the surface of the enclosure due to the pump's speed. Due to a sudden increase in temperature, the air gap between the rotor and the housing is too small and the pump will stop rotating. In severe cases, this can cause the vacuum pump to fail completely. 2, improper temperature fluctuations Roots pump plug is still very hot case, the sudden drop in ambient temperature will cause the pump casing shrink, causing the pump to stop rotating. As shown in Figure 1, this is especially important when working under extreme pressures. Therefore, a sudden change in ambient temperature must be avoided at all costs. In addition, the operator must be careful not to suddenly open the nearby shutters, other doors, etc., especially in the winter. In addition, for those freestanding pumps, place them under the eaves or canopy to prevent them from being exposed to rain. If you pump the water directly against the pump in the event of a fire, the pump casing may explode, especially those made of gray cast iron that explode more easily. Ductile iron version of the pump, due to its higher strength of the material, is more suitable to withstand such heat fluctuations. 3, temperature control If the Roots pump with its maximum differential pressure operation, you need to install a temperature sensor on the exhaust side to prevent overheating and any damage. This generates an alarm at a limited temperature, and when it reaches the maximum allowable temperature it will shut down the pump. 4, rapid time-out In the application, you must achieve a few seconds of the extraction cycle, so the operator must ensure that the Roots pump and fore pump ratio of 1: 2. This ratio is necessary because the foreline pumps pump out air for most of the pumping time at a pressure of 100 hPa and Roots pumps operate efficiently only from 10 hPa. Therefore, the foreline pump size must be correspondingly larger. 5, start the pump If you use a multi-stage pumping station or a plurality of vacuum pump combination of parallel operation, it is necessary to start the pumps at staggered intervals, the first to start the air pump, so as to avoid excessive power peaks and Protect high cost circuit breakers. This is easily achieved in the controller and in the PLC via the timekeeping element. Another method is to use a frequency converter to start the pump slowly. 6, liquid intrusion Sudden invasion of liquid can damage the pump, because the rapid cooling occurs, the gas can not reach the required temperature to evaporate the liquid. Additional steam can not be pumped in time as the foreline pump is overloaded and the foreline pressure may rise to excessive levels. To prevent this, it is necessary to install a receiver between the chamber and the Roots pump so that the liquid is absorbed before it enters the pump. 7, dust accumulation In the process of producing particles or entrained with dust, such as in the metallurgical or crystal pulling process, it is necessary to install a filter at the pump inlet to protect the Roots pump and the downstream pump. So-called debris protection screens should be installed at the air inlet of the Roots pump to prevent larger solids and beads from coming out of the welded joint due to improper cleaning when the system is first used. In this case, it is recommended to use the pump manufacturer's accessories because the debris protection net is designed so that its free cross section matches the nominal pump diameter. 8, rare and noble gas extraction When pumping expensive and pure gas, such as helium 3 or helium 4, these gases must be avoided at all costs in contact with the ambient air. In this case, the pump body is required to have a higher air tightness and a lower leakage rate in the region of less than 10 -5 to 10 -8 hPa l / s. Some vacuum pump manufacturers, like Pfeiffer Vacuum, are able to provide permanent magnet couplings instead of ordinary shaft feeders. This makes history of leaks present on all shaft seals. Closed-loop motors are also available, but operators must rely on the pump manufacturer for maintenance as these enclosed motors were developed specifically for this pump. For example using magnetic coupling technology, a cost-effective standard motor can be used. (Editor: Li Juan QQ:) Recommended reading: Acting purchasing the top ten brands of vacuum pumps

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