Reciprocating vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, roots vacuum pump is the reciprocating movement of the piston or rotation of the gas inhalation, compression and discharge. However, the piston is a working part, so the wear of the piston is unavoidable, with the increase of the number of maintenance work vacuum will continue to decline, until it can not meet the production requirements. This kind of pump work noise, oil consumption, high failure rate is also its fatal shortcomings, generally need to set up a spare machine, which virtually increases the equipment investment and operating costs. In addition, if the use of this type of pump suction water vapor and other condensable gas, will emulsify the lubricating oil, so can only be applied in the suction of non-condensable (air class) gas, can not suction with granular medium, which also limits its scope of application.
Water ring vacuum pump is installed in the pump shell with multi-blade eccentric rotor rotation, throwing water to the pump shell and pump shell concentric water ring, the water ring and rotor blade formed a volume cycle change in order to suction, compression and exhaust gas. Its disadvantage is low vacuum; Do not pump granular media; High speed rotor rotation is not easy to do corrosion treatment, so do not pump corrosive media.
Then what should be paid attention to when using these vacuum pumps? The vacuum required for each process must be checked first. Because each process has its own vacuum range, it must be carefully studied and determined.
Check the ultimate vacuum of the vacuum pump system based on the determination of the vacuum required by the process, because the ultimate vacuum of the system determines the optimal operating vacuum of the system. Generally speaking, the ultimate vacuum of the system is 20% lower than the operating vacuum of the system and 50% lower than the ultimate vacuum of the front stage pump.
Check and determine the type and volume of pumping required by the process. Because if the type of gas pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, the proper exhaust time and the amount of gas produced during the extraction must be considered.
Check to determine the time required to achieve the required vacuum, flow resistance and leakage of the vacuum pipe. Consider the extraction rate required to maintain vacuum under certain process requirements after the required vacuum degree is achieved.
Vacuum pump selection calculation
Where: s is the vacuum pump pumping rate (l/s) v is the vacuum chamber volume (l) t is the time required to achieve the required vacuum degree (s) p1 is the initial vacuum degree (torr) p2 is the required vacuum degree (torr)
This is where you need to pay attention to maintenance when choosing or using vacuum pumps
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