Fixed vacuum pump features
Fixed-plate vacuum pumps are used not only as pre-stage pumps for diffusion pumps or condensate pumps, but also for vacuum depressurization, dry distillation and the like. Fixed vacuum pumps feature simple structure, long service life, and easy maintenance.
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Under normal circumstances, a vacuum pump of a general structure is not suitable for pumping a gas containing a large amount of water vapor, because the vapor will condense during the compression process, and because the pressure reached in the compression chamber gradually increases to the saturated vapor pressure (the operation of the pump At a temperature of about 60°C and a saturated vapor pressure of 150 mmHg), the vapor starts to condense. At this time, the exhaust valve has not been opened, so the vapor is not discharged. At this time, the vapor condenses into water in the pump and mixes with the oil. Stay in the pump together. After the water is mixed into the oil, it forms an emulsion. The oil contains acid, which causes gelation of the oil and oxidation of the metal parts of the pump, thereby damaging the mechanical pump. Sometimes the condensed water circulates with the oil in the aspirator. When it reaches the inlet end, it will cause re-evaporation and it will enter the pumped container, which will destroy the vacuum of the pumped container. Fixed-type mechanical pumps are characterized by simple structure, long service life, and easy maintenance. However, when the volume is large (ie, the pumping rate is required to be large), it is rarely used because the slide plate is difficult to ensure the seal.
With the development of the market, the fixed-plate vacuum pump itself is constantly improving. Because of its long service life, simple overhaul, convenient operation, etc., its share in the entire market is still very considerable because of its shortcomings. For professionals, there is room for development and improvement. The level of industrial production in our country is constantly improving, and how the fixed-plate mechanical pump embodies its value here, pending more research and innovation.