Factors Affecting The Function Of The Vacuum Pump
Jun 25, 2019| 1. The effect of condensate:
The condensed water has a position of no importance in the multi-stage vacuum pump. In order to enclose the condensed water, the steam can be condensed sufficiently. The partial pressure of water vapor in the vacuum pump discharge pressure must be higher than the corresponding full steam pressure, so the temperature of the condensed water should also be Below the full temperature at this pressure, the normal operation of the pump body is completed. In addition, the condenser's condensing power is also very important. The condensation of the condenser is poor, which will cause the steam to enter the next stage pump because it is less than condensed. Increase the load of the after-stage pump and affect the pumping capacity of the pump. For this reason, the inlet temperature of the condensate, the flow rate and the operation of the condenser have a great influence on the function of the pump.
2. The effect of steam:
The vacuum pump used by us is a steam ejecting vacuum pump, which is based on super full water vapor. The condition of the steam has a decisive influence on the function of the pump. Wet steam not only affects the function of the pump, but also corrodes the steam nozzle and adds the amount of steam to the pump, which makes the pump's working condition unstable.
3. The impact of internal leakage:
During the entire molten steel disposal process, the vacuum of the system is continuously increased following the reduction of the venting amount of the molten steel. In the early stage of steel liquid disposal, the system has a low vacuum and a large gas discharge. The pumping of the fore pump is required to be large. Usually, multiple pumps are connected in parallel to increase the pumping capacity of the system. When the vacuum of the system is continuously increased, the venting amount of the system is also reduced. In order to reduce the steam consumption and save energy, it is necessary to close several of the front-stage parallel pumps. 3A, 3B, 4A, 4B in the pump layout diagram is called the foreline pump, or the pre-pump pump, and B1 and B2 are called booster pumps. When the full pump is put in, B1 and B2 are on, and the 3B and 4B pumps are closed. In the layout diagram, it can be seen that the system is connected with the 3B and 4B pumps through two check valves. If the two check valve switches are not in place, there may be leakage, which will affect the system's ability, especially the valve leakage. A short circuit is formed in the system, so that the upper pump cannot operate normally due to excessive back pressure, and presents a double vacuum appearance. Secondly, the nozzle of the vacuum pump is composed of two parts. The two parts are connected by flanges. Regarding the vacuum pump of the coupling flange in the pump body, if the connection is formed by the leakage of steam due to the seal, the function of the pump will also be given. Form an impact.