I have a really stupid question: How is vacuum created while driving?
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I suddenly thought of a practical, probably rather stupid question. At steady state, the vacuum pump creates a vacuum environment. . . If driving the vehicle, with such a long process sequence, it’s theoretically unlikely for the vacuum pump to suddenly turn the entire system from a stationary state into a vacuum environment, right? How is this actually done? This post was last edited by jin9090900 on 2009-3-21 23:20]
Of course, the vacuum pump is started first to create a vacuum; only after the vacuum level reaches the required standard is material feeding begun. If the vacuum level cannot meet the requirements at the time of startup, how is it possible to begin operations on a formal basis? So as long as the power load requirements for the vacuum pump are met, there will be no problem!
Generally, for large-scale equipment or those with complex processes that require vacuuming, vacuum pump systems are used; pumping starts with the primary pump, and once the desired level of vacuum is achieved, the secondary and tertiary pumps are activated. The vacuum pump system with an appropriate pumping capacity is selected based on the production requirements and conditions. :victory:
Yes, it belongs to the preparations before driving
Whether it is steam evacuation or mechanical evacuation, it is not possible to achieve the required vacuum level in a short time during the startup process. If steam evacuators and vacuum pumps are used, steam can be employed first to create a vacuum in stages, first at one level and then at another, until the desired vacuum level is reached; thereafter, the vacuum pump can be started. Once the vacuum pump is operating, the steam evacuation can be stopped according to the required vacuum level； If only mechanical vacuum pumping is used, and the process permits vacuum creation, the vacuum pump is started, and the opening degree of the inlet valve is controlled to prevent the pump from being overloaded. The inlet valve is gradually opened depending on the load on the vacuum pump, so that the vacuum level can be increased step by step to meet the requirements of production
Before starting the vehicle, make sure to have the vacuum ready first; only start the vehicle after the system meets the required conditions. At the beginning of applying vacuum, the load on the vacuum pump is high; the valve used to create vacuum should be opened very slightly, with the load capacity of the vacuum pump being adjusted accordingly.
Agree with what was said above; it’s necessary to evacuate the vacuum first before adding materials when driving the machine
I’ve learned it, but actually I’ve been confused all along
This should be part of the preparations before driving; according to the required vacuum level, it’s necessary to establish that vacuum level before adding materials!
As a supplementary point, after evacuating the system before starting operation, materials are not added immediately; generally, a pressure retention test is also carried out. That is, after reaching the specified vacuum level before starting up, the vacuum pump is turned off or the gas valve is closed, and the system is sealed and isolated for 15 to 30 minutes to observe the trend of the vacuum level rising. Then, the system’s leakage rate can be calculated based on the total volume of the system. If the leakage is severe, it is still not possible to drive immediately. It is necessary to find leaks in the system’s vacuum, and this is also the most troublesome task. Finding leaks under vacuum is much more difficult than under positive pressure.
Generally, there are several stages of pumps used for vacuum pumping. For example, in molecular distillation equipment, due to the different pressures required and the limitations of the pumps’ vacuum-pumping capacity, several pumps are needed to carry out the vacuuming task.