A brief introduction to vacuum systems and an explanation of their components.

The vacuum system is actually a similar term for the vacuum unit, which is a set of closed-loop vacuum equipment composed of several types.Vacuum pumpIt does not necessarily have equipment such as heat exchangers, condensers, etc. Generally, what can be called avacuum systemmust have various complete components.Vacuum applicationsThere are many types of equipment, but regardless of the type of vacuum application equipment, there is a set of exhaust systems to remove gases from the container being evacuated, in order to achieve the required vacuum conditions inside the vacuum container. For example: a container for vacuum processing is connected to a vacuum pump via pipes and valves. When the vacuum pump evacuates the container, there must be avacuum measurementdevice on the container, which constitutes the simplest vacuum pumping system. So how many pumps are composed in a vacuum system compared to a unit? This is uncertain, so let's first understand the possible definitions of the pumps.

　　Main pump: In a vacuum system, it is a vacuum pump used to achieve the requiredvacuum degreeto meet specific process requirements, such as the oil diffusion pump in a vacuum coating machine, which is the main pump.

　　Forepump: A vacuum pump used to maintain the pressure before a certain vacuum pump below its critical forepressure. For example,the Roots pumpis configured witha rotary vane pumpor a sliding valve pump as the forepump.

　　Rough pump: A vacuum pump that starts pumping from atmospheric pressure and reduces the system pressure to the point where another vacuum pump can start working. For example, the sliding valve pump in a vacuum coating machine is a rough oil pump.

　　Maintaining pump: Whenvacuum systemthe gas volume is very small, the forepump cannot be effectively utilized. Therefore, a smaller auxiliary pump is configured to maintain the operation of the main pump, which is called a maintaining pump. For example, a small rotary vane pump at the outlet of a diffusion pump is a maintaining pump.

　　In fact, a simple vacuum system can only achieve a rough vacuum, and to obtain a high vacuum, a high vacuum pump is usually connected in series in the vacuum system, such as the Roots pump andscrew pumpare all pumps for achieving high vacuum. After connecting a high vacuum pump in series, it is usually necessary to add valves at the inlet and outlet of the high vacuum pump so that the high vacuum pump can maintain vacuum independently. The vacuum technology network (http:www.wxlizhi.com) believes that if the high vacuum pump connected in series is an oil diffusion pump, in order to prevent a large amount of oil vapor from flowing back into the evacuated container, a collector—a water-cooled baffle—is usually added at the inlet of theoil diffusion pump.According to requirements, dust collectors, vacuum relay heads, vacuum flexible connection pipes, vacuum pump vent valves, heat exchangers, etc. can also be added to the pipeline, thus forming a more complete high vacuum system.