With the pump in the vacuum unit pumping speed _

general high vacuum systems shall be by vacuum to obtain a high enough vacuum unit. The simplest vacuum unit in multi-stage diffusion water pump or turbo molecular pump ( As the main pump) With the mechanical water pump ( As a booster pump) And other series. When used in multiple pump series, not only limit vacuum must have certain requirements, also should have a reasonable cooperate between pumping speed, in order to give full play to the efficiency of the pump. The relationship between the pump and can be based on the steady flow, the flow rate constant to determine the relationship.

give priority to the pumping speed of the pump set S1, S2 for booster pump, pumping speed, p1 for the import of primary pump pressure at work, P2 for booster pump inlet pressure. The main pump pumping capacity of p1S1, booster pump pumping quantity for P2S2. Steady flow, the two are equal, reason has: p1S1 = p2S2

to:

the booster pump pumping speed should be equal to the main pump pumping speed multiplied by two pump working pressure ratio (p1 / p2. Because of p1, p2, the S2, S1, the booster water pump pumping speed ratio of main pump pumping speed is small. For example, a work crew of diffusion pump pressure for 10 - mechanical pump Three times, namely p1 / p2 = 10 - 3, theoretically mechanical pump pumping speed is only one over one thousand of the diffusion pump pumping speed. Actual use mechanical pump pumping speed should be 3 ~ 5 times larger than the theoretical value, with sufficient leeway; At the same time can be shorten the time of the system to achieve required to start the pressure diffusion pump.

now many of the company, because of the need to meet the production needs to buy a vacuum unit. But it is important to note that in the process of buying must listen to the professional advice, choose the appropriate own vacuum unit.

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