Traction molecular drag pump service providers molecular pump repair Which Pana photoelectric

1. turbo molecular pump works here called "trap" metaphor is a structure such that the gas molecules along a certain direction easily by, and difficult to pass in the opposite direction. Look at the life of an example, Figure 1 is catch eel baskets, this structure makes it easy eel from the inlet into the bottom feeding, and extremely difficult to escape from the opposite direction, this is a trap. Look at Figure 2, which is an imaginary mountain pass, since this structure is designed, obviously, the degree of difficulty by people from two directions is not the same, if the average person appears in any position at the entrance, then left right, right to left easily than through, the ratio is about 5: 1, which is a trap. For the model in Figure 2, you can introduce a physical - transmission probability, it can be understood, to equality of opportunity (equal probability) appears in the possibility (probability) entry to any person through the Pass of the location. Obviously respect to Figure 2, the probability of transmission is from left to right 1, i.e. can pass, and the transmission probability of about 1/5 from right to left, i.e., an average of 5 people 1 people through. Thus, if the starting time, the number of passes on both sides are equal, then it gradually increased slowly to the right. Transmission probability is the movement of molecules in the gas is a very important concept, such as gas molecules through an oblong pipe, its ease of transport available to characterize the probability of the pipeline. When the pipe length to diameter ratio (l / r) is constant, the transmission probability is determined, and the transmission probability is usually also the same in both directions. Discussed above can be known, Ye turbo molecular pump must be tilted in the direction of movement of gas molecules formed at both sides before transmission probability by differences in leaf columns, resulting suction effect. As Ye movement velocity magnitude in respect of both sides of the transmission probability of group size, due to the speed and average speed thermal motion of molecules together determine the size of the transmission probability, it must reach an average speed of molecular thermal motion of the order. The above results are based on illustrations, and basic life experience to intuitively understand obtained. In effect, this conclusion can be strictly in accordance with the basic theory of kinetic theory is given, in order to better understand the principles exhaust turbo molecular pump, as discussed further below. First we must understand when gas molecules collide with the wall surface reflection followed the law. When gas molecules collide with the general surface reflection, specular reflection comply with the rigid laws of the ball on the rigid surface is completely different. Its reflection direction is a random event with a probability characteristics that it may either direction in the space 2π solid angle has reflected, and the likelihood (ie probability size) to comply with the so-called Knudsen cosine law. 11, AB is the incident direction, BC for a possible reflection direction,? D may be a small solid angle for the direction of the reflected near the element, i.e. comprising a small spaced. Dongguan molecular drag pump maintenance , Pana optoelectronics, molecular drag pump service providers by the Campana photoelectric - provide molecular pump supply maintenance. Huizhou traction molecular pump maintenance, Pana optical, magnetic levitation turbo molecular pump repair facility in Guangzhou Pana Optoelectronics Technology Co., Ltd. (shop1367601917907.1688.com/)2014年全新升级推出的