O-ring repair box manufacturers elaborate vacuum sealed

Vacuum sealing performance coupled depending on the leak and vacuum outgassing material at the coupling. Any vacuum system always want to leak, outgas small as possible, but due to leakage, gassing and seal type, sealing materials, precision machining and assembly quality and other factors relating to, so there is some leakage in the joints of the Association, put gas, it can be based on the nature of the work of the vacuum system, the level and size of the outlet of the pumping speed of the vacuum chamber work stress requests.

Exceeding the vacuum system is dynamic equilibrium gas state. Pressure limit within the system, on the one hand and the effective pumping speed of the pump light, on the other hand with the air flow from the interior of the vacuum envelope and its related components. Although the system is due to the effective pumping speed due to the pump size and cost structure and other reasons, there is always a practical limit. Therefore, to reduce the air flow to achieve ultra-high vacuum state became the basic design goals, the material of choice for ultra-high vacuum main criteria.

As materials used inside the vacuum system, the requirements of the saturated vapor pressure, and body in order to reduce chronic desorption outlet, requires capability 450 ℃ high temperature baking, without reducing the mechanical strength and chemical and physical damage does not occur. A vacuum system housing materials, gas permeability required to ignore, to withstand atmospheric pressure, corrosion resistant air during baking and leak does not occur. In addition, requirements for the selection of materials, manufacture easy, cheap and easy to get.

For vacuum below the ultra-high vacuum 10-7Pa, although natural and synthetic rubber seals are ideal materials, good elasticity, assembled vacuum sealing flange bolt force is small, and can be reused many times. However, due to the ultra-high vacuum systems require ring material resistant to 250 ℃ baking, in fact several are available rubber materials can not meet the requirements. Higher vacuum (ie lower pressure) ultra-high vacuum, it must use a metal seal.