Oil diffusion pump Description:
KT oil diffusion pump is mainly used to obtain 10-2~10pa high vacuum and ultra-high vacuum state of the main equipment KT oil diffusion pump and valve cooling well pipeline mechanical vacuum pump and other vacuum components together to form a high vacuum pumping system.
Oil diffusion pump product features:
Diffusion pump oil heated to boiling temperature in the vacuum of the (about 200 degrees) to produce a large amount of oil steam and oil vapor by the nozzle by various directional high-speed nozzle due to the diffusion pump inlet near than steam partial pressure is pumped gas flow, partial pressure of the gas is pumped gas molecules high speed movement in the direction of the steam, gas molecular pump back reflection wall, again by collisions among the steam flow along the wall of steam flow direction flow pump again.After several collisions, the gas molecules are compressed to the low vacuum end, and then the steam ejected from the nozzle of the next several stages is compressed at multiple levels. Finally, the oil vapor is pumped away by the front stage pump, and the oil vapor is condensed on the cooling pump wall and then returned to the lower layer to be heated again, so as to achieve the purpose of air extraction.
Oil diffusion pump product advantages:
Generally, the performance of diffusion pump is determined by the maximum reverse pressure extraction rate of extreme vacuum and the setting of cold well or low temperature baffle
1. Limit vacuum: if the general structure of oil diffusion pump is improved, such as reducing the backflow of oil vapor, additional distillation device, reasonable distribution of heating power, improvement of nozzle Angle design, and oil baffle baffle or cold well adsorption well, the performance of diffusion pump can be greatly improved, and the limit vacuum can reach lower pressure
2.Maximum negative pressure: the maximum negative pressure refers to the maximum preposition pressure allowed by the diffusion pump. If the pressure generated by the front stage pump is higher than the maximum negative pressure, the diffusion pump will not work properly
3. Pumping rate: the pumping rate of the diffusion pump can be calculated according to the theory of gas molecular motion
4. Set the cold trap and the reasons for the low temperature damper: due to the diffusion pump oil spray nozzle of vapor molecules, most of the condensate pump wall, this is because the outside wall of pump set cooling jacket or because of the cooling pipe wall reflection, but there are a few of vapor molecules are pump scattering returns is pumped space, this kind of phenomenon in the low-temperature laboratory should pay special attention to such as before the diffusion pump and is pumped container with cold trap or low temperature, so you can make the back to add steam is condensed down, as the oil vapor regurgitation the influence factors of oil diffusion pump is as follows
1.Oil diffusion pump backflow
2.Antidiffusion of gas molecules
3. Cracking and decomposition of diffusion pump oil. Generally, the working oil required by diffusion pump is within saturated vapor pressure (about 0.00000001Pa at room temperature)
4 pump cleaning is not clean, pollutants in the pump and repeated circulation, affecting its vacuum