The limit of water ring vacuum pump around 2 kpa pressure? - - - - - -

dry screw vacuum water pump manufacturers introduced the basic principle of the water ring vacuum pumps and compared with some of the basic dry screw vacuum pump. In the introduction, we would talk about the limit of water ring vacuum pump pressure is about 2000. What causes the limit of water ring vacuum pump pressure?

in the original article, dry screw vacuum pump manufacturers also mentioned the limit of water ring vacuum pump pressure is limited by the working fluid, the most common is - — Water. It is restricted by working fluid is the cause of their saturated vapor pressure.

we know that the liquid will evaporate, that is to say, the molecules on the surface of the liquid will continue to escape from the liquid, into liquid in outer space. The higher the temperature, the lower the pressure, the more evaporation. The vapor pressure of liquid is produced liquid surface evaporation gas pressure. In closed condition and particular temperature, when the liquid evaporation and condensation in dynamic equilibrium, the vapor pressure of liquid is a saturated vapor pressure. At the same time, the inverse process of liquid evaporation condensation.

when the surface of the liquid pressure is less than the saturated vapor pressure and liquid in unsaturated state, the evaporation capacity is greater than the amount of condensation, the liquid to evaporate; When the surface of the liquid pressure is greater than the saturated vapor pressure and liquid steam hypersaturated state and compressed, this time a large number of condensation, which is much bigger than evaporation.

by the phase diagram of water, we can see it in the state of different pressure and temperature changes.

under the physical properties, due to low pressure is lower than the saturated vapor pressure of liquid, the liquid pressure in the vacuum will produce a large amount of evaporation, and so is a gas source in a vacuum. However, water ring vacuum pump in the process of work need water as the working medium. Saturated vapor pressure of water about 2338 mpa at 20 ℃, about 4245 mpa in 30 ℃. In other words, when the water ring vacuum pump at 20 ℃, once its working pressure water pump is to close to 2338 mpa, working liquid will begin a large amount of evaporation, forming gas source. However, water ring vacuum pump can't work without a working fluid, constantly add new working fluid in the process of evaporation, thus forming balance, to prevent the pressure further increase. This is why the pumping efficiency of water ring vacuum pump after the working fluid temperature will greatly reduce: the higher the temperature, the higher the saturation vapor pressure, working pressure, the higher the limit ( The lower the degree of vacuum) 。

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