Liquid ring vacuum pump for Vacuum Suction . Vacuum suction has the outstanding advantage of isothermal compression, which makes it particularly suitable for sucking or pressing inflammable, explosive and other gases, and because of the use of water seal, when sucking and pressing toxic and harmful gases, it can avoid and reduce hazards. I believe that the vast majority of users know that the substances sucked by vacuum can be solids, liquids or gases. Vacuum suction of dry fresh sand, used sand, dry soil powder, coal powder and some powder (such as zinc oxide powder) is a typical example of vacuum suction. Next, the vacuum suction of solids, liquids and gases will be briefly described.
Vacuum suction and barotropic conveying both use differential pressure to promote material conveying. Vacuum suction is to use liquid ring vacuum pump or blower to make the system in a vacuum state and form a pressure difference with the external atmospheric pressure, so that the material moves in the pipeline in suspension state, and finally separates the material and air flow through separator.
Vacuum suction can make use of either liquid ring vacuum pump to make vacuum state or blower to make vacuum state for transmission. In general, the vacuum pump is used when the vacuum degree reaches 30-50 kPa in the process of vacuum suction, but only 80-90 kPa vacuum degree is needed in the process of suction, which can be realized by blower. In other words, the use of liquid ring vacuum pump belongs to high vacuum suction, while the use of blowers for vacuum suction is low vacuum suction. One thing we need to know is that the higher the vacuum is, the thinner the air is. Correspondingly, the material carrying capacity in the transportation process will also be weakened.
Some problems needing attention in the application of liquid ring vacuum pump in vacuum suction are as follows:
1. Vacuum suction of solids
The materials to be absorbed generally include sand, salt, iron chips, refractory mud, clay powder, etc. Therefore, it is very important to choose the air velocity of the liquid ring vacuum pump reasonably. Too small, less than the settling speed of the material, the material can not be attracted and transported, or the blockage will occur if the transporting is not smooth; too small, not only consumes more power, but also speeds up the wear and tear of the equipment such as the transporting pipe.
2. Vacuum suction of liquids
This is divided into two ways: direct suction and brief suction.
Direct suction: The liquid ring vacuum pump directly sucks the liquid, and then arranges it to the desired place. This is the problem of pumping liquid directly. We should consider whether the pumped liquid is corrosive to the vacuum pump, whether it is toxic, flammable, explosive and so on. Otherwise, relevant measures should be taken.
Indirect suction: that is, pumping a certain intermediate container gas to form a certain degree of vacuum, and then sucking the liquid into the container. In order to prevent the liquid being pumped into the vacuum pump by mistake, one or more buffer tanks should be installed between the container and the pump. The liquid is dense and separated from the tank.
3. Vacuum suction gas
This is the most basic application of liquid ring vacuum pump. The difference is that the purpose is not to form a vacuum in a container, but to suck the gas in through the formed vacuum and then transport it out.