The principle of the water ring vacuum pump

I don’t know much about water ring vacuum pumps; I only know that they use a liquid seal formed around the impeller to draw in gas from the inlet. I would appreciate it if someone with more knowledge could explain to me how exactly they work.

Simply put, it is the process of suction, compression, and exhaust that is achieved through changes in the volume of the pump chamber, driven by the centrifugal force of the eccentric wheel.

http://bbs.hcbbs.com/thread-225287-1-1.html Take a look at the introduction on floor 2.

A water ring vacuum pump operates by means of an eccentric rotor with multiple blades mounted within the pump casing; this rotor rotates to throw water against the casing, thereby forming a water ring that is concentric with the casing. The interaction between this water ring and the rotor blades creates periodic changes in volume, which allows gas to be drawn in, compressed, and then discharged. Its advantage is a large pumping capacity at low vacuum levels, and it can directly pump condensable gases such as water vapor. Its drawback is the low vacuum level ； It is not possible to suction media containing particles ； It is difficult to apply anti-corrosion treatment to rotors that rotate at high speeds; therefore, they cannot be used to pump corrosive media.

Reply to 1# Crying Devil: I’ll organize it a bit and see if it works 1. What is the working principle of a water ring vacuum pump? In a water-ring vacuum pump, the impeller is mounted eccentrically within the pump body. Before starting, a certain amount of water is poured into the pump. As the impeller rotates, the water is subjected to centrifugal force, resulting in the formation of a rotating water ring against the walls of the pump body. The blades and the distributors at both ends create a sealed cavity. During the first half of a rotation cycle (when passing through the suction port), the volume of this sealed cavity gradually increases, allowing gas to be drawn in through the suction port ； During the rotation in the latter half of the turn (at this point passing through the exhaust port), the volume of the sealing cavity gradually decreases, and gas is expelled through the exhaust port. To maintain a constant water ring, water must be continuously supplied to the pump during operation. 2. What are the characteristics of water ring vacuum pumps? The water ring vacuum pump belongs to the category of wet vacuum pumps; it allows liquid to be included in the intake air, has a simple and compact structure, and can achieve a maximum vacuum level of 85%. The water ring vacuum pump can also be used as a blower, with an outlet pressure not exceeding 1 atm (gauge pressure). 3. What is the purpose of filling water into a water ring vacuum pump? Filling a water ring vacuum pump with water is mainly done to maintain the liquid seal inside the pump while it is in operation, and it also serves a cooling purpose.