A liquid ring pump is a type of vacuum pump that operates using a rotating positive displacement pump. These vacuum pumps are most often used to remove excess liquid during a manufacturing process. The pumps can also be used as a gas pump in some circumstances. These vacuum pumps have a huge range of use in many industrial processes from paper manufacturing to food production.
Liquid ring pumps work by rotating a vaned impeller located inside a cylindrical case. When a liquid enters the pump, the rotating impeller creates a compressive force due to the rotation of the liquid. The compression from the water seals the vanes in the impeller, creating a vacuum. The combination of trapped gas and liquids forces liquid through the pump and out the other side.
The earliest form of liquid ring pumps were created in the early 1900s by the Siemens-Schukert company. These pumps used the same technology that liquid ring pumps use today, just on a less efficient scale. The pumps were highly efficient and had few moving parts, which made them a popular vacuum pump choice for liquids. Even today, liquid ring pumps are widely used in liquid vacuuming applications in many industrial settings.
Today’s modern liquid ring vacuum pumps have two different modes. One kind of pump uses one single compression chamber and is known as a single stage pump. The other kind, which is much more common in today’s manufacturing, is the multi-stage pump. This pump has two or more compression chambers, which increases the effectiveness of the pump. Some of the most common uses for the pumps include the manufacturing of paper, the molding of paper crates and other molded paper products, the removal of contaminated ground water, and in vapor recovery systems.