The liquid ring vacuum pump body is equipped with appropriate amount of water as working fluid. When the impeller rotates clockwise, the water is thrown around by the impeller. Because of the centrifugal force, the water forms a closed ring which is approximately equal in thickness depending on the shape of the pump chamber. The inner surface of the lower part of the water ring is just tangent to the hub of the impeller, and the upper inner surface of the water ring is just in contact with the top of the blade. At this time, a crescent-shaped space is formed between the hub and the water ring of the impeller, which is divided into several small cavities equal to the number of blades by the impeller. If the lower part of the impeller is 0 degree as the starting point, the volume of the small chamber increases from small to large when the impeller rotates 180 degrees, and is connected with the suction port on the end surface. At this time, the gas is absorbed, and at the end of the suction, the small chamber is isolated from the suction port; when the impeller continues to rotate, the small chamber becomes smaller and compresses the gas; when the small chamber is connected with the exhaust port, the gas is discharged out of the pump.
Equipment is often used in many industrial sectors such as petroleum and chemical industry. In many industrial processes, vacuum filtration, vacuum moisture regain and vacuum degassing can be carried out. The liquid ring vacuum pump relies on the change of the volume of the pump chamber to achieve suction, compression and exhaust, so it belongs to the variable volume vacuum pump. Because the gas compression in the liquid ring vacuum pump is isothermal, it can extract flammable and explosive gases. In addition, it can also extract dusty and water-bearing gases, so it is used more and more widely.
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