SK single-stage liquid ring vacuum pump

Water ring vacuum pump (referred to as water ring pump) is a type of coarse vacuum pump, which can achieve a maximum pressure of 4-8 kPa for single-stage pumps; For two-stage pumps, it is 2-4 kPa. Water ring pumps have been widely used in many industrial processes such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration, and vacuum moisture recovery in industries such as petroleum, chemical, machinery, mining, light industry, papermaking, power, metallurgy, medicine, and food, as well as in municipal and agricultural sectors. Due to the isothermal compression process of gas, water ring pumps can extract flammable and explosive gases, as well as dust and water containing gases. Therefore, the application of water ring pumps is increasing day by day.

The schematic diagram of the working principle of a water ring pump is composed of an impeller, a pump body, a suction and exhaust disc, a water ring formed by water on the inner wall of the pump body, a suction port, an exhaust port, an auxiliary exhaust valve, etc.

The impeller is eccentrically installed in the pump body. When the impeller rotates in the direction shown in the diagram, the water entering the water ring pump body is thrown around by the impeller. Due to the centrifugal force, the water forms a closed water ring of equal thickness similar to the shape of the pump chamber. The upper inner surface of the water ring is exactly tangent to the impeller hub, and the lower inner surface of the water ring is just in contact with the top of the blade (in fact, the blade has a certain insertion depth inside the water ring). At this point, a crescent shaped space is formed between the impeller hub and the water ring, and this space is further divided into several small chambers equal to the number of blades by the impeller. If starting from the upper 0 ° of the impeller, the volume of the small chamber gradually increases and the pressure continuously decreases before the impeller rotates 180 °. It is connected to the suction port on the suction and exhaust disc. When the pressure in the small chamber space is lower than the pressure in the container being pumped, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small chamber, and at this time, it is in the process of suction. When the inhalation is completed and isolated from the inhalation port, the volume of the small chamber is gradually decreasing, and the pressure is constantly increasing. At this time, it is in the compression process. When the compressed gas reaches the exhaust pressure ahead of schedule, it is discharged from the auxiliary exhaust valve ahead of schedule. The volume of the small chamber connected to the exhaust port is further reduced, and the pressure is further increased. When the gas pressure is greater than the exhaust pressure, the compressed gas is discharged from the exhaust port. During the continuous operation of the pump, the suction, compression, and exhaust processes are continuously carried out to achieve the purpose of continuous pumping.
In a water ring pump, the auxiliary exhaust valve is a special structure that generally uses a rubber ball valve. Its function is to eliminate the phenomenon of over compression and under compression generated during the operation of the pump. Both of these phenomena can cause excessive power consumption. Because the water ring pump does not have a direct exhaust valve and the exhaust pressure is always fixed, the compression ratio of the water ring pump is determined by the end position of the intake port and the start position of the exhaust port. However, these two positions are fixed and cannot adapt to the needs of changes in suction pressure. To solve this problem, a rubber ball valve is usually installed below the exhaust port, so that when the pump chamber reaches the exhaust pressure too early, the ball valve will automatically open and the gas will be discharged, eliminating the phenomenon of over compression. Generally, when designing a water ring pump, the compression ratio is determined based on the lowest suction pressure to determine the starting position of the exhaust port, thus solving the problem of insufficient compression.

Scope of use
Mainly used to extract air and other gases that are corrosive, insoluble in water, and allow for the presence of small amounts of dust. Widely used in processes such as vacuum evaporation, concentration, feeding, dehydration, and drying in industries such as food, textile, pharmaceutical, and chemical. This series of pumps has the characteristics of compact structure, reliable use, easy assembly and disassembly, and simple maintenance.