Questions about the principle and operating process of water ring pumps
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I’m just starting to learn about *vacuum pumps, so my questions might be quite basic; please forgive me. 1. How does a water ring pump create a stable water ring? The explanations I found in the materials all state that due to centrifugal force, the liquid injected into the pump forms a rotating liquid ring. I can understand it when it’s idling without working. But when the vacuum pump is operating, the pressure at the inlet is very low, while the pressure at the outlet is at atmospheric level; in other words, the pressures at the two positions of the liquid ring are different. How can the liquid ring remain stable then? 2. How does the water ring pump replenish water? I couldn’t understand the schematic diagram shown on the website; what is the path for water replenishment? I hope to receive guidance from all the seniors!
Top tier, seeking guidance:hug:
An appropriate amount of water is placed in the pump body as the working fluid. As the impeller rotates clockwise as shown in the diagram, water is thrown out in all directions by the impeller; due to centrifugal force, the water forms a closed ring of approximately uniform thickness, shaped according to the geometry of the pump chamber. The inner surface of the lower part of the water ring is in exact tangency with the impeller hub, while the inner surface of the upper part of the water ring is in contact with the tips of the blades (in fact, the blades extend to a certain depth within 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 by the impeller into several small chambers, one for each blade. If 0° at the lower part of the impeller is taken as the starting point, then when the impeller has rotated 180°, the volume of the small chamber increases and it becomes connected to the suction port on the end face; at this point, gas is drawn in. Once suction is complete, the small chamber becomes isolated from the suction port ； As the impeller continues to rotate, the small cavity becomes smaller, causing the gas to be compressed ； When the small chamber is connected to the exhaust port, the gas is expelled outside the pump.
Thank you for the guidance: handshake. I now basically understand the principle. There is another question: where does the water used for replenishment enter the pump? I still haven’t figured that out: Q