Working principle of liquid ring vacuum pump

The impeller of Schmied liquid ring vacuum pump is eccentric with the pump shell. The pump shell is filled with a certain amount of water, and the water ring is formed by the rotation of the impeller.When the adjacent blades (red ones in the figure) rotate, the space (air chamber) formed with the water ring becomes larger, that is, the air (air chamber) becomes smaller, that is, the air is compressed.Multiple groups of adjacent blades, namely multiple groups of reciprocating compression.Compact structure, reliable working balance and uniform flow, so the chemical production is mostly used to transport or suction flammable, explosive and corrosive gases.The water ring vacuum pump has low efficiency due to the high energy loss caused by the impeller stirring liquid.

Performance characteristics of liquid ring vacuum pump

Advantages of Schmied liquid ring vacuum pump

1. Simple structure, low manufacturing precision, easy to process.

2, compact structure, high pump revolution, generally can be directly connected with the motor, no reduction device.Therefore, with small structure size, it can obtain large air displacement and small floor space.

3. The compressed gas is basically isothermal, that is, the temperature change of the compressed gas process is very small.

4, because there is no metal friction surface in the pump chamber, there is no need to lubricate the pump, and wear is very small.The sealing between the rotating parts and the fixed parts can be accomplished directly by water sealing.

5. Uniform suction, stable and reliable work, simple operation and convenient maintenance.

Disadvantages of water ring vacuum pump

1, low efficiency, generally around 30%, good up to 50%.

2. Low vacuum, not only due to structural constraints, but more importantly due to the working fluid saturated vapor pressure restrictions.Using water as working fluid, the ultimate pressure can only reach 2000~4000Pa.Oil as working fluid up to 130Pa.

In short, because the water ring pump gas compression is isothermal, it can be removed flammable, explosive gas.Dusty gases, condensable gases and gas-water mixtures can be removed because there is no exhaust valve or friction surface.With these outstanding features, it has been widely used despite its low efficiency