Water-ring vacuum pump (hereinafter referred to as water-ring pump) is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa, and the air ejector in series can reach 270-670Pa. Water ring pump can also be used as a compressor, called water ring compressor, is attributed to low pressure compressor, its pressure planning is 1 ~ 2 *105Pa gauge pressure.
Water ring pump is used as self-suction pump at the beginning, and then gradually used in many industrial sectors such as petroleum, chemical industry, machinery, mining, light industry, medicine and food.
In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pumps are widely used. Due to the rapid development of vacuum application skills, water ring pumps have always been taken seriously in obtaining rough vacuum. Because the gas in the water ring pump is isothermal, it can extract flammable and explosive gases. In addition, it can also extract dust and water-bearing gases. Therefore, the use of water ring pump is increasing.
The pump body is equipped with appropriate water as working fluid. When the impeller rotates clockwise, the water is thrown to the adjacent area 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 upper part of the water ring is just tangent to the hub of the impeller, and the lower part of the water ring is just in contact with the top of the blade (in practice, the blade has a certain penetration depth in the water ring). At this time, a one-month conodont space is formed between the hub and the water ring of the impeller, and this space is divided by several small cavities with the same number of dividend blades of the impeller. If the starting point is 0 degree above the impeller, the volume of the small chamber increases from small to large when the impeller rotates 180 degrees before rotation, and it is also connected with the suction port on the end face.
When the impeller continues to rotate, the small cavity becomes smaller and larger, making the gas compressed. When the small cavity is connected with the exhaust port, the gas is discharged out of the pump.
In summary, the water ring pump relies on the change of the volume of the pump chamber to complete the suction, contraction and exhaust, so it belongs to the variable volume vacuum pump.
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