Water ring vacuum pumps were originally used as self-priming pumps. It is composed of impeller, pump body, suction and exhaust plate, water ring formed in pump body wall, suction port, exhaust port, auxiliary exhaust valve and so on.
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 pump is widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid more attention to in crude vacuum. As the water ring pump gas compression is isothermal, it can be removed flammable, explosive gas, in addition to the extraction of dust, water containing gas, therefore, water ring pump applications are increasing.
The pump body is provided with an appropriate amount of water as the working fluid. When the impeller rotates clockwise in the figure, water is thrown around by the impeller. Due to the effect of centrifugal force, water forms a closed ring of approximately equal 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 inner surface of the upper part of the water ring is just in contact with the tip of the blade (in fact, the blade has a certain insertion depth in the water ring). At this time, a crescent shaped space is formed between the hub of the impeller and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If the bottom of the impeller 0 ° as starting point, so in front of the rotating impeller 180 ° when small cavity volume changes from small to big, and with suction mouth on the face, the gas is inhaled, when the suction at the end of the small cavity is isolated from the rest of inspiratory mouth; When the impeller continues to rotate, the small cavity changes from large to small, so that the gas is compressed. When the chamber is connected with the vent, the gas is discharged from the pump.
To sum up, water ring pump is to achieve suction, compression and exhaust by the change of pump chamber volume, so it belongs to the variable volume vacuum pump.
The impeller is mounted eccentrically in the pump body. When the impeller rotates, the water entering the pump body is thrown around by the impeller. Due to the effect of centrifugal force, the water forms a closed water ring of equal thickness similar to the shape of the pump chamber. The inner surface of the upper part of the water ring is just tangent to the hub of the impeller, and the inner surface of the lower part of the water ring is just in contact with the tip of the blade. At this time, a crescent space is formed between the hub and the water ring of the impeller, and this space is divided into several small cavities equal to the number of blades by the impeller. If the upper part of the impeller 0 ° as starting point, and then in front of the rotating impeller, 180 °, the small cavity volume gradually changed from small to big, the pressure reduced constantly, and the mines with suction mouth of the suction or discharge tray, when the pressure inside the small cavity space is less than the pressure of the pump container, according to the principle of balance of gas pressure, the gas is pumped continues to be draw in small cavity, is in the process of suction. Breathe when complete with inspiratory mouth isolation, from Ⅱ - Ⅱ to Ⅲ - Ⅲ section, the volume of the small cavity is gradually decreases, and the pressure increases continually, at this time is in the compression process, when it comes to an exhaust pressure of compressed gas in advance, forward from the auxiliary exhaust valve exhaust. From the section Ⅲ - Ⅲ to Ⅰ - Ⅰ, interlinked with vent small cavity volume further decrease the pressure rise further, when the gas pressure is greater than the exhaust pressure, the compressed air to escape from the vent is in the process of the continuous operation of the pump, continuously carrying on the suction, compression, exhaust process, so as to achieve the purpose of continuous extraction.
Two-stage liquid ring vacuum pump
Single stage liquid ring vacuum pump
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