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Water ring vacuum pump working principle
The application of the water ring vacuum pump is increasing. The water ring vacuum pump (referred to as the water ring pump) is a rough vacuum pump. The ultimate pressure that can be obtained is 2.66 to 9.31 kPa for a single-stage pump and 0.133 for a two-stage pump. ~ 0.665kPa . The water ring vacuum pump can also be used as a compressor. It is a low pressure compressor with a pressure range of ( 1 to 2 ) X105Pa gauge pressure (under certain conditions).
Water ring vacuum pumps in many processes in the petroleum, chemical, machinery, mining, light industry, paper, power, metallurgy, pharmaceutical and food industries and municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, Vacuum evaporation, vacuum concentration and vacuum regain, etc., have been widely used. Since the process of compressing gas by the water ring pump is isothermal, it can remove flammable and explosive gases, and can also remove dust and water. Gas .
The figure shows the working principle of the water ring vacuum pump. The water ring pump is a water ring, an air inlet, an exhaust port, an auxiliary exhaust valve, etc. formed by the impeller, the pump body, the suction and exhaust disk, and the water in the pump body wall. consist of.
The impeller is eccentrically mounted in the pump body. When the impeller rotates in the direction shown, the water entering the pump body of the water ring vacuum pump is thrown around by the impeller. Due to the centrifugal force, the water forms a shape similar to that of the pump chamber. The closed water ring of thickness. The upper inner surface of the water ring is just tangent to the impeller hub (such as the I - I section), and the lower inner surface of the water ring is just in contact with the blade tip (in fact, the blade has a certain depth of insertion within the water ring). At this time, a crescent-shaped space is formed between the impeller hub and the water ring, and this space is divided by the impeller into a plurality of small cavities equal to the number of blades. If the upper portion of the impeller 0 ° as a starting point, then when the impeller rotation of 180 °, the volume of the small chamber gradually from small to big (i.e., from a cross-sectional â… - â… to â…¡ - â…¡), continued reduction in pressure, and with suction The suction ports on the gas disk communicate with each other. When the pressure in the small cavity space is lower than the pressure in the pumped container, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small cavity, and is inhaling at this time. process. When the inhalation is completed, it is isolated from the suction port. From the II - II to III - III section, the volume of the small cavity is gradually decreasing, and the pressure is continuously increasing. At this time, the compression process is in progress, when the compressed gas reaches the row in advance. When the air pressure is applied, the exhaust is advanced from the auxiliary exhaust valve. From the section III - III to I - I, the volume of the small cavity communicating with the exhaust port further reduces the further increase of the pressure. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas is taken from the exhaust port. Exhaust, during the continuous operation of the pump, the process of inhaling, compressing, and exhausting is continuously performed, thereby achieving the purpose of continuous pumping.
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