Constitute the introduction of water ring vacuum pump and works
|Constitute the introduction of water ring vacuum pump and works
Ring vacuum pump (referred to as water ring pumps) is a rough vacuum, extreme pressure it can get, for a single-stage pump 2.66 ~ 9.31kPa; for a two-stage pump is 0.133 ~ 0.665kPa. The water ring pump is also used as a vacuum compressor, it belongs to the low-pressure compressor, the pressure range of (1 ~ 2) X105Pa gauge pressure (under certain conditions). Water ring pumps in many processes in petroleum, chemicals, machinery, mining, light industry, paper, power, metallurgy, pharmaceutical and food industries and other municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration and vacuum resurgence, etc., has been widely used, because the water ring pump gas compression process is isothermal, it can be exhausting flammable, explosive gas, but can also dust extraction, water gas Therefore, the application of the water ring pump is increasing.
Impeller is eccentrically mounted in the pump body, when the impeller rotates in the direction shown, into the water ring pump impeller pump water is thrown around, due to centrifugal force, the water forms a pump chamber with a shape similar to the constant thickness the closed water loop. The upper surface of the water ring and impeller hub exactly tangent to the inner surface of the lower water ring just in contact with the blade tip (in fact, the blades in the water, there is a certain ring insertion depth). At this time, formed between the impeller hub and a crescent-shaped water ring space, and this space has been divided into a number of impeller blades is equal to several small chambers. If the upper part of the impeller 0 ° as a starting point, then the impeller rotating 180 °, the volume of the small chamber gradually from small to large (ie from section Ⅰ-Ⅰ to Ⅱ-Ⅱ), the pressure continues to decrease, and with suction air intake port connected disk, when the pressure is lower than the small chamber space is pumped pressure vessel, according to the principle of equilibrium gas pressure, gas is pumped constantly being pumped into the small chamber at this time is in the inspiratory process.
When the suction complete with suction port isolation, from Ⅱ-Ⅱ to Ⅲ-Ⅲ section, the small chamber volume is gradually decreasing, continually increasing the pressure, this time is in the compression process, when the compressed gas in advance to reach emission when the gas pressure from the auxiliary exhaust valve exhaust advance. From section Ⅲ-Ⅲ to Ⅰ-Ⅰ, while the volume of the exhaust port communicating with the small chamber further reduced pressure further increases, when the pressure is greater than the exhaust gas pressure, the compressed gas from the exhaust port is discharge, in continuous operation of the pump, the constant suction, compression and exhaust process, so as to achieve continuous pumping.
In the water pump, the auxiliary exhaust valve is a special structure, generally using a rubber ball, and its role is to eliminate over-compression and compression shortage generated by the pump during operation. These two phenomena will cause excessive power consumption. Because there is no direct water ring pump exhaust valve, and the exhaust gas pressure is always fixed, the water ring pump of the compression ratio depends on the starting position of the intake port and an exhaust port of the end position, but the two positions are fixed constant, and therefore not suited to the needs of the suction pressure changes. To solve this problem, the exhaust port is generally disposed below the rubber ball valve, so that when the pump discharge pressure reaches premature chamber, valve automatically open, gas is discharged to eliminate the phenomenon of excessive compression. General water ring pumps are designed with a minimum suction pressure to determine the compression ratio, in order to determine the starting position of the exhaust port, this would resolve the compression shortage.