The working principle of water ring vacuum pumps and constitute ( 2)

the auxiliary exhaust pneumatic valve is a kind of special structure, water ring pump. Generally USES the rubber ball pneumatic valve, the function is to eliminate pump in the operation process of compression and compression of insufficient phenomenon. The two phenomena can cause excessive power consumption. Because there is no direct water ring pump exhaust pneumatic valve, and exhaust pressure is always fixed water ring pump compression ratio't decided to port of termination of the starting position of the location and vent, however, the two position is fixed and therefore not meet the needs of the suction pressure changes. In order to solve this problem, generally set the rubber ball at the bottom of the vent pneumatic valve, so that when it comes to an exhaust pressure pump cavity early, pneumatic ball valve automatically opens, the gas discharge, eliminates the phenomenon of compression. Generally when designing water ring pump on the basis of the minimum suction pressure to determine the compression ratio, in order to determine the starting position of exhaust outlet, thus solve the lack of compression phenomenon.
the extreme pressure obtained, ring vacuum pump ( Hereinafter referred to as water ring pump) A coarse vacuum pump. For single-stage pump is. 。 For the kPa for double pump. 。 KPa water ring pump can be used as a compressor, belongs to low pressure compressor, its scope of pressure ( XPa gauge pressure ( Specific conditions) Water ring pump in petroleum, chemical industry, machinery, paper making, power, metallurgy, mining, light industry, medicine and food industries and municipal and agricultural departments of many processes, such as vacuum filter, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration and vacuum resurgence, etc. , widely used, because the water ring pump process of compressed gas is isothermal pumping flammable, explosive gas, also can smoke dust, water gas, therefore, the application of water ring pump mounting.
water ring pump is made up of the impeller, pump body, vacuum exhaust plate, water in the form of water ring pump body wall, intake and exhaust, auxiliary exhaust and other components of the pneumatic valve
when the impeller rotates in the direction shown by the chart, the impeller was eccentric device in the pump body. Pump body into the water ring pump impeller water to be thrown around, due to the effect of centrifugal force, the water formed a similar to the pump cavity shape such as the thickness of the closed water ring. Water ring on the division of appearance coincided with the impeller wheel tangent, water ring in the lower part of the appearance coincided with the top blade contact ( In fact, the leaves in the water ring there a certain insertion depth) At this point, the impeller wheel, water ring formed between a crescent-shaped space, this space is divided into impeller and blade is equal to the number of a number of small cavity. If starting point is ° at the top of the impeller, the impeller before rotating °, small cavity volume gradually changed from small to big, That is, from the section Ⅰ - Ⅰ to Ⅱ - Ⅱ) Reduced pressure constant, and with the intake of the suction or discharge plate, when the pressure inside the small cavity space is less than the pressure of the pump container, according to the principle of gas pressure balance, is pumped gas has at times been siphoned into 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 reduced, the pressure increases from time to time, right now is in the compression process, when it comes to an exhaust pressure of compressed gas in advance, forward from the auxiliary exhaust pneumatic valve exhaust. From the section Ⅲ - Ⅲ to Ⅰ - Ⅰ and interlinked with vent small cavity volume further decrease the pressure rise further, when the pressure is greater than the exhaust pressure of the gas, the compressed air to escape from the vent is in the process of the continuous operation of the pump, the suction, compression, exhaust process from time to time, so as to achieve the purpose of continuous extraction