Introduction:Water ring vacuum pump (hereinafter referred to as water ring pump) is a kind of coarse vacuum pump, it can get the limit of vacuum for 2000 ~ 4000 pa, pa series air ejector can reach 270 ~ 270.Water ring pump can be used as a compressor, also known as water ring compressor, belongs to low pressure compressor, the pressure range of 1 ~ 2 x 105 pa gauge pressure.
Originally used as liquid ring vacuum pump self-priming pump, and then gradually used in petroleum, chemical industry, machinery, mining, light industry, medicine and food and many other industries.In many industrial production process, such as vacuum filter, vacuum water diversion, vacuum feed, vacuum evaporation, vacuum concentration, vacuum resurgence and vacuum degassing, water ring pump is widely used.Due to the rapid development of vacuum technology, water ring pump in crude vacuum has been paid great attention by people.Because water ring pump in the gas compression is isothermal, so the pumping flammable, explosive gas, it also can smoke in addition to the dust, water, gas, therefore, water ring pump application is increasing.
Water ring vacuum pump working liquid and other suitable liquid, can be applied either working liquid are collectively referred to as liquid ring vacuum pump.Water ring vacuum pump is the most common liquid ring vacuum pump, the most widely used a pump.
Firstly :Water ring pump compared with other types of mechanical vacuum pump has the following advantages:
• simple structure and manufacture accuracy is not high, easy to processing.
• compact structure, the revolutions of the vacuum pump is high, can generally be straight connection with motor, speed reducer is not needed .So with the structure of the small size, you can get large displacement, covers small occupation area also.
• Basically, compressed gas is isothermal, namely the process of compressed gas temperature change is very small.
• Because no metal friction pump cavity surface, the pump inside without lubrication, and wear and tear is small.The seal between the rotating and stationary parts can be directly done by the water seal.
• Breathe in uniform ,work stable and reliable, simple operation, easy maintenance.
Secondly: Water ring pump also has its disadvantages compared with other pump like rotary vane vacuum pump and so on.
• low efficiency, generally around 30%, better can amount to 50%.
• vacuum degree is low, not only because this is limited by the structure of the, more important is restricted by working liquid saturation vapour pressure.Water as working fluid, the limit pressure can reach 2000 ~ 4000 pa.Oil as working fluid, up to 130 pa.