How to choose the suitable liquid ring ( Water ring) Vacuum pump -

it is reported that the liquid ring vacuum pump as the proportion of materials with a range of small, high strength, corrosion resistance, has good corrosion resistance, compact structure, energy-saving advantages of high efficiency, reliable operation, better solve the shortcomings of the original pump products, suitable for pumping or suppressing air, corrosive gas and liquid slag and water, organic matter, suspended particles or crystals, and pharmaceutical industries, used in vacuum, vacuum filter, vacuum drying, vacuum concentration, vacuum evaporation, vacuum distillation, vacuum crystallization, plastic molding, etc.

the personage inside course of study points out, especially for the chemical industry, pharmaceutical industry has seen the by-products such as hydrogen chloride gas, corrosive liquid ring vacuum pump can effectively extract corrosive gas and compression, the by-product gas such as formation of high concentration of hydrochloric acid, not only conforms to the requirements of environmental protection, and the formation of circular economy.

at present, there are many types of liquid ring vacuum pump on the market, many customers reflect they don't know how to choose the type. In response, some enterprise technical personnel's choice of liquid ring vacuum pump is put forward four Suggestions, hope to provide some references for the industry.

choose as far as possible of the specifications of the rotational speed is low.

as we have learned, at present our country there are many kinds of speed liquid ring vacuum pump in the same specifications to choose from. Which due to the impeller diameter is larger and larger specifications of pump speed is low, so, under the premise of the same quantity of pumping, should choose as far as possible speed lower pump, which is less than the power of consumption, high efficiency.

in addition, the larger the size of the liquid ring vacuum pump with smaller energy loss, the energy loss is due to a long blade length, curvature is small, the approximate linear fluid flow and fluid flow near the slow flow of the secondary vortex in fluid flow and boundary layer.

should consider the influence of water temperature.

it is reported that the performance curves of liquid ring vacuum pump technology at home and abroad documents and technical data is on the premise of inlet water temperature of 15 ℃. When choosing liquid ring vacuum water pump, therefore, should give full consideration to the actual water temperature on the influence of the volume of a gas.

the personage inside course of study says, because the majority of Chinese users of make-up water temperature between 25 ℃ and 35 ℃. Therefore, when choosing a pump, increase air volume according to the requirements of technical documents.

to consider the influence of the suction resistance

because of the gas extraction sites often in the coal mine, away from the liquid ring vacuum pump ( Some coal mines to several kilometers) , and the extraction pipe is too long, extraction resistance loss should be considered, and the coal mine system by calculation formula used in the extraction resistance. When decorate line, coarser suction pipe, should be adopted to reduce the resistance loss, to minimize the right-angle bend, reach the purpose of improving the efficiency of suction.

the choice of the micro positive pressure exhaust

it is reported that at present, some coal mines had to be drawn or compressed gas emissions to the distance to the gas tank, the exhaust pressure in 0. 02 - 0. 05 between mpag. Because the liquid ring vacuum pump performance curve of technical documents and technical data are all in the exhaust pressure for a standard atmospheric pressure condition, therefore should consider when selecting the increase of the exhaust pressure and pump the increase of the interior flow's influence on the swept volume.

in addition, due to the increase in exhaust pressure, pump shaft power increase, form a complete set of drive power should also be increased. In this case, the manufacturer shall be provided in the process of choosing test performance curve and the corresponding technical data, to fully meet the requirements of users.