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The choice of liquid ring vacuum pump note notice? _
liquid ring vacuum pump is a multi blade rotor eccentricity is installed in the water pump shell. When it is rotating, the liquid ( Usually a water) Into the pump casing and formation and the liquid ring pump casing concentric, liquid ring volume with rotor blade, periodic change the rotation of the transfiguration vacuum pump. The most common liquid ring vacuum pump is water ring vacuum pump. This kind of water ring vacuum pump is mainly used for coarse vacuum, the technological process of the swept volume is larger, in chemical, petroleum, light industry sectors has been widely used. The advantage of this kind of pump is: simple structure, manufacturing easy, reliable operation, easy to use, durability is strong, can smoke gas is very big, including corrosive gas, with ash, gas and water mixture,
the following to introduce the choice of liquid ring vacuum pump which should be paid attention to matters of little knowledge.
1, understanding is pumped gas composition, gas contains excluding condensable vapors, presence of dust particles, with or without corrosion, etc. Need to know when choosing a vacuum pump gas composition, gas is pumped to choose appropriate pump. If gas containing particle, and corrosive gas and vapor, should be considered in the pump inlet piping installation of auxiliary equipment, such as condenser, filter, etc.
2, correctly choosing liquid ring vacuum pump working point. Each water pump has a certain working pressure range, such as: LEM series water ring vacuum pump working pressure range 760 MMHG ~ 25 MMHG ( Absolute pressure) In such a wide pressure range, the pumping speed of the pump with pressure changes ( Changes in detail with reference to the performance of the pump curve) , its stable working pressure range is 760 ~ 60 MMHG. Therefore, the working point of the pump should be selected in this area is relatively appropriate, and not let it work for a long time under 25 ~ 30 MMHG.
3, liquid ring vacuum pump oil steam discharged how's impact on the environment. If pollution is not permitted in the environment, can choose oil-free vacuum pump, or the oil steam exhaust to the outside. Vibration of work have influence to the process and the environment. If the process does not allow, should choose no vibration of the pump and adopt measures to prevent vibration. The price of the vacuum pump, operation and maintenance costs.
4, properly combined liquid ring vacuum pump. Because of the selective extraction, thus, sometimes choose a kind of pump can not meet the requirement of the extraction, need several pump combination, complement each other to meet the requirements of extraction. Such as titanium sublimation pump for hydrogen has a high pumping speed, but it can't take helium, and three pole sputtering ion pump, ( Or diode model non-symmetric cathode sputtering ion pump) The argon pumping speed to a certain extent, both together, will make the vacuum unit get good vacuum degree. In addition, some vacuum pump can't work under atmospheric pressure, to a vacuum; Before some vacuum pump outlet pressure is below atmospheric pressure, need to pump, pump old need combined use.
5, its working pressure should satisfy the requirement of the vacuum equipment limit of vacuum and work pressure. Such as: a vacuum drying process requirement of 10 MMHG vacuum degree of work, selection of limiting vacuum of vacuum pump must be at least 2 MMHG, best can reach 1 MMHG. Usually choose limiting vacuum pump is higher than vacuum vacuum equipment work half to one order of magnitude.
6, vacuum equipment requirements for oil pollution. When equipment strict with oil free, should choose all kinds of oil pump, such as: water ring pump, molecular sieve adsorption pump, sputter ion pump, cryogenic water pump, etc. If not strict, you can choose to have the oil pump, add some oil pollution prevention measures, such as a cold trap, mask, block oil well, etc. , can also meet the requirements of clean vacuum.
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