Vacuum pump is a device for removing gas molecules from sealed space to leave part of vacuum. the first vacuum pump was invented by Otto von Glick (Otto von Guericke) in 1650, followed by an aspirated pump, which can be traced back to ancient times.
Several vacuum pump of advantages and disadvantages
Several common vacuum pumps in chemical industry and their advantages and disadvantages:
1. Several vacuum pumps frequently used in chemical industry — common vacuum pumps in chemical industry can be simply divided into variable volume vacuum pumps and ejector vacuum pumps. Variable volume vacuum pumps are devices that use the periodic change of pump chamber volume to complete suction and exhaust. reciprocating vacuum pumps, rotary vane vacuum pumps, slide valve vacuum pumps, liquid ring vacuum pumps and roots vacuum pumps belong to variable displacement vacuum pumps. Jet vacuum pump is a kind of momentum transfer pump which uses the high-speed jet produced by the pressure drop of Venturi effect to deliver gas to the outlet. Water jet vacuum pump, steam jet vacuum pump, steam water series jet vacuum pump and steam water combination jet vacuum pump belong to jet vacuum pump.
2. Working principle, advantages and disadvantages of variable volume vacuum pump
(1) reciprocating vacuum pump, rotary vane vacuum pump, piston vacuum pump and roots vacuum pump draw in, compress and discharge gas by reciprocating movement or rotation of piston. Their advantage is that the vacuum degree of the new pump is relatively high, but the piston is a running part, so the wear of the piston can not be avoided. With the increase of maintenance times, the working vacuum degree will continue to decline until it can not meet the production requirements. This kind of pump has many disadvantages, such as high noise, high fuel consumption and high failure rate. Generally, it needs to open a standby pump, which increases the equipment investment and operation cost. In addition, if this kind of pump is used to pump water vapor and other condensable gases, the lubricating oil will be emulsified, so it can only be used to pump non condensable (air) gases, and it can not pump medium with particles, which limits its application scope.
(2) the liquid ring vacuum pump is rotated by eccentric rotor with multiple blades installed inside the pump casing, and the water is thrown into the pump shell to form a liquid ring concentric with the pump shell. The liquid ring and the rotor blade form a volumetric periodic variation, thereby inhaling, compressing and discharging the gas. The advantages of the utility model are that the air volume is large when the vacuum is low, and the condensable gas such as water vapor can be directly pumped. Its disadvantages are low vacuum; it can’t pump the medium with particles; it’s not easy to do anti-corrosion treatment when the rotor rotates at high speed, so it can’t pump the corrosive medium.
3. Working principle, advantages and disadvantages of jet vacuum pump
Jet vacuum pump is a kind of momentum transfer pump which uses the high-speed jet produced by the pressure drop of Venturi effect to deliver gas to the outlet. It is divided into water jet vacuum pump, steam jet vacuum pump, steam water series jet vacuum pump and steam water combined jet vacuum pump. Jet vacuum pump is widely used in the chemical process because of its wide range of vacuum degree, direct extraction of condensable gases such as steam and granular medium, simple structure, convenient operation, small maintenance amount without running parts, energy saving and consumption reduction.
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