The composition and characteristics of vacuum pump is introduced

by:J&T     2020-05-28
Vacuum pump components

( 1) The overall structure of the pump type

vacuum pump to the layout of the pump body structure determines the overall structure of the pump.

the vertical structure of inlet and outlet horizontal layout, easy assembly and connection pipe. However, this kind of pump high center of gravity, high-speed stability, so this kind of pump is mainly used for small pump.

, above the entrance to the horizontal pump export below. Sometimes, vacuum system to facilitate pipeline installation and connection, vent can from the horizontal connections, the air intake and exhaust direction perpendicular to each other. At this point, the vent can be opened from the left or the right direction, and in addition to one end of the exhaust pipe, another end is blocked or connected to the bypass valve. When the pump low center of gravity, high-speed stability is good. In general, large and medium-sized pump all adopt the structure.

the two rotor axis perpendicular to the horizontal plane of the pump installation. The structure of the assembly clearance is easy to control, the rotor assembly is convenient, pump cover an area of an area small. However, pump high center of gravity, gear, dismantling inconvenient, lubrication mechanism is relatively complex.

( 2) transmission way

the two vacuum pump rotor through a pair of high precision gear relative to run synchronously. The drive shaft through the shaft coupling and motor connection. Transmission structure mainly has two types: one is the motor and gear placed on the same side of the rotor is shown in figure. Directly driven by the end of the motor rotor gear drive, drive rotor shaft torsional deformation is small, the gaps between the rotor will not happen because the drive shaft torsional deformation is great changes, so that the clearance between the rotor even at runtime. The biggest drawback is the drive for: a. Three shaft bearings, increased the difficulty of processing and assembling of the pump, removal and adjustment of the gear is not convenient; b。 The center of gravity of the overall structure is not symmetrical, pump to motor and gear box.

the characteristics of vacuum pump ( 1) In a wide range of pressure greater pumping speed;

( 2) Good rotor geometry symmetry, small vibration, stable running. Between the rotor and clearance between rotor and shell, do not need lubrication, friction loss is small, can greatly reduce the driving power, higher speed;

( 3) Don't need to seal and lubrication pump room, can reduce the pollution of oil on the vacuum system of steam;

( 4) room no compression or exhaust valve. Simple and compact structure, is not sensitive to pumping gas of the dust and water vapor.

( 5) Compression is relatively low, the impact on hydrogen extraction is poorer;

( 6) For complex surface, the cylinder is in the shape of the rotor surface processing and testing.

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