Take you in-depth understanding of the classification of oil-free rotary vane vacuum pump. There are two kinds of vacuum pumps, but they are not suitable for removing gases with high oxygen content, corrosive to metal, chemical reaction with pump oil and dust particles.
Oil free rotary vane vacuum pump is one of the most basic vacuum equipment in vacuum technology. Rotary vane vacuum pumps are mostly small and medium-sized pumps. There are two kinds of oil-free rotary vane vacuum pump: single-stage oil-free rotary vane vacuum pump and double-stage oil-free rotary vane vacuum pump. The so-called two-stage, is in the structure of two single-stage pumps in series. Generally, it is made of two stages to obtain higher vacuum.
The classification of oil-free rotary vane vacuum pump includes 2XZ oil-free rotary vane vacuum pump, 2X-A double-stage oil-free rotary vane vacuum pump, SV oil-free rotary vane vacuum pump, RV oil-free rotary vane vacuum pump and DE-V oil-free rotary vane vacuum pump.
2XZ oil-free rotary vane vacuum pump is one of the basic equipment used to extract gas from sealed container. It can be used alone, or as a pre pump of booster pump, diffusion pump, molecular pump, maintenance pump and titanium pump.
DE-V oil-free rotary vane vacuum pump is a single cascade shaft structure. Its working performance is high speed, low noise, fast pumping speed and high efficiency. The pump only needs air cooling. It has anti oil return structure to prevent pump oil from returning to the system being pumped. The pump is equipped with an exhaust filter, which can effectively eliminate oil mist, balance operation, small vibration, and can work under any pressure.
SV oil-free rotary vane vacuum pump is a rotary vane oil seal single-stage vacuum pump. The basic equipment used to extract the gas from a sealed container to obtain a vacuum.
RV type oil-free rotary vane vacuum pump is a kind of oil sealed mechanical vacuum pump. It belongs to low vacuum pump and can be used alone. It can also be used as the front stage pump of other high vacuum pumps or ultra-high vacuum pumps.
The vane of rotary vane vacuum pump divides the crescent shaped space formed by rotor, pump chamber and two end covers into three parts a, B and C. when the rotor rotates in the direction of arrow, the volume of space a connected with the suction port is gradually increased and is in the process of suction. The volume of space C connected with the exhaust port is gradually reduced and is in the process of exhaust. The volume of space B in the middle is also gradually decreasing and is in the process of tightening.
Because the volume of space a is gradually increased (that is, expansion), the gas pressure is reduced, the external gas pressure at the pump inlet is greater than the pressure in space a, so the gas is inhaled. When space a is isolated from the suction port, i.e. it turns to the position of space B, the gas begins to be compressed, the volume gradually reduces, and finally communicates with the exhaust port. When the compressed gas exceeds the exhaust pressure, the exhaust valve is pushed open by the compressed gas, and the gas is discharged into the atmosphere through the oil layer in the oil tank. By the continuous work of the pump, to achieve the intention of continuous pumping. If the discharged gas is transferred to another stage (low vacuum stage) through the airway, it is pumped out by the low vacuum stage, and then compressed by the low vacuum stage and discharged into the atmosphere, which is a two-stage pump. At this time, the total tightening ratio is borne by two stages, so the limit vacuum is increased.