In the LCX-50 / 0.6 Roots pump chamber, two "8" -shaped rotors are mounted perpendicular to each other on a pair of parallel shafts and are rotated synchronously with each other by a pair of gear belts having a gear ratio of 1 . Between the rotors, between the rotor and the pump housing to maintain a certain gap, you can achieve high-speed operation. As the Roots pump is a type of vacuum pump without internal compression, the compression ratio is usually very low, so the high, medium Roots pump is a non-compressed vacuum pump, the compression ratio is usually very low, so high, the vacuum pump requires foreline pump . Roots pump ultimate vacuum in addition to depend on the pump structure and manufacturing accuracy, but also depends on the foreline pump ultimate vacuum. In order to increase the pump ultimate vacuum, Roots pumps can be used in series. The LCX-50 / 0.6 Roots pump works like a Roots blower. Due to the constant rotation of the rotor, the drawn gas is sucked into the space v0 between the rotor and the pump housing through the air inlet and then discharged through the air outlet. Since inhaled v0 space is completely closed state, so the gas in the pump chamber is not compressed and expanded. However, when the top of the rotor rotates over the edge of the exhaust port, when the v0 space communicates with the exhaust side, part of the gas bounces back into the space v0 due to the higher gas pressure on the exhaust side, causing the gas pressure to suddenly increase. When the rotor continues to rotate, the gas is discharged outside the pump. For the LCX-50 / 0.6 Roots pump rotor from 0 ° to 180 ° of the extraction process. In the 0 ° position, the lower rotor encloses v0 volume of gas from the pump inlet. When turned to the 45 ° position, the chamber communicates with the exhaust port. As the exhaust side of the higher pressure, causing part of the gas back to punch over. When turned to the 90 ° position, the gas enclosed by the lower rotor is vented to the pump together with the backflushing gas. At this time, the upper rotor is also filled with v0 volume of gas from the pump inlet. When the rotor continues to turn to 135 °, the gas enclosed in the upper rotor communicates with the exhaust port, and the above process is repeated. The 180 ° position is the same as the 0 ° position. A total of four v0 volume of gas is discharged during one revolution of the rotor shaft.

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