In the pump chamber of the Roots pump, two "8" -shaped rotors are mounted perpendicular to each other on a pair of parallel shafts and are rotated synchronously by a pair of gears having a transmission ratio of 1 in opposite directions. Between the rotors, between the rotor and the pump housing to maintain a certain gap, you can achieve high-speed operation. As Roots pump is a type of vacuum pump without internal compression, the compression ratio is usually low, so the high and medium vacuum pumps require a 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.
Roots pumps work like Roots blowers. 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 turns over the edge of the exhaust port, when the v0 space communicates with the exhaust side, since the pressure of the exhaust side gas is higher, a part of the gas bounces back into the space v0 to make the gas pressure suddenly increase. When the rotor continues to rotate, the gas is discharged outside the pump.
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