CIG Two Teeth Lobe Pump

In addition, the external gear represents as two teeth rotor having two opposed teeth (12) and the internal gear represents as three cavity rotor having three cavities (13) stepped in 120 degrees; the two teeth rotor’s involute teeth and the three cavity rotor’s involute cavities are interlocking or their outer cylindrical profiles (14 and 15) revolve on each other; the ratio of the diameter of the three cavity rotor’s cylindrical profile (15) to the diameter of the two teeth rotor’s cylindrical profile (14) is 3/2 and these profiles correspondingly represent as pitch circles for the involute profiles of the three cavity rotor's cavities and the two teeth rotor's teeth; the rotors are fixedly connected with additional interlocked pinions (5 and 6), which have the same pitch circle diameter as their corresponding rotor; their working chamber is hermetically isolated from the rotors’ working chamber through the intermediate cover plate (9), which is rigidly connected to the crescent part.