Internal gear pump

摘要

The pump has a casing in which the circumference of an internal gear wheel or internal shaped rotor (2) can slide on a bearing shell (7) engaged with an external gear wheel or rotor (3) so that a crescent-shaped pumping chamber is formed. At least the external circumference of the internal gear wheel or rotor, or the internal circumference of the external one, is fixed to the bearing shell, which is made of a sound-damping plastic material