Progressive Cavity Pump/Motor Drive Mechanism

摘要

A progressing cavity pump has a rotor that moves in an eccentric motion, and is driven by a drive shaft that rotates about a fixed axis. Various means have been used to connect the two; mostly using an intermediate shaft called a connecting rod that has a universal joint at either end. This device replaces that with two parallel plates; one with several pins protruding from it, and the other with the same number of holes in it. The holes are sized to allow the eccentric motion of the rotor. There is also a ball between the two plates to transmit loads between the plates.

主权项

1. A drive coupling mechanism, comprising:
a first plate configured to couple to a shaft having a fixed axis; a second plate eccentrically disposed adjacent to and spatially separate from the first plate, the second plate configured to attach to a rotor having an orbiting axis, wherein a rotation of the rotor produces a circular path of the orbiting axis with a diameter of eccentricity; one of said first plate and said second plate including a first cylindrical bore wall defining a first bore extending longitudinally towards the other one of said first plate and said second plate; a first pin having a first end attached to said other one of said first plate and said second plate, said first pin extending into said first bore and abutting the first cylindrical bore wall, said first pin having a pin diameter, said first bore having a bore diameter, said bore diameter being at least equal to the pin diameter plus the diameter of eccentricity of the orbiting axis to allow rotation of the rotor and the shaft via the drive coupling mechanism.