F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
F16D 55/00 (2006.01) B60T 13/20 (2006.01) E21B 43/12 (2006.01) F04B 49/10 (2006.01) F16D 55/226 (2006.01) F16D 59/00 (2006.01) F16D 65/14 (2006.01)
Patent
CA 2074013
ABSTRACT OF THE DISCLOSURE When power to the drive for a progressing cavity pump is interrupted, the torsion in the sucker rods used to rotate the pump must be braked, i.e. released in a controlled manner. The centrifugal brakes currently used for this purpose are often unnecessarily structurally complicated and difficult to service. A relatively simple alternative is a hydraulically operated brake system including a hollow shaft mounted on the polished rod at the top end of the sucker rod string for rotation with the latter, a housing defining a reservoir for lubricating oil containing bearings for the hollow shaft, a bi-directional pump connected to the shaft for pumping fluid from a reservoir in the housing in a closed circuit back to the reservoir during rotation of the rod string and shaft in one direction, and for pumping fluid in the opposite direction to a disc brake associated with the shaft and rod string during back spin or reverse rotation of the rod string.
Dunsmuir George H.
Mills Robert A. R.
LandOfFree
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