Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1993-07-15
1994-10-25
Dang, Hoang C.
Wells
With below and above ground modification
Eduction pump or plunger in well
188 712, 417214, F04B 4910
Patent
active
053580362
ABSTRACT:
A relatively simple hydraulically operated disc brake mechanism for drive systems which store reactive torque by reason of being under torsion is disclosed. Certain drive systems such as the drive strings for deep well submersible pumps store considerable reactive torque due to torsional stresses. Such torque must be controllably released if drive power is interrupted. The disc brake mechanism includes a housing that defines a reservoir for lubricating oil for the bearings of a shaft that drives a bi-directional hydraulic pump. When the shaft turns in an operating direction, the pump pumps the lubricating oil in a closed circuit through a filter and back to the reservoir. If normal operation is interrupted and the reactive torque in the system is released, the bi-directional pump forces oil through a control manifold to a disc brake caliper which brakes a disc rotor attached to the shaft. The faster the shaft turns as it releases reactive torque, the more braking force applied. As reactive torque is released, pump speed drops and brake force is correspondingly reduced until all reactive torque is released from the drive string permitting safe handling and soft restart of the drive string. The advantage is much improved safety and a self-regulating brake mechanism that handles power interruptions without manual intervention.
REFERENCES:
patent: 2518701 (1950-08-01), Luenberger
patent: 3536169 (1970-10-01), Arnold
patent: 4017217 (1977-04-01), Lamers
patent: 4216848 (1980-08-01), Shimodaira
patent: 4797075 (1989-01-01), Edwards et al.
patent: 4993276 (1991-02-01), Edwards
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