Pumping unit with end return for positioning drive
View Patent ↗There are several methods to propel moving force points on a pumping unit. One of the embodiments is propulsion utilizing permanent magnets. This invention can aid the several methods and provides the push start that allows initiating permanent magnet propulsion. This invention relates to an end return device for assisting positioning drives to actuate the continuous movement by mechanical means of moving force points to a desired advantageous position at a desired advantageous moment to achieve reduced net torque when lifting or lowering an unbalanced load with a beam with a fulcrum and connected to a load and an effort. In one embodiment, a walking beam well pumping unit, the lifting and lowering of the well load can be caused by the reciprocating motion of a beam tipping on a fulcrum and with moving effort force point, moving crank shaft force point, and moving beam weight force point.
1. An end return device disposed on a propulsion device of a walking beam pump comprising: a lateral motion of the propulsion device laterally moves a speed reducer crank arm of the walking beam pump; said end return device is configured to do at least one of: initiate lateral motion of the propulsion device; reverse lateral motion of the propulsion device; decelerate lateral motion of the propulsion device; stop lateral motion of the propulsion device.
2. The end return device disposed on the propulsion device of the walking beam pump of claim 1 comprising: the propulsion device includes a permanent magnet; the end return device is configured to change the lateral motion of the propulsion device by applying magnetic force or magnetic resistance to the permanent magnet.
3. The end return device disposed on the propulsion device of the walking beam pump of claim 1 comprising: the propulsion device is a linear motor.
4. The end return device disposed on the propulsion device of the walking beam pump of claim 1 comprising: the end return device is configured to change the lateral motion of the propulsion device by applying any of a spring, hydraulic, pneumatic, elastic, or regenerative force to the propulsion device.
5. The end return device disposed on the propulsion device of the walking beam pump of claim 1 comprising: the end return device is configured to adjust or reduce the torque factor of the speed reducer crank arm.
6. The end return device disposed on the propulsion device of the walking beam pump of claim 1 comprising: the walking beam pump has one of a class 1 level geometry, or a class 2 lever geometry, or a class 3 lever geometry.