Pump Jack System with Variable Displacement Hydraulic Control
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Solution Overview
Problem
Pump jack systems operating in remote locations face challenges with component failures due to severe service conditions and varying forces, leading to costly repairs and potential damage.
Innovation Solution
A pump jack system driven by an internal combustion engine connected to a rotary type variable output positive displacement pump/motor, with a controller adjusting the flow rate of working liquid to manage forces and optimize operation, reducing energy requirements and minimizing damage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pump jack system operates in remote locations with severe service conditions, then it can maintain continuous pumping operation, but component failures occur frequently leading to costly repairs and potential damage
Solution Approach 1:
The system employs a controller that receives signals from sensors monitoring the pump jack's operational parameters and automatically adjusts the hydraulic motor's flow rate to maintain optimal operation under varying conditions, preventing component failures before they occur
Solution Approach 2:
The system dynamically changes the flow rate parameter of the hydraulic motor based on real-time operational conditions, allowing the pump jack to adapt to severe service conditions and varying forces without component damage
2Use of energy by moving object
If the pump jack system uses a variable output positive displacement pump/motor with flow rate control, then energy requirements are reduced and operation is optimized, but the device complexity increases
Solution Approach 1:
The system uses a hydraulic motor with variable flow rate control to replace traditional mechanical drive systems, reducing energy requirements while the added complexity is managed through automated hydraulic control rather than complex mechanical linkages
Solution Approach 2:
The controller automatically adjusts the hydraulic flow rate based on sensor feedback without requiring external intervention, allowing the system to self-optimize energy usage while minimizing the need for complex external control mechanisms
Data Source
AI summary
An exemplary pump jack system (10) is operable to cause well liquid to be pumped to the surface by a subsurface well pump (29). The exemplary system includes a driver (42) that is in rotatable connection with a pump/motor (48). The pump/motor is a rotary type variable output positive displacement pump/motor that delivers working liquid at a selectively variable flow rate in closed liquid connection to a motor/pump (38). The exemplary motor/pump includes a rotatable output coupler (40) that is in operative connection with a gearbox (34) which causes the pump jack to undergo reciprocating motion. The motor/pump is a rotary type positive displacement motor/pump that is in closed liquid connection with the pump/motor liquid inlet of the pump motor. The pump/motor is operable to deliver working liquid flow therefrom to drive the motor/pump at a selectively variable speed while the driver operates at a generally constant rotational speed. Return force which acts on the motor/pump during at least a portion of the pump jack cycle is operative to cause the motor/pump to urge working liquid toward the pump/motor which assists the driver in pump/motor operation.