Magnetic Shuttle Spool Biasing to Prevent Reciprocating Pump Stall
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Solution Overview
Problem
Reciprocating fluid pumps are prone to stalling when the shuttle spool stops unintentionally at an intermediate position, disrupting the flow of drive fluid between drive chamber conduits, due to lack of stabilization mechanisms.
Innovation Solution
Incorporating magnets within the shuttle valve to create a magnetic field that biases the shuttle spool away from the center position, using a combination of magnets positioned along the spool and on the valve body to generate forces that prevent stalling by maintaining movement towards operational positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no stabilization mechanism is provided, then the device complexity is reduced, but the reliability deteriorates due to stalling at intermediate positions
Solution Approach 1:
The patent replaces complex mechanical stabilization mechanisms (such as springs, cam followers, or mechanical lugs) with a magnetic field-based stabilization system. Magnets are positioned on the spool and/or valve body to create magnetic fields that generate stabilizing forces on the spool, preventing it from stalling at intermediate positions while maintaining structural simplicity
Solution Approach 2:
The magnetic field acts as an intermediary between the magnets and the spool to provide stabilization. The magnetic field transmits force without physical contact, allowing the spool to be held in correct positions or biased away from intermediate positions without requiring direct mechanical intervention or complex positioning mechanisms
2Reliability
If magnets are added to stabilize the spool, then the reliability improves by preventing stalling, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical stabilization mechanisms (such as springs, cam followers, or mechanical lugs) with a magnetic field-based stabilization system. Magnets are positioned on the spool and/or valve body to create magnetic fields that generate stabilizing forces on the spool, preventing it from stalling at intermediate positions while maintaining structural simplicity
Solution Approach 2:
The patent utilizes magnetic field parameters (strength, direction, distribution) to control spool positioning. By adjusting magnet positions, polarities, and field characteristics, the system achieves reliable spool stabilization without adding complex mechanical components, as the magnetic field parameters can be optimized to provide the necessary stabilizing forces
3Productivity
If the spool is allowed to move freely, then the ease of operation is improved, but the productivity deteriorates due to stalling disruptions
Solution Approach 1:
The patent replaces complex mechanical stabilization mechanisms (such as springs, cam followers, or mechanical lugs) with a magnetic field-based stabilization system. Magnets are positioned on the spool and/or valve body to create magnetic fields that generate stabilizing forces on the spool, preventing it from stalling at intermediate positions while maintaining structural simplicity
Solution Approach 2:
The magnetic field acts as an intermediary between the magnets and the spool to provide stabilization. The magnetic field transmits force without physical contact, allowing the spool to move freely between operational positions while being prevented from stalling at intermediate positions, thus maintaining both ease of operation and productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The magnetic stabilization reduces occurrences of stalling, ensuring consistent fluid flow and increasing the efficiency of the reciprocating fluid pump by maintaining the shuttle spool's movement away from the center position.
Implementation Method 1
The magnets are located and configured to impart a force on the spool responsive to a magnetic field such that the spool is magnetically biased away from an intermediate position between the first position and the second position
Implementation Method 2
one or more magnets carried by the spool. The magnets are located and configured to impart a force on the spool responsive to a magnetic field
Data Source
AI summary
A reciprocating fluid pump may include a pump body, one or more subject fluid chambers within the pump body, one or more drive fluid chambers within the pump body, and a shuttle valve for shifting flow of pressurized drive fluid between two or more conduits. The shuttle valve includes a valve body and a spool disposed within the valve body and configured to move between a first position and a second position within the valve body. The shuttle valve also includes one or more magnets carried by the spool. The magnets are located and configured to impart a force on the spool responsive to a magnetic field such that the spool is magnetically biased away from an intermediate position between the first position and the second position.