Self-Tightening Pump Cover Retaining System
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Solution Overview
Problem
High pressure pumps in the petroleum industry face issues with retaining covers loosening due to vibrations, leading to potential fluid ejection and safety concerns, necessitating frequent maintenance and efficiency degradation.
Innovation Solution
A self-tightening retaining system with a locking device that includes a fastener with opposite-threaded spirals, ensuring the cover remains secured by tightening when attempting to loosen, preventing unintended rotation and fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retaining cover is secured in the access port using high torque with a sledge hammer and tool, then the closure is firmly held at its installed position, but the retaining cover is subject to inadvertently loosen due to pump vibration
Solution Approach 1:
The fastener uses threads spiraled in the opposite direction to the cover threads. When the cover rotates in the loosening direction due to vibration, the fastener instead tightens in the closure hole, converting the harmful loosening rotation into a beneficial tightening action that stops further rotation.
Solution Approach 2:
The pump vibration that causes the cover to loosen is converted into a beneficial force. The opposite-threaded fastener transforms the loosening rotation into tightening action, so the harmful vibration actually tightens the fastener and stops the cover from backing out.
2Reliability
If the retaining cover is tightly secured to prevent loosening, then safety is enhanced, but the system complexity increases with additional locking components
Solution Approach 1:
The fastener is nested within the closure hole, with its head bearing against the inner wall of the hole. The locking function is embedded within the existing closure structure rather than adding external locking components, achieving safety without excessive complexity.
Solution Approach 2:
The opposite-threaded fastener creates a self-locking mechanism. When the cover attempts to loosen, the fastener automatically tightens in response, providing self-correcting security without requiring external monitoring or additional active locking components.
3Ease of operation
If the retaining cover is designed to be easily removable for maintenance, then ease of operation is improved, but the cover may loosen during operation due to vibration
Solution Approach 1:
The fastener's opposite threading inverts the effect of vibration: during operation, loosening rotation tightens the fastener; during removal, intentional rotation in the tightening direction loosens the fastener, enabling easy removal while preventing accidental loosening.
Solution Approach 2:
The system dynamically adapts to operational conditions. The fastener automatically adjusts its clamping force based on the direction of rotation caused by vibration, tightening when loosening occurs and allowing intentional removal when rotated in the opposite direction.
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 system effectively prevents the retaining cover from loosening during pump operation, enhancing safety and maintaining efficiency by ensuring the closure remains sealed, reducing the need for frequent maintenance and backup pumps.
Implementation Method 1
The fastener has external threads interengageable with threads of the hole. The threads of the cover and the threads of the fastener are spiraled in opposite directions such that when the cover rotates in the loosening direction, the fastener becomes tightened in the hole of the closure thereby stopping the rotation.
Data Source
AI summary
A self-tightening retaining system for securing a closure in position closing an access port of a pump housing. The system includes a retaining cover for obstructing removal of the closure from a bore of the access port. The cover has external threads interengageable with screw threads of the bore. A locking device is configured for being secured to the cover such that the locking device rotates together with the cover. The locking device has a fastener receivable in a hole of the closure and has external threads interengageable with threads of the hole. The threads of the cover and the threads of the fastener are spiraled in opposite directions such that when the cover rotates in a loosening direction, the fastener becomes tightened in the hole of the closure thereby stopping the rotation.