Closure Screw Ejection Prevention in Hydraulic Accumulators
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Solution Overview
Problem
In hydropneumatic devices, improper operation of closure screws during filling and checking processes poses a significant hazard due to the risk of the screw being ejected by gas pressure, especially when power tools are used, leading to potential accidents if safety protocols are not followed.
Innovation Solution
A safety device is implemented that limits the motion of the closure screw to a single path when loosened, using a blocking element anchored in the port to prevent ejection, and an additional torque-limiting mechanism to prevent excessive unscrewing force, ensuring the screw remains threaded and secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power tool is used to loosen the closure screw, then the loosening process is faster and more efficient, but the risk of the screw being ejected by gas pressure increases significantly
Solution Approach 1:
The patent introduces a limiting element that is pre-installed in the port to restrict the maximum movement distance of the closure screw before loosening. This preliminary constraint prevents the screw from being completely ejected even if excessive force is applied with power tools, thereby resolving the contradiction between loosening efficiency and ejection hazard.
2Ease of operation
If the closure screw is loosened by a large amount to ensure complete opening, then the flow path is fully cleared, but the screw may be ejected by gas pressure before complete loosening
Solution Approach 1:
The limiting element is pre-positioned in the port to define the maximum allowable movement of the closure screw. This ensures that the screw can be loosened sufficiently to clear the flow path while simultaneously preventing complete ejection, thus maintaining both operational effectiveness and safety.
Solution Approach 2:
The limiting element acts as an intermediary component between the closure screw and the port. It mediates the loosening process by allowing controlled movement while blocking excessive movement, thereby enabling complete flow path clearance without risking screw ejection.
3Device complexity
If no blocking element is installed, then the device construction remains simple, but the closure screw can be completely ejected creating safety hazards
Solution Approach 1:
The port is segmented into two functional zones: a threaded hole portion for screw engagement and a hollow cylinder portion containing the limiting element. This segmentation allows the limiting element to be added as a distinct component without fundamentally complicating the overall structure, while still providing the necessary safety function.
Solution Approach 2:
The limiting element is designed as a simple, inexpensive component (such as a retaining ring or collar) that can be easily installed and replaced if necessary. Its low cost and simple construction minimize the impact on overall device complexity while effectively preventing screw ejection.
Data Source
AI summary
A safety device for closure elements (1) on pressure-medium-containing tanks, in particular on hydropneumatic devices such as hydraulic accumulators, has a screw connection provided as a closure device on a filling or checking port. The screw connection has a closure screw (1) threadedly engaged on the port (3) and blocking the port (3) when the screw connection is tightened and opens the port (3) when a flow path is released. A device (25) limits the free movement path of the closure element (1) when moved out of a closed position as a result of occurring overpressure.