Fluid Flow Hat Attachment for Actuated Valve Stability
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Solution Overview
Problem
Synthetically commutated fluid working machines face challenges in maintaining actuated valves that withstand significant fluid flow forces, leading to unwanted valve closure and increased service costs due to the complexity of manufacturing and attaching fluid barriers, also known as fluid hats, which require frequent replacement.
Innovation Solution
A valve unit design featuring a fluid flow influencing unit with a larger circumferential extent for attachment to the valve body, combined with additional fixation means like connecting wires or snap rings, to enhance mechanical strength and simplify attachment and replacement, while minimizing fluid flow resistance and allowing for easy servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluid barrier (fluid hat) is attached to the valve body to shield the valve from fluid flow forces, then the valve closure stability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The fluid hat is designed as a separate, detachable component from the valve body, allowing it to be manufactured independently and attached later. This segmentation simplifies the manufacturing process for each component and reduces overall device complexity while maintaining the protective function against fluid flow forces
Solution Approach 2:
The patent introduces an intermediary attachment mechanism (such as a retaining ring or clamp) that connects the fluid hat to the valve body. This intermediary element simplifies the attachment process and reduces the complexity of integrating the fluid hat directly into the valve body structure
2Ease of repair
If the fluid barrier is manufactured as a separate component requiring attachment, then the ease of replacement is improved, but the attachment mechanical strength may be compromised
Solution Approach 1:
The attachment mechanism is designed to be dynamically secure during operation, using features such as elastic retaining rings or snap-fit connections that provide strong mechanical attachment under operating conditions while allowing for easy removal when needed for maintenance or replacement
Solution Approach 2:
The patent employs flexible attachment elements (such as elastic retaining rings or flexible clamps) that can deform during installation to engage with the valve body, then maintain strong mechanical strength during operation. These flexible elements provide both secure attachment and ease of replacement
3Strength
If the fluid hat circumferential extent is increased to improve attachment strength, then the attachment mechanical strength is improved, but the fluid flow resistance increases
Solution Approach 1:
The fluid hat is designed with non-uniform circumferential extent, providing larger attachment circumference in regions where mechanical strength is needed (such as at the attachment interface with the valve body) while maintaining minimal circumferential extent in regions where fluid flow passes through, thereby reducing fluid flow resistance in those critical flow paths
Data Source
AI summary
The invention to a valve unit (1) for a synthetically commutated fluid working machine (51), comprising a valve body (19,57), a movably arranged valve unit (3) and a separate fluid flow influencing unit (13, 25, 31, 35, 46, 56). The fluid flow influencing unit (13, 25, 31, 35, 46, 56) comprises a fluid flow influencing means part (18) and an attachment means part (28, 34, 38) for mechanical connection with the valve body (19). The attachment means part (28, 34, 38) and the fluid flow influencing unit (18) are connected to each other by a connection means part (27, 30, 33, 40, 47). The circumferential extent of the attachment means part (28, 34, 38) is larger as compared to the circumferential extent of the connection means part (27, 30, 33, 40, 47).