Bladder Surge Suppressor Assembly That Prevents Twist During Tightening
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Solution Overview
Problem
Surge suppressor bladders are prone to damage during installation due to twisting or turning within the surge tank, which can impair their operation and service life, and existing solutions often require exotic materials or techniques, limiting retrofit compatibility with existing surge tanks.
Innovation Solution
A bladder and attachment member assembly featuring a valve stem with surface features that register with complementary surface features on attachment members, preventing rotational movement during tightening, and using a locknut to achieve desired torque without damaging the bladder, ensuring proper installation and compatibility with existing surge tanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bladder is installed using conventional attachment members without rotational fixation, then the installation process is simpler, but the bladder is prone to twisting or turning during tightening which can damage the bladder
Solution Approach 1:
The attachment member incorporates asymmetric keyway features including a keyway in the attachment member and a corresponding protrusion on the valve stem. This asymmetric geometry prevents rotational movement of the bladder during tightening by creating a mechanical interlock that only allows insertion in the correct orientation, thereby protecting the bladder from twisting damage while adding minimal structural complexity
Solution Approach 2:
The attachment member acts as an intermediary component between the valve stem and the surge tank flange. It includes a flange portion that interfaces with the surge tank and a valve stem portion that interfaces with the bladder valve stem, with keyway features that prevent rotation. This intermediary structure protects the bladder from rotational damage during installation while maintaining compatibility with existing surge tanks
2Reliability
If exotic materials or techniques are used to prevent bladder rotation, then bladder protection during installation is improved, but compatibility with existing surge tanks is reduced
Solution Approach 1:
The attachment member is designed with a universal interface that includes a flange portion configured to interface with the flange of an existing surge tank and a valve stem portion that interfaces with the bladder valve stem. This multi-functional design allows the same attachment member to provide both rotational prevention and secure mounting in existing surge tanks, enabling retrofit applications without requiring exotic materials or techniques
Solution Approach 2:
The asymmetric keyway features (keyway in attachment member, protrusion on valve stem) provide a simple geometric solution that prevents rotation using standard manufacturing techniques. This asymmetric interlock mechanism is compatible with existing surge tank flanges and standard valve stems, allowing retrofit installation without requiring exotic materials or specialized techniques
3Ease of operation
If the valve stem is allowed to rotate during tightening, then the tightening process is easier, but the bladder may become twisted or turned which impairs operation and service life
Solution Approach 1:
The keyway and protrusion create a mechanical constraint that guides the valve stem into the correct orientation during insertion. The asymmetric geometry allows easy insertion in the correct orientation while preventing rotation during tightening, protecting the bladder from twisting damage that would impair operation and reduce service life
Solution Approach 2:
The attachment member serves as an intermediary that transfers the tightening force from the flange connection to the valve stem without allowing rotation. The keyway features in the attachment member prevent the valve stem from twisting during the tightening process, thereby protecting the bladder while still allowing the tightening operation to proceed
Data Source
AI summary
A bladder and attachment member assembly for use with a container comprises an elastomeric gas-filled bladder comprising a valve stem. A first attachment member is disposed over the valve stem within the container with the bladder. A second attachment member is disposed over the valve stem and over the first attachment member. The second attachment member is outside of the container interposed between the valve stem and a container opening. Rotational movement of the valve stem is fixed relative to one or both of the first and second attachment members. In an example, the valve stem comprises one or more surface features that register with one or more surface features of the first and/or second attachment member to thereby fix relative valve stem rotational movement. In an example, the valve stem surface feature is a flat surface that registers with a flat surface of the second attachment member inside diameter.