Hinged Centering Device for Waveguide Position Stability
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Solution Overview
Problem
Conventional spacers for rod or cable-like waveguides in industrial level measurement systems are expensive, prone to mechanical stress, and can interfere with measurements due to signal reflection from pooled media, especially in turbulent conditions where the waveguide may shift and touch vessel walls or stilling wells, leading to inaccurate readings.
Innovation Solution
A centering device with a hinged body and radially extending arms, featuring a clasp mechanism and grippers, is designed to securely attach to the waveguide, preventing contact with vessel walls and allowing for adjustable length, made from non-conductive materials with low dielectric constants to minimize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional spacers are used to hold the waveguide in position, then the waveguide position stability is improved, but the measurement precision deteriorates due to signal reflection from pooled media on the spacer surfaces
Solution Approach 1:
The spacer features a curved outer surface that slopes downward from the top toward the bottom, preventing flat surfaces where media could pool. This curvature ensures that process media flows off the spacer surface rather than accumulating, eliminating the source of spurious radar signal reflections while maintaining the spacer's position-holding function
Solution Approach 2:
The spacer incorporates different surface characteristics in different regions: the outer surface is curved and sloping to prevent media pooling, while the inner surface maintains appropriate features for securing the waveguide. This localized differentiation allows the spacer to simultaneously prevent measurement interference and maintain positioning stability
2Ease of operation
If spacers are made from machined materials to ensure secure attachment, then the ease of operation is improved, but the manufacturing cost increases
Solution Approach 1:
The spacer is manufactured from molded material rather than machined material, representing a fundamental change in the manufacturing parameter. This molding approach reduces manufacturing cost while the design incorporates molded-in features such as the curved outer surface and internal securing structures that maintain ease of operation and secure attachment
Solution Approach 2:
The spacer design combines multiple functions into a single molded component: position holding, waveguide securing, and media runoff prevention. This integration eliminates the need for separate machined parts and assembly steps, reducing manufacturing cost while maintaining operational ease
3Strength
If the waveguide is allowed to move freely in turbulent conditions, then the mechanical stress on the waveguide is reduced, but the measurement precision deteriorates due to contact with vessel walls
Solution Approach 1:
The spacer acts as an intermediary element between the waveguide and the vessel wall. It provides a controlled interface that maintains the waveguide's vertical position and prevents contact with the vessel wall or stilling well, while the flexible or adjustable nature of the spacer allows it to accommodate turbulence-induced movements without transmitting excessive mechanical stress to the waveguide
Data Source
AI summary
According to at least one aspect of the present disclosure, a centering device includes a body including a first part and a second part connected by a hinge, the hinge structured to enable the first part and the second part to pivot relatively each other about the hinge to form a center channel extending through the body and defining a center axis. The body further includes a clasp, structured to reversibly hold the first part adjacent the second part in an assembled state, and a plurality of members extending radially from the body where, in the assembled state, the center channel and the clasp structured to reversibly attach to a body passing through the center channel.