Rotary Joint Shroud With Visual Seal Wear and Spring Set-Up Check
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Solution Overview
Problem
The installation of rotary joints in the paper manufacturing industry is time-consuming and difficult due to the need for accurate measurement of spring compression, and there is a lack of effective indicators for seal ring wear, leading to inefficiencies and potential corrosion of compression springs.
Innovation Solution
A rotary joint design featuring a shroud with alignment rings for easy measurement of spring compression and a seal wear indicator that moves between exposed and non-exposed positions to indicate seal ring wear, along with a shroud that houses the compression springs to protect them from corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression springs are used to bias the piston against the seal ring, then the seal ring remains properly seated against the wear plate, but the installation process becomes time-consuming and difficult due to the need for accurate measurement of spring compression
Solution Approach 1:
The shroud is pre-assembled with the piston and compression springs in the correct configuration before installation. The shroud acts as a pre-assembled unit that ensures proper spring compression distance is maintained, eliminating the need for on-site measurement and adjustment during installation.
Solution Approach 2:
The shroud serves as an intermediary component between the end flange and the piston, physically maintaining the correct distance and compression force. By using the shroud as a mechanical intermediary, the complex measurement and adjustment process is replaced with a simple assembly operation.
2Loss of information
If the tab wear indicator engages the revolving wear plate to alert personnel, then seal ring wear is indicated, but the noise may be difficult to hear in loud papermill facilities and the tab may shear off causing damage
Solution Approach 1:
The acoustic notification system (tab engaging wear plate to create sound) is replaced with an optical notification system (alignment rings visible through aperture). This substitution eliminates the reliability issues of noise being inaudible in loud environments and the mechanical failure risk of tab shearing.
Solution Approach 2:
The wear indication system uses visual appearance changes (visibility of alignment rings) rather than mechanical contact. The alignment rings provide a clear visual signal that can be observed without auditory components, making the indication reliable in noisy industrial environments.
3Measurement precision
If operators measure distance from end flange to piston to determine seal ring wear, then wear can be assessed, but the process requires shutting down the entire paper manufacturing process and is time-consuming
Solution Approach 1:
The rotary joint system provides its own wear indication capability through the alignment rings and aperture mechanism. Operators can assess seal ring wear by simply observing whether alignment rings are visible through the aperture, without needing to shut down the process or perform complex measurements. The system serves itself by providing built-in diagnostic capability.
4Reliability
If compression springs are exposed to steam and condensate in the paper manufacturing process, then the springs can perform their function, but they become susceptible to rust and corrosion requiring regular replacement or cleaning
Solution Approach 1:
The compression springs are nested inside the shroud, which acts as a protective enclosure. The shroud contains the springs and isolates them from the corrosive environment (steam and condensate), while still allowing the springs to perform their mechanical function of biasing the piston against the seal ring.
Solution Approach 2:
The shroud, which is necessary for providing wear indication functionality, also serves a secondary protective function by shielding the compression springs from corrosion. The same structure that enables visual wear detection also protects the springs from harmful environmental factors.
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
Facilitates quick and accurate installation of rotary joints, provides a simple method to assess seal ring wear without shutting down the process, and reduces maintenance costs by protecting compression springs from corrosion.
Implementation Method 1
compression springs that are compressed between an end flange and the piston to bias the piston toward the seal ring
Data Source
AI summary
A rotary joint for connecting a stationary body to a rotating body. The rotary joint has a rotatable wear plate connectable to the rotating body and a seal ring seated in the wear plate. A spring-biased piston engages the seal ring against the wear plate by compressed springs between an end flange and the piston. The end flange and the piston are at least partially disposed within a shroud, wherein the shroud has at least one aperture extending there through. Alignment rings are formed on the piston and viewable through the aperture in the shroud to confirm the proper distance between the end flange and the piston and the proper force applied to the piston. A seal wear indicator is connected to the piston and moves between an exposed position, wherein the seal ring is not worn, and a non-exposed position, wherein the seal ring is worn.