Wafer-Style Flow Meter Cam Alignment Mechanism
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Solution Overview
Problem
Wafer-style flow meters face misalignment issues due to the absence of bolt hole circles, leading to local turbulence and inaccurate readings, and existing alignment solutions with additional hardware are costly, time-consuming, and prone to ineffective installation.
Innovation Solution
A wafer-style process instrument with end plates featuring cams to engage threaded fasteners and a repositionable neck with rotatable segments for centering the flow passage, eliminating the need for additional hardware by utilizing existing pipe hardware for alignment and ensuring a leak-proof seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wafer-style flow meters remove flanges to reduce cost and simplify installation, then manufacturing cost and installation time are reduced, but misalignment issues occur leading to local turbulence and inaccurate readings
Solution Approach 1:
The patent introduces camming devices as intermediary elements between the wafer-style flow meter body and the pipe flanges. These cams engage with the fasteners to force them to extreme positions within the bolt holes, thereby ensuring proper alignment of the flow passage with the conduit. This intermediary mechanism resolves the alignment precision issue without requiring traditional flanges, maintaining the cost and installation simplicity benefits of wafer-style meters.
2Manufacturing precision
If camming devices are added to center wafer-style flow meters, then alignment precision is improved, but device complexity and installation time increase
Solution Approach 1:
The patent integrates the camming alignment devices directly into the wafer-style flow meter body, merging the alignment function with the meter housing. This integration eliminates the need for separate, removable camming sleeves or rings that would add to hardware complexity. The cams are fixed to the end plates of the meter body, reducing the number of discrete components while maintaining the alignment precision benefit.
3Manufacturing precision
If camming devices are used for alignment, then alignment precision is improved, but installation time and cost increase
Solution Approach 1:
The camming devices are pre-installed and fixed to the wafer-style flow meter body during manufacturing, rather than being installed separately on-site. This preliminary action ensures that the alignment mechanism is already in place and configured correctly before the meter is shipped to the installation location. During installation, the meter body with pre-installed cams is simply positioned between the flanges and secured with fasteners, eliminating the time-consuming step of installing separate camming devices and reducing installation complexity.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A process instrument having a wafer-style body for mounting between an upstream flanged pipe and a downstream flanged pipe has a flow passage, a transmitter connected to the body, and first and second end plates fixed to the body. The first end plate has a first set of cams for engaging a plurality of threaded fasteners extending between the upstream flanged pipe and the downstream flanged pipe. The second end plate has a second set of cams for engaging the plurality of threaded fasteners such that the first set of cams and the second set of cams center the flow passage with respect to the upstream flanged pipe and the downstream flanged pipe.