Orifice Holding Member for Flow Measuring Device
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Solution Overview
Problem
Existing flow measuring devices with a bypass flow channel structure face challenges in maintaining measurement accuracy due to positional displacement of the orifice and collar components, leading to variations in the flow ratio, which affects the measurement of large flow amounts.
Innovation Solution
A flow measuring device design that incorporates an orifice holding member with a depressed holding member containing portion, allowing for precise positioning and secure fixation of the orifice within the main flow channel, reducing variations in the flow ratio and ensuring smooth gas flow by avoiding overlap with branch entrances and exits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the orifice is integrally formed with the main flow tube to reduce the number of component parts and production tolerance, then the manufacturing complexity is reduced, but the adaptability to change orifice specifications is lost
Solution Approach 1:
The orifice is separated from the main flow tube into an independent replaceable component. This segmentation allows the orifice to be changed independently without redesigning the entire flow tube, resolving the contradiction by maintaining low assembly complexity while enabling easy adaptation to different orifice specifications.
Solution Approach 2:
The orifice is designed as a dynamic, replaceable element rather than a fixed integral part. This allows the system to adapt to different measurement requirements by swapping orifices with different opening sizes, maintaining versatility while keeping the overall device structure simple through standardized mounting interfaces.
2Adaptability or versatility
If the orifice is made replaceable by forming it separately from the main flow tube, then the adaptability to change orifice specifications is improved, but the manufacturing complexity and assembly steps increase
Solution Approach 1:
The orifice is segmented as a separate component that can be independently manufactured and replaced. This segmentation enables adaptability to different orifice specifications while the standardized interface design minimizes the increase in overall device complexity.
Solution Approach 2:
The main flow tube is designed with a universal mounting structure that can accommodate different orifice types and sizes. This universality allows the same flow tube to work with multiple orifice configurations, reducing the need for multiple specialized components and minimizing the actual increase in device complexity.
3Ease of manufacture
If adhesive agent is used to fix the orifice to the main flow channel wall, then the positioning is simplified, but the measurement accuracy decreases due to adhesive protrusion and wall surface adhesion
Solution Approach 1:
The adhesive agent is extracted from the fixation process entirely. Instead of using adhesive, the orifice is mechanically fixed using a dedicated holding member with a containing portion that physically secures the orifice in position, eliminating the harmful effects of adhesive protrusion and wall surface adhesion on measurement accuracy.
Solution Approach 2:
An orifice holding member is introduced as an intermediary component between the orifice and the main flow channel. This holding member provides a precise mechanical fixation structure that positions the orifice accurately without requiring adhesive, thereby maintaining measurement precision while simplifying the fixation process.
4Manufacturing precision
If the collar is baffled by inserting a supporting pin deep into the main flow channel, then the positioning is achieved, but the assembly difficulty increases
Solution Approach 1:
Instead of inserting a pin deep into the flow channel to position the collar, the design inverts the approach by providing fitting holes in the collar itself and using stopper sections within the flow channel that engage with these holes. This reversal simplifies assembly by eliminating the need for deep pin insertion while maintaining positioning accuracy.
Solution Approach 2:
The positioning mechanism uses standardized fitting holes and stopper sections that can be replicated easily in manufacturing. This copying approach allows for precise positioning through simple, repeatable assembly steps rather than complex deep-insertion procedures, reducing assembly difficulty while maintaining manufacturing precision.
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
This design stabilizes the flow ratio, enhancing measurement accuracy and enabling the production of flow measuring devices for various flow amount ranges with reduced component variations and manufacturing costs.
Implementation Method 1
Due to a differential pressure produced in the vicinity of the orifice 25, a part of the gaseous body that flows through the main flow channel 13 is directed to the auxiliary flow channel 14
Data Source
AI summary
A flow measuring device has a flow channel block including a main flow channel whose both ends are open, and an auxiliary flow channel that branches from the main flow channel, a flow amount measurement element provided for the auxiliary flow channel, and a branch entrance and a collection exit that open in a wall surface of the main flow channel, and that communicate to the auxiliary flow channel, so that a part of a gaseous body that flows through the main flow channel is directed to the auxiliary flow channel through the branch entrance, and the gaseous body that has passed through the auxiliary flow channel is directed back to the main flow channel through the collection exit. A holding member containing portion is provided in a depressed manner for an area excluding an area including the branch entrance and an area including the collection exit in a circumference surface of a space of the flow channel block that configures the main flow channel. An orifice is contained within the main flow channel. An orifice holding member fitted into the holding member containing portion holds the orifice by being brought into contact with the orifice. The wall surface of the main flow channel is configured by a wall surface excluding the area for which the holding member containing portion is formed out of the main flow channel and an inner surface of the orifice holding member.