Fluid Controller Diaphragm Holder Gap Design
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Solution Overview
Problem
The existing fluid controller requires additional components and processes for setting means, leading to increased costs and susceptibility to erroneous set value changes due to operator errors or external interference.
Innovation Solution
A fluid controller design where the upward and downward movable amounts of the stem are set using a diaphragm holder and holder adapter with predetermined gaps, eliminating the need for additional machining or components like handles or stoppers, and ensuring the diaphragm holder and adapter are stored within the controller to prevent erroneous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional components and processes are added for setting means, then the adjustable range and precision of stem movement can be improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the setting function directly into the existing diaphragm holder and holder adapter components that are already necessary for diaphragm support. The diaphragm holder's upper surface and the holder adapter's lower surface work together to define the stem's upward movement limit, eliminating the need for separate setting mechanisms like stoppers or adjustable links.
Solution Approach 2:
The diaphragm holder serves multiple functions: it supports the diaphragm, provides structural connection between the stem and holder adapter, and simultaneously acts as the setting element that limits stem movement through its upper surface position relative to the holder adapter. This multi-functionality reduces the need for additional dedicated setting components.
2Adaptability or versatility
If the handle and stopper are used for setting means, then the stem movement can be adjusted, but the set value may change due to erroneous operation or external interference
Solution Approach 1:
The patent segments the setting function into the fixed geometric relationship between the diaphragm holder and holder adapter components. The upward movement limit is determined by the predetermined position of the diaphragm holder's upper surface relative to the holder adapter's lower surface, creating a stable, non-adjustable setting that cannot be changed by external operation or interference.
Solution Approach 2:
The stem movement limit is predetermined during the design and assembly phase through the fixed positioning of the diaphragm holder relative to the holder adapter. This preliminary setting eliminates the need for field adjustment mechanisms like handles or stoppers, ensuring the set value remains stable and cannot be accidentally changed during operation.
3Ease of manufacture
If a radial gap is provided between diaphragm holder and holder adapter, then assembly is easier, but the upward movable amount of stem cannot be precisely controlled
Solution Approach 1:
The patent applies different gap requirements to different locations: a radial gap is provided between the outer peripheral edge of the diaphragm holder and the holder adapter for easy assembly, while the upper surface of the diaphragm holder and lower surface of the holder adapter are positioned with precise vertical spacing to control the stem's upward movement. This localized differentiation of gap functions achieves both assembly ease and precise movement control.
Data Source
AI summary
A fluid controller that reduces an increase in cost by additional components or additional processes for setting means, and solves the problem that a set value of an upward movable amount of a stem changes is provided. An upper surface of an outer peripheral edge portion of a diaphragm holder 7 and a lower surface of an inner peripheral edge portion of a holder adapter 15 are formed so as to oppose to each other with a first gap A interposed therebetween. By setting the first gap A to a predetermined value, an upward movable amount of the diaphragm holder 7 is set.