Fluid Controller Stem Adjustment Mechanism
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Solution Overview
Problem
Existing fluid controllers face issues with accuracy reduction due to screw loosening and durability reduction caused by torsional stress, particularly in the stem vertical-movement-amount adjustment mechanism.
Innovation Solution
The fluid controller incorporates a handle rotatably supported by the casing, a movable body screwed into the handle's inner periphery, and a guide means that prevents the movable body from rotating relative to the casing, converting rotational handle movement into vertical movement of the movable body to adjust the stem's vertical movement amount, thereby avoiding screw loosening and torsional stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle and casing are screwed together and rotated to adjust the stopper position, then the vertical movement amount of the stem can be adjusted, but the screw portion may loosen and torsional stress may be generated affecting component members
Solution Approach 1:
The adjustment mechanism is divided into separate functional components: the handle for rotation, the movable body for vertical movement, and the guide means for constraint. This segmentation allows the rotational input to be converted to linear output without transmitting torsional stress to the casing, resolving the contradiction between adjustability and reliability
Solution Approach 2:
The movable body acts as an intermediary between the handle and the stem. It converts the rotational motion of the handle into vertical movement through the guide means, preventing direct transmission of torsional stress to the stem and other component members while maintaining adjustment functionality
2Manufacturing precision
If the screw portion is rotated to adjust the stopper position, then the vertical movement amount can be changed, but accuracy is reduced due to screw loosening
Solution Approach 1:
The guide means extracts and prevents the harmful rotational movement of the movable body relative to the casing. By constraining the movable body to move only vertically, the system eliminates the loosening mechanism while preserving the adjustment accuracy through the screw-threaded connection between the handle and movable body
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 solution effectively prevents accuracy reduction and durability loss by converting rotational handle movement into vertical movement, eliminating the risks of screw loosening and torsional stress, ensuring stable operation and accurate flow rate adjustment.
Implementation Method 1
a movable body screwed into an inner periphery of the handle
Data Source
AI summary
Provided is a fluid controller in which reduction of the accuracy caused by the loosening of a screw portion and reduction of the durability caused by torsional stress are prevented. A stem vertical-movement-amount adjustment means 11 is provided with: a handle 41 which has a female screw 41b on an inner periphery thereof and which is rotatably supported by a casing 4; a movable body 42 in which a male screw 46b is provided on an outer periphery thereof and is screwed into the inner periphery of the handle 41; and a guide means 43 which prevents rotation of the movable body 42 relative to the casing 4 and which enables vertical movement of the movable body 42.