Liquid Control Valve Linkage for Stable Travel and Sealing
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Solution Overview
Problem
Conventional liquid control valves experience issues with sealing effectiveness due to changes in liquid level, leading to either incomplete disengagement or continuous leakage, caused by adjustments in the distance between pivotal points affecting the travel and sealing contact of the valve rod and seal ring.
Innovation Solution
A liquid control valve design featuring a base with intercommunicating chambers, an adjusting rod with a conical connection mechanism, and a liquid stopper with multiple sealing contacts between the seal and guiding member, ensuring consistent travel and enhanced sealing without deformation, even with changes in liquid level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the distance between the first pivotal point and the second pivotal point is adjusted to change the liquid level, then the liquid storage amount is increased or reduced, but the travel of the valve rod and seal ring is changed, causing incomplete disengagement or continuous leakage
Solution Approach 1:
The linkage mechanism is divided into multiple segments: float rod, pull rod, and valve rod as separate but connected components. This segmentation allows each component to have its own optimized travel distance while working together as a system, enabling the seal ring to achieve complete disengagement or proper sealing contact regardless of the overall liquid level adjustment.
Solution Approach 2:
The patent introduces a vertical dimension to the linkage mechanism by arranging the float rod, pull rod, and valve rod in a vertical sequence. This vertical arrangement allows the system to accommodate varying liquid levels while maintaining consistent sealing performance through the cumulative effect of each segment's travel in the vertical direction.
2Reliability
If the protrusion presses against the valve rod bottom for a long period to maintain sealing, then the seal ring deforms due to long-term pressure, but without continuous pressing the sealing contact is lost
Solution Approach 1:
The patent employs a dynamic linkage mechanism where the float rod, pull rod, and valve rod move together in response to liquid level changes. This dynamic system allows the seal ring to maintain sealing contact only when needed (when liquid level requires it) rather than continuous pressing, preventing deformation while ensuring reliability.
Solution Approach 2:
The float mechanism provides automatic feedback control: when the liquid level drops, the float rod moves downward, pulling the pull rod and valve rod to disengage the seal ring for liquid supply. When the liquid level reaches the desired height, the float rod moves upward, pushing the pull rod and valve rod to re-establish sealing contact, automatically adjusting without manual intervention.
3Reliability
If the seal ring contact area with the flange is increased to improve sealing, then the device complexity increases, but with small contact area the sealing effectiveness is insufficient
Solution Approach 1:
The patent extracts the sealing function from the flange-seal ring interface and relocates it to the valve rod bottom-protrusion interface. This extraction allows the seal ring to maintain a simple structure with limited contact areas while achieving effective sealing through the dedicated sealing point at the valve rod bottom, reducing overall device complexity.
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
The design maintains consistent travel of the liquid stopper and achieves superior sealing effectiveness by preventing leakage through multiple sealing contacts, ensuring reliable liquid control and storage.
Implementation Method 1
a float 951 floating on the liquid level
Data Source
AI summary
A liquid control valve includes a base, a liquid stopper, an adjusting rod, and a linkage. The base includes a first chamber and a second chamber intercommunicating with each other. The base further includes an inner face having an upper stop portion. The liquid stopper includes a valve body movably received in the first chamber and a seal for abutting against the upper stop portion. The adjusting rod includes a fixing arm and an adjusting arm, which are connected to each other by a conical hole and a cone. An end of the fixing arm is pivotably connected to a first pivotal portion of the base. The linkage includes a driving arm and a connecting arm which are pivotably connected. An end of the driving arm is pivotably connected to a second pivotal portion of the base. An end of the connecting arm is pivotably connected to the fixing arm.