Float Switch Link Mechanism Sticking Prevention
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Solution Overview
Problem
Conventional float switches have a complex link mechanism that tends to get stuck, leading to malfunctions due to their structure.
Innovation Solution
A float switch design featuring a junction box, a switch, a guide rod, a float, a link mechanism, and a seal assembly with a sealing member, cylindrical pin, connecting rod, support, and shift fork, which includes a well-sealed configuration using a washer, press cover, O-ring, and lip seal to ensure smooth rotation and prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional link mechanism is used in the float switch, then the switch can detect liquid level, but the complex structure causes the mechanism to get stuck and malfunction
Solution Approach 1:
The link mechanism is divided into separate functional components: a float that moves vertically, a connecting rod that transmits motion, and a switch mechanism that detects the level. This segmentation simplifies each component's structure and reduces the overall complexity while maintaining reliability through modular design.
Solution Approach 2:
The patent extracts and eliminates unnecessary intermediate components from the conventional link mechanism. By directly connecting the float to the switch through a simplified rod structure, it removes redundant joints and connection points that were causing sticking and malfunctions, thereby improving reliability without complex mechanisms.
2Reliability
If the link mechanism structure is simplified, then sticking is reduced, but sealing performance may be compromised
Solution Approach 1:
The patent introduces sealing elements as intermediary components between the simplified link mechanism parts. These sealing elements mediate between the moving components and the housing, ensuring that the simplified structure maintains effective sealing without requiring complex sealing mechanisms.
Solution Approach 2:
The patent employs flexible sealing rings and thin film seals that can accommodate the simplified link mechanism's motion while maintaining sealing integrity. These flexible sealing elements adapt to the simplified structure's movements, preventing leakage without requiring the original complex sealing arrangement.
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 provides flexible and smooth rotation of the link mechanism, reducing the likelihood of sticking and enhancing the float switch's sealing and service life.
Implementation Method 1
The link mechanism is supported by the support and is driven by buoyancy of the float to open or close the switch
Data Source
AI summary
A float switch, including a junction box, a switch, a guide rod, a float, a link mechanism, and a seal assembly. The switch is disposed in the junction box. The junction box is tightly coupled to the link mechanism. The float is flexibly disposed on the guide rod. The link mechanism includes a sealing member, a cylindrical pin, a connecting rod, a support, and a shift fork; one end of the link mechanism is connected to the switch via the shift fork, and the other end of the link mechanism is connected to the guide rod. The support includes a first through hole and a second through hole which are perpendicular to one another. The connecting rod includes a through hole corresponding to the second through hole of the support. The connecting rod runs through the first through hole of the support.