Liquid Sealed Air Displacement Apparatus Preventing Seal Wear
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Solution Overview
Problem
Traditional fluid transfer devices experience air leakage due to wear of mechanical seals, leading to reduced accuracy and reliability over time.
Innovation Solution
A liquid sealed air displacement apparatus using a ceramic piston and cylinder with a tight clearance filled with sealing fluid, combined with a linear actuator and floating coupling, prevents air leakage by maintaining the sealing fluid between the piston and cylinder, and includes a compression spring to compensate for axial backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical seals (lip seals or o-rings) are used in traditional displacement pistons, then the device can operate with simple structure, but the seals wear over time causing air leakage and reducing accuracy
Solution Approach 1:
The patent replaces mechanical seals (lip seals or o-rings) with a liquid sealing system where a viscous fluid fills the clearance between the piston and cylinder, eliminating mechanical wear and providing permanent sealing without maintenance
Solution Approach 2:
The patent uses a liquid (viscous fluid) instead of mechanical components to create the sealing effect, where the fluid pressure and viscosity maintain the seal over millions of cycles without wear
2Reliability
If tight clearance is used between piston and cylinder to prevent air leakage, then sealing performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the sealing approach from dimensional control (tight clearance) to material property control (viscosity of sealing fluid), allowing standard manufacturing tolerances while achieving effective sealing through the fluid's resistance to flow
Solution Approach 2:
The viscous fluid acts as an intermediary between the piston and cylinder surfaces, filling the clearance and preventing air leakage without requiring extremely tight dimensional tolerances
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 apparatus achieves precise fluid transfer with millions of cycles without wear or leakage, maintaining high accuracy and reliability by effectively sealing the air displacement chamber.
Implementation Method 1
The clearance is configured with a dimension to maintain the sealing fluid between the piston and the cylinder. The sealing fluid is received in the clearance between the piston and the cylinder to substantially prevent air leakage into the displacement chamber.
Data Source
AI summary
A liquid sealed air displacement apparatus may be used in a fluid transfer device to transfer volumes of fluid. The air displacement apparatus may include a piston and a cylinder defining a displacement chamber for receiving the piston. The air displacement apparatus may be used to displace precise volumes of air into the air displacement chamber. Displacing the air creates a negative pressure in the air displacement chamber (i.e., suction), which may cause a precise volume of fluid to be drawn into the fluid transfer device. The piston and the cylinder may define a diametrical clearance for receiving sealing fluid, which may prevent air leakage and wear.