Lubricant Injector Piston Pressure Differential Metering
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Solution Overview
Problem
Existing lubricant injectors lack precision in delivering a predetermined quantity of lubricant due to reliance on mechanical springs or other devices for piston displacement, which can be inefficient and unreliable.
Innovation Solution
A lubricant injector design featuring a piston that is axially displaceable solely by differential lubricant pressures across its radial pressure surfaces, without the need for springs or additional devices, to accurately control the volume of lubricant delivered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical springs or additional devices are used for piston displacement, then the piston can be displaced, but the precision and reliability of delivering a predetermined quantity of lubricant deteriorates
Solution Approach 1:
The patent removes mechanical springs and additional displacement devices from the piston mechanism. The piston is displaced solely by pressure differentials created by the lubricant flow itself, extracting the problematic mechanical components while maintaining the essential function of piston displacement for metering lubricant delivery.
Solution Approach 2:
The lubricant pressure differential automatically displaces the piston without external mechanical assistance. The system uses its own operating fluid (lubricant) to drive the piston, creating a self-regulating metering mechanism that improves reliability and eliminates the need for separate displacement devices.
2Productivity
If mechanical springs are used for piston displacement, then the piston can be actuated, but the operational efficiency and responsiveness deteriorates
Solution Approach 1:
The patent replaces the mechanical spring-based displacement system with a fluid-pressure-based system. The piston is actuated directly by lubricant pressure differentials, eliminating mechanical intermediaries and improving responsiveness to pressure changes, which enhances operational efficiency and delivery speed.
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 design ensures precise and reliable delivery of a predetermined lubricant quantity by leveraging pressure differentials, enhancing responsiveness and reducing mechanical complexity, thereby improving operational efficiency.
Implementation Method 1
The piston is axially displaceable solely by a differential between a first force generated by lubricant pressure exerted on the first pressure surface and a second force generated by lubricant pressure exerted on the second pressure surface.
Data Source
AI summary
A lubricant injector includes a body having an inlet at a first end fluidly coupleable to a lubricant source, an outlet, a delivery chamber coupled with the outlet and a bore defined by a substantially circular inner surface with a constant inner diameter and spaced axially from the body inlet, the bore having a first port fluidly connected with the body inlet and a second port disposed between the body inlet and the first port and fluidly connected with the delivery chamber. A generally circular cylindrical piston is disposed within the bore so as to divide the bore into an operating chamber fluidly coupled with the first port and a measuring chamber fluidly coupled with the second port and located axially between the operating chamber and the body first end. The piston has an outer circumferential slidably disposed against the bore inner surface and having a generally constant outside diameter.