Variable-Pressure Air Pump With Dynamic Cylinder Area
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Solution Overview
Problem
Existing air pumps face a trade-off between inflation efficiency and pressure, making it difficult to improve both simultaneously, and users struggle to conveniently operate the pump when connected to a tire due to ergonomic design limitations.
Innovation Solution
A variable-pressure air pump design featuring two interconnected cylinders, a plunger with one-way flow passages, and a discharge device with a switch that controls air flow, allowing for adjustable pressure and improved ergonomics through a shell assembly for easier handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross-sectional area of cylinders is increased to improve inflation rate, then the inflation efficiency is improved, but the pressure output decreases
Solution Approach 1:
The patent applies a variable cross-sectional area design where the cylinder area changes during the pumping stroke. The cylinder has a larger cross-sectional area at the beginning of the stroke to provide high inflation rate, and a smaller cross-sectional area toward the end to maintain high pressure output. This dynamic area adjustment resolves the contradiction between inflation rate and pressure output.
2Productivity
If the pump is directly connected to a valve of a tire to be inflated, then the inflation function is achieved, but the user is unable to hold the head conveniently and operate the pump smoothly
Solution Approach 1:
The patent introduces a shell assembly as an intermediary component between the user's hand and the pump head. The shell assembly provides an ergonomic gripping surface and proper hand positioning, making the pump easy to hold and operate smoothly while maintaining the direct connection functionality for inflation.
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 enhances inflation efficiency and pressure control while allowing for convenient operation by enabling adjustable discharge and improved user handling, addressing the ergonomic limitations of prior air pumps.
Implementation Method 1
A plunger has a first end inserted in the first chamber and a second end inserted in the second chamber. The plunger defines a one-way flow passage fluidly connecting with the first and the second chambers.
Implementation Method 2
A piston device is configured to compress air in the first and the second chambers.
Implementation Method 3
The switch has at least one flow guide portion fluidly connecting with the outside of the variable-pressure air pump and at least one blocking portion which is adapted to block the at least one discharge hole.
Data Source
AI summary
A variable-pressure air pump includes a first cylinder with a first chamber and a second cylinder with a second chamber movably connected with one another. The second chamber fluidly communicable with the outside of the variable-pressure air pump selectively. A discharge device includes a connecting member and a switch movably connected with one another. The connecting member defines at least one discharge hole fluidly connecting with the second chamber. The switch has at least one flow guide portion and at least one blocking portion. The switch is movable between a first position in which the at least one flow guide portion is adjacent and opens to the at least one discharge hole and a second position in which the at least one blocking portion is adjacent to and blocks the at least one discharge hole.