Piston-Impact Check Valve Priming for Dry Fluid Sprayer Pumps
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Solution Overview
Problem
Fluid sprayer pumps often require manual intervention to prime due to air entrapment and sticky residues causing check valves to remain closed, hindering the uptake of fluid.
Innovation Solution
A pump design where the downstream end of the piston is configured to impact and open the check valve, facilitating automatic priming by displacing air and overcoming surface tension or sticky residues, eliminating the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the check valve is designed to remain closed to prevent fluid leakage, then sealing reliability is improved, but the valve becomes stuck in the closed position due to surface tension of sticky residue, preventing proper priming
Solution Approach 1:
The piston is configured to automatically impact the check valve during the priming stroke before normal operation begins. This preliminary action opens the valve to allow air ejection, preventing the valve from becoming stuck due to surface tension of sticky residue that would otherwise prevent proper priming
2Ease of manufacture
If manual intervention is required to open the check valve during priming, then ease of manufacture is improved, but device complexity increases due to additional manual操作步骤
Solution Approach 1:
The piston automatically impacts the check valve during the priming stroke to open it and allow air ejection. This self-service mechanism eliminates the need for users to manually remove and manipulate the check valve, reducing operational complexity while maintaining simple valve structure
3Reliability
If air pressure is increased to overcome surface tension of sticky residue, then check valve opening reliability is improved, but air compression efficiency decreases due to insufficient pressure generation
Solution Approach 1:
The piston delivers a preliminary impact to the check valve during the priming stroke, providing the necessary force to overcome surface tension of sticky residue and open the valve. This impact action generates sufficient opening force without requiring sustained high air pressure, addressing the insufficiency of pressure generation
4Productivity
If the piston continuously impacts the check valve to keep it open, then priming speed is improved, but component wear increases
Solution Approach 1:
The piston impacts the check valve periodically during the priming stroke to open it when needed, rather than continuously. This periodic action achieves quick priming by opening the valve at the appropriate moment while minimizing unnecessary impacts, thereby reducing component wear and extending service life
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 enables quicker and more efficient priming of fluid sprayers by automatically opening stuck check valves, reducing user effort and simplifying the process, while minimizing wear on components.
Implementation Method 1
The downstream end of the first piston is configured to impact the first valve member to drive the first valve member from a closed position to an open position
Data Source
AI summary
A pump draws fluid from a reservoir and drives the fluid downstream to a spray tip where the fluid is applied to a surface. A piston is driven in a reciprocating manner to pump the fluid. A check valve is disposed downstream of the piston to regulate a flow of the fluid downstream from the piston. The pump is initially dry and is primed with fluid prior to operation. To facilitate priming, the piston is dimensioned to impact the ball and unseat a valve member of the check valve during a priming stroke, thereby ejecting any air from the pump through the check valve. With the air ejected from the pump, a vacuum is formed during a suction stroke of the piston, which draws fluid downstream from the reservoir to prime the pump.