Stem-less Valve Pressure Threshold for Portable Airless Sprayers
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Solution Overview
Problem
Traditional compact airless paint sprayers suffer from low performance, resulting in less-than-professional finishes due to low pressures generated by smaller electric motors and inferior spray nozzles.
Innovation Solution
A portable airless paint sprayer featuring a stem-less valve with a cylindrical valve body, a movable plug, a spring, and a spray orifice, which allows fluid to flow only when the pressure reaches a specific threshold, enabling professional-grade finishes with a smaller electric motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a smaller electric motor is used in compact paint sprayers, then the device becomes more portable and easier to handle, but the spray pressure is insufficient to produce professional-grade finishes
Solution Approach 1:
A pressure accumulation chamber is introduced as an intermediary component between the pump and spray nozzle. This chamber accumulates fluid under pressure and releases it in controlled bursts, enabling the small motor to generate sufficient spray pressure (800-2000 PSI) for professional finishes while maintaining portability.
Solution Approach 2:
The system changes the temporal parameters of fluid delivery by accumulating pressure over time in a chamber and then releasing it rapidly. This allows the motor to operate at lower average power while still achieving the high peak pressures needed for professional-grade spray application.
2Device complexity
If a stem-less valve design is used, then the valve structure becomes simpler and more reliable, but the mechanism for controlling fluid flow at high pressure becomes more complex
Solution Approach 1:
The stem-less valve uses a floating disc that automatically opens and closes based on pressure differential. The fluid pressure itself serves to open the valve when sufficient pressure is reached, and the spring force automatically closes it when pressure drops, eliminating the need for external actuation mechanisms and improving reliability.
Solution Approach 2:
The valve utilizes hydraulic principles where fluid pressure directly acts on the floating disc to overcome spring force and open the flow path. This pressure-actuated mechanism provides reliable flow control without mechanical stems or external actuators.
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 solution achieves professional-grade paint finishes with a compact, handheld design, capable of pressures between 800 PSI and 2000 PSI, overcoming the limitations of traditional compact sprayers.
Implementation Method 1
a spring disposed within the air cavity. The spring is positioned between the sealed end of the cylindrical valve body and the movable plug. The spring biases the movable plug against the seat to prevent the fluid from flowing through the fluid conduit to the spray orifice when a fluid pressure is below a spray pressure threshold
Implementation Method 2
The spring compresses when the fluid pressure reaches or exceeds the spray pressure threshold, at least partially retracting the movable plug away from the seat, and allowing the fluid to flow through the fluid conduit to the spray orifice
Implementation Method 3
the air cavity when compressed by the movable plug is operable to function as a damper to the spring to reduce vibration of the spring resulting from an operation of the pump or a motor operably connected to the pump
Data Source
AI summary
An airless fluid dispensing apparatus, a stem-less spray valve, and a pressure relief valve are disclosed. The stem-less spray valve comprises a generally cylindrical valve body; a fluid conduit, operable to allow a flow of the fluid from a pump, at least partially through the valve body, to a spray orifice; a movable plug disposed at least partially within the valve body; a seat, shaped to conform to a shape of the movable plug; a spring disposed within the valve body. The spring biases the movable plug against the seat to prevent the fluid from flowing through the fluid conduit to the spray orifice when a fluid pressure is below a spray pressure threshold. When the fluid pressure reaches or exceeds the spray pressure threshold, the spring compresses, at least partially retracting the movable plug away from the seat, and allowing the fluid to flow through the fluid conduit to the spray orifice.