Handheld Airless Sprayer Buffer Valve for Consistent Low-Frequency Spray
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Solution Overview
Problem
The spray effect of handheld airless sprayers is adversely affected by piston movement frequency, leading to inconsistent spraying at low frequencies.
Innovation Solution
A handheld airless sprayer design featuring a buffer chamber in the liquid outlet valve, pre-pressurizing liquid before spraying, with a valve mechanism that opens when pressure exceeds a preset threshold, and a pressure relief system to manage excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If piston movement frequency is reduced, then energy consumption decreases, but spray consistency deteriorates
Solution Approach 1:
The buffer chamber pre-pressurizes liquid before it reaches the nozzle, so that even when piston movement frequency is low, the liquid is already pressurized and ready for consistent spraying. This preliminary pressurization action resolves the contradiction by maintaining spray consistency without requiring high-frequency piston movement.
Solution Approach 2:
The buffer chamber acts as an intermediary between the piston pump and the nozzle, decoupling the piston movement frequency from the spray output frequency. This intermediary allows the system to maintain consistent spray output even when the piston moves at lower frequencies, thereby reducing energy consumption while preserving spray consistency.
2Reliability
If piston movement frequency is increased, then spray consistency improves, but energy consumption increases
Solution Approach 1:
By pre-pressurizing liquid in the buffer chamber before it reaches the nozzle, the system achieves consistent spray output without needing high-frequency piston movement. This eliminates the need to increase piston frequency for better spray consistency, thereby avoiding increased energy consumption.
Solution Approach 2:
The buffer chamber serves as a mediator that decouples the relationship between piston frequency and spray consistency. It allows the system to achieve high spray consistency at lower piston frequencies, thus reducing energy consumption while maintaining reliable spray performance.
3Reliability
If buffer chamber volume is increased, then spray consistency improves, but device size increases
Solution Approach 1:
The buffer chamber is integrated into the liquid outlet valve body, merging two functions (valve mechanism and buffer storage) into a single component. This integration achieves spray consistency through buffering while avoiding the need for a separate, large buffer tank, thus maintaining a compact device size.
Solution Approach 2:
The buffer chamber is nested within the valve body structure, with the valve mechanism and spring assembly positioned inside or around the buffer chamber. This nesting arrangement maximizes the buffer volume within the available space, achieving good spray consistency without increasing overall device size.
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
Ensures consistent spray quality by maintaining uniform liquid pressure during spraying, reduces material costs, facilitates easy cleaning and assembly, and prevents overheating by managing pressure effectively.
Implementation Method 1
a spring (240), the spring (240) acting on the valve head (230) to bias the valve head (230) towards a direction of closing the liquid outlet hole (224)
Implementation Method 2
the actuation mechanism (130) activates the pump body (140) to draw liquid from the liquid cup (110) into the buffer chamber (211); the valve head (230) is opened when a liquid pressure in the buffer chamber (211) exceeds a preset liquid outlet pressure
Data Source
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AI summary
Disclosed is a handheld airless sprayer, which solves a problem of existing handheld airless sprayers that a spray effect is affected by piston movement frequency. The handheld airless sprayer as provided includes a casing, a liquid cup, a nozzle, a pump body, an actuation mechanism, and a liquid outlet valve, the nozzle being disposed at a front end of the casing, the pump body including a pump chamber, a liquid inlet end of the pump chamber being connected to the liquid cup, a liquid outlet end of the pump chamber being connected to the liquid outlet valve via a second check valve; the liquid outlet valve includes a valve body provided with a buffer chamber, and a valve seat, a valve head, and a spring provided in the valve body; a liquid outlet hole communicating with the nozzle is provided on the valve seat; the spring acts on the valve body to close the liquid outlet hole; the pump body draws liquid from the liquid cup into the buffer chamber; and the valve head is opened when a liquid pressure in the buffer chamber exceeds a preset liquid outlet pressure, whereby the liquid in the buffer chamber flows through the liquid outlet hole to be sprayed out of the nozzle.