Negative-Pressure Soft Bag Sprayer Layout for Stable Paint Delivery
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Solution Overview
Problem
Existing handheld high-pressure sprayers face issues with paint distribution, including difficulty in smoothly pumping paint, blockage, unstable spraying, and environmental pollution, and the center of gravity near the front leading to operator fatigue and unstable spraying direction.
Innovation Solution
A handheld electric sprayer with a negative-pressure soft liquid bag, featuring a sprayer body with a motor and plunger pump assembly, a transmission mechanism, a slider limited by limiting parts, and a detachable storage device on the upper portion, along with a pressure relief device and cleaning mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the storage device is arranged on the lower portion of the sprayer body, then the structure is compact, but paint cannot be added conveniently and is likely to overflow from the storage tank
Solution Approach 1:
The storage device is designed as a detachable component that can be separated from the sprayer body. This allows the storage tank to be removed for convenient paint refilling without affecting the compact integration of other sprayer components during operation.
Solution Approach 2:
The storage device transitions from a fixed position to a detachable configuration, enabling dynamic adjustment between compact operational mode and convenient refilling mode. This resolves the contradiction by allowing the system to adapt its structure based on operational needs.
2Device complexity
If the storage device and plunger pump assembly are arranged on the same side, then the structure is simplified, but the center of gravity is near the front causing operator fatigue and unstable spraying direction
Solution Approach 1:
The storage device and plunger pump assembly are positioned asymmetrically on opposite sides of the sprayer body rather than on the same side. This asymmetric arrangement balances the center of gravity, reducing operator fatigue and improving spraying stability while maintaining structural simplicity.
3Device complexity
If the transmission part is limited only by the eccentric cam and piston shaft, then the structure is simple, but a large gap is formed causing shaking and abrasion leading to pump damage
Solution Approach 1:
Limiting parts are pre-installed on the sprayer body to define the movement space of the transmission part before operation begins. This preliminary structural constraint prevents excessive gaps and shaking during operation, reducing abrasion and extending the service life of the pump without significantly complicating the transmission structure.
4Device complexity
If the paint storage device is directly connected with the multi-way connector, then the structure is simple, but paint is easily left in the pump causing blockage after long-term use
Solution Approach 1:
The storage device is extracted from direct permanent connection with the multi-way connector and made detachable. This allows the storage device to be removed after use, enabling complete drainage of paint from the pump and connection pathways, preventing blockage while maintaining simple connection structure during operation.
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
Facilitates stable operation, easy loading and cleaning, balanced center of gravity, and reliable spraying direction, reducing wear and tear, and efficient cleaning.
Implementation Method 1
a handheld electric sprayer with a negative-pressure soft liquid bag
Data Source
AI summary
A handheld electric sprayer with a negative-pressure soft liquid bag includes a sprayer body, wherein a motor and a plunger pump assembly are arranged in the sprayer body, a transmission mechanism rotatably connected with the motor is arranged in the sprayer body, a slider is arranged between the transmission mechanism and the plunger pump assembly, and limiting parts are arranged between the slider and the sprayer body; the plunger pump assembly includes a piston rod, and when the motor drives the transmission mechanism to rotate, the slider drives the piston rod to stretch and retreat; a storage device detachably is arranged on an outer side of the sprayer body, and the storage device is connected with the plunger pump assembly; and a pressure relief device is arranged on the plunger pump assembly, and a return passage is arranged between the pressure relief device and the storage device.