Solenoid Switch for Aerosol Spraying Device
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Solution Overview
Problem
Existing spraying devices require significant force to activate the aerosol container, leading to potential damage due to slight lateral movements, resulting in malfunction and breakage of the aerosol container stem.
Innovation Solution
A solenoid switch with a conical spring bias and a bobbin element that incorporates a magnetic circuit, providing precise control and minimizing air gaps, along with a seal system to prevent fluid leakage and ensure reliable operation under high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a moveable arm is used to depress the outlet valve, then the spraying device can be controlled by a timer and motor, but a relatively large amount of force is required which may cause damage to the aerosol container stem due to slight lateral movements
Solution Approach 1:
The patent replaces the mechanical moveable arm system with a solenoid valve actuated by an electromagnetic field. The solenoid coil generates a magnetic field that directly actuates the valve without requiring a mechanical arm, thereby eliminating the harmful lateral forces and contact stresses that caused stem damage while maintaining automated timer-controlled operation.
2Ease of manufacture
If tolerances are not tightly controlled in the moveable arm system, then manufacturing is easier, but slight lateral movement of the output stem results in damage to the aerosol container
Solution Approach 1:
The electromagnetic solenoid system eliminates the need for tight mechanical tolerances in a moveable arm mechanism. The solenoid's magnetic field provides precise, controlled actuation of the valve without the lateral movements and mechanical contact that caused reliability issues, allowing easier manufacturing while maintaining high reliability.
3Measurement precision
If a solenoid switch is used to control fluid discharge, then precise control and compact design are achieved, but the solenoid must operate reliably under high pressures
Solution Approach 1:
The patent employs a conical spring with a tapered geometry that provides progressive biasing force against the armature. This conical configuration ensures uniform contact and force distribution across the armature surface, enabling the solenoid to maintain reliable operation under high pressure while achieving precise fluid discharge control through controlled armature movement.
Solution Approach 2:
The solenoid design incorporates a conical spring that changes its mechanical parameters (force, compression) based on operating conditions. The spring's conical geometry allows it to provide appropriate biasing force across a range of pressures, enabling the solenoid to maintain reliable operation from low to high pressure conditions while preserving precise control capability.
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 solenoid switch enables precise control of fluid discharge with reduced force requirements, minimizing the risk of damage to the aerosol container and ensuring reliable operation across a range of pressures, while maintaining a compact design.
Implementation Method 1
a solenoid switch having a bobbin element on or around which a magnetic circuit of the solenoid is located
Implementation Method 2
The solenoid switch may incorporate a resilient bias, which may be a coiled spring, preferably a spring that is conical in shape
Data Source
Figure 1
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AI summary
A spraying device for spraying fragrance, pest control composition and/or a sanitising composition held within a pressurised container, the spraying device comprising a container receiving section (13) and a switching section (10) wherein the switching section (10) incorporates a solenoid switch.