Explosion-Proof Solenoid Valve Structure With Minimized Magnetic Gap
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Solution Overview
Problem
Current solenoid valves lack an explosion-proof certification for use in hazardous environments, such as Zone 0, which is required for large-capacity ship engines, due to technical difficulties in developing a certified gas feeding valve with a solenoid that meets international safety standards.
Innovation Solution
A solenoid valve design incorporating a body with a channel, a housing, a solenoid assembly, an armature, and a cover plate, where the solenoid assembly includes a core and coil, and the cover plate is inserted into a mounting portion to minimize the gap between the solenoid assembly and armature, enhancing the magnetic force and implementing a pressure-resistant explosion-proof structure without additional explosion-proof members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solenoid valve is designed for high gas flow rate performance, then the valve opening area and flow capacity are improved, but the safety and explosion-proof certification capability deteriorates
Solution Approach 1:
The solenoid valve is divided into separate functional modules: a solenoid assembly housed in a dedicated housing, an armature assembly with explosion-proof structure, and a body with flow control elements. This segmentation allows independent optimization of flow performance and safety features, enabling the valve to achieve both high gas flow rate and explosion-proof certification capability simultaneously
Solution Approach 2:
A non-flammable liquid (such as water or glycol) is introduced as an intermediary substance between the solenoid assembly and the gas flow path. This liquid acts as a flame arrestor and thermal barrier, preventing potential ignition of gas while maintaining efficient flow control, thus resolving the contradiction between productivity and safety
2Force
If the gap between solenoid assembly and armature is reduced to increase magnetic force, then the actuation force and response speed are improved, but the manufacturing precision and assembly difficulty worsen
Solution Approach 1:
The armature is designed with a resilient element (such as a spring or elastic component) that automatically maintains the optimal gap between the solenoid assembly and armature. This self-adjusting mechanism compensates for manufacturing tolerances and wear, ensuring consistent magnetic force without requiring ultra-precise manufacturing, thus resolving the contradiction between force generation and manufacturing precision
Solution Approach 2:
The magnetic circuit parameters are optimized by selecting high-permeability magnetic materials and designing flux path geometry that maximizes magnetic force at larger gaps. This allows the valve to achieve sufficient actuation force with increased gap dimensions, reducing manufacturing precision requirements while maintaining performance
3Reliability
If additional explosion-proof members are added to ensure safety certification, then the explosion-proof capability is improved, but the device complexity and size increase
Solution Approach 1:
The armature assembly serves multiple functions: it acts as both the actuating component for valve control and as an integral part of the explosion-proof structure. The housing design simultaneously provides mechanical protection, thermal insulation, and flame arrestment capabilities. This multi-functionality eliminates the need for separate explosion-proof members, reducing device complexity while maintaining certification capability
Solution Approach 2:
The potential harmful effect of electrical sparks or heat generation in the solenoid is converted into a beneficial safety feature by designing the housing with flame arrestor elements and thermal barriers. These elements normally add complexity but actually simplify the overall design by eliminating the need for additional safety systems, as the inherent operational characteristics are leveraged for safety
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 design ensures excellent performance and safety by minimizing the gap between the solenoid assembly and armature, increasing the magnetic force, and providing a smooth operation while achieving explosion-proof capabilities, allowing the solenoid valve to be used in hazardous environments without violating safety regulations.
Implementation Method 1
A solenoid valve generates a magnetic field by flow of an electric current through a coil wound in a cylindrical form, and thus, a fluid flow is controlled by the magnetic field moving a mover
Implementation Method 2
the cover plate is inserted into a mounting portion to minimize the gap between the solenoid assembly and armature, enhancing the magnetic force
Data Source
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AI summary
A solenoid valve having an explosion-proof structure, a fuel feeding system, and a method of manufacturing the solenoid valve having an explosion-proof structure are provided. The solenoid valve having an explosion-proof structure includes: a body including a channel through which a fluid flows; a housing connected to the body and having one surface opened; a solenoid assembly arranged inside the housing and electrically connected to a controller; an armature, at least a portion of which is arranged in the channel and which opens or closes the channel by moving relative to the solenoid assembly by a magnetic field generated by the solenoid assembly; and a cover plate arranged on the one surface of the housing to face the armature.