Solenoid valve with explosion-proof structure, fuel feeding system, and method of manufacturing the solenoid valve with explosion-proof structure

A fuel feeding system comprising an engine, a fuel feeding manifold configured to feed fuel to the engine, an air supply manifold configured to supply air to the engine, a solenoid valve configured to open or close a space between the fuel feeding manifold and the air supply manifold, and a controller configured to control the solenoid valve, wherein the solenoid valve comprises:

• a body comprising 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 the controller;
• an armature of which at least a portion is arranged in the channel, and which is configured to open or close 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,
• wherein the solenoid assembly comprises a coil and a core,
• wherein the coil is wound around an insulator and inserted into the core, and
• wherein the cover plate is arranged to cover the coil and to expose the core, and
• wherein the cover plate is arranged on a same plane as a bottom surface of the core such that the bottom surface of the core and the armature are kept on a non-contact state.

A method of manufacturing a solenoid valve, the method comprising:

• fixing a solenoid assembly comprising a core and a coil in a housing;
• fixing a cover plate in the housing;
• mounting the cover plate on the solenoid assembly;
• welding the housing, the solenoid assembly, and the cover plate;
• and
• grinding a surface of the cover plate,
• wherein the coil is wound around an insulator and inserted into the core,
• wherein the cover plate is arranged to cover the coil and to expose the core, and
• wherein the cover plate is arranged on a same plane as a bottom surface of the core such that the bottom surface of the core and an armature are kept in non-contact state, the armature configured to open or close a channel by moving relative to the solenoid assembly by a magnetic field generated by the solenoid assembly.

A solenoid valve comprising:

• a solenoid assembly configured to be arranged inside a housing comprising a channel for flowing a fluid;
• an armature configured to open or close the channel by moving relative to the solenoid assembly;
• and
• a cover plate combined with the solenoid assembly and facing the armature with a predetermined gap,
• wherein a bottom surface of the solenoid assembly facing the armature is coplanar a bottom surface of with the cover plate facing the armature,
• wherein the solenoid assembly comprises a coil and a core,
• wherein the coil is wound around an insulator and inserted into the core,
• wherein the cover plate is arranged to cover the coil and to expose the core, and
• wherein the cover plate is arranged on a same plane as a bottom surface of the core such that the bottom surface of the core and the armature are kept in non-contact state.