Electromagnetic vibrating diaphragm pump with function preventing fluid leakage to electromagnetic portion

An electromagnetic vibrating diaphragm pump comprising:

• a casing containing a pair of opposing electromagnet coils to which an alternating-current power source is connected and an oscillator arranged movably in reciprocation between the pair of electromagnet coils;
• and
• a pair of pump casings fixed to both ends of the casing via diaphragms fixed to both ends of the oscillator, and adapted to suction fluid from outside and discharge fluid to outside by reciprocating motion of the oscillator and elastic deformation of the diaphragms,
• wherein an electromagnet coil container is further provided inside the casing, the electromagnet coil container containing the pair opposing electromagnet coils, separated apart from each other forming a gap between the pair of opposing electromagnet coils along a direction perpendicular to a reciprocal moving direction of the oscillator so that the oscillator is located inside the gap, the pair of opposing electromagnet coils being contained in an airtight manner by the electromagnet coil container inside the casing, wherein electromagnet coil container has a box shape with an opening so as to contain the pair of opposing electromagnet coils in a space inside the electromagnet coil container, the space inside the electromagnet coil container, containing the pair of opposing electromagnet coils, is sealed from each of the diaphragms by a cover on the opening, and the electromagnet coil container is configured to prevent fluid penetrated into a space outside the electromagnet coil container from penetrating into a space inside the electromagnet coil container, and
• wherein the electromagnet coil container has a passage formed in between the pair of opposing electromagnet coils separated from each other for the oscillator to move in reciprocation and the passage is formed of an outer surface of a partition wall of the electromagnet coil container, preventing fluid penetrated into a space inside the passage from penetrating into a space inside the electromagnet coil container.