Waterproof connector having internally concealed grounding pin

A waterproof connector having internally concealed grounding pin, comprising:

• an outer housing, formed by a metal frame and an isolation layer, the isolation layer covered on an outer edge and an inner edge of the metal frame by injection molding, a front end and a rear end of the outer housing communicated with each other to form a first accommodating space inside, a part of the inner edge of the metal frame exposed to the first accommodating space to form at least one grounding part, the metal frame provided with at least one outer grounding pin protrudingly disposed at the outer edge thereof, the at least one outer grounding pin penetrating the isolation layer and exposed out of the isolation layer;
• an inner casing, made of metal material, a front end and a rear end of the inner casing communicated with each other to form a second accommodating space inside, the inner casing provided with at least one inner grounding pin protrudingly disposed at a periphery of the rear end thereof, wherein when the inner casing is mounted into the first accommodating space via the rear end of the outer housing and assembled inside the outer housing, the inner grounding pin is abutted against the grounding part;
• a terminal block, formed by plastic integrally and provided with a tongue plate protrudingly disposed at a front end thereof, and tongue plate provided with a plurality of connection terminals fixedly disposed therein, ends of the plurality of connection terminals exposed on a surface of the tongue plate and other ends of the plurality of connection terminals extended out of a rear end of the terminal block, wherein the terminal block is mounted into the second accommodating space via the rear end of the inner casing and assembled inside the inner casing;
• and
• a waterproof glue layer, watertightly filled in the rear ends of the outer housing and the inner casing in a condition that the inner casing and the terminal block are assembled inside the outer housing, and the plurality of connection terminals watertightly penetrating out of the waterproof glue layer.