Blowoff valve using differential pressure of air

A blow-off valve (BOV) using differential pressure of air, the BOV comprising:

• a BOV base (100) having a flange (110) on the top, having an internal space, having a blowing port (130) connected with an outlet of a turbo blower, and having a discharge port (120) for discharging air flowing inside through the blowing port;
• a diaphragm (200) having a side being in contact with the flange, having a slope (210) inside, including a spring-coupling plate (230) formed on a side of the slope, and having a spring-coupling portion (220) at the center;
• an air hole (300) formed at a side of the slope of the diaphragm to function as an air channel;
• a spring (400) coupled to a spring-coupling portion formed at the center of the diaphragm;
• a BOV bonnet (500) having
• a bonnet flange (510) formed on the edge to be coupled to the flange of the BOV base with the diaphragm therebetween,
• a bonnet protrusion (520) formed inside the bonnet flange and protruding upward such that the bottom is higher than the bottom of the bonnet flange,
• a center hole (530) formed at the center of the bonnet protrusion,
• a horizontal portion (550) formed under the center hole of the bonnet protrusion,
• a spring seat (560) formed under the horizontal portion to be larger in diameter than the horizontal portion in order to seat an end of the spring thereon,
• a plurality of air inflow guide grooves (570) radially formed around the spring seat in the same horizontal plane as the spring seat in a form of a continuous groove such that air flows into the spring seat from an outside of the grooves, and
• a plurality of air induction expansion grooves (580) formed at ends of the plurality of air inflow induction grooves to expand in a form of continuous groove in the same horizontal plane at angles different from the ends of the plurality of air inflow induction grooves;
• a pipe (600) having a first end coupled to the center hole and a second end coupled to a solenoid valve;
• and
• a solenoid valve (700) coupled to the pipe.