The utility model discloses a
siphon type roof drain matched with a single-layer flexible roof, which comprises a water collecting hopper, a waterproof coiled material, a fixing ring and a
shunting grating cover, the top end of the water collecting hopper radially extends to form a fixed supporting structure, the waterproof coiled material is arranged on the upper side of the fixed supporting structure, and the waterproof coiled material extends out of the fixed supporting structure. A through hole is formed in the position, corresponding to an upper end opening of the water collecting hopper, of the waterproof roll, the fixing ring penetrates through the through hole to be fixedly connected with the water collecting hopper, the fixing ring limits the waterproof roll on the side, away from the fixed supporting structure, of the waterproof roll, an anti-vortex structure is arranged in the fixing ring, and the flow dividing
grating covers the fixing ring. The roof drain is better in waterproof performance, and the quality is guaranteed; on-site materials are few, and installation is easy; by the adoption of the
assembly type construction technology, the site operation difficulty is lowered, the procedure steps are reduced, the construction efficiency is improved, and the construction quality is guaranteed; installation and maintenance are easy;
siphon is generated at the lower
water level in front of the bucket, and the load rising hidden danger caused by roof accumulated water can be reduced.