The invention discloses an automatic-adjustment variable-flow
siphon rainwater hopper. The rainwater hopper comprises a shell
assembly, a flow guide
assembly and a rectification
assembly; the shell assembly comprises a rainwater hopper body and a
tail pipe, wherein the lower wall of the rainwater hopper body communicates with the upper end of the
tail pipe; and the flow guide assembly comprises afirst guide rod, a flow guide cover and a first floating body, wherein the first guide rod is fixedly welded to the upper side of the rainwater hopper body, a first external thread is arranged on theupper portion of the first guide rod, and a first limiting nut is connected to the surface of the first external thread in a threaded mode. According to the rainwater hopper, the first floating body is arranged on the flow guide cover, a second floating body is arranged on a
rectifier, the first floating body and the second floating body generate
buoyancy in water, and along with ascending and descending of the
water level, the flow guide cover and the
rectifier can ascend or descend along guide rods; when the flow guide cover and the
rectifier ascend, the water passing sectional area is increased, and the
drainage flow is increased; and when the flow guide cover and the rectifier descend, the water passing sectional area is reduced, the
drainage flow is reduced, and the requirement for rapid drainage can be met.