Multi-layer water film type flocculant powder pre-dissolving device and corresponding automatic dosing machine pre-dissolving mechanism

The invention discloses a multi-layer water film type flocculant powder pre-dissolving device and a corresponding automatic dosing machine pre-dissolving mechanism. The flocculant pre-dissolving device comprises a preliminary mixing chamber, a main pre-dissolving chamber, a reinforced pre-dissolving chamber and an upper tangential water inlet, the key point of the innovative scheme is that a middle conical surface water inlet, a lower dispersing water inlet and a rotary water dispersing device are additionally arranged on the basis of an existing single-layer water film type powder pre-dissolving device, and the multi-layer water film type flocculant powder pre-dissolving device is improved; the upper tangential water inlet is tangentially opposite to the inner wall of the primary mixing chamber, the middle conical surface water inlet is opposite to the conical surface of the main pre-dissolving chamber, and the lower dispersing water inlet is opposite to the rotary water dispersing device, so that upper, mid