Flow splitter and rain separator comprising the same

A device, comprising:

• 1) a first plate comprising a slot and a rotation axle mounted in the slot wherein the rotation axle defines a pivot axis extending along a length of the slot;
• and
• 2) a second plate comprising a first subplate and a second subplate connected to the first subplate, and the first subplate comprising one end provided with a flange;
• wherein:
• the second plate further comprises two gaps disposed on a junction of the first subplate and the second subplate;
• the two gaps are configured to snap fit with an edge of the slot at two ends, respectively;
• the second plate is coupled to the first plate through the slot and mounted on the rotation axle;
• the second plate is pivotally supported with respect to the first plate about the pivot axis;
• a critical condition of an overturn of the second plate with respect to the first plate is
• m
• 3
• ⁢
• g
• ⁢
• L
• 3
• ≤
• m
• 2
• ⁢
• gL
• 2
• +
• m
• 1
• ⁢
• g
• ⁢
• L
• 1
• 2
• ;
• in the overturn state of the second plate, the following condition is satisfied:
• m3gL3≤m2gL2+m4gL5;
• a critical condition of resetting of the second plate is m3gL3>m2gL2+m5gL7;
• m1 represents a mass of present rainwater when the second plate is about to overturn;
• L1 represents a length of the first subplate;
• m2 represents a mass of the first subplate;
• L2 represents a normal distance between a center of gravity of the first subplate and the pivot axis;
• m3 represents a mass of the second subplate;
• L3 represents a normal distance between a center of gravity of the second subplate and the the pivot axis;
• m4 represents a mass of present rainwater on the first subplate in the overturn state of the second plate;
• m5 represents a mass of present rainwater on the first subplate when the second plate is about to reset;
• L5 represents a normal distance between a point of application of a force by present rainwater on the first subplate and the pivot axis when the second plate is in the overturn state;
• L7 represents a normal distance between a point of application of a force by present rainwater on the first subplate and the pivot axis when the second plate is about to reset;
• and
• g represents a gravitational constant.