Spray arm structure for dish-washing machine

The invention is applicable to the technical field of dish-washing machines, and discloses a spray arm structure for a dish-washing machine. The spray arm structure for the dish-washing machine comprises a spray arm body. The spray arm body is provided with a circular water inlet and discharging holes. A diversion structure is arranged inside the spray arm body. The diversion structure comprises a first lower diversion face, a second lower diversion face, a third lower diversion face and a fourth lower diversion face which are arc-shaped. The position, corresponding to the end of the water inlet, inside the spray arm body is provided with an upper diversion arc-shaped face. The ratio between the arc radius of the first lower diversion face or the arc radius of the second lower diversion face and the diameter of the water inlet is equal or larger than 0.3 and equal or smaller than 0.6. The ratio between the arc radius of the third lower diversion face or the arc radius of the fourth lower diversion face and the diameter of the water inlet is equal or larger than 0.4 and equal or smaller than 0.6. The ratio between the arc radius of the upper diversion arc-shaped face and the diameter of the water inlet is equal or larger than 0.05 and equal or smaller than 0.1. According to the spray arm structure for the dish-washing machine, the pressure loss of a water channel of the spray arm structure is little, and the spray arm structure is energy conserving and environmentally friendly.