A device structure for multistage water-air separation of a cleaning machine, including a water-air separation box (1), wherein the water-air separation box (1) is designed as a first shell extending towards upper right, an end of the water-air separation box (1) facing lower left is provided with a bottom plate (2) and an end of the water-air separation box (1) facing upper right is provided with a first port (101);
- a structure part (3) extending towards the upper right is arranged at a middle of the water-air separation box (1), an end of the structure part (3) facing the lower left is in contact with a middle of the bottom plate (2), a coarse filter screen (4) is provided between a rim of an end of the structure part (3) facing the upper right and an inner wall of the water-air separation box (1), the inner wall of the water-air separation box (1), an outer wall and the bottom plate (2) of the structure part (3), and the coarse filter screen (4) are enclosed into a primary separation bin (5), and the primary separation bin (5) surrounds the structure part (3) as a center;
- a side wall of the water-air separation box (1) is provided with an air inlet duct (6), one end of the air inlet duct (6) is provided with an air outlet (601) and extends into the primary separation bin (5), the air outlet (601) of the air inlet duct (6) is in a circumferential direction of the primary separation bin (5), the side wall of the water-air separation box (1) is also provided with a water outlet (102) communicated with an interior of the primary separation bin (5), and the first port (101) is connected with a main motor (7) having a suction function;
- the structure part (3) is designed as a second shell extending towards the upper right, the end of the structure part (3) facing the upper right is provided with a second port (301), the coarse filter screen (4) is configured to surround a rim of the second port (301) and extend outwards to the inner wall of the water-air separation box (1);
- an inner shell (8) is also arranged in the water-air separation box (1), the inner shell (8) is arranged at an upper right side of the coarse filter screen (4) and is configured as a third shell extending towards the upper right, an end of the inner shell (8) facing the upper right is provided with a third port (801) and an end of the inner shell (8) facing the lower left is provided with a fourth port (802), the third port (801) has a larger cross section than the fourth port (802), an edge of the third port (801) folds outwards and extends to the inner wall of the water-air separation box (1), and the fourth port (802) extends downwards to the lower left into the structure part (3);
- a side of the inner shell (8) facing the coarse filter screen (4) is provided with a plurality of guide vanes (9), and an air flow guide groove (901) is formed between two adjacent guide vanes (9);
- an inner wall of the structure part (3) and an outer wall of the inner shell (8) are enclosed into a secondary separation bin (10) which surrounds the inner shell (8) as a center, and an inner opening of the air flow guide groove (901) facing the inner shell (8) is in a circumferential direction of the secondary separation bin (10);
- the end of the structure part (3) towards the lower left is provided with a fifth port (302), a rim of the fifth port (302) is provided with a soft sealant (11), and an end of the soft sealant (11) closer to the bottom plate (2) folds outwards and closely fits with the middle of the bottom plate (2);
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- the water outlet (102) is arranged below the structure part (3) and is arranged at an end portion of the side wall of the water-air separation box (1) closer to the bottom plate (2);
- a wastewater tank (12) is arranged below the water-air separation box (1), a top of the wastewater tank (12) is provided with a water inlet (1201) which is communicated with the water outlet (102), and the water inlet (1201) is provided with a valve (13).