Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a household high-efficiency ozone nano-bubble water generation system, comprising a water production and storage tank (3), a nano-bubble generator (4) and an air source type ozone generator (5), wherein the nano-bubble generator (4) comprises a circulating pipeline; an external circulating water pump (4-1) and a generator pump head (4-2) are connected to the circulating pipeline in series; and a microporous air stone (4-3) with a pore diameter of 10-100 μm is arranged in the generator pump head (4-2).
A: Disclosed is a crop cleaning machine capable of carrying out pesticide removal and sterilization, while improving the cleaning performance thereof. The crop cleaning machine (1) comprises: a cylindrical cleaning tub (10) for accommodating crops; a pump (40) for sucking in and discharging water stored in the cleaning tub (10); an ozone generator (50) for generating ozone-containing air; and a bubbly water generator (60) for taking in water discharged from the pump (40) and the ozone-containing air generated by the ozone generator (50) and for spraying bubbly water, obtained by mixing small bubbles containing ozone in water, into the cleaning tub (10) from a spray port (15) of the bubbly water generator (60). The spray port (15) is provided at a position, offset from a central axis (P) of the cleaning tub (10), on the bottom of the cleaning tub (10), and sprays the bubbly water in an oblique upward direction, and the oblique upward direction intersects with a radial direction starting from the central axis (P) when the cleaning tub (10) is viewed from above.
B: A device and method for extracting components in a solid by using nanobubbles. The device comprises a reaction vessel (2) for holding a solid to be extracted, a nanobubble generation means (3) for generating a nanobubble-containing liquid, and an energy generator; the nanobubble-containing liquid is mixed with the solid to be extracted; the energy generator is configured to emit energy into the reaction vessel (2) to burst nanobubbles, so that the effect of extracting the solid in the liquid is enhanced.
C: A microbubble generator and a washing device. The microbubble generator (100) comprises: a dissolved air tank (1), a partition (3), and a cavitation piece (4). The dissolved air tank (1) defines a dissolved air cavity (10) thereinside and is provided with an inlet (14) and an outlet (15), and the inlet (14) is located above the outlet (15). The partition (3) is disposed in the dissolved air tank (1), the baffle (10) partitions at least part of the dissolved air cavity (10) into a bubble dissolving area communicated with the inlet (14) and a water flow discharge area communicated with the outlet (15), and water flow in the bubble dissolving area passes by the partition (3) and enters the water flow discharge area. The cavitation piece (4) is connected to the outlet (15) or disposed at the outlet (15).
D: An outdoor fresh air purifying system, comprising a fresh air pipeline (1) and a return air pipeline (2). The fresh air pipeline (1) and the return air pipeline (2) are both connected to a purification dust collector (3) before being connected to an indoor air inlet, an air inlet is provided on the lower part of the purification dust collector (3), an air outlet is provided on the top part of the purification dust collector (3), the air outlet is connected to the indoor air inlet, the bottom part of the purification dust collector (3) is provided with a nano foam machine (4), the nano foam machine (4) is in communication with a spraying device (7) in the purification dust collector (3) through a circulating pipeline (6), the circulating pipeline (6) is provided with a circulating water pump (5), the circulating water pump (5) presses high-density nano foam generated by the nano foam machine (4) in the spraying device (7), and the air outlet is provided with a drying device (8).
Answer: C