Abstract: A vacuum cleaner and a fan assembly that includes a shell, a rotation shaft, a first impeller, a diffuser and a second impeller. The shell includes an air inlet and an air outlet in communication with each other. The rotation shaft is arranged in the shell and extends from the air inlet to the air outlet. The first impeller is arranged on the rotation shaft and located at a side of the air inlet. The diffuser is arranged in the shell and located at a side of the air outlet. The second impeller is arranged on the rotation shaft and located between the first impeller and the diffuser. The fan assembly may reduce working noise of the fan assembly while ensuring an air supply capacity of the fan assembly, and may reduce a radial size of the fan assembly, and may improve gas flow efficiency.

Abstract: A filtering time control method includes testing water quality to obtain a water quality status value, determining whether a current filtration meets requirements. Based on whether the current filtration meets the requirements, setting a duration of the next filtering based on the current filtration duration. Adaptive adjustment of the duration of filtration may ensure a filtering effect while saving water resources.

Abstract: A waterway plate assembly (100) for a water purifier and a water purifier having the same are provided. The waterway plate assembly (100) includes a waterway plate main body (10). The waterway plate main body (10) has a first end and a second end along a length direction of the waterway plate main body (10). The first end is provided with a filter cartridge interface (111) and the second end is provided with an electric element interface (112). With the waterway plate assembly (100) for the water purifier according to embodiments of the present disclosure, a separation of water and electricity is realized, and a short-circuited risk for the electric element during the replacement of the filter cartridge or a leakage of the filter cartridge interface is reduced.