Abstract: Disclosed are devices, systems and methods for air purification in an airflow tract of vacuum cleaners. In some aspects, an air purification system for a vacuum cleaner comprises an ultraviolet (UV) light unit disposed in a first location within the vacuum cleaner along an airflow pathway, configured to emit UV light at air containing particles including dust, dirt, and microbes while the air containing the particles is flowing in the airflow pathway where the UV light unit is disposed; and a particle filter unit disposed in a second location within the vacuum cleaner along the airflow pathway, the particle filter unit comprising one or both of a high-efficiency particulate air (HEPA) filter and an active carbon filter.

Abstract: Disclosed are devices, systems, and methods for modular vacuum cleaners. An example vacuum cleaner system includes a canister vacuum cleaner device and a robotic vacuum cleaner device, where the robotic vacuum cleaner is removably coupled to or is digitally communicable with the canister vacuum cleaner device. The canister vacuum cleaner device comprises a canister to collect debris, a vertical hollow structure that located towards a rear of the canister and coupled to the canister, a flexible extendable hose, and a housing located below the canister, wherein the housing includes a retractable electrical cord. The robotic vacuum cleaner device comprises: a storage area to collect debris, a battery, a plurality of wheels that are removably coupled to one or more motors, and a lever or a valve structured to direct debris either to the storage area or to the canister.

Abstract: Disclosed are devices, systems, and methods for vacuum cleaners, including vacuum cleaners with corner suction functionality. An example vacuum cleaner includes a suction channel assembly that has a main channel including a main suction input and one or more branch channels connected to the main channel and extending away from the main channel, each branch channel having an opening forming an auxiliary suction input. The vacuum cleaner can have a valve positioned between the main channel and at least one branch channel. The valve can be operable to open or close to allow or block suction through the branch channel and/or open or close to allow or block suction through the main channel. The vacuum cleaner can include a lower assembly that carries the suction channel assembly. Each branch channel opens to an exterior of the lower assembly, such as through a front corner of the lower assembly.