44results about How to "Improve breathing environment" patented technology

The invention discloses a method and a device for protecting harmful bacteria and viruses in a densely populated area, and belongs to the technical field of pathogenic bacteria and virus protection. According to the protection method, a single person enters a closed room for the single person so as to be subjected to cross infection protection. The protection device comprises a closed room where the single person is located alone, wherein a door, an air inlet and an exhaust pipe are arranged on the closed room; a negative pressure air suction cavity connected with the exhaust pipe is formed inthe closed room; a first sterilization device is arranged at the air inlet; and a second sterilization device is arranged on the exhaust pipe. According to the method and the device for protecting the harmful bacteria and the viruses in the densely populated area provided by the invention, by arranging the closed room where the single person is located alone, air entering the closed room and airexhausted out of the closed room are treated through the sterilization device, so that the air entering the closed room and the air exhausted out of the closed room are safe, a comfortable and safe environment space can be provided for people in the densely populated area, and pathogenic bacteria and virus cross infection is prevented. The protection device provided by the invention is reasonablein structure and low in cost, and the protection device and method are suitable for application and popularization.

The invention belongs to the technical field of dustproof covers, and particularly relates to a dustproof cover used for a building engineering stirring machine. The dustproof cover comprises a coversleeve, a cover body, a heavy block, a strip swing plate, a volute spiral spring, a first incomplete bevel gear, a second incomplete bevel gear, a supporting lug, a cam and the like; a dustproof covercan be automatically opened when a feeding and discharging opening in a stirring cylinder needs to carry out feeding or discharging, in the stirring process of concrete raw materials in the stirringcylinder, the feeding and discharging opening in the stirring cylinder is covered by the dustproof cover, and therefore when the concrete raw materials are turned over in the stirring cylinder to cause a large amount of raw material dust, the dust cannot drop out of the feeding and discharging opening of the stirring cylinder and diffuse to the surrounding air, the phenomenon that the dropped-outraw material powder causes pollution to the surrounding air of the concrete stirring machine is avoided, and a certain environment-friendly effect is achieved; the structure is simple, and the good use effect is achieved.

The invention belongs to the field of dust covers, and particularly relates to a concrete mixer dust cover applied in the constructional engineering field. The concrete mixer dust cover comprises a cover case, a cover, a second revolving shaft, a stripped swing board, a heavy block, a second arc-shaped rack, a hinging plate, vortex springs, a belt and a driving gear and the like, wherein the dustcover can be opened automatically when materials need to be charged or discharged through feeding and discharging holes in a stirring barrel; the feeding and discharging holes in the stirring barrel are shielded by the dust cover in a process of stirring the concrete raw material in the stirring barrel, so that a large amount of raw material dust generated by rolling of the concrete raw material in the stirring barrel is prevented from leaking from the feeding and discharging holes and being diffused to surrounding atmosphere, the pollution of atmospheric air around a concrete mixer caused bythe leaking raw material dust is avoided, and the environment is protected at a certain degree. The concrete mixer dust cover has a simple structure, and a better using effect.