Abstract: A smoke detector includes: a housing; a sensing chamber in the housing, wherein in the sensing chamber, a first light emitter and a first light receiver that are disposed at the periphery of the sensing chamber and facing a middle portion of the sensing chamber are included, a first baffle is included in the sensing chamber, the first baffle is disposed adjacent to the first light emitter and includes a baffle body and a branch portion, the baffle body extends from the periphery of the sensing chamber toward the middle portion, and the branch portion comprises a plurality of sub-baffles branching off the baffle body; and a circuit board electrically connected to the first light emitter and the first light receiver respectively.

Abstract: A smoke detector includes: a housing; a sensing chamber in the housing, wherein in the sensing chamber, a first light emitter and a first light receiver that are disposed at the periphery of the sensing chamber and facing a middle portion of the sensing chamber are included, a first baffle is included in the sensing chamber, the first baffle is disposed adjacent to the first light emitter and includes a baffle body and a branch portion, the baffle body extends from the periphery of the sensing chamber toward the middle portion, and the branch portion comprises a plurality of sub-baffles branching off the baffle body; and a circuit board electrically connected to the first light emitter and the first light receiver respectively.

Abstract: A fire alarm device includes: a base portion; a press portion capable of moving relative to the base portion to deviate away from the base portion or close to the base portion; an alarm switch capable of moving relative to an alarm circuit, to control turn-on and turn-off of the alarm circuit; and a plurality of buttons mounted on the base portion and capable of converting movement of the press portion to movement of the alarm switch; wherein the device has an alarm enable position, wherein, the press portion deviates close to the base portion, to press the plurality of buttons and indirectly press the alarm switch to turn on the alarm circuit; and an alarm disable position, wherein, the press portion deviates away from the base portion, to release the plurality of buttons and indirectly release the alarm switch to turn off the alarm circuit.

Abstract: A fire alarm device includes: a base portion; a press portion capable of moving relative to the base portion to deviate away from the base portion or close to the base portion; an alarm switch capable of moving relative to an alarm circuit, to control turn-on and turn-off of the alarm circuit; and a plurality of buttons mounted on the base portion and capable of converting movement of the press portion to movement of the alarm switch; wherein the device has an alarm enable position, wherein, the press portion deviates close to the base portion, to press the plurality of buttons and indirectly press the alarm switch to turn on the alarm circuit; and an alarm disable position, wherein, the press portion deviates away from the base portion, to release the plurality of buttons and indirectly release the alarm switch to turn off the alarm circuit.

Abstract: The present invention provides a slurry catalyst and a method for preparing the same, and belongs to the technical field of preparing catalyst. Particularly, the present invention provides a slurry catalyst directly used in a slurry bed reactor for synthesizing methanol and dimethyl ether and a method for preparing the same, which uses the complete liquid phase preparation from solution to slurry without the conventional slurry-producing process of firstly forming a solid catalyst and dispersing it into an inert medium after crushing and milling. This catalyst mainly comprises Cu, Zn, Al and Zr, wherein atomic ratios of each of components are Cu/Zn/(Al+Zr)=1/0.1-5/0.15-15 and Zr/Al=1:1.0-1:30, and one or two selected from the group consisting of lanthanide metals, Mn, Mo, Si, V, W, Cr, Mg, Ni, K, Pd, Rh, Ru, Re, Pt and Sr is used a promoter.

Abstract: The present invention provides a slurry catalyst and a method for preparing the same, and belongs to the technical field of preparing catalyst. Particularly, the present invention provides a slurry catalyst directly used in a slurry bed reactor for synthesizing methanol and dimethyl ether and a method for preparing the same, which uses the complete liquid phase preparation from solution to slurry without the conventional slurry-producing process of firstly forming a solid catalyst and dispersing it into an inert medium after crushing and milling. This catalyst mainly comprises Cu, Zn, Al and Zr, wherein atomic ratios of each of components are Cu/Zn/(Al+Zr)=1/0.1-5/0.15-15 and Zr/Al=1:1.0-1:30, and one or two selected from the group consisting of lanthanide metals, Mn, Mo, Si, V, W, Cr, Mg, Ni, K, Pd, Rh, Ru, Re, Pt and Sr is used a promoter.