Abstract: A variable acceleration curved surface spiral gear transmission mechanism for accelerated oscillator damper damping systems is disclosed. Through the orthogonal orbit planetary gear set moving along the parallel circular arc line guide rail, the concave surface spiral gear and the convex surface spiral gear are meshed at different radii, so as to realize the continuous changing of the speed ratio and changing of the acceleration of the additional mass block. The spiral curve limit guide groove is set on the surface of concave surface spiral gear and convex surface spiral gear, and the changing rate of speed changing ratio is adjusted by designing different spiral curves, and then the acceleration changing rate of additional mass block is controlled.

Abstract: A variable acceleration curved surface spiral gear transmission mechanism for accelerated oscillator damper damping systems is disclosed. Through the orthogonal orbit planetary gear set moving along the parallel circular arc line guide rail, the concave surface spiral gear and the convex surface spiral gear are meshed at different radii, so as to realize the continuous changing of the speed ratio and changing of the acceleration of the additional mass block. The spiral curve limit guide groove is set on the surface of concave surface spiral gear and convex surface spiral gear, and the changing rate of speed changing ratio is adjusted by designing different spiral curves, and then the acceleration changing rate of additional mass block is controlled.

Abstract: An aquarium includes a lower hollow body which defines a lower chamber and an upper hollow body which defines an upper chamber. A mount plate is removably mounted in a bottom of the lower chamber and a waterproof housing is provided on the mount plate to receive a pump therein. The upper hollow body includes a plate and a housing projecting upward from the plate to define the upper chamber. A water inlet is formed in the plate beyond the housing, through which water is inputted into the lower chamber. An air passage is formed in an upper wall of the housing. A float is movably provided to the housing to block the air passage for isolating the upper chamber unless the float is raised. A protrusion projects upward from the upper wall of the housing, defining a cavity above the upper chamber. An inlet pipe has a lower end attached to the pump and an upper end extending into the cavity defined by the protrusion, preventing water from entering into the inlet pipe.