One-way buffer is a kind of buffer used for slowly screwing the toilet seat cover, also known as cover plate descent device and damper.
　　The inner wall of the shaft shell is provided with two opposite longitudinal ribs, and one end of the shaft shell is provided with two opposite longitudinal ribs and is arranged in the shaft shell, and the other end extends outside the shaft shell and is provided with a rib groove. The two ends are hermetically sleeved to form a sealed cavity, and damping oil is injected into the sealed cavity. The longitudinal ribs of the shaft are provided with a round groove and are movably pivoted with a damping sheet to form a check valve. It can be widely used in all kinds of toilet seat covers, and can make the cover surface easy to open and slow to fall, which is simple, practical and has ideal effect.
　　The utility model relates to a rotary buffer, which comprises a barrel and a shaft core, wherein the inner wall of the barrel is provided with a raised partition plate; one end of the shaft core is installed in the inner cavity of the barrel to form a sealed cavity with the barrel; the other end of the shaft core extends out of the barrel; the shaft core is also provided with a wing tangent to the inner wall of the barrel; blades are arranged between the shaft core and the partition plate; the partition plate, blades and wings divide the inner cavity of the barrel into an unpressurized cavity and a pressurized cavity; and damping is installed in both the unpressurized cavity and the pressurized cavity. The blade comprises an arc-shaped main board, oil sealing ribs and oil unloading ribs arranged at the front and rear sides of the arc-shaped main board, the back of the arc-shaped main board is propped against the shaft core, an active space for inserting a spacer is formed between the oil sealing ribs and the oil unloading ribs, and the oil unloading ribs and the arc-shaped main board are provided with a plurality of oil unloading notches. It is a rotary buffer with good buffering effect, durable blade, good product quality, small processing error, convenient processing and simple structure.