Single-rod viscous damper and vibration damping device

The utility model relates to a single-rod viscous damper and a vibration damping device, the single-rod viscous damper comprises a cylinder barrel and a piston rod, a piston is arranged in the cylinder barrel, and the piston is provided with an air bag; one end of the piston rod extends into the cylinder barrel to be connected with the piston, the other end of the piston rod extends out of the cylinder barrel, an inflation hole is formed in the piston rod and communicated with the air bag, and the air bag is arranged at the end away from the piston rod. The air bag is installed on the piston, the air inflation hole communicated with the air bag is formed in the piston rod, air can be inflated into the air bag through the air inflation hole, it is guaranteed that the pressure of the air bag is moderate when the air bag is used, and when the piston and the cylinder barrel move relatively, the air bag can be compressed to be small or expanded; dynamic balance of the volume of the damping media on the two sides o