Small air pump

An air pump is installed in a shell, the shell comprises a bottom shell, an upper shell and a top cover, an opening of the bottom shell faces upwards, an air pump installation base is arranged in the middle of the bottom shell, a first fixing frame is arranged on the upper side of the air pump installation base, and the first fixing frame comprises two vertical plates and a transverse plate located at the top ends of the vertical plates; a semicircular fixing plate with a downward opening is arranged on the lower side of the transverse plate; a first damping and heat-insulating coaming surrounding the air pump mounting base is further arranged in the bottom shell, an opening of the upper shell faces downwards, a second damping and heat-insulating coaming is arranged on the lower side of the top plate, a heat dissipation window is arranged on one side of the upper shell, and a fan mounting clamping groove corresponding to the heat dissipation window is formed in the second damping and heat-insulating coaming;