Sealing joint on oxygen bag

A sealing joint on oxygen bag comprises an air inlet pipe fixed to the oxygen bag, an outer jacket is inserted into the tail end of the air inlet pipe in a sleeved mode, an inner jacket is formed on the inner side of the outer jacket, the air inlet pipe is clamped and fixed between the outer jacket and the inner jacket, and an upper boss and a lower boss are formed at the upper end and the lower end of the outer wall of the outer jacket respectively; a spherical valve element is inserted into the inner jacket and abuts against the inner wall of the inner jacket, a cutting groove is formed in the outer wall of one side of the valve element, an upper connecting shaft and a lower connecting shaft are formed at the upper end and the lower end of the valve element respectively, and the upper end of the upper connecting shaft penetrates through the inner jacket, the outer jacket and the upper boss to be sleeved with a rotary knob in an inserted mode. And the lower end of the lower connectingshaft penetrates through