Ejection device for lifesaving gasbag

The utility model relates to an ejection device for a lifesaving gasbag, which comprises a three-way casing, wherein one end of the casing is an air inlet end for being communicated with an air inlet of high-pressure gas, the other end of the casing is an air outlet end for being communicated with a gasbag, one final end of the casing is an air door end for being communicated with the outside atmosphere, the three ends are mutually communicated, the air door end is provided with an end cover, an air door hole is arranged on the end cover, the inner side of the end cover is fixedly provided with a pressing plate of an air door, which can be used for opening and closing the air door hole by elastic deformation under the action of air pressure at both sides of the air door hole, and the pressing plate of the air door comprises a fixing part fixed on the end cover and an elastic bending part for covering and sealing the air door hole. The device can be repeatedly used, and the problem of safety of a chemical mode also does not exist; air is sucked by utilizing negative pressure generated when the high-pressure gas is injected into the gasbag; and moreover, the inflation of the air is finished, the air door can also be automatically sealed. The entire device has light weight and large ejection ratio, is reliable in sealing, is automatically closed in a sucking way after ejection and is very convenient to use and maintain.