Adjustable gas drying device

The utility model discloses an adjustable gas drying device which comprises an upper end cover, a lower end cover and a plurality of screen layers, the peripheral walls of the upper end cover and the lower end cover are provided with an upper convex ring and a lower convex ring respectively, a plurality of through holes are formed in the convex rings, and pressing devices are arranged in the corresponding through holes of the upper convex ring and the lower convex ring so that the screen layers can be pressed and fixed between the upper end cover and the lower end cover. An air inlet pipe is arranged on the lower end cover, an air outlet pipe is arranged on the upper end cover, flanges are arranged on the air inlet pipe and the air outlet pipe, a water return one-way valve is arranged in the middle of the lower end cover, each screen layer is composed of a screen frame and a screen, the screen is conical, and a water return pipe is arranged in the middle of each screen layer. The lower end of the water return