Spray nozzle structure of turbo expander

The invention provides a spray nozzle structure of a turbo expander. The spray nozzle structure comprises an annular spray nozzle main body and a pull rod mechanism for adjusting the opening/closing of the spray nozzle main body, wherein the spray nozzle main body comprises a cover plate, a rotary disc and an end cover, the pull rod mechanism is connected in the radial direction of the rotary disc; the single face of the end cover is fixedly arranged on the cover plate; the rotary disc and a spray nozzle blade are arranged between the cover plate and the end cover in sequence; the spray nozzle blade is connected onto the end cover through a fixing pin; the rotary disc is pressed and covered on the spray nozzle blade; a cylindrical helical spring is also arranged between the cover plate and the rotary disc, and can enable the rotary disc to tightly press the spray nozzle blade. By applying the spray nozzle structure, as the rotary disc and the spray nozzle blade can be in tight contact, the zero-clearance axia