Negative pressure exhaust device of steam turbine shaft seal cooler

A negative pressure exhaust device of a steam turbine shaft seal cooler belongs to the technical field of steam turbine shaft seal steam cooling equipment and is used for improving the cooling efficiency of the steam turbine shaft seal cooler. According to the technical scheme, a steam exhaust pipeline is composed of a medium-pressure steam inlet, a nozzle and a diffuser pipe, the front end of the nozzle is connected with the medium-pressure steam inlet, the rear end of the nozzle is connected with the diffuser pipe, the side wall of the nozzle is provided with a communicating pipe perpendicular to the length direction of the nozzle, and the communicating pipe of the nozzle is connected with a steam exhaust port in the upper portion of the side wall of a cooler body. An air inlet of the nozzle is connected with the medium-pressure steam inlet, a spout of the nozzle is connected with the diffuser pipe, the diffuser pipe is a conical pipe, and the diameter of the end, connected with the nozzle, of the diffuser