The invention provides a steam exhausting cylinder of an axially-exhausting
steam turbine unit and relates to an exhausting cylinder of a
steam turbine unit. The invention aims to solve the problems that a steam exhausting cylinder workshop of a
steam turbine unit has high construction cost and the steam exhausting energy is lost when the steam exhausting energy of a radially-exhausting steam
turbine unit enters an external condenser from the steam exhausting cylinder. The exhausting cylinder comprises a bearing box
assembly and further comprises a
water spray mechanism, a
smoke discharge mechanism, a shell of the steam exhausting cylinder, an oil path mechanism, a steam-exhausting, flow guide and
diffusion mechanism and a steam sealing body of the steam exhausting cylinder, wherein the steam-exhausting, flow guide and
diffusion mechanism comprises a second
flange, a flow guide cover and two semi-conical
diffusion guide flow cylinders; the steam sealing body of the steam exhausting cylinder comprises a steam sealing shell, a high-pressure steam inlet
pipe, a micro-negative-pressure steam suction
pipe, two first fixing plates and two second fixing plates; and the bearing box
assembly comprises a bearing pedestal mounted with a bearing, a bearing box body, a sixth
flange and a bearing box protective cover. The steam exhausting cylinder is applied to the steam
turbine unit.