Waste heat discharge pump for nuclear power plant

Abstract

The invention discloses a waste heat discharge pump for a nuclear power plant, which comprises a stator component, a rotor component, a bearing component and a shaft seal device. The stator component comprises a pump casing, guide vanes arranged in the cavity of the pump casing, a pump cover connected at the front end of the pump casing and a sealing box body connected at the front end of the pump cover. The rotor component comprises a pump shaft and vane wheels sleeved on the pump shaft through vane wheel nuts and located in the cavities of the guide vanes. The bearing component comprises a bearing body, bearing pressing covers, a driving end bearing and a non-driving end bearing, wherein the front portion and the rear portion of the bearing body are respectively provided with bearing cavities, the bearing pressing covers are covered at two ends of the bearing body, and the driving end bearing and the non-driving end bearing are arranged in the bearing cavities one by one. The shaft seal device is a containerization balanced type single end face mechanical seal and is arranged in the cavity of the sealing box body. The rotor component further comprises a retainer gasket which is arranged between the vane wheel nuts and the vane wheels in a mode that a tongue piece of the retainer gasket is covered on the planes of the vane wheel nuts. The bearing component further comprises a cooling water jacket and a cooling water pipeline, and a bearing protector is respectively arranged in cavities of the bearing pressing cover at two ends.

Description

technical field [0001] The invention relates to a waste heat discharge pump for a nuclear power plant. Background technique [0002] The structure of the current waste heat discharge pump for million-kilowatt pressurized water reactor nuclear power plant is a horizontal, single-stage, single-suction, cantilever centrifugal pump. The main functions of the pump are: discharge the waste heat of the reactor core, discharge the primary circuit and The sensible heat of the equipment and the heat generated by the main pump are discharged. [0003] The diameter of the largest outer circle of the impeller nut of the existing million-kilowatt pressurized water reactor nuclear power plant waste heat exhaust pump is 102mm, and the outer diameter of the inlet end of the impeller rear cover is 113mm, that is, the maximum outer diameter of the impeller nut is larger than the inlet of the impeller rear cover. The outer diameter of the end is 11mm smaller, so that the liquid entering the im...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a waste heat discharge pump for nuclear power plants, which can well meet the requirements of nuclear power plants and solve the problem of excessive axial force when the waste heat discharge pumps of nuclear power plants transport high-temperature media , the bearing generates a lot of heat, the maintenance is inconvenient, the shock resistance is poor, and the high-temperature steam and possible condensed water entering the bearing in the LOCA environment will damage the grease, etc.

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