Nuclear power plant start and stop feed water pump

Abstract

The invention relates to a start-stop water feeding pump of a nuclear power station. The start-stop water feeding pump comprises a barrel body and a core bag which is entirely nested inside the barrel body, wherein the barrel body is in pipeline connection with an inlet and an outlet outside; a pump inlet and a pump outlet are perpendicularly distributed upwards; a structure of the core bag is that a mechanical seal I and a drive-end bearing component are arranged at one end of a pump shaft, and a mechanical seal II and a free-end bearing component are arranged at the other end of the pump shaft; and a suction section, a middle section, a balance mechanism and a press plate are sequentially mounted on the pump shaft, the suction section is connected with a bearing body of the drive-end bearing component, and the press plate is connected with a bearing body of the free-end bearing component. According to the start-stop water feeding pump of the nuclear power station, the maintenance time is substantially shortened, the support capacity and the service performance of equipment is greatly improved, the scour-resistant capacity is improved, the service life is prolonged, and the higher efficiency and the stable operating characteristic of the pump are guaranteed; a double-casing structure is adopted, namely, the pump is provided with two layers of press-bearing boundaries, so that the pressure-bearing reliability is doubled; and the safety of the pressure-bearing structures of the pump is ensured.

Description

technical field

[0001] The invention relates to a feedwater pump, in particular to a nuclear power plant start-stop feedwater pump. Background technique

[0002] The start-stop feed water pump is one of the main equipment of the start-stop water supply system of the PWR nuclear power plant. Its function is to provide auxiliary feed water to the secondary side of the steamer during the normal start-up and shutdown of the nuclear power plant. Whether the start-stop feedwater pump can work normally and safely will determine whether the nuclear power unit can be started and shut down for maintenance as planned.

[0003] In the prior art, when the pump is installed, the impeller is mostly installed on the pump shaft first, the two ends of the impeller are respectively installed with sealing sleeves, the pump shaft is inserted into the pump body, and one end of the pump shaft is inserted into the pump cover. The pump cover is fixed on the pump body, and then the sealing structure...

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