Abstract

A universal pump casing (1) for a nuclear power main pump, the universal pump casing comprising: a spherical housing (11); a discharge section (12), which is arranged on one side of the spherical housing (11) and configured to connect to a cold-end pipeline of a system; a suction section (14), which is arranged at an axial upper end of the spherical housing (11) and configured to connect to a steam generator (2) and a suction guide pipe (3) of a main pump; and an annular end cover (15), which is located at an axial lower end of the spherical housing (11) and configured to connect to a main pump cartridge (6), wherein the annular end cover (15) is provided with a plurality of main bolt holes (151), which are spaced apart; and one side of each main bolt hole (151) is provided with a positioning spigot (152), and the other side thereof is provided with a positioning end face (153).

IPC Classes  ?

• F04D 29/42 - CasingsConnections for working fluid for radial or helico-centrifugal pumps
• F04D 29/44 - Fluid-guiding means, e.g. diffusers

Abstract

Disclosed is a filtering device for an emergency injection water system of a main pump of a nuclear power station, the filtering device comprising: a pressure-bearing component, which comprises a chamber (12), an upper seal head (14), a barrel (16) and a lower seal head (18), which are sequentially fixedly connected from bottom to top, the chamber (12) being provided with a water inlet port (120), a water outlet port (122) and an overflow port (124); a cover plate (26), which is fixedly connected to the top of the chamber (12) and forms a cavity (126) with the chamber (12); a seal ring (28), which is arranged between the cover plate (26) and the chamber (12); a conical tube (30), which is embedded in the chamber (12) and the upper seal head (14); and a settling separation component (32), which is arranged in the barrel (16).

IPC Classes  ?

• B01D 36/04 - Combinations of filters with settling tanks

Abstract

Disclosed is a passive stopping seal assembly (30) of a nuclear reactor coolant pump, comprising a sealing ring (40), a tightening ring (60) and a fusible support block (50). The sealing ring (40) is an opening ring, and in a normal operating condition, the sealing ring (40) surrounds, in an opening state, a pump shaft (18) and keeps a clearance from the pump shaft (18). The tightening ring (60) encircles an outer peripheral wall of the sealing ring (40) to provide, when the plant is in an outage, a clasping force great enough on the sealing ring (40) such that the sealing ring (40) is driven to tightly clasp the pump shaft (18). The fusible support block (50) is embedded in the opening of the sealing ring (40) or the tightening ring (60). In a normal operating condition, the block prevents the ring, within which the block is located, from closing so as to ensure that the sealing ring (40) is in an open state, and when the plant is in an outage, the block is fused so to become ineffective such that the sealing ring (40) is closed under the action of the tightening ring (60). Further disclosed is a nuclear reactor coolant pump comprising this type of stopping seal assembly (30). This type of passive stopping seal assembly has only three components but is capable of satisfying the requirement of a complete shaft seal when the plant is in an outage without depending on an emergency shaft seal injection system, and has a simple structure and tight sealing.

IPC Classes  ?

• F04D 29/14 - Shaft sealings operative only when pump is inoperative