Essential service water pump for nuclear power station

Abstract

The invention discloses an important factory water pump for a nuclear power station. Small grooves with different depths are arranged on the peripheral surface of a front sealing ring and a rear sealing ring of an impeller; the swing direction of each groove is opposite to the rotation direction of the impeller, so that the reflux quantity of liquid can be effectively reduced, and the volume efficiency of the pump is improved, thereby the purpose of the pump efficiency is achieved; a pump body is sealed by a packing seal device to be convenient and quick to overhaul and replace; a bearing is sealed by a lip-shaped skeleton sealing ring, and a lip thereof is outward and can effectively block a medium from entering a bearing body; a heat radiating fin is arranged on a bearing body at the position of a thrust bearing to increase the superficial area of the area, thereby effectively controlling the temperature of the bearing; a closing plate is additionally arranged at a window arranged on the bearing body for sealing to avoid the medium from entering a ball bearing; and meanwhile, a lip-shaped skeleton sealing ring is arranged on a pressure cover of an upper bearing to block the medium from entering the thrust bearing.

Description

technical field [0001] The invention relates to a pump, in particular to an important plant water pump used in nuclear power plants. Background technique [0002] The working medium of important factory water pumps used in nuclear power plants is sandy sea water. The main function of important plant water pumps in nuclear power plants is to transfer the liquid heat transferred from the equipment cooling water system to seawater, or to pump seawater to cool the equipment cooling water. As the ultimate heat sink of the nuclear island, its importance is self-evident. [0003] The existing important factory water pumps used in nuclear power plants also have the following defects: [0004] 1. The impeller seal ring and the pump body seal ring adopt a smooth gap seal, which cannot block the backflow of liquid and reduce the volumetric efficiency of the pump; [0005] 2. The pump body seal adopts mechanical seal, which is troublesome to replace and maintain; [0006] 3. There i...

AI Technical Summary

Problems solved by technology

[0004] 1. The impeller seal ring and the pump body seal ring adopt a smooth gap seal, which cannot block the backflow of liquid and reduce the volumetric efficiency of the pump;

[0005] 2. The pump body seal adopts mechanical seal, which is troublesome to replace and maintain;

[0006] 3. There is no cooling fin on the bearing body, especially where the bearing is installed, which makes the heat dissipation efficiency of the bearing low and affects the mechanical performance of the pump;

Images