Waste heat discharge pump shaft cooling structure

Abstract

The invention discloses a waste heat discharge pump shaft cooling structure, which belongs to the technical field of a centrifugal pump. The waste heat discharge pump shaft cooling structure comprises a bearing box 1, a deep groove ball bearing 2, a cylindrical roller bearing 3, cooling water 4, lubricating oil 5, a cooling water pipeline 6, a cooling water jacket 7, a water inlet 71 and a water outlet 72. A spiral coil is processed and manufactured by using a forming technology including wind bending, roll bending, medium frequency induction heating bending and flame heating bending; and in order to enhance heat transfer, a phase change material is adopted. A single flow passage form is changed, a double cooling measure of the external water jacket and an internal cooling water path is taken, and the action of centrifugal force stressed by fluid in the spiral pipe is considered, so that the aim of enhancing the cooling effect of the waste heat discharge pump shaft is enhanced. The waste heat discharge pump shaft cooling structure has the advantages of simple structure, capability of obviously enhancing the waste heat discharge pump shaft cooling effect and no influence on operation efficiency of a pump.

Description

technical field [0001] The invention belongs to the technical field of centrifugal pumps, in particular to a device for enhancing the cooling effect of waste heat exhaust pump shafts. Background technique [0002] With the great development of domestic nuclear power and the deepening of the localization of nuclear power pumps, nuclear power pumps have been more in-depth research. The waste heat removal pump is an integral part of the waste heat removal system in the nuclear power plant. It is the only nuclear secondary pump arranged in the nuclear island except the nuclear main pump. It is the core equipment related to whether the nuclear island can shut down safely. When the reactor coolant pump is out of service, the waste heat discharge pump starts to operate, and the circuit water temperature directly reaches 180°C. The heat of the high-temperature water body in the pump is transferred to the bearing body of the pump, and the frictional heat generated by the high-speed r...

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Problems solved by technology

[0003] After searching, the patent applications related to the present invention include: a high-temperature front pump bearing body cooling device (notification number: CN201884334U), and a device for cooling the bearing body by using a spiral coil is invented, which is characterized by a simple structure, It has a certain cooling effect, but its cooling water circuit is arranged at one end of the shaft, which fails to make full use of the characteristics of fast heat conduction of the spiral coil, and the cooling effect is not ideal

[0004] Guide bearing oil temperature cooling structure (notice number: CN201982525U), this invention makes full use of the cooling water circuit and adds a cooling water jacket, but the cooling water jacket adopts a cylindrical annular water jacket, the water flows slowly, and the heat exchange effect is not good

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