Axial force balance device for centrifugal residual heat removal pump for nuclear power

A waste heat discharge pump and balancing device technology, which is applied to components of pumping devices for elastic fluids, non-variable pumps, pumps, etc., can solve problems such as reducing efficiency and cavitation performance, and achieve improved pressure pulsation conditions, reduce the critical NPSH, and adjust the effect of small axial force

Active Publication Date: 2013-09-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of axial force balance device for the centrifugal waste heat discharge pump used in nuclear power, which solves the problems of reduced efficie

Method used

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  • Axial force balance device for centrifugal residual heat removal pump for nuclear power
  • Axial force balance device for centrifugal residual heat removal pump for nuclear power
  • Axial force balance device for centrifugal residual heat removal pump for nuclear power

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Embodiment Construction

[0017] combine figure 1 , using the radial return hole axial force balance device designed by the present invention, the shaft sleeve 4 is provided with a guide hole, the spline shaft 5 is connected to the impeller 1 through splines to form an axial return channel 10, and the liquid flow passes through the stop washer The radial return hole opened on 6 enters the impeller to form a radial return mode to adjust the axial force. The edge of the hub of impeller 1 is processed into a tooth-shaped groove, which constitutes a gear groove 11. A part of the liquid in the "gear groove" cavity is re-transported to the rear pump chamber between the pump cover 3 and the impeller 1 after being worked by the gear groove. Another part of the liquid enters the return channel 10 formed by the impeller hub 8 and the spline shaft 5 , and finally enters the impeller 1 through the radial return hole on the stop washer 6 .

[0018] combine figure 2 , the spline connection is adopted between the...

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Abstract

The invention discloses an axial force balance device for a centrifugal residual heat removal pump for nuclear power. The axial force balance device comprises an impeller (1), guide vanes (2), a pump cover (3), a shaft sleeve (4), a spline shaft (5), a locking gasket (6) and an impeller nut (7). Through radial flow return, pump efficiency is improved, critical net positive suction head of the pump is reduced and pressure fluctuation of an outlet of the impeller is improved effectively. Through impeller hub 'gear grooves', fluid leakage can be reduced greatly and pump efficiency is improved. The spline shaft is high in strength, centering performance of the impeller is fine, and accordingly vibration of the pump is controlled effectively. Through the special design of the locking gasket, impeller nut loosening is eliminated effectively, and axial force can be regulated to the minimum by changing area and number of balance holes.

Description

technical field [0001] The invention relates to a matching structure device of an impeller and a shaft, which is suitable for the axial force balance of the centrifugal impeller of hydraulic machinery, and especially refers to an axial force balance device of the centrifugal waste heat discharge pump for nuclear power in a radial return mode. Background technique [0002] The waste heat removal pump for mega-kilowatt nuclear power belongs to the nuclear secondary pump and is an important part of the waste heat removal system RRA of the primary circuit of the nuclear power plant. It is to remove the waste heat of the reactor and is one of the most critical nuclear power equipment. Since waste heat accounts for 2% to 3% of the total thermal power of the power station, the design and development of the hydraulic components of the waste heat discharge pump has become the biggest problem that restricts its localization. The structural form of the traditional waste heat discharge...

Claims

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Application Information

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IPC IPC(8): F04D29/22
Inventor 司乔瑞袁寿其张金凤裴吉冒杰云王文杰
Owner JIANGSU UNIV
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