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Flow backing device of nuclear power centrifugation type excess heat discharge pump

A technology of waste heat discharge pump and return device, which is applied to the components of pumping device for elastic fluid, non-variable-capacity pump, pump, etc., can solve the water flow disorder at the impeller inlet, destroy the flow state, reduce the pump life, etc. problems, to achieve the effect of improving water flow turbulence, improving performance, and improving efficiency

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

The traditional axial force balance device of the pump is usually used, that is, when the balance hole is set on the impeller, the return flow direction of the liquid through the balance hole of the impeller is opposite to the flow direction of the impeller, which destroys the normal flow state and causes the water flow at the impeller inlet to be disordered. reduce pump efficiency
The return vortex will induce vibration and noise, and cause vortex cavitation, damage the flow-through parts, and reduce the life of the pump

Method used

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  • Flow backing device of nuclear power centrifugation type excess heat discharge pump
  • Flow backing device of nuclear power centrifugation type excess heat discharge pump
  • Flow backing device of nuclear power centrifugation type excess heat discharge pump

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The waste heat discharge pump reflux device designed by the present invention, such as figure 1 As shown, on the front cover 1 and the pump body 3, five return holes 2 and 8 are evenly opened in the circumferential direction, respectively, and are fixedly connected with the two ends of the return pipeline 9, as shown in FIG. figure 2 shown. The area of ​​the return hole is 6 times the area of ​​the gap between the back ring 7 of the impeller and the pump body 3, the distance between the cross section of the pipe where the five return holes 2 are located is 0.8 times the diameter of the impeller inlet in the axial direction, and the diameter of the center line of the five return holes 8 Be 0.55 times the inner diameter of the impeller front mouth ring 12. The return holes 2 and 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =72°. The liquid flow enters the rear pump cavity from the outlet of the impe...

Embodiment 2

[0021] On the front cover 1 and the pump body 3, eight return holes 2 and 8 are evenly opened in the circumferential direction, respectively, and are fixedly connected with the two ends of the return pipeline 9, such as figure 2 shown. The area of ​​the return hole is 9 times the gap area between the impeller back ring 7 and the pump body 3, the distance between the section of the pipe where the 8 return holes 2 are located is 1.2 times the diameter of the impeller inlet in the axial direction, and the diameter of the center line of the 8 return holes 8 It is the inner diameter of 0.65 times of impeller front mouth ring 12. The return holes 2 and 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =45°. The liquid flow enters the rear pump cavity from the outlet of the impeller 5, flows through the return hole 8 on the pump body, flows through the return line 9, reaches the return hole 2 of the front cover 1, and...

Embodiment 3

[0023] On the front cover 1 and the pump body 3, six return holes 2 and 8 are evenly opened in the circumferential direction, respectively, and are fixedly connected with the two ends of the return pipeline 9, such as figure 2 shown. The area of ​​the return hole is 7 times of the gap area between the impeller back ring 7 and the pump body 3, the distance of the pipe section where the 6 return holes 2 are located is 1.0 times the diameter of the impeller inlet in the axial direction from the impeller inlet, and the diameter of the center line of the 6 return holes 8 It is the internal diameter of 0.6 times of impeller front mouth ring 12. The return holes 2 and 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =60°, such as image 3 shown. The liquid flow enters the rear pump cavity from the outlet of the impeller 5, flows through the return hole 8 on the pump body, flows through the return line 9, reaches the ...

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Abstract

The invention discloses a flow backing device of a nuclear power centrifugation type excess heat discharge pump. By means of a mode of backflow formed by a flow backing hole (2) opened on a front cover (1), a flow backing hole (8) opened on a pump body (3) and a flow backing pipeline (9), the problem of flow turbulence at the position of an impeller inlet caused by the fact that a liquid flow backing direction and an impeller incoming flow direction are opposite due to traditional impeller equalizing orifices is solved, so that the efficiency of the pump is improved, the critical net positive suction head of the pump is reduced, conditions of pressure pulsation at the position of an impeller outlet can be effectively improved, and optimal effects of improving performances are achieved by changing the position, size and number of the opened flow backing holes.

Description

technical field [0001] The invention relates to a nuclear power centrifugal waste heat discharge pump, in particular to a return device. Background technique [0002] The waste heat removal pump for mega-kilowatt nuclear power is a nuclear secondary pump, which is an important part of the waste heat removal system RRA of the primary circuit of the nuclear power plant. Its function is to remove the waste heat of the reactor and is one of the most critical nuclear power equipment. Since waste heat accounts for 2-3% of the total thermal power of the power station, the design and development of the hydraulic components of the waste heat removal pump has become the biggest problem that restricts its localization. The structural form of the traditional waste heat discharge pump is a horizontal, single-stage, single-suction, rear-opening centrifugal pump, supported by the center line. The pump adopts a horizontal suction and vertical upward discharge structure, and the rotor is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44
Inventor 张金凤张云蕾袁寿其袁建平王文杰冒杰云
Owner JIANGSU UNIV
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