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Impeller for residual heat removal pump

A technology for exhausting pumps and impellers of waste heat, applied to components, pumps, pump components, etc. of pumping devices used for elastic fluids, to achieve the effect of head reduction

Inactive Publication Date: 2013-06-19
SHANGHAI APOLLO MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure that the waste heat removal pump can continue to operate without damage, loss of function or reduction in head after the reactor coolant recovers without air inclusions, the anti-cavitation performance of the impeller must be guaranteed, and at the same time ensure that the impeller is in contact with the waste heat removal pump. After the shaft is socketed, the axial force on the pump shaft can be effectively balanced, but the current impeller cannot satisfy the above two functions at the same time

Method used

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  • Impeller for residual heat removal pump
  • Impeller for residual heat removal pump
  • Impeller for residual heat removal pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see figure 2 , in this embodiment, five blades 4 are arranged between the top surface of the front cover plate 1 of the impeller and the bottom surface of the rear cover plate 2, the blades 4 are curved into an arc shape, and arranged around the circumference of the hub 3 in the counterclockwise direction, and Extend to the edge of the rear cover 2. The blade 4 extends to the edge of the rear cover 2 in order to prevent the reactor coolant in the adjacent impeller flow channel 5 from colliding, resulting in cavitation of the impeller, and also to further ensure the stability of the impeller rotation center and further balance the pump shaft 100 Axial force. The blades 4 are bent into an arc and arranged counterclockwise around the circumference of the hub 3 so that the direction in which the blades 4 are arranged around the circumference of the hub 3 is opposite to the direction in which the pump shaft 100 rotates, reducing the hydraulic loss of the reactor coolant in...

Embodiment 2

[0026] see image 3 , In this embodiment, four blades 4 are arranged between the top surface of the front cover 1 and the bottom surface of the rear cover 2 of the impeller. The blades 4 are bent into an arc and arranged counterclockwise around the circumference of the hub 3 in order to make the direction in which the blades 4 are arranged around the circumference of the hub 3 opposite to the direction in which the pump shaft 100 rotates, reducing the hydraulic loss of the reactor coolant inside the impeller, further Enhance the anti-cavitation performance of the impeller and prolong the service life of the impeller. In this embodiment, the number of balanced through holes 21 is two, that is, the number N of vanes 4 is twice the number M of balanced through holes 21 . In this embodiment, compared with the impeller that does not set the balance through hole 21, but only extends the blade 4 to the edge of the rear cover plate 2, the cavitation of the impeller is greatly reduced...

Embodiment 3

[0028] see Figure 4 , In this embodiment, four blades 4 are arranged between the top surface of the front cover plate 1 and the bottom surface of the rear cover plate 2 of the impeller. The blades 4 are linear and arranged radially around the circumference of the hub 3 . In this embodiment, the number of balanced through holes 21 is four, that is, the number N of vanes 4 is twice the number M of balanced through holes 21 . In this embodiment, compared with the impeller that does not set the balance through hole 21, but only extends the blade 4 to the edge of the rear cover plate 2, the cavitation of the impeller is greatly reduced, and the service life is prolonged by 25%. The impeller with a balanced through hole 21 without extending the vane 4 to the edge of the rear cover 2, the axial force on the pump shaft 100 is significantly reduced, and the bearing (not shown) sleeved on the pump shaft 100 is effectively protected. The service life of the bearing was extended by 18%....

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Abstract

The invention discloses an impeller for a residual heat removal pump in the field of nuclear power equipment. The impeller for the residual heat removal pump comprises a front cover plate, a rear cover plate, and a hub which penetrates through the circle center of the rear cover plate, N pieces of vanes are evenly distributed on the periphery of hub between the bottom face of the rear cover plate and the top face of the front cover plate, an impeller passage is formed between any two adjacent vanes, M pieces of balancing holes are evenly distributed on the periphery of the hub between the vanes and the hub radial direction in the rear cover plate, and an impeller opening ring is sleeved on the front cover plate. The impeller for the residual heat removal pump has the advantages that anti-cavitation performance of the impeller is effectively improved, and service life is effectively prolonged. After the impeller is sleeved on a pump shaft of the residual heat removal pump, axial force which is exerted on the pump shaft is effectively balanced, and nonoccurrence of damage or function loss or lift reduction in a continuous operation process of the residual heat removal pump is guaranteed.

Description

technical field [0001] The invention relates to an impeller used for a waste heat discharge pump in the field of nuclear power equipment. Background technique [0002] The waste heat removal pump is a nuclear three-stage pump of a million-kilowatt nuclear power plant reactor. Its main function is to discharge the waste heat of the reactor coolant when the reactor is shut down, that is, the waste heat removal pump delivers the waste heat of the reactor coolant to the waste heat exchanger to meet The cooling requirements of nuclear power plants ensure the reliability and safety of nuclear power plant operation, and play an irreplaceable role in nuclear power plants. [0003] When the reactor coolant delivered by the waste heat removal pump enters the pump chamber of the waste heat removal pump, the reactor coolant contains air inclusions. Requirements for the waste heat removal pump: At the inlet of the pump cavity of the waste heat removal pump, when the content of air inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/22F04D29/24
Inventor 陆金琪
Owner SHANGHAI APOLLO MACHINERY
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