Nuclear power plant start and stop feed water pump

A technology for nuclear power plants and water supply pumps, which is applied to pumps, pump components, non-variable pumps, etc. It can solve the problems of long disassembly and assembly time, shorten maintenance time, increase erosion resistance, and stabilize working characteristics.

Active Publication Date: 2015-12-23
SHENYANG SANKE HYDRAULIC MACHINERY MANUFACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a nuclear power plant start-stop feedwater pump, which solves the problem of long disassembly and assembly time in the prior art, and improves the performance of the equipment

Method used

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  • Nuclear power plant start and stop feed water pump
  • Nuclear power plant start and stop feed water pump
  • Nuclear power plant start and stop feed water pump

Examples

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Embodiment

[0025] Such as figure 1 As shown, a double-casing horizontal multistage centrifugal pump is adopted, and the number of impeller stages is 6; it includes a cylinder body 15 and a core package, and the core package is integrated inside the cylinder body 15, and the cylinder body 15 and the end cover 16 pass through the stud 17 , nut 18 and washer 19 are fixed; clamping plate 11 and cylinder 15 are fixed by pins; The pump inlet and the pump outlet are arranged vertically upward; the overflow part of the cylinder is surfacing with an erosion-resistant Aussie stainless steel layer; the core package structure is that one end of the pump shaft 20 is provided with a mechanical seal I22 and a drive end Bearing assembly 21, the other end of pump shaft 20 is provided with mechanical seal II and free end bearing assembly 23; suction section 1, middle section, balance mechanism and pressure plate 14 are sequentially installed on pump shaft 20, suction section 1 and drive end bearing assemb...

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Abstract

The invention relates to a start-stop water feeding pump of a nuclear power station. The start-stop water feeding pump comprises a barrel body and a core bag which is entirely nested inside the barrel body, wherein the barrel body is in pipeline connection with an inlet and an outlet outside; a pump inlet and a pump outlet are perpendicularly distributed upwards; a structure of the core bag is that a mechanical seal I and a drive-end bearing component are arranged at one end of a pump shaft, and a mechanical seal II and a free-end bearing component are arranged at the other end of the pump shaft; and a suction section, a middle section, a balance mechanism and a press plate are sequentially mounted on the pump shaft, the suction section is connected with a bearing body of the drive-end bearing component, and the press plate is connected with a bearing body of the free-end bearing component. According to the start-stop water feeding pump of the nuclear power station, the maintenance time is substantially shortened, the support capacity and the service performance of equipment is greatly improved, the scour-resistant capacity is improved, the service life is prolonged, and the higher efficiency and the stable operating characteristic of the pump are guaranteed; a double-casing structure is adopted, namely, the pump is provided with two layers of press-bearing boundaries, so that the pressure-bearing reliability is doubled; and the safety of the pressure-bearing structures of the pump is ensured.

Description

technical field [0001] The invention relates to a feedwater pump, in particular to a nuclear power plant start-stop feedwater pump. Background technique [0002] The start-stop feed water pump is one of the main equipment of the start-stop water supply system of the PWR nuclear power plant. Its function is to provide auxiliary feed water to the secondary side of the steamer during the normal start-up and shutdown of the nuclear power plant. Whether the start-stop feedwater pump can work normally and safely will determine whether the nuclear power unit can be started and shut down for maintenance as planned. [0003] In the prior art, when the pump is installed, the impeller is mostly installed on the pump shaft first, the two ends of the impeller are respectively installed with sealing sleeves, the pump shaft is inserted into the pump body, and one end of the pump shaft is inserted into the pump cover. The pump cover is fixed on the pump body, and then the sealing structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D1/08F04D29/42
Inventor 胡小军张皙瑶刘长春
Owner SHENYANG SANKE HYDRAULIC MACHINERY MANUFACTORY
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