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Auxiliary seal structure of wear-resistant, anti-friction and anti-radiation aging nuclear main pump mechanical seal

A technology of mechanical seals and secondary seals, which is applied to the components of pumping devices for elastic fluids, mechanical equipment, pumps, etc., and can solve problems such as O-ring peeling, wear and tear, mechanical seal leakage, and wear thinning. To achieve the effect of ensuring followability, ensuring reliability and high wear resistance

Active Publication Date: 2020-08-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1987, the failure analysis of the mechanical seal of the nuclear main pump used in the Indian nuclear power plant found that the double Δ channel sealing ring of PTFE composite material had serious extrusion deformation and wear and thinning, which caused the O-ring to peel and wear and damage, resulting in mechanical failure. Seal leaks

Method used

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  • Auxiliary seal structure of wear-resistant, anti-friction and anti-radiation aging nuclear main pump mechanical seal
  • Auxiliary seal structure of wear-resistant, anti-friction and anti-radiation aging nuclear main pump mechanical seal

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Such as figure 2 As shown, the auxiliary seal structure of the nuclear main pump mechanical seal with wear resistance, friction reduction and radiation aging resistance includes EPDM rubber O-ring (4) and polyarylether resin-based composite material double Δ channel seal ring (5) The auxiliary seal formed is matched with the martensitic precipitation hardening stainless steel shaft sleeve (1) with the shaft sleeve surface hardening layer (6), the EPDM rubber O-ring (4) and the polyarylether resin base composite Material The double Δ channel seal ring (5) is placed in the groove of the mechanical seal compensation ring seat (3), and the EPDM rubber O-ring (4) is squeezed by the mechanical seal compensation ring seat (3) to give polyarylether resin Sufficient pretightening force of the base composite material double Δ channel sealing ring (5), so that the surface of the shaft sleeve of the polyarylether resin base composite material double Δ channel sealing ring (5) and ...

Embodiment 2

[0019] Compared with the wear-resistant, anti-friction and anti-radiation aging nuclear main pump mechanical seal auxiliary seal structure disclosed in Example 1, the difference of this embodiment is that the polyarylether resin-based composite material double Δ channel sealing ring (5) The matrix is ​​polyether ketone resin, the solid lubricant is carbon nanotube, the content of carbon nanotube is 2.0wt.%, and it is prepared by thermoplastic molding.

[0020] The surface hardening layer (6) of the martensitic precipitation hardening stainless steel bushing (1) is a chromium carbonitride coating, and the chromium carbonitride coating is nanocrystalline Cr(C,N) / amorphous C(N) The composite structure, with a hardness of 25GPa and a thickness of 30μm, was deposited by high-power pulsed magnetron sputtering.

[0021]The double Δ channel sealing ring of polyether ketone composite material and the stainless steel shaft sleeve pair with chromium carbonitride coating are sealed. The f...

Embodiment 3

[0023] Compared with the wear-resistant, anti-friction and anti-radiation aging nuclear main pump mechanical seal auxiliary seal structure disclosed in Examples 1 and 2, the difference of this embodiment is that the polyarylether resin-based composite double Δ channel sealing ring ( 5) The matrix is ​​polyether ketone ketone resin, the solid lubricant is graphene, the content of graphene is 1.0wt.%, and it is prepared by thermoplastic molding.

[0024] The sleeve surface hardening layer (6) of the martensitic precipitation hardening stainless steel sleeve (1) is a nitriding layer with a N content of 30at.%, a hardness of 15GPa and a thickness of 30μm, prepared by plasma low temperature nitriding.

[0025] The double Δ channel sealing ring of polyether ketone ketone composite material and the stainless steel shaft sleeve pair with chromium carbonitride coating are sealed, and the friction coefficient is 0.007-0.022 in water with a temperature of 110°C, a pressure of 15.5MPa, and...

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Abstract

The invention relates to a wear resistant, friction reducing and radiation and aging resistant auxiliary sealing structure of a nuclear main pump mechanical seal, and belongs to the field of nuclear power equipment manufacturing. The auxiliary sealing structure comprises a ternary ethylene propylene rubber O-shaped ring, a double delta channel sealing ring and a shaft sleeve surface hardened layer. The rubber O-shaped ring and the double delta channel sealing ring constitute an auxiliary seal, and the double delta channel sealing ring and the shaft sleeve surface hardened layer constitute an auxiliary sealing matching pair. The double delta channel sealing ring is of polyaryl ether resin base composite materials, and a base body is separately of thermoplastic resin such as polyether-ether-ketone, polyether-ketone and polyether ketone ketone. A solid lubricant is separately of graphite, carbon nanotube and grapheme, and is prepared by adopting thermoplastic compression moulding forming.The auxiliary sealing matching pair is of a surface hardened layer such as a WC-Ni cemented carbide coating and a chromium carbonitride coating or a nitriding layer, and is prepared by adopting thermal spraying modified by intense current pulsed ion beam irradiation, high power pulsed magnetron sputtering deposition and plasma nitriding at low temperature. Stable low friction coefficient and high-wearing feature in water with high temperature, high pressure and high radioactivity are achieved, and tracing ability and reliability of a mechanical sealing system is improved.

Description

technical field [0001] The invention relates to a wear-resisting, friction-reducing and irradiation-aging-resistant mechanical seal auxiliary seal structure of a nuclear main pump, which belongs to the field of nuclear power equipment manufacturing. Background technique [0002] Nuclear power plant reactor coolant main circulation pump, referred to as the nuclear main pump, is the key continuous rotating equipment in the nuclear island. Steam, driving a steam turbine to generate electricity. The mechanical seal system of the nuclear main pump is composed of three sets of hydrostatic mechanical seals or hydrodynamic mechanical seals in series, which are used as a protective barrier for the reactor coolant system. Axial external leakage reduces the high temperature and high pressure conditions of the nuclear main pump system to ambient conditions through a controllable leakage rate to prevent the release of radioactive substances. [0003] The auxiliary seal between the seal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/12F04D29/04F04D29/02C23C28/00
CPCC23C28/34F04D29/026F04D29/04F04D29/126F05D2300/436F05D2300/509F05D2300/611
Inventor 雷明凯李昱鹏朱宝潘学民郭东明
Owner DALIAN UNIV OF TECH