CN103821757B - There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer - Google Patents
There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer Download PDFInfo
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- CN103821757B CN103821757B CN201410060888.8A CN201410060888A CN103821757B CN 103821757 B CN103821757 B CN 103821757B CN 201410060888 A CN201410060888 A CN 201410060888A CN 103821757 B CN103821757 B CN 103821757B
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- mechanical seal
- hydrodynamic seal
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- 210000004907 gland Anatomy 0.000 title claims abstract description 18
- 230000003068 static effect Effects 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052796 boron Inorganic materials 0.000 claims abstract description 10
- 238000002425 crystallisation Methods 0.000 claims abstract description 10
- 230000008025 crystallization Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 abstract description 8
- 238000010523 cascade reaction Methods 0.000 abstract 1
- 230000002706 hydrostatic effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 239000000659 freezing mixture Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
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- Sealing Devices (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Mechanical Sealing (AREA)
Abstract
There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer, comprise main shaft, first order hydrodynamic seal assembly, second level hydrodynamic seal assembly, third level contact seal stationary ring and rotating ring, three-stage mechanical seal is connected, above third level contacting mechanical seal, parking sealer assembly is housed, front two-stage hydrodynamic seal all can bear most work load, backup each other, third level contacting mechanical seal adopts clear water as sealing medium, can rinse stationary seal ring surface, reduce boron crystallization, under the prerequisite ensureing certain redundancy, improve Economy, simultaneously, overcome the shortcoming that three grades of hydrodynamic mechanical seal cascade reaction reactor coolant pump third level still have radiating medium to discharge, hinge structure, when three grades of sealings were all lost efficacy, the parking sealer being positioned at upper end is closed under high pressure air promotes, ensure outwardly not leak the active medium of band, improve the functional reliability of sealing system.
Description
Technical field
The present invention relates to reactor coolant pump mechanical seal device, be specifically related to the active and static pressure mechanical seal combined nuclear main pump gland seal system with parking sealer.
Background technique
Reactor coolant pump, namely in core main pump, mechanical seal used is used to control reactor coolant along the leakage of pump shaft, and safety, the reliable operation of itself and reactor coolant pump are closely related.The main reactor coolant pump mechanical seal device used is three-stage mechanical seal in the world at present, two large classes can be divided into, one is hydrostatic, and its structure is that first order employing hydrostatic pressure is contactless, second and third grade adopts contacting mechanical seal structure; Another kind is hydrodynamic, and its structure is three grades of hydrodynamic mechanical seals all adopting same structure.
Hydrostatic pressure core main pump gland seal system, first order list conical surface hydrostatic seal bears most work pressure, when second level contacting mechanical seal normally works, although bear less pressure reduction, but owing to being operated in contact condition, so wearing and tearing are relatively more serious, need timing to change or maintenance; The mechanical seal of Secondary contact formula only when one-level hydrostatic seal lost efficacy, change into the non-contact mechanical seal with tapering, but leakage rate is larger by the resiliently deformable of rotating ring.
Hydrodynamic core main pump gland seal system, same employing three grades sealing cascaded structures, by the dividing potential drop of choke coil, when making normally to work, less load is born in every grade of dynamic pressure sealing, improves working life; Three grades of dynamic pressure sealings all can bear whole work loadss, and three grades backup each other, and improve the reliability of work.But the leakage of the dynamic pressure type gland seal system third level is with certain radioactive medium.In addition, three grades of dynamic pressure series connection backups are from design, and some is many for redundancy.
The deficiency with radiating medium is still leaked for the easy to wear and dynamic pressure gland seal system third level of core main pump static pressure gland seal system Secondary contact formula mechanical seal, Chinese patent CN101649834A " core main pump Hydrostatic, dynamic pressure combined type three-stage mechanical seal device " on the basis retaining static pressure shaft seal first order hydrostatic profile non-contact mechanical seal and third level contacting mechanical seal, the mechanical seal of Secondary contact formula is changed into hydrodynamic (the sealing grooved of this patent display is hot fluid dynamic pressure principle) non-contact mechanical seal, overcome the wear problem of original contact seal on the one hand, also the third level can be made to seal not to external leakage radiating medium simultaneously, and remove the boron crystallization on third level seal face by injected clear water.
When all can not ensure that three grades of sealings were all lost efficacy in active and static pressure combination shaft seal scheme described in the static pressure shaft seal in above-mentioned shaft seal assembled scheme and Chinese patent CN101649834A, radiating medium does not leak; And the sealing of one-level hydrostatic pressure is from fluid relative dynamic pressure sealing antijamming capability working principle, namely dynamics is poor.Existing dynamic pressure gland seal system thtee-stage shiplock scheme, all can bear total head operating mode, because redundancy is more, is not optimum scheme economically.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide the active and static pressure mechanical seal combined nuclear main pump gland seal system with parking sealer, when three grades of sealings were all lost efficacy, ensured that radioactivity freezing mixture did not leak, improved the service behaviour of sealing system; Improve Economy, the boron crystallization of third level sealing surface can be reduced simultaneously.
In order to achieve the above object, the technological scheme that the present invention takes is:
There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer, comprise main shaft 1, first order hydrodynamic seal assembly 2, second level hydrodynamic seal assembly 3, third level contact seal stationary ring 4 and rotating ring 5, first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal series connection, above third level contact seal, parking sealer assembly 6 is housed, high pressure sealing medium enters Seal cage by the second water inlet 9, the work loads that two-stage hydrodynamic seal bears carries out dividing potential drop by the choke coil 11 be fixed on internal layer Seal cage 10, first order hydrodynamic seal, the design load of second level hydrodynamic seal is maximum working load, third level contact seal adopts clean water sealing, the clear water higher than second grade fluid dynamic pressure seal leakage end pressure enters stationary seal ring 4 end face by the first water inlet 8, part clear water flows out under pressure and mixes with second level hydrodynamic seal water leakage outside stationary ring, this leakage flow rinses stationary ring sealing surfaces, reduce boron crystallization, then entering appearance system, another part clear water directly flows out to atmospheric side inside stationary ring.
Described first order hydrodynamic seal, second level hydrodynamic seal have two kinds of pressure-bearing modes: a kind of overwhelming majority being first order hydrodynamic seal and bearing work loads, and second level hydrodynamic seal is by fraction work loads; Another kind is first order hydrodynamic seal, second level hydrodynamic seal on average bears most work load.
When described first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were all lost efficacy, the parking sealer being positioned at upper end was closed under the high pressure air that suction port 7 injects drives, and ensured not leak with radiating medium.
Described first order hydrodynamic seal assembly 2, second level hydrodynamic seal assembly 3 are not limited to specific design proposal, comprise all utilization hydrodynamic principles and carry out the mechanical seal structure that designs.
Described third level contact seal is not limited to specific design proposal, comprises all mechanical seal structures being conducive to the crystallization of reduction sealing surface boron and also ensureing can not discharge containing radiating medium.
Advantage of the present invention: 1) relatively have active and static pressure combination shaft seal scheme described in hydrostatic pressure reactor coolant pump three grades of gland seal systems and Chinese patent CN101649834A, add parking sealer structure, can when three grades of sealings be all lost efficacy, ensure that radioactivity freezing mixture does not leak, improve the service behaviour of sealing system; 2) adopt two-stage hydrodynamic mechanical seal relatively existing three grades of dynamic pressures sealing series shaft seal structure, under the prerequisite ensureing certain redundancy, Economy can be improved.3) shortcoming that the reactor coolant pump third level that the third level adopts contacting mechanical seal can overcome existing three grades of hydrodynamic mechanical seals series connection still has radiating medium to discharge, can reduce the boron crystallization of third level sealing surface simultaneously.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to accompanying drawing, there is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer, comprise main shaft 1, first order hydrodynamic seal assembly 2, second level hydrodynamic seal assembly 3, third level contact seal stationary ring 4 and rotating ring 5, three-stage mechanical seal is connected, above third level mechanical seal, parking sealer assembly 6 is housed, described first order hydrodynamic seal, second level hydrodynamic seal has two kinds of pressure-bearing modes: a kind of overwhelming majority being first order hydrodynamic seal and bearing work loads, second level hydrodynamic seal is by fraction work loads, another kind is first order hydrodynamic seal, second level hydrodynamic seal on average bears most work load.High pressure sealing medium enters Seal cage by the second water inlet 9, two-stage dynamic pressure seals the work loads born and carries out dividing potential drop by the choke coil 11 be fixed on internal layer Seal cage 10, the design load of two-stage hydrodynamic seal is maximum working load, therefore, no matter adopt above-mentioned that dividing potential drop working method, when first order hydrodynamic seal lost efficacy, second level hydrodynamic seal was all as backup, bear maximum working load, ensure the reliability of gland seal system.Third level contact seal adopts clean water sealing, the clear water higher than secondary dynamic pressure seal leakage end pressure enters stationary seal ring 4 end face by the first water inlet 8, part clear water flows out under pressure and mixes with second level hydrodynamic seal water leakage outside stationary ring, this leakage flow can rinse stationary ring sealing surfaces, reduce boron crystallization, then entering appearance system; Another part clear water directly flows out to atmospheric side inside stationary ring.When three-stage mechanical seal all lost efficacy, the parking sealer being positioned at upper end was closed under the high pressure air that suction port 7 injects drives, and can ensure to be with active medium not leak.
Working principle of the present invention:
Under two-stage hydrodynamic seal normal working, have two kinds of pressure-bearing modes: first order hydrodynamic seal bears the overwhelming majority of work loads, second level hydrodynamic seal bears fraction work loads; First order hydrodynamic seal, second level hydrodynamic seal can on average bear most work load.High pressure sealing medium enters Seal cage by the second water inlet 9, and two-stage dynamic pressure seals the work loads born and carries out dividing potential drop by the choke coil 11 be fixed on internal layer Seal cage 10.
When first order hydrodynamic seal lost efficacy, because the design load of two-stage hydrodynamic seal is maximum working load, so no matter adopt above-mentioned that dividing potential drop working method, second level hydrodynamic seal all as backup, bears maximum working load.
Third level contact seal adopts clean water sealing, the clear water leaking end pressure slightly high than hydrodynamic seal enters stationary seal ring 4 end face by the first water inlet 8, part clear water flows out under pressure and mixes with second level hydrodynamic seal water leakage outside stationary ring, this leakage flow can rinse stationary ring sealing surfaces, reduce boron crystallization, then entering appearance system; Another part clear water directly flows out to atmospheric side inside stationary ring.
When first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were lost efficacy, the parking sealer being positioned at upper end was closed under the high pressure air that suction port 7 injects drives, and can ensure not leak with radiating medium.
Content described in this specification embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment states, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (3)
1. there is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer, comprise main shaft (1), first order hydrodynamic seal assembly (2), second level hydrodynamic seal assembly (3), third level contact seal stationary ring (4) and rotating ring (5), it is characterized in that: first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal series connection, above third level contact seal, parking sealer assembly (6) is housed, high pressure sealing medium enters Seal cage by the second water inlet (9), two-stage dynamic pressure seals the work loads born and carries out dividing potential drop by the choke coil (11) be fixed on internal layer Seal cage (10), first order hydrodynamic seal, the design load of second level hydrodynamic seal is maximum working load, third level contact seal adopts clean water sealing, the clear water higher than second grade fluid dynamic pressure seal leakage end pressure enters stationary seal ring (4) end face by the first water inlet (8), part clear water flows out under pressure and mixes with second level hydrodynamic seal water leakage outside stationary ring, this leakage flow rinses stationary ring sealing surfaces, reduce boron crystallization, then entering appearance system, another part clear water directly flows out to atmospheric side inside stationary ring,
Described first order hydrodynamic seal, second level hydrodynamic seal have two kinds of pressure-bearing modes: a kind of overwhelming majority being first order hydrodynamic seal and bearing work loads, and second level hydrodynamic seal is by fraction work loads; Another kind is first order hydrodynamic seal, second level hydrodynamic seal on average bears most work load;
When described first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were all lost efficacy, the parking sealer being positioned at upper end is closed under the high pressure air that suction port (7) injects drives, and ensures not leak with radiating medium.
2. the active and static pressure mechanical seal combined nuclear main pump gland seal system with parking sealer according to claim 1, it is characterized in that: described first order hydrodynamic seal assembly (2), second level hydrodynamic seal assembly (3) are not limited to specific design proposal, comprise all utilization hydrodynamic principles and carry out the mechanical seal structure that designs.
3. the active and static pressure mechanical seal combined nuclear main pump gland seal system with parking sealer according to claim 1, it is characterized in that: described third level contact seal is not limited to specific design proposal, comprise all mechanical seal structures being conducive to the crystallization of reduction sealing surface boron and also ensureing can not discharge containing radiating medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410060888.8A CN103821757B (en) | 2014-02-21 | 2014-02-21 | There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410060888.8A CN103821757B (en) | 2014-02-21 | 2014-02-21 | There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer |
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| CN103821757A CN103821757A (en) | 2014-05-28 |
| CN103821757B true CN103821757B (en) | 2016-02-24 |
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| CN201410060888.8A Active CN103821757B (en) | 2014-02-21 | 2014-02-21 | There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879305A (en) * | 2015-05-28 | 2015-09-02 | 国网湖北省电力公司咸宁供电公司 | Water pump with dynamic seal for power plant |
| CN105546120B (en) * | 2016-01-05 | 2017-06-27 | 西南石油大学 | A kind of bilateral pressurising multistage automatic start-stop mechanically-sealing apparatus |
| EP3756199A4 (en) * | 2018-02-21 | 2021-12-08 | Candu Energy Inc. | Nuclear coolant pump seal and methods of sealing |
| CN114526258B (en) * | 2022-01-21 | 2024-04-02 | 中密控股股份有限公司 | Three-stage series shaft seal device and nuclear main pump equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB817265A (en) * | 1956-09-19 | 1959-07-29 | Westinghouse Electric Int Co | Improvements in or relating to nuclear reactors |
| CN101649834A (en) * | 2009-09-08 | 2010-02-17 | 合肥通用机械研究院 | Hydrostatic and hydrodynamic combined type three-stage mechanical seal device for nuclear main pump |
| RU2418197C1 (en) * | 2009-09-25 | 2011-05-10 | Открытое акционерное общество "Центральное конструкторское бюро машиностроения" | Primary circulation pump unit |
| CN103256246A (en) * | 2013-05-22 | 2013-08-21 | 哈尔滨电气动力装备有限公司 | Fluid-dynamic-pressure three-level mechanical sealing device for reactor coolant pump |
| CN203730390U (en) * | 2014-02-21 | 2014-07-23 | 清华大学 | Dynamic-pressure and static-pressure mechanical sealing combined type nuclear main pump shaft seal device with parking sealing function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5586525B2 (en) * | 2011-05-16 | 2014-09-10 | イーグル工業株式会社 | Shutdown seal for mechanical seal |
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2014
- 2014-02-21 CN CN201410060888.8A patent/CN103821757B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB817265A (en) * | 1956-09-19 | 1959-07-29 | Westinghouse Electric Int Co | Improvements in or relating to nuclear reactors |
| CN101649834A (en) * | 2009-09-08 | 2010-02-17 | 合肥通用机械研究院 | Hydrostatic and hydrodynamic combined type three-stage mechanical seal device for nuclear main pump |
| RU2418197C1 (en) * | 2009-09-25 | 2011-05-10 | Открытое акционерное общество "Центральное конструкторское бюро машиностроения" | Primary circulation pump unit |
| CN103256246A (en) * | 2013-05-22 | 2013-08-21 | 哈尔滨电气动力装备有限公司 | Fluid-dynamic-pressure three-level mechanical sealing device for reactor coolant pump |
| CN203730390U (en) * | 2014-02-21 | 2014-07-23 | 清华大学 | Dynamic-pressure and static-pressure mechanical sealing combined type nuclear main pump shaft seal device with parking sealing function |
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| CN103821757A (en) | 2014-05-28 |
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