CN103821757A - Dynamic pressure and static pressure mechanical seal combined type nuclear main pump gland seal system with parking sealing component - Google Patents
Dynamic pressure and static pressure mechanical seal combined type nuclear main pump gland seal system with parking sealing component Download PDFInfo
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- CN103821757A CN103821757A CN201410060888.8A CN201410060888A CN103821757A CN 103821757 A CN103821757 A CN 103821757A CN 201410060888 A CN201410060888 A CN 201410060888A CN 103821757 A CN103821757 A CN 103821757A
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Abstract
A dynamic pressure and static pressure mechanical seal combined type nuclear main pump gland seal system with a parking sealing component comprises a main shaft, a first-stage fluid dynamic pressure sealing component, a second-stage fluid dynamic pressure sealing component, a third-stage contact sealing static ring and a third-stage contact sealing dynamic ring. The three stages of mechanical sealing components are connected in series. The parking sealing component is installed above the third-stage contact mechanical sealing component. The first two stages of fluid dynamic pressure sealing components can both bear most of work loads and serve as mutual backups. Clear water is used by the third-stage contact mechanical sealing component as a sealing medium and can wash the surface of the sealing static ring, so that boron crystals are reduced. On the premise that certain redundancy is guaranteed, the economical efficiency is improved, and the defect that the third-stage fluid dynamic pressure mechanical sealing component of a reactor coolant pump with three stages of fluid dynamic pressure mechanical sealing components connected in series still discharges radiating media is overcome at the same time. Compared with the prior art, under the condition that the three stages of sealing components all lose efficacy, the parking sealing component located at the upper end is pushed by high pressure gas to be closed, it is guaranteed that radioactive media are not leaked outside, and therefore the operating reliability of the seal system is improved.
Description
Technical field
The present invention relates to reactor coolant pump mechanical seal device, be specifically related to have the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer.
Background technique
Reactor coolant pump, in core main pump, mechanical seal used is for controlling the leakage of reactor coolant along pump shaft, safety, the reliable operation of itself and reactor coolant pump are closely related.The main reactor coolant pump mechanical seal device using is three-stage mechanical seal in the world at present, can be divided into two large classes, one is Hydrostatic pressure type, and its structure is that first order employing hydrostatic pressure is contactless, second and third grade of employing contacting mechanical seal structure; Another kind is hydrodynamic formula, and its structure is three grades of hydrodynamic mechanical seals that all adopt same structure.
Hydrostatic pressure core main pump gland seal system, first order list conical surface hydrostatic seal bears most working pressures, when second level contacting mechanical seal is normally worked, although bear less pressure reduction, but owing to being operated in contact condition, so wearing and tearing are more serious, need timing to change or maintenance; Secondary contacting mechanical seal only, in the time that 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 formula core main pump gland seal system, adopts three grades of sealing cascaded structures equally, and by the dividing potential drop of choke coil, while making normally to work, less load is born in every grade of dynamic pressure sealing, has improved working life; Three grades of dynamic pressure sealings all can be born whole work loadss, and three grades backup each other, and have improved 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 designing, and some is many for redundancy.
Still leak the deficiency with radiating medium for core main pump static pressure gland seal system secondary contacting mechanical seal is easy to wear with the dynamic pressure gland seal system third level, Chinese patent CN101649834A " core main pump Hydrostatic, dynamic pressure combined type three-stage mechanical seal device " retaining on the basis of static pressure shaft seal first order hydrostatic profile non-contact mechanical seal and third level contacting mechanical seal, change secondary contacting mechanical seal into hydrodynamic (the sealing grooved that this patent shows is hot fluid dynamic pressure principle) non-contact mechanical seal, overcome on the one hand the wear problem of original contact seal, also can make the third level seal not to external leakage radiating medium simultaneously, and can remove the boron crystallization on third level seal face by injecting clear water.
All can not guarantee that three grades of sealings were all lost efficacy in active and static pressure combination shaft seal scheme described in static pressure shaft seal in above-mentioned shaft seal assembled scheme and Chinese patent CN101649834A time, radiating medium does not leak; And the sealing of one-level hydrostatic pressure is relative hydrodynamic seal antijamming capability working principle, and dynamics is poor.Three grades of tandem plans of existing dynamic pressure gland seal system, all can bear total head operating mode, because redundancy is more, are 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, in the time that three grades of sealings were all lost efficacy, guarantee that radioactivity freezing mixture does not leak, and has improved the service behaviour of sealing system; Improve Economy, can reduce the boron crystallization of third level sealing surface 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 water inlet 9, the work loads that two-stage hydrodynamic seal bears carries out dividing potential drop by the choke coil 11 being 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 faces by water inlet 8, part clear water flows out and mixes with second level hydrodynamic seal water leakage from stationary ring outside under pressure, 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 from stationary ring inner side.
Described first order hydrodynamic seal, second level hydrodynamic seal have two kinds of pressure-bearing modes: a kind of is the overwhelming majority that first order hydrodynamic seal bears work loads, and second level hydrodynamic seal is subject to fraction work loads; Another kind is that first order hydrodynamic seal, second level hydrodynamic seal on average bear most work loadss.
In the time that described first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were all lost efficacy, be positioned at high pressure air that the parking sealer of upper end injects at suction port 7 closed under driving, guarantee 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 the mechanical seal structure that designs.
Described third level contact seal is not limited to specific design proposal, comprises all sealing surface boron crystallization mechanical seal structures that also assurance can not be discharged containing radiating medium that are conducive to reduce.
Advantage of the present invention: 1) active and static pressure combination shaft seal scheme described in relatively existing three grades of gland seal systems of hydrostatic pressure reactor coolant pump and Chinese patent CN101649834A, increase parking sealer structure, can be in the time that three grades of sealings be all lost efficacy, guarantee that radioactivity freezing mixture does not leak, and has improved the service behaviour of sealing system; 2) adopt the relatively existing three grades of dynamic pressures sealing of two-stage hydrodynamic mechanical seal series shaft seal structure, can guarantee, under the prerequisite of certain redundancy, to improve Economy.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 series connection, 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 is the overwhelming majority that first order hydrodynamic seal bears work loads, second level hydrodynamic seal is subject to fraction work loads, another kind is that first order hydrodynamic seal, second level hydrodynamic seal on average bear most work loadss.High pressure sealing medium enters Seal cage by water inlet 9, two-stage dynamic pressure seals the work loads bearing and carries out dividing potential drop by the choke coil 11 being 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, in the time that first order hydrodynamic seal lost efficacy, second level hydrodynamic seal is all as backup, bear maximum working load, guarantee 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 faces by water inlet 8, part clear water flows out and mixes with second level hydrodynamic seal water leakage from stationary ring outside under pressure, 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 from stationary ring inner side.In the time that three-stage mechanical seal all lost efficacy, be positioned at high pressure air that the parking sealer of upper end injects at suction port 7 closed under driving, can guarantee 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 loadss.High pressure sealing medium enters Seal cage by water inlet 9, and two-stage dynamic pressure seals the work loads bearing and carries out dividing potential drop by the choke coil 11 being fixed on internal layer Seal cage 10.
In the time that 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, leak the slightly high clear water of end pressure than hydrodynamic seal and enter stationary seal ring 4 end faces by water inlet 8, part clear water flows out and mixes with second level hydrodynamic seal water leakage from stationary ring outside under pressure, 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 from stationary ring inner side.
In the time that first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were lost efficacy, be positioned at high pressure air that the parking sealer of upper end injects at suction port 7 closed under driving, can guarantee not leak with radiating medium.
Content described in this specification embodiment is only enumerating of way of realization to inventive concept; protection scope of the present invention should not be regarded as only limiting 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 (5)
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 water inlet (9), two-stage dynamic pressure seals the work loads bearing and carries out dividing potential drop by the choke coil (11) being 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 water inlet (8), part clear water flows out and mixes with second level hydrodynamic seal water leakage from stationary ring outside under pressure, 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 from stationary ring inner side.
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, second level hydrodynamic seal have two kinds of pressure-bearing modes: a kind of is the overwhelming majority that first order hydrodynamic seal bears work loads, and second level hydrodynamic seal is subject to fraction work loads; Another kind is that first order hydrodynamic seal, second level hydrodynamic seal on average bear most work loadss.
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: in the time that described first order hydrodynamic seal, second level hydrodynamic seal and third level contact seal were all lost efficacy, the parking sealer that is positioned at upper end is closed under the high pressure air of suction port (7) injection drives, and guarantees not leak with radiating medium.
4. 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 the mechanical seal structure that designs.
5. 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 sealing surface boron crystallization mechanical seal structures that also assurance can not be discharged containing radiating medium that are conducive to reduce.
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 |
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| 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 true CN103821757A (en) | 2014-05-28 |
| CN103821757B CN103821757B (en) | 2016-02-24 |
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Cited By (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 |
| CN105546120A (en) * | 2016-01-05 | 2016-05-04 | 西南石油大学 | Bilateral-pressurizing multilevel automatic starting and stopping mechanical seal device |
| WO2019161500A1 (en) * | 2018-02-21 | 2019-08-29 | Candu Energy Inc. | Nuclear coolant pump seal and methods of sealing |
| CN114526258A (en) * | 2022-01-21 | 2022-05-24 | 中密控股股份有限公司 | Three-stage series shaft seal device and nuclear main pump equipment |
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| 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 |
| JP2012241724A (en) * | 2011-05-16 | 2012-12-10 | Eagle Industry Co Ltd | Shutdown seal for mechanical seal |
| 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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2014
- 2014-02-21 CN CN201410060888.8A patent/CN103821757B/en active Active
Patent Citations (6)
| 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 |
| JP2012241724A (en) * | 2011-05-16 | 2012-12-10 | Eagle Industry Co Ltd | Shutdown seal for mechanical seal |
| 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 |
Cited By (6)
| 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 |
| CN105546120A (en) * | 2016-01-05 | 2016-05-04 | 西南石油大学 | Bilateral-pressurizing multilevel automatic starting and stopping mechanical seal device |
| WO2019161500A1 (en) * | 2018-02-21 | 2019-08-29 | Candu Energy Inc. | Nuclear coolant pump seal and methods of sealing |
| US11913465B2 (en) | 2018-02-21 | 2024-02-27 | Candu Energy Inc. | Nuclear coolant pump seal and methods of sealing |
| CN114526258A (en) * | 2022-01-21 | 2022-05-24 | 中密控股股份有限公司 | Three-stage series shaft seal device and nuclear main pump equipment |
| 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 |
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| CN103821757B (en) | 2016-02-24 |
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