CN103321949A - Seal ring friction pair for hydrodynamic mechanical seal of reactor coolant pump - Google Patents
Seal ring friction pair for hydrodynamic mechanical seal of reactor coolant pump Download PDFInfo
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- CN103321949A CN103321949A CN2013102844908A CN201310284490A CN103321949A CN 103321949 A CN103321949 A CN 103321949A CN 2013102844908 A CN2013102844908 A CN 2013102844908A CN 201310284490 A CN201310284490 A CN 201310284490A CN 103321949 A CN103321949 A CN 103321949A
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Abstract
The invention relates to a seal ring friction pair for a hydrodynamic mechanical seal of a reactor coolant pump. A stationary-ring slip ring (1) and a stationary-ring shrink ring (2) are thermally fitted to form a stationary part stationary-ring of the seal pair. A moving-ring shrink outer ring (3), a moving-ring slip ring (4) and a moving-ring shrink inner ring (5) are thermally fitted to form a rotating part moving-ring of the seal pair. The moving-ring shrink outer ring (4) is sleeved on the moving-ring slip ring (4), and the outer side of the moving-ring shrink inner ring (5) is in tight fit with the inner side of the moving-ring slip ring (4). A seal end face (6) of the stationary-ring slip ring (1) is evenly provided with nine special dynamic gradient-arc shallow grooves (7). A seal end face of the moving-ring slip ring (4) is a high-precision plane. The stationary-ring slip ring (1) is made of hard alloy, the moving-ring slip ring (4) is made of graphite, and both ends of the seal ring friction pair are ground finely. The seal ring friction pair has the advantages that the friction pair is extremely high in planarity and roughness, the seal is guaranteed in a fluid slip state during small-gap operation, and the service life of the seal is prolonged.
Description
Technical field: the present invention relates to reactor coolant pump hydrodynamic mechanical seal ring friction pair.
Background technique: shaft seal pump is widely used in the main coolant pump of pressurized-water reactor nuclear power plant all over the world.Reactor coolant pump is unique rotating equipment in nuclear power station one circuit system, and shaft sealing is the important rotary seal parts that reactor coolant is isolated from the outside in reactor coolant pump, abroad at last sect of examining the blockade of main pump art.By some grades of main shaft seals can be with high temperature, high pressure, be with active reactor medium to keep apart with the external world.The working life of main shaft seal, reliability are most important to the safe and stable operation of nuclear power station.The shaft sealing of using at present can be divided into hydrostatic pressure sealing and hydrodynamic seal two large classes.Because hydrodynamic mechanical seal factory in working life is reliable, so hydrodynamic mechanical seal more and more obtains tremendous development.
Since the nineties in last century, mapping, imitated, design studies reactor coolant pump shaft sealing are set about by the enterprise take former Shenyang Water Pump Factory as representative, research institute or colleges and universities.The reactor coolant pump of the companies such as Austrian ANDRITZ, German KSB is arranged with dynamic pressure type shaft sealing pattern, the reactor coolant pump hydrostatic profile shaft sealing of the companies such as U.S. EMD, Japanese MHI is arranged.Through capturing of 10 years of researches and key technology, obtained abundant achievement in fields such as raw material, structure, manufacturing and test method, but also truly be not used on the reactor coolant pump project so far.The friction pair shape of seal ring and manufacturing technology are especially crucial in Hydrodynamic pressure type mechanical seal, it determined sealing can be reliably, the long lifetime moves.
Summary of the invention: the purpose of this invention is to provide a kind of long service life, reactor coolant pump hydrodynamic mechanical seal ring friction pair that reliability is high.Technological scheme of the present invention is: a kind of reactor coolant pump hydrodynamic mechanical seal ring friction pair, by stationary ring slip ring (1), stationary ring shrink ring (2), rotating ring tightens outer shroud (3), rotating ring slip ring (4) and rotating ring tighten interior ring (5) and form, wherein stationary ring slip ring (1) and stationary ring shrink ring (2) hot charging have consisted of the stationary part stationary ring of sealing pair together, rotating ring tightens outer shroud (3), rotating ring slip ring (4) and rotating ring tighten interior ring (5) consists of sealing pair together through hot charging rotating part rotating ring, wherein rotating ring tightens outer shroud (3) and is sleeved on the rotating ring slip ring (4), rotating ring tightens the inner side surface of the outer side surface of interior ring (5) and rotating ring slip ring (4) for closely cooperating, have equably nine special dynamic pressure gradual change arc-shaped shallow slots (7) on the seal face (6) of stationary ring slip ring (1), the seal face of rotating ring slip ring (4) is high precision plane, stationary ring slip ring (1) is made by cemented carbide, rotating ring slip ring (4) adopts graphite to make, and the seal ring friction pair end face is all passed through meticulous grinding and made.
Working principle of the present invention and technological merit are:
1. be sealed under the working, the inner circle side (low pressure area) that seals among Fig. 1 is 5MPa with cylindrical side (zone of high pressure) pressure reduction, and special operation condition is issued to 15MPa.Relative with static components static when movable ring part is rotation, outer spring force of moving ring assembly and static components is close together, and prevents that medium from flowing from the zone of high pressure toward low pressure area.Moving ring assembly and static components have relative movement after the moving ring assembly rotation, medium is followed rotating ring and is flowed thereupon, (Fig. 2) interior dielectric of high-precision special gradual change arc-shaped shallow slot (7) is arranged on stationary ring slip ring (1) seal face this moment (6), according to the hydrodynamic principle, the melange effects such as centrifugal, the backflow of liquid occur in liquid in the gradual change arc-shaped shallow slot, rotating ring is separated with stationary ring.The sealing liquid film stiffness can increase rapidly along with reducing of running clearance of sealing when little gap, guarantees that sealing has enough opening forces and is unlikely to produce dry friction, and then has guaranteed the working life of sealing.
2. when running clearance surpasses certain limit, special gradual change arc-shaped shallow slot (7) can make the sealing liquid film stiffness reduce with the increase of running clearance, assurance and system pressure, spring force etc. make the balance between other power that short sealing surface closes, thereby the further expansion of control seal clearance, and then control seal leakage amount.
3. under the high voltage startup operating mode; the cooperation of other static seal ring recess size that the special gradual change arc-shaped shallow slot (7) by stationary ring slip ring (1) seal face and stationary ring are attached; thrust load in the time of can reducing stationary ring static; thereby improve the performance when being sealed in start and stop; avoid the wearing and tearing that play the stopping time of sealing pair, and then improve the working life of sealing.
4. the sealing surface of stationary ring slip ring (1) and rotating ring slip ring (4) has high planeness and roughness through grinding disposing, is in the fluid sliding mode when guaranteeing to be sealed in the operation of little gap, has guaranteed the working life of sealing.
5. pass through at stationary ring slip ring (1) and rotating ring slip ring (4), stationary ring shrink ring (2), rotating ring tighten outer shroud (3), rotating ring tightens the rigidity that interior ring (5) can increase sealing pair, reduce the injurious deformation that radial force that sealing pair produces because of system pressure difference causes.
6. grinding is all passed through at the slip surface of sealing pair and the back side, has very high planeness and parallelism, can make sealing pair be fitted in admirably rigidity preferably on the attached sealing support ring, thus issuable injurious deformation when further reducing the sealing pair operation.
Description of drawings:
Fig. 1 is the sealing pair sectional view
Fig. 2 is stationary ring slip surface view
Fig. 3 is stationary ring fluting schematic diagram
Fig. 4 is stationary ring slip ring grooved data sheet
Embodiment:
A kind of reactor coolant pump hydrodynamic mechanical seal ring friction pair as shown in Figure 1, by stationary ring slip ring 1, stationary ring shrink ring 2, rotating ring tightens outer shroud 3, rotating ring slip ring 4 and rotating ring tighten interior ring 5 and form, as shown in Figure 2, wherein stationary ring slip ring 1 and stationary ring shrink ring 2 hot chargings have consisted of the stationary part stationary ring of sealing pair together, rotating ring tightens outer shroud 3, rotating ring slip ring 4 and rotating ring tighten interior ring 5 consists of sealing pair together through hot charging rotating part rotating ring, wherein rotating ring tightens outer shroud 3 and is sleeved on the rotating ring slip ring 4, and rotating ring tightens the inner side surface of the outer side surface of interior ring 5 and rotating ring slip ring 4 for closely cooperating.As shown in Figure 4, have equably nine special dynamic pressure gradual change arc-shaped shallow slots 7 on the seal face 6 of stationary ring slip ring 1, its shape is the darkest 0.012mm of groove depth h, taper theta minimum minimum 0.0764 ° along the arc gradual change.The seal face of rotating ring slip ring 4 is high precision plane, and stationary ring slip ring 1 is made by cemented carbide, and rotating ring slip ring 4 adopts graphite to make, and the seal ring friction pair end face is all passed through meticulous grinding and made.
Claims (1)
1. reactor coolant pump hydrodynamic mechanical seal ring friction pair, it is characterized in that: by stationary ring slip ring (1), stationary ring shrink ring (2), rotating ring tightens outer shroud (3), rotating ring slip ring (4) and rotating ring tighten interior ring (5) and form, wherein stationary ring slip ring (1) and stationary ring shrink ring (2) hot charging have consisted of the stationary part stationary ring of sealing pair together, rotating ring tightens outer shroud (3), rotating ring slip ring (4) and rotating ring tighten interior ring (5) consists of sealing pair together through hot charging rotating part rotating ring, wherein rotating ring tightens outer shroud (3) and is sleeved on the rotating ring slip ring (4), rotating ring tightens the inner side surface of the outer side surface of interior ring (5) and rotating ring slip ring (4) for closely cooperating, have equably nine special dynamic pressure gradual change arc-shaped shallow slots (7) on the seal face (6) of stationary ring slip ring (1), the seal face of rotating ring slip ring (4) is high precision plane, stationary ring slip ring (1) is made by cemented carbide, rotating ring slip ring (4) adopts graphite to make, and the seal ring friction pair end face is all passed through meticulous grinding and made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310284490.8A CN103321949B (en) | 2013-07-09 | 2013-07-09 | Reactor coolant pump hydrodynamic mechanical seal ring friction pair |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310284490.8A CN103321949B (en) | 2013-07-09 | 2013-07-09 | Reactor coolant pump hydrodynamic mechanical seal ring friction pair |
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| CN103321949A true CN103321949A (en) | 2013-09-25 |
| CN103321949B CN103321949B (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310284490.8A Active CN103321949B (en) | 2013-07-09 | 2013-07-09 | Reactor coolant pump hydrodynamic mechanical seal ring friction pair |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952899A (en) * | 2016-06-29 | 2016-09-21 | 上海电气凯士比核电泵阀有限公司 | Fluid dynamic pressure type mechanical sealing face structure |
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| CN1074514A (en) * | 1992-11-13 | 1993-07-21 | 胜利石油管理局胜利采油厂 | Small discharge and high lift ground centrifugal pump |
| JPH07243536A (en) * | 1994-03-03 | 1995-09-19 | Hitachi Ltd | Floating ring seal |
| CN2830730Y (en) * | 2005-04-15 | 2006-10-25 | 江苏双达泵阀集团有限公司 | Fluid hydrodynamic mechanical seal |
| CN101825178A (en) * | 2010-03-26 | 2010-09-08 | 丹东克隆集团有限责任公司 | Lubricating mechanical sealing end surface for counter-current dynamical pressure groove |
| CN102032348A (en) * | 2010-12-10 | 2011-04-27 | 清华大学 | Mechanical seal ring with magnetic ring |
| CN102278482A (en) * | 2011-06-23 | 2011-12-14 | 北京化工大学 | Mechanical seal device with stress self adaption |
| CN102528613A (en) * | 2012-02-29 | 2012-07-04 | 大连理工大学 | Machining method for complex surface of fluid dynamic pressure and static pressure combined mechanical seal ring for nuclear main pump |
| CN102537360A (en) * | 2012-01-20 | 2012-07-04 | 重庆杜克高压密封件有限公司 | Assembled half-exposed framework high-pressure seal ring |
| CN203394842U (en) * | 2013-07-09 | 2014-01-15 | 哈尔滨电气动力装备有限公司 | Sealing ring friction pair for hydrodynamic mechanical seal of reactor coolant pump |
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2013
- 2013-07-09 CN CN201310284490.8A patent/CN103321949B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074514A (en) * | 1992-11-13 | 1993-07-21 | 胜利石油管理局胜利采油厂 | Small discharge and high lift ground centrifugal pump |
| JPH07243536A (en) * | 1994-03-03 | 1995-09-19 | Hitachi Ltd | Floating ring seal |
| CN2830730Y (en) * | 2005-04-15 | 2006-10-25 | 江苏双达泵阀集团有限公司 | Fluid hydrodynamic mechanical seal |
| CN101825178A (en) * | 2010-03-26 | 2010-09-08 | 丹东克隆集团有限责任公司 | Lubricating mechanical sealing end surface for counter-current dynamical pressure groove |
| CN102032348A (en) * | 2010-12-10 | 2011-04-27 | 清华大学 | Mechanical seal ring with magnetic ring |
| CN102278482A (en) * | 2011-06-23 | 2011-12-14 | 北京化工大学 | Mechanical seal device with stress self adaption |
| CN102537360A (en) * | 2012-01-20 | 2012-07-04 | 重庆杜克高压密封件有限公司 | Assembled half-exposed framework high-pressure seal ring |
| CN102528613A (en) * | 2012-02-29 | 2012-07-04 | 大连理工大学 | Machining method for complex surface of fluid dynamic pressure and static pressure combined mechanical seal ring for nuclear main pump |
| CN203394842U (en) * | 2013-07-09 | 2014-01-15 | 哈尔滨电气动力装备有限公司 | Sealing ring friction pair for hydrodynamic mechanical seal of reactor coolant pump |
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| Title |
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| 王玉明，黄伟峰，李永健: "核电站一回路用机械密封", 《摩擦学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952899A (en) * | 2016-06-29 | 2016-09-21 | 上海电气凯士比核电泵阀有限公司 | Fluid dynamic pressure type mechanical sealing face structure |
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| CN103321949B (en) | 2016-08-10 |
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