CN102155431B - Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump - Google Patents
Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump Download PDFInfo
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- CN102155431B CN102155431B CN2011100920058A CN201110092005A CN102155431B CN 102155431 B CN102155431 B CN 102155431B CN 2011100920058 A CN2011100920058 A CN 2011100920058A CN 201110092005 A CN201110092005 A CN 201110092005A CN 102155431 B CN102155431 B CN 102155431B
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Abstract
The invention relates to a wedge groove curvature sealing structure for dynamic and static gaps for a nuclear main pump. A static component of a nuclear main pump is provided with a sealing ring; the inner surface of the sealing ring is provided with a curvature sealing groove; the sealing groove is arranged at the inner surface of the sealing ring according to the opposite direction of the rotation of a rotor; a rotary component rotates to drive a fluid to rotate; and a working medium enters the curvature sealing groove, flowing which is opposite to the direction of a leakage flow is formed, the fluid forms the pressure resistance at the inlet of the sealing groove to block the leakage flow. The nuclear main pump provided by the invention is used under the condition of a high-pressure high-temperature high-speed large flow rate working condition, leakage flow rate can be controlled steadily and temporarily under a backflow extreme working condition, and is safe, durable and has a good leakage control effect.
Description
Technical field
The application belongs to the non-contact technical field of sealing technology, relates to a kind of wedge groove camber line sealing configuration of examining main pump with dynamic and static gaps.
Background technique
The noncontact seal technology is applied to the rotary component of control pump and the dielectric leakage in static part gap.The sealing of flow resistance type is a kind of of noncontact seal, and the fluid resistance that relies on the difformity seal clearance to produce reduces leakage rate.When sealed inside is liquid refrigerant; The throttling hypotensive effect that relies on the interior whirlpool dissipation of sealing runner to produce crushing and narrow gap reduces the leak pressure of internal flow; But this kind pressure reduction effect is only effective to the high reynolds number liquid airproof; And under low reynolds number (Re＜400～500), narrow gap can reduce flow resistance.Hydrodynamic reverse pumping type more is applicable to liquid refrigerant, and it relies on rotatable member to produce the reverse pressure head prevention of the leakage flow that acts on medium medium to external leakage.
The normal little clearance seal of level and smooth dynamic and static ring that adopts of nuclear main pump dynamic and static gaps between impeller outlet and stator dynamic and static gaps and impeller eye wheel cap place and import honeycomb duct; The whirlpool dissipation and the throttling step-down of this kind sealed inside medium are not obvious; The control leakage effect is poor; And the wedge groove of the application's sealing configuration produces the pumping pressure head bigger than rising as high as the banks to the sealing inner fluid, and this pumping pressure head and seal leakage pressure in contrast stop the leakage of sealing medium; The more important thing is that the clearance seal of pump especially examines the clearance seal of main pump, should consider this extreme operating condition that flows backwards, even the application's sealing configuration under the situation of parts counter-rotating, still can effectively be controlled reverse leakage flow in the nuclear main pump.
Summary of the invention
The technical problem that the application will solve provides a kind of wedge groove camber line sealing configuration of examining main pump with dynamic and static gaps; The effectively leakage of control incompressible fluid; Guarantee stable operation under the working medium of big flow, even under the refluence extreme operating condition, also can keep the stable of leakage rate, long service life.
The technological scheme that the application adopts is:
A kind of nuclear main pump is with wedge groove camber line sealing configuration; On the rotating machinery static part seal ring is housed; Seal ring internal surface intermediate portion is provided with the camber line seal groove of rectangle; Seal groove is arranged at the seal ring internal surface by the opposite direction of rotor rotation, and the seal groove bottom surface is the scarf of low depth import to high degree of depth outlet transition; Seal groove import sidewall with axially become 30 °～75 ° angles; Medial axis, seal groove bottom surface and circumference tangent plane angle can be 1 °～10 °, and seal groove is imported and exported the base and circumferencial direction tangent line angle can be-30 °～30 °.The seal groove inlet face is 5%～20% of a seal ring axial length apart from the seal ring inlet face, and the seal groove exit face is 5%～20% of a seal ring axial length apart from the seal ring exit face; Per 5 °～15 ° are provided with a seal groove, and the seal groove width can be 2 °～7 °.
Because the viscous force effect of medium, the rotor rotation drives the fluid rotation, and working medium gets into the camber line seal groove; Form with leakage flow is rightabout and flow; This part fluid is obstructed in seal groove inlet and forms the high pressure endless belt, and the pressure head of endless belt has reduced the pressure head of leakage flow, has hindered flowing of leakage flow.
The camber line seal groove is arranged on the seal ring intermediate portion, and therefore the import and export boss of sealing forms the dam, and camber line seal groove intermediate projections partly forms boss.Seal boss is arranged at the seal ring internal surface by the opposite direction of rotor rotation, utilizes the impeller rotary component to drive the part medium along the reverse flow of camber line sealed chamber, hinders leakage flow, with the control leakage rate; Along with the increase of rotating speed, this resistance can be all the more obvious, and the leakage flow resistance helps gaining.In addition, the camber line seal groove structure can stop the leakage rate of two direction incoming flows, under the extreme operating condition that flows backwards, if the rotary component counter-rotating also can form retrograde fluid and suppress leakage flow.
Leakage flow flows into arc trajectory in the camber line seal groove, the leakage flow flow path is longer than common labyrinth seal, and this has just increased the waiting time of leakage flow in Seal cage; Increased linear loss; Working medium produces more multipotency dissipation in camber line flows, kinetic energy is converted into heat energy, and pressure can reduce gradually; The pressure head of leakage flow lowers, and is of value to the control leakage flow.
The import and export area that the dam of the import and export of sealing reduces to seal increases the leakage flow flow resistance, and the inlet of seal groove produces high pressure zone simultaneously, has reduced leakage flow.
The seal groove scarf helps drawing the part medium with axial angle and forms with leakage flow rightabout mobile; This structure increases the pumping effect; Form high pressure zone in seal groove inlet; Seal groove bottom surface and circumference tangential angle help widening high pressure zone, to reduce the pressure head of leakage flow, have hindered flowing of leakage flow.
The narrow gap of sealing inducer can increase the leak fluid resistance, is of value to the throttling of working medium simultaneously, forms high-velocity fluid, makes it in seal groove, convert heat energy into by kinetic energy, carries out energy dissipation, reduces the pressure ability, reduces to leak pressure head.
Whenever on the circumference, a camber line seal groove is set at a distance from 5 °～15 °, seal groove should not be overstocked, otherwise flow resistance reduces; Seal groove should not be thin excessively, otherwise the pumping effect is not strong.
The seal boss of sealing configuration can suitably shorten the tooth Elongation under the condition of limited of space, to adapt to high pressure, high-velocity fluid, prevent the fracture of seal boss root, increases its working life, prolongs the repair cycle, guarantees Security.
The application's beneficial effect is:
(1) the application's sealing configuration has the better controlling leakage effect.The impeller rotary component drives the part medium along the reverse flow of camber line sealed chamber, produces the pumping pressure head, forms high pressure zone in the seal groove entry zone simultaneously and stops leakage flow.This kind form control incompressible fluid leakage ability is superior to relying on the labyrinth seal of dissipation of vorticity kinetic energy.Through numerical simulation study, the application's sealing reduces 30% leakage rate than identical gap and the sealing of equal length pumping hole ring.
(2) the application's sealing configuration has the excellent energy dissipative effect.The increase of seal groove camber line angle is of value to the active force that increases seal groove and fluid, and the pumping effect of camber line seal groove can be strengthened, and flows into arc trajectory; Its path is longer than common labyrinth seal; Increased flow resistance, increased linear loss, working medium produces more multipotency dissipation in camber line flows; The pressure head of leakage flow lowers, and is of value to the control leakage flow.
(3) the application's sealing configuration has good flow resistance.The camber line seal groove is arranged on the seal ring intermediate portion; The part medium counter flow concentrates on the seal groove import, forms high pressure zone herein and hinders leakage flow, and the dam of the import and export of sealing reduces the import and export area of medium simultaneously; Increase the leakage flow flow resistance, reduce leakage flow.
(4) the seal groove scarf helps drawing the part medium in axial angle and forms with leakage flow is rightabout and flow, and this structure increases pumping effect, and circumference tangential, seal groove bottom surface angle helps widening high pressure zone, has hindered flowing of leakage flow.
(5) the application seals the leakage rate that the camber line structure can stop two direction incoming flows, and under the extreme operating condition that flows backwards, if the impeller counter-rotating, i.e. rotary component counter-rotating forms retrograde fluid and suppresses leakage flow, has played the effect of stable refluence leakage flow.
(6) the application is provided with reasonable seal groove at interval, and seal groove is unsuitable overstocked, otherwise flow resistance reduces; Seal groove should not be thin excessively, otherwise the pumping effect is not strong; Reasonably the groove width ratio can adapt to high pressure, high-velocity fluid, guarantees the boss width, prevents the fracture of boss tooth root, increases its working life, prolongs the repair cycle, guarantees Security.
(7) through numerical simulation, under 17～18Mpa hydraulic pressure operating mode, cavitation phenomenon does not take place in the inner minimum pressure above bubble point pressure of the application's Seal cage in the sealed chamber.
Description of drawings
Fig. 1 is the application's sealing configuration overall schematic.
Fig. 2 is the partial enlarged drawing of the application's sealing configuration.
Fig. 3 is the semi-circular features structural representation of the application's sealing configuration.
Among the figure: 1 seal groove; 2 dams; 3 boss; 4 seal rings.
Embodiment
Is that embodiment is described in detail the application below in conjunction with technological scheme with the nuclear main pump.
The application's sealing is made up of two semicircle seal rings, can be installed in impeller outlet and stator dynamic and static gaps and the impeller eye wheel cap place and the import honeycomb duct dynamic and static gaps place of nuclear main pump, perhaps is installed on heat shielding and rotating shaft gap location.Seal ring back of the body arc is installed along the conduit of fixed component, and the seal groove arc direction is in contrast to the rotor sense of rotation.The application's sealing configuration mainly is made up of sealing dam, seal boss and seal ring.
Seal ring inner ring circumferencial direction can be provided with many seal grooves, and is shown in Figure 1, whenever at a distance from 5 ° seal groove is set.
Because the viscous force effect of medium, the rotor rotation drives the fluid rotation, and working medium gets into the camber line seal groove; Form with leakage flow is rightabout and flow; This part fluid is obstructed in seal groove inlet and forms the high pressure endless belt, and the pressure head of endless belt has reduced the pressure head of leakage flow, has hindered flowing of leakage flow.
There is dynamic and static gaps in the outlet of nuclear main pump impeller with the stator place; Between impeller eye wheel cap place and import honeycomb duct, also there is dynamic and static gaps, when the nuclear main pump normally moves, has part to leak along this gap through the high-pressure liquid of impeller outlet; And be back to the nuclear main pump inlet again; Disturb the main flow field to flow, reduce effective flow area simultaneously, reduce the flow efficiency and the performance of nuclear main pump; Have the gap between heat shielding and the rotating shaft, high-temperature, high pressure fluid leaks along this gap, and subordinate's parts are subject to its influence, causes fluctuation of service even damage.In order to ensure each the parts safe operation of nuclear main pump, should reduce these leakages as far as possible, the application's sealing structure is arranged on above-mentioned dynamic and static gaps place.
Claims (5)
1. a nuclear main pump is with wedge groove camber line sealing configuration; It is characterized in that; Seal ring (4) is housed on the rotating machinery static part; Seal ring internal surface intermediate portion is provided with the camber line seal groove (1) of rectangle, and seal groove (1) is arranged at the seal ring internal surface by the opposite direction of rotor rotation, and seal groove (1) bottom surface is the scarf of low depth import to high degree of depth outlet transition;
The camber line seal groove is arranged on the seal ring intermediate portion, and the import and export boss of sealing forms the dam, and camber line seal groove intermediate projections partly forms boss.
2. sealing configuration according to claim 1 is characterized in that, seal groove (1) import sidewall with axially become 30 ° ~ 75 ° angles.
3. sealing configuration according to claim 1 is characterized in that, seal groove (1) medial axis, bottom surface and circumference tangent plane angle are 1 ° ~ 10 °, and seal groove (1) is imported and exported the base and circumferencial direction tangent line angle is-30 ° ~ 30 °.
4. sealing configuration according to claim 1 is characterized in that, seal groove (1) inlet face is 5% to 20% of a seal ring axial length apart from the seal ring inlet face, and seal groove (1) exit face is 5% to 20% of a seal ring axial length apart from the seal ring exit face.
5. sealing configuration according to claim 1 is characterized in that, per 5 ° ~ 15 ° are provided with a seal groove (1), and seal groove (1) width is 2 ° ~ 7 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100920058A CN102155431B (en) | 2011-04-13 | 2011-04-13 | Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100920058A CN102155431B (en) | 2011-04-13 | 2011-04-13 | Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump |
Publications (2)
| Publication Number | Publication Date |
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| CN102155431A CN102155431A (en) | 2011-08-17 |
| CN102155431B true CN102155431B (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100920058A Active CN102155431B (en) | 2011-04-13 | 2011-04-13 | Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112431789A (en) * | 2020-11-25 | 2021-03-02 | 上海凯士比泵有限公司 | Sealing ring with high-efficient sealing performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2013963C3 (en) * | 1969-03-31 | 1974-07-04 | Maschinenfabrik Andritz Ag, Graz (Oesterreich) | Sealing device for pressurized high temperature liquid conveying centrifugal pumps |
| JP4532142B2 (en) * | 2003-12-22 | 2010-08-25 | 株式会社荏原製作所 | Fluid machinery sealing mechanism or centrifugal pump |
| CN2795503Y (en) * | 2005-05-24 | 2006-07-12 | 上海凯泉泵业（集团）有限公司 | Seal device for multiple stage inner circulation type shield pump |
| CN201521433U (en) * | 2009-09-08 | 2010-07-07 | 合肥通用机械研究院 | Hydrostatic and hydrodynamic combined three-stage mechanical seal device for nuclear reactor coolant pump |
| CN101985981A (en) * | 2010-10-18 | 2011-03-16 | 清华大学 | Dynamic and static pressure integrated mechanical sealing structure with inclined straight line slots of nucleus main pump |
| CN201972955U (en) * | 2011-04-13 | 2011-09-14 | 大连理工大学 | Dynamic and static clearance wedge groove arc sealing structure for nuclear main pump |
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| CN102155431A (en) | 2011-08-17 |
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