CN105604974A - Centrifugal pump impeller sealing structure - Google Patents
Centrifugal pump impeller sealing structure Download PDFInfo
- Publication number
- CN105604974A CN105604974A CN201511019038.4A CN201511019038A CN105604974A CN 105604974 A CN105604974 A CN 105604974A CN 201511019038 A CN201511019038 A CN 201511019038A CN 105604974 A CN105604974 A CN 105604974A
- Authority
- CN
- China
- Prior art keywords
- centrifugal
- pump
- sealing
- impeller
- centrifugal pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a centrifugal pump impeller sealing structure. The centrifugal pump impeller sealing structure comprises a centrifugal impeller front lug boss sealing gear, a centrifugal impeller back lug boss sealing gear and two graphite sealing rings, the centrifugal impeller front lug boss sealing gear and the centrifugal impeller back lug boss sealing gear are integrally machined on a centrifugal pump impeller base body matrix respectively; the two graphite sealing rings correspond to the centrifugal impeller front lug boss sealing gear and the centrifugal impeller back lug boss sealing gear respectively and are inlaid onto a pump shell. The centrifugal pump impeller sealing structure is applicable to a small-flow and high-rotation speed centrifugal pump; the centrifugal pump impeller sealing structure can achieve effective control of leakage by selecting a small sealing gap, does not increase the power loss and effectively improves the pump efficiency; compared with the conventional floating ring seal, the centrifugal pump impeller sealing structure has the advantage that in the starting process and in the stable working process, leaking cooling flow is relatively fixed, so that the working stability of the pump is effectively improved; besides, the centrifugal pump impeller sealing structure is compact, simple and reliable, and is especially applicable to design requirements of a small-sized light-weighted pump.
Description
Technical field
The invention belongs to the labyrinth seal structure of the centrifugal pump impeller of a kind of liquid-propellant rocket engine, sealing knotStructure has compact conformation, simple, meets under minim gap and uses, and can strictly control centrifugal pump and leak coolingThe advantage of flow. Being specially adapted to low discharge, high efficiency, high rotating speed liquid-propellant rocket engine centrifugal pump makesWith.
Background technology
According to current China space launch mission development need, Upper Stage rocket engine requires turbine pumpEnergy is high, quality is light, therefore needs to ensure that centrifugal pump used possesses greater efficiency and stability. Liquid rocketThe volumetric loss control of engine centrifugal wheel adopts the floating ring of the metal material nested structure labyrinth of obturaging conventionallyFormula hermetically-sealed construction, studies and thinks at present, than fixed labyrinth seal, and under identical gap condition,Floating ring normally floats under duty, and the volume leakage loss before and after centrifugal pump is relatively little. But rightThe upper stage rocket engine turbine pump little in volume, flow is little, rotating speed is high, floating if centrifugal pump impeller still adopts, there is following unfavorable factor in the rotating ring nested structure of obturaging:
1. upper stage rocket engine turbine size is little, compact conformation, the pump impeller front and back that floating ring is obturaged nested structureSealing, its structure relative complex, part is more, is unfavorable for carrying out in small space layout.
2. floating ring sealing structure, although under identical gap, efficiency is higher, it is limit by structureSystem should not be used under less seal clearance, improves the efficiency of pump thereby cannot further reduce volumetric loss,Easily produce floating ring floating effect not good, produce friction wasted work with boss before and after pump impeller, when serious, produceWearing and tearing, affect the reliability of engine operation and stablize.
3. for Upper Stage low discharge, high speed pump, before and after pump impeller, leakage rate is less, adopts floating ring closeEnvelope effect is poor, and leakage rate control is unstable. Particularly in the time of engine start, because its starting is acceleratedComparatively fast, and pump impeller rises and revolves process pump internal pressure and set up not yet completely, enters the forward and backward rate-of flow of pump non-Often little, be not enough to ensure the unsteady work smoothly of floating ring structure, very easily cause floating ring and pump impeller sealing protrudingPlatform produces friction, produces extra wasted work, affects pump performance.
Summary of the invention
Technology of the present invention is dealt with problems and is: provide a kind of labyrinth that is applicable to the efficient pump impeller of miniature high-speed closeSeal structure, it overcome floating ring formula hermetically-sealed construction that engine adopts be conventionally applied to upper stage rocket engine fromThe unfavorable factor that heart pump brings, possesses the feature of compact conformation, lighting, also can realize pump performance and steadyPromote qualitatively, and the adjusting of cooling flow after pump.
Centrifugal pump impeller hermetically-sealed construction of the present invention comprises that centrifugal wheel front boss seals tooth, centrifugal wheel rear boss is closeEnvelope tooth and two graphite-seal rings, described centrifugal wheel front boss seals the close of tooth and described centrifugal wheel rear bossEnvelope tooth is machined in respectively on centrifugal pump impeller matrix integratedly, and two described graphite-seal rings correspond respectively toDescribed centrifugal wheel front boss sealing tooth and described centrifugal wheel rear boss seal tooth and are embedded in pump case.
The number of teeth of preferred described centrifugal wheel front boss sealing tooth and rear boss sealing tooth is respectively 5～6, everyRoad sealing tooth chi is wide is 0.3mm.
The footpath that the tooth peak graphite-seal ring corresponding with it of preferred described centrifugal wheel front boss sealing tooth formsTo gap and state the tooth peak of centrifugal wheel rear boss sealing tooth and its corresponding described graphite-seal ring betweenSmallest radial gap all can reach 0.015mm.
Apply the present invention to certain upper stage rocket engine turbine pump device, with the unsteady ring type phase of traditional designRatio, has following advantage:
1, pump volumetric efficiency is high: adopt the centrifugal pump of labyrinth seal structure of the present invention, minimum monolateral sealingGap can reach 0.015mm, compares between the unsteady ring type labyrinth gland same area of common employingGap is not less than 0.05mm, can obviously reduce leakage loss, and can be in the scope in less gapInterior adjusting pump leaks cooling flow, takes into account the cooling, lubricated of the efficiency of pump and pump rear bearing, end face seal.
2, stability and structural reliability are high: for low discharge, high-revolving low specific-speed centrifugal pump,If adopt traditional floating ring formula labyrinth seal structure, in the course of the work less cooling flow can affect floatingThe unsteady centering of rotating ring, and then affect the cooling discharge stability passing through. And be high speed rotating at axleThe course of work in, rub mutually with the floating ring of metal material if there is pump impeller boss, the condition of high-voltage high-speedUnder intermetallic friction power loss can exert an influence to pump performance and operating mode stability, pump can wear and tear when seriousBoss before and after wheel, affects centrifugal pump structure reliability. And employing labyrinth seal structure of the present invention, its gapFixing, thereby leak cooling stability of flow, because sealing toothing has significantly reduced the contact of sealing positionArea, and graphite-seal ring material is softer, even if produce friction, its power consumption is also very little, can not affectEfficiency of centrifugal pump and operating mode. And in seal friction process, the normal wear that only can produce graphite-seal ring,And can centrifugal pump wheel construction not exerted an influence, reliable in structure.
3, good to the adaptability of turbine pump fast starting work: to turn for low-specific-speed, low discharge, heightSpeed centrifugal pump, if adopt the unsteady ring type labyrinth seal of tradition, accelerates high (1s at start-up period owing to startingLeft and right), to leak cooling flow little, deficiency, so that floating ring reliably floats, easily causes centrifugal wheel sealing protrudingPlatform grinds mutually with floating ring. And the labyrinth seal of structure of the present invention is fixed interval (FI), not affected by starting process.
4, simple in structure, compact, lighting: for the unsteady ring type labyrinth seal of tradition, the present invention's knotThe labyrinth seal of structure adopts sealing tooth and the integrated processing of pump impeller matrix, and graphite-seal ring adopts housing to inlayMode, do not need processing, assemble any spacingly, fixing with auxiliary component, farthest simplifiedStructure and than metal floating ring, graphite material sealing ring, quality is lighter, more meets Upper StageThe Orientation of design of engine product miniaturization, lighting.
Brief description of the drawings
Fig. 1 is sealed structural representation of the present invention.
Wherein before 1-pump, after sealed graphite ring, 2-pump, before sealed graphite ring, 3-pump impeller, seal tooth, 4-pump impellerRear sealing tooth
Fig. 2 is existing unsteady ring type labyrinth seal structure schematic diagram.
Wherein after 1-pump, float obturage before cover, 2-pump Thrust nut after unsteady obturage cover, 3-locking plate, 4-pump,Thrust nut, 6-pump back bush, 7-pump front lining before 5-pump
Detailed description of the invention
Lower for the hydraulic efficiency under its perfect condition of the high-revolving low specific-speed centrifugal pump of low discharge, because ofIf this wants guaranteed efficiency to approach perfect condition, must be from the impact of strict control volumetric loss etc. Reduce fromLeakage-gap before and after heart pump is the direct approach that improves volumetric efficiency, but too small seal clearance holdsEasily causing pump operation process, is under the effect of beating, to produce pump impeller to rub mutually with sealing ring at axle, causes extraThe fluctuation of power consumption and operating mode. The invention solves and under little gap, improve hydraulic efficiency and pump impeller and sealing ring phaseThe contradiction of rubbing. By inlay graphite-seal ring in pump case, and on centrifugal wheel front boss and rear bossProcessing sealing tooth respectively, can ensure closely spaced labyrinth sealing thereby form, and solved pump impeller withThe wear problem of sealing ring.
As shown in Figure 1, pump impeller front boss sealing tooth 3, the pump impeller rear boss of one processing on centrifugal pump impellerSealing tooth 4, the front graphite-seal ring 1 and the rear graphite-seal ring 2 that are embedded in pump case have formed jointlyThe labyrinth sealing of structure of the present invention. By choosing and adjust the seal clearance before and after pump impeller, can realizeAdjust centrifugal pump volumetric efficiency, and meet after pump the fully object of cooling for reflux.
Before and after pump impeller of the present invention, boss one group of sealing tooth of integrated processing respectively, seals depending on pump impeller boss width5～6 of the numbers of teeth, per pass sealing tooth chi is wide very narrow, conventionally gets 0.3mm, and this structure can meet increaseFlow resistance after pump, when multi-level throttle, has reduced pump impeller and sealing ring and may produce the contact area of touching mill.
Seal ring material of the present invention is selected the lower graphite material of hardness, with seal boss gap before and after pump impellerFixing, pump impeller leakage rate is also relatively stable. Because graphite belongs to lubriation material, do not need resistance to graphiteMill property is done excessive demand, the situation that graphite-seal ring and pump impeller sealing tooth join in the time that pump quick startsUnder, graphite annulus touches wear process wasted work hardly, rubs mutually than metal floating ring and pump impeller metallic matrixThe friction power loss producing is much smaller, and can not exert an influence to operating mode.
Based on this, the present invention has realized cooling leakage flow after the lifting of volumetric efficiency under little leakage-gap and pumpThe adjusting of amount. The actual centrifugal pump that adopts labyrinth seal structure of the present invention, minimum monolateral seal clearance,Gap minimum between tooth peak and the graphite-seal ring of sealing tooth can reach 0.015mm. And conventionally adoptThe gap of unsteady ring type labyrinth gland same area be not less than 0.05mm, so of the present invention closeSeal structure can be controlled at volumetric efficiency very high level. By reprocessing graphite-seal ring internal diameter, canAdjust pump impeller leakage-gap, thereby realize the object of controlling leakage flow, guarantee centrifugal pump is being taken into account pump efficiencyWhen rate, utilize after pump that leakage flow is fully cooling, lubricating pump rear bearing, face seal components. AndAnd can in the scope in less gap, regulate pump to leak cooling flow, take into account the efficiency of pump and pump rear axleHold, end face seal cooling, lubricated.
Compact conformation of the present invention, quality is light: pump impeller sealing tooth and pump impeller are taked integrated processing, graphite annulusBe inlaid into pump case, need to process assembling without additional parts, simple and reliable for structure, size is little, nonmetalThe mode that material graphite-seal ring adopts housing to inlay, does not need processing, assembles any spacing, fixing usingAuxiliary component, farthest simplifies the structure and than metal floating ring, graphite material sealsRing quality is lighter, more meets the Orientation of design of the miniaturization of upper stage rocket engine product, lighting.
Stability of the present invention and structural reliability are high: for low discharge, high-revolving low specific-speed centrifugal pump,If adopt traditional floating ring formula labyrinth seal structure, in the course of the work less cooling flow can affect floatingThe unsteady centering of rotating ring, and then affect the cooling discharge stability passing through. And be high speed rotating at axleThe course of work in, rub mutually with the floating ring of metal material if there is pump impeller boss, the condition of high-voltage high-speedUnder intermetallic friction power loss can exert an influence to pump performance and operating mode stability, pump can wear and tear when seriousBoss before and after wheel, affects centrifugal pump structure reliability. And adopting labyrinth seal structure of the present invention, gap is solidDetermine not to be subject to, thereby leak cooling stability of flow, because sealing toothing has significantly reduced the contact of sealing positionArea, and graphite-seal ring material is softer, even if produce friction, its power consumption is also very little, can shadowRing efficiency of centrifugal pump and operating mode. And in seal friction process, only can produce the normal mill of graphite-seal ringDamage, and can centrifugal pump wheel construction not exerted an influence, reliable in structure.
Adaptability to the work of turbine pump fast starting is good: for low-specific-speed, low discharge, high rotating speed fromHeart pump, if adopt the unsteady ring type labyrinth seal of tradition, accelerates a high (1s left side at start-up period owing to startingRight), to leak cooling flow little, deficiency, so that floating ring reliably floats, easily causes centrifugal wheel seal bossGrind mutually with floating ring. And the labyrinth seal of structure of the present invention is fixed interval (FI), not affected by starting process.
Claims (3)
1. a centrifugal pump impeller hermetically-sealed construction, is characterized in that: comprise centrifugal wheel front boss sealing tooth,Centrifugal wheel rear boss sealing tooth and two graphite-seal rings, described centrifugal wheel front boss sealing tooth and described fromThe sealing tooth of heart wheel rear boss is machined in respectively on centrifugal pump impeller matrix integratedly, and two described graphite are closeSeal ring corresponds respectively to described centrifugal wheel front boss sealing tooth and described centrifugal wheel rear boss seals tooth and inlaysBe embedded in pump case.
2. centrifugal pump impeller hermetically-sealed construction according to claim 1, is characterized in that: described centrifugalThe number of teeth of wheel front boss sealing tooth and rear boss sealing tooth is respectively 5～6, and per pass sealing tooth chi is wide is0.3mm。
3. centrifugal pump impeller hermetically-sealed construction according to claim 1, is characterized in that: described centrifugalThe radial clearance that the tooth peak graphite-seal ring corresponding with it of wheel front boss sealing tooth forms and described centrifugalSmallest radial gap energy between tooth peak and its corresponding described graphite-seal ring of wheel rear boss sealing toothEnough reach 0.015mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511019038.4A CN105604974A (en) | 2015-12-29 | 2015-12-29 | Centrifugal pump impeller sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511019038.4A CN105604974A (en) | 2015-12-29 | 2015-12-29 | Centrifugal pump impeller sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105604974A true CN105604974A (en) | 2016-05-25 |
Family
ID=55985201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511019038.4A Pending CN105604974A (en) | 2015-12-29 | 2015-12-29 | Centrifugal pump impeller sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105604974A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882423A (en) * | 2019-02-26 | 2019-06-14 | 西安航天动力研究所 | A kind of super-low specific speed centrifugal pump device |
| CN112983881A (en) * | 2021-05-21 | 2021-06-18 | 星河动力(北京)空间科技有限公司 | Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1226475A (en) * | 1969-05-20 | 1971-03-31 | ||
| DE3022010C2 (en) * | 1980-06-12 | 1985-03-07 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | Plastic impeller with throttle gaps |
| US5295786A (en) * | 1990-12-27 | 1994-03-22 | Ebara Corporation | Liner ring for a pump |
| US6039535A (en) * | 1997-06-23 | 2000-03-21 | Hitachi, Ltd. | Labyrinth sealing device, and fluid machine providing the same |
| CN101101004A (en) * | 2007-07-31 | 2008-01-09 | 陕西航天动力高科技股份有限公司 | Centrifugal pump mouth ring sealing device |
| CN103206404A (en) * | 2012-01-17 | 2013-07-17 | 哈米尔顿森德斯特兰德公司 | Fuel system centrifugal boost pump impeller |
| CN103438021A (en) * | 2013-09-10 | 2013-12-11 | 唐山怡人鼓风机制造有限公司 | Labyrinth seal structure of air blower |
| CN203867961U (en) * | 2014-02-14 | 2014-10-08 | 梅保胜 | Efficient centrifugal pump with impeller having a non-contact sealing function |
-
2015
- 2015-12-29 CN CN201511019038.4A patent/CN105604974A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1226475A (en) * | 1969-05-20 | 1971-03-31 | ||
| DE3022010C2 (en) * | 1980-06-12 | 1985-03-07 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | Plastic impeller with throttle gaps |
| US5295786A (en) * | 1990-12-27 | 1994-03-22 | Ebara Corporation | Liner ring for a pump |
| US6039535A (en) * | 1997-06-23 | 2000-03-21 | Hitachi, Ltd. | Labyrinth sealing device, and fluid machine providing the same |
| CN101101004A (en) * | 2007-07-31 | 2008-01-09 | 陕西航天动力高科技股份有限公司 | Centrifugal pump mouth ring sealing device |
| CN103206404A (en) * | 2012-01-17 | 2013-07-17 | 哈米尔顿森德斯特兰德公司 | Fuel system centrifugal boost pump impeller |
| CN103438021A (en) * | 2013-09-10 | 2013-12-11 | 唐山怡人鼓风机制造有限公司 | Labyrinth seal structure of air blower |
| CN203867961U (en) * | 2014-02-14 | 2014-10-08 | 梅保胜 | Efficient centrifugal pump with impeller having a non-contact sealing function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882423A (en) * | 2019-02-26 | 2019-06-14 | 西安航天动力研究所 | A kind of super-low specific speed centrifugal pump device |
| CN109882423B (en) * | 2019-02-26 | 2020-11-06 | 西安航天动力研究所 | Centrifugal pump device with ultralow specific speed |
| CN112983881A (en) * | 2021-05-21 | 2021-06-18 | 星河动力(北京)空间科技有限公司 | Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine |
| CN112983881B (en) * | 2021-05-21 | 2021-09-17 | 星河动力(北京)空间科技有限公司 | Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111173658B (en) | Low-inlet-pressure high-supercharging-capacity combined electric pump | |
| CN106415011B (en) | Gear petrolift | |
| CN105604974A (en) | Centrifugal pump impeller sealing structure | |
| CN103104477A (en) | Asymmetric valve plate for fixed pure water hydraulic axial plunger pump | |
| CN103398020A (en) | Water pump wear-ring sealing device and wear-ring thereof | |
| CN207621031U (en) | A kind of single-stage cantilever centrifugal pump | |
| CN115059862B (en) | Intelligent hydraulic generator | |
| CN108708976A (en) | Zero leakage non-contact mechanical seal structure | |
| CN104728124A (en) | Multi-stage centrifugal pump | |
| CN108869384A (en) | A kind of centrifugal pump radial seal ring with cylindrical type guide vane | |
| CN205117605U (en) | Oily tilt cylinder plunger type hydraulic motor is joined in marriage to axle | |
| CN211397876U (en) | Small-flow single-shaft forward and reverse screw extrusion type magnetic force driving pump | |
| CN202381388U (en) | Single-suction centrifugal pump and mechanical seal device for same | |
| CN204113758U (en) | A kind of pump shaft balanced controls of multistage acid resistant alkali centrifugal pump | |
| CN219035549U (en) | Cooling dynamic sealing structure for lubricating oil pump | |
| CN220081738U (en) | Impeller and pump housing sealing assembly and pump unit with same | |
| CN221053930U (en) | Multistage differential pressure adjustment balance-based segmental multistage pump | |
| CN203627290U (en) | Engine water pump sealing structure assembly | |
| CN220081737U (en) | Impeller and pump shell wear-resistant component and pump unit with wear-resistant component | |
| CN208057511U (en) | A kind of impeller intake dynamic sealing device of New Centrifugal Pump | |
| CN204175654U (en) | Certainly the flushing mine tailings stock pump of a kind of high sealing, improved corrosion | |
| CN108730201A (en) | Double-suction submerged pump | |
| CN208670059U (en) | Zero leakage non-contact mechanical seal structure | |
| CN202073783U (en) | High-pressure vane pump | |
| CN221053939U (en) | Self-adjusting thrust structure of high-lift shielding pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160525 |
|
| WD01 | Invention patent application deemed withdrawn after publication |