CN105587344A - Power station steam turbine high-pressure cylinder shaft seal device with limiting function - Google Patents
Power station steam turbine high-pressure cylinder shaft seal device with limiting function Download PDFInfo
- Publication number
- CN105587344A CN105587344A CN201610050633.2A CN201610050633A CN105587344A CN 105587344 A CN105587344 A CN 105587344A CN 201610050633 A CN201610050633 A CN 201610050633A CN 105587344 A CN105587344 A CN 105587344A
- Authority
- CN
- China
- Prior art keywords
- shaft seal
- shaft
- pressure cylinder
- seal
- circle
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a power station steam turbine high-pressure cylinder shaft seal device with a limiting function. By the adoption of the power station steam turbine high-pressure cylinder shaft seal device with the limiting function, the problem that the shaft seal gap of a steam turbine high-pressure cylinder is large is solved. The power station steam turbine high-pressure cylinder shaft seal device with the limiting function comprises a high-pressure cylinder shaft seal sleeve, circular springs, a plurality of arc-shaped shaft seal blocks, a rotary shaft, a graphite sealing block, low sealing teeth, bosses, spring pieces, an annular graphite seal ring cavity, a groove, high sealing teeth and an annular shaft seal ring cavity. The annular shaft seal ring cavity is formed in the inner side face of the high-pressure cylinder shaft seal sleeve in the circumferential direction. The section of each arc-shaped shaft seal block is in an I shape. A shaft seal ring is formed by the arc-shaped shaft seal blocks. The outer ends of the arc-shaped shaft seal blocks are arranged in the annular shaft seal ring cavity in a sleeved mode. A semicircular channel is formed in the outer edge of each arc-shaped shaft seal block in the circumferential direction. The lower half portions of the circular springs are fastened in the semicircular channels, and the upper half portions of the circular springs are exposed between the shaft seal ring and the annular shaft seal ring cavity. The annular graphite seal ring cavity is formed in the inner side faces of the arc-shaped shaft seal blocks in the circumferential direction. The outer end of a graphite seal ring is arranged in the annular graphite seal ring cavity in a sleeved mode.
Description
Technical field
The present invention relates to power station steam turbine shaft seal technical field, be specifically related to a kind of power station steam turbine high pressure cylinder axleSeal apparatus.
Background technology
Between the rotating shaft of power station steam turbine and cylinder body, sealing is that shaft seal mainly adopts leakoff-type shaft seal. Leakoff-type shaft sealComprise fir-tree type and interdigitated electrode structure etc., the high pressure cylinder of power station steam turbine generally adopts single interdigitated electrode structure shaft seal at present,The material hardness of this shaft seal housing is greater than the material hardness of high pressure cylinder rotating shaft, coefficient of thermal expansion and contraction difference. In order to obtainObtain good sealing effectiveness, generally the gap design between interdigitated electrode structure shaft seal housing and high pressure cylinder rotating shaft must be comparedLittle, in the time that turbine rotor is crossed critical speed, rotor amplitude is larger, and shaft sealing gear is easy to wearing and tearing. Along with machineOrganize the prolongation of running time, shaft seal gap becomes greatly gradually, causes steam loss to increase gradually, steam countershaftHeated zones length also will increase, and also rising to some extent of temperature, make swollen difference also become gradually large; Due to high pressureCylinder shaft seal housing and rotating shaft exist swollen poor, and the high sealing tooth of rotating shaft convex platform and shaft seal piece, low sealing tooth can be because sending outRaw relative displacement and make to seal tooth lodging, even causes that high pressure cylinder rotating shaft is pulled, differential expansion of HP casing increases, vapourWheel unit machine center changes, axle shakes the problems such as increase. For avoiding above-mentioned safety problem, power plant is generally at vapourWhen wheel machine overhauling, adopt the measure that radial clearance of shaft gland is tuned up, but paid high pressure cylinder shaft seal place steam lossThe economic cost increasing. In addition,, in the time of steam turbine high-pressure cylinder shaft seal imprecision, easily make gland packing leakage enter profitOil system, causes emulsification of lubricant, and oil film is damaged, and even causes bearing tungsten financeization, and bearing shell burnsThe accidents such as damage occur.
Summary of the invention
The present invention seeks to overcome the deficiency of above-mentioned prior art, propose one and can solve steam turbine high-pressure cylinder axleEnvelope causes because shaft seal gap is restive that shaft seal gap is large, shaft seal imprecision problem there is limit functionPower station steam turbine high pressure cylinder gland seal device.
Technical scheme of the present invention is achieved in that
A power station steam turbine high pressure cylinder gland seal device with limit function, comprises high pressure cylinder shaft seal cover, circleShape spring, shaft seal arc piece, rotating shaft, graphite grazing piece, low sealing tooth, boss, spring leaf, graphite are closeSeal annular compartment, groove, high sealing tooth and shaft seal circle annular compartment. High pressure cylinder shaft seal cover is by upper and lower twoBe grouped into, on high pressure cylinder shaft seal cover medial surface, along the circumferential direction offer a circle shaft seal circle annular compartment; Shaft sealArc piece section is I shape, the complete shaft seal circle of polylith shaft seal arc piece composition one circle, shaft seal arc pieceOutboard end is all sleeved in shaft seal circle annular compartment, between adjacent shaft seal arc piece, leaves gap; At shaft seal arcIn the outer rim of shape piece, along the circumferential direction offer many semicircle conduits, under the coil component spring for fastener shaft sealHalf part is fastened in semicircle conduit, and the first half is exposed between shaft seal circle and shaft seal circle annular compartment, circleShape spring topmost and shaft seal ring shape chamber roof leave nature gap; On the medial surface of shaft seal arc pieceAlong the circumferential direction offer three carbon seal ring annular compartments, on shaft seal circle medial surface, just have like this three circle stonesChina ink sealing ring annular compartment; The complete carbon seal ring of polylith graphite grazing piece composition one circle, has three circles;The outboard end of three circle graphite grazing pieces is all sleeved in three circle carbon seal ring annular compartments, graphite grazing pieceBetween inner side end and the rotating shaft of high pressure cylinder, leave certain radial clearance; Be positioned at same circle carbon seal ring annularBetween adjacent graphite grazing piece in chamber, leave gap; Spring leaf and the corresponding setting one by one of graphite grazing piece,Spring card is between graphite grazing piece and carbon seal ring annular compartment inwall; At every shaft seal arc pieceMedial extremity is positioned at both sides radially the offering respectively along rotating shaft of the carbon seal ring annular compartment in middle and outsideArticle two, perforation be mazy hydrophobic channel; High sealing tooth and low sealing tooth lay respectively at carbon seal ring twoSide is also alternately fixedly arranged on shaft seal arc piece inner side end, the groove in the corresponding rotating shaft of high sealing tooth, low sealingBoss in the corresponding rotating shaft of tooth; Between high sealing tooth and low sealing tooth and rotating shaft, leave radial clearance; Graphite is closeSeal, shaft seal circle, high pressure cylinder shaft seal cover are by inner and in the outer rotating shaft that is sleeved on successively high pressure cylinder.
As a further improvement on the present invention, the quantity of shaft seal arc piece is 6-10 piece. Every shaft seal arc pieceArc length identical, the arc length of every graphite grazing piece is identical.
As a further improvement on the present invention, in the outer rim of shaft seal arc piece all along the circumferential direction according to shaft seal arcThe stressed uniform principle of faying face of shape piece and shaft seal cover offers many semicircle conduits, and coil component spring is along semicircleConduit tightens together shaft seal arc piece, forms shaft seal circle.
As a further improvement on the present invention, a corresponding groove of high sealing tooth, two low sealing teeth pairAnswer a boss, the inner side end of graphite grazing piece is corresponding with a boss; High sealing tooth and low sealing toothShape be all fir-tree type or be interdigitated electrode structure.
As a further improvement on the present invention, in the middle of the medial extremity of every shaft seal arc piece is positioned at and outsideThe both sides of carbon seal ring annular compartment along rotating shaft radially offer being respectively of two perforations mazy dredgeAquaporin.
As a further improvement on the present invention, in each circle shaft seal circle, the gap between adjacent shaft seal arc piece is0.30mm-0.70mm; The neck gap of shaft seal arc piece and shaft seal circle annular compartment is 0.30mm-0.70mm;Gap in each circle carbon seal ring between adjacent graphite grazing piece is 0.10mm-0.30mm; Graphite grazingRadial clearance between piece and rotating shaft is 0mm-0.20mm; Graphite grazing piece and carbon seal ring annular compartmentNeck gap be 0.30mm-0.60mm.
As a further improvement on the present invention, under rotating shaft static conditions, high sealing tooth and low sealing tooth are to turningThe radial clearance of axle top is greater than its radial clearance to rotating shaft below; High sealing tooth and low sealing tooth are to rotating shaftRight-hand radial clearance is greater than its radial clearance to rotating shaft left. In the time that rotating shaft left and right directions is located, people's faceTowards steam turbine head, people's the left side is that rotating shaft is right-hand, and people's the right side is rotating shaft left.
As a further improvement on the present invention, between the high sealing tooth above rotating shaft and rotating shaft radially betweenGap is 0.40mm-0.70mm, and the radial clearance between high sealing tooth and rotating shaft below rotating shaft is0.30mm-0.60mm, the radial clearance between high sealing tooth and the rotating shaft of rotating shaft left is0.15mm-0.40mm, the radial clearance between rotating shaft right-hand high sealing tooth and rotating shaft is0.20mm-0.50mm。
As a further improvement on the present invention, between the low sealing tooth above rotating shaft and rotating shaft radially betweenGap is 0.30mm-0.60mm, and the radial clearance between low sealing tooth and rotating shaft below rotating shaft is0.25mm-0.55mm, the radial clearance between low sealing tooth and the rotating shaft of rotating shaft left is 0.25mm-0.55mm, the radial clearance between rotating shaft right-hand low sealing tooth and rotating shaft is 0.30mm-0.60mm.
Shaft seal circle of the present invention and each circle carbon seal ring are along the circumferential direction divided into some parts, the equal energy of every portionFootpath is drawn back 3 millimeters, highly sensitive, and radial yield is done in the displacement that can follow rotating shaft closely, therefore can guarantee rotating shaftThere is the time of radially wobbling to keep rotating shaft stable operation always; Between shaft seal circle and rotating shaft, adopt the knot of carbon seal ringStructure, has effectively reduced the gap between rotating shaft of steam turbine and gland seal device, and each circle carbon seal ring can be by footpathBe adjusted to the existing shaft sealing gear 0.05-0.10 millimeter that is beyond one's reach to gap, therefore, can effectively prevent high-qualityLeaking outside of steam, the internal efficiency of raising steam turbine high-pressure cylinder, performance driving economy and the safety of raising Steam TurbineProperty.
The present invention has limit function, by circular bullet being set between high pressure cylinder shaft seal cover and shaft seal arc pieceBetween spring, shaft seal arc piece and graphite grazing piece, spring leaf is set, can effectively limit sealing ring give input,Make to reduce wear between sealing ring and rotating shaft, and ensure between sealing tooth and the high pressure cylinder rotating shaft of steam turbine eternalKeep safe operation gap. High sealing tooth, low sealing tooth and graphite grazing piece exist to the radial clearance of rotating shaftRotating shaft is adjusted in the time of static state. Under static conditions, rotating shaft is because Action of Gravity Field is matrix, normallyWhen operation, the increase along with rotating speed is straight line by rotating shaft, therefore high sealing tooth and low close under static conditionsLarge than below of the radial clearance of envelope tooth above rotating shaft; Simultaneously because rotating shaft is clockwise High Rotation Speed,Steam flow countershaft has active force from left to right, and therefore under static conditions, high sealing tooth and low sealing tooth arrive rotating shaftRight-hand radial clearance is larger than left.
Adopt every shaft seal arc piece along rotating shaft axially by inner and set firmly successively multistage high sealing tooth, low sealing outwardTooth and graphite grazing piece. A corresponding groove of high sealing tooth, two corresponding boss of low sealing tooth,A corresponding boss of graphite grazing piece, this structure can play better throttling action. A high sealingThe corresponding groove of tooth can make steam flow by U-shaped structure process high sealing tooth, and two one of low sealing tooth correspondences are protrudingPlatform can make steam flow direction by inverted U structure through too low sealing tooth, then by graphite grazing piece and boss itBetween narrow and small gap, the pressure of steam flow and flow velocity will axially weaken from inside to outside gradually along rotating shaft, this alternatelyThe structure of arranging forms multiple tracks to steam flow and intercepts vapour wall, plays throttling and flow-disturbing effect, avoids high energy steamLeak outside, reach better steam packing effect. High pressure cylinder gland seal device adopts every shaft seal arc piece along rotating shaftAxially by inner and set firmly successively multistage high sealing tooth, low sealing tooth and graphite grazing piece outward, but can be because ofIn the situation that every shaft seal arc piece lengthens with respect to prior art, there is imbalance or deflection deformation. This height, structural configuration simple effect many with a generation that pressure cylinder shaft seal apparatus can reach, can save simultaneously investment and afterPhase maintenance cost.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to implementingIn example or description of the Prior Art, the accompanying drawing of required use is briefly described, and apparently, the following describesIn accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not payingGo out under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is static structure schematic diagram of the present invention;
Fig. 2 is the partial sectional view along A-A line in Fig. 1.
In figure: 1, high pressure cylinder shaft seal cover, 2, coil component spring, 3, shaft seal arc piece, 4, rotating shaft, 5, stoneChina ink sealing block, 6, low sealing tooth, 7, boss, 8, spring leaf, 9, carbon seal ring annular compartment, 10,Hydrophobic channel, 11, groove, 12, high sealing tooth, 13, shaft seal circle annular compartment, 14, semicircle conduit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearlyChu, intactly description, obviously, described embodiment is only the present invention's part embodiment, instead ofWhole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not making creationThe every other embodiment obtaining under property work prerequisite, belongs to the scope of protection of the invention.
As illustrated in fig. 1 and 2, for thering is the power station steam turbine high pressure cylinder gland seal device of limit function in embodimentStructural representation.
The power station steam turbine high pressure cylinder gland seal device with limit function in illustrative embodiment, high pressure cylinder axleBig envelope 1 is made up of upper and lower two parts, and high pressure cylinder shaft seal is overlapped and on 1 medial surface, along the circumferential direction offered a circleShaft seal circle annular compartment 13; The shaft seal arc piece 3 that polylith section is I shape forms the shaft seal circle that a circle is complete,The outboard end of these shaft seal arc pieces 3 is all sleeved in shaft seal circle annular compartment to adjacent shaft seal arc piece 3Between leave gap; Equal in the outer rim that is sleeved on all shaft seal arc pieces 3 in shaft seal circle annular compartment 13Along the circumferential direction offer three according to shaft seal arc piece 3 and the stressed uniform principle of faying face of shaft seal cover 1Semicircle conduit 14; Coil component spring 2 parts for fastener shaft seal are fastened on 14 li of semicircle conduits, anotherPart is exposed between shaft seal circle and shaft seal circle annular compartment 13, its topmost and shaft seal circle annular compartment 13Nature gap is left at top; In the inner side that is sleeved on all shaft seal arc pieces 3 in shaft seal circle annular compartment 13On face, along the circumferential direction offer three carbon seal ring annular compartments 9, on shaft seal circle medial surface, just have three like thisCircle carbon seal ring annular compartment 9; Polylith graphite grazing piece 5 forms the carbon seal ring that a circle is complete, altogether groupBecome three circles, respectively the outboard end of these graphite grazing pieces 5 is all sleeved on to three circle carbon seal ring annular compartments 9In, between the inner side end of graphite grazing piece 5 and the rotating shaft of high pressure cylinder 4, leave certain radial clearance; Be positioned atBetween adjacent graphite grazing piece 5 in same circle carbon seal ring annular compartment 9, leave gap; Spring leaf 8With graphite grazing piece 5 corresponding setting one by one, spring leaf 8 is stuck in graphite grazing piece 5 and carbon seal ring annularBetween chamber 9 inwalls; Be positioned at the carbon seal ring in middle and outside at the medial extremity of every shaft seal arc piece 3The both sides of annular compartment 9 radially offer respectively mazy hydrophobic channel of being of two perforations along rotating shaft 410; High sealing tooth 12 and low sealing tooth 6 lay respectively at carbon seal ring both sides, are alternately fixedly arranged on shaft seal arcOn piece 3 inner side ends, the groove 11 in the corresponding rotating shaft 4 of high sealing tooth 12, the corresponding rotating shaft 4 of low sealing tooth 6On boss 7; Between high sealing tooth 12 and low sealing tooth 6 and rotating shaft 4, leave radial clearance; Graphite grazingCircle, shaft seal circle, high pressure cylinder shaft seal cover 1 are by inner and in the outer rotating shaft 4 that is sleeved on successively high pressure cylinder.
The quantity of shaft seal arc piece 3 is 6-10 piece, selects integer piece. For the ease of processing, spare part when maintenanceCan use mutually, reduce Parts Inventory, save investment, the arc length of polylith shaft seal arc piece 3 is identical, i.e. annularShaft seal circle is divided into polylith shaft seal arc piece 3; The arc length of polylith graphite grazing piece 5 is identical, and annular graphite is closeSeal is divided into polylith graphite grazing piece 5.
Gap in each circle shaft seal circle between adjacent shaft seal arc piece 3 is 0.30mm-0.70mm; Shaft seal arcShape piece 3 is 0.30mm-0.70mm with the neck gap of shaft seal circle annular compartment 13.
Gap in each circle carbon seal ring between adjacent graphite grazing piece 5 is 0.10mm-0.30mm; StoneRadial clearance between China ink sealing block 5 and rotating shaft 4 is 0mm-0.20mm; Graphite grazing piece 5 is close with graphiteSeal annular compartment 9 neck gaps are 0.30mm-0.60mm.
11, two corresponding boss 7 of low sealing tooth 6 of a corresponding groove of high sealing tooth 12, this knotStructure can play better throttling action. A corresponding groove 11 of high sealing tooth 12 can make steam flow by waterSquare to the vertical direction of changing into upwards; Two corresponding boss 7 of low sealing tooth 6 can make steam flow directionChange into again horizontal direction, and then by steam flow pressure initiation one blockage vapour wall, play throttling, choked flow,The effect of flow-disturbing, forms effective steam packing. In the inner side end of graphite grazing piece 5 and rotating shaft 4 oneBoss 7 is corresponding.
In the middle of the medial extremity of every shaft seal arc piece 3 is positioned at and the carbon seal ring annular compartment 9 in outsideBoth sides radially offer respectively mazy hydrophobic channel 10 of being of two perforations along rotating shaft 4, can make absorptionThe globule at high sealing tooth 12 and low sealing tooth 6 flows out along hydrophobic channel 10, prevents water erosion shaft seal, improvesIn the shaft seal life-span, ensure dynamic balancing, is conducive to the safe operation of Steam Turbine.
High sealing tooth 12 and low sealing tooth 6 are adjusted during in static state in rotating shaft 4 to the radial clearance of rotating shaft 4Whole. Under static conditions, rotating shaft 4 is because Action of Gravity Field becomes matrix, steam turbine in the time of normal operation, rotating shaft 4By the increase along with rotating speed, rotating shaft is straight line, floats, therefore in static state when rotating shaft 4 is more staticWhile adjusting each section of shaft seal under condition, ensure high sealing tooth 12 and low sealing tooth 6 to rotating shaft 4 tops radiallyGap is greater than its radial clearance to rotating shaft 4 belows; Steam turbine is in the time of normal operation, and rotor is to turn clockwiseMoving, because steam flow countershaft 4 has active force from left to right, therefore to ensure high sealing tooth 12 and low sealingTooth 6 is greater than its radial clearance to rotating shaft 4 lefts to right-hand radial clearance of rotating shaft 4.
Radial clearance between high sealing tooth 12 and the rotating shaft 4 above rotating shaft 4 is 0.40mm-0.70mm,Radial clearance between high sealing tooth 12 and rotating shaft 4 below rotating shaft 4 is 0.30mm-0.60mm, positionRadial clearance between high sealing tooth 12 and the rotating shaft 4 of rotating shaft 4 lefts is 0.15mm-0.40mm, is positioned atRadial clearance between high sealing tooth 12 and rotating shaft 4 that rotating shaft 4 is right-hand is 0.20mm-0.50mm.
Radial clearance between low sealing tooth 6 and the rotating shaft 4 above rotating shaft 4 is 0.30mm-0.60mm,Radial clearance between low sealing tooth 6 and rotating shaft 4 below rotating shaft 4 is 0.25mm-0.55mm, positionRadial clearance between low sealing tooth 6 and the rotating shaft 4 of rotating shaft 4 lefts is 0.25mm-0.55mm, is positioned atRadial clearance between low sealing tooth 6 and rotating shaft 4 that rotating shaft 4 is right-hand is 0.30mm-0.60mm.
Every shaft seal arc piece 3 along rotating shaft 4 axially by inner and set firmly successively multistage high sealing tooth 12, low close outwardEnvelope tooth 6 and 11, two low sealing teeth 6 of 5, one high sealing teeth of graphite grazing piece, 12 corresponding groovesThe corresponding boss 7 of 7, one graphite grazing pieces of a corresponding boss 5, this structure can play better jointStream effect. A corresponding groove 11 of high sealing tooth 12 can make steam flow by U-shaped structure process high sealing tooth12. Two corresponding boss 7 of low sealing tooth 6 can make steam flow direction by inverted U structure through too low sealing tooth6, then by radial clearance narrow and small between graphite grazing piece 5 and a boss 7, the pressure of steam flow and flow velocityWill be along rotating shaft 4 axially by inner and weaken gradually outward, this structure of alternately arranging forms multiple tracks to steam flow and interceptsVapour wall, plays throttling and flow-disturbing effect, forms effective steam packing, avoids leaking outside of high energy steam.
Carbon seal ring and shaft seal circle are divided into some parts by circumferencial direction, and each equal portions all can draw back 3 in footpathMillimeter, highly sensitive, radial yield is done in the displacement that can follow rotating shaft 4 closely, therefore can guarantee that rotor has radially pendulumWhen moving, still can keep rotating shaft 4 stable operations always; Coil component spring 2 not only plays the effect that shaft seal circle is made a concession,Also polylith shaft seal arc piece 3 is tightened together simultaneously; The graphite grazing adopting between shaft seal circle and rotating shaft 4Coil structures has effectively reduced the radial clearance between rotating shaft 4 and gland seal device. Graphite grazing piece 5 is a kind of softProperty graphite composite material, has the characteristics such as wear-resisting, oil resistant, high temperature resistant, ageing-resistant, resistance to chemical attack, toolThere is self-lubricating function, be beyond one's reach thereby carbon seal ring radial clearance can be adjusted to existing shaft sealing gear0.05-0.10 millimeter, effectively prevents leaking outside of high-quality steam, improves the internal efficiency of steam turbine high-pressure cylinder, improvesThe performance driving economy of Steam Turbine and security.
This device has limit function, by circle being set between high pressure cylinder shaft seal cover 1 and shaft seal arc piece 3Between shape spring 2, shaft seal arc piece 3 and graphite grazing piece 5, spring leaf 8 is set, can effectively limits sealingCircle give input, make to reduce wear between sealing ring and rotating shaft 4, and ensure that dentation seal and steam turbine turnBetween axle 4, forever remain on safe operation gap.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all at thisWithin bright spirit and principle, any amendment of doing, be equal to replacement, improvement etc., all should be included in thisWithin bright protection domain.
Claims (9)
1. a power station steam turbine high pressure cylinder gland seal device with limit function, is characterized in that comprising high pressure cylinderShaft seal cover, coil component spring, shaft seal arc piece, rotating shaft, graphite grazing piece, low sealing tooth, boss, springSheet, carbon seal ring annular compartment, groove, high sealing tooth and shaft seal circle annular compartment; High pressure cylinder shaft seal coverFormed by upper and lower two parts, on high pressure cylinder shaft seal cover medial surface, along the circumferential direction offer a circle shaft seal ring shapeChamber; Shaft seal arc piece section is I shape, the complete shaft seal circle of polylith shaft seal arc piece composition one circle; AxleThe outboard end of envelope arc piece is all sleeved in shaft seal circle annular compartment, between adjacent shaft seal arc piece, leaves gap;In the outer rim of shaft seal arc piece, along the circumferential direction offer many semicircle conduits; For the circle of fastener shaft sealShape spring the latter half is fastened in semicircle conduit, and the first half is exposed to shaft seal circle and shaft seal circle annular compartmentBetween, coil component spring topmost and shaft seal ring shape chamber roof leave nature gap; At shaft seal arc pieceOn medial surface, along the circumferential direction offer carbon seal ring annular compartment; Polylith graphite grazing piece composition one has enclosedWhole carbon seal ring, the outboard end of carbon seal ring is sleeved in carbon seal ring annular compartment, and graphite is closeBetween the envelope inner side end of piece and the rotating shaft of high pressure cylinder, leave certain radial clearance; In every shaft seal arc pieceIn the middle of side is positioned at and the both sides of the carbon seal ring annular compartment in outside radially offer respectively two along rotating shaftWhat bar connected is mazy hydrophobic channel; High sealing tooth and low sealing tooth lay respectively at carbon seal ring both sidesAnd be alternately fixedly arranged on shaft seal arc piece inner side end the groove in the corresponding rotating shaft of high sealing tooth, low sealing toothBoss in corresponding rotating shaft; Between high sealing tooth and low sealing tooth and rotating shaft, leave radial clearance; Graphite grazingCircle, shaft seal circle, high pressure cylinder shaft seal cover are by inner and in the outer rotating shaft that is sleeved on successively high pressure cylinder.
2. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1, its spyOn the medial surface of shaft seal arc piece, along the circumferential direction to offer three carbon seal ring annular compartments thereby levyOn shaft seal circle medial surface, form three circle carbon seal ring annular compartments; Polylith graphite grazing piece composition one has enclosedWhole carbon seal ring, has three circles; The outboard end of three circle carbon seal rings is all sleeved on three circle graphite grazingsIn circle annular compartment.
3. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that spring leaf and the corresponding setting one by one of graphite grazing piece, spring card is close at graphite grazing piece and graphiteBetween seal annular compartment inwall.
4. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that leaving gap between the adjacent graphite grazing piece in same circle carbon seal ring annular compartment.
5. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,The quantity that it is characterized in that shaft seal arc piece is 6-10 piece.
6. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that along the circumferential direction offering many semicircle conduits in the outer rim of shaft seal arc piece, coil component spring is along halfCircular groove road tightens together shaft seal arc piece to form shaft seal circle.
7. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that under rotating shaft static conditions, high sealing tooth and low sealing tooth are greater than to the radial clearance of rotating shaft topIt is to the radial clearance of rotating shaft below; High sealing tooth and low sealing tooth are greater than it to right-hand radial clearance of rotating shaftTo the radial clearance of rotating shaft left.
8. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that the corresponding groove of a high sealing tooth, two corresponding boss of low sealing tooth, graphite grazingThe inner side end of piece is corresponding with a boss; The shape of high sealing tooth and low sealing tooth is all fir-tree type or isInterdigitated electrode structure.
9. the power station steam turbine high pressure cylinder gland seal device with limit function as claimed in claim 1 or 2,It is characterized in that in each circle shaft seal circle, the gap between adjacent shaft seal arc piece is 0.30mm-0.70mm; Shaft sealThe neck gap of arc piece and shaft seal circle annular compartment is 0.30mm-0.70mm; In each circle carbon seal ringGap between adjacent graphite grazing piece is 0.10mm-0.30mm; Between graphite grazing piece and rotating shaft radiallyGap is 0mm-0.20mm; The neck gap of graphite grazing piece and carbon seal ring annular compartment is0.30mm-0.60mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610050633.2A CN105587344A (en) | 2016-01-26 | 2016-01-26 | Power station steam turbine high-pressure cylinder shaft seal device with limiting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610050633.2A CN105587344A (en) | 2016-01-26 | 2016-01-26 | Power station steam turbine high-pressure cylinder shaft seal device with limiting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105587344A true CN105587344A (en) | 2016-05-18 |
Family
ID=55927219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610050633.2A Pending CN105587344A (en) | 2016-01-26 | 2016-01-26 | Power station steam turbine high-pressure cylinder shaft seal device with limiting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105587344A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5161942A (en) * | 1990-10-24 | 1992-11-10 | Westinghouse Electric Corp. | Moisture drainage of honeycomb seals |
| JP2002161711A (en) * | 2000-11-30 | 2002-06-07 | Mitsubishi Heavy Ind Ltd | Shaft seal structure |
| US20020117807A1 (en) * | 2001-02-27 | 2002-08-29 | Mitsubishi Heavy Industries Ltd. | Shaft seal for a rotating machine |
| CN101660430A (en) * | 2009-09-08 | 2010-03-03 | 南京信润科技有限公司 | Telescopic brush type gland ring |
| JP2013148167A (en) * | 2012-01-19 | 2013-08-01 | Toshiba Corp | Shaft sealing device and rotary machine |
| CN205370654U (en) * | 2016-01-26 | 2016-07-06 | 山西国峰煤电有限责任公司 | Power station steam turbine high pressure cylinder shaft seal device with limit function |
-
2016
- 2016-01-26 CN CN201610050633.2A patent/CN105587344A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5161942A (en) * | 1990-10-24 | 1992-11-10 | Westinghouse Electric Corp. | Moisture drainage of honeycomb seals |
| JP2002161711A (en) * | 2000-11-30 | 2002-06-07 | Mitsubishi Heavy Ind Ltd | Shaft seal structure |
| US20020117807A1 (en) * | 2001-02-27 | 2002-08-29 | Mitsubishi Heavy Industries Ltd. | Shaft seal for a rotating machine |
| CN101660430A (en) * | 2009-09-08 | 2010-03-03 | 南京信润科技有限公司 | Telescopic brush type gland ring |
| JP2013148167A (en) * | 2012-01-19 | 2013-08-01 | Toshiba Corp | Shaft sealing device and rotary machine |
| CN205370654U (en) * | 2016-01-26 | 2016-07-06 | 山西国峰煤电有限责任公司 | Power station steam turbine high pressure cylinder shaft seal device with limit function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20050194745A1 (en) | Sealing arrangement in turbine machinery | |
| CN104520618B (en) | Shaft sealer | |
| CN101806362A (en) | Mechanical sealing device of middle rotating ring | |
| CN103016743A (en) | Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles | |
| CN204175966U (en) | The mechanical seal structure of lathe lower velocity shaft | |
| CN104074558B (en) | A kind of rotary brush labyrinth casing | |
| CN105587345A (en) | High pressure cylinder shaft seal device for power station steam turbine | |
| CN101749321B (en) | Thrust bearing used for booster | |
| CN104508277A (en) | Flexible nozzle unit and variable-capacity supercharger | |
| CN201772069U (en) | Intermediate rotation ring mechanical sealing device | |
| CN205330738U (en) | Power station steam turbine high pressure cylinder bearing seal device | |
| CN205370654U (en) | Power station steam turbine high pressure cylinder shaft seal device with limit function | |
| CN105587344A (en) | Power station steam turbine high-pressure cylinder shaft seal device with limiting function | |
| CN103899758B (en) | T-shaped staggered-type labyrinth seal capable of eliminating rotor exciting force | |
| CN203756242U (en) | Multiple labyrinth brush type vapor seal | |
| CN209413949U (en) | Intensive tooth packing | |
| US1642085A (en) | Packing gland for elastic-fluid turbines or the like | |
| CN106854995A (en) | Coal gangue power generation factory turbine low pressure cylinder gland seal device | |
| CN210799055U (en) | Steam turbine rotating partition plate and steam turbine adopting same | |
| CN205477768U (en) | Gangue power plant steam turbine high pressure cylinder shaft seal device | |
| CN105114129A (en) | Vortex motion prevention steam seal ring | |
| CN207568660U (en) | A kind of intensive toe joint touch packing | |
| CN110130997A (en) | A kind of Turbine Steam seal structure that can axially make a concession and its working method | |
| CN207960692U (en) | Actuating type packing | |
| CN205189963U (en) | Gangue power plant steam turbine low pressure jar bearing seal device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |