CN102352922A - Self-centering floating brush type sealing tile - Google Patents
Self-centering floating brush type sealing tile Download PDFInfo
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- CN102352922A CN102352922A CN2011102992489A CN201110299248A CN102352922A CN 102352922 A CN102352922 A CN 102352922A CN 2011102992489 A CN2011102992489 A CN 2011102992489A CN 201110299248 A CN201110299248 A CN 201110299248A CN 102352922 A CN102352922 A CN 102352922A
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- bearing bush
- sealing bearing
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- ring
- sealing
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Abstract
The invention discloses a self-centering floating brush type sealing tile, comprising an upper half sealing tile and a lower half sealing tile, wherein the upper half sealing tile and the lower half sealing tile are fastened by bolts at a central parting surface; and the inner surfaces of the sealing tiles are tungsten and gold surfaces. The self-centering floating brush type sealing tile is characterized in that the inner surfaces of the sealing tiles are concave to form a groove for arranging a brush ring; the groove for arranging the brush ring is internally provided with the brush ring; and the brush ring is in zero-gap or interference-fit match with a generator rotor. In the self-centering floating brush type sealing tile, a more ideal solution is provided for sealing the end part of a hydrogen-cooling generator, so that compared with the existing common sealing tiles, the sealing performance is greatly improved, the hydrogen leakage and the hydrogen pollution can be effectively reduced, simultaneously the faults such as jamming and eccentric wearing and the like of the sealing tile are reduced, the service life is prolonged and the economy and the safety of operation of a hydrogen-cooling generator set are improved.
Description
Technical field
The present invention relates to a kind ofly, especially relate to a kind of brush seal that is used for the hydrogen cooled generator end seal, belong to the brush seal technical field.
Background technique
Because the hydrogen thermal capacitance is big, thermal conductivity is higher more than 6 times than air, and is mobile better than air, and weight makes that the ventilation frictional loss in the generator reduces greatly, so modern unit heavy-duty generator generally adopts hydrogen-cooled technology less than 1/10 of air.For make unit can be safely, reliable, economic, operation stably, guarantee strictly in the machine that hydrogen does not leak outside and high-purity is very necessary.Hydrogen purity is defective, will cause machine inner member local superheating, and the existence of harmful gas also can cause insulation ag(e)ing, iron core and metal parts corrosion thereof, directly influences the safety of unit.If hydrogen purity drops in the range of explosion, possibly also can set off an explosion under certain conditions; In addition, when hydrogen purity descended, the density of mixed gas rose thereupon, will cause ventilation frictional loss increase in the generator, reduced the efficient of generator.According to U.S. GE company introduction, an operation hydrogen pressure is 0.5MPa, and capacity is the hydrogen cooled generator of 907MW, and its hydrogen purity drops at 95% o'clock from 98%, and the ventilation frictional loss approximately increases by 32%, promptly is equivalent to lose 685KW.Generally speaking, when the Hydrogen Vapor Pressure in the machine is constant, the every reduction by 1% of hydrogen purity, its ventilation frictional loss increases about 11%.To sum up, hydrogen purity reduces the economy and the safe operation of serious threat unit, the interior hydrogen purity of method raising machine that must utilize blowdown, mend hydrogen.
In order to keep hydrogen gas pressure stabilization and high-purity in the generator, reduce blowdown and the number of times of mending hydrogen as far as possible, be provided with special seal arrangement at the generator ' s cover place.The generator seal arrangement adopts floating ring formula sealing bearing bush structure usually, passes to sealing oil stream and realizes sealing, and floating-ring seal can be divided into the single current ring, double fluid encircles and three kinds of forms of three stream rings, and the most frequently used have single current ring and double fluid encircle two kinds of forms.
When generator adopts single current ring sealing bearing bush structure, supporting sealing oil system have the vacuum purification treatment device.When unit normally moves; Sealing oil, is regulated through modulating valve after sealing oil pump boosts to the sealing oil vacuum box by the lubricating oil system supply of steam turbine, supplies with sealing bearing bush; Guaranteeing that sealing oil pressure is higher than the Hydrogen Vapor Pressure certain value, is 0.049 MPa like the requirement of GE company.The hydrogen side oil return of sealing bearing bush is after hydrogen gas segregator separates, and hydrogen turns back in the generator, and sealing oil turns back to lubricating oil return system; The empty side oil return of sealing bearing bush is through also turning back to lubricating oil return system behind U type pipe or the separator.Such sealing oil system is actually an open system; For gas and the moisture that prevents to be dissolved in the lubricant oil is carried in the generator; Influence the purity and the humidity of hydrogen; The sealing oil system specialized designs vacuum treatment installation; Be furnished with facilities such as vacuum box, vacuum pump, spraying tube, the sealing oil that the lubricant oil and the hydrogen side of supply are returned is carried out the vacuum outgas processing.Can know that by above system architecture the hydrogen that is dissolved in the hydrogen-side seal oil oil return all will be pulled away or handled by the degassing.
When generator adopts double fluid ring sealing bearing bush structure, supporting sealing oil system form by empty side and two relatively independent systems of hydrogen side.The sealing oil of empty side is supplied with by empty side sealing oil pump, guarantees that through differential pressure regulating valve empty side sealing oil pressure is higher than the Hydrogen Vapor Pressure certain value, and requiring like WH company is 0.084 MPa.The sealing oil of hydrogen side is supplied with by the hydrogen-side seal oil pump, regulates guaranteeing that hydrogen-side seal oil is pressed and equate at the sealing bearing bush place with empty side sealing oil pressure through equilibrium valve, and like the generator of employing WH technology, equilibrium valve is controlled both differential pressures in ± 490Pa.Under perfect condition, equilibrium valve is regulated and is made the both sides oil pressure equate that channelling does not take place the sealing oil of the sealing oil of empty side and hydrogen side in sealing bearing bush, and hydrogen-side seal oil system at this moment is the circulatory system of a sealing fully.But in fact, equilibrium valve is in the tracking adjustment state always, and himself precision is limited, is prone to problems such as bite, wearing and tearing, equates that definitely generation channelling phenomenon is inevitable in sealing bearing bush so hydrogen-side seal oil presses to be difficult to reach with empty side sealing oil pressure.When the hydrogen side was arrived in the channelling of empty side sealing oil, the air that is dissolved in the sealing oil was brought to the hydrogen side, finally influences the purity and the humidity of hydrogen in the generator.The liquid level of hydrogen-side seal oil fuel tank also will be elevated, and through the adjusting of Liquid level adjusting valve, the sealing oil that channelling is come will be expelled back into sky side sealing oil system, and at this moment, the hydrogen that is dissolved in the sealing oil also is pulled away thereupon; When empty side was arrived in the hydrogen-side seal oil channelling, the hydrogen that is dissolved in the sealing oil directly was brought to sky side sealing oil system, in empty side fuel tank, can emanate out, is discharged to outdoor at last.
In sum, the sealing of hydrogen is actually with oil sealing and realizes in the generator, and the effect of sealing bearing bush is exactly to keep stable oil stream.Generally speaking, sealing bearing bush cooperates total backlash with generator rotor shaft neck be 0.15～0.40mm, forms stable oil stream therebetween, and prevention hydrogen leaks outside and avoids it to be polluted.In theory, stable oily stream can be realized the sealing fully of hydrogen in the machine, but still exists hydrogen to leak outside and the continuous phenomenon that descends of purity in the engineering practice, and main cause is that gas is dissolved in the sealing oil, is that media implementation is exchanged with the sealing oil.
Summary of the invention
Be to solve the deficiency of prior art, the object of the present invention is to provide a kind of good seal performance, reduce leakage and pollution, the Economy of raising hydrogen cooled generator group operation and the self centering, floating brush sealing bearing bush of Security of hydrogen effectively.
For achieving the above object, the present invention realizes through following technological scheme:
The self centering, floating brush sealing bearing bush; Comprise first sealing bearing bush and second sealing bearing bush; Described first sealing bearing bush passes through bolton with second sealing bearing bush at the split place; The internal surface of said sealing bearing bush is a tungsten gold face; It is characterized in that; The internal surface of described sealing bearing bush is recessed to form installing brush ring groove, and described installing brush ring is with being provided with brush ring in the groove, the axle journal zero clearance or the interference fit of described brush ring and generator amature.
Described sealing bearing bush is any in single current ring sealing bearing bush, double fluid ring sealing bearing bush, the three stream ring sealing bearing bushes, and commonly used is single current ring sealing bearing bush and double fluid ring sealing bearing bush.
Wherein, in described single current ring sealing bearing bush, described installing brush ring is formed on the hydrogen side outlet place of single current ring sealing bearing bush with groove, perhaps all is formed with installing brush ring groove at the hydrogen side outlet place and the empty side outlet place of single current ring sealing bearing bush.
And in described double fluid ring sealing bearing bush, described installing brush ring is formed on groove to be located between the hydrogen sky of double fluid ring sealing bearing bush, perhaps between the hydrogen sky of double fluid ring sealing bearing bush, locates, hydrogen side outlet place and empty side outlet place be provided with installing brush ring groove.
Three stream ring sealing bearing bushes are similar with the groove generation type with the installing brush ring on the double fluid ring sealing bearing bush, and just three stream ring sealing bearing bushes can multiform become the installing brush ring groove of locating between the hydrogen sky than double fluid ring sealing bearing bush.
In addition; Described brush ring comprises first brush ring and second brush ring; First brush ring combines to form whole circle brush ring with second brush ring at the split place; Described whole circle brush ring comprises internal baffle, exterior siding and brush silk; Described brush silk is between internal baffle and exterior siding, and described internal baffle, exterior siding and brush silk are fixed through the high energy beam welding manner.
Wherein, the axle journal zero clearance or the interference fit of described brush silk and generator amature, and the diameter of described brush thread is 0.05～0.15mm, with the radially angle of generator amature be 0～30 °, its material is a self-lubricating abrasive-resistant alloy.
In addition, the matching gap of the axle journal of the tungsten of described sealing bearing bush gold face and generator amature is 0.25～0.50mm.
The invention has the beneficial effects as follows:
The present invention provides comparatively desirable solution for the end seal of hydrogen cooled generator; More existing conventional seals watt its sealability will improve greatly; The pollution that can reduce the leakage of hydrogen effectively and alleviate hydrogen improves Economy and Security that the hydrogen cooled generator group is moved.For common any type of sealing bearing bush; Reach certain rotating speed at generator amature; The journal surface that is sealing bearing bush tungsten gold face and generator amature forms before the rigidity oil film; Under effect of factors such as self gravitation; All can there be eccentric wear between sealing bearing bush and the axle journal, the sealing bearing bush thermal distortion, generally speaking; Sealing bearing bush radial clearance value is more little, and fault and accidents such as sealing bearing bush bite, vibration exceeding the standard, ovality exceed standard, the scorification of tungsten gold take place more easily; And sealing bearing bush involved in the present invention is before the rigidity oil film forms; Brush ring cooperates with the axle journal zero clearance; Play certain predetermined heart effect; Promote the formation of oil film; Prolong the life-span of sealing bearing bush tungsten gold face; Alleviate the sealing bearing bush bite; Eccentric wear and the thermal distortion that causes; Thereby its safety in operation improves greatly; Treat that the rigidity oil film forms; Brush ring reaches proper concentric with the axle journal of generator amature; Keep superior sealability, in addition, the used brush silk of described brush ring is processed by self-lubricating abrasive-resistant alloy; If contact with the generator amature interference; Under the lubricated and cooling action of sealing oil, brush silk frictional heating amount is less and can in time drain, and wearing and tearing can not occur; Anomaly such as overheated.
The present invention both had been fit to the design of new unit sealing bearing bush, also was fit to the transformation of old unit sealing bearing bush, and need not to change the unit body structure.The self centering, floating brush sealing bearing bush is stronger to generator amature adaptability, as far as old unit, if the axle journal of generator amature weares and teares, has the phenomenons that exceed standard such as ovality, tapering, and its better sealability will be removed the trouble of repairing rotor axle journal from.
Description of drawings
Fig. 1 is the package assembly schematic representation of one embodiment of the invention;
Fig. 2 is the structural representation of sealing bearing bush of the present invention;
Fig. 3 is the cross-sectional configuration schematic representation of brush ring of the present invention;
Fig. 4 is the structural representation of the embodiment of the invention one;
Fig. 5 is the structural representation of the embodiment of the invention two;
Fig. 6 is the structural representation of the embodiment of the invention three;
Fig. 7 is the structural representation of the embodiment of the invention four.
The main mark implication is following in the accompanying drawing:
1, internal baffle 2, exterior siding 3, brush silk H4, high energy beam solder joint
5, sealing bearing bush 6, tungsten gold face K7, installing brush ring groove
8, sealing seat 9, generator amature 10, hydrogen side sealing watt
11, sealing bearing bush between empty side sealing watts 12, brush ring 13, the empty side of hydrogen.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done concrete introduction.
Fig. 1 is the package assembly schematic representation of one embodiment of the invention; Fig. 2 is the structural representation of sealing bearing bush of the present invention.
As depicted in figs. 1 and 2: the self centering, floating brush sealing bearing bush; Comprise first sealing bearing bush and second sealing bearing bush; Described first sealing bearing bush passes through bolton with second sealing bearing bush at the split place; The internal surface of said sealing bearing bush 5 is a tungsten gold face 6; Wherein, The internal surface of described sealing bearing bush 5 is recessed to form installing brush ring groove K7, and described installing brush ring is with being provided with brush ring 12 in the groove K7, the axle journal zero clearance or the interference fit of described brush ring 12 and generator amature 9.
Fig. 3 is the cross-sectional configuration schematic representation of brush ring of the present invention.
Can be known by background technique, no matter be that hydrogen leaks outside or the air generator internal contamination hydrogen that bleeds, all be to be carrier with the sealing oil, so control the flow of sealing oil and the performance that the flow direction can guarantee sealing bearing bush 5 well.The present invention realizes the control of the sealing oil flow and the flow direction through installing brush ring 12 on sealing bearing bush 5.As shown in Figure 3: brush ring comprises first brush ring and second brush ring; First brush ring combines to form whole circle brush ring with second brush ring at the split place; Described whole circle brush ring comprises internal baffle 1, exterior siding 2 and brush silk 3; Described brush silk 3 is between internal baffle 1 and exterior siding 2; And described internal baffle 1, exterior siding 2 and brush silk 3 are fixed through the high energy beam welding manner, and form high energy beam solder joint H4 at soldering point.In addition, the diameter of brush silk 3 is 0.05～0.15mm, and brush silk 3 is 0～30 ° with the radially angle of generator amature 9, and its material is a self-lubricating abrasive-resistant alloy.
The installation process of brush ring 3 is: at first in first sealing bearing bush and second sealing bearing bush, be respectively charged into first brush ring and second brush ring; Then; Look the splicing mated condition reconditioning brush ring split of first brush ring and second brush ring; Brush ring 12 seam crossings are closely cooperated; Afterwards whole circle brush seal watt is carried out fine finishining; Making the tungsten gold face 6 of sealing bearing bush 5 cooperate total backlash with the axle journal of generator amature 9 is 0.25～0.50mm; The axle journal zero clearance or the interference fit of brush silk 3 and generator amature 9, first sealing bearing bush that brush ring 12 will be housed then passes through bolted with second sealing bearing bush at split.
Described sealing bearing bush is any in single current ring sealing bearing bush, double fluid ring sealing bearing bush, the three stream ring sealing bearing bushes; Commonly used is single current ring sealing bearing bush and double fluid ring sealing bearing bush; And described sealing bearing bush comprises two parts, and a side is hydrogen side sealing watt, and opposite side is empty side sealing watt.
Fig. 4 is the structural representation of the embodiment of the invention one.
As shown in Figure 4: in described single current ring sealing bearing bush; Described installing brush ring is formed on the hydrogen side outlet place of stream ring sealing bearing bush with groove K7; Promptly brush ring 12 is set, the flow of the sealing oil of strict control hydrogen side sealing watt 10 1 sides at the hydrogen side outlet place of stream ring sealing bearing bush.
Fig. 5 is the structural representation of the embodiment of the invention two.
As shown in Figure 5: in described double fluid ring sealing bearing bush; Described installing brush ring is formed on groove K7 between the hydrogen sky of double fluid ring sealing bearing bush and locates; Promptly between the hydrogen sky between hydrogen side sealing watts 10 and the empty side sealing watts 11, locate to install brush ring 12, scurry mutually to stop empty hydrogen-side seal oil.Be that sealing oil pump constantly is delivered to the sealing oil of certain pressure in the sealing seat 8; Sealing oil is leaked toward empty side and hydrogen side respectively along the gap between the axle journal of sealing bearing bush 5 and generator amature 9; Sealing oil plays the double action of sealing hydrogen and coolant seal watts 5, and brush ring 12 then plays the better controlled effect to the flow and the flow direction of sealing oil.
Fig. 6 is the structural representation of the embodiment of the invention three.
As shown in Figure 6: in described single current ring sealing bearing bush; All be formed with installing brush ring groove K7 at the hydrogen side outlet place of single current ring sealing bearing bush and empty side outlet place, promptly be provided with brush ring 12 at the empty side outlet place of the hydrogen side outlet place of hydrogen side sealing watts 10 and empty side sealing watts 11.
Fig. 7 is the structural representation of the embodiment of the invention four.
As shown in Figure 7: in described double fluid ring sealing bearing bush; Between the hydrogen sky of double fluid ring sealing bearing bush, locate, hydrogen side outlet place and empty side outlet place be provided with installing brush ring groove K7, promptly between the hydrogen sky between the empty side outlet place of the hydrogen side outlet place of hydrogen side sealing watts 10 and empty side sealing watts 11 and hydrogen side sealing watts 10 and the empty side sealing watts 11, locates to be provided with brush ring 12.
No matter embodiment three and four is the sealing bearing bush 5 of which kind of form; If all install brush ring at empty side outlet and hydrogen side outlet place; The matching gap capping of the axle journal of while sealing bearing bush 5 and generator amature 9; Guarantee the flow of certain cold oil, will benefit faults such as the bite that reduces sealing bearing bush 5, eccentric wears.
The foregoing description does not limit the present invention in any form, and all employings are equal to the technological scheme that mode obtained of replacement or equivalent transformation, all drop in protection scope of the present invention.
Claims (10)
1. self centering, floating brush sealing bearing bush; Comprise first sealing bearing bush and second sealing bearing bush; Described first sealing bearing bush passes through bolton with second sealing bearing bush at the split place; The internal surface of said sealing bearing bush is a tungsten gold face; It is characterized in that; The internal surface of described sealing bearing bush is recessed to form installing brush ring groove, and described installing brush ring is with being provided with brush ring in the groove, the axle journal zero clearance or the interference fit of described brush ring and generator amature.
2. self centering, floating brush sealing bearing bush according to claim 1 is characterized in that, described sealing bearing bush is any in single current ring sealing bearing bush, double fluid ring sealing bearing bush, the three stream ring sealing bearing bushes.
3. self centering, floating brush sealing bearing bush according to claim 2; It is characterized in that; In described single current ring sealing bearing bush; Described installing brush ring is formed on the hydrogen side outlet place of single current ring sealing bearing bush with groove, perhaps all is formed with installing brush ring groove at the hydrogen side outlet place and the empty side outlet place of single current ring sealing bearing bush.
4. self centering, floating brush sealing bearing bush according to claim 2; It is characterized in that; In described double fluid ring sealing bearing bush; Described installing brush ring is formed on groove between the hydrogen sky of double fluid ring sealing bearing bush and locates, and perhaps between the hydrogen sky of double fluid ring sealing bearing bush, locates, hydrogen side outlet place and empty side outlet place be provided with installing brush ring groove.
5. self centering, floating brush sealing bearing bush according to claim 1; It is characterized in that; Described brush ring comprises first brush ring and second brush ring; First brush ring combines to form whole circle brush ring with second brush ring at the split place; Described whole circle brush ring comprises internal baffle, exterior siding and brush silk; Described brush silk is between internal baffle and exterior siding, and described internal baffle, exterior siding and brush silk are fixed through the high energy beam welding manner.
6. self centering, floating brush sealing bearing bush according to claim 5 is characterized in that, the axle journal zero clearance or the interference fit of described brush silk and generator amature.
7. self centering, floating brush sealing bearing bush according to claim 5 is characterized in that, the diameter of described brush silk is 0.05～0.15mm.
8. self centering, floating brush sealing bearing bush according to claim 5 is characterized in that, described brush silk is 0～30 ° with the radially angle of generator amature.
9. self centering, floating brush sealing bearing bush according to claim 5 is characterized in that, the material of described brush silk is a self-lubricating abrasive-resistant alloy.
10. self centering, floating brush sealing bearing bush according to claim 1 is characterized in that, the matching gap of the tungsten gold face of described sealing bearing bush and the axle journal of generator amature is 0.25～0.50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102992489A CN102352922A (en) | 2011-09-29 | 2011-09-29 | Self-centering floating brush type sealing tile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102992489A CN102352922A (en) | 2011-09-29 | 2011-09-29 | Self-centering floating brush type sealing tile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102352922A true CN102352922A (en) | 2012-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102992489A Pending CN102352922A (en) | 2011-09-29 | 2011-09-29 | Self-centering floating brush type sealing tile |
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| CN (1) | CN102352922A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767625A (en) * | 2012-07-26 | 2012-11-07 | 齐庆民 | Directional high-temperature high-pressure motion sealing device |
| CN106090224A (en) * | 2016-07-20 | 2016-11-09 | 中铁工程装备集团有限公司 | A kind of TBM floating type dust prevention system of main driving |
| CN109104025A (en) * | 2018-10-10 | 2018-12-28 | 内蒙古聚达发电有限责任公司 | Hydrogen cooled generator double fluid ring sealing bearing bush with wedged-shaped oil film film strips viscous flow groove |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6378873B1 (en) * | 2000-06-02 | 2002-04-30 | General Electric Company | Low flow fluid film seal for hydrogen cooled generators |
| CN101604877A (en) * | 2002-11-13 | 2009-12-16 | 株式会社东芝 | Turning motor |
| CN201671661U (en) * | 2010-05-06 | 2010-12-15 | 江苏透平密封高科技有限公司 | High-pressure-bearing brush type sealing part of steam turbine |
| CN202251967U (en) * | 2011-09-29 | 2012-05-30 | 江苏透平密封高科技有限公司 | Self-centering floating brush type sealing tile |
-
2011
- 2011-09-29 CN CN2011102992489A patent/CN102352922A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6378873B1 (en) * | 2000-06-02 | 2002-04-30 | General Electric Company | Low flow fluid film seal for hydrogen cooled generators |
| CN101604877A (en) * | 2002-11-13 | 2009-12-16 | 株式会社东芝 | Turning motor |
| CN201671661U (en) * | 2010-05-06 | 2010-12-15 | 江苏透平密封高科技有限公司 | High-pressure-bearing brush type sealing part of steam turbine |
| CN202251967U (en) * | 2011-09-29 | 2012-05-30 | 江苏透平密封高科技有限公司 | Self-centering floating brush type sealing tile |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767625A (en) * | 2012-07-26 | 2012-11-07 | 齐庆民 | Directional high-temperature high-pressure motion sealing device |
| CN106090224A (en) * | 2016-07-20 | 2016-11-09 | 中铁工程装备集团有限公司 | A kind of TBM floating type dust prevention system of main driving |
| CN109104025A (en) * | 2018-10-10 | 2018-12-28 | 内蒙古聚达发电有限责任公司 | Hydrogen cooled generator double fluid ring sealing bearing bush with wedged-shaped oil film film strips viscous flow groove |
| CN109104025B (en) * | 2018-10-10 | 2024-01-26 | 内蒙古聚达发电有限责任公司 | Hydrogen-cooled generator double-flow-ring sealing tile with wedge-shaped oil film with stagnation grooves |
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Application publication date: 20120215 |