CN103883363A - Non-contact type brush-type seal and manufacturing method thereof - Google Patents
Non-contact type brush-type seal and manufacturing method thereof Download PDFInfo
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- CN103883363A CN103883363A CN201410131778.6A CN201410131778A CN103883363A CN 103883363 A CN103883363 A CN 103883363A CN 201410131778 A CN201410131778 A CN 201410131778A CN 103883363 A CN103883363 A CN 103883363A
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- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000000694 effects Effects 0.000 claims abstract description 12
- 210000004907 gland Anatomy 0.000 claims abstract description 12
- 238000003466 welding Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000009730 filament winding Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 5
- 230000001052 transient effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 230000009466 transformation Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
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Abstract
The invention discloses a non-contact type brush-type seal and a manufacturing method of the non-contact type brush-type seal. The non-contact type brush-type seal comprises a gland sealing ring, a front baffle and a rear baffle, wherein the front baffle and the rear baffle are arranged on the gland sealing ring. The front baffle, brush brittles and the rear baffle are welded into a whole. The front baffle is located on the air inlet side and is in riveting joint with an installation groove in the gland sealing ring so as to be assembled with the gland sealing ring. The non-contact type brush-type seal further comprises a U-shaped riveting groove. The U-shaped riveting groove is located on the air inlet side. A certain dip angle is formed by the brush brittles in the rotating direction of a rotor. The non-contact type brush-type seal has the remarkable advantages that the seal can be adapted to the transient bounce of the rotor, gaps are kept unchanged, the sealing effect of the seal is kept for a long time, the brush bristles are resistant to high temperature and long in service life and are arranged in the rotation direction of the rotor at a certain angle, friction vibration can be reduced, and influence on the safety of a unit is small. According to the manufacturing method of the non-contact type brush-type seal, it is guaranteed that the seal is not broken in the operation process, the high-performance welding technology is adopted to guarantee that the brush bristles do not fall off, the optimized brush bristle bunch thickness and height guarantee the high sealing performance, and the sealing effect is guaranteed.
Description
Technical field
The Sealing that the present invention relates to steam turbine is manufactured field, particularly a kind of contactless brush seal making method.
Background technique
Sealing can be divided into the large class of motive sealing two between static seal and the relative movement mating face between relative stationary engagement face.Static seal mainly contains dot encapsulation, and glue sealing seals three major types with contacting.Motive sealing can be divided into rotary seal and two kinds of fundamental types of reciprocation sealing.Whether contact with the component of its effect relative movement by Sealing, can be divided into contact seal and noncontact seal.In general, the good airproof performance of contact seal, but limited by fretting wear, be applicable to the occasion that sealing surface linear velocity is lower.The sealing of noncontact seal is poor, is applicable to the occasion of fair speed, as packing seal arrangement in steam turbine.Between the dividing plate and rotor of current Turbine Flow Path, all there is gap between movable vane leaf top and cylinder and between the reaction-type stage stator blade of drum structure and rotary drum, and before and after gap, there is pressure difference, thereby enter level steam some by movable vane passage, but through after gap flows to, cause damage; And prevent from rubbing between sound, steam turbine two ends and through main shaft must leave certain gap, but due to the existence of pressure difference, always there is part steam to outward leakage at high voltage terminal, cause degree of vacuum to be destroyed for avoiding entering cylinder at low voltage terminal air, generally need send into a little more than atmospheric gland steam, this steam part is bled in low pressure (LP) cylinder, another part outwards spills, and these are revealed steam and do not make any useful work, thereby cause outside air loss.In order to reduce the gas leakage in above-mentioned gap everywhere, ensure again the normal safe operation of steam turbine, spy is provided with various packings.Modern turbine steam seal generally adopts mazy type broach packing, and the sealing principle of labyrinth gland is a series of throttle clearance and the expansion cavity forming between tooth and rotor, makes the working steam generation throttling and the thermomechanical effect that pass through reach sealing effect.But still after existing labyrinth clearance to be in operation can not to adjust, heat up, sealing effect can not guarantee, gland sealing gear and axle touch mill and easily cause the deficiencies such as permanent wearing and tearing, causes leakage rate to increase, and affects unit economy.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of contactless brush seal and preparation method thereof, can effectively reduce gas leakage.
In order to realize above-mentioned target, the present invention adopts following technological scheme:
A kind of contactless brush seal, comprise steam seal ring, be located at front screen and backboard in sealing gland, it is characterized in that, described front screen, brush silk and backboard assembly welding are integral, and front screen is positioned at air inlet side, by with steam seal ring on mounting groove rivet so that with steam seal ring assembling, also comprise U-shaped riveted joint groove, described U-shaped riveted joint groove is positioned at air inlet side, described brush silk has certain inclination angle along rotor direction, and described inclination angle angle is 40-50 °.
A kind of contactless brush seal, is characterized in that, described inclination angle angle is 45 °.
A kind of contactless brush seal, is characterized in that, the spacing of described riveted joint groove and mounting groove is 0.5-1.5mm.
Brush seal is by front panel, rear board and be sandwiched in the brush that highly dense alloy fine wire between the two forms and form, brush oppositely has certain inclination angle along rotor, so, the hairbrush of being obedient to can tilt to absorb rotor radial skew, and be easy to recover closed state, after short-term and axle Interference contact, can be not the same with honeycomb seal as labyrinth seal, there is permanent performance loss.
A making method for contactless brush seal, is characterized in that, comprises the steps:
Step 1, steam seal ring fluting design: calculate reserved brush strip of paper used for sealing mounting groove and riveted joint groove in steam seal ring by fluid mechanics; Brush steam seal transformation is generally high tooth transformation, replaces a high tooth in original steam seal ring transform by brush envelope, and the central position of replaced high tooth is depended in the position of mounting groove, and riveted joint groove is positioned at air inlet side;
Step 5, row's silk: first location piece is inserted to lower plate, the short tow of then step 3 being made is pressed lower plate angle row silk, until stop while meeting technological requirement length, cover upper die plate, adjust brush silk, brush filament length degree exceeds frock edge 0.3-0.5mm, uses in order to welding;
Step 8, assembling: U-shaped design and the automation riveting of body riveted joint groove, on the rolling riveter of our unit's independent research, by gear transmission, while making steam seal ring pass through rolling riveter, riveted joint groove is pressed several angle, reaches the effect that compresses brush strip of paper used for sealing, has not only improved riveting quality but also improved manufacturing efficiency; Riveted joint groove is in order to brush strip of paper used for sealing and steam seal ring is rigidly connected, and prevents from brushing strip of paper used for sealing and becomes flexible;
Step 9, the processing of bristle: by figure paper size (it is generally 0.1 ~ 0.5mm that bristle exceeds high tooth) fine finishing bristle, steam seal ring segmental arc is positioned on homemade positioning tool, processes bristle by wire cutting machine tool, ensures the concentricity requirement of bristle, note split vertical cut technique, meet on-the-spot installation requirement, when on-the-spot installation, easily 45 ° of spurs of appearance are hit curved situation, and gland sealing gear alignment is more difficult, in order to address these problems, select split vertical cut technique;
Step 10, cleans, packs.
A making method for contactless brush seal, is characterized in that, the spacing of riveting groove and mounting groove described in step 1 is 0.5-1.5mm.
A making method for contactless brush seal, is characterized in that, the radical of the silk of brush described in step 3 is 180 ~ 200 pieces/square millimeter.
A making method for contactless brush seal, is characterized in that, described in step 4, forward and backward baffle plate material is 316L stainless steel, and described front screen thickness is 0.8-1mm, and described backboard thickness is 0.5-0.6mm.
A making method for contactless brush seal, is characterized in that, technological requirement described in step 5 is that the effective arc length of steam seal ring segmental arc adds 20-30mm machining allowance.
A making method for contactless brush seal, is characterized in that, welding method described in step 6 is laser bonding: the laser beam that utilizes high-energy-density is fused into forward and backward baffle plate and brush silk as thermal source and is made into integration brush strip of paper used for sealing.
Usefulness of the present invention is: 1. contactless brush seal of the present invention belongs to flexible sealing, can adapt to rotor transient state beats and keeps gap constant, long-term its sealing effect that ensures, brush silk is high temperature resistant, long service life, clockwise sub-sense of rotation has angle to arrange, and can reduce frictional vibration, less on the impact of unit safety; 2. the making method of contactless brush seal of the present invention ensures in running not fracture, and high performance welding procedure ensures that brush silk does not come off, and the bristle row thickness of optimization and highly ensure high performance obturaging property ensures sealing effect; 3. the present invention draws the impact of brush bundle free height on levels of leakage by experiment, and brush bundle free height reduces, and the leadage coefficient of brush seal decreases, and brush bundle free height is less, this variation is also strong with regard to Shaoxing opera, thereby has improved preparation process, reaches better effect.
Brief description of the drawings
Fig. 1 is contactless brush seal schematic diagram of the present invention;
Fig. 2 is contactless brush seal row silk frock schematic diagram of the present invention.
The implication of reference character in figure:
1. steam seal ring, 2. front screen, 3. brush silk, 4. backboard, 5. riveted joint groove, 6. upper die plate, 7. lower plate.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to concrete introduction.
In conjunction with Fig. 1, contactless brush seal of the present invention, comprise steam seal ring 1, be located at front screen 2 and backstop 4 plates on sealing gland circle 1, described front screen 2, brush silk 3 is integral with backboard 4 assembly weldings, and front screen 2 is positioned at air inlet side, by with steam seal ring 1 on mounting groove rivet and then assemble with steam seal ring 1, also comprise U-shaped riveted joint groove 5, described U-shaped riveted joint groove 5 is positioned at air inlet side, described brush silk 3 is 45° angle along rotor direction, brush silk 3 clockwise sub-sense of rotation have angle to arrange, can reduce frictional vibration, impact on unit safety is less, brush steam seal transformation is generally high tooth transformation, replacing a high tooth in original steam seal ring by brush envelope transforms, the central position of replaced high tooth is depended in the position of mounting groove, described U-shaped riveted joint groove 5 is 1mm with mounting groove spacing.
The brush silk 3 that brush seal comprises front screen 2, backboard 4 and is sandwiched in highly dense alloy fine wire between the two composition forms, brush has certain inclination angle along rotor direction, so, the hairbrush of being obedient to can tilt to absorb rotor radial skew, and be easy to recover closed state, after short-term and axle Interference contact, can be not the same with honeycomb seal as labyrinth seal, there is permanent performance loss.
Contactless brush seal of the present invention, except said structure, its difference is, and described brush silk 3 is 50 ° of angles along rotor direction, and described U-shaped riveted joint groove 5 is 0.5mm with mounting groove spacing.
Contactless brush seal of the present invention, except said structure, its difference is, and described brush silk 3 is 40 ° of angles along rotor direction, and described U-shaped riveted joint groove 5 is 1.5mm with mounting groove spacing.
The making method of contactless brush seal of the present invention, comprises the steps:
Step 1, steam seal ring fluting design: calculate by fluid mechanics, reserved brush strip of paper used for sealing mounting groove and U-shaped riveted joint groove 5 in steam seal ring 1, U-shaped riveted joint groove 5 is positioned at air inlet side, with mounting groove spacing be 1mm;
Step 5, row's silk: first location piece is inserted to lower plate 7, then the short tow of step 3 being made is pressed the angle row silk of lower plate 7, until stop while meeting technological requirement (the effective arc length of steam seal ring segmental arc adds 20mm machining allowance) length, cover upper die plate 6, adjust brush silk 3, brush silk 3 length exceed frock edge 0.3mm, use in order to welding;
Step 8, assembling: U-shaped design and the automation riveting of body riveted joint groove, on the rolling riveter of our unit's independent research, by gear transmission, while making steam seal ring pass through rolling riveter, riveted joint groove is pressed several angle, reaches the effect that compresses brush strip of paper used for sealing, has not only improved riveting quality but also improved manufacturing efficiency; Riveted joint groove is in order to brush strip of paper used for sealing and steam seal ring is rigidly connected, and prevents from brushing strip of paper used for sealing and becomes flexible;
Step 9, the processing of bristle: by figure paper size (bristle exceeds high tooth 0.1 mm) fine finishing bristle, steam seal ring segmental arc is positioned on homemade positioning tool, processes bristle by wire cutting machine tool, ensures the concentricity requirement of bristle, note split vertical cut technique, meet on-the-spot installation requirement, when on-the-spot installation, easily 45 ° of spurs of appearance are hit curved situation, and gland sealing gear alignment is more difficult, in order to address these problems, select split vertical cut technique;
Step 10, cleans, packs.
The making method of contactless brush seal of the present invention, except said method, its difference is, described U-shaped riveted joint groove 5 is 0.5mm with mounting groove spacing; The angle of the centripetal locating slot of described lower plate is 50 °; The radical of described brush silk is 190 pieces/square millimeter, and the high temperature cobalt-based silk (700 DEG C) of the diameter 0.08mm of rolling is coiled into vertical bar brush tow by operator, and then making length is the short tow of 25mm; Described front screen thickness is 0.9mm, and backboard thickness is 0.55mm; Described brush filament length degree exceeds frock edge 0.5mm; Described bristle exceeds high tooth 0.3mm.
The making method of contactless brush seal of the present invention, except said method, its difference is, described U-shaped riveted joint groove 5 is 1.5mm with mounting groove spacing; The angle of the centripetal locating slot of described lower plate is 40 °; The radical of described brush silk is 200 pieces/square millimeter, and the high temperature cobalt-based silk (680 DEG C) of the diameter 0.1mm of rolling is coiled into vertical bar brush tow by operator, and then making length is the short tow of 30mm; Described front screen thickness is 1mm, and backboard thickness is 0.6mm; Described brush filament length degree exceeds frock edge 0.4mm; Described bristle exceeds high tooth 0.5mm.
The making method of contactless brush seal of the present invention can draw the impact of brush bundle free height on levels of leakage by experiment, brush bundle free height reduces, the leadage coefficient of brush seal decreases, and brush bundle free height is less, and this variation is also strong with regard to Shaoxing opera; The impact of brush silk thickness on brush seal levels of leakage, can find out from experiment, and along with the brush silk number of plies is increased to 10 layers of again to 14 layer by 6 layers, the levels of leakage of brush seal constantly reduces, but reduction amplitude slightly reduces.
The contactless brush seal of preparing by this method has put into production and has tried out, respond well, can adapt to rotor transient state and beats and keep gap constant, can reach its sealing effect of long-term guarantee, and be applicable to be widely used.
More than show and described basic principle of the present invention, major character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technological scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (9)
1. a contactless brush seal, comprise steam seal ring, be located at front screen and backboard in sealing gland, it is characterized in that, described front screen, brush silk and backboard assembly welding are integral, and front screen is positioned at air inlet side, by with steam seal ring on mounting groove rivet so that with steam seal ring assembling, also comprise U-shaped riveted joint groove, described U-shaped riveted joint groove is positioned at air inlet side, described brush silk has certain inclination angle along rotor direction, and described inclination angle angle is 40-50 °.
2. contactless brush seal according to claim 1, is characterized in that, described inclination angle angle is 45 °.
3. contactless brush seal according to claim 1, is characterized in that, the spacing of described riveted joint groove and mounting groove is 0.5-1.5mm.
4. a making method for contactless brush seal, is characterized in that, comprises the steps:
Step 1, the design of steam seal ring fluting: reserved brush strip of paper used for sealing mounting groove and riveted joint groove in steam seal ring, riveted joint groove is positioned at air inlet side;
Step 2, the making of row's silk frock: described row's silk frock includes the lower plate of centripetal 40-50 ° locating slot, also comprises upper die plate, locating stud, location piece, clamp device;
Step 3, the making of brush silk: the cobalt-based filament winding of 650-700 DEG C of the diameter 0.05-0.1mm of rolling is become to vertical bar brush tow, and then making length is the short tow of 20-30mm;
Step 4, the making of forward and backward baffle plate: forward and backward baffle plate is by roll forming;
Step 5, row's silk: first location piece is inserted to lower plate, the short tow of then step 3 being made is pressed lower plate angle row silk, until stop while meeting technological requirement length, cover upper die plate, adjust brush silk, brush filament length degree exceeds frock edge 0.3-0.5mm, uses in order to welding;
Step 6, welding: forward and backward baffle plate and brush silk are fused into and are made into integration brush strip of paper used for sealing;
Step 7, polishing school arc: the face of weld of brush strip of paper used for sealing is polished flat and polishing top and bottom, will brushes strip of paper used for sealing diameter by school arc frock and become identical with body mounting groove diameter school;
Step 8, assembling: on rolling riveter, by gear transmission, while making steam seal ring pass through rolling riveter, riveted joint groove is pressed several angle, reaches the effect that compresses brush strip of paper used for sealing;
Step 9, the processing of bristle: exceed high tooth 0.1 ~ 0.5mm fine finishing bristle by bristle, steam seal ring segmental arc is positioned on homemade positioning tool, processes bristle by wire cutting machine tool;
Step 10, cleans, packs.
5. the making method of contactless brush seal according to claim 4, is characterized in that, the spacing of riveting groove and mounting groove described in step 1 is 0.5-1.5mm.
6. the making method of contactless brush seal according to claim 4, is characterized in that, the radical of the silk of brush described in step 3 is 180 ~ 200 pieces/square millimeter.
7. the making method of contactless brush seal according to claim 4, is characterized in that, described in step 4, forward and backward baffle plate material is 316L stainless steel, and described front screen thickness is 0.8-1mm, and described backboard thickness is 0.5-0.6mm.
8. the making method of contactless brush seal according to claim 4, is characterized in that, technological requirement described in step 5 is that the effective arc length of steam seal ring segmental arc adds 20-30mm machining allowance.
9. the making method of contactless brush seal according to claim 4, it is characterized in that, welding method described in step 6 is laser bonding: the laser beam that utilizes high-energy-density is fused into forward and backward baffle plate and brush silk as thermal source and is made into integration brush strip of paper used for sealing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410131778.6A CN103883363B (en) | 2014-04-02 | 2014-04-02 | A kind of contactless brush seal and preparation method thereof |
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| CN201410131778.6A CN103883363B (en) | 2014-04-02 | 2014-04-02 | A kind of contactless brush seal and preparation method thereof |
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| CN103883363B CN103883363B (en) | 2015-10-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104454030A (en) * | 2014-11-14 | 2015-03-25 | 中国航空动力机械研究所 | High-pressure-resisting low-hysteresis brush type sealing device |
| CN105562885A (en) * | 2016-02-19 | 2016-05-11 | 江苏拓平密封科技有限公司 | Brush type sealing welding method based on cobalt powder seam filling and 3D printing technology |
| CN106194279A (en) * | 2016-08-27 | 2016-12-07 | 朱艳君 | The axially mounted brush steam seal of steam turbine |
| CN107542505A (en) * | 2017-08-02 | 2018-01-05 | 哈尔滨汽轮机厂有限责任公司 | A kind of turbine rotor installs gland sealing gear method |
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| CN107542505A (en) * | 2017-08-02 | 2018-01-05 | 哈尔滨汽轮机厂有限责任公司 | A kind of turbine rotor installs gland sealing gear method |
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| Publication number | Publication date |
|---|---|
| CN103883363B (en) | 2015-10-28 |
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Address after: 210046, Nanjing District, Jiangsu City, Qixia Province, Gan home, 108 East, Nanjing Golden Port (state) Science Park 6 Applicant after: Jiangsu Turbine Seal High-Technology Co., Ltd. Address before: 210046, Nanjing District, Jiangsu City, Qixia Province, Gan home, 108 East, Nanjing Golden Port (state) Science Park 6 Applicant before: Jiangsu Turbine Seal High-Technology Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: JIANGSU TURBINE SEAL HIGH-TECHNOLOGY CO., LTD. TO: JIANGSU TURBINE SEAL HIGH-TECHNOLOGY CO., LTD. |
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Inventor after: Shen Xiannian Inventor after: Zuo Fei Inventor after: Xu Xiuqin Inventor after: Wang Wanlun Inventor before: Shen Xiannian Inventor before: Xu Xiuqin Inventor before: Wang Wanlun |
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Free format text: CORRECT: INVENTOR; FROM: SHEN XIANNIAN XU XIUQIN WANG WANLUN TO: SHEN XIANNIAN ZUO FEI XU XIUQIN WANG WANLUN |
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Effective date of registration: 20170509 Address after: 116600 No. 723, block B, Taihua Hotel, Dalian Free Trade Zone, Liaoning Patentee after: Dalian Free Trade Zone Huahong Industrial Technology Co., Ltd. Address before: 210046, Nanjing, Qixia District, Jiangsu Province, Gan home East 108, Nanjing Golden Port (state) science and Technology Park 6 Patentee before: Jiangsu Turbine Seal High-Technology Co., Ltd. |
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