CN203756241U - Compound ring brush type vapor seal - Google Patents
Compound ring brush type vapor seal Download PDFInfo
- Publication number
- CN203756241U CN203756241U CN201320760585.8U CN201320760585U CN203756241U CN 203756241 U CN203756241 U CN 203756241U CN 201320760585 U CN201320760585 U CN 201320760585U CN 203756241 U CN203756241 U CN 203756241U
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- Prior art keywords
- ring
- brush
- labyrinth
- slide
- composition
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Abstract
The utility model relates to a compound ring brush type vapor seal. The compound ring brush type vapor seal is characterized by being formed by connecting four or more sections of vapor seal bodies (2) end to end, wherein each of the vapor seal bodies (2) comprises a high-tooth sealing strip (3), a low-tooth sealing strip (30), a wearable compound ring (1) and an embedded vapor seal ring (4) or a sliding vapor seal ring (40). The high-tooth sealing strip or/and the low-tooth sealing strip on the existing vapor seal ring are changed into an embedded sealing brush strip or a sliding sealing brush strip, and meanwhile, a low tooth is changed into the wearable compound ring, so that the compound ring brush type vapor seal provided by the utility model has the advantages of good sealing property, simple and reasonable structure, and the like, and is especially fit for the replacing and upgrading of dynamic seal of the present turbine.
Description
Technical field
The utility model is a kind of seal arrangement being applied in power industry, is particularly applicable to the composition ring brush steam seal that the large rotor machinery such as the steam turbine sealing of thermal power generation corporations is used, and belongs to the seal arrangement of steam turbine.
Background technique
Tenth Five-Year Plan Period, Chinese construction of fire and electricity project development was swift and violent.In year August calendar year 2001 to 2005, reach 472 through the thermoelectricity project of State Environmental Protection Administration examination & approval, and electric motor power reaches 344382MW, wherein 135 of examination and approval projects in 2004, and electric motor power 107590MW, increases by 207% than last year; 2005 1 to August, 213 of examination and approval projects, and electric motor power 168546MW, increases by 420% on a year-on-year basis.If these thermoelectricity projects are all gone into operation, how transforming when the time comes and then improving economic performance is the realistic problem of pendulum in face of corporate decision maker.
Affect turbine efficiency, the economic factor such as coal consumption and the steam consumption is a lot, wherein steam turbine is through-flow moving, the leakage of stator blade packing and shaft seal is the major reason that causes turbine efficiency to reduce, along with the development of high parameter large capacity turbine, start at steam turbine, in shutdown and varying duty process, due to the each component materials of steam turbine, structure, the difference of steam and metal heat transfer condition, cause the thermal stress of parts, thermal expansion and thermal distortion, relative the transfiniting that cylinder and rotor will occur causes shaft seal place rub between rotor and stator with the thermal distortion of cylinder rotor, cause that because gap regudation of steam sealing is improper rub between rotor and stator causes the example of the bending accident of steam turbine main shaft not rarely seen.
For the safe operation of unit, gap regudation of steam sealing is generally got the upper limit of manufactory's specified value, even larger, this just must affect the efficiency of unit, cause that lubricated oil worsens simultaneously, cause speed control system corrosion bite, in generator, hydrogen humidity increases, and unit safety economical operation in serious threat.As can be seen here, the improvement potentiality of steam turbine are very large.
The sealing technique that the each position of steam turbine through-flow system in modern thermal power plant adopts is comb-shaped structure, main as controlling leakage rate.Its working principle is that gas passes through repeatedly throttling expansion of capacitor, step-down, heat exchanging process generation damping function, reduces and leaks.In when assembling, the spring compression of labyrinth ring by being placed on packing segment back be to design attitude, and due to the mill that touches of gland sealing gear and rotor, makes that gland sealing gear is easy to wear, gap large, leaks greatly, flow-induced vibration in sealed chamber easily causes that rotor shakes.In recent years, along with the development of technology is from the external various new packing of having introduced, comparatively typical as: contact-type packing, side tooth packing, Honeycomb steam seal etc., but still exist sealing effect bad, easy to wear, easily produce the deficiencies such as flow-induced vibration.
Summary of the invention
The purpose of this utility model is the deficiency in order to overcome above-mentioned existing steam seal ring, a kind of composition ring brush steam seal is provided, play good sealing effect, thereby reduced the leakage of gas, realize energy-saving and cost-reducing, the hear rate of unit is significantly reduced, improve the utilization efficiency of unit, eliminated the defect that affects unit safety reliable operation, reduce the expense of operating maintenance, extending unit working life, is to be applicable to the particularly sealing of steam turbine of large rotor machinery.
The technical solution of the utility model is:
A kind of composition ring brush steam seal, it is more than or equal to labyrinth casing 2 end-to-ends of 4 sections by quantity and forms, described labyrinth casing 2 comprises high tooth Stamping Steel Ribbon 3, low tooth Stamping Steel Ribbon 30, can grind composition ring 1, inserted labyrinth ring 4 or slide-in type labyrinth ring 40, described composition ring 1, high tooth Stamping Steel Ribbon 3 and the low tooth Stamping Steel Ribbon 30 of grinding is arranged on labyrinth casing 2 bottoms, and inserted labyrinth ring 4 or slide-in type labyrinth ring 40 are arranged between high tooth Stamping Steel Ribbon 3 and low tooth Stamping Steel Ribbon 30.
Described inserted labyrinth ring 4 is by front panel 41, rear board 43 and be clipped in after refractory alloy between the two brush silk 42 welds by high-power electron beam and form, and front panel 41 and rear board 43 are embedded in labyrinth casing 2.
Described slide-in type labyrinth ring 40 is slidably connected by slide-in type fixed base 44 and labyrinth casing 2, is inlaid with by front panel 41, rear board 43 and the refractory alloy brush silk 42 that is clipped between the two and weld the labyrinth ring forming afterwards by high-power electron beam in slide-in type fixed base 44.
Described material of grinding composition ring 1 is nonmetal multi-element composite material.
The labyrinth clearance of described composition ring brush steam seal is in 0.05-0.10mm left and right.
Described refractory alloy brush silk 42 is by directly through being that 0.05～0.2mm, hardness are not less than the high-temperature alloy silk that 80HB, tensile strength be not less than 800Mpa and form, and its thickness is not less than 1.5 ㎜.
The arrangement angle of described refractory alloy brush silk 42 is 20～60 degree.
The described composition ring 1 that grinds is provided with brush ring spring 5.
Described slide-in type fixed base 44 is provided with slide-in type brush ring spring 50.
Composition ring brush steam seal arc segment structure of the present utility model and traditional brush steam seal segmental arc are basic identical, low tooth changes into and can grind composition ring together, composition ring material is a kind of nonmetal multi-element composite material of self-developing development, the characteristics such as that this kind of material has is wear-resisting, oil resistant, high temperature resistant, ageing-resistant, resistance to chemical attack, and there is self-lubricating function.It can directly contact with rotating shaft, and due to the effect of accurate limit stoper, the pressure of countershaft is subject to the control of mechanics chain simultaneously, therefore can not cause rotating shaft heating, mill axle phenomenon, can not cause shafting vibration yet, can keep contacting and stable operation all the time with axle, guarantee sealing effect.
Brush ring employing is inlayed or the mode of slide-in type is arranged in labyrinth casing.And brush silk adopts specialty metal silk, when ensureing sealing, can not hurt again rotor.In order to ensure sealing, ductility and the necessary mechanical strength of brush, described brush silk layer is selected directly through being that 0.08～0.15mm, hardness are the high-temperature alloy silk that 85HB, its anti-tear tensile strength are 850Mpa, become to form by set angle close-packed arrays, its total thickness is 0.6-2mm.In order to reduce the rotational resistance of countershaft, the optimal arrangement angle of described high-temperature alloy silk is 30～60 degree.But not can being adjusted to former gland sealing gear by radial clearance, Metal Contact tooth cannot reach the radial clearance of 0.05-0.10mm, this has effectively been prevented high-quality steam leak outside and the air in steam turbine outside to steam turbine internal leakage, ensure that turbine vacuum system has good vacuum, has both ensured the efficiency of steam turbine.
Beneficial effect of the present utility model is:
Composition ring brush steam seal of the present utility model, owing to changing insert seal brush bar or slide-in type sealing brush bar into by the high tooth Stamping Steel Ribbon together on existing labyrinth ring or with low tooth Stamping Steel Ribbon, low tooth changes into and can grind composition ring together simultaneously, composition ring material is a kind of nonmetal multi-element composite material of self-developing development, the characteristics such as that this kind of material has is wear-resisting, oil resistant, high temperature resistant, ageing-resistant, resistance to chemical attack, and there is self-lubricating function.After unit operation is stable, labyrinth clearance is less than design load even can reach zero clearance, and the brush ring of brush steam seal is made up of compact arranged extraordinary fine wire, every one metal wire be exactly one end be the beam of fulcrum, have fabulous elasticity.In the time that brush silk and rotor are collided mill, brush silk effective elasticity is made a concession, and is difficult for being worn, and has ensured unit even safe operation under zero clearance in little gap.Even if when unit is crossed critical speed of rotation or variable parameter operation, it is but not easy to wear that brush silk can be followed axle yielding, after treating stable operation of unit, under the through-flow agitation of steam flow, can recover again primary clearance, thereby effectively ensure good sealability.And conventional rigid gland sealing gear is as long as will grind off very soon with rotor grazing, form permanent leakage way, increase leakage rate.Because bristle produces various flowing under steam flow effect, produce damping function again, consumed the energy of gas, reduced the temperature and pressure of vapour (gas) body, played selfsealings effect, reduce thereby reach the object that gas leaks.
The Steam loss that experiment showed, composition ring brush steam seal of the present utility model is only 10%～20% of former serrate-type steam seal.The own intensity of strength ratio wire after welding is taller, can not fall the phenomenons such as silk.Have good seal performance and the advantage such as simple and reasonable, the speed that this brush steam seal sample can bear exceedes 305 meter per seconds, and heatproof can reach more than 690 DEG C, can long-term, stable, safe operation.Can be applicable to large rotor machinery and do motive sealing use, be particularly suitable for that the motive sealing of existing steam turbine is changed to upgrading and use.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment's one of composition ring brush steam seal of the present utility model embedded brush bar;
Fig. 2 is the structural representation of the embodiment's two of composition ring brush steam seal of the present utility model slide-in type brush bar.
In figure: the 1st, can grind composition ring, the 2nd, labyrinth casing, the 3rd, high tooth Stamping Steel Ribbon, 30 is low tooth Stamping Steel Ribbon, the 4th, inserted labyrinth ring, the 40th, slide-in type labyrinth ring, the 41st, front panel, the 42nd, refractory alloy brush silk, the 43rd, rear board, 44 slide-in type fixed bases, the 5th, brush ring spring, the 50th, slide-in type brush ring spring.
Embodiment
Accompanying drawing is non-limiting discloses several specific embodiment of the present utility model, is further described by reference to the accompanying drawings as follows.
Embodiment one.
Referring to Fig. 1, shown in Fig. 1, adopt the structural representation of embedded brush bar for composition ring brush steam seal, a kind of composition ring brush steam seal, it is more than or equal to labyrinth casing 2 end-to-ends of 4 sections by quantity and forms, described labyrinth casing 2 comprises high tooth Stamping Steel Ribbon 3, low tooth Stamping Steel Ribbon 30, can grind composition ring 1, inserted labyrinth ring 4 or slide-in type labyrinth ring 40, described composition ring 1, high tooth Stamping Steel Ribbon 3 and the low tooth Stamping Steel Ribbon 30 of grinding is arranged on labyrinth casing 2 bottoms, and inserted labyrinth ring 4 is arranged between high tooth Stamping Steel Ribbon 3 and low tooth Stamping Steel Ribbon 30.
Described inserted labyrinth ring 4 is by front panel 41, rear board 43 and be clipped in after refractory alloy between the two brush silk 42 welds by high-power electron beam and form, and front panel 41 and rear board 43 are embedded in labyrinth casing 2.
Described material of grinding composition ring 1 is nonmetal multi-element composite material.The labyrinth clearance of described composition ring brush steam seal is in 0.05-0.10mm left and right.Described refractory alloy brush silk 42 is by directly through being that 0.05～0.2mm, hardness are not less than the high-temperature alloy silk that 80HB, tensile strength be not less than 800Mpa and form, and its thickness is not less than 1.5 ㎜.The arrangement angle of described refractory alloy brush silk 42 is 20～60 degree.The described composition ring 1 that grinds is provided with brush ring spring 5.
Embodiment two.
Referring to Fig. 2, shown in Fig. 2, adopt the structural representation of slide-in type brush bar for composition ring brush steam seal, a kind of composition ring brush steam seal, it is more than or equal to labyrinth casing 2 end-to-ends of 4 sections by quantity and forms, described labyrinth casing 2 comprises high tooth Stamping Steel Ribbon 3, low tooth Stamping Steel Ribbon 30, can grind composition ring 1, inserted labyrinth ring 4 or slide-in type labyrinth ring 40, described composition ring 1, high tooth Stamping Steel Ribbon 3 and the low tooth Stamping Steel Ribbon 30 of grinding is arranged on labyrinth casing 2 bottoms, and slide-in type labyrinth ring 40 is arranged between high tooth Stamping Steel Ribbon 3 and low tooth Stamping Steel Ribbon 30.
Described slide-in type labyrinth ring 40 is slidably connected by slide-in type fixed base 44 and labyrinth casing 2, is inlaid with by front panel 41, rear board 43 and the refractory alloy brush silk 42 that is clipped between the two and weld the labyrinth ring forming afterwards by high-power electron beam in slide-in type fixed base 44.
Described material of grinding composition ring 1 is nonmetal multi-element composite material.The labyrinth clearance of described composition ring brush steam seal is in 0.05-0.10mm left and right.Described refractory alloy brush silk 42 is by directly through being that 0.05～0.2mm, hardness are not less than the high-temperature alloy silk that 80HB, tensile strength be not less than 800Mpa and form, and its thickness is not less than 1.5 ㎜.The arrangement angle of described refractory alloy brush silk 42 is 20～60 degree.The described composition ring 1 that grinds is provided with brush ring spring 5.Described slide-in type fixed base 44 is provided with slide-in type brush ring spring 50.
Difference shown in composition ring brush steam seal of the present utility model (slide-in type brush bar) its structure and Fig. 1 is the means of fixation of brush ring, and this structure adopts the mode of slide-in type to fix.Low tooth changes into and can grind composition ring together.
In above-described embodiment, in order to ensure sealing, ductility and the necessary mechanical strength of brush, the metal wire layer of described brush is selected directly through being that 0.08～0.15mm, hardness are the high-temperature alloy silk that 85HB, its anti-tear tensile strength are 850Mpa, become to form by set angle close-packed arrays, its total thickness is 0.6-2mm.In order to reduce the rotational resistance of countershaft, the optimal arrangement angle of described high-temperature alloy silk is 30～60 degree.In addition, nonmetal Contact Tooth can be adjusted to former gland sealing gear by radial clearance and cannot reach the radial clearance of 0.05-0.10mm.This has effectively been prevented high-quality steam leak outside and the air in steam turbine outside to steam turbine internal leakage, ensure that turbine vacuum system has good vacuum, has both ensured the efficiency of steam turbine.
Claims (7)
1. a composition ring brush steam seal, it is characterized in that it is more than or equal to labyrinth casing (2) end-to-end of 4 sections by quantity and forms, described labyrinth casing (2) comprises high tooth Stamping Steel Ribbon (3), low tooth Stamping Steel Ribbon (30), can grind composition ring (1), inserted labyrinth ring (4) or slide-in type labyrinth ring (40), described composition ring (1), high tooth Stamping Steel Ribbon (3) and the low tooth Stamping Steel Ribbon (30) of grinding is arranged on labyrinth casing (2) bottom, and inserted labyrinth ring (4) or slide-in type labyrinth ring (40) are arranged between high tooth Stamping Steel Ribbon (3) and low tooth Stamping Steel Ribbon (30); Described inserted labyrinth ring (4) is by front panel (41), rear board (43) and be clipped in after refractory alloy between the two brush silk (42) welds by high-power electron beam and form, and front panel (41) and rear board (43) are embedded in labyrinth casing (2); Described slide-in type labyrinth ring (40) is slidably connected by slide-in type fixed base (44) and labyrinth casing (2), is inlaid with by front panel (41), rear board (43) and the refractory alloy brush silk (42) that is clipped between the two and welds the labyrinth ring forming afterwards by high-power electron beam in slide-in type fixed base (44).
2. composition ring brush steam seal as claimed in claim 1, is characterized in that the described material that can grind composition ring (1) is nonmetal multi-element composite material.
3. composition ring brush steam seal as claimed in claim 1, is characterized in that the labyrinth clearance of described composition ring brush steam seal is in 0.05-0.10mm left and right.
4. composition ring brush steam seal as claimed in claim 1, it is characterized in that described refractory alloy brush silk (42) by directly through being that 0.05～0.2mm, hardness are not less than the high-temperature alloy silk that 80HB, tensile strength be not less than 800Mpa and form, its thickness is not less than 1.5 ㎜.
5. composition ring brush steam seal as claimed in claim 4, the arrangement angle that it is characterized in that described refractory alloy brush silk (42) is 20～60 degree.
6. composition ring brush steam seal as claimed in claim 1, can grind composition ring (1) described in it is characterized in that
Be provided with brush ring spring (5).
7. composition ring brush steam seal as claimed in claim 1, is characterized in that described slide-in type fixed base (44) is provided with slide-in type brush ring spring (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760585.8U CN203756241U (en) | 2013-11-27 | 2013-11-27 | Compound ring brush type vapor seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760585.8U CN203756241U (en) | 2013-11-27 | 2013-11-27 | Compound ring brush type vapor seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203756241U true CN203756241U (en) | 2014-08-06 |
Family
ID=51251528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320760585.8U Expired - Fee Related CN203756241U (en) | 2013-11-27 | 2013-11-27 | Compound ring brush type vapor seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203756241U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005772A (en) * | 2019-11-29 | 2020-04-14 | 安徽节源环保科技有限公司 | Servo suspension tooth brush type steam seal of steam turbine unit |
-
2013
- 2013-11-27 CN CN201320760585.8U patent/CN203756241U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005772A (en) * | 2019-11-29 | 2020-04-14 | 安徽节源环保科技有限公司 | Servo suspension tooth brush type steam seal of steam turbine unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20211127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |