CN105673091B - A kind of seal clearance selfregulated glandpacking device with gas suspension effect - Google Patents
A kind of seal clearance selfregulated glandpacking device with gas suspension effect Download PDFInfo
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- CN105673091B CN105673091B CN201610029922.4A CN201610029922A CN105673091B CN 105673091 B CN105673091 B CN 105673091B CN 201610029922 A CN201610029922 A CN 201610029922A CN 105673091 B CN105673091 B CN 105673091B
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- 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
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Devices (AREA)
Abstract
A kind of seal clearance selfregulated glandpacking device with gas suspension effect, including multiple packing segmental arcs, auxiliary seal bar and the spring being located between packing segmental arc；Packing segmental arc is provided with gland sealing gear；Gland sealing gear cooperatively forms seal clearance with rotor surface, and high-pressure side packing backlash is more than low-pressure side packing backlash；Packing segmental arc centre position sets high pressure steaming groove and low pressure steaming groove respectively, and packing segmental arc back cavity is respectively communicated with high-pressure side and low-pressure side, and high steam and low-pressure steam are obstructed by auxiliary seal bar.Seal clearance selfregulated glandpacking of the present invention with gas suspension effect is not only realized changes seal clearance automatically according to steam turbine start and stop and normal operation two states; and can be in real time according to the position adjust automatically seal clearance of rotor; remain running status seal clearance within scope of design; good sealing property is kept for a long time; and have the function of reducing shafting vibration amplitude concurrently, the security and economy of steam turbine operation can be improved comprehensively.
Description
Technical field
The present invention relates to a kind of seal clearance selfregulated glandpacking device with gas suspension effect, belong to turbine steam seal
Field.
Background technology
Steam turbine is as one of the three big main equipments in thermal power plant, and its efficiency largely affects the economic effect of power plant
Benefit, by equipment technology reconstruction and improving unit operation mode, to improve unit operation efficiency as effective way.Steam turbine leads to
Stream part design, manufacturing technology become better and approaching perfection day by day, and the principal element that leakage losses has turned into restriction turbine efficiency raising (accounts for whole machine
Organize more than the 60% of through-flow efficiency losses), so lifting packing performance, reduces the through-flow leakage losses of steam turbine, to improving machine
Group operational efficiency is most important.
In the prior art, broach packing is the seal system being most widely used.The axial width one of single track broach packing
As be designed as no more than 60mm, corresponding equivalent tooth number is not more than 10, and (for stage teeth packing, a high tooth is designated as one and worked as
Tooth is measured, the low tooth between two high teeth is also denoted as an equivalent tooth, further illustrates, no matter the low tooth between two high teeth has many
Few is all designated as an equivalent tooth), realized and be progressively depressured by axially upper multiple gland sealing gears, to reduce leakage.
The outstanding advantages of broach packing are with low cost, relatively stablized using safety, sealing effectiveness, but this stabilization is low water
Flat stabilization.Broach packing need to typically reserve 0.5~0.8mm radial clearances when installing, and nonetheless, can not still avoid steamer
The excessive abrasion that critical speed amplitude increases, the heated inequality of cylinder causes the factors such as deformation to be brought is crossed in machine shutdown process, once
Mill is touched, gap permanently expands.For many years, how to reduce and keep less labyrinth clearance to turn into and perplex those skilled in the art
Problem.
Steam turbine operation has its particularity, research report in recent years, such as China Huadian Electric Research Institute and Shanghai steamer
Machine factory co-publicates《Each position novel steam seal selecting type scheme research of steam turbine》Point out：" outlet of packing is can be according to vapour
Take turns the change of operating states of the units and change labyrinth clearance.The packing for comparing science should be according to Steam Turbine start and stop and normal fortune
Row two states, change labyrinth clearance automatically, while safety clearance and economic gap needed for meeting respectively under two states.One
As for, Turbine Safety gap is 3~5 times of economic gap.”
《Steam turbine set steam sealing type selecting best of breed draft normization is studied》In one text, also draw as drawn a conclusion：
| State | Duration | To clearance requirement | Purpose |
| Start and stop state | It is of short duration | Each position dynamic and static gaps should keep larger safety clearance | Smooth start and stop |
| Grid-connected state | For a long time | Each position dynamic and static gaps should keep less economic gap | Economical and efficient is run |
In the prior art, the typical technology that can realize the whole characteristic of above-mentioned clearance self-regulating is brandon steam-glanding technology.Bu Lai
The spring leaf that packing eliminates traditional broach packing back is stepped on, the substitute is and at least installed in every circle packing segmental arc end
Four circumferential bolt springs, and mill out one at each packing segmental arc back and enter vapour groove, make the pressure at packing segmental arc back approximate
Equal to upstream high lateral pressure.In the steam turbine start and stop stage, packing upstream and downstream pressure difference is smaller, in the presence of circumferential spring,
Packing is in complete open configuration, and larger safety clearance, generally 2~4mm are kept between packing and rotor；In steam turbine just
Normal running status, packing upstream and downstream pressure difference increase produces one by entering vapour groove into the steam at packing segmental arc back larger centripetal
Closing force, packing is closed therewith, and less economic gap, generally 0.3~0.5mm, Jin Ershi are kept between packing and rotor
It is existing efficient sealed.
However, being passed different judgements on to the practical application effect of brandon steam-glanding in the industry, it is considered that brandon steam-glanding may be deposited
The problem of at least include：1st, spring-mass problem；2nd, packing segmental arc can not fully come together；3rd, after brandon steam-glanding closure, still
So exist and once touch the problem of mill gap permanently expands similar to traditional broach packing.
In addition, steam flow excitation easily occurs on turbine high-pressure rotor.Existing research shows that seal steam exciting force is
Cause the main cause of above-mentioned phenomenon.Because the dynamic of rotor is eccentric, cause steam pressure in packing circumferentially distributed uneven, and
With the circumferential flow of steam, making a concerted effort perpendicular to rotor eccentricity direction is produced, promotes rotor eddy, gently then causes gland sealing gear to touch
Mill, increases seal leakage, heavy then cause rotor unstability, the safe operation of serious threat unit.
The content of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of sealing with gas suspension effect
The whole sealing gland of clearance self-regulating.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows：
A kind of seal clearance selfregulated glandpacking device with gas suspension effect, including multiple packing segmental arcs, auxiliary are close
Strip of paper used for sealing and the spring being located between packing segmental arc；Packing segmental arc is provided with gland sealing gear, and total yield tooth number is no less than 10；Packing
Tooth cooperatively forms seal clearance with rotor surface, and high-pressure side packing backlash is more than low-pressure side packing backlash；In packing segmental arc
Between position set high pressure steaming groove and low pressure steaming groove respectively, packing segmental arc back cavity is respectively communicated with high-pressure side and low-pressure side, high
Pressure steam and low-pressure steam are obstructed by auxiliary seal bar.
As the conventional conception of this area, packing segmental arc is radially included hangers, the neck connected successively by outer ring to inner ring
Neck, packing matrix and gland sealing gear, the outer peripheral surface of hangers are referred to as carrying on the back arc greatly, and the inner surface of hangers is (i.e. with packing matrix phase pair
Face) it is referred to as small back of the body arc；Using when, the hangers of above-mentioned packing coordinates with the wider part of stator T-slot, above-mentioned neck and stator T
The narrower part of type groove coordinates；Packing segmental arc back cavity refers to the cavity that hangers is cooperatively formed with stator T-slot.
The packing number of teeth of the above-mentioned seal clearance selfregulated glandpacking with gas suspension effect is more, axial width is wider,
Be mainly used between steam turbine high pressure pass a bridge, speed governing level leaf top, high pressure first stage dividing plate, the pressure difference before and after packing such as on the inside of shaft end
Higher position, because pressure difference is higher before and after packing, in order to reduce leakage rate, these positions need to design more gland sealing gears,
For active service unit, these positions are generally designed the traditional broach packing of multiple tracks, and installing space is accordingly larger.Therefore, it is of the invention
The alternative traditional multiple tracks packing of single track packing, and keep the packing number of teeth and axial space-consuming constant.It is preferred that, improvement project
In, single track packing of the present invention substitutes the traditional packing of twice.
The gland sealing gear of the above-mentioned seal clearance selfregulated glandpacking with gas suspension effect includes high-pressure side gland sealing gear and low
Press side gland sealing gear.The differentiation of " high pressure " and " low pressure " is that, using auxiliary seal bar as boundary, auxiliary seal bar upstream is defined as height
Side is pressed, auxiliary seal bar downstream is defined as low-pressure side.Above-mentioned high-pressure side, packing segmental arc back of the body arc (extrados) pressure is more than packing base
Internal wall (intrados) pressure, therefore produce the closing force for pointing to rotor surface；Above-mentioned low-pressure side, packing segmental arc back of the body arc (outer arc
Face) pressure is less than packing matrix inwall (intrados) pressure, therefore produce the opening force away from rotor surface.Above-mentioned closing force and
The relative size of opening force depends primarily on the axial width and high-pressure side gland sealing gear and low-pressure side vapour of high-pressure side and low-pressure side
The pressure difference that envelope tooth each undertakes.Above-mentioned high-pressure side axial width is more than low-pressure side axial width, above-mentioned high-pressure side gland sealing gear number
More than low-pressure side gland sealing gear number, and high-pressure side packing backlash is all higher than low-pressure side packing backlash, preferably differ 0.1~
0.8mm.When packing backlash is larger, such as high-pressure side packing backlash is 2.2mm, and low-pressure side packing backlash is 2mm, then
The ratio of high-pressure side packing backlash and low-pressure side packing backlash is close to 1；When gland sealing gear gap shrinks, high-pressure side gland sealing gear
Gap is identical with low-pressure side gland sealing gear gap shrinks value, and such as high-pressure side packing backlash is 0.3mm, and low-pressure side packing backlash is
0.1mm, but the ratio of high-pressure side packing backlash and low-pressure side packing backlash will be changed into 3.Just because of high-pressure side gland sealing gear
Significant changes occur for the ratio in gap and low-pressure side packing backlash, just cause high-pressure side gland sealing gear and low-pressure side gland sealing gear each
Significant changes occur for the pressure difference undertaken.Therefore, for the packing of the present invention of fixed structure, above-mentioned closing force and opening force it is relative
Size changes and significant changes with packing backlash.Under a certain gland sealing gear gap condition, above-mentioned closing force and opening force
Sizableness, this gap is design seal clearance.If current seal clearance is noticeably greater than design seal clearance, closing force is long-range
In opening force, packing of the present invention will be automatic close to rotor surface, reduce seal clearance to reduce leakage；If current seal clearance shows
Write and be less than design seal clearance, opening force is much larger than closing force, packing of the present invention will be automatic away from rotor surface, expand gap with
Avoid touching mill.Exactly above-mentioned this characteristic, can guarantee that packing segmental arc is suspended in rotor surface all the time, both will not be because of seal clearance mistake
Increase leakage greatly, again will not be because seal clearance is too small and produces and touches mill.
Further illustrate, due to packing segmental arc under differential pressure action also by larger axial thrust, closer or far from turning
Sublist face is both needed to the stiction for overcoming axial thrust to cause, only when above-mentioned closing force and opening force make a concerted effort be more than static friction
During power, packing segmental arc could realize self-adjusting.In addition, this characteristic adds the stability of packing segmental arc, it is to avoid labyrinth clearance
Frequently adjustment.
Because change and the holding of packing seal clearance of the present invention are stressed driving, when steam turbine is in start and stop shape
Too small without pressure difference or pressure difference before and after state or extremely low load condition, packing segmental arc, the relative position of packing segmental arc and rotor will be main
It is affected by gravity, partially sealed gap can be caused too small, it is possible to create touch mill.In order to avoid start and stop stage and extremely low load rank
Section packing touches mill with rotor, and spring is set up between packing segmental arc, initial labyrinth clearance is kept maximum.
The above-mentioned spring being located between packing segmental arc is spiral compression spring or arc leaf spring.It is preferred that, it is located at packing
Spring between segmental arc is arc leaf spring.By the high-temperature alloy sheet material from suitable thickness, it is easy to manufacture satisfaction and sets
Count desired arc leaf spring.
The above-mentioned board-like Spring Card of arc is connected on the end face of packing segmental arc.Installation and debugging for convenience, arc leaf spring is used
Screw is fixed, and prevents from coming off.
Above-mentioned arc leaf spring is flushed with the low tooth of gland sealing gear substantially close to the edge of rotor, but not higher than low tooth.Adopt
Above-mentioned design is used, arc leaf spring also acts as the effect of barrier steam circumferential flow, is conducive to provide more stable
Closing force and opening force, moreover it is possible to suppress steam flow excitation, reduce shafting vibration amplitude.
Applicant it has been investigated that, when rotor is eccentric with respect to steam seal ring due to whirling motion, rotor surface is by due to pressure difference
Effect is produced, so as to reduce vibration, improves turbine shafting with rotor eccentricity radial load in opposite direction, increase shafting damping
Stability.
It is preferred that, the above-mentioned high-pressure side gland sealing gear gap-ratio low-pressure side packing big 0.1~0.8mm in backlash, and high-pressure side is some
Gland sealing gear flows to seal clearance along steam flow and is gradually reduced, and some gland sealing gears of low-pressure side flow to seal clearance along steam flow and keep constant.
Using above-mentioned design, working characteristics influence of the factor such as mismachining tolerance, peace tuningout difference on packing of the present invention is minimum.
Leaked to reduce packing back of the present invention high steam to low-pressure side, above-mentioned auxiliary seal bar at least includes setting
Sealed in the c-type of packing neck medial surface, c-type sealing opening is connected with high-pressure side, from swelling under differential pressure action, realizes good
Good sealing.
Further to improve the reliability of packing back seal, auxiliary seal bar also includes being arranged on packing hangers medial surface
O-shaped sealing, open aperture on the inside of O-shaped sealing, once there is high steam entrance, from swelling under differential pressure action, realize good close
Envelope.Above-mentioned c-type sealing and O-shaped sealing role are essentially identical, employ the theory of Redundancy Design, improve the reliability of sealing
Property.
Installation and debugging for convenience, above-mentioned c-type sealing is divided into multiple segmental arcs, and one c-type of each packing segmental arc correspondence is close
Seal on the inside of segmental arc, and c-type sealing mounting groove and riveting groove is set, for fixing c-type sealing segmental arc.
Installation and debugging for convenience, it is above-mentioned it is O-shaped sealing be divided into two semicircles, be individually positioned in above and below cylinder T-slot
It is interior, crimped with the medial surface of packing hangers.
Above-mentioned high pressure steaming groove and low pressure steaming groove are generally located on the circumferentially intermediate position of packing segmental arc, and concrete shape is not
Limit, as long as packing upstream and downstream can be respectively communicated with, but the steaming groove circulation area cooperatively formed with T-slot need to be ensured at least
Up to 50mm2。
The NM technology of the present invention is with reference to prior art.
Seal clearance selfregulated glandpacking of the present invention with gas suspension effect is not only realized according to steam turbine start and stop
Change seal clearance automatically with normal operation two states, and energy is in real time according to the position adjust automatically seal clearance of rotor,
Remain that running status seal clearance keeps good sealing property within scope of design, for a long time, and have reduction shafting concurrently
The function of vibration amplitude, the security and economy of steam turbine operation can be improved comprehensively.
Brief description of the drawings
Fig. 1 is the schematic diagram that the packing of the embodiment of the present invention 1 is in open configuration under the board-like spring effect of arc.
Fig. 2 is the schematic diagram that the packing of the embodiment of the present invention 1 is in closure state under differential pressure action.
Fig. 3 is the structural representation of the packing segmental arc of the embodiment of the present invention 1.
Fig. 4 is the packing segmental arc end face partial structural diagram of the embodiment of the present invention 1.
Fig. 5 is the three-view diagram of the arc leaf spring of the embodiment of the present invention 1.
Fig. 6 is the radial direction sectional schematic diagram that the packing of the embodiment of the present invention 1 coordinates with turbine rotor and stator.
Closing force and opening force are relatively large under the packing open configuration that Fig. 7 uses area-method to represent for the embodiment of the present invention 1
Logotype.
Fig. 8 is along axle when the high-pressure side packing backlash of the embodiment of the present invention 1 is different from the ratio of low-pressure side packing backlash
To the between cog static pressure changing trend diagram of (steam flow direction), as ratio increases, closing force is substantially reduced, and opening force is notable
Increase.
Fig. 9 is graph of a relation of the low-pressure side packing backlash of the embodiment of the present invention 1 with closing (closing force-opening force) with joint efforts.
Figure 10 is the radial direction sectional schematic diagram that the packing of the embodiment of the present invention 2 coordinates with turbine rotor and stator.
In above-mentioned each figure, 1 is packing segmental arc, and 2 be rotor surface, and 3 be arc leaf spring, and 4 be screw, and 5 is logical for high pressure
Vapour groove, 6 be low pressure steaming groove, and 7 be c-type sealing, and 8 be stator, and 9 be rotor, and 10 be O-shaped sealing, and 11 be closing that area-method is represented
Size, the 12 opening force sizes represented for area-method with joint efforts；H is high-pressure side, and L is low-pressure side；F1 is closure force direction (along rotor
Radially and close to the direction of rotor surface), F2 is opens force direction (along rotor radial and direction away from rotor surface), and F3 is
Axial thrust direction (along rotor axial), f is direction (along rotor radial, closer or far from the direction of rotor surface)；a
The pressure of (steam flow direction) vertically when for the ratio of high-pressure side packing backlash and low-pressure side packing backlash being 2.5/2.3
Trendline drops, (steam stream vertically that b is high-pressure side packing backlash with the ratio of low-pressure side packing backlash when being 0.8/0.6
Dynamic direction) pressure drop Trendline, c is edge when the ratio of high-pressure side packing backlash and low-pressure side packing backlash is 0.4/0.2
The pressure drop Trendline of axial direction (steam flow direction), d is that the ratio of high-pressure side packing backlash and low-pressure side packing backlash is
The pressure drop Trendline of (steam flow direction) vertically when 0.3/0.1, e is high-pressure side packing backlash and low-pressure side packing between cog
The pressure drop Trendline of (steam flow direction) the vertically when ratio of gap is 0.2/0.
Embodiment
For a better understanding of the present invention, with reference to the accompanying drawing in the embodiment of the present invention, the present invention is done and further explained
It is bright, but present disclosure is not limited solely to the following examples.Based on the embodiment in the present invention, ordinary skill
The other embodiments that personnel are obtained before without creative work under dike, belong to the scope of protection of the invention.
Embodiment 1
As shown in figs 1-9, a kind of seal clearance selfregulated glandpacking device with gas suspension effect, including multiple packings
Segmental arc, auxiliary seal bar and the spring being located between packing segmental arc.Packing segmental arc is provided with multiple gland sealing gears, totally 8 high teeth and
16 low tooth (adding up to 16 equivalent teeth), the axial width of packing segmental arc is 104mm；There are 5 high teeth and 12 low teeth in high-pressure side
(adding up to 11 equivalent teeth), high-pressure side axial width is 72.2mm；Low-pressure side has 3 high teeth and 4 low tooth (to add up to 5 equivalents
Tooth), low-pressure side axial width is 31.2mm.Gland sealing gear and rotor surface cooperatively form seal clearance, and high-pressure side gland sealing gear is set
Meter gap is 0.4 ± 0.05mm, and the design gaps of low-pressure side gland sealing gear are 0.2 ± 0.05mm, therefore, fabricate the stage, need
Ensure that (the high tooth in high-pressure side and low tooth are higher than low-pressure side respectively than the big 0.4mm of low-pressure side gland sealing gear internal diameter for high-pressure side gland sealing gear internal diameter
Tooth and the short 0.2mm of low tooth)；From the statement of another angle, when not considering tolerance, the design gaps of 16 equivalent teeth are followed successively by 0.4-
0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.2-0.2-0.2-0.2-0.2。
Above-mentioned high-pressure side and low-pressure side are obstructed by auxiliary seal bar, and auxiliary seal bar seals for c-type, is riveted on packing neck
On the inside of neck, opening is connected with high-pressure side, from swelling under differential pressure action, realizes excellent sealing.Above-mentioned c-type sealing is divided into many
Individual segmental arc, each one c-type sealing segmental arc of packing segmental arc correspondence.
It is whole to enclose packing totally 6 segmental arcs, therefore to have and be provided with arc leaf spring in the middle of 6 seams, each seam.In order to
Facilitate installation and debugging, the board-like Spring Card of arc is connected on close on the end face of packing segmental arc, and is screwed, and prevents from coming off.On
Arc leaf spring is stated to flush with the low tooth of gland sealing gear substantially close to the edge of rotor, when being made a concession due to packing segmental arc spring also with
Yielding, therefore can ensure that rotor does not touch mill with arc leaf spring.
In the high-pressure side of each packing segmental arc and the circumferentially intermediate position of low-pressure side, high pressure air channel and low pressure steaming are respectively provided with
Groove.During processing and manufacturing, it is easily achieved using milling process, the steaming groove flow area of final molding is about 50 × 2=
100mm2。
Packing high-pressure side is produced along rotor radial and close to the closing force in the direction of rotor surface, and low-pressure side is produced along rotor
The opening force in the direction of radial direction and remote rotor surface.Above-mentioned closing force and the relative size of opening force depend primarily on high-pressure side
The ratio of packing backlash and low-pressure side packing backlash, when seal clearance is larger, ratio is close to 1, and closing force is noticeably greater than
Opening force；When seal clearance is smaller, ratio is significantly increased, and during such as 0.3/0.1=3, opening force is noticeably greater than closing force.Closure
Subtract opening force equal to closing force with joint efforts, when closing with joint efforts more than zero, packing segmental arc will be somebody's turn to do in close rotor surface or generation automatically
Trend；When closure makes a concerted effort to be less than zero, packing segmental arc is by automatic remote rotor surface or produces the trend.Therefore, when packing arc
Section is on rotor radial by factors such as less frictional force, gravity (relatively a small amount of) when being influenceed, its relative position master with rotor
To depend on closing force and the relative size of opening force.When closing force and roughly equal opening force, packing segmental arc is in rotor radial
Making a concerted effort for upper all stress is zero, reaches poised state, holding position is constant.Above-mentioned poised state is only between specific sealing
It could be realized in the range of gap.In the present embodiment, in the range of the substantially 0.15~0.25mm of low-pressure side packing backlash, packing segmental arc
Poised state can be in.
When rotor is eccentric with respect to steam seal ring due to whirling motion, rotor surface is by the effect generation due to pressure difference and rotor eccentricity
Radial load in opposite direction, increase shafting damping, so as to reduce vibration, improves the stability of turbine shafting.In the present embodiment,
When rotor eddy amount is 0.05mm, the damping force more than 100kgf can be produced, effectiveness in vibration suppression is extremely notable.
The present embodiment part design condition and design result are shown in Table in 1, design result the main closure that contains and make a concerted effort (to close
Power-opening force) with high-pressure side packing backlash and the situation of low-pressure side gland sealing gear gap-ratio value changes, design result is depicted as
Fig. 9.According to design result, steam turbine before vapour is entered or enter vapour it is minimum in the case of, packing is mainly made by arc leaf spring
With and in open configuration, seal clearance is larger；With the raising of steam turbine throttle flow and steam inlet condition, pressure difference increases before and after packing
Greatly, now it is easy to the larger closure of generation to make a concerted effort, overcoming the active force of spring makes labyrinth clearance progressively reduce；Once at packing
In closure state, even if rotor is disturbed and vibrates increasing or cylinder deformation is increased, packing still adapt to above-mentioned change and from
Dynamic adjustment seal clearance, is suspended in rotor surface all the time, it is ensured that minimal clearance and never touch mill.
In steam turbine high intermediate pressure cylinder gap bridge location application the present embodiment packing, (seal clearance is general with traditional broach packing
Be designed as 0.75mm or so) design leakage rate compare, leakage rate more than 50% can be reduced；If the reality with traditional broach packing should
Compared with effect, the amplitude for reducing leakage is easier to reach more than 70%, and energy-saving potential is huge.
The part design condition of 1 embodiment of table 1 and design result.
Embodiment 2
As shown in Figure 10, it is substantially the same manner as Example 1, except that：For further improve packing back seal can
By property, auxiliary seal bar also includes opening aperture on the inside of the O-shaped sealing for being arranged on packing hangers medial surface, O-shaped sealing, once there is height
Press steam to enter, from swelling under differential pressure action, realize excellent sealing.
In the present embodiment, O-shaped sealing is divided into two semicircles, be individually positioned in above and below cylinder T-slot in, with packing hang
The medial surface crimping of ear.
In the present embodiment, c-type sealing and O-shaped sealing role are essentially identical, employ the theory of Redundancy Design, improve
The reliability of sealing.
Embodiment 3
It is substantially the same manner as Example 1, except that：High-pressure side gland sealing gear gap-ratio low-pressure side packing backlash is big, and
Some gland sealing gears in high-pressure side flow to seal clearance along steam flow and are gradually reduced, and some gland sealing gears of low-pressure side flow to seal clearance along steam flow
Keep constant；Illustrated using concrete numerical value, when not considering tolerance, the design gaps of 16 equivalent teeth are followed successively by 0.65-0.65-
0.6-0.6-0.55-0.55-0.5-0.5-0.45-0.45-0.4-0.3-0.3-0.3-0.3-0.3。
Compared with Example 1, the present embodiment optimize closure make a concerted effort (closing force-opening force) with seal clearance change it is quick
Perception, its significant advantage is reduction of the influences of the factor to packing working characteristics such as mismachining tolerance, peace tuningout difference.
Claims (7)
1. a kind of seal clearance selfregulated glandpacking device with gas suspension effect, it is characterised in that：Including multiple packing arcs
Section, auxiliary seal bar and the spring being located between packing segmental arc；Packing segmental arc is provided with gland sealing gear, and described gland sealing gear includes height
Press side gland sealing gear and low-pressure side gland sealing gear；Auxiliary seal bar upstream is defined as high-pressure side, and auxiliary seal bar downstream is defined as low pressure
Side；The high-pressure side axial width is more than low-pressure side axial width, and the high-pressure side gland sealing gear number is more than low-pressure side gland sealing gear
Number, and high-pressure side packing backlash is all higher than low-pressure side packing backlash, both differ 0.1~0.8mm, total yield tooth number
No less than 10, the low tooth that a high tooth is designated as between an equivalent tooth, two high teeth is also denoted as an equivalent tooth, and no matter two
How many is all designated as an equivalent tooth for low tooth between individual high tooth；Gland sealing gear cooperatively forms seal clearance with rotor surface, and
Some gland sealing gears in high-pressure side flow to seal clearance along steam flow and are gradually reduced, and some gland sealing gears of low-pressure side flow to seal clearance along steam flow
Keep constant；Packing segmental arc centre position sets high pressure steaming groove and low pressure steaming groove respectively, and packing segmental arc back cavity connects respectively
Logical high-pressure side and low-pressure side, high steam and low-pressure steam are obstructed by auxiliary seal bar；The auxiliary seal bar at least includes
The c-type sealing of packing neck medial surface is arranged on, c-type sealing opening is connected with high-pressure side.
2. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 1, its feature exists
In：Described spring is spiral compression spring or arc leaf spring.
3. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 2, its feature exists
In：Described arc leaf spring is flushed close to the edge of rotor with the low tooth of gland sealing gear, but not higher than low tooth.
4. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 1, its feature exists
In：The c-type sealing is divided into multiple segmental arcs, each one c-type sealing segmental arc of packing segmental arc correspondence, and c-type sealing mounting groove
Inner side sets riveting groove.
5. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 1, its feature exists
In：The auxiliary seal bar also includes opening aperture on the inside of the O-shaped sealing for being arranged on packing hangers medial surface, O-shaped sealing.
6. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 5, its feature exists
In：It is described it is O-shaped sealing be divided into two semicircles, be individually positioned in above and below cylinder T-slot in, the inner side face pressure with packing hangers
Connect.
7. a kind of seal clearance selfregulated glandpacking device with gas suspension effect as claimed in claim 1, its feature exists
In：The packing segmental arc is radially included hangers, neck, packing matrix and the gland sealing gear connected successively by outer ring to inner ring；Hang
Ear coordinates with the wider part of stator T-slot, and neck coordinates with the narrower part of stator T-slot；Packing segmental arc back cavity refers to
Hangers cooperatively forms packing segmental arc back cavity with stator T-slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610029922.4A CN105673091B (en) | 2016-01-18 | 2016-01-18 | A kind of seal clearance selfregulated glandpacking device with gas suspension effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610029922.4A CN105673091B (en) | 2016-01-18 | 2016-01-18 | A kind of seal clearance selfregulated glandpacking device with gas suspension effect |
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| CN105673091A CN105673091A (en) | 2016-06-15 |
| CN105673091B true CN105673091B (en) | 2017-07-11 |
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| CN106090236B (en) * | 2016-08-26 | 2018-01-30 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of rotating machinery non-contacting seal adjustable apparatus |
| EP3333372A1 (en) * | 2016-12-09 | 2018-06-13 | General Electric Technology GmbH | Turbine, corresponding steam turbine and operating method |
| CN114486222A (en) * | 2022-01-26 | 2022-05-13 | 沈阳航空航天大学 | Composite experimental device for movable blade heat engine of air seal type gas turbine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810365A (en) * | 1996-08-05 | 1998-09-22 | Brandon; Ronald Earl | Retractable segmented packing rings for fluid turbines |
| CN102200140A (en) * | 2011-06-30 | 2011-09-28 | 兖矿鲁南化肥厂 | Centrifugal compressor provided with damping seal |
| CN204420158U (en) * | 2014-12-05 | 2015-06-24 | 广州广重企业集团有限公司 | A kind of gate sealing configuration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1397706B1 (en) * | 2009-12-22 | 2013-01-24 | Nuovo Pignone Spa | SEAL THAT CAN BE ABRADED WITH AXIAL SHIFT. |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810365A (en) * | 1996-08-05 | 1998-09-22 | Brandon; Ronald Earl | Retractable segmented packing rings for fluid turbines |
| CN102200140A (en) * | 2011-06-30 | 2011-09-28 | 兖矿鲁南化肥厂 | Centrifugal compressor provided with damping seal |
| CN204420158U (en) * | 2014-12-05 | 2015-06-24 | 广州广重企业集团有限公司 | A kind of gate sealing configuration |
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| CN105673091A (en) | 2016-06-15 |
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