CN106837435B - The method and device of jet sectional center frame vibration damping adjusting steam turbine sealing gland - Google Patents

Abstract

Jet sectional center frame vibration damping adjusts the method and device of steam turbine sealing gland, and the present invention relates to a kind of method and devices in sealing gland gap at the top of adjusting Steam Turbines.When solving air loss at reduction Steam Turbines top sealing gland now, only with passive the problem of coping with rotor radial bounce, other unfavorable factors can be brought.The scheme of method and apparatus is: after steam turbine reaches rated speed, making top bearing shell and lower bearing gradually around turbine spindle, to reduce the circular runout of turbine spindle；Then make three idler wheels gradually close to turbine spindle；After idler wheel contacts turbine spindle, contacted at line of the two to rolling；Top bearing shell and lower bearing are retracted gradually far from turbine spindle；It collapses the bore area of air seal component at the top of movable vane gradually to turbine blade outer diameter, ultimately forms gap between the two between 0.15 to 0.25 millimeter；It first uses jet bearing shell to constrain turbine spindle, adjustment process is more steady.

Description

The method and device of jet sectional center frame vibration damping adjusting steam turbine sealing gland

Technical field

The present invention relates to a kind of method and devices in sealing gland gap at the top of adjusting Steam Turbines.

Background technique

Steam turbine is a kind of dynamic power machine by the thermal energy of steam for mechanical energy, and grade is its most basic job note Member, the moving blades of each grade by nozzle and thereafter are formed in structure, its thermal energy is kinetic energy after steam enters nozzle, so Enter movable vane afterwards, to movable vane piece with impact force, impeller is made to rotate and export mechanical work.

Large-size steam turbine is exactly to be made of multiple grades, and each grade is made of dynamic and static two parts, therefore entire steam turbine Just it is made of dynamic and static two parts.There must be certain gap between the rotation and stationary part of steam turbine, to prevent phase mutual friction. Since inside and outside cylinder, there are pressure differences for before and after partition and movable vane two sides, and one must be kept between corresponding sound part everywhere Fixed gap is so that they will not collide, it is therefore necessary to sealing gland be arranged.

The packing of steam turbine is divided into according to the position difference of installation: shaft end gland seal (abbreviation axle envelope), diaphragm gland and through-flow Part packing is respectively intended to prevent the leakage of the shaft end of steam turbine, partition and movable vane overhead vapor, and effect is outside preventing respectively Boundary's air enters steam turbine, mixes with the steam in steam turbine, reduces steam leakage, to reduce rate of water make-up and prevent a high position The working media of energy can be flowed to low level.As the vulnerable part and essential element of steam turbine, the packing of steam turbine increasingly causes It is engaged in the concern of the engineers and technicians of Design of Steam Turbine.

From the test result of steam turbine operation can be seen that stage between steam leak so that unit internal efficiency reduce, Leakage losses accounts for the 29% of grade total losses, wherein at the top of movable vane leakage losses then the total leakage losses of Zhan 80%, than stator blade or dynamic The profile loss or secondary flow loss of leaf are also big, and the latter only accounts for and loses 15% in grade.In recent years not with seal system for steam turbine Disconnected development, the security reliability and generatine set heat efficiency of steam turbine operation are all correspondingly improved.In order to reduce air loss, mention High unit safety and economy, domestic and international relevant department are transformed and design to traditional packing, have occurred successively many new Type packing.Current existing packing mainly include the following types:

(1) tooth-like (labyrinth type) packing is dredged

The traditional packing for being widely used in large, medium and small type steam turbine at present is mainly labyrinth gland.Labyrinth gland In, serrate-type steam seal is because its packing is at low cost, structure is simple, safe and reliable and be easily installed due to is widely used.Its structure is such as Fig. 3.

Since the packing product is a kind of contactless rigid seal, gap is too small, and gland sealing gear is just easy to touch with rotor Mill, but also safety problem can be brought because two rigidity touch mill.The problem of use, has:

(1) machine is excessively critical, abnormal vibrations are overproof, due to flow-induced vibration etc. opening, and all gland sealing gear can be made to cause permanently Abrasion, lead to the increase of seal clearance at double, that is to say, that have very much can for the labyrinth clearance adjusted meticulously when maintenance and installation Can be just big by mill when starting critical for the first time, for old unit, such case is more obvious.Therefore rotor is considered The vibration of critical speed is crossed, radial clearance is generally 0.60~0.80mm when traditional comb-tooth-type labyrinth gland is installed, according to rotor Different situations, some gaps are bigger.The leakage flow of labyrinth seal steeply rises with the increase of pressure difference, and leakage efficiency is anxious Play decline shows, the every increase 0.0254mm of steam turbine clearance adjustment, mean power loses about 4~5kW according to related statistics.

(2) when gland sealing gear and axis touch mill, moment generates amount of heat, causes axis hot-spot, in some instances it may even be possible to cause Permanent bending of rotor is ensured so power plant can only tune up packing radial clearance in unit maintenance using sacrificing economy as cost The safety of unit.

(3) in actual operation since the spring leaf of gland blocks is chronically in the steam of high temperature and pressure, working environment is disliked It is bad, add spring leaf material itself the reason of, in overhaul of steam turbine it is often found that because spring leaf elasticity is bad, gland blocks because Fouling, which is stuck, causes labyrinth clearance to change.

(4) inhomogeneities of labyrinth seal annular compartment is to generate the major reason of steam flow excitation, and turbine high-pressure turns The steam flow excitation that son generates jeopardizes the safe operation of unit once being difficult to solve.

(2) Honeycomb steam seal

When the Throttle Principle of honeycomb seal is that air-flow flows through honeycomb, vortex is formed under certain flow velocity and gap, and is produced Raw damping.But under actual motion condition, be not able to satisfy vortex type at condition, it is existing to be hardly formed good vortex As.Its structure is still a kind of rigid seal, once touching mill will result in permanent abrasion, and gap increases with it.Gap When too small, the machine of opening is easy to seize, and has caused machine difficult, the excessive then poor sealing effect in gap, therefore honeycomb is commonly used in low pressure end Grade leaf top wet-steam region.

Honeycomb steam seal makes a concession the back plate spring structure that structure still uses traditional packing, so installation gap generally takes tradition The upper limit of packing radial clearance design value.Easy to wear, gap can not restore, if gap is too small or expansion unevenness will cause cellular band With rotor (or shroud) face contact, the case where vibration aggravates even rotor locking may cause.

(3) selfregulated glandpacking (brandon steam-glanding)

The working principle of brandon steam-glanding is to change by the pressure difference of front and backs at different levels to overcome spring force, plays adjusting gas Seal the effect in gap.Vibration when which solves units existing for traditional sealing gland to open, rotor present in stopping process is excessively critical It is excessive and the problem of cause sealing gland to touch and rub, also solved critical vibration and asked what sealing gland gap caused permanently to increase greatly Topic, adapts to the variation adjust automatically seal clearance of unit load.The general sealing gland is used for high-pressure section partition, because here The front and back pressure difference of stage can satisfy needs, and mesolow part and axle envelope are then not suitable for, and diameter is excessive at leaf top, such as Fruit uses Bu Laideng sealing gland, and the gaping of joints at every adjacent two pieces of sealing glands is reserved will be very big, therefore leakage formed here Amount may not necessarily compensate income obtained after the adjustment of sealing gland gap.

In addition, sealing gland ring under the action of the spring, is in fully open position, at this time between sealing gland in starting and initial load stage Gap is maximum, and air leakage is big, and rotor heating is fast, if biggish just swollen difference, easily occurs in cylinder heating lag.

In addition, such sealing is higher to water quality requirement.Longtime running may cause spring fouling, fatigue failure and can not grow Phase keeps sensitive self-adjusting effect, and unit, which is again started up, rubbing occurs because gap is smaller, it is possible to create vibration.

(4) contact packing

" contact sealing gland " be among traditional comb-tooth-type sealing gland block insertion one circle can with the diaphragm seal that axis directly contacts, and And can be made a concession automatically under the effect of spring leaf elastic force, to guarantee to contact with axis always, belong to flexible sealing, it adapts to rotor Bounce.But it is contacted for a long time with axial plane, frictional heat generation, intensity and physical characteristic to material etc. have higher requirements, and the heat generated If amount cannot drain in time, it may cause the serious problems such as overheating deforming.

(5) side tooth seal

It is to be transformed on a high tooth of comb teeth packing, adds the road 1-2 edge again on the direction perpendicular to gland sealing gear Axially extending tooth form.Its principle is to will form vortex when air-flow encounters this stairstepping tooth, plays damping action.But Such packing is limited to axial gap, still can not solve the problems, such as that abrasion post gap permanently increases, the effect of side tooth damping As the increase in gap and have a greatly reduced quality.

(6) DAS packing

Also it is " canine tooth packing ".Its structure is similar with comb teeth, but the tooth of gland blocks two sides increases thickening, and uses ferrite Wear-resistant material.If it happens touched and rubbed when being switched on critical, just only with canine tooth grazing, other teeth are protected, but the packing with Axis will cause unit vibration when rubbing.

(7) adjustable steam seal

When steam turbine crosses critical speed, vibration can be increased, if gap is too small, be will result in sound friction, influenced safety. Adjustable sealing is so that packing segmental arc is maintained larger gap using spring force during startup.After passing through critical speed, By steam pressure compressed spring, reduce packing segmental arc gap.

Adjustable steam seal vibrates the influence for increasing and wearing to packing during addressing only start and stop, but in unit operation It vibrates and increases as caused by other factors, adjustable steam seal not can avoid friction.In addition, spring becomes rusty for a long time in a high temperauture environment Erosion easilys lead to elastic failure, and effect is undesirable in practical applications.

(8) brush steam seal

Brush seal is applied in aero-engine earliest, and Hou You GE company is used on industrial combustion gas formula steam turbine.It should In sealing, dielectric leakage is occurred mainly in the micro gap formed between the fine wire of dense arrangement, these gap institute shapes At zigzag path ensure that fluid in the inhomogeneities wherein flowed, makes fluid be produced from sealing effect, to reduce leakage. The bristle of highdensity high temperature cobalt-base alloys fine wire composition, can be indeformable with resistance to 1200 degrees Celsius or more of high temperature.Operation When brush wire bundle be similar to shelter-forest wind effects, play sealing effect.The packing belongs to flexible sealing, is adapted to rotor wink State beats and keeps gap constant.Influence to unit safety is smaller.The disadvantage is that: brush filament is expensive, and processing technology is wanted Ask higher, higher cost.

In summary: (1) the traditional possibility dredging tooth-like packing and Honeycomb steam seal further again do not reduce labyrinth clearance, It can not carry out reducing the design of air loss again.(2) although selfregulated glandpacking and adjustable steam seal can pass through automatic or manual Mode changes the gap between stator and rotor, but be merely capable of reply critical speed when circular runout increase suddenly；No The bounce of rotor radial caused by other reasons can be coped with to increase suddenly.In addition spring part has been used in two kinds of packings, and vapour High temperature, high humidity environment inside turbine unavoidably reduce the service life of two kinds of packings.(3) contact packing, DAS Although packing, brush steam seal have reduced or even eliminated the gap between stator and rotor, but increase friction, reduce steam turbine Safety；Although taking the measure of influence when reducing stator and friction rotor, produced in friction part material therewith Particular/special requirement, or even improve steam turbine cost.

In order to reduce air loss, although above-mentioned packing component is in design all in view of the circular runout of rotor is to reduction Labyrinth clearance adverse effect, but when coping with these adverse effects, do not had by the way of passively coping with While considering to reduce the active mode that rotor radial is beated, therefore obtain certain effect, other unfavorable factors can be brought.

Summary of the invention

The purpose of the present invention is to solve the prior arts when reducing air loss at sealing gland at the top of Steam Turbines, only Only with passive reply rotor radial bounce, while obtaining certain effect, the problem of other unfavorable factors can be brought.

The present invention is realized by following step:

One, steam turbine starts；Before starting, the bore area and turbine blade of air seal component at the top of the movable vane of steam turbine Gap between outer diameter is between 1.5 to 2.5 millimeters；

Two, after steam turbine reaches rated speed, the aiding support component being arranged at partition inner hole is adjusted, aiding support is made Top bearing shell and lower bearing on component gradually tend to close up and surround turbine spindle, are jumped with reducing the radial of turbine spindle It is dynamic；

The aiding support component includes top bearing shell, lower bearing and radial propulsion device, the inner circle of top bearing shell and lower bearing Arc surface is provided with uniformly distributed micro- stomata, and the inlet end of micro- stomata, which is respectively communicated on the external arc surface of top bearing shell and lower bearing, to be arranged Plenum chamber, micro- stomata and plenum chamber form air-channel system, and plenum chamber is communicated with micro- stomata makes top bearing shell and lower bearing Inner surface form air cushion, the outer surface of plenum chamber and the front end surface of radial direction propulsion device are fixed, and radial propulsion device is set It sets in the mounting hole opened on the bore area of partition；

Three, the righting device assembly being arranged on partition inner hole is adjusted, makes three idler wheels in righting device assembly gradually to vapour Turbine main shaft is close；

The righting device assembly includes three idler wheels, three push rods, three propulsion devices, and three push rods are perpendicular to steamer Divide equally in the plane of owner's axis in 120 degree and arranges；A propulsion is arranged in push rod front end, the rear end of each push rod in idler wheel setting Device after idler wheel contacts turbine spindle, is contacted at line of the two to rolling；

Four, top bearing shell and lower bearing on aiding support component are retracted gradually with separate turbine spindle, and makes gas circuit System stops gas supply；

Five, air seal component at the top of Steam Turbines is adjusted, makes the bore area of air seal component at the top of movable vane to steam turbine leaf Piece outer diameter gradually collapses, and ultimately forms gap between the two between 0.15 to 0.25 millimeter；Sealing gland group at the top of the movable vane Part includes leadscrew-nut mechanism, air sealing and motor, and air seal component is embedded on the inner wall of steam turbine gas chamber shell at the top of movable vane, Motor drives air sealing to move along the radial direction of turbine spindle by leadscrew-nut mechanism.

The solution have the advantages that: by the circular runout of turbine spindle of centralizer component constraint, to make to adjust Gap becomes easy at sealing gland at the top of section Steam Turbines, thus can finally make at the top of movable vane the bore area of air seal component with When it is lower limit value, compare labyrinth sealing between 0.15 to 0.45 millimeter in blade outer surface gap between the two Gap value it is 3 times small, it is also smaller than contact seal gap.When the dynamic balancing of turbine spindle deteriorates, adjusting can gradually become In upper limit value.But since this constraint always exists, while obtaining the effect that steam leakage amount reduces, moreover it is possible in steam When pressure oscillation, reduces steam turbine shaft run-out, maintain the stabilization of steam turbine operation.Furthermore it is also possible at any time according to vapour Turbine operating status, dynamic regulation righting device assembly is between at sealing gland at the top of the degree of restraint and Steam Turbines of turbine spindle Gap.

Turbine spindle is given about in advance due to before righting device assembly application effect, first using jet bearing shell Beam reduces the contact vibration of righting device assembly and turbine spindle, keeps adjustment process more steady, and righting device assembly is to vapour The constraint precision of turbine main shaft is higher, more stable.

Detailed description of the invention

Fig. 1 is the schematic diagram in the impulsive style steam turbine sealing gland gap of the prior art；Wherein appended drawing reference 1-1 be partition (or Fixed blade ring) sealing gland radial clearance, 1-2 is sealing gland radial clearance at the top of movable vane, and 1-3 is at sealing gland axial gap or movable vane root Axial sealing gland gap；Fig. 2 is the packing use state diagram of the prior art；Appended drawing reference 2-1 is partition body in figure, and 2-2 is Rotor blade, 2-3 are sealing gland rings, and sealing gland ring is in the packing slot of partition inner circle；Fig. 3 is interdigitated electrode structure labyrinth seal schematic diagram； Fig. 4 is the structural schematic diagram of side tooth sealing gland；Appended drawing reference 4-1 is spring in figure, and appended drawing reference 4-2 is sealing gland circle；Fig. 5 is brush The schematic illustration of packing；Appended drawing reference 5-1 is the pivot angle of bristle in figure, and 5-2 is rotor；Arrow in figure is the movement of rotor Direction；Fig. 6 is air seal component structural schematic diagram at the top of movable vane of the invention；Fig. 7 is the A of Fig. 6 to schematic diagram；Fig. 8 is centralizer The attachment structure schematic diagram of component and partition；Fig. 9 is the structural schematic diagram of aiding support component；Figure 10 is pushed away in righting device assembly Into the attachment structure schematic diagram of device.

Specific embodiment

Specific embodiment 1: illustrating present embodiment below with reference to Fig. 6 to Figure 10.Present embodiment passes through as follows Step is realized:

One, steam turbine starts；Before starting, the bore area and turbine blade of air seal component at the top of the movable vane of steam turbine Clearance t between outer surface is between 1.5 to 10 millimeters；

Two, after steam turbine reaches rated speed, the aiding support component being arranged at partition inner hole is adjusted, aiding support is made Top bearing shell and lower bearing on component gradually tend to close up and surround turbine spindle, are jumped with reducing the radial of turbine spindle It is dynamic；When original state, the inner surface and turbine spindle 9-3 of top bearing shell 7-1 and lower bearing 7-2 on aiding support component The distance on surface can be 5 to 10 millimeters.

The aiding support component includes top bearing shell 7-1, lower bearing 7-2 and radial direction propulsion device I, top bearing shell 7-1 under The Inner arc surface of bearing shell 7-2 is provided with uniformly distributed micro- stomata 7-4, and the inlet end of micro- stomata 7-4 is respectively communicated with top bearing shell 7-1 under Plenum chamber 7-5, micro- stomata 7-4 and plenum chamber 7-5 the composition air-channel system being arranged on the external arc surface of bearing shell 7-2 are high Plenum chamber 7-5 is communicated with micro- stomata 7-4 makes the inner surface of top bearing shell 7-1 and lower bearing 7-2 form air cushion, plenum chamber 7-5's Outer surface and the front end surface of radial propulsion device I are fixed, and radial propulsion device I, which is arranged on the bore area of partition 9-6, to be opened Mounting hole in；

Air pressure in the plenum chamber 7-5 can be established by drawing a pneumatic circuit from steam turbine air distribution system And holding.A pneumatic circuit can also be individually introduced outside steam turbine.Air pressure in plenum chamber 7-5 is about 15 to 20MPa.

Three, the righting device assembly being arranged on partition inner hole is adjusted, makes three idler wheels in righting device assembly gradually to vapour Turbine main shaft is close；When original state, the surface idler wheel 8-1 in righting device assembly and the surface turbine spindle 9-3 away from From can be 5 to 10 millimeters.

The righting device assembly includes three idler wheel 8-1, three push rod 8-2, three propulsion devices 8-3, three push rod 8-2 Divide equally in the plane perpendicular to turbine spindle in 120 degree and arranges；Idler wheel 8-1 is arranged in the front end push rod 8-2, each push rod 8- A propulsion device 8-3 is all arranged in 2 rear end, after idler wheel 8-1 contacts turbine spindle 9-3, contacts at line of the two to rolling；

Four, top bearing shell 7-1 and lower bearing 7-2 on aiding support component are retracted gradually to leave turbine spindle 9-3 Outer surface, and make air-channel system stop gas supply；

Five, air seal component at the top of Steam Turbines is adjusted, makes the bore area of air seal component at the top of movable vane to steam turbine leaf Piece outer surface is gradually collapsed, and ultimately forms gap between the two between 0.15 to 0.45 millimeter；Sealing gland at the top of the movable vane Component includes leadscrew-nut mechanism, air sealing, retarder and motor, and air seal component is embedded in steam turbine gas chamber shell at the top of movable vane Inner wall in, motor drives air sealing to move along the radial direction of turbine spindle by retarder and leadscrew-nut mechanism.

The selection of Motor stepper motor controls stepper motor by stepper motor impulse generator and host computer Movement, motor, retarder and leadscrew-nut mechanism form transmission chain, so that the bore area of air sealing is to turbine blade 6-12 The average speed that outer surface is gradually collapsed controls below 0.06 mm/second.In order to obtain bigger gear ratio, retarder can To select planetary reducer.It, both can be in host computer during driving roller motion by propulsion device 8-3 In program, allow three propulsion device 8-3 to drive three roller motions automatically, can also be driven either manually or by host computer It is dynamic.Three idler wheels both can also be different step movement with synchronization action.

Air seal component is by the identical two semitight circle 6-11 of structure and at least four groups of transmission mechanism groups at the top of the movable vane At one group of transmission mechanism is respectively arranged in the both ends for curving the semitight circle 6-11 of semi-annular shape；Every group of transmission mechanism includes driven tooth Wheel 6-2, driving gear 6-3, the first positioning bearing 6-4, driving gear shaft 6-5, second position bearing 6-6, driving motor and subtract Fast device 6-7, third positioning bearing 6-8, driving screw rod 6-9 and swivel nut 6-10, semitight circle 6-11 are inlaid in steam turbine gas chamber shell In the groove 6-13 of body 6-1 medial surface, driving motor and retarder 6-7 are inlaid in steam turbine gas chamber shell 6-1, swivel nut 6-10 One end connect with the lateral surface of semitight circle 6-11, connection can using flexural pivot by the way of and consideration four driving screw rod 6- 9 are parallel to each other, driving screw rod 6-9 one end screw in the other end of swivel nut 6-10, drive screw rod 6-9 the other end with it is driven Gear 6-2 is coaxially fixed, and driven gear 6-2 is engaged with driving gear 6-3, one end of driving gear 6-3 and driving gear shaft 6-5 Connection, the other end and driving motor of driving gear shaft 6-5 and the rotation axis connection of retarder 6-7, driving gear shaft 6-5 pass through First positioning bearing 6-4 and the second positioning bearing 6-6 are mounted in steam turbine gas chamber shell 6-1, and driving screw rod 6-9 passes through third Positioning bearing 6-8 is mounted in steam turbine gas chamber shell 6-1.Two semitight circle 6-11 form whole circle after being interlocked.

Present embodiment is used for impulsive style steam turbine, and diameter of the turbine spindle at setting righting device assembly is 620 Millimeter.Turbine spindle both ends are arranged diameter at the diameter of axle of bearing and are typically chosen turbine spindle about at 300 to 400 millimeters Intermediate position be arranged righting device assembly.Present embodiment is provided with centralizer group in the about middle position of turbine spindle Part improves the stress condition of shafting structure equivalent to increase an intermediate supports significantly.

Specific embodiment 2: illustrating present embodiment below with reference to Fig. 6 and Fig. 8.Present embodiment and embodiment party Formula one is compared: this method further includes three groups of range sensor 6-14 and one group of vibrating sensor 8-5, first group of Distance-sensing Gap and vapour on air sealing 6-11 with real-time measurement air sealing 6-11 and the outer surface turbine blade 6-12 is arranged in device 6-14 The circular runout of the outer surface turbine blade 6-12；Second group of range sensor 8-4 is separately positioned on the front end of push rod 8-2 Place, with real-time measurement idler wheel 8-1 at a distance from turbine spindle 9-3 and the circular runout of turbine spindle 9-3；The third group Range sensor is arranged on top bearing shell 7-1 and lower bearing 7-2, with real-time measurement top bearing shell 7-1 and lower bearing 7-2 and steam turbine The gap of main shaft 9-3 and the circular runout of turbine spindle 9-3；One group of vibrating sensor 8-5 is arranged at the front end of push rod 8-2 To acquire vibration data.

Further include following technological means in second step, makes top bearing shell 7-1 and lower bearing 7-2 on aiding support component Gradually tend to during closing up and surrounding turbine spindle 9-3, acquires top bearing shell 7-1 and lower bearing 7-2 and steam turbine in real time The variation of pressure and the circular runout of turbine spindle 9-3 in the gap of main shaft 9-3, plenum chamber 7-5, if gap subtracts Small, pressure in plenum chamber 7-5 rising is synchronous with the reduction of bounce to continue, then continues to make the top bearing shell on aiding support component 7-1 and lower bearing 7-2 gradually tend to the movement closed up；When detecting pressure in the reduction for gap occur and plenum chamber 7-5 Rise with the reduction of bounce cannot synchronous continuity the case where when, stopping makes top bearing shell 7-1 and lower bearing on aiding support component The movement that 7-2 closes up.The gap T of top bearing shell and lower bearing and turbine spindle commonly reaches 0.10 to 0.30 milli after adjusting Rice, the circular runout of turbine spindle is between 0.08 to 0.12 millimeter.The indoor pressure of high pressure gas be typically chosen 15 to 20MPa.In the early stage, farther out from turbine spindle due to bearing shell, in the reduction plenum chamber 7-5 in gap pressure not on It rises, the circular runout of turbine spindle will not synchronize reduction, this period keeps top bearing shell 7-1 and lower bearing 7-2 to steamer The movement of owner's axis 9-3 movement, until pressure rises in plenum chamber 7-5.In order to make the air cushion established in plenum chamber Rigidity is more preferable, top bearing shell and the corresponding position of lower bearing and turbine spindle can be designed to be conducive to air cushion holding Shape, such as annular rib band is set to reduce the gas leakage of bearing shell end on axis, gas is deposited in setting at micro- stomata of inner surface of bearing bush Recessed channel etc..

It further include following technological means in third step, it is real during idler wheel 8-1 levels off to turbine spindle 9-3 When acquire idler wheel 8-1 at a distance from turbine spindle 9-3, control each idler wheel 8-1 approximation phase at a distance from turbine spindle 9-3 Together；After some idler wheel 8-1 in righting device assembly has contacted turbine spindle 9-3, acquire turbine spindle 9-3's in real time Circular runout, if the circular runout of turbine spindle 9-3 no longer reduces, then idler wheel with the lasting feeding of three idler wheel 8-1 The feeding of 8-1 stops.So after operation, the circular runout of turbine spindle can generally reach between 0.03 to 0.05 millimeter.

Other technological means are same as the specific embodiment one.

Specific embodiment 3: illustrating present embodiment below with reference to Fig. 6.The 5th step of present embodiment further includes Following technological means, in the process for collapsing the bore area of air seal component at the top of movable vane to the outer surface turbine blade 6-12 In, air sealing 6-11 and the gap of the outer surface turbine blade 6-12 and the radial direction of the outer surface turbine blade 6-12 are acquired in real time The vibration data of bounce and vibrating sensor 8-5 acquisition, to guarantee that the numerical value of clearance t is consistently greater than the numerical value of circular runout, such as There is vibration data and increases extremely in fruit, then counteragent increases the bore area of air seal component and steam turbine leaf at the top of movable vane immediately The distance of piece outer surface, when before vibration data being restored to abnormal increase, then recovery operation.The vibration data increases extremely Refer to that air seal component is in 1 times or so of the amplitude amplification of 0.5 second internal vibration wave at the top of movable vane.

Other technological means are identical with embodiment two.So set, avoiding in steam turbine because steam pressure becomes Fluctuation of service caused by dynamic makes the bore area of air seal component at the top of movable vane that grazing occur to turbine blade outer surface suddenly. It is made a concession immediately after vibrating sensor 8-5 collects signal in case of small grazing, after stablizing, then carries out gap tune Section.

Specific embodiment 4: illustrating present embodiment below with reference to Figure 10.The propulsion of the righting device assembly fills Setting 8-3 includes rack gear 10-1, gear 10-2 and motor and retarder 10-3, is provided with cavity 10-6 in steam turbine internal partition 10-4, Rack gear 10-1, gear 10-2 and motor and retarder 10-3 are arranged in cavity 10-6, and rack gear 10-1 is along perpendicular to steam turbine The direction main shaft 9-3 arrangement, one end of rack gear 10-1 is pierced by cavity 10-6 and fixes with push rod 8-2 phase, the cross of the rack gear 10-1 Section is rectangle, and cavity 10-6 forms the guide slide 10-7, rack gear 10- that cross section is rectangle in the position that rack gear 10-1 is pierced by Setting guide sleeve 10-8, guide slide 10-7 and guide sleeve 10-8 ensure that rack gear 10-1's in the cavity 10-6 of 1 other end Movement and positioning accuracy, gear 10-2 are meshed with rack gear 10-1, and the gear shaft of gear 10-2 is connected to motor and retarder 10- On 3 output shaft, the idler wheel 8-1 is adjacent with partition air sealing 10-5.The selection of Motor of the motor and retarder 10-3 step Into motor, the movement of stepper motor, motor, retarder and tooth are controlled by stepper motor impulse generator and host computer Wheel, rack gear form transmission chain, so that the average speed that idler wheel 8-1 is gradually collapsed to the outer surface turbine spindle 9-3 Control is below 0.06 mm/second.In order to obtain bigger gear ratio, retarder can choose planetary reducer.Every Plate air sealing 10-5 is played the role of, partition sealing gland 1-1 as shown in figure 1 identical as the partition sealing gland of the prior art, The purpose for retaining partition air sealing 10-5 is to prevent gas leakage herein.

Other technological means are same as the specific embodiment one.

Specific embodiment 5: the difference of present embodiment and embodiment two is that range sensor is preferentially selected as Eddy current displacement sensor, vibrating sensor are preferentially selected as moving-coil type vibrating speed sensors.Current vortex sensor can be static Metal conductor measured is measured to dynamically non-contact, high linearity, high-resolution away from detecting head surface distance.In quick peeler In tool and the analysis of reciprocating machine performance, vibration research and analysis measurement, the vibration of non-contacting high-precision, displacement are believed Number, it continuously can accurately collect many kinds of parameters of rotor oscillation state.Such as the radial vibration of axis, amplitude and axial position. Moving-coil type vibrating speed sensors are structurally characterized in that: steel circular housing, the inside aluminum frame by cylindrical permanent magnet with Shell is integrally fixed, and has an aperture among permanent magnet, and coil and damping ring, mandrel are erected in the mandrel both ends across aperture Both ends are aerial by circular film support and are connected with shell.When work, sensor and testee are rigidly connected, when object shakes When dynamic, sensor outer housing and permanent magnet vibrate therewith, and overhead mandrel, coil and damping ring are because inertia without shaking therewith It is dynamic.Thus, the coil cutting magnetic line in magnetic circuit gap and generate the induced electromotive force for being proportional to vibration velocity, the output of coil Measuring circuit is output to by lead.It, can be with design protection shell and guarantor due to the environment of steam turbine internal high temperature and high humility Sheath protects sensor and conducting wire.

Other technological means are identical with embodiment two.

Claims (10)

1. the method for jet sectional center frame vibration damping adjusting steam turbine sealing gland, it is characterised in that real by this method following step It is existing:

One, steam turbine starts；Before starting, the bore area and turbine blade outer diameter of air seal component at the top of the movable vane of steam turbine Between gap between 1.5 to 2.5 millimeters；

Two, after steam turbine reaches rated speed, the aiding support component being arranged at partition inner hole is adjusted, aiding support component is made On top bearing shell and lower bearing gradually tend to close up and around turbine spindle, to reduce the circular runout of turbine spindle；

The aiding support component includes top bearing shell, lower bearing and radial propulsion device, the Inner arc table of top bearing shell and lower bearing Face is provided with uniformly distributed micro- stomata, and the inlet end of micro- stomata is respectively communicated with the height being arranged on the external arc surface of top bearing shell and lower bearing Plenum chamber, micro- stomata and plenum chamber form air-channel system, and plenum chamber is communicated with micro- stomata makes the interior of top bearing shell and lower bearing Surface forms air cushion, and the outer surface of plenum chamber and the front end surface of radial propulsion device are fixed, and radial propulsion device setting exists In the mounting hole opened on the bore area of partition；

Three, the righting device assembly being arranged on partition inner hole is adjusted, makes three idler wheels in righting device assembly gradually to steam turbine Main shaft is close；

The righting device assembly includes three idler wheels, three push rods, three propulsion devices, and three push rods are perpendicular to steamer owner Divide equally in the plane of axis in 120 degree and arranges；In push rod front end, the rear end of each push rod is arranged a propulsion and fills for idler wheel setting It sets, after idler wheel contacts turbine spindle, is contacted at line of the two to rolling；

Four, top bearing shell and lower bearing on aiding support component are retracted gradually with separate turbine spindle, and makes air-channel system Stop gas supply；

Five, air seal component at the top of Steam Turbines is adjusted, makes the bore area of air seal component at the top of movable vane to outside turbine blade Diameter gradually collapses, and ultimately forms gap between the two between 0.15 to 0.25 millimeter；Air seal component packet at the top of the movable vane Leadscrew-nut mechanism, air sealing and motor are included, air seal component is embedded on the inner wall of steam turbine gas chamber shell at the top of movable vane, motor Air sealing is driven to move along the radial direction of turbine spindle by leadscrew-nut mechanism.

2. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 1, it is characterised in that: the party Method also further includes three groups of range sensors (6-14) and one group of vibrating sensor (8-5), range sensor (6- described in first group 14) be arranged on air sealing (6-11) with the gap of real-time measurement air sealing (6-11) and the outer surface turbine blade (6-12) and The circular runout of the outer surface turbine blade (6-12)；Range sensor described in second group (6-14) is separately positioned on push rod (8- 2) at front end, with real-time measurement idler wheel (8-1) at a distance from turbine spindle (9-3) and the radial direction of turbine spindle (9-3) Bounce；Range sensor described in third group (6-14) is arranged on top bearing shell (7-1) and lower bearing (7-2), in real-time measurement Bearing shell (7-1) and lower bearing (7-2) and the gap of turbine spindle (9-3) and the circular runout of turbine spindle (9-3)；One group Vibrating sensor (8-5) is arranged at the front end of push rod (8-2) to acquire vibration data.

3. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: second Further include following technological means in step, tends to top bearing shell (7-1) on aiding support component and lower bearing (7-2) gradually During closing up and surrounding turbine spindle (9-3), top bearing shell (7-1) and lower bearing (7-2) and steamer owner are acquired in real time Gap, the variation of plenum chamber (7-5) interior pressure and the circular runout of turbine spindle (9-3) of axis (9-3), if gap Reduce, the rising of plenum chamber (7-5) interior pressure continuity synchronous with the reduction of bounce, then continues to make upper on aiding support component Bearing shell (7-1) and lower bearing (7-2) gradually tend to the movement closed up；When detecting the reduction for gap occur and plenum chamber (7- 5) in the rising with the reduction of bounce of pressure cannot synchronous continuity the case where when, stopping makes top bearing shell on aiding support component The movement that (7-1) and lower bearing (7-2) close up.

4. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: third It further include following technological means in step, during idler wheel (8-1) levels off to turbine spindle (9-3), acquisition rolling in real time (8-1) is taken turns at a distance from turbine spindle (9-3), it is identical at a distance from turbine spindle (9-3) to control each idler wheel (8-1)； After some idler wheel (8-1) in righting device assembly has contacted turbine spindle (9-3), turbine spindle (9- is acquired in real time 3) circular runout, if the circular runout of turbine spindle (9-3) no longer subtracts with the lasting feeding of three idler wheels (8-1) Small, then the feeding of idler wheel (8-1) stops.

5. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: the 5th Step further includes following technological means, make the bore area of air seal component at the top of movable vane to the outer surface turbine blade (6-12) During gathering, gap and the turbine blade of air sealing (6-11) and the outer surface turbine blade (6-12) are acquired in real time The vibration data of the circular runout of the outer surface (6-12) and vibrating sensor (8-5) acquisition, the numerical value to guarantee clearance t are big always In the numerical value of circular runout, increase extremely if there is vibration data, then counteragent increases air seal component at the top of movable vane immediately Bore area at a distance from turbine blade outer surface, when before vibration data being restored to abnormal increase, then recovery operation.

6. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: distance Sensor selects eddy current displacement sensor.

7. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: vibration Sensor selects moving-coil type vibrating speed sensors.

8. the method that jet sectional center frame vibration damping adjusts steam turbine sealing gland according to claim 2, it is characterised in that: righting The propulsion device (8-3) of device assembly includes rack gear (10-1), gear (10-2) and motor and retarder (10-3), in steam turbine every It is provided with cavity (10-6) in plate (10-4), rack gear (10-1), gear (10-2) and motor and retarder (10-3) are arranged in cavity In (10-6), rack gear (10-1) arranges that one end of rack gear (10-1) is pierced by cavity along perpendicular to the turbine spindle direction (9-3) It (10-6) and is mutually fixed with push rod (8-2), the cross section of the rack gear (10-1) is rectangle, and cavity (10-6) is at rack gear (10-1) The position being pierced by forms the guide slide (10-7) that cross section is rectangle, sets in the cavity (10-6) of the other end of rack gear (10-1) It sets guide sleeve (10-8), guide slide (10-7) and guide sleeve (10-8) ensure that the movement and positioning accuracy of rack gear (10-1), Gear (10-2) is meshed with rack gear (10-1), and the gear shaft of gear (10-2) is connected to the output of motor and retarder (10-3) On axis, the idler wheel (8-1) is adjacent with partition air sealing (10-5).

9. the device of jet sectional center frame vibration damping adjusting steam turbine sealing gland, it is characterised in that described device includes aiding support group Part and righting device assembly, aiding support component and righting device assembly are arranged on adjacent partition inner hole；

The aiding support component includes top bearing shell, lower bearing and radial propulsion device, the Inner arc table of top bearing shell and lower bearing Face is provided with uniformly distributed micro- stomata, and the inlet end of micro- stomata is respectively communicated with the height being arranged on the external arc surface of top bearing shell and lower bearing Plenum chamber, micro- stomata and plenum chamber form air-channel system, and plenum chamber is communicated with micro- stomata makes the interior of top bearing shell and lower bearing Surface forms air cushion, and the outer surface of plenum chamber and the front end surface of radial propulsion device are fixed, and radial propulsion device setting exists In the mounting hole opened on the bore area of partition；

The righting device assembly includes three idler wheels, three push rods, three propulsion devices, and three push rods are perpendicular to steamer owner Divide equally in the plane of axis in 120 degree and arranges；In push rod front end, the rear end of each push rod is arranged a propulsion and fills for idler wheel setting It sets, after idler wheel contacts turbine spindle, is contacted at line of the two to rolling.

10. the device that jet sectional center frame vibration damping according to claim 9 adjusts steam turbine sealing gland, it is characterised in that help The propulsion device (8-3) of positive device assembly includes rack gear (10-1), gear (10-2) and motor and retarder (10-3), in steam turbine It is provided with cavity (10-6) in partition (10-4), rack gear (10-1), gear (10-2) and motor and retarder (10-3) are arranged in chamber In body (10-6), rack gear (10-1) arranges that one end of rack gear (10-1) is pierced by chamber along perpendicular to the turbine spindle direction (9-3) It body (10-6) and is mutually fixed with push rod (8-2), the cross section of the rack gear (10-1) is rectangle, and cavity (10-6) is in rack gear (10- 1) position being pierced by forms the guide slide (10-7) that cross section is rectangle, and the cavity (10-6) of the other end of rack gear (10-1) is interior Setting guide sleeve (10-8), guide slide (10-7) and guide sleeve (10-8) ensure that movement and the positioning accurate of rack gear (10-1) Degree, gear (10-2) is meshed with rack gear (10-1), and the gear shaft of gear (10-2) is connected to motor and retarder (10-3) On output shaft, the idler wheel is adjacent with partition air sealing (10-5).