CN208073566U - Intelligent radial clearance is scalable to escort sealing system - Google Patents
Intelligent radial clearance is scalable to escort sealing system Download PDFInfo
- Publication number
- CN208073566U CN208073566U CN201721808044.2U CN201721808044U CN208073566U CN 208073566 U CN208073566 U CN 208073566U CN 201721808044 U CN201721808044 U CN 201721808044U CN 208073566 U CN208073566 U CN 208073566U
- Authority
- CN
- China
- Prior art keywords
- tooth
- radial clearance
- escorts
- scalable
- packing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Radial clearance is scalable escorts sealing system for intelligence described in the utility model, is related to a kind of being applied to thermal power generation, nuclear power, steam-gas Combined turbine cycle body part.Intelligent radial clearance is scalable to escort sealing system, including rotor, diaphragm housing ring, at least two pieces of packing segments；Packing segment is loaded between rotor and diaphragm housing ring；Straight-tooth and high tooth are machined on packing segment；It is characterized in that：It is connected by spring between the packing segment；At least 2 high teeth are replaced by the replaceable tooth that escorts on packing segment, and it is embedded structure to escort tooth, and insert is in the caulking groove that packing segment inside processes.Radial clearance is reduced, steam kinetic energy is effectively reduced, to reduce interstage leakage.The utility model has the characteristics that structure novel, simple processing, improves unit output, reduce unit heat consumption, is safety, economical high, therefore belongs to that a kind of novel intelligent radial clearance integrate economy and practicability is scalable to escort sealing system.
Description
Technical field
Radial clearance is scalable escorts sealing system for intelligence described in the utility model, is related to a kind of firepower that is applied to and sends out
Electricity, nuclear power, steam-gas Combined turbine cycle body part.
Background technology
Requirement with international and national to energy-saving and emission-reduction is more and more tighter, and how to reduce the energy consumption level of power industry is pendulum
Vital task before eyes, China propose to control in 310g/kwh in 300MW grades of unit coal consumption levels of the year two thousand twenty, 600MW grades
Unit coal consumption level will be controlled in 290g/kwh.The equal standard configuration tradition stepped labyrinth structure vapour of Steam Turbine manufacture of domestic active service
Envelope carries out gap positioning by back rag iron spring, and after running after a period of time, flat spring failure is adjustable to lose
Property.It is seen by the thermal test data of unit different times, the thermal efficiency and heat consumption of Steam Turbine are running an overhaul life
Afterwards, significantly deteriorate.
In place of the deficiencies in the prior art：For Steam Turbine after start and stop several times, rotor generates impact and rub, diameter with packing
Permanently increase to gap, unit economy is caused to decline；And after shaft end gland seal radial clearance increases, make outside steam turbine steam inside
It is flow to bearing housing, makes EH Water in oil, rotor that cannot form oil film with bearing clearance, reduces unit operation safety.
The problem of in the presence of for the above-mentioned prior art, a kind of novel intelligent radial clearance of research and design are scalable
Sealing system is escorted, is the problems of in the prior art very necessary to overcome.
Invention content
In view of it is above-mentioned the problems of in the prior art, the purpose of this utility model is a kind of novel intelligence of research and design
It can radial clearance be scalable escorts sealing system.By reducing the radial clearance of packing segment and rotor, steam loss is reduced；It is logical
The radial clearance crossed between rotor and packing segment intelligently scales, and the warp of safety and the operation of steam turbine start and stop is effectively ensured
Ji property, and ensure the persistence of unit safety economic effect.
What the technical solution of the utility model was realized in：
Intelligence radial clearance described in the utility model is scalable to escort sealing system, including rotor, diaphragm housing ring, at least
Two pieces of packing segments；Packing segment is loaded between rotor and diaphragm housing ring；Straight-tooth and high tooth are machined on packing segment；Its feature exists
In：It is connected by spring between the packing segment；At least 2 high teeth are replaced by the replaceable tooth that escorts on packing segment
It changes, reduces radial clearance, steam kinetic energy is effectively reduced, to reduce interstage leakage.
Spring described in the utility model is column compression spring, is made of 718 alloys of Inconel；Tension force of spring with
The steam pressure interaction for acting on arc block back realizes that packing opens in steam turbine start and stop, vapour when load carrying
Envelope is closed.
The tooth described in the utility model that escorts is embedded structure；Escort the caulking groove that tooth insert is processed on the inside of packing segment
It is interior, it is easily changed, reduces accessory cost.
The material described in the utility model for escorting tooth is 0Cr15Mo ferrite materials, and thickness is processed upwards from high bottom of the tooth portion
Degree is 1.2mm, length 5.5mm；The tooth height for escorting tooth is higher than other straight-tooth 0.15mm, can make clearance control 0.20 ±
0.05mm further reduces radial clearance, reduces steam loss.
Straight-tooth described in the utility model is an integral structure with packing segment, is made certainly of 1Cr12Mo Refractory steel materials
It is secondary operation, transverse tooth thickness 0.25mm that downward 0.30mm is played at top.
Packing segment middle back described in the utility model adds milling air intake duct；It packing segment back symmetrically will be by two diameters
To gap adjusting hole.
The radial clearance of packing segment and rotor described in the utility model, control is in 0.20mm ± 0.05mm, to reduce
Steam loss；It is intelligently scaled by the radial clearance between rotor and packing segment, the safety of steam turbine start and stop is effectively ensured
With the economy of operation, and ensure the persistence of unit safety economic effect.
The unilateral gap of packing segment and diaphragm housing ring described in the utility model is 1.0mm.
Intelligence escorts the structure and working principle of packing
Intelligence escorts the flat spring that packing eliminates traditional packing back, and four spirals are mounted in packing segment endface
Spring, and one is milled out under vapour conduit free states, in spring in each packing segment back steam admission side centre position
Packing segment is in open configuration and far from rotor (see Fig. 1), when unit opens machine, with steam flow under the action of power
Increase, the steam pressure for acting on every circle packing segment back incrementally increases (see Fig. 2), when this pressure is enough that spring is overcome to answer
Whens power, frictional resistance etc., packing segment starts to progressively close off, until it is in running order, and remain between rotor minimum
Gap value runs (see Fig. 3):When shutdown, with the reduction of steam flow, under the action of spring stress, packing segment far from rotor,
The radial clearance of packing and rotor is set to reach maximum value.To ensure that packing stucking phenomena does not occur during closing, opening,
Increase packing segment " neck " and the gap at packing conduit.
Stressing conditions are as follows：
(1) closing forces：Steam admission side steam pressure p1 acts on the directed force F 1 of packing segment back generation, steam output side steam
Pressure p 2 acts on the directed force F 2 of packing segment back generation.
(2) opening force：When steam flows through the channel between gland sealing gear and rotor axial, the directed force F 3 and vapour that generated to packing
It seals between arc block end face, the directed force F 4 that pressing spring generates.
(3) frictional force：Frictional force F5 when packing segment is closed or opens between packing conduit.
When steam turbine starts, since the quantity of steam of entrance is few, the corresponding quantity of steam into packing segment back is also few, makees
Closing forces for packing segment back are with regard to small, at this moment：F1+F2<F3+F4-F5
For gland blocks under the action of opening force, each packing is in open configuration, far from rotor, between gland sealing gear and rotor
Radial clearance is larger, and (maximum value is that packing makes a concession gap and the sum of packing radial clearance when unit normal operation.Packing is made a concession
1.8~2.5mm of gap), touch mill so as to avoid rotor and gland sealing gear when crossing critical speed.
With the increase of Turbine Flow Path steam inlet, the closing forces for acting on packing segment back overcome effect
In the opening force and frictional force of packing flank, i.e.,：F1+F2>F3+F4+F5
Packing segment is closed step by step under the action of closing forces, and finally realizes the closing of gland blocks, is made gland sealing gear and is turned
The radial clearance of son minimizes value, and is kept.
Intelligence escorts packing in unit starting, when packing BOB(beginning of block) is step by step under 2~30% design discharges for steam flow
It closes；When shutting down, steam flow is reduced to 2~3%, and packing all opens.In this way, intelligence escorts packing and passes through packing segment
Open and close automatically, realize unit opens, the radial clearance of packing and rotor is adjustable in stopping process, avoid due to
The impact and rub generated is vibrated, the radial clearance of packing and rotor remains at smaller range in unit normal operation
It is interior, i.e. the lower limit of design value.
The utility model has the advantages that it will be apparent that being mainly manifested in：
1, the utility model is improved on traditional gland seal structure；I.e.：The rag iron spring at traditional packing back is eliminated,
To make radial clearance be realized in steam turbine start and stop and normal load carrying, intelligence is scalable；When packing opens between radial direction
Gap reaches 2.0mm, and radial clearance is 0.20mm when closing；Ensure that the intelligent scalable sealing system that escorts of radial clearance meets vapour
Turbine service requirement；
2, gap is increased between the packing segment and diaphragm housing ring of the utility model, unilateral gap is 1.0mm, ensures to pass through
Long-play, sealing system not bite；
3, it is embedded structure to escort tooth；It escorts in the caulking groove that tooth insert is processed on the inside of packing segment, is easily changed, subtracts
Few accessory cost.
4, the tooth section of escorting of the utility model is plane, even if escort tooth touches mill with rotor, since its material is
0Cr15Mo, it is difficult to it hardens, it is not easy to wear, rotor will not be injured, and the gaps 0.20 ± 0.05mm fortune can be maintained at for a long time
Row, to make steam turbine long-term safety economical operation.
5, the utility model is mainly used for turbine proper, reduces unit and leaks vapour, prevents bearing housing Water in oil, carry
High unit output reduces unit heat consumption；
6, the utility model can significantly improve safety and the economy of unit.
The utility model has structure novel, simple processing, improves unit output, reduces unit heat consumption, safety, economy
The advantages that type is high, high-volume, which puts goods on the market, will generate positive social benefit and significant economic benefit.
Description of the drawings
The utility model shares 1 width attached drawing, wherein：
It is attached that FIG. 1 is a schematic structural view of the utility model；
Attached drawing 2 is that the utility model intelligently escorts packing open state schematic diagram；
Attached drawing 3 is that the utility model intelligently escorts packing closed state schematic diagram.
In figure：1, rotor 2, diaphragm housing ring 3, packing segment 4, straight-tooth 5, spring 6, escort tooth 7, high tooth
Specific implementation mode
Specific embodiment of the utility model is as shown in the picture, and intelligent radial clearance is scalable to escort sealing system, packet
Include rotor 1, diaphragm housing ring 2, at least two pieces of packing segments 3；Packing segment 3 is loaded between rotor 1 and diaphragm housing ring 2；Packing segment 3 with
The unilateral gap of diaphragm housing ring 2 is 1.0mm, and molybdenum disulfide soil body lubricant is smeared on diaphragm housing ring 2, ensures that packing segment 3 is freely lived
It is dynamic；The radial clearance of packing segment 3 and rotor 1 is controlled in 0.20mm ± 0.05mm, to reduce steam loss；Add on packing segment 3
Work has straight-tooth 4 and high tooth 7, and the downward 0.30mm from top of straight-tooth 4 is secondary operation, transverse tooth thickness 0.25mm；Between packing segment 3 according to
It is connected by column compression spring 5, each packing segment 3 has steel seal number, determines installation site；The back of the body among packing segment 3
Portion adds milling air intake duct；It 3 back of packing segment symmetrically will be by two radial clearance adjusting holes.
At least 2 high teeth 7 are replaced by the replaceable tooth 6 that escorts on packing segment 3, and it is embedded structure to escort tooth 6；Shield
6 insert of tooth is defended in the caulking groove that 3 inside of packing segment processes；It is 1.2mm to escort tooth 6 and process thickness upwards from high bottom of the tooth portion, long
Degree is 5.5mm；The tooth height for escorting tooth 6 is higher than other straight-tooth 40.15mm, clearance control can be made in 0.20 ± 0.05mm, further
Radial clearance is reduced, steam loss is reduced.
The above, the only preferable specific implementation mode of the utility model, but the scope of protection of the utility model is simultaneously
Not limited to this, all those familiar with the art are in technical scope disclosed by the utility model, according to this reality
Being subject to equivalent substitution or change with the design of novel technical solution and its utility model should all cover in the utility model
Within protection domain.
Claims (8)
1. radial clearance is scalable escorts sealing system, including rotor (1), diaphragm housing ring (2), at least two pieces of packings for a kind of intelligence
Arc block (3)；Packing segment (3) is loaded between rotor (1) and diaphragm housing ring (2)；Straight-tooth (4) and height are machined on packing segment (3)
Tooth (7)；It is characterized in that：It is connected by spring (5) between the packing segment (3)；At least 2 on packing segment (3)
A high tooth (7) is replaced by the replaceable tooth (6) that escorts；The tooth height for escorting tooth (6) is higher than other straight-tooth (4) 0.15mm.
2. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the bullet
Spring (5) is column compression spring, is made of 718 alloys of Inconel.
3. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the shield
It is embedded structure to defend tooth (6)；It escorts in the caulking groove that tooth (6) insert is processed on the inside of packing segment (3).
4. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the shield
The material for defending tooth (6) is 0Cr15Mo ferrite materials, and it is 1.2mm, length 5.5mm to process thickness upwards from high bottom of the tooth portion.
5. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that described is straight
Tooth (4) is an integral structure with packing segment (3), and it is two that the downward 0.30mm from top, which is made, by 1Cr12Mo Refractory steel materials
Secondary processing, transverse tooth thickness 0.25mm.
6. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the vapour
Envelope arc block (3) middle back adds milling air intake duct；It packing segment (3) back symmetrically will be by two radial clearance adjusting holes.
7. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the vapour
The radial clearance of arc block (3) and rotor (1) is sealed, is controlled in 0.20mm ± 0.05mm.
8. radial clearance is scalable escorts sealing system for intelligence according to claim 1, it is characterised in that the vapour
The unilateral gap for sealing arc block (3) and diaphragm housing ring (2) is 1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721808044.2U CN208073566U (en) | 2017-12-21 | 2017-12-21 | Intelligent radial clearance is scalable to escort sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721808044.2U CN208073566U (en) | 2017-12-21 | 2017-12-21 | Intelligent radial clearance is scalable to escort sealing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208073566U true CN208073566U (en) | 2018-11-09 |
Family
ID=64033457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721808044.2U Active CN208073566U (en) | 2017-12-21 | 2017-12-21 | Intelligent radial clearance is scalable to escort sealing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208073566U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863994A (en) * | 2021-10-12 | 2021-12-31 | 华能(大连)热电有限责任公司 | Steam sealer with high sealing performance and assembling method thereof |
-
2017
- 2017-12-21 CN CN201721808044.2U patent/CN208073566U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863994A (en) * | 2021-10-12 | 2021-12-31 | 华能(大连)热电有限责任公司 | Steam sealer with high sealing performance and assembling method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205330740U (en) | Wide vapor seal of pressing drive sealed clearance self -adjusting is got by vapor seal intertooth space | |
| CN208073566U (en) | Intelligent radial clearance is scalable to escort sealing system | |
| CN204239765U (en) | A kind of labyrinth seal structure | |
| CN101749321B (en) | Thrust bearing used for booster | |
| CN201851172U (en) | Brandon steam seal and turbine | |
| CN105673091B (en) | A kind of seal clearance selfregulated glandpacking device with gas suspension effect | |
| CN209324437U (en) | A kind of steam turbine shaft end combination sealing gland | |
| CN203756242U (en) | Multiple labyrinth brush type vapor seal | |
| CN106703900A (en) | Novel self-adjustment spring type steam seal | |
| CN204804887U (en) | Airtight oil catch of steam turbine rotor shaft | |
| CN207568660U (en) | A kind of intensive toe joint touch packing | |
| CN2821163Y (en) | Self regulating honeycomb gas seal | |
| CN211344034U (en) | Mechanical sealing device of vapor compressor | |
| CN209212312U (en) | It is a kind of can unitary rotation the high pressure-bearing of low abrasion brush seal | |
| CN106854995A (en) | Coal gangue power generation factory turbine low pressure cylinder gland seal device | |
| CN203214391U (en) | Centrifugal fan sealing structure | |
| CN202708085U (en) | Pressure-maintaining motive sealing structure for continuously rotary heat accumulator | |
| CN203756241U (en) | Compound ring brush type vapor seal | |
| CN205587124U (en) | Coal pulverizer sealing device with reduce coal pulverizer air leakage coefficient function | |
| CN111005772A (en) | Servo suspension tooth brush type steam seal of steam turbine unit | |
| CN201858149U (en) | Non-contact seal type Roots fan | |
| CN214366222U (en) | Steam turbine composite shaft seal body with multi-tooth steam seal structure | |
| CN207960692U (en) | Actuating type packing | |
| CN103603803A (en) | Water vapor screw compressor shaft seal structure | |
| CN209586770U (en) | A kind of recirculated seal structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |