CN2789416Y - Reverse spiral-flow antiexciting steam sealing gland of turbine - Google Patents
Reverse spiral-flow antiexciting steam sealing gland of turbine Download PDFInfo
- Publication number
- CN2789416Y CN2789416Y CN 200520041731 CN200520041731U CN2789416Y CN 2789416 Y CN2789416 Y CN 2789416Y CN 200520041731 CN200520041731 CN 200520041731 CN 200520041731 U CN200520041731 U CN 200520041731U CN 2789416 Y CN2789416 Y CN 2789416Y
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- CN
- China
- Prior art keywords
- eddy flow
- guide plate
- ring gear
- sealing gland
- prewhirling
- 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.)
- Expired - Lifetime
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- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model relates to a journal gland seal of a high pressure turbine machine, particularly an anti-excitation gland seal device for a steam turbine. A reverse rotational flow anti-excitation gland seal device for the steam turbine comprises a tooth-shaped labyrinth gland seal, wherein the tooth-shaped labyrinth gland seal is composed of a tooth ring set arranged on a rotor and tooth ring sets arranged on a stator. The utility model is characterized in that the anti-excitation gland seal device also comprises prewhirl flow guide plates, and the prewhirl flow guide plates are arranged among the tooth ring sets at the cylindrical inner surface of the stator. The inlet angle of a channel of the prewhirl flow guide plates is consistent with incoming flow, the outlet angle of the channel of the prewhirl flow guide plates is consistent with reverse rotational flow and the degrees of the outlet angle and the inlet angle are 30 DEG to 60 DEG with an axial line. The utility model can reduce the excitation force of the gland seal, improve the stability of the rotor and has the characteristics of simple structure, reliable operation and low cost.
Description
(1) technical field
The utility model relates to the axle journal packing of high pressure turbine machinery, relates in particular to the sealing gland of anti-steam turbine exciting.Axle journal packing applicable to steam turbine high-pressure cylinder, high pressure turbine compressor, overcritical and supercritical turbine high pressure section.
(2) background technique
Steam turbine and turbocompressor extensively adopt mazy type flute profile axle envelope, in order to barrier gas working medium along axle journal pass cylinder from the high pressure side leakage to low voltage side, thereby raise the efficiency.Alternately series of thin ring vertically on flute profile packing likeness in form rotor journal and the stator cylinder.Under the driving of pressure reduction, gas working medium the crown gap location form speed higher sew mobile.Sew in order to reduce, the crown gap can not be too big, and simultaneously in order to guarantee the mutual grazing that is in operation of rotor and stator, the crown gap can not be too little.Sew flow through the crown gap after, in the packing cell that the adjacent teeth ring forms, develop into vortex, make the kinetic energy approach exhaustion that flows, and the pressure of cell has had significant decline than upstream adjacent chamber.Then, air-flow working medium reduces pressure once more at following one gland sealing gear point place, produces gas leakage and flows.By a series of packing ring gears, gas working medium is reduced to low pressure step by step from high pressure.Because the packing ring gear is a lot, the pressure reduction before and after each crown is limited, and the crown gap is less again, and the gas leakage flow has obtained restriction.
Gas flow in flute profile gland sealing gear intercuspal space and the gland steam pocket is very complicated, and the gas in the motion can produce periodic pneumatic excitation force to rotor.Just will cause the self-excited vibration of packing-rotor-support-foundation system when gas swashs when frequency and rotor frequency are in step with, or be called the gas excited vibration.For the turbomachinery that high pressure is worked down, the ring gear of axle journal packing is many, length big, the density height of gas working medium, and the possibility that the gas excited vibration takes place significantly increases.For this reason, must reduce pneumatic excitation force during the design packing, to keep security of operation as far as possible.
(3) summary of the invention
The purpose of this utility model is to provide a kind of reverse eddy flow to prevent steam turbine exciting sealing gland, and this anti-exciting sealing gland can reduce the packing excitation force, improves rotor stability, have simple in structure, reliable operation, the characteristics that cost is low.
The utility model is achieved in that a kind of reverse eddy flow prevents steam turbine exciting sealing gland, comprise the tooth-shape labyrinth packing, the tooth-shape labyrinth packing is made up of the ring gear group that is loaded on epitrochanterian ring gear group and be loaded on the stator, it is characterized in that anti-exciting sealing gland also comprises the guide plate of prewhirling, the guide plate of prewhirling is loaded between the ring gear group and ring gear group of stator internal surface of column, the guide plate channel entrance angle of prewhirling is consistent with incoming flow, the guide plate channel outlet of prewhirling angle is with oppositely eddy flow is consistent, and the angle of exit angle and inlet angle is for to become 30 ° to 60 ° with axis.
Above-mentioned reverse eddy flow is prevented steam turbine exciting sealing gland, and the described guide plate of prewhirling can be plane guide plate and bending guide plate.
Above-mentioned reverse eddy flow is prevented steam turbine exciting sealing gland, describedly is provided with the eddy flow groove at stator cylinder basal plane, and the eddy flow groove places under the ring gear group and by ring gear and cuts off; The line sensing of revolving of eddy flow groove is along reversing sub-sense of rotation from the high voltage terminal to the low voltage terminal.
The utility model is to adopt additional reverse cyclone technique to form anti-exciting sealing gland on tooth-shape labyrinth packing basis, and this sealing gland can reduce the circumferential speed in the packing, thereby reduces the pneumatic excitation force of gas wind flow.This sealing gland comprises prewhirl guide plate and wall eddy flow groove, swashs power thereby produce reverse eddy flow restriction gas.The utility model can reduce the packing excitation force, improves rotor stability, have simple in structure, reliable operation, the characteristics that cost is low.
(4) description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the anti-steam turbine exciting sealing gland structural representation of the reverse eddy flow of the utility model;
Fig. 2 is stator fin of labyrinth circumferentially deploying figure;
Fig. 3 is rotor fin of labyrinth circumferentially deploying figure;
Fig. 4 is the anti-exciting sealing gland radial section schematic representation of reverse eddy flow.
Among the figure: 1 stator (cylinder) ring gear, 2 eddy flow grooves, 3 guide plates (plane guide plate or bending guide plate) of prewhirling, 4 rotor ring gears, 5 plane guide plates, 6 bending guide plates.
(5) embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, a kind of reverse eddy flow is prevented steam turbine exciting sealing gland, comprises the tooth-shape labyrinth packing, the guide plate 3 of prewhirling, eddy flow groove 2.The tooth-shape labyrinth packing is made up of for 1 group the ring gear that is loaded on 4 groups of epitrochanterian ring gears and be loaded on the stator.The guide plate 3 of prewhirling is loaded between 1 group of 1 group of the ring gear of stator internal surface of column and the ring gear, and the guide plate 3 channel entrance angles of prewhirling are consistent with the air-flow of coming in, and the inlet angle of guide plate 3 passages is not necessarily identical before the different packing sections; The exit angle of guide plate 3 passages of prewhirling is with oppositely eddy flow is consistent, and the angle of exit angle and inlet angle is for to become 30 ° to 60 ° with axis, and inlet angle in the present embodiment and exit angle are 45 °.The guide plate 3 of prewhirling that is contained in the axle journal suction port is plane guide plate 5, is contained in the guide plate 3 of prewhirling between 1 group of 1 group of ring gear and the ring gear for bending guide plate 6, and guide plate 3 thickness are suitable with packing ring gear 1.Air communication is crossed guide plate 3 passages and is formed prewhirling of counter-rotor sense of rotation, enters gland sealing gear intercuspal space and gland steam pocket then.Oppositely eddy flow has reduced the pneumatic excitation force that produces in the packing.Pre-swirl effect can fade away after air flow stream was crossed some gland sealing gears, therefore in the ingress of next packing section the guide plate 3 of similarly prewhirling need be installed, and produced once more and oppositely prewhirled.
Referring to Fig. 1, Fig. 2, Fig. 4, be provided with eddy flow groove 2 at stator cylinder basal plane, eddy flow groove 2 needs to finish Milling Process earlier on the cylindrical basal plane of its stator before stator packing ring gear 1 is installed.The degree of depth of eddy flow groove 2 is less than the degree of depth of ring gear 1 embedding stator, nearly 45 ° of eddy flow corner connection.Stator packing ring gear 1 is installed after eddy flow groove 2 completion of processing, thereby the approach of ganging up of eddy flow groove 2 is cut off, air-flow only keeps producing reverse eddy flow in the adjacent gland steam pocket of rotor crown.The line sensing of revolving of eddy flow groove 2 is along reversing sub-sense of rotation from the high voltage terminal to the low voltage terminal.When air flow stream was crossed the crown gap, portion gas flowed along eddy flow groove 2, and the drive ambient gas forms reverse eddy flow.Eddy flow groove 2 can be arranged in any position in whole packing zone, is not subjected to the restriction of packing segmentation geometry, arranges very flexible.Employing stator wall eddy flow groove 2 can cause the increase of leak volume, but because eddy flow groove 2 is periodically cut off by stator ring gear 1, the gas leakage of ganging up formula can't take place.The increase of single crown gas leakage is relevant with the ratio in eddy flow groove 2 numbers and groove depth and crown gap, and when groove number and groove depth were little, the increase of sewing was limited.
Claims (4)
1. a reverse eddy flow is prevented steam turbine exciting sealing gland, comprise the tooth-shape labyrinth packing, the tooth-shape labyrinth packing is made up of the ring gear group that is loaded on epitrochanterian ring gear group and be loaded on the stator, it is characterized in that anti-exciting sealing gland also comprises the guide plate of prewhirling, the guide plate of prewhirling is loaded between the ring gear group and ring gear group of stator internal surface of column, the guide plate channel entrance angle of prewhirling is consistent with incoming flow, the guide plate channel outlet of prewhirling angle is with oppositely eddy flow is consistent, and the angle of exit angle and inlet angle is for to become 30 ° to 60 ° with axis.
2. reverse eddy flow according to claim 1 is prevented steam turbine exciting sealing gland, and the guide plate that it is characterized in that prewhirling can be plane guide plate and bending guide plate.
3. reverse eddy flow according to claim 1 and 2 is prevented steam turbine exciting sealing gland, it is characterized in that being provided with the eddy flow groove at stator cylinder basal plane, and the eddy flow groove places under the ring gear group and by ring gear and cuts off.
4. reverse eddy flow according to claim 3 is prevented steam turbine exciting sealing gland, it is characterized in that the line sensing of revolving of eddy flow groove is along reversing sub-sense of rotation from the high voltage terminal to the low voltage terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041731 CN2789416Y (en) | 2005-05-20 | 2005-05-20 | Reverse spiral-flow antiexciting steam sealing gland of turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041731 CN2789416Y (en) | 2005-05-20 | 2005-05-20 | Reverse spiral-flow antiexciting steam sealing gland of turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2789416Y true CN2789416Y (en) | 2006-06-21 |
Family
ID=36789747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520041731 Expired - Lifetime CN2789416Y (en) | 2005-05-20 | 2005-05-20 | Reverse spiral-flow antiexciting steam sealing gland of turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2789416Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847689A (en) * | 2015-05-04 | 2015-08-19 | 亿昇(天津)科技有限公司 | Active centrifugal blower sealing structure |
| CN104895829A (en) * | 2015-05-29 | 2015-09-09 | 江苏金通灵流体机械科技股份有限公司 | Air seal device |
| CN109538309A (en) * | 2018-10-19 | 2019-03-29 | 中国船舶重工集团公司第七〇九研究所 | A kind of shaft end self sealing structure of high revolving speed High Pressure Difference |
| CN110242360A (en) * | 2018-03-08 | 2019-09-17 | 三菱重工业株式会社 | Movable vane piece side-sealing device, stator blade side-sealing device and rotating machinery |
| CN113606344A (en) * | 2021-07-30 | 2021-11-05 | 西安交通大学 | Labyrinth seal based on optimized rotor dynamic characteristics of inter-tooth anti-rotation plate |
-
2005
- 2005-05-20 CN CN 200520041731 patent/CN2789416Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847689A (en) * | 2015-05-04 | 2015-08-19 | 亿昇(天津)科技有限公司 | Active centrifugal blower sealing structure |
| CN104895829A (en) * | 2015-05-29 | 2015-09-09 | 江苏金通灵流体机械科技股份有限公司 | Air seal device |
| CN110242360A (en) * | 2018-03-08 | 2019-09-17 | 三菱重工业株式会社 | Movable vane piece side-sealing device, stator blade side-sealing device and rotating machinery |
| CN110242360B (en) * | 2018-03-08 | 2022-01-28 | 三菱重工业株式会社 | Moving blade side sealing device, stationary blade side sealing device, and rotary machine |
| CN109538309A (en) * | 2018-10-19 | 2019-03-29 | 中国船舶重工集团公司第七〇九研究所 | A kind of shaft end self sealing structure of high revolving speed High Pressure Difference |
| CN109538309B (en) * | 2018-10-19 | 2021-05-04 | 中国船舶重工集团公司第七一九研究所 | Shaft end self-sealing structure with high rotating speed and high pressure difference |
| CN113606344A (en) * | 2021-07-30 | 2021-11-05 | 西安交通大学 | Labyrinth seal based on optimized rotor dynamic characteristics of inter-tooth anti-rotation plate |
| CN113606344B (en) * | 2021-07-30 | 2022-12-09 | 西安交通大学 | Labyrinth seal based on optimized rotor dynamic characteristics of inter-tooth anti-rotation plate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI ELECTRIC POWER STATION EQUIPMENT CO.; PA Free format text: FORMER OWNER: SHANGHAI TURBINE CO., LTD.; PATENTEE Effective date: 20080509 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080509 Address after: No. 188, Chun Chun Road, Shanghai, Minhang District: 201100 Co-patentee after: Shanghai Jiao Tong University Patentee after: Shanghai electric power plant equipment Co., Ltd. Address before: No. 333, Jiangchuan Road, Shanghai, Minhang District: 200240 Co-patentee before: Shanghai Jiao Tong University Patentee before: Shanghai steam turbine Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150520 Granted publication date: 20060621 |