CN114483209B - Sealing structure of steam seal body at shaft end of steam turbine - Google Patents
Sealing structure of steam seal body at shaft end of steam turbine Download PDFInfo
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- CN114483209B CN114483209B CN202111610597.8A CN202111610597A CN114483209B CN 114483209 B CN114483209 B CN 114483209B CN 202111610597 A CN202111610597 A CN 202111610597A CN 114483209 B CN114483209 B CN 114483209B
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- steam
- carrier
- groove
- steam turbine
- steam seal
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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
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a sealing structure of a steam seal body at the shaft end of a steam turbine, which comprises a steam seal block, wherein an annular steam seal groove facing a rotor is arranged in the steam seal block, the annular steam seal groove comprises an outlet section and a containing section, and the width of the outlet section is smaller than that of the containing section; the carrier is arranged in the annular steam sealing groove, and the maximum width of the carrier is larger than the width of the outlet section; the fixing frame is arranged in the annular steam sealing groove and is fixedly connected with the top of the annular steam sealing groove; the fixed rod is provided with a baffle, and one end of the fixed rod is fixedly connected with the fixed frame; one end of the elastic piece is connected with the baffle plate, and the other end of the elastic piece is connected with the carrier; and one end of the suspension tooth is arranged at the bottom of the carrier, and the other end of the suspension tooth protrudes to the rotor to be matched with the rotor for steam sealing. The sealing structure of the steam seal body at the shaft end of the steam turbine can reduce the steam leakage, reduce the abrasion of the sealing teeth of the steam seal body and improve the integral sealing effect of the shaft end of the steam turbine.
Description
Technical Field
The invention relates to a sealing structure of a steam seal body at the shaft end of a steam turbine, and belongs to the technical field of steam seals of steam turbines.
Background
The steam turbine rotor has a gap between the moving part and the static part at the position of penetrating out of the cylinder, and because the pressure difference between the inside and the outside can cause steam to leak out and even flow into the bearing box, so that the water in the lubricating oil or the outside air leaks into to break the vacuum, the efficiency of the unit can be influenced by the steam leakage loss. In order to better solve the leakage phenomenon, sealing devices are arranged at the shaft ends of the steam turbine, and the traditional shaft end steam seal sealing type mainly comprises a labyrinth steam seal, a honeycomb steam seal, a brush type flexible gear steam seal and the like.
The existing traditional sealing device has large leakage quantity and is easy to abrade the surface of the rotor due to the structure, materials and the like.
Disclosure of Invention
The invention aims at: aiming at the problems, the invention provides the steam seal body sealing structure at the shaft end of the steam turbine, which can reduce the steam leakage, reduce the abrasion of sealing teeth of the steam seal body and improve the integral sealing effect of the shaft end of the steam turbine.
The technical scheme adopted by the invention is as follows:
the sealing structure of the steam seal body at the shaft end of the steam turbine comprises a steam seal block, wherein an annular steam seal groove facing to a rotor is arranged in the steam seal block, the annular steam seal groove comprises an outlet section and a containing section, and the width of the outlet section is smaller than that of the containing section;
the carrier is arranged in the annular steam sealing groove, and the maximum width of the carrier is larger than the width of the outlet section;
the fixing frame is arranged in the annular steam sealing groove and is fixedly connected with the top of the annular steam sealing groove;
the fixed rod is provided with a baffle, and one end of the fixed rod is fixedly connected with the fixed frame;
one end of the elastic piece is connected with the baffle plate, and the other end of the elastic piece is connected with the carrier;
and one end of the suspension tooth is arranged at the bottom of the carrier, and the other end of the suspension tooth protrudes to the rotor to be matched with the rotor for steam sealing.
Under the condition that gland sealing teeth are embedded on a gland sealing block of the existing gland sealing body and matched with a rotor, the structure is added in the gland sealing block, and when the suspended teeth are stressed, the carrier is pushed to slide upwards, so that the elastic piece is pushed, and the baffle is fixed, the elastic piece compresses to form a reaction force, so that the gland sealing between the suspended teeth and the rotor is ensured. According to the invention, the floating teeth can be freely retracted when being stressed, so that zero clearance sealing is realized to a certain extent, steam leakage is blocked, and the overall sealing performance is enhanced.
Preferably, the carrier comprises a first slide end matching the width of the receiving section and a second slide end matching the width of the outlet section.
In the scheme, the first sliding end is matched with the width of the accommodating section, so that the first sliding end is limited to slide up and down in the accommodating section; the second sliding end is matched with the width of the outlet section, so that the second sliding end is limited to slide in the outlet section, and the structural stability is ensured.
Preferably, the carrier is provided with two side walls, and spring pieces are symmetrically arranged on the two side walls; the fixing frame is symmetrically provided with supporting plates which incline to two sides, and the supporting plates are in elastic contact with the spring piece.
In the scheme, when the suspension teeth are stressed, the spring pieces at two sides of the carrier push the support plate, the support plate is fixed, the reaction force from the support plate pushes the spring pieces, the reaction force has reaction force of which the inclination angle is decomposed into a vertical direction and a horizontal direction, the vapor seal of the suspension teeth and the rotor is further ensured by the reaction force in the vertical direction, and the carrier is ensured to be more stable and prevented from shaking left and right when being stressed by the reaction force in the horizontal direction; wherein the symmetrical arrangement ensures a balance of forces.
Preferably, the two ends of the spring piece are fixedly connected with the side walls, so that the spring piece forms an arc shape.
Preferably, the side wall is provided with a groove, and the spring piece is fixed in the groove by welding or bolting.
Preferably, the suspension teeth are T-shaped, a T-shaped groove matched with the suspension teeth is formed in the bottom of the carrier, and the suspension teeth are assembled in the T-shaped groove.
In the scheme, the T-shaped suspension teeth are arranged at the bottom of the carrier by adopting the T-shaped grooves, so that the suspension teeth cannot slide off, and the carrier and the suspension teeth are separately designed, so that the carrier is simple and convenient to install, and the maintenance cost is reduced.
Preferably, the fixing rod and the elastic piece are uniformly arranged in a plurality along the circumferential direction.
In the scheme, a plurality of force applied to the suspension teeth in the circumferential direction is more balanced through the uniform arrangement in the circumferential direction.
Preferably, the elastic piece is fixedly connected with the baffle plate through welding.
Preferably, the fixing rod comprises a connecting rod and a guide rod, wherein the connecting rod and the guide rod are positioned at two ends of the baffle, the connecting rod is fixedly connected with the fixing frame, and the elastic piece is sleeved outside the guide rod.
In the scheme, the fixed rod is fixed through the connecting rod, and the elastic piece is guided and positioned through the guide rod, so that the spring is ensured not to deviate; the guide bar is not in contact with the carrier and has a compression distance.
Preferably, the carrier comprises a plurality of arc sections along the circumferential direction, and an expansion gap is arranged between two adjacent arc sections; the suspension teeth circumferentially comprise a plurality of arc sections matched with the carrier, and expansion gaps are arranged between two adjacent arc sections.
In the scheme, the carrier and the suspension teeth are of a sectional structure, a plurality of arc sections can be arranged according to the diameter of the rotor, the installation is convenient, and the expansion gap is arranged to ensure safe and stable operation after the expansion gap is heated and expanded.
Preferably, the annular steam seal groove is arranged in the middle of the steam seal block, and steam seal teeth positioned on two sides of the suspension teeth are arranged at the bottom of the steam seal block.
In the scheme, the steam seal teeth of the steam seal block and the rotor are subjected to preliminary steam seal, and the composite steam seal can be formed by matching with the suspension teeth of the steam seal block, so that the inherent defects of a single steam seal type can be overcome, steam leakage is better blocked and reduced, and the sealing performance is improved.
Preferably, the elastic member is a cylindrical compression spring.
According to the shaft end gland sealing body sealing structure of the steam turbine, preliminary gland sealing is carried out through the gland sealing teeth and the rotor, and the composite gland sealing is formed by matching with the suspension teeth; the multi-stage sealing structure can be arranged in the shaft end steam seal body according to the actual structural type of the turbine unit, and the arrangement of the multi-stage sealing structure is not limited to the arrangement of one stage.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the steam turbine unit performs preliminary steam sealing through the steam sealing teeth and the rotor, and the suspension teeth are contacted and sealed to form a composite steam seal, so that the inherent defects of a single steam sealing type are overcome, steam leakage can be better blocked and reduced, and the sealing performance is improved;
2. the suspension teeth belong to contact seal teeth, and can be freely retracted when being stressed, so that zero clearance seal is realized to a certain extent, steam leakage of the steam seal is blocked, and the overall sealing performance is enhanced;
3. the spring pieces on two sides of the carrier push the support plates on two sides of the fixing frame, so that the support plates push the spring pieces against the force, the suspension teeth are guaranteed to carry out steam sealing in the vertical direction of the reaction force, and the carrier is guaranteed to be more stable when stressed, and is prevented from shaking left and right in the horizontal direction;
4. the elastic piece is convenient to replace;
5. the T-shaped groove is matched with the T-shaped suspension teeth, so that the suspension teeth are safer in slipping phenomenon, the carrier and the suspension teeth are designed separately, the installation is simple and convenient, and the maintenance cost is reduced.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic illustration of a seal arrangement;
FIG. 2 is a schematic view of a gland groove of a gland block;
FIG. 3 is a schematic view of a carrier;
FIG. 4 is a schematic view of a securing lever;
fig. 5 is an overall schematic of the seal structure.
The marks in the figure: the device comprises a 1-gland block, a 2-fixed rod, a 3-elastic piece, a 4-carrier, 5-suspension teeth, a 6-fixed frame, 7-spring pieces, 8-rotors, 9-gland blocks, 11-gland grooves, 12-gland teeth, 21-baffles, 22-connecting rods, 23-guide rods, 41-first sliding ends, 42-second sliding ends, 43-grooves, 44-T-shaped grooves and 61-supporting plates.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
As shown in fig. 1 to 5, in a steam seal body sealing structure at a steam turbine shaft end of the present embodiment, a plurality of steam seal blocks 1 are provided between a steam seal body 9 and a rotor 8, wherein,
an annular steam seal groove 11 facing the rotor 8 is arranged in the steam seal block 1, the annular steam seal groove 11 comprises an outlet section and a containing section, the width of the outlet section is smaller than that of the containing section, and steam seal teeth 12 positioned on two sides of the suspension teeth 5 are arranged at the bottom of the steam seal block 1;
the carrier 4 is arranged in the annular vapor seal groove 11, the carrier 4 comprises a first sliding end 41 and a second sliding end 42, the first sliding end 41 is matched with the width of the containing section, and the second sliding end 42 is matched with the width of the outlet section; a T-shaped groove 44 is arranged at the bottom of the carrier 4;
the fixing frame 6 is arranged in the annular steam sealing groove 11 and is fixedly connected with the top of the annular steam sealing groove 11;
the fixed rod 2 is provided with a baffle 21, the fixed rod 2 comprises a connecting rod 22 and a guide rod 23 which are positioned at two ends of the baffle 21, the connecting rod 22 is connected with the fixed frame 6, and the guide rod 23 faces the carrier 4;
the elastic piece 3 is a cylindrical compression spring, one end of the elastic piece 3 is sleeved outside the guide rod 23 and connected with the baffle 21, and the other end of the elastic piece is connected with the carrier 4;
the suspension teeth 5 are T-shaped, one end of the suspension teeth 5 is arranged in the T-shaped groove 44, and the other end of the suspension teeth 5 protrudes to the rotor 8 to be matched with the rotor 8 for steam sealing.
In the embodiment, under the condition that the steam seal teeth 12 are embedded on the steam seal block 1 of the existing steam seal body 9 and matched with the rotor 8, the structure of the invention is added in the steam seal block 1, and when the suspension teeth 5 in the structure of the invention are stressed, the carrier 4 is pushed to slide upwards, so that the elastic piece 3 is pushed, and as the baffle 21 is fixed, the elastic piece 3 compresses to form a reaction force, so that the steam seal between the suspension teeth 5 and the rotor 8 is ensured. According to the invention, the floating teeth 5 can be freely retracted when being stressed, so that zero clearance sealing is realized to a certain extent, steam leakage is blocked, and the overall sealing performance is enhanced.
Example 2
The present embodiment further defines that the carrier 4 has two side walls on which the spring pieces 7 are symmetrically disposed on the basis of embodiment 1; the fixing frame 6 is symmetrically provided with support plates 61 inclined to two sides, and the support plates 61 are elastically contacted with the spring piece 7; when the suspension teeth 5 are stressed, the spring pieces 7 at the two sides of the carrier 4 push the support plates 61, the support plates 61 are fixed, the reaction force from the support plates 61 pushes the spring pieces 7, the reaction force has reaction force of which the inclination angle is decomposed into a vertical direction and a horizontal direction, the vapor seal of the suspension teeth 5 and the rotor 8 is further ensured by the reaction force in the vertical direction, and the carrier 4 is ensured to be more stable and avoid shaking left and right when being stressed by the reaction force in the horizontal direction;
the connecting rod 22 is welded with the fixed frame 6 into a whole; the side wall of the carrier 4 is provided with a groove 43, and two ends of the spring piece 7 are fixed in the groove 43 through welding or bolting, so that the spring piece 7 forms an arc shape.
As an alternative to the above embodiment, in other embodiments, the fixing rod 2 and the elastic member 3 are uniformly arranged in a plurality along the circumferential direction, so as to ensure that the forces applied to the floating teeth 5 in the circumferential direction are more uniform.
As an alternative to the above embodiment, in other embodiments, the elastic member 3 is fixedly connected to the baffle 21 by welding.
As an alternative to the above-described embodiments, in other embodiments, the carrier 4 comprises a plurality of arc segments in the circumferential direction, with an expansion gap being provided between adjacent arc segments; the floating teeth 5 comprise a plurality of arc sections matched with the carrier 4 along the circumferential direction, and expansion gaps are arranged between two adjacent arc sections.
As an alternative to the above-described embodiment, in other embodiments, an annular steam seal groove 11 is provided in the middle of the steam seal block 1.
In summary, by adopting the steam seal body sealing structure for the shaft end of the steam turbine, the steam seal teeth and the rotor are used for performing primary steam seal, and the suspension teeth are matched to form the composite steam seal, so that the steam leakage amount can be reduced, the abrasion of the steam seal body sealing teeth can be reduced, and the integral sealing effect of the shaft end of the steam turbine can be improved.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (9)
1. A steam turbine axle head gland seal body seal structure, its characterized in that: the rotary type steam seal device comprises a steam seal block (1), wherein an annular steam seal groove (11) facing a rotor (8) is formed in the steam seal block, the annular steam seal groove (11) comprises an outlet section and a containing section, and the width of the outlet section is smaller than that of the containing section;
the carrier (4) is arranged in the annular steam sealing groove (11), and the maximum width of the carrier (4) is larger than the width of the outlet section;
the fixing frame (6) is arranged in the annular steam sealing groove (11) and is fixedly connected with the top of the annular steam sealing groove (11);
the fixed rod (2) is provided with a baffle (21), and one end of the fixed rod (2) is fixedly connected with the fixed frame (6);
one end of the elastic piece (3) is connected with the baffle (21), and the other end of the elastic piece is connected with the carrier (4);
one end of the suspension tooth (5) is arranged at the bottom of the carrier (4), and the other end of the suspension tooth protrudes to the rotor (8) to be matched with the rotor (8) for steam sealing;
the carrier (4) is provided with two side walls, and spring pieces (7) are symmetrically arranged on the two side walls;
the fixing frame (6) is symmetrically provided with supporting plates (61) which incline to two sides, and the supporting plates (61) are elastically contacted with the spring piece (7).
2. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the carrier (4) comprises a first sliding end (41) and a second sliding end (42), the first sliding end (41) being matched with the width of the containing section, and the second sliding end (42) being matched with the width of the outlet section.
3. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the two ends of the spring piece (7) are fixedly connected with the side walls, so that the spring piece (7) forms an arc shape.
4. A steam turbine shaft-end gland sealing structure according to claim 3, wherein: the side wall is provided with a groove (43), and the spring piece (7) is fixed in the groove (43) through welding or bolting.
5. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the suspension teeth (5) are T-shaped, T-shaped grooves (44) matched with the carrier (4) are formed in the bottom of the carrier, and the suspension teeth (5) are assembled in the T-shaped grooves (44).
6. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the fixing rods (2) and the elastic pieces (3) are uniformly arranged in the circumferential direction.
7. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the fixing rod (2) comprises a connecting rod (22) and a guide rod (23) which are positioned at two ends of the baffle plate (21), the connecting rod (22) is fixedly connected with the fixing frame (6), and the elastic piece (3) is sleeved outside the guide rod (23).
8. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the carrier (4) comprises a plurality of arc sections along the circumferential direction, and an expansion gap is arranged between two adjacent arc sections; the suspension teeth (5) comprise a plurality of arc sections matched with the carrier (4) along the circumferential direction, and expansion gaps are arranged between two adjacent arc sections.
9. The steam turbine shaft-end gland sealing structure according to claim 1, wherein: the annular steam seal groove (11) is arranged in the middle of the steam seal block (1), and steam seal teeth (12) positioned on two sides of the suspension teeth (5) are arranged at the bottom of the steam seal block (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111610597.8A CN114483209B (en) | 2021-12-27 | 2021-12-27 | Sealing structure of steam seal body at shaft end of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111610597.8A CN114483209B (en) | 2021-12-27 | 2021-12-27 | Sealing structure of steam seal body at shaft end of steam turbine |
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| CN114483209A CN114483209A (en) | 2022-05-13 |
| CN114483209B true CN114483209B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111610597.8A Active CN114483209B (en) | 2021-12-27 | 2021-12-27 | Sealing structure of steam seal body at shaft end of steam turbine |
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| CA2884130A1 (en) * | 2012-09-07 | 2014-03-13 | Snecma | Device for sealing an opening of an enclosure wall for access to a rotary shaft |
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| CN114483209A (en) | 2022-05-13 |
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