CN219241996U

CN219241996U - Split-flow pressure-reducing steam seal structure of steam turbine

Info

Publication number: CN219241996U
Application number: CN202223185605.1U
Authority: CN
Inventors: 罗帆
Original assignee: Deyang Wanteng Machinery Manufacturing Co ltd
Current assignee: Deyang Wanteng Machinery Manufacturing Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-06-23
Anticipated expiration: 2032-11-29

Abstract

The utility model discloses a steam turbine split-flow decompression type steam seal structure, which particularly relates to the technical field of steam seal structures, and comprises a steam seal ring body, wherein the steam seal ring body comprises a plurality of steam seal components, the steam seal components comprise an arc plate, a plurality of mounting grooves are formed in the inner cambered surface of the arc plate along the axial direction, high teeth are detachably connected in the plurality of mounting grooves, a plurality of low teeth are arranged between every two high teeth, a plurality of mounting holes along the height direction of the arc plate are arrayed on the surface of the arc plate along the arc section direction, the plurality of mounting holes are communicated with the plurality of mounting grooves, a plurality of limiting holes are formed in the plurality of high teeth, bolts movably penetrate through the limiting holes of the plurality of high teeth and are in threaded connection with the tail ends of the mounting holes, gaps are formed between the top surfaces of the high teeth and the bottom surfaces of the mounting grooves, and split-flow decompression of steam is realized.

Description

Split-flow pressure-reducing steam seal structure of steam turbine

Technical Field

The utility model relates to the technical field of steam seal structures, in particular to a split-flow decompression type steam seal structure of a steam turbine.

Background

The steam seal is a steam sealing component in an engine and a steam turbine, and aims to seal the steam of the steam turbine and improve the utilization rate of the steam. In order to prevent the dynamic and static collision and abrasion of the sealing component and the main shaft, a gap is designed between the sealing component and the main shaft, so that the problem of increased steam leakage exists when the gap is too large, and the efficiency of the engine and the steam turbine is reduced. The gap is too small, so that dynamic and static friction is easy to cause, and accidents are caused. In order to achieve both, an air seal is introduced.

The traditional sealing modes in the prior art comprise a split pressure-reducing type gland seal, a labyrinth gland seal, a honeycomb type gland seal, a Bladeon gland seal and the like. Wherein: the split-flow decompression type steam seal adopts a comb tooth structure, the throttle point of the comb tooth steam seal is only between the tooth tips of the high teeth and the low teeth and the rotor, the pressure of steam is overlarge, the steam directly impacts on the high teeth or the low teeth to accelerate the deformation of the high teeth and the low teeth, and the service lives of the high teeth and the low teeth are reduced.

Disclosure of Invention

In order to solve the problems, the utility model provides a split-flow decompression type gland sealing structure of a steam turbine.

In order to achieve the above purpose, the utility model provides a split-flow decompression type gland sealing structure of a steam turbine, which comprises a gland sealing ring body arranged around a main shaft of the steam turbine, wherein the gland sealing ring body comprises a plurality of gland sealing components, each gland sealing component comprises an arc plate, a plurality of mounting grooves are formed in the inner cambered surface of each arc plate along the axial direction, a plurality of high teeth are detachably connected in each mounting groove, a plurality of low teeth are arranged between every two high teeth, a plurality of mounting holes along the height direction of each high teeth are arrayed on the surface of each arc plate along the arc section direction, each mounting hole is communicated with each mounting groove, each high tooth is provided with a plurality of limiting holes, a bolt is movably arranged in each mounting hole in a penetrating manner, each bolt sequentially penetrates through each limiting hole of each high tooth and is in threaded connection with the tail end of each mounting hole, gaps are formed between the top surface of each high tooth and the bottom surface of each mounting groove, each low tooth corresponds to a boss protruding at two ends of an expansion cavity of a rotor body of the main shaft of the steam turbine, and each high tooth corresponds to a central expansion cavity of the steam turbine rotor body.

The principle of the utility model is as follows: the steam seal components are sequentially arranged on the main shaft of the steam turbine, the steam seal components are used for forming a steam seal ring body, steam is divided into two parts after striking the side face of the first high tooth, the first part of steam sequentially passes through a gap between the high tooth and the middle of the steam expansion cavity of the rotor of the main shaft of the steam turbine and a gap between the low tooth and convex bosses at two ends of the steam expansion cavity of the rotor of the main shaft of the steam turbine, then is discharged out of the steam turbine, the second part of steam enters the mounting groove along the side face of the high tooth and passes through the gap between the top face of the high tooth and the bottom face of the mounting groove to wind to the other side face of the high tooth and enters the next mounting groove through the mounting hole, at this time, the second part of steam strikes the side face of the next high tooth and moves towards the bottom end of the high tooth and is opposite to the steam of the first part, so that kinetic energy is converted into heat energy, and the effect of pressure reduction is achieved.

In some embodiments, the intrados of the arc plate is provided with the second mounting groove on both sides of a plurality of the mounting grooves, two the second high teeth are all detachably connected in the second mounting groove, one of the second mounting grooves is communicated with a plurality of the mounting holes, the second high teeth in the second mounting groove communicated with the mounting holes are arranged to be in butt joint with the bolts, the second high teeth are arranged to strengthen the sealing effect of the steam seal, and the second high teeth in the second mounting groove communicated with the mounting holes are in butt joint with the bolts to strengthen the fixing effect of the high teeth and prevent steam from directly entering the mounting holes, so that the sealing effect is further strengthened.

In some embodiments, a plurality of sealing blocks are detachably connected in the mounting holes, and the plurality of sealing blocks are connected together through connecting strips so as to seal the mounting holes.

In some embodiments, the limiting hole is a threaded hole, the bolt is provided with multiple sections of threads, the multiple sections of threads of the bolt are respectively in threaded connection with the limiting hole, and the multiple sections of threads of the bolt are respectively in threaded connection with the corresponding limiting hole so as to limit the multiple high teeth.

In some embodiments, the high teeth include inclined portions and connecting portions, the limiting holes are formed in the connecting portions, and the inclined portions of the high teeth guide steam so that the steam can enter the corresponding mounting grooves more easily.

In some embodiments, the intrados of the arc plate is further provided with a decompression slot between the high teeth and the low teeth, the decompression slot is communicated with the mounting hole, steam impinges on the low teeth and then enters the decompression slot along with the side surface of the low teeth, part of the steam entering the decompression slot impinges on the next high teeth through the mounting hole, and the other part forms a revolving airflow in the decompression slot to offset the new steam so as to convert kinetic energy into kinetic energy, and further, the steam is split and decompressed.

In some embodiments, the low teeth are angled so that steam more readily enters the corresponding pressure relief groove.

In some embodiments, a second low tooth is obliquely arranged in the pressure reducing groove, and the direction of inclination of the second low tooth is opposite to that of the low tooth, so that the steam entering the pressure reducing groove forms negative pressure vortex under the action of the obliquely arranged second low tooth to generate suction effect on the steam.

The utility model provides one or more technical schemes, which at least have the following technical effects or advantages:

according to the split-flow pressure-reducing steam seal structure of the steam turbine, steam is divided into two parts after striking on the side face of the high tooth, the first part of steam is directly discharged from the bottoms of the high tooth and the low tooth in sequence, the second part of steam enters the mounting groove along the side face of the high tooth and passes through a gap between the top face of the high tooth and the bottom face of the mounting groove to wind to the other side face of the high tooth and enters the next mounting groove through the mounting hole, at the moment, the second part of steam strikes the side face of the next high tooth and moves towards the bottom end of the high tooth along with the side face of the high tooth and is opposite to the steam of the first part, so that kinetic energy is converted into heat energy, and the pressure reducing effect is achieved;

the two sides of the plurality of high teeth are also provided with second high teeth, wherein one second high tooth is abutted with the bolt, so that the fixing effect on the high teeth is enhanced, steam is prevented from directly entering the mounting hole, and the sealing effect is further enhanced;

the arc plate is also provided with a decompression groove, steam collides on the low teeth and then enters the decompression groove along with the side surface of the low teeth, one part of steam entering the decompression groove collides with the next high teeth through the mounting holes, and the other part forms rotary airflow in the decompression groove so as to offset the newly-entered steam, so that kinetic energy is converted into kinetic energy, and the steam is further split and decompressed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the description of the embodiments, which are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a vapor seal ring of the present utility model;

FIG. 2 is a cross-sectional view of the gland seal assembly of the present utility model;

FIG. 3 is a schematic steam flow diagram of a split-flow pressure-reducing gland seal structure of a steam turbine according to the present utility model.

In the figure, 1-gland ring body, 2-gland component, 3-arc board, 4-high tooth, 5-low tooth, 6-mounting hole, 7-bolt, 8-second high tooth, 9-sloping part, 10-connecting part, 11-decompression groove, 12-second low tooth, 13-slider.

Detailed Description

The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without undue effort.

In this application, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described herein, as well as features of various embodiments or examples, may be combined and combined by those skilled in the art without conflict.

The embodiment provides a turbine reposition of redundant personnel decompression formula gland seal structure, please refer to fig. 1 through 3, including gland seal ring body 1 that encircles the turbine main shaft setting, gland seal ring body 1 includes a plurality of gland seal assembly 2, gland seal assembly 2 package rubbing board 3, obviously, gland seal assembly 2 still includes slider 13 on the extrados of arc board 3, and arc board 3 passes through slider 13 and installs on the turbine main shaft, the intrados of arc board 3 is provided with a plurality of mounting grooves along the axis direction, and a plurality of all can dismantle in the mounting groove and be connected with high tooth 4, every two be provided with a plurality of low tooth 5 between the high tooth 4, the surface of arc board 3 is arrayed along the arc section direction and is had a plurality of mounting holes 6 along self direction of height, a plurality of mounting holes 6 all with a plurality of mounting groove intercommunication, a plurality of high tooth 4 all are provided with a plurality of spacing holes, the bolt 7 is worn to be equipped with in the mounting hole 6 activity, just bolt 7 passes a plurality of in proper order high tooth 4 spacing hole tail end and with mounting hole 6, the high tooth 4 is corresponding to the boss 4 the high tooth 5 of the turbine main shaft has the boss top surface and the expansion body, the turbine rotor has the expansion cavity corresponds to the high tooth 5.

The principle is as follows: the steam seal assemblies 2 are sequentially arranged on the main shaft of the steam turbine, the steam seal assemblies 2 are spliced to form a steam seal ring body 1, steam is impacted on the side face of the first high tooth 4 and then divided into two parts, the first part of steam sequentially passes through a gap between the high tooth 4 and the center of the steam expansion cavity of the rotor of the main shaft of the steam turbine and a gap between the low tooth 5 and bosses protruding at two ends of the steam expansion cavity of the rotor of the main shaft of the steam turbine and then is discharged out of the steam turbine, the second part of steam enters the mounting groove along the side face of the high tooth 4 and passes through a gap between the top face of the high tooth 4 and the bottom face of the mounting groove to wind the other side face of the high tooth 4 and enters the next mounting groove through the mounting hole 6, and at this time, the second part of steam impacts the side face of the next high tooth 4 and moves towards the bottom end of the high tooth 4 and is opposite to the steam of the first part, so that kinetic energy is converted into heat energy, and the pressure reducing effect is achieved.

In some embodiments, the intrados of the arc plate 3 is provided with second mounting grooves on two sides of the mounting grooves, two second mounting grooves are detachably connected with second high teeth 8, one of the second mounting grooves is communicated with a plurality of mounting holes 6, the second high teeth 8 in the second mounting grooves communicated with the mounting holes 6 are abutted with the bolts 7, the second high teeth 8 are arranged to strengthen the sealing effect of the steam seal, and the second high teeth 8 in the second mounting grooves communicated with the mounting holes 6 are abutted with the bolts 7 to strengthen the fixing effect of the high teeth 4 and prevent steam from directly entering the mounting holes 6, so that the sealing effect is further strengthened.

Preferably, a plurality of sealing blocks are detachably connected in the mounting holes 6, a plurality of sealing blocks are connected together through connecting strips, the sealing blocks are arranged to seal the mounting holes 6, and a plurality of sealing blocks are connected together through the connecting strips to facilitate the mounting and the dismounting of the sealing blocks. Further, the surface of the arc plate 3 is also provided with a receiving groove communicated with the plurality of mounting holes 6, and the connecting strip is received in the receiving groove.

In some embodiments, the limiting hole is a threaded hole, the plug pin 7 is provided with multiple sections of threads, the multiple sections of threads of the plug pin 7 are respectively in threaded connection with the limiting hole, and the multiple sections of threads of the plug pin 7 are respectively in threaded connection with the corresponding limiting hole so as to limit the multiple high teeth 4. Obviously, the clearance between the high teeth 4 and the mounting groove can be properly increased, so that the mismatch between the multi-section threads of the bolt 7 and the limit holes of the plurality of high teeth 4 is prevented, and the mounting cannot be completed.

Preferably, the high teeth 4 include an inclined portion 9 and a connecting portion 10, and the limiting hole is formed in the connecting portion 10, and the inclined portion 9 of the high teeth 4 guides the steam so that the steam can more easily enter the corresponding mounting groove.

In some embodiments, the intrados of the arc plate 3 further defines a pressure reducing groove 11 between the high teeth 4 and the low teeth 5, the pressure reducing groove 11 is communicated with the mounting hole 6, steam impinges on the low teeth 5 and then enters the pressure reducing groove 11 along with the side surface of the low teeth 5, a part of the steam entering the pressure reducing groove 11 impinges on the next high teeth 4 through the mounting hole 6, and another part forms a revolving airflow in the pressure reducing groove 11 to offset the new steam so as to convert kinetic energy into kinetic energy, and further, the steam is split and reduced. Preferably, the low teeth 5 are inclined so that steam more easily enters the corresponding pressure relief groove 11. Further, a second low tooth 12 is obliquely arranged in the pressure reducing groove 11, and the direction of inclination of the second low tooth 12 is opposite to that of the low tooth 5, so that the steam entering the pressure reducing groove 11 forms negative pressure vortex under the action of the obliquely arranged second low tooth 12 to generate suction effect on the steam.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims

1. The utility model provides a steam turbine reposition of redundant personnel decompression formula gland structure, its characterized in that, including gland ring body (1) that encircles the steam turbine main shaft setting, gland ring body (1) include a plurality of gland seal subassembly (2), gland seal subassembly (2) package rubbing board (3), the intrados of cambered board (3) is provided with a plurality of mounting grooves along the axis direction, and is a plurality of all can dismantle in the mounting groove and be connected with high tooth (4), every two be provided with a plurality of low teeth (5) between high tooth (4), the surface of cambered board (3) is along the arc direction array have a plurality of mounting holes (6) along self direction of height, a plurality of mounting hole (6) all with a plurality of mounting groove intercommunication, a plurality of high tooth (4) all are provided with a plurality of spacing holes, mounting hole (6) internal activity wears to be equipped with bolt (7), just bolt (7) pass a plurality of high tooth (4) spacing hole and with mounting hole (6) tail end threaded connection, high tooth (4) top surface and the corresponding between the rotor body (5) of high tooth (4) have the boss of the boss that the boss corresponds to the high rotor (5) the boss of the main shaft setting up.

2. The split-flow pressure-reducing steam seal structure of a steam turbine according to claim 1, wherein the intrados of the arc plate (3) is provided with second mounting grooves on both sides of a plurality of the mounting grooves, second high teeth (8) are detachably connected in the two second mounting grooves, one of the second mounting grooves is communicated with a plurality of the mounting holes (6), and the second high teeth (8) arranged in the second mounting grooves communicated with a plurality of the mounting holes (6) are abutted with the bolts (7).

3. The split-flow pressure-reducing steam seal structure of a steam turbine according to claim 2, wherein a plurality of sealing blocks are detachably connected in the mounting holes (6), and the sealing blocks are connected together through connecting strips.

4. The steam turbine split-flow pressure-reducing steam seal structure according to claim 1, wherein the limiting hole is a threaded hole, the bolt (7) is provided with a plurality of sections of threads, and the plurality of sections of threads of the bolt (7) are respectively in threaded connection with the limiting hole.

5. The split-flow pressure-reducing steam seal structure of a steam turbine according to claim 1, wherein the high teeth (4) comprise inclined portions (9) and connecting portions (10), and the limiting holes are formed in the connecting portions (10).

6. The split-flow pressure-reducing steam seal structure of a steam turbine according to claim 1, wherein a pressure reducing groove (11) is further formed between the Gao Chi (4) and the low teeth (5) on the intrados of the arc plate (3), and the pressure reducing groove (11) is communicated with the mounting hole (6).

7. A split and reduced pressure gland sealing structure for a steam turbine according to claim 6, wherein the low teeth (5) are inclined.

8. The split-flow pressure-reducing steam seal structure of a steam turbine according to claim 6, wherein a second low tooth (12) is further obliquely arranged in the pressure reducing groove (11), and the second low tooth (12) is opposite to the low tooth (5) in inclination direction.