CN113931701A - Last blade fixing method and fixing structure - Google Patents
Last blade fixing method and fixing structure Download PDFInfo
- Publication number
- CN113931701A CN113931701A CN202111165976.0A CN202111165976A CN113931701A CN 113931701 A CN113931701 A CN 113931701A CN 202111165976 A CN202111165976 A CN 202111165976A CN 113931701 A CN113931701 A CN 113931701A
- Authority
- CN
- China
- Prior art keywords
- blade
- screw
- rotor
- side wall
- last blade
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 230000014759 maintenance of location Effects 0.000 claims 1
- 239000000945 filler Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/3053—Fixing blades to rotors; Blade roots ; Blade spacers by means of pins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a fixing method and a fixing structure of a last blade, wherein the fixing method comprises the following steps: (a) inserting the last blade into a last blade slot of the rotor, wherein the last blade slot is arranged on a circumferential side wall of the rotor; (b) drilling screw holes at the two opposite sides of the last blade and the matching position of the last blade and the last blade groove, and tapping the screw holes respectively; (c) screwing the screws into the screw holes respectively, and screwing the screws until the screws cannot be screwed; according to the invention, the last blade is directly fixed on the circumferential side surface of the rotor through the screw in the axial direction of the rotor, so that the processing is simple, the installation is convenient, and the interference of the rotor interstage clearance on the installation screw is eliminated; and need move back the sword after the screw tap tapping, can influence the quality of screw hole bottom screw thread, can be through setting up the steel ball in the bottom of screw hole to compress tightly the steel ball through the screw, can accurately judge the elasticity degree of screw, and avoid the screw thread of screw hole bottom to cause the influence to the fixed precision of screw, fastening is effectual.
Description
Technical Field
The invention relates to the technical field of steam turbine assembly, in particular to a method and a structure for fixing a last blade.
Background
The blades are key parts of the operation of the steam turbine and are in large number. For a stage of a steam turbine, the blades of the steam turbine are generally divided into standard blades and last blades.
The last blade refers to the last stage blade of the steam process in the steam turbine. The steam works in the turbine, the pressure and temperature are reduced, the volume is expanded, and the steam pressure of the last stage is the lowest, the required volume flow is the highest, so that the last blade is the longest one of the blades of the turbine and bears the largest centrifugal force load and the stress generated by the centrifugal force load.
The fixation of the last blade is usually fixed by pins parallel to the axial direction of the rotor, belonging to a more mature fixation structure. However, if the gap between the rotor stages is not enough, the problems of inconvenient processing, difficult installation of the pin and complex installation are easily caused.
Disclosure of Invention
Based on the above description, the invention provides a method and a structure for fixing the last blade, wherein the last blade is directly fixed on the circumferential side surface of the rotor through the screw along the axial direction of the rotor, so that the method and the structure are simple to process and convenient to install, and the interference of the rotor interstage gap on the installation screw is eliminated.
The technical scheme for solving the technical problems is as follows: a method of end blade fixation comprising the steps of:
(a) inserting an end blade into an end blade slot of a rotor, wherein the end blade slot is disposed on a circumferential sidewall of the rotor;
(b) drilling screw holes at the two opposite sides of the final blade and the matching positions of the final blade and the final blade groove, and respectively tapping the screw holes;
(c) and screwing screws into the screw holes respectively, and screwing the screws until the screws cannot be screwed.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, step (c) is preceded by:
(c1) placing steel balls into the screw holes.
Further, the step (c) is followed by:
(c2) and cutting off the part of the screw protruding out of the circumferential side wall of the rotor to enable the top of the screw to be flush with the circumferential side wall of the rotor.
Further, in the step (b), the screw holes are respectively located at two sides of the last blade parallel to the axial direction of the rotor.
The invention also provides a last blade fixing structure, which comprises a rotor and a last blade, wherein a last blade groove is formed in the circumferential side wall of the rotor; the last blade comprises a blade root, a blade body and a shroud band, the blade root is fixed at the bottom end of the blade body, and the shroud band is fixed at the top end of the blade body; the blade root is inserted into the end blade groove; screw holes are arranged between the side wall of the blade root and the inner wall of the end blade groove, and the screw holes extend along the radial direction of the rotor; and screws are arranged in the screw holes, one side of each screw is in threaded connection with the side wall of the blade root, and the other opposite side of each screw is in threaded connection with the inner wall of the tail blade groove.
Furthermore, two opposite sides of the blade root are respectively provided with an installation part, and the top surfaces of the two installation parts are respectively flush with the circumferential side wall of the rotor; the screws are respectively arranged on one sides of the two installation parts far away from each other.
Further, the top of screw with the circumference lateral wall of rotor and the top surface parallel and level of installation department.
Furthermore, the two installation parts are respectively positioned at two sides of the blade root parallel to the axial direction of the rotor.
Further, a filler piece is provided between a bottom end of the screw and a bottom end of the screw hole, and the screw presses the filler piece against the bottom end of the screw hole.
Further, the filler piece is a steel ball.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
1. according to the invention, the last blade is directly fixed on the circumferential side surface of the rotor through the screw in the axial direction of the rotor, so that the processing is simple, the installation is convenient, and the interference of the rotor interstage clearance on the installation screw is eliminated;
2. need move back the sword behind the screw tap tapping, can influence the quality of screw hole bottom screw thread, through set up the steel ball in the bottom of screw hole to compress tightly the steel ball through the screw, can accurately judge the elasticity degree of screw, and avoid the screw thread of screw hole bottom to cause the influence to the fixed precision of screw, fastening is effectual.
Drawings
Fig. 1 is a schematic structural diagram of a fixing structure of an end blade according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of the last blade in an embodiment of the present invention;
FIG. 3 is a schematic structural view of a tip groove according to an embodiment of the present invention;
FIG. 4 is a schematic view of the location of the screw hole drilling on the root of the last blade in an embodiment of the present invention;
FIG. 5 is a schematic view of the position of the screw holes on the rotor for drilling in the embodiment of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a rotor; 11. a leaf groove; 2. a last leaf; 21. a blade root; 211. an installation part; 22. a leaf body; 23. a shroud ring; 3. screw holes; 4. a screw; 5. and (5) steel balls.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that spatial relationship terms, such as "under", "below", "beneath", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
Example one
A method of fixing an end blade for fixing an end blade 2 to a rotor 1, comprising the steps of:
(a) the last blade 2 is inserted into the last blade groove 11 of the rotor 1, wherein the last blade groove 11 is arranged on the circumferential side wall of the rotor 1.
(b) And drilling screw holes 3 at the two opposite sides of the tail blade 2 and the matching position of the tail blade 2 and the tail blade groove 11, and tapping the screw holes 3 respectively. Preferably, the screw holes 3 are respectively located on both sides of the last vane 2 in parallel with the axial direction of the rotor 1.
(c1) The steel ball 5 is put into the screw hole 3.
(c) Screws 4 are screwed into the screw holes 3, respectively, and the screws 4 are tightened until the screws 4 cannot be screwed.
(c2) The part of the screw 4 protruding from the circumferential side wall of the rotor 1 is cut off, so that the top of the screw 4 is flush with the circumferential side wall of the rotor 1.
Example two
An end blade fixing structure comprises a rotor 1 and an end blade 2, wherein an end blade groove 11 for mounting the end blade 2 is formed in the circumferential side wall of the rotor 1. The last blade 2 comprises a blade root 21, a blade body 22 and a shroud 23, wherein the blade root 21 is fixed at the bottom end of the blade body 22 and the shroud 23 is fixed at the top end of the blade body 22.
The blade root 21 is inserted into the end blade slot 11, and the two opposite sides of the blade root 21 are respectively provided with a mounting portion 211, and the top surfaces of the two mounting portions 211 are flush with the circumferential side walls of the rotor 1 respectively.
Screw holes 3 are arranged between the side wall of the blade root 21 and the inner wall of the final blade groove 11, and the screw holes 3 extend along the radial direction of the rotor 1. In this embodiment, the screw holes 3 are respectively provided on the sides of the two mounting portions 211 away from each other, and half of the screw holes 3 are located on the mounting portions 211 and the other half are located on the rotor 1. The screws 4 are arranged in the screw holes 3, one side of each screw 4 is in threaded connection with the side wall of the blade root 21, and the other opposite side of each screw 4 is in threaded connection with the inner wall of the last blade groove 11, so that the last blade 2 is fixed on the rotor 1.
The quality of the threads at the bottom of the screw hole 3 is affected due to the fact that the screw needs to be withdrawn after the tapping of the screw tap. Therefore, a filler piece is provided between the bottom end of the screw 4 and the bottom end of the screw hole 3, and the filler piece is pressed against the bottom end of the screw hole 3 by the screw 4. Preferably, the shim is a ball-shaped steel ball 5, so that the screw 4 can be stably pressed against the shim. Set up steel ball 5 through the bottom at screw hole 3, can accurately judge the elasticity degree of screw 4 to avoid the screw thread of screw hole 3 bottom to cause the influence to the fixed precision of screw 4, the fastening effect is better.
Because the length of the screw 4 is greater than the depth of the screw hole 3, after the screw 4 is screwed down, the excessive part of the screw 4 protruding out of the circumferential side wall of the rotor 1 needs to be cut off, so that the top end of the screw 4 is flush with the circumferential side wall of the rotor 1 and the top surface of the mounting part 211.
The fixing method and the fixing structure of the end blade are simple to process and convenient to install; and optimize the screw tapping, can accurately judge the screw elasticity degree, fasten effectually.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of end blade retention, comprising the steps of:
(a) inserting an end blade (2) into an end blade slot (11) of a rotor (1), wherein the end blade slot (11) is arranged on a circumferential side wall of the rotor (1);
(b) drilling screw holes (3) at the two opposite sides of the end blade (2) and at the matching positions of the end blade (2) and the end blade groove (11), and respectively tapping the screw holes (3);
(c) screwing screws (4) into the screw holes (3), respectively, and tightening the screws (4) until the screws (4) cannot be screwed.
2. The method of claim 1, further comprising, prior to step (c):
(c1) and placing the steel ball (5) into the screw hole (3).
3. The tip blade securing structure according to claim 1, further comprising after said step (c):
(c2) and cutting off the part of the screw (4) protruding out of the circumferential side wall of the rotor (1) to enable the top of the screw (4) to be flush with the circumferential side wall of the rotor (1).
4. An end blade fixing structure according to claim 1, wherein in the step (b), the screw holes (3) are respectively located on both sides of the end blade (2) in parallel with the axial direction of the rotor (1).
5. The end blade fixing structure is characterized by comprising a rotor and an end blade, wherein an end blade groove (11) is formed in the circumferential side wall of the rotor (1); the last blade (2) comprises a blade root (21), a blade body (22) and a shroud band (23), the blade root (21) is fixed at the bottom end of the blade body (22), and the shroud band (23) is fixed at the top end of the blade body (22); the blade root (21) is inserted into the tip blade groove (11); screw holes (3) are formed between the side wall of the blade root (21) and the inner wall of the end blade groove (11), and the screw holes (3) extend along the radial direction of the rotor (1); all install screw (4) in screw hole (3), one side of screw (4) with the lateral wall threaded connection of blade root (21), opposite side with the inner wall threaded connection of end blade groove (11).
6. An end blade fixing structure as claimed in claim 5, characterised in that the blade root (21) is provided with mounting portions (211) on opposite sides thereof, the top surfaces of the two mounting portions (211) being flush with the circumferential side wall of the rotor (1), respectively; the screws (4) are respectively arranged on one sides of the two installation parts (211) far away from each other.
7. An end blade fixing arrangement as claimed in claim 6, characterised in that the tip of the screw (4) is flush with the circumferential side wall of the rotor (1) and the top surface of the mounting portion (211).
8. An end blade fixing arrangement according to claim 6, characterised in that the two mounting portions (211) are located on either side of the blade root (21) parallel to the axial direction of the rotor (1).
9. An end blade fixing structure according to claim 5, characterised in that a shim is provided between the bottom end of the screw (4) and the bottom end of the screw hole (3), and the screw (4) compresses the shim against the bottom end of the screw hole (3).
10. An end-blade fixation arrangement as claimed in claim 9, wherein the shim is a steel ball (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111165976.0A CN113931701A (en) | 2021-09-30 | 2021-09-30 | Last blade fixing method and fixing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111165976.0A CN113931701A (en) | 2021-09-30 | 2021-09-30 | Last blade fixing method and fixing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113931701A true CN113931701A (en) | 2022-01-14 |
Family
ID=79277891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111165976.0A Pending CN113931701A (en) | 2021-09-30 | 2021-09-30 | Last blade fixing method and fixing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113931701A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070297908A1 (en) * | 2006-06-23 | 2007-12-27 | Siemens Power Generation, Inc. | Turbine rotor blade groove entry slot lock structure |
| EP2149677A1 (en) * | 2008-07-30 | 2010-02-03 | Siemens Aktiengesellschaft | Attachment device for attaching a rotor blade to a rotor of a turbomachine |
| CN204041124U (en) * | 2014-09-17 | 2014-12-24 | 杭州汽轮机股份有限公司 | Steam turbine blade screw rod in last years of a century locking mechanism |
| CN110145372A (en) * | 2019-05-25 | 2019-08-20 | 立德动力设备(浙江)有限公司 | A kind of turbine rotor fork-shaped blade installation structure and its installation method |
| CN209875218U (en) * | 2019-04-13 | 2019-12-31 | 立德动力设备(浙江)有限公司 | Mounting structure of steam turbine rotor moving blade |
| CN214145583U (en) * | 2020-11-13 | 2021-09-07 | 立德动力设备(浙江)有限公司 | Self-tightening type locking device for last blade of steam turbine rotor |
-
2021
- 2021-09-30 CN CN202111165976.0A patent/CN113931701A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070297908A1 (en) * | 2006-06-23 | 2007-12-27 | Siemens Power Generation, Inc. | Turbine rotor blade groove entry slot lock structure |
| EP2149677A1 (en) * | 2008-07-30 | 2010-02-03 | Siemens Aktiengesellschaft | Attachment device for attaching a rotor blade to a rotor of a turbomachine |
| CN204041124U (en) * | 2014-09-17 | 2014-12-24 | 杭州汽轮机股份有限公司 | Steam turbine blade screw rod in last years of a century locking mechanism |
| CN209875218U (en) * | 2019-04-13 | 2019-12-31 | 立德动力设备(浙江)有限公司 | Mounting structure of steam turbine rotor moving blade |
| CN110145372A (en) * | 2019-05-25 | 2019-08-20 | 立德动力设备(浙江)有限公司 | A kind of turbine rotor fork-shaped blade installation structure and its installation method |
| CN214145583U (en) * | 2020-11-13 | 2021-09-07 | 立德动力设备(浙江)有限公司 | Self-tightening type locking device for last blade of steam turbine rotor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2717187C2 (en) | Fixing system, which is equipped with engine wall | |
| US6530731B2 (en) | Self-tapping insert, insert assembly, and method for mounting the insert | |
| US9845822B2 (en) | Attachment bolt for positive locking | |
| CN202985135U (en) | Processing jig of inner holes of thin-wall sleeve type elements | |
| CN110145372B (en) | Steam turbine rotor forked blade mounting structure and mounting method thereof | |
| CN101598167B (en) | Method and connection structure for preventing stud from rotating on substrate | |
| CN111316006B (en) | Active locking fastener | |
| CN204175749U (en) | A kind of captive screw of fast demountable | |
| CN113931701A (en) | Last blade fixing method and fixing structure | |
| CA2486027C (en) | Method and apparatus for adjusting impeller clearance in a pump | |
| CN102852952A (en) | Thread positioning locking mechanism and mounting method | |
| CN212225736U (en) | Bolt and fluid driving device | |
| CN217992227U (en) | Casing butt joint guiding device | |
| CN106246701A (en) | The securing member attachment structure of locating snap ring reinforced by a kind of band | |
| CN209195914U (en) | Stop nut fastening assembly | |
| US9822693B2 (en) | Exhaust-gas turbocharger | |
| CN205908657U (en) | Bearing axle clearance adjusts locking device | |
| CN209503605U (en) | A kind of oil cooler processing connector perforating device | |
| CN221195635U (en) | Spacing connection structure | |
| CN201575027U (en) | Lock nut | |
| CN216044809U (en) | Positioning connecting device | |
| CN204878174U (en) | Location structure locks fast | |
| CN219388368U (en) | Fastening connection assembly | |
| CN220960577U (en) | Turbine rotor external member is changeed experimental frock that breaks | |
| CN218624950U (en) | Expansion bolt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |