CN108204253B - Cylinder for steam turbine - Google Patents
Cylinder for steam turbine Download PDFInfo
- Publication number
- CN108204253B CN108204253B CN201611185407.1A CN201611185407A CN108204253B CN 108204253 B CN108204253 B CN 108204253B CN 201611185407 A CN201611185407 A CN 201611185407A CN 108204253 B CN108204253 B CN 108204253B
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- China
- Prior art keywords
- cylinder body
- rotor
- blades
- steam
- cylinder
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Classifications
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
Abstract
The invention provides a cylinder for a steam turbine, which comprises a rotor, blades and a cylinder body, wherein the rotor is arranged in the cylinder body in a penetrating mode, one end of the cylinder body is sealed with the rotor, a space for accommodating the blades is formed between the other end of the cylinder body and the rotor, the blades comprise static blades and dynamic blades fixed with the rotor, the dynamic blades and the static blades are alternately arranged, the cylinder body is of a circumferential integral structure, a steam inlet cavity into which main steam enters is formed between the cylinder body and the rotor, the blades are arranged behind the steam inlet cavity, the static blades are fixed on a holding ring, the holding ring is formed by splicing two semi-circumferential rings, and the holding ring is abutted against the inner wall of the cylinder body. The cylinder body of the cylinder for the steam turbine adopts a circumferential whole-circle structure, so that the cylinder can bear high pressure difference and temperature.
Description
Technical Field
The invention relates to the technical field of steam power equipment, in particular to a cylinder for a steam turbine.
Background
According to "handbook of plant equipment for thermal power plants-second volume-steam turbine, machinery industry Press, 1998". The inner cylinder of a traditional steam turbine cylinder (containing 2 stages and above of static blades) is not of a full circle type and is of an upper half structure and a lower half structure (or a left half structure and a right half structure, or an upper half structure, a lower half structure, a left half structure and a right half structure, and the same is applied below). The purpose of the inner cylinder is to fit the rotor and vanes in the upper and lower halves. The connection mode of the upper half structure and the lower half structure comprises bolt connection and shrink ring connection. The upper half cylinder structure and the lower half cylinder structure are fastened by bolts or hot shrink rings, on one hand, the bolts or the hot shrink rings need to bear great stress, creep relaxation can be realized in a high-temperature and high-pressure difference environment, steam leakage on a middle split surface is easily caused, and therefore the applicable steam parameters cannot be too high. On the other hand, the split surface is a disconnected discontinuous structure, and most flange structures exist, so that the thermal stress is uneven in the starting and stopping process, and the starting and stopping performance is influenced.
In recent years, steam turbine cylinders have high parameter requirements, steam inlet parameters reach 25 MPa-38 MPa (for example, steam inlet at 35MPa/700 ℃), and some outer cylinders are of full-circle structures, but inner cylinders of fixed blades are still of upper and lower half structures, but the inner cylinders also need to bear high pressure difference (for example, more than 15 MPa) under the high parameter. At this time, the strength of the upper and lower half cylinders is problematic or the start-stop performance is poor.
Therefore, there is a need for a steam turbine cylinder that is adaptable to high steam parameters and has good start-stop performance.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention provides a steam turbine cylinder, which is used for solving the problems of strength and poor start-stop performance of the steam turbine cylinder under high steam parameters in the prior art.
In order to achieve the above and other related objects, the present invention provides a steam cylinder for a steam turbine, including a rotor, blades and a cylinder body, wherein the rotor is inserted into the cylinder body, one end of the cylinder body is sealed with the rotor, a space for accommodating the blades is provided between the other end of the cylinder body and the rotor, the blades include stationary blades and moving blades fixed to the rotor, the moving blades and the stationary blades are alternately arranged, the cylinder body is a circumferential integral structure, a steam inlet chamber into which main steam enters is provided between the cylinder body and the rotor, the blades are disposed behind the steam inlet chamber, the stationary blades are fixed on a holding ring, the holding ring is formed by splicing two semi-circumferential rings or more than two arc sections, and the holding ring is abutted against the inner wall of the cylinder body.
Preferably, the holding ring is fixedly connected with the cylinder body through a fixing piece.
Preferably, the outside of cylinder body still overlaps and is equipped with the outer cylinder body, and the outer cylinder body is circumference confined integral type structure, and perhaps the outer cylinder body is formed by two semi-circumference cylinder body concatenations.
Preferably, the rear part of the cylinder body is also provided with an extension cylinder body used as an exhaust cylinder, the inner wall of the extension cylinder body is fixed with a static blade, and the extension cylinder body is formed by splicing two semi-circumference cylinder bodies.
Preferably, the cylinder body is connected with the extension cylinder body through a connecting piece.
Preferably, the steam flow direction in the cylinder body is one-way, and the steam enters from the steam inlet chamber and then flows out through the space at the position of the blade.
Preferably, the cylinder block is made of a nickel-based high-temperature material.
Preferably, the rotor has a circumferentially projecting balance piston portion thereon, the balance piston being adjacent the steam intake chamber.
Preferably, the rotor has a circumferentially projecting balance piston portion thereon, the balance piston being located on the exhaust side remote from the steam intake chamber.
Preferably, the contact surface between the cylinder body and the holding ring is a conical surface, and the conical surface is inclined along the axial direction of the rotor, and the diameter of the conical surface is smaller as the conical surface is closer to the steam inlet chamber.
As described above, the cylinder for a steam turbine according to the present invention has the following advantageous effects: the cylinder body adopts a circumferentially closed integrated structure, can bear high pressure difference and temperature, and is suitable for high parameters, such as steam inlet parameters of 25-38 MPa; the cylinder is circumferentially closed, namely a whole-circle structure, has no mid-split steam leakage, and does not need connecting pieces such as mid-split bolts or hot lantern rings, so that the cylinder has good start-stop performance.
Drawings
Fig. 1 is a schematic view showing a first embodiment of the cylinder for a steam turbine of the present invention.
Fig. 2 is a schematic view showing a second embodiment of the cylinder for a steam turbine of the present invention.
Fig. 3 is a schematic view showing a third embodiment of the cylinder for a steam turbine of the present invention.
Description of the element reference numerals
1 rotor
1a balance piston
2 Cylinder body
3 stationary blade
4 moving blade
5 holding ring
6 outer cylinder body
7 fixing piece
8 connecting piece
9 steam inlet chamber
2a extension cylinder
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 3. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1, 2 and 3, the present invention provides a cylinder for a steam turbine, including a rotor 1, blades and a cylinder body 2, wherein the rotor 1 is inserted into the cylinder body 2, one end of the cylinder body 2 is sealed with the rotor 1, a space for accommodating the blades is provided between the other end of the cylinder body 2 and the rotor, the blades include stationary blades 3 and moving blades 4 fixed to the rotor 1, the moving blades 4 and the stationary blades 3 are alternately arranged, the cylinder body 2 is a circumferential integral structure, i.e., a circumferential closed integral structure, also called a full-circle structure, a steam inlet chamber 9 into which main steam enters is provided between the cylinder body 2 and the rotor 1, the blades are arranged behind the steam inlet chamber, the stationary blades 3 are fixed on a holding ring 5, the holding ring 5 is formed by splicing two half-circumference rings, and the holding ring 5 is tightly abutted against the inner wall of the cylinder body. The invention adopts a circumferentially closed whole-circle cylinder body which can bear very high pressure difference and temperature and is suitable for high parameters, such as steam inlet parameters reaching 25 MPa-38 MPa; the cylinder is circumferentially closed, namely a whole-circle structure, has no mid-split steam leakage, does not need connecting pieces such as mid-split bolts or hot lantern rings and the like, and therefore, the cylinder has good start-stop performance; in addition, in order to realize the installation of the static blades and the whole circle type cylinder body, the static blades are fixed on a holding ring, the holding ring is formed by splicing two semi-circumference rings or more than two arc sections, the holding ring static blades of the upper half circle can be positioned firstly during the assembly, then the holding ring static blades of the lower half circle can be positioned, finally the whole circle type cylinder body is sleeved, the holding ring is convenient for the installation of the whole cylinder, and the installation efficiency and the installation precision are improved.
For improved stability, the holding ring 5 is fixedly connected to the cylinder body 2 by means of a fixing element 7. The fixing piece 7 is used for fixing the cylinder body and the holding ring, and is used for preventing the holding ring from rotating along with the rotor when the rotor rotates, so that the rotation prevention effect is achieved, and the stationary vane is guaranteed to be static. The holding ring 5 is tightly pressed on the inner wall of the cylinder body, namely the distance between the cylinder body and the rotor is matched with the sum of the height of the static blades and the thickness of the holding ring, so that the cylinder body and the holding ring are in gapless fit, therefore, connecting pieces such as bolts and the like are not needed at the middle split surfaces of the two semi-circumferential rings of the holding ring 5, the whole cylinder body is more suitable for the environment with high parameters, and bears very high pressure difference, such as 15MPa-35MPa pressure difference. The contact surface of the cylinder body 2 and the holding ring 5 is a conical surface, the conical surface is inclined along the axial direction of the rotor 1, the diameter of the conical surface is smaller as the conical surface is closer to the steam inlet chamber 9, and the shape is convenient for sleeving.
As a preferred embodiment of the present invention, the steam turbine cylinder of this embodiment has a double-layer cylinder body, and an outer cylinder body 6 is further sleeved outside the cylinder body 2, as shown in fig. 1, 2 and 3, the outer cylinder body 6 is an integral structure with a closed circumferential direction, or the outer cylinder body 6 is formed by splicing two half-circumference cylinder bodies.
As another preferred embodiment of the present invention, an extension cylinder 2a for exhaust cylinder is further provided at the rear of the cylinder body 2, as shown in fig. 1 and 2, a stationary vane 4 is fixed on the inner wall of the extension cylinder 2a, and the extension cylinder 2a can be assembled by splicing two half-circumference cylinder bodies because of low exhaust-side pressure and temperature. The cylinder body 2 is connected to the extension cylinder body 2a by a connecting member 8.
The steam flow direction in the cylinder body 2 in the embodiment is one-way, the steam enters from the steam inlet chamber 9 and then flows out through the space at the blade, and the uniflow cylinder is more suitable for high-parameter environments and can bear high pressure difference, such as 15-35 MPa.
In order to better withstand high pressure differences, the cylinder body 2 is made of a nickel-based high-temperature material, so that the cylinder of the embodiment can be used in a steam turbine with steam inlet parameters of 700 ℃ and above. The outer cylinder body can be made of other materials, so that the cost can be reduced.
The rotor 1 has a circumferentially protruding balancing piston part 1a, which balancing piston 1a may be adjacent to the steam inlet chamber 9, see fig. 1 and 3. The balance piston 1a is used for balancing the axial thrust of the whole rotor when the rotor has pressure difference on two sides of the balance piston. In another embodiment, the balance piston 1a is located on the exhaust side away from the steam inlet chamber 9, as shown in fig. 2; the balance piston of the rotor 1 is positioned at the steam exhaust side, and has the advantages that: the diameter of a steam seal between the steam inlet side rotor and the cylinder body is small, and steam leakage is less.
In summary, the cylinder for the steam turbine of the invention adopts the circumferentially closed full-circle cylinder body, can bear very high pressure difference and temperature, and is suitable for high parameters, such as steam inlet parameters reaching 25MPa to 38 MPa; the cylinder is circumferentially closed, namely a whole-circle structure, has no mid-split steam leakage, and does not need connecting pieces such as mid-split bolts or hot lantern rings, so that the cylinder has good start-stop performance. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A cylinder for a steam turbine comprises a rotor (1), blades and a cylinder body (2), wherein the rotor (1) is arranged in the cylinder body (2) in a penetrating mode, one end of the cylinder body (2) is sealed with the rotor (1), a space for accommodating the blades is formed between the other end of the cylinder body (2) and the rotor (1), the blades comprise static blades (3) and moving blades (4) fixed with the rotor (1), the moving blades (4) and the static blades (3) are arranged alternately, the cylinder body (2) is of a circumferential integral structure, a steam inlet chamber (9) for main steam to enter is formed between the cylinder body (2) and the rotor (1), the blades are arranged behind the steam inlet chamber (9), the static blades (3) are fixed on a holding ring (5) in a circumferential mode, the holding ring (5) is formed by splicing two half rings or more than two circular arc sections, the holding ring (5) is tightly abutted to the inner wall of the cylinder body (2) to enable the cylinder body and the holding ring to be in a gapless, the holding ring (5) is fixedly connected with the cylinder body (2) through a fixing piece (7), and two semi-circumference rings or more than two arc sections are not connected through a connecting piece.
2. The steam turbine of claim 1, wherein: the outside of cylinder body (2) still overlaps and is equipped with outer cylinder body (6), and outer cylinder body (6) are circumference confined integral type structure, and perhaps outer cylinder body (6) are formed by two semi-circumference cylinder body concatenations.
3. The steam turbine of claim 1, wherein: the rear part of the cylinder body (2) is also provided with an extension cylinder body (2a) used as an exhaust cylinder, the inner wall of the extension cylinder body (2a) is fixed with a stationary blade (3), and the extension cylinder body (2a) is formed by splicing two semi-circumference cylinder bodies.
4. A cylinder for a steam turbine according to claim 3, wherein: the cylinder body (2) is connected with the extension cylinder body (2a) through a connecting piece (8).
5. The steam turbine of claim 1, wherein: the steam flow direction in the cylinder body (2) is one-way, and the steam enters from the steam inlet chamber (9) and then flows out through the space at the blade.
6. The steam turbine of claim 1, wherein: the cylinder body (2) is made of a nickel-based high-temperature material.
7. The steam turbine of claim 1, wherein: the rotor (1) has a circumferentially protruding balancing piston (1a), the balancing piston (1a) being adjacent to the steam inlet chamber (9).
8. The steam turbine of claim 1, wherein: the rotor (1) is provided with a balance piston part (1a) protruding in the circumferential direction, and the balance piston (1a) is positioned on the steam exhaust side far away from the steam inlet chamber (9).
9. The steam turbine of claim 1, wherein: the contact surface of the cylinder body (2) and the holding ring (5) is a conical surface, the conical surface inclines along the axial direction of the rotor (1), and the diameter of the conical surface is smaller when the conical surface is closer to the steam inlet chamber (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185407.1A CN108204253B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185407.1A CN108204253B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108204253A CN108204253A (en) | 2018-06-26 |
| CN108204253B true CN108204253B (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611185407.1A Active CN108204253B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
Country Status (1)
| Country | Link |
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| CN (1) | CN108204253B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868889A (en) * | 2018-09-11 | 2018-11-23 | 中国长江动力集团有限公司 | Steam turbine and power generator |
| CN109162772B (en) * | 2018-11-06 | 2024-03-19 | 上海电气电站设备有限公司 | Steam turbine and internal cooling method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202031656U (en) * | 2011-04-22 | 2011-11-09 | 上海哈能环保节能工程有限公司 | Special turbine for saturated steam |
| CN102383879A (en) * | 2011-10-28 | 2012-03-21 | 上海电气电站设备有限公司 | Steam turbine structure |
| CN203097954U (en) * | 2013-01-30 | 2013-07-31 | 成都措普科技有限公司 | Reaction steam turbine |
-
2016
- 2016-12-20 CN CN201611185407.1A patent/CN108204253B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202031656U (en) * | 2011-04-22 | 2011-11-09 | 上海哈能环保节能工程有限公司 | Special turbine for saturated steam |
| CN102383879A (en) * | 2011-10-28 | 2012-03-21 | 上海电气电站设备有限公司 | Steam turbine structure |
| CN203097954U (en) * | 2013-01-30 | 2013-07-31 | 成都措普科技有限公司 | Reaction steam turbine |
Non-Patent Citations (2)
| Title |
|---|
| 内缸;liushul211;《www.docin.com/p-627358538.html》;20130402;第1页 * |
| 超临界600MW等级汽轮机高中压整体内缸研究;陈珍;《热力透平》;20160930;第45卷(第3期);第197页、图1a * |
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| Publication number | Publication date |
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| CN108204253A (en) | 2018-06-26 |
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