CN108204252B - Cylinder for steam turbine - Google Patents
Cylinder for steam turbine Download PDFInfo
- Publication number
- CN108204252B CN108204252B CN201611184996.1A CN201611184996A CN108204252B CN 108204252 B CN108204252 B CN 108204252B CN 201611184996 A CN201611184996 A CN 201611184996A CN 108204252 B CN108204252 B CN 108204252B
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- Prior art keywords
- inner cylinder
- side inner
- steam
- cylinder section
- inlet side
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
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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
- F01D11/005—Sealing means between non relatively rotating elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a cylinder for a steam turbine, which comprises an outer cylinder and an inner cylinder arranged in the outer cylinder, wherein a rotor of the steam turbine penetrates through the inner cylinder, the outer cylinder and the inner cylinder are formed by encircling and splicing two semi-circumference parts, the two semi-circumference parts of the inner cylinder are divided into a steam inlet side inner cylinder section and a steam outlet side inner cylinder section along the axial direction, the steam inlet side inner cylinder section is connected with the steam outlet side inner cylinder section in a sealing manner through a sealing element, the sealing element is an annular closed ring-shaped element, and the two semi-circumference parts of the inner cylinder are integrally sealed. The invention has good sealing performance, is beneficial to improving the efficiency of the cylinder and reducing the manufacturing cost of the cylinder.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a cylinder for a steam turbine.
Background
According to the steam turbine described in "handbook of plant equipment for thermal power plant-second volume-steam turbine, mechanical industry press, 1998", the inner casing of the steam turbine is divided into an integral inner casing and a sectional inner casing. The integral inner cylinder is a common form of the inner cylinder of the steam turbine, but the integral inner cylinder has large size, high cost and large difficulty in manufacturing and transportation. The sectional type inner cylinder is easy to produce and manufacture, as shown in figure 1, the cylinder comprises an outer cylinder 2 and an inner cylinder, a rotor 1 is arranged in the inner cylinder in a penetrating mode, the inner cylinder is of a sectional type structure and is composed of a steam inlet side inner cylinder section 31 and a steam outlet side inner cylinder section 32, all the sections are separated to form steam through chambers, sealing between the chambers is achieved through sealing connection (a dotted line frame in figure 1) of the inner cylinder and the outer cylinder, and due to the fact that large temperature difference exists between the two chambers, axial sealing and split surface sealing in the dotted line frame are poor; meanwhile, in the starting and stopping process, the stress is large, and steam is easy to leak.
Therefore, a cylinder for a steam turbine having excellent sealing performance and high efficiency is required.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a cylinder for a steam turbine, which is used to solve the problems of low cylinder efficiency and high manufacturing cost in the prior art.
In order to achieve the above and other related objects, the present invention provides a steam turbine cylinder, including an outer cylinder and an inner cylinder disposed in the outer cylinder, wherein a rotor of the steam turbine is inserted into the inner cylinder, the outer cylinder and the inner cylinder are formed by two half-circumference portions which are joined together, the two half-circumference portions of the inner cylinder are axially divided into a steam inlet side inner cylinder section and a steam outlet side inner cylinder section, the steam inlet side inner cylinder section and the steam outlet side inner cylinder section are hermetically connected by a sealing member, and the sealing member is an annular closed ring-shaped member which integrally seals the two half-circumference portions of the inner cylinder.
Preferably, the sealing means of the sealing member is to seal the steam inlet side inner cylinder section and the steam outlet side inner cylinder section in a radial direction of the rotor.
Preferably, the side surface of the steam inlet side inner cylinder section connected with the steam outlet side inner cylinder section is provided with a protruding part, the steam outlet side inner cylinder section is provided with a groove for accommodating the protruding part, and the sealing element is positioned between the outer side surface of the protruding part and the inner wall of the groove.
Preferably, the protrusion is provided with a positioning member for positioning the sealing member.
Preferably, the sealing means of the sealing member is to seal the space between the steam inlet side inner cylinder section and the steam outlet side inner cylinder section in the axial direction of the rotor.
Preferably, the steam inlet side inner cylinder section and the steam outlet side inner cylinder section are both provided with axially extending grooves, one side of the sealing element is inserted into the groove of the steam inlet side inner cylinder section, and the other side of the sealing element is inserted into the groove of the steam outlet side inner cylinder section.
Preferably, the steam inlet side inner cylinder section and the steam outlet side inner cylinder section are made of different materials.
As described above, the cylinder for a steam turbine according to the present invention has the following advantageous effects: the inner cylinder is of a sectional structure, the inner cylinder section at the steam inlet side and the inner cylinder section at the steam outlet side are in sealing connection, the inner cylinder is integrally sealed by adopting an annular closed ring-shaped sealing element, and the sealing form utilizes the internal and external pressure difference to form good self sealing; meanwhile, the thin-wall structure sealing element can bear large temperature difference, and can effectively coordinate the deformation between the inner cylinders at two sides and reduce the thermal stress; because the sealing element is formed by splicing two halves, the air leakage of the middle split surface does not exist, so the sealing performance of the invention is good, the efficiency of the cylinder is improved, and the manufacturing cost of the cylinder is reduced.
Drawings
Fig. 1 is a schematic view showing a sectional type inner casing structure in the prior art.
Fig. 2 is a view showing a first embodiment of the cylinder for a steam turbine of the present invention.
Fig. 3 is a view showing a second embodiment of the cylinder for a steam turbine of the present invention.
Fig. 4 is a view showing a third embodiment of the cylinder for a steam turbine of the present invention.
Fig. 5 is a view showing a fourth embodiment of the cylinder for a steam turbine of the present invention.
Description of the element reference numerals
1 rotor
2 outer cylinder
31 steam inlet side inner cylinder section
32 steam outlet side inner cylinder section
4 sealing element
5 positioning piece
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 5. 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. 2 to 5, the present invention provides a steam turbine cylinder, which includes an outer cylinder 2 and an inner cylinder disposed in the outer cylinder 2, wherein a rotor 1 of the steam turbine is inserted into the inner cylinder, the outer cylinder 2 and the inner cylinder are formed by two half-circumference portions which are joined together, the two half-circumference portions of the inner cylinder are axially divided into a steam inlet side inner cylinder section 31 and a steam outlet side inner cylinder section 32, the steam inlet side inner cylinder section 31 and the steam outlet side inner cylinder section 32 are hermetically connected by a sealing element 4, and the sealing element 4 is an annular closed ring-shaped element, so as to integrally seal the two half-circumference portions of the inner cylinder. The invention adopts the ring-shaped sealing element with annular closure to hermetically connect the steam inlet side inner cylinder section 31 and the steam outlet side inner cylinder section 32, and utilizes the pressure difference in the inner cylinders to form good self-sealing; meanwhile, the sealing structure can bear large temperature difference; the sealing element is formed by splicing two halves, namely the sealing element is of a whole-circle structure, so that the split air leakage does not exist, the sealing performance of the cylinder is good, the efficiency of the cylinder is improved, and the manufacturing cost of the cylinder is reduced.
Several arrangements of the above-described seals are described in detail below.
As shown in fig. 2 and 3, the seal 4 seals between the steam inlet side inner casing section 31 and the steam outlet side inner casing section 32 in the radial direction of the rotor 1. Fig. 2 shows a specific structure diagram of a dual-manifold cylinder, in which an inner cylinder of the dual-manifold cylinder is divided into three sections, the middle section is an inner cylinder section 31 on a steam inlet side, the two side sections are inner cylinder sections 32 on a steam outlet side, and a sealing element 4 is radially arranged to radially seal the inner cylinder sections 31 and 32 on the steam inlet side. Fig. 3 shows a specific structure of a uniflow cylinder, and the inner cylinder of the uniflow cylinder is divided into two sections, one section is an inner cylinder section 31 on the steam inlet side, and the other section is an inner cylinder section 32 on the steam outlet side.
For better mounting and fixing of the sealing element, see the partial enlarged part in fig. 2 and 3, the side surface of the steam inlet side inner cylinder section 31 connected with the steam outlet side inner cylinder section 32 is provided with a projection, the steam outlet side inner cylinder section 32 is provided with a groove for accommodating the projection, and the sealing element 4 is positioned between the outer side surface of the projection and the inner wall of the groove. In this embodiment, the protrusion is provided with a positioning member 5 for positioning the sealing member 4, and the positioning member may be fixed to the protrusion by a screw connection or a positioning bolt, as long as the sealing member can be fixed. The embodiment enhances the positioning of the sealing element, thereby improving the sealing property. For ease of arrangement, the seal 4 may be positioned in an upright position between the projection and the inner wall of the recess.
The inner cylinder adopting radial sealing is assembled in the following mode: the steam inlet side inner cylinder section 31 (comprising an upper half-circumference part and a lower half-circumference part) and the rotor 1 are hoisted as a whole, the upper half-circumference part and the lower half-circumference part are temporarily fixed, the sealing element 4 is sleeved in the upper half-circumference part and the lower half-circumference part of the steam inlet side inner cylinder section 31, the sealing element 4 is fixed by using the positioning element 5, and the steam inlet side inner cylinder section, the rotor, the sealing element and the positioning element form a whole; then the lower half circumference part of the steam outlet side inner cylinder section, the integral piece and the upper half circumference part of the steam outlet side inner cylinder section are sequentially installed to finish installation.
As shown in fig. 4 and 5, the seal 4 is sealed between the steam inlet side inner cylinder section 31 and the steam outlet side inner cylinder section 32 in the axial direction of the rotor 1. FIG. 4 is a detailed block diagram of a dual flow cylinder; fig. 5 is a detailed structural view showing a uniflow cylinder. The axial seal in this embodiment is to arrange the seal 4 transversely, see enlarged parts in fig. 4 and 5.
In order to facilitate the installation and positioning of the sealing element, see fig. 4 and the partial enlarged portion of fig. 5, the steam inlet side inner cylinder section 31 and the steam outlet side inner cylinder section 32 are both provided with axially extending grooves, and one side of the sealing element 4 is inserted into the groove of the steam inlet side inner cylinder section 31, and the other side is inserted into the groove of the steam outlet side inner cylinder section 32. The arrangement of the groove facilitates the installation and the positioning of the sealing element and improves the sealing property.
The inner cylinder adopting radial sealing is assembled in the following mode: firstly, mounting the rotor 1 and the upper semi-circumference part and the lower semi-circumference part of the steam inlet side inner cylinder section 31, then mounting the whole circle of sealing element 4, and embedding the sealing element 4 into the groove of the steam inlet side inner cylinder section; the rotor 1 and the steam inlet side inner cylinder section 31 are hoisted as a whole, and are temporarily fixed to form an integral piece; then the lower half circumference part of the steam outlet side inner cylinder section 32, the integral piece and the upper half circumference part of the steam outlet side inner cylinder section are sequentially arranged; then the sealing element is moved, and one side of the sealing element is embedded into the groove of the steam outlet side inner cylinder section, so that the sealing element can simultaneously overlap the inner cylinders on the two sides, the sealing performance is ensured, and the installation of the inner cylinders is completed.
In order to reduce the production cost better, the steam inlet side inner cylinder section 31 and the steam outlet side inner cylinder section 32 are made of different materials. The inner cylinder section 31 on the steam inlet side is made of better materials, such as materials with the grade of 600-625 ℃ or the grade of 700-760 ℃; the steam outlet side inner cylinder section can adopt lower-grade materials. The seal 4 is a thin annular member.
In summary, the inner cylinder of the cylinder for the steam turbine has a sectional structure, the steam inlet side inner cylinder section and the steam outlet side inner cylinder section are in sealing connection, the inner cylinder is integrally sealed by adopting an annular closed ring-shaped sealing element, and the sealing form utilizes the internal and external pressure difference to form good self-sealing; meanwhile, the ring-shaped sealing element can bear large temperature difference, and can effectively coordinate the deformation between the inner cylinders at two sides, thereby reducing the thermal stress; because the sealing element is formed by splicing two halves, the air leakage of the middle split surface does not exist, so the sealing performance of the invention is good, the efficiency of the cylinder is improved, and the manufacturing cost of the cylinder is reduced. 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 (7)
1. The utility model provides a cylinder that steam turbine was used, includes outer jar (2) and arranges the inner cylinder in outer jar (2) in, and the rotor (1) of steam turbine wears to establish in the inner cylinder, outer jar (2) and inner cylinder are embraced the concatenation by two semicircle parts and are formed, two semicircle parts of inner cylinder all divide into steam inlet side inner cylinder section (31) and play steam side inner cylinder section (32) along the axial, its characterized in that, steam inlet side inner cylinder section (31) with play steam side inner cylinder section (32) are sealed continuous through sealing member (4), just sealing member (4) are the closed circle spare of annular, will two semicircle parts integral seal of inner cylinder.
2. The steam turbine of claim 1, wherein: the sealing manner of the sealing element (4) is to seal the space between the steam inlet side inner cylinder section (31) and the steam outlet side inner cylinder section (32) along the radial direction of the rotor (1).
3. The steam turbine of claim 2, wherein: the side surface of the steam inlet side inner cylinder section (31) connected with the steam outlet side inner cylinder section (32) is provided with a protruding part, the steam outlet side inner cylinder section (32) is provided with a groove for accommodating the protruding part, and the sealing element (4) is positioned between the outer side surface of the protruding part and the inner wall of the groove.
4. A cylinder for a steam turbine according to claim 3, wherein: the protruding part is provided with a positioning piece (5) for positioning the sealing piece (4).
5. The steam turbine of claim 1, wherein: the sealing manner of the sealing element (4) is to seal the space between the steam inlet side inner cylinder section (31) and the steam outlet side inner cylinder section (32) along the axial direction of the rotor (1).
6. The steam turbine of claim 5, wherein: the steam inlet side inner cylinder section (31) and the steam outlet side inner cylinder section (32) are both provided with axially extending grooves, one side of the sealing element (4) is inserted into the groove of the steam inlet side inner cylinder section (31), and the other side of the sealing element is inserted into the groove of the steam outlet side inner cylinder section (32).
7. The steam turbine of claim 1, wherein: the steam inlet side inner cylinder section (31) and the steam outlet side inner cylinder section (32) are made of different materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611184996.1A CN108204252B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611184996.1A CN108204252B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108204252A CN108204252A (en) | 2018-06-26 |
| CN108204252B true CN108204252B (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611184996.1A Active CN108204252B (en) | 2016-12-20 | 2016-12-20 | Cylinder for steam turbine |
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| Country | Link |
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| CN (1) | CN108204252B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412546B (en) * | 2020-11-23 | 2022-01-11 | 东方电气集团东方汽轮机有限公司 | Nozzle chamber of industrial steam turbine without median plane |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605717A (en) * | 2003-10-10 | 2005-04-13 | 上海发电设备成套设计研究所 | Super-supercritical air cooling steam turbine |
| CN102383879A (en) * | 2011-10-28 | 2012-03-21 | 上海电气电站设备有限公司 | Steam turbine structure |
| CN204386675U (en) * | 2014-11-26 | 2015-06-10 | 嘉善县汾湖铸钢厂 | A kind of High Pressure Inner Cylinder of Steam Turbine |
| CN105134314A (en) * | 2015-10-19 | 2015-12-09 | 东方电气集团东方汽轮机有限公司 | Turboset high-pressure part structure with cylindrical inner shell |
-
2016
- 2016-12-20 CN CN201611184996.1A patent/CN108204252B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605717A (en) * | 2003-10-10 | 2005-04-13 | 上海发电设备成套设计研究所 | Super-supercritical air cooling steam turbine |
| CN102383879A (en) * | 2011-10-28 | 2012-03-21 | 上海电气电站设备有限公司 | Steam turbine structure |
| CN204386675U (en) * | 2014-11-26 | 2015-06-10 | 嘉善县汾湖铸钢厂 | A kind of High Pressure Inner Cylinder of Steam Turbine |
| CN105134314A (en) * | 2015-10-19 | 2015-12-09 | 东方电气集团东方汽轮机有限公司 | Turboset high-pressure part structure with cylindrical inner shell |
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| Publication number | Publication date |
|---|---|
| CN108204252A (en) | 2018-06-26 |
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