CN111042876B - Built-in interlayer heating device for steam turbine cylinder - Google Patents
Built-in interlayer heating device for steam turbine cylinder Download PDFInfo
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- CN111042876B CN111042876B CN201911327543.3A CN201911327543A CN111042876B CN 111042876 B CN111042876 B CN 111042876B CN 201911327543 A CN201911327543 A CN 201911327543A CN 111042876 B CN111042876 B CN 111042876B
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- interlayer
- valve disc
- air passage
- air
- steam turbine
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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
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
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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 built-in interlayer heating device for a steam turbine cylinder, which belongs to the field of steam turbine structures and is used for communicating an interlayer between an inner cylinder and an outer cylinder with the inner cylinder, and the interlayer heating device comprises a main body and a valve disc; an air passage used for communicating the interlayer and the inner cylinder is arranged in the main body, and the air passage is provided with an air inlet which enters the air passage from the inner cylinder and an air outlet which extends from the air passage to the interlayer; a valve disc is arranged in the air passage; the valve disc comprises a force bearing surface corresponding to the air inlet and a rebound surface opposite to the force bearing surface; the valve disc has a first position close to the air inlet opening the air passage and a second position far away from the air inlet opening the air passage; the rebound surface is provided with an elastic member which always has a tendency to move the valve disc towards the first position. The ventilation and heating of the interlayer by the inner cylinder can be realized, the expansion difference between the interlayer and the inner cylinder is reduced, and the abrasion of the movable part sleeve and the static part sleeve caused by the expansion difference is avoided. The threshold value controlled by the pressure spring can control the steam output from the inner cylinder to the interlayer, so that continuous air leakage is prevented.
Description
Technical Field
The invention relates to the field of steam turbine structures, in particular to a built-in interlayer heating device for a steam turbine cylinder.
Background
In the double-layer cylinder structure of the steam turbine, an interlayer cavity is arranged between an inner cylinder and an outer cylinder. In the starting process of the steam turbine, interlayer steam flows slowly, heat exchange is weak, the temperature of the outer cylinder is slowly increased, if heating steam is not introduced into the interlayer to enhance heat exchange, expansion difference of the steam turbine is gradually increased, actuating and static part sleeve collision and abrasion are conducted, and safe operation of the steam turbine is threatened. Therefore, the cylinder interlayer needs to be heated in the starting process of the steam turbine, and an interlayer heating system commonly used at present needs to be provided with an interlayer heating header, an external pipeline, a control system and the like, so that the structure is complex, and the cost is high.
Disclosure of Invention
The invention provides a built-in interlayer heating device for a steam turbine cylinder, and aims to solve the problems of the built-in interlayer heating device for the steam turbine cylinder in the prior art.
The invention is realized by the following steps:
a built-in interlayer heating device of a steam turbine cylinder is used for communicating an interlayer between an inner cylinder and an outer cylinder with the inner cylinder and comprises a main body and a valve disc;
an air passage used for communicating the interlayer and the inner cylinder is arranged in the main body, and the air passage is provided with an air inlet which enters the air passage from the inner cylinder and an air outlet which enters the interlayer from the air passage;
the valve disc is arranged in the air passage;
the valve disc comprises a force bearing surface corresponding to the air inlet and a rebound surface opposite to the force bearing surface;
the valve disc has a first position that opens the air passage proximate the air inlet and a second position that closes the air passage distal from the air inlet;
the rebound surface is provided with an elastic member that always has a tendency to move the valve disc to the first position.
In one embodiment of the invention, the body comprises a housing and a top cover;
the air flue is arranged in the shell, a mounting opening is formed in one end of the shell, and the top cover is detachably arranged at the mounting opening.
In one embodiment of the invention, the housing is threadedly connected to the top cover.
In an embodiment of the invention, a convex edge is arranged on the circumferential direction of the valve disc, an inner annular ring corresponding to the convex edge is arranged on the inner wall of the air passage, and when the valve disc is in the second position, the convex edge is in sealing contact with the inner annular ring to close the air passage.
In one embodiment of the invention, a guide seat is further arranged between the top cover and the valve disc;
the valve disc is provided with the orientation the blind hole of top cap, the guide holder sets up in the blind hole, the guide holder with form between the inner wall of blind hole the direction annular of elastic component direction.
In one embodiment of the invention, the body further comprises a base;
the base is detachably connected with the shell, and the air inlet is formed in the base;
and one end of the base, which is far away from the shell, is provided with a connecting thread for connecting the inner cylinder.
In one embodiment of the invention, the air passage comprises an air inlet section and an air outlet section which are vertically arranged;
the inner convex ring is arranged in the air inlet section, and the convex edge is arranged at the end of the valve disc facing the air inlet.
In one embodiment of the present invention, the air outlet includes branch ports respectively provided at both sides of the main body.
The invention has the beneficial effects that: the steam turbine cylinder built-in interlayer heating device provided by the invention can be applied to any double-layer cylinder steam turbine which needs to heat an interlayer and has steam pressure difference inside and outside the inner cylinder. The built-in interlayer heating device for the steam turbine cylinder can realize ventilation heating of the interlayer by the inner cylinder, reduce the expansion difference between the interlayer and the inner cylinder and avoid the abrasion of the movable part sleeve and the static part sleeve caused by the expansion difference. The threshold value controlled by the pressure spring can control the steam output from the inner cylinder to the interlayer, so that continuous air leakage is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic installation diagram of a built-in interlayer heating device of a steam turbine cylinder provided by an embodiment of the invention;
fig. 2 is a sectional view of a steam turbine cylinder built-in interlayer heating device according to an embodiment of the present invention.
Icon: 001-steam turbine cylinder built-in interlayer heating device; 100-a body; 200-a valve disc; 110-a top cover; 130-a housing; 150-a base; 101-the airway; 103-air inlet; 105-a branch port; 201-stress surface; 203-rebound surface; 210-a pressure spring; 230-blind hole; 250-a guide seat; 270-convex edge; 170-inner convex ring; 002-inner cylinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Examples
The embodiment provides a steam turbine cylinder built-in interlayer heating device 001, please refer to fig. 1 and fig. 2, the steam turbine cylinder built-in interlayer heating device 001 is used for communicating an interlayer between an inner cylinder 002 and an outer cylinder with the inner cylinder 002, and comprises a main body 100 and a valve disc;
the main body 100 comprises a top cover 110, a shell 130 and a base 150 which are detachably connected, the shell 130 is internally used for arranging an air passage 101 and installing a valve disc 200 for opening and closing the air passage 101, the top cover 110 is used for opening a window to facilitate the assembly of an internal structure, and one end of the base 150, which is far away from the shell 130, is provided with a connecting thread for connecting the main body 100 and the inner cylinder 002. Specifically, an air channel 101 for communicating the interlayer with the inner cylinder 002 is arranged in the main body 100, wherein an axially arranged through hole in the base 150 forms an air inlet 103 for introducing air from the inner cylinder 002 into the air channel 101, two sides of the housing 130 are respectively provided with a branch port 105 which is radially extended, and the two branch ports 105 are combined to form an air outlet for leading the air from the air channel 101 to the interlayer.
Valve disc 200 is disposed within airway 101 to control the opening and closing of airway 101. Specifically, valve disc 200 is slidably connected to the inner wall of air passage 101 in air passage 101, one surface of valve disc 200 faces air inlet 103 to form a force-bearing surface 201, and air entering through air inlet 103 impacts force-bearing surface 201 to enable valve disc 200 to be displaced in air passage 101.
On the other hand, valve disc 200 further has a rebound surface 203 opposite to force-receiving surface 201, and an elastic member made of a compression spring 210 is disposed on rebound surface 203, and compression spring 210 provides an elastic force to balance with the air pressure of force-receiving surface 201. When the spring force is greater than the gas pressure of force-bearing surface 201, pressure spring 210 urges valve disc 200 toward a first position near gas inlet 103, and when the spring force is less than the gas pressure of force-bearing surface 201, the gas urges valve disc 200 toward a second position away from gas inlet 103.
Controlling the communication of gas by displacement of a first position and a second position, wherein when valve disc 200 is in the first position, gas passage 101 is open and gas can enter from gas inlet 103 and exit from the gas outlet via gas passage 101; when valve disc 200 is in the second position, gas passage 101 is closed and gas cannot pass from gas inlet 103 to gas outlet via gas passage 101.
In this embodiment, the top cover 110 is connected to the housing 130 by a screw, a blind hole 230 is further disposed on a surface of the valve disc 200 facing the top cover 110, a column of the guide seat 250 is disposed in the blind hole 230, and an end of the guide seat 250 away from the valve disc 200 is a seat body abutted to the top cover 110. The compression spring 210 is sleeved on the cylinder of the guide seat 250, one end of the compression spring 210 acts on the seat body of the guide seat 250, the other end acts on the bottom of the blind hole 230, and a guide ring groove for guiding the elastic element is formed between the guide seat 250 and the inner wall of the blind hole 230.
In this embodiment, the opening and closing of the air duct 101 are realized by the cooperation of the convex edge 270 of the valve disc 200 and the inner collar 170 on the inner wall of the air duct 101. Specifically, a protruding edge 270 is circumferentially arranged at one end of the valve disc 200 close to the air inlet 103, an inner annular ring 170 corresponding to the protruding edge 270 is arranged on the inner wall of the air passage 101, and when the valve disc 200 is at the second position, the protruding edge 270 is in sealing contact with the inner annular ring 170 to close the air passage 101. While valve disc 200 is in a non-second position, i.e., at or near the first position, sealing contact between rim 270 and inner collar 170 is relieved, and air passage 101 is opened.
When the steam turbine is used, in a free state, the valve disc is separated from the shell 130 due to the elastic force of the pressure spring 210, the structure is in an open state, and after the steam turbine starts to enter steam, high-temperature steam can flow to the interlayer through the structure to heat the interlayer.
In the starting process of the steam turbine, when the steam pressure in front of the valve disc exceeds a design threshold value, the valve disc gradually compresses the pressure spring 210 along with the increase of the pressure difference until the pressure spring is closed, and the steam delivery to the interlayer is stopped.
The steam turbine cylinder built-in interlayer heating device 001 provided by the invention can be applied to any double-layer cylinder steam turbine which needs to heat an interlayer and has steam pressure difference between the inside and the outside of the inner cylinder 002. The interlayer heating device 001 arranged in the steam turbine cylinder can realize the ventilation heating of the interlayer by the inner cylinder 002, reduce the expansion difference between the interlayer and the inner cylinder 002 and avoid the abrasion of the movable part sleeve and the static part sleeve caused by the expansion difference. The threshold value controlled by the pressure spring 210 can control the steam output from the inner cylinder 002 to the interlayer, thereby preventing continuous air leakage.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A built-in interlayer heating device of a steam turbine cylinder is used for communicating an interlayer between an inner cylinder and an outer cylinder with the inner cylinder and is characterized by comprising a main body and a valve disc;
an air passage used for communicating the interlayer and the inner cylinder is arranged in the main body, and the air passage is provided with an air inlet which enters the air passage from the inner cylinder and an air outlet which enters the interlayer from the air passage;
the valve disc is arranged in the air passage;
the valve disc comprises a force bearing surface corresponding to the air inlet and a rebound surface opposite to the force bearing surface;
the valve disc has a first position that opens the air passage proximate the air inlet and a second position that closes the air passage distal from the air inlet;
the rebound surface is provided with an elastic member that always has a tendency to move the valve disc to the first position.
2. The sandwich heating arrangement for a steam turbine cylinder according to claim 1 wherein the body comprises a housing and a top cover;
the air flue is arranged in the shell, a mounting opening is formed in one end of the shell, and the top cover is detachably arranged at the mounting opening.
3. The sandwich heating system for a steam turbine cylinder according to claim 2, wherein the housing is threadably connected to the top cover.
4. The steam turbine cylinder built-in interlayer heating device as claimed in claim 1, wherein a convex edge is arranged on the circumferential direction of the valve disc, an inner convex ring corresponding to the convex edge is arranged on the inner wall of the air passage, and when the valve disc is in the second position, the convex edge is in sealing contact with the inner convex ring to close the air passage.
5. The steam turbine cylinder built-in interlayer heating device as claimed in claim 2, wherein a guide seat is further arranged between the top cover and the valve disc;
the valve disc is provided with the orientation the blind hole of top cap, the guide holder sets up in the blind hole, the guide holder with form between the inner wall of blind hole the direction annular of elastic component direction.
6. The turbine cylinder built-in sandwich heating device according to claim 2, wherein the body further comprises a base;
the base is detachably connected with the shell, and the air inlet is formed in the base;
and one end of the base, which is far away from the shell, is provided with a connecting thread for connecting the inner cylinder.
7. The built-in interlayer heating device for the steam turbine cylinder according to claim 4, wherein the air passage comprises an air inlet section and an air outlet section which are vertically arranged;
the inner convex ring is arranged in the air inlet section, and the convex edge is arranged at the end of the valve disc facing the air inlet.
8. The sandwich heating system for a turbine cylinder according to claim 7 wherein said air outlet comprises a plurality of ports respectively disposed on opposite sides of said body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327543.3A CN111042876B (en) | 2019-12-20 | 2019-12-20 | Built-in interlayer heating device for steam turbine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327543.3A CN111042876B (en) | 2019-12-20 | 2019-12-20 | Built-in interlayer heating device for steam turbine cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111042876A CN111042876A (en) | 2020-04-21 |
| CN111042876B true CN111042876B (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911327543.3A Active CN111042876B (en) | 2019-12-20 | 2019-12-20 | Built-in interlayer heating device for steam turbine cylinder |
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Family Cites Families (17)
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| GB214664A (en) * | 1923-04-20 | 1924-08-21 | Erste Bruenner Maschinen Fab | Improvements in and relating to steam or gas turbines |
| GB768069A (en) * | 1954-03-24 | 1957-02-13 | Westinghouse Electric Int Co | Improvements in or relating to steam turbines |
| JPH07111125B2 (en) * | 1989-03-06 | 1995-11-29 | 株式会社日立製作所 | Steam control valve |
| JP3620167B2 (en) * | 1996-07-23 | 2005-02-16 | 富士電機システムズ株式会社 | Reheat axial flow steam turbine |
| JP2000328904A (en) * | 1999-05-18 | 2000-11-28 | Mitsubishi Heavy Ind Ltd | Steam turbine wheel chamber |
| US20060162338A1 (en) * | 2005-01-21 | 2006-07-27 | Pratt & Whitney Canada Corp. | Evacuation of hot gases accumulated in an inactive gas turbine engine |
| EP1895095A1 (en) * | 2006-09-04 | 2008-03-05 | Siemens Aktiengesellschaft | Turbine engine and method of operating the same |
| DE102008005088B3 (en) * | 2008-01-18 | 2009-07-30 | A. Kayser Automotive Systems Gmbh | Valve with a resiliently movable or elastically and / or flexibly deformable sealing element |
| JP5390117B2 (en) * | 2008-04-08 | 2014-01-15 | 株式会社東芝 | Steam valve device and steam turbine control method using the same |
| JP2011169383A (en) * | 2010-02-17 | 2011-09-01 | Toshiba Corp | Steam valve device and steam turbine power generation apparatus |
| CN102518488A (en) * | 2011-12-09 | 2012-06-27 | 东方电气集团东方汽轮机有限公司 | Ultrahigh pressure cylinder |
| JP5822964B2 (en) * | 2014-02-25 | 2015-11-25 | 三菱日立パワーシステムズ株式会社 | Steam valve and steam turbine |
| CN103953401B (en) * | 2014-04-30 | 2015-04-29 | 国投钦州发电有限公司 | High-and-medium pressure cylinder of steam turbine for thermal power plant |
| CN106014504B (en) * | 2016-07-05 | 2017-09-12 | 西安西热节能技术有限公司 | A kind of cylinder interlayer structure |
| JP6907086B2 (en) * | 2017-09-28 | 2021-07-21 | 三菱重工コンプレッサ株式会社 | Check valve and steam turbine |
| CN207847710U (en) * | 2017-12-29 | 2018-09-11 | 深圳妈湾电力有限公司 | A kind of Steam Turbine Through IP Admission interlayer cooling steam system |
| CN108825312B (en) * | 2018-06-29 | 2020-03-31 | 东方电气集团东方汽轮机有限公司 | High-pressure main steam regulating valve group of steam turbine |
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