CN109707465B - Adjustable device and method for steam extraction of steam turbine - Google Patents
Adjustable device and method for steam extraction of steam turbine Download PDFInfo
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- CN109707465B CN109707465B CN201811609143.7A CN201811609143A CN109707465B CN 109707465 B CN109707465 B CN 109707465B CN 201811609143 A CN201811609143 A CN 201811609143A CN 109707465 B CN109707465 B CN 109707465B
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Abstract
The invention discloses a steam turbine device, in particular to a device and a method for adjusting steam extraction of a steam turbine, belonging to the technical field of steam turbine devices; the device comprises a cylinder arranged on the outer side of the steam turbine, wherein the cylinder comprises an outer cylinder, an inner cylinder and a steam exhaust cylinder, the outer cylinder is also provided with a steam extraction pipe, and an adjustable steam extraction device for adjusting steam pressure is arranged between the outer cylinder and the inner cylinder; the invention solves the problem that the arrangement of the built-in steam extraction adjusting device of the steam turbine occupies the axial space at present, and can effectively utilize the interlayer space of the inner cylinder and the outer cylinder of the steam turbine by arranging the adjustable steam extraction device between the double-layer cylinder structures and combining the structural design of the adjustable steam extraction device, thereby not occupying the axial space of the unit, reducing the bearing span of the unit or reducing the number of rotors, reducing the length of a shaft system of the unit, having compact axial structure and reducing the cost of the unit.
Description
Technical Field
The invention relates to a steam turbine device, in particular to a device and a method for adjusting steam extraction of a steam turbine, and belongs to the technical field of steam turbine devices.
Background
The existing built-in steam extraction regulating device of the steam turbine is provided with structures such as a cylinder valve, a rotary partition plate and the like, and the structures are arranged on a steam flow axial channel in a cylinder and need to occupy the axial space of a unit. When the bearing span is tense, the stability of the shafting of the unit is reduced or the number of rotors and supports of the unit is increased to meet the stability requirement of the shafting due to the increase of the bearing span.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the device and the method for adjusting the steam extraction of the steam turbine are provided, the axial space of the unit is not required to be occupied, the bearing span of the unit is reduced, or the number of rotors is reduced, the length of a shaft system of the unit is reduced, the axial structure is compact, and the unit cost is reduced.
The technical scheme adopted by the invention is as follows:
the utility model provides a be applied to adjustable device of steam turbine extraction, is including installing in the cylinder in the steam turbine outside, and this cylinder includes outer jar, inner casing and exhaust casing, still is provided with the extraction pipe on this outer jar, is provided with the adjustable extraction device that is used for adjusting vapour pressure between this outer jar and the inner casing, and the inner casing is provided with the cylinder steam inlet.
Furthermore, the adjustable steam extraction device to the steam exhaust cylinder is also provided with a clapboard sleeve/a holding ring which is matched and assembled with the outer cylinder and a plurality of clapboards.
Furthermore, a gap bridge steam seal is arranged in the middle of the cylinder, and the cylinder is divided into a high-pressure section and a low-pressure section by the gap bridge steam seal.
Furthermore, the adjustable steam extraction device comprises a support ring matched and assembled with the outer cylinder and a cover cap matched with the support ring, wherein a first window is arranged at the same position of the support ring corresponding to the cover cap, a groove is arranged at one side of the cover cap corresponding to the support ring, a rotating ring is arranged in the groove, the cover cap, the rotating ring and the support ring are assembled into a whole, a second window corresponding to the first window is arranged on the rotating ring, and flow control is realized through rotation of the rotating ring.
Furthermore, the rotating ring is also connected with a link mechanism for driving the rotating ring to rotate, and the link mechanism is driven by an actuating mechanism.
Further, this adjustable vapor extraction device is adjusting valve formula vapor extraction device, include the valve body that matches the assembly with the outer jar, be provided with a plurality of disk seats on this valve body, the valve opening has been seted up to this disk seat, and this valve opening runs through the valve body, still is provided with the valve disc on this disk seat and realizes reciprocating through the valve rod with this valve disc of control valve opening flow, and this valve rod passes through actuating mechanism and realizes reciprocating.
A method for adjusting steam turbine cylinder is provided, wherein an adjustable steam extraction device is arranged at the interlayer position with double-layer cylinder bodies, the adjustable steam extraction device is assembled on an outer cylinder, the steam extraction pressure from the steam inlet to the high-pressure cavity of the cylinder formed by the adjustable steam extraction device, the outer cylinder and an inner cylinder is a high-pressure section, and the steam pressure end behind the adjustable steam extraction device to the exhaust pressure of an exhaust cylinder is a low-pressure section;
the adjustable steam extraction device adopts a staggered valve structure, a plurality of pairs of first windows are arranged on the support ring and the cover cap which are fixedly assembled, a corresponding number of second windows are arranged on the rotating ring, and the staggered condition of the first windows and the second windows is adjusted by controlling the rotating ring to rotate so as to control the steam extraction amount.
Further, the low pressure section is a single cylinder structure, and the single cylinder structure is an outer cylinder, where the low pressure section is located, equipped with a spacer sleeve/retaining ring, and a plurality of spacers.
Further, if the steam turbine is an impulse steam turbine, the outer casing is provided with a partition plate sleeve; if the turbine is a reaction turbine, the outer casing is fitted with a retaining ring.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the device and the method for adjusting the steam extraction of the steam turbine solve the problem that the arrangement of the built-in steam extraction adjusting device of the steam turbine occupies the axial space at present, and can effectively utilize the interlayer space of the inner cylinder and the outer cylinder of the steam turbine by arranging the adjustable steam extraction device between the double-layer cylinder structures and combining the structural design of the adjustable steam extraction device, so that the axial space of a unit is not occupied, the bearing span of the unit is reduced, or the number of rotors is reduced, the length of a unit shafting is reduced, the axial structure is compact, and the unit cost is reduced.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic cross-sectional view of a malposition valve configuration of the present invention;
FIG. 3 is a second schematic structural diagram of the present invention;
figure 4 is a schematic cross-sectional view of a modulating valve extraction device of the present invention.
The labels in the figure are: 1-adjustable steam extraction device, 2-steam extraction pipe, 3-outer cylinder, 4-inner cylinder, 5-gap bridge steam seal, 6-clapboard sleeve (retaining ring), 7-rotor and moving blade, 8-clapboard, 9-exhaust cylinder, 10, rear steam seal, 11-front steam seal, 12-cover cap, 13 a-first window, 13 b-second window, 14-rotating ring, 15-link mechanism, 16-support ring, 17-steam seal ring, 18-steam inlet, 19-groove, 20-adjustable valve type steam extraction device, 21-valve body, 22-valve seat, 23-valve disc, 24-valve rod and 25-sealing element.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
An adjustable device for steam extraction of a steam turbine is shown in fig. 1 and 3, and comprises a cylinder arranged on the outer side of the steam turbine, wherein the cylinder comprises an outer cylinder 3, an inner cylinder 4 and a steam exhaust cylinder 9, a steam extraction pipe 2 is further arranged on the outer cylinder 3, an adjustable steam extraction device 1 for adjusting steam pressure is arranged between the outer cylinder 3 and the inner cylinder 4, and a cylinder steam inlet 18 is arranged on the inner cylinder 4.
In this embodiment, with adjustable extraction device assembly between the intermediate layer of interior outer cylinder to the abundant utilization of realization internal and external jar intermediate layer space, and, avoid adjustable extraction device to occupy the problem of unit space, simultaneously, as required, adjustable extraction device can adjust the vapour pressure problem of high-pressure section. Through the design, after steam enters the steam turbine, the steam passes through the partition plate and the moving blade in the high-pressure cylinder and is turned back to the low-pressure section of the cylinder through the adjustable steam extraction device to flow through, and steam flow continues to expand and do work in the low-pressure section.
As a more specific design, a more optimized design is made for the diaphragm mechanism, the adjustable steam extraction to the exhaust cylinder is further provided with a diaphragm sleeve/retaining ring 6 fitted with the outer cylinder and a plurality of diaphragms 8. The partial cylinder is of a single outer cylinder structure, a partition plate mechanism is arranged at the same time, and a rotor and a moving blade 7 are arranged inside the outer cylinder
In order to ensure the steam seal effect, as a more specific design, a gap bridge steam seal is arranged in the middle of the cylinder, and the cylinder is divided into a high-pressure section and a low-pressure section by the gap bridge steam seal 5. Specifically, the inner cylinder is matched with the outer cylinder.
Specifically, the adjustable steam extraction device is designed, in one specific embodiment, the adjustable steam extraction device includes a support ring 16 which is matched and assembled with the outer cylinder, and a cover 12 which is matched and assembled with the support ring, a first window 13a is arranged at the same position of the support ring corresponding to the cover, a groove 19 is arranged at one side of the cover 12 corresponding to the support ring, a rotating ring 14 is arranged in the groove, the cover, the rotating ring and the support ring are assembled into a whole, a second window 13b corresponding to the first window is arranged on the rotating ring 14, and flow control is realized through rotation of the rotating ring. More specifically, the cover 12 and the support ring may be fixedly connected by bolts.
More specifically, the rotating ring 14 is further connected with a link mechanism 15 for driving the rotating ring to rotate, the link mechanism is driven by an actuating mechanism, and of course, in order to ensure the rotating effect of the rotating ring, the side wall of the cover is provided with a sliding groove for the rotation of the link. In a specific design, the link mechanism 15 comprises 1 link, and two ends of the link are respectively hinged with the rotating ring and the actuating mechanism (similar to a crank-slider mechanism). The actuator can then be, for example, an electric/hydraulic telescopic cylinder. More specifically, the link mechanism 15 includes 2 hinged links, one of which is hinged to the rotating ring, and the other of which penetrates through the outer cylinder and is fixedly connected to the actuator. And a sealing element is arranged between the connecting rod and the outer cylinder. Specifically, a steam seal ring 17 is arranged between the support ring and the rotor and the moving blade.
Based on the mode of above-mentioned design, can also adopt other designs, in another embodiment, this adjustable extraction device is adjusting valve formula extraction device 20, include the valve body 21 with the outer jar matching assembly, be provided with a plurality of disk seats 22 on this valve body, the valve opening has been seted up to this disk seat, this valve opening runs through the valve body, still is provided with valve disc 23 on this disk seat with control valve opening flow, this valve disc 23 realizes reciprocating through valve rod 25, this valve rod passes through actuating mechanism and realizes reciprocating. Specifically, the valve stem extends through the outer cylinder. A sealing element 25 is arranged between the valve stem and the outer cylinder. A steam seal ring 17 is arranged between the valve body and the inner cylinder 4.
More specifically, the front end of the cylinder is provided with a front gland seal 10, and the rear end is provided with a rear gland seal 11.
Example 2
A method for adjusting steam turbine cylinder is provided, wherein an adjustable steam extraction device is arranged at the interlayer position with double-layer cylinder bodies, the adjustable steam extraction device is assembled on an outer cylinder, the steam extraction pressure from the steam inlet to the high-pressure cavity of the cylinder formed by the adjustable steam extraction device, the outer cylinder and an inner cylinder is a high-pressure section, and the steam pressure end behind the adjustable steam extraction device to the exhaust pressure of an exhaust cylinder is a low-pressure section;
the adjustable steam extraction device adopts a staggered valve structure, a plurality of pairs of first windows are arranged on the support ring and the cover cap which are fixedly assembled, a corresponding number of second windows are arranged on the rotating ring, and the staggered condition of the first windows and the second windows is adjusted by controlling the rotating ring to rotate so as to control the steam extraction amount.
As a more specific design, the low pressure section is a single cylinder structure, and the single cylinder structure is an outer cylinder fitted with a spacer sleeve/retaining ring, and a plurality of spacers.
In a more specific configuration, if the turbine is an impulse turbine, the outer casing is fitted with a spacer sleeve; if the turbine is a reaction turbine, the outer casing is fitted with a retaining ring.
More specifically, the high pressure section is separated from the low pressure section by a bridge seal.
In conclusion, the device and the method for adjusting steam extraction of the steam turbine solve the problem that the arrangement of the built-in steam extraction adjusting device of the steam turbine occupies the axial space at present, the adjustable steam extraction device is arranged between the double-layer cylinder structures, and the structural design of the adjustable steam extraction device is combined, so that the interlayer space of the inner cylinder and the outer cylinder of the steam turbine can be effectively utilized, the axial space of a unit is not occupied, the bearing span of the unit is reduced, or the number of rotors is reduced, the length of a unit shafting is reduced, the axial structure is compact, and the unit cost is reduced.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. The utility model provides a be applied to adjustable device of steam turbine extraction which characterized in that: the steam turbine comprises a cylinder arranged on the outer side of a steam turbine, wherein the cylinder comprises an outer cylinder (3), an inner cylinder (4) and a steam exhaust cylinder (9), the outer cylinder (3) is also provided with a steam extraction pipe (2), an adjustable steam extraction device (1) for adjusting steam pressure is arranged between the outer cylinder (3) and the inner cylinder (4), and the inner cylinder (4) is provided with a cylinder steam inlet (18);
the adjustable steam extraction device comprises a support ring (16) assembled with an outer cylinder in a matching mode, and a cover cap (12) matched with the support ring, wherein a first window (13 a) is arranged at the same position of the support ring corresponding to the cover cap, a groove (19) is formed in one side, corresponding to the support ring, of the cover cap (12), a rotating ring (14) is arranged in the groove, the cover cap, the rotating ring and the support ring are assembled into a whole, a second window (13 b) corresponding to the first window is arranged on the rotating ring (14), and flow control is achieved through rotation of the rotating ring.
2. The adjustable steam extraction apparatus for a steam turbine as claimed in claim 1, wherein: the adjustable steam extraction device to the steam exhaust cylinder is also provided with a clapboard sleeve/holding ring (6) matched with the outer cylinder and a plurality of clapboards (8).
3. The adjustable steam extraction apparatus for a steam turbine as claimed in claim 1, wherein: the middle part of the cylinder is provided with a gap bridge steam seal which divides a steam flow channel in the cylinder into a high-pressure section and a low-pressure section.
4. The adjustable steam extraction apparatus for a steam turbine as claimed in claim 1, wherein: the rotating ring (14) is also connected with a link mechanism (15) for driving the rotating ring to rotate, and the link mechanism is driven by an actuating mechanism.
5. An adjustable method applied to a steam turbine cylinder is characterized in that: arranging an adjustable steam extraction device at the interlayer position with the double-layer cylinder body, wherein the adjustable steam extraction device is assembled on the outer cylinder, the steam extraction pressure from the steam inlet to the high-pressure cavity of the cylinder formed by the adjustable steam extraction device, the outer cylinder and the inner cylinder is a high-pressure section, and the steam pressure end behind the adjustable steam extraction device to the steam exhaust pressure of the exhaust cylinder is a low-pressure section;
the adjustable steam extraction device adopts a staggered valve structure, a plurality of pairs of first windows are arranged on the support ring and the cover cap which are fixedly assembled, a corresponding number of second windows are arranged on the rotating ring, and the staggered condition of the first windows and the second windows is adjusted by controlling the rotating ring to rotate so as to control the steam extraction amount.
6. The method of claim 5, applied to a steam turbine for adjustable steam extraction, wherein: the low-pressure section is of single-cylinder construction and the single-cylinder construction is an outer cylinder, which is fitted with a diaphragm sleeve/retaining ring, and a plurality of diaphragms.
7. The method of claim 6, applied to a steam turbine for adjustable steam extraction, wherein: if the steam turbine is an impulse type steam turbine, the outer cylinder is provided with a clapboard sleeve; if the turbine is a reaction turbine, the outer casing is fitted with a retaining ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018114535984 | 2018-11-30 | ||
| CN201811453598 | 2018-11-30 |
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| CN109707465A CN109707465A (en) | 2019-05-03 |
| CN109707465B true CN109707465B (en) | 2021-09-21 |
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| CN201811609143.7A Active CN109707465B (en) | 2018-11-30 | 2018-12-27 | Adjustable device and method for steam extraction of steam turbine |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115853605B (en) * | 2022-12-01 | 2024-06-14 | 东方电气集团东方汽轮机有限公司 | Industrial steam extraction regulating valve of steam turbine |
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| CN1033676A (en) * | 1987-12-18 | 1989-07-05 | 涡轮机制造生产联合企业“列宁格勒金属厂” | Steam turbine |
| US4948331A (en) * | 1989-07-31 | 1990-08-14 | General Electric Company | High pressure industrial turbine casing |
| US5695317A (en) * | 1995-12-07 | 1997-12-09 | Asea Brown Boveri Ag | Steam turbine |
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