CN114508388B - Double-exhaust combined steam valve flow guiding structure - Google Patents
Double-exhaust combined steam valve flow guiding structure Download PDFInfo
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- CN114508388B CN114508388B CN202111634571.7A CN202111634571A CN114508388B CN 114508388 B CN114508388 B CN 114508388B CN 202111634571 A CN202111634571 A CN 202111634571A CN 114508388 B CN114508388 B CN 114508388B
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- steam
- exhaust
- cavity
- flow guiding
- ridge
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
-
- 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
- F01D25/30—Exhaust heads, chambers, or the like
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Housings (AREA)
Abstract
The invention discloses a double-exhaust combined steam valve flow guiding structure which comprises a steam inlet pipeline, a steam inlet cavity, a throat flow passage and a steam exhaust cavity, wherein the steam inlet pipeline is communicated with the steam inlet cavity, and the steam inlet cavity is communicated with the steam exhaust cavity through the throat flow passage; two flow guiding ridges are arranged in the steam exhaust cavity, the flow guiding ridges extend from the top of the steam exhaust cavity to the bottom of the steam exhaust cavity, the steam exhaust cavity is divided into a first steam exhaust cavity and a second steam exhaust cavity, and the first steam exhaust cavity and the second steam exhaust cavity are respectively communicated with a steam exhaust pipeline. By adopting the double-exhaust combined steam valve diversion structure, the local steam flow collision and vortex in the steam exhaust cavity of the combined steam valve are obviously reduced, the steam flow uniformity and stability are effectively improved, the flow loss in the valve is reduced, and the flow in the two steam exhaust pipelines is basically equal and stable.
Description
Technical Field
The invention relates to a double-exhaust combined steam valve flow guiding structure, and belongs to the technical field of steam turbine valves.
Background
The combined steam valve is a commonly used steam turbine valve form and is characterized in that the main steam valve and the regulating valve share a valve shell and a valve seat, and compared with a split valve, the combined steam valve has the advantages of compact structure, lower cost and the like. The economical efficiency and the stability of the combined steam valve are improved, the method has important significance for the efficient and safe operation of the steam turbine, and the method also accords with the national green and low-carbon development planning.
Referring to fig. 1, the steam flow of the conventional combined steam valve enters an annular steam inlet chamber at the top of the combined steam valve through a steam inlet pipeline, a filter screen structure is usually arranged in the chamber, after being mixed in the chamber, the steam flow flows downwards, enters a steam outlet chamber at the bottom of the combined steam valve through a throat flow passage formed by a main steam valve disc, a regulating valve disc and a valve seat, and finally enters a downstream cylinder through a steam outlet pipeline. In order to meet the demands of unit pipeline arrangement, many combined steam valves are in a single-steam inlet and double-steam exhaust mode. This structure has two main disadvantages: on one hand, the steam flow can obviously accelerate after passing through the throat flow passage, and strong rotation and collision are formed in the steam exhaust chamber, so that larger energy loss is caused, and even the operation stability of the combined steam valve is influenced; on the other hand, the instability of the steam flow in the steam exhaust chamber can be further aggravated by the double steam exhaust pipelines, so that the flow difference and fluctuation in the two steam exhaust pipelines are larger, the uniformity and stability of the flow in the steam inlet chamber of the downstream cylinder are affected, and the energy loss is caused.
Disclosure of Invention
The invention aims at: aiming at the problems, the invention provides the double-exhaust combined steam valve diversion structure, which can obviously reduce the local steam collision and vortex in the steam exhaust cavity of the combined steam valve, effectively improve the uniformity and stability of steam flow, reduce the flow loss in the valve and ensure the basically equal and stable flow in two steam exhaust pipelines.
The technical scheme adopted by the invention is as follows:
the double-exhaust combined steam valve flow guiding structure comprises a steam inlet pipeline, a steam inlet cavity, a throat flow passage and a steam exhaust cavity, wherein the steam inlet pipeline is communicated with the steam inlet cavity, and the steam inlet cavity is communicated with the steam exhaust cavity through the throat flow passage;
two flow guiding ridges are arranged in the steam exhaust cavity, the flow guiding ridges extend from the top of the steam exhaust cavity to the bottom of the steam exhaust cavity, the steam exhaust cavity is divided into a first steam exhaust cavity and a second steam exhaust cavity, and the first steam exhaust cavity and the second steam exhaust cavity are respectively communicated with a steam exhaust pipeline.
In the invention, the steam exhaust cavity is divided into two areas by arranging the two guide ridges, so that the rotation of steam flow in the steam exhaust cavity can be weakened, and the energy loss in the steam exhaust cavity can be reduced.
Preferably, the two guide ridges are symmetrically arranged in the longitudinal direction.
In the scheme, the first steam exhaust cavity and the second steam exhaust cavity are the same through symmetrical arrangement, the steam exhaust cavity is equally divided into two parts, the flow in the two pipelines can be ensured to be basically equal and stable, and the influence of flow difference and fluctuation on the flow in the steam inlet chamber of the downstream cylinder is avoided.
Preferably, the symmetrical center line of the flow guiding ridge is the same as the direction of the steam inlet pipeline.
In the scheme, the steam flow of the steam inlet pipeline can be equally divided into the first steam exhaust cavity and the second steam exhaust cavity, and the flow stability of the steam flow is ensured.
Preferably, the two steam exhaust pipelines are symmetrically arranged at two sides of the flow guiding ridge.
In the scheme, the symmetrical arrangement is beneficial to the equal and stable exhaust flow of the two exhaust pipelines.
Preferably, the flow guiding ridge comprises a first ridge surface and a second ridge surface, and the first ridge surface and the second ridge surface extend from top to bottom to side surfaces.
In the scheme, the airflow of the throat flow channel is guided to the two sides through the flow guiding ridge, so that the airflow flows to the two steam exhaust pipelines more orderly, the collision and vortex of the airflow in the middle area of the two steam exhaust pipelines are weakened, the energy loss is reduced, the flow in the valve is more stable, and the economical efficiency and the safety of the valve operation are further improved.
Preferably, the cross-sectional area of the flow guiding ridge increases from top to bottom.
In the scheme, the flow characteristics are more accordant, and the energy loss caused by the fact that the steam flow of the throat flow channel directly impacts the top end face of the flow guiding ridge is avoided on the premise of guaranteeing the flow guiding effect.
Preferably, the cross section of the flow guiding ridge is in a V shape, and the angles of the V shapes of the cross sections from top to bottom are the same.
Preferably, the V-shaped angle of the cross section is 10 DEG to 20 deg.
Preferably, the cross-section is rounded at the "V" shaped end.
In the scheme, the rounding treatment avoids the thin end part of the sharp corner, and deformation is caused under the impact of steam flow on two sides.
Preferably, the guide ridge and the wall surface of the steam exhaust cavity are in arc transition.
In the scheme, the steam flow stability is ensured through arc transition, and local steam flow vortex is avoided.
Preferably, the guide ridge is integrally formed with the valve housing.
In the scheme, the valve shell of the combined steam valve is a casting, the diversion ridge and the valve shell are cast together, the processing is easy, the assembly is not needed, the cost increase is very small, and the large-scale popularization is realized.
According to the double-exhaust combined steam valve flow guiding structure, the flow guiding ridge is added in the bottom steam exhaust cavity of the traditional combined steam valve, so that the flow in the steam exhaust cavity can be improved, the local steam flow collision and rotation are weakened, the steam flow uniformity and stability are improved, the energy loss is reduced, the basically equal and stable flow in two steam exhaust pipelines can be ensured, and the influence of flow difference and fluctuation on the flow in the steam inlet of a downstream cylinder is avoided.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the diversion ridge divides the steam discharging cavity at the bottom of the combined steam valve into two areas, thereby weakening the rotation of steam flow in the steam discharging cavity and reducing the energy loss in the steam discharging cavity.
2. The flow guiding ridges guide the airflow of the throat flow channel to two sides, so that the airflow flows to the two steam exhaust pipelines more orderly, the collision and vortex of the airflow in the middle area of the two steam exhaust pipelines are weakened, the energy loss is reduced, the flow in the valve is more stable, and the economical efficiency and the safety of the valve operation are further improved.
3. The flow guiding ridge equally divides the steam exhaust chamber into two parts and respectively flows to the two steam exhaust pipelines, so that the flow in the two pipelines is basically equal and stable, and the influence of flow difference and fluctuation on the flow in the steam inlet chamber of the downstream cylinder is avoided.
4. The sectional area of the flow guiding ridge is gradually increased from the top to the bottom, so that the flow guiding ridge more accords with the flow characteristic, and the energy loss caused by the fact that the steam flow of the throat flow channel directly impacts the top end face of the flow guiding ridge is avoided under the premise of ensuring the flow guiding effect.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a prior art combination steam valve;
FIG. 2 is a schematic diagram of a combination steam valve in accordance with the present invention;
FIG. 3 is a cross-sectional view of the combination steam valve of the present invention;
FIG. 4 is a schematic view of the location of the guide ridge;
FIG. 5 is a schematic cross-sectional view of a flow-guiding ridge;
fig. 6 is a schematic perspective view of a deflector ridge.
The marks in the figure: the device comprises a 1-steam inlet pipeline, a 2-steam inlet chamber, a 3-throat runner, a 4-steam exhaust chamber, a 5-steam exhaust pipeline, a 6-flow guiding ridge, a 41-first steam exhaust chamber and a 42-second steam exhaust chamber.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
As shown in fig. 2-4, the double-exhaust combined steam valve diversion structure of the embodiment comprises a steam inlet pipeline 1, a steam inlet chamber 2, a throat flow passage 3 and a steam exhaust chamber 4, wherein the steam inlet pipeline 1 is communicated with the steam inlet chamber 2, and the steam inlet chamber 2 is communicated with the steam exhaust chamber 4 through the throat flow passage 3;
two flow guiding ridges 6 are arranged in the steam exhaust cavity 4, the flow guiding ridges 6 extend from the top of the steam exhaust cavity 4 to the bottom of the steam exhaust cavity 4, the steam exhaust cavity 4 is divided into a first steam exhaust cavity 41 and a second steam exhaust cavity 42, and the first steam exhaust cavity 41 and the second steam exhaust cavity 42 are respectively communicated with the steam exhaust pipeline 5.
In the embodiment, the two diversion ridges 6 divide the steam exhaust chamber 4 into two areas, so that the rotation of steam flow in the steam exhaust chamber 4 can be weakened, and the energy loss in the steam exhaust chamber 4 can be reduced.
As an alternative to the above embodiment, as shown in fig. 4, in other embodiments, two flow guiding ridges 6 are symmetrically arranged in the longitudinal direction, and the exhaust chamber 4 is equally divided into two parts, so that the flow in the two pipes can be ensured to be basically equal and stable, and the influence of flow difference and fluctuation on the flow in the intake chamber of the downstream cylinder is avoided.
As an alternative manner of the foregoing embodiment, in other embodiments, the symmetrical center line of the guide ridge 6 and the direction of the steam inlet pipe 1 are the same, so that the steam flow of the steam inlet pipe 1 is uniformly distributed into the first steam exhaust cavity 41 and the second steam exhaust cavity 42, and the flow stability of the steam flow is ensured.
As an alternative to the above embodiment, as shown in fig. 4, in other embodiments, two steam exhaust pipes 5 are symmetrically disposed at two sides of the guide ridge 6, that is, the included angles between the two steam exhaust pipes 5 and the center line of the guide ridge 6 are the same, which is beneficial for the equal and stable steam exhaust flow of the two steam exhaust pipes 5.
As an alternative manner of the above embodiment, in other embodiments, the flow guiding ridge 6 includes a first ridge surface and a second ridge surface, where the first ridge surface and the second ridge surface are symmetrically disposed, and the first ridge surface and the second ridge surface extend from top to bottom to the side surface, so that the airflow in the throat runner 3 is guided to two sides, so that the airflow flows to the two exhaust pipes 5 more orderly, the collision and vortex of the airflow in the middle area of the two exhaust pipes 5 are weakened, the energy loss is reduced, and the flow in the valve is more stable, and further the economical efficiency and safety of the valve operation are improved.
As an alternative to the above embodiment, as shown in fig. 6, in other embodiments, the cross-sectional area of the flow guiding ridge 6 increases from top to bottom in sequence, so that the flow characteristics are more consistent, and the energy loss caused by the direct impact of the steam flow of the throat flow channel 3 on the top end surface of the flow guiding ridge 6 is avoided under the premise of ensuring the flow guiding effect.
As an alternative to the above embodiment, as shown in fig. 5, in other embodiments, the cross section of the flow guiding ridge 6 is V-shaped, and the angles of the V-shapes of the cross sections are the same from top to bottom.
As an alternative to the above embodiments, in other embodiments the "V" shaped angle of the cross section is 10 ° to 20 °.
As an alternative to the above embodiment, as shown in fig. 5, in other embodiments, the "V" shaped end of the cross section is rounded to avoid the sharp corner end being thin and deforming under the impact of the two side streams.
As an alternative to the above embodiment, as shown in fig. 6, in other embodiments, the diversion ridge 6 and the wall surface of the steam exhaust chamber 4 pass through an arc transition, so as to ensure the stability of the steam and avoid the local steam vortex.
As an alternative to the above embodiment, in other embodiments, the guide ridge 6 is integrally formed with the valve housing, the valve housing of the combined steam valve is a casting, and the guide ridge 6 and the valve housing are cast together, so that the method is easy to process, does not need to be assembled, has very little cost increase, and is applicable to large-scale popularization.
In summary, by adopting the double-exhaust combined steam valve flow guiding structure, the flow guiding ridge is added in the bottom steam exhaust chamber of the traditional combined steam valve, so that the flow in the steam exhaust chamber can be improved, the local steam flow collision and rotation are weakened, the steam flow uniformity and stability are improved, the energy loss is reduced, the basically equal and stable flow in two steam exhaust pipelines can be ensured, and the influence of flow difference and fluctuation on the flow in the steam inlet chamber of the downstream cylinder is avoided.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (10)
1. The utility model provides a steam valve water conservancy diversion structure is united to double exhaust, includes steam inlet pipe (1), steam inlet cavity (2), throat runner (3) and steam exhaust cavity (4), steam inlet pipe (1) and steam inlet cavity (2) intercommunication, steam inlet cavity (2) are through throat runner (3) and steam exhaust cavity (4) intercommunication, its characterized in that: two flow guiding ridges (6) are arranged in the steam exhaust cavity (4), the flow guiding ridges (6) extend from the top of the steam exhaust cavity (4) to the bottom of the steam exhaust cavity (4), the steam exhaust cavity (4) is divided into a first steam exhaust cavity (41) and a second steam exhaust cavity (42), and the first steam exhaust cavity (41) and the second steam exhaust cavity (42) are respectively communicated with a steam exhaust pipeline (5).
2. The double exhaust combined steam valve flow guiding structure as set forth in claim 1, wherein: the two diversion ridges (6) are symmetrically arranged in the longitudinal direction.
3. The double exhaust combined steam valve guide structure according to claim 2, wherein: the symmetrical center line of the guide ridge (6) is the same as the direction of the steam inlet pipeline (1).
4. The double exhaust combined steam valve guide structure according to claim 2, wherein: the two steam exhaust pipelines (5) are symmetrically arranged at two sides of the flow guiding ridge (6).
5. The double exhaust combined steam valve flow guiding structure as set forth in claim 1, wherein: the flow guiding ridge (6) comprises a first ridge surface and a second ridge surface, and the first ridge surface and the second ridge surface extend from top to bottom to the side surface.
6. The double exhaust combined steam valve flow guiding structure as set forth in claim 1, wherein: the cross-sectional area of the flow guiding ridge (6) is sequentially increased from top to bottom.
7. The double exhaust combined steam valve flow guiding structure as defined in claim 6, wherein: the cross section of the flow guiding ridge (6) is of a V shape, and the angles of the V shapes of the cross sections from top to bottom are the same.
8. The double exhaust combined steam valve flow guiding structure as defined in claim 6, wherein: the V-shaped end of the section is rounded.
9. The double exhaust combined steam valve flow guiding structure as set forth in claim 1, wherein: the guide ridge (6) is in arc transition with the wall surface of the steam exhaust cavity (4).
10. The double exhaust combined steam valve flow guiding structure as set forth in claim 1, wherein: the diversion ridge (6) and the valve casing are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111634571.7A CN114508388B (en) | 2021-12-29 | 2021-12-29 | Double-exhaust combined steam valve flow guiding structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111634571.7A CN114508388B (en) | 2021-12-29 | 2021-12-29 | Double-exhaust combined steam valve flow guiding structure |
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| CN114508388A CN114508388A (en) | 2022-05-17 |
| CN114508388B true CN114508388B (en) | 2023-07-18 |
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