CN108799536B - Main valve stem structure - Google Patents
Main valve stem structure Download PDFInfo
- Publication number
- CN108799536B CN108799536B CN201810959647.5A CN201810959647A CN108799536B CN 108799536 B CN108799536 B CN 108799536B CN 201810959647 A CN201810959647 A CN 201810959647A CN 108799536 B CN108799536 B CN 108799536B
- Authority
- CN
- China
- Prior art keywords
- valve rod
- thread ring
- internal thread
- seal body
- steam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 210000004907 gland Anatomy 0.000 claims description 9
- 238000000605 extraction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
- F16K3/262—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member with a transverse bore in the valve member
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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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to a valve rod structure of a main valve, wherein a through hole is formed in a steam seal body, a concave table is arranged in the through hole, and a sealing inclined plane is arranged at the upper end of the concave table; the lower part of the valve rod is provided with an internal thread ring and an external thread ring to form a valve rod assembly, the internal thread ring is fixedly connected with the lower part of the valve rod through threads, and the upper end plane of the internal thread ring is tightly attached to the T-shaped step surface of the valve rod in a sealing manner; the valve rod assembly penetrates through the steam seal body and can move along the axis of the steam seal body, an annular groove is formed between a concave table of the steam seal body and the valve rod assembly, and a radial through hole is formed in a position corresponding to the annular groove; after the main valve is completely opened, the shoulder inclined plane at the upper end of the internal thread ring is in contact and close connection with the sealing inclined plane at the upper end of the concave table of the steam seal body, so that the steam leakage of the valve rod is blocked. The main valve rod is simple in structure, convenient to assemble, fully utilizes space, reduces overall size, can effectively reduce steam leakage of the valve rod, and improves the overall efficiency of the steam turbine. Can be expanded and applied to the similar marine turbine units.
Description
Technical Field
The invention relates to a main valve of a marine steam turbine, in particular to a valve rod of the main valve of the marine steam turbine.
Background
The main valve rod structure of the steam turbine has great influence on the clearance steam leakage amount, the valve rod assembly difficulty and the overall size of the valve. At present, valve rods of a marine steam turbine generator unit mainly adopt two structural forms, and the two valve rods have advantages and disadvantages.
A valve stem has no sealing shoulder (figure 1), and the distance between the half and the valve casing is used for determining the valve stroke, and the valve stroke occupies the whole size. The valve rod adopts the form of thick two thin in the middle, and the assembly is comparatively simple, and valve rod and gland sealing body must guarantee certain clearance, therefore the valve produces great leakage of steam volume all the time.
Another valve stem has a sealing shoulder (fig. 2), and the valve travel is determined by the valve stem shoulder and the gland recess, so that the valve travel does not occupy the whole size. The contact surface of the valve rod shoulder and the gland sealing body concave table is sealed after grinding, and the steam leakage amount is very small after the valve is opened. However, since the valve rod is thick at one end and thin at the other end, the assembly must be performed in a single direction.
Disclosure of Invention
The invention aims to provide a main valve rod structure which can reduce the assembly difficulty of the main valve rod, reduce the steam leakage of the valve rod and reduce the overall size of the valve.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the main valve rod structure comprises a steam seal body, a valve rod, an internal thread ring and an external thread ring, wherein a through hole is formed in the steam seal body, a concave table is arranged in the through hole, and a sealing inclined plane is arranged at the upper end of the concave table; the lower part of the valve rod is provided with an internal thread ring and an external thread ring to form a valve rod assembly, the internal thread ring is fixedly connected with the lower part of the valve rod through threads, and the upper end plane of the internal thread ring is tightly attached to the T-shaped step surface of the valve rod in a sealing manner; the valve rod assembly penetrates through the steam seal body and can move along the axis of the steam seal body, an annular groove is formed between a concave table of the steam seal body and the valve rod assembly, and a radial through hole is formed in a position corresponding to the annular groove; after the main valve is completely opened, the shoulder inclined plane at the upper end of the internal thread ring is in contact and close connection with the sealing inclined plane at the upper end of the concave table of the steam seal body, so that the steam leakage of the valve rod is blocked.
Further, radial small holes are formed in the positions, corresponding to the through holes, of the lower portion of the inner threaded ring.
Further, the external thread ring is in threaded connection with the valve rod and is in locking connection with the internal thread ring.
Furthermore, fork-shaped structures for fastening the fork-shaped wrench are arranged at the lower parts of the inner thread ring and the outer thread ring.
Further, the main valve rod structure is integrally sleeved in the valve casing.
The beneficial effects of the invention are as follows:
The invention adopts the way that the upper end surface of the internal thread ring is tightly attached to the step surface of the valve rod, and the inclined surface shoulder of the internal thread ring is ground with the inclined surface in the gland sealing body concave table, so that the contact surface of the internal thread ring, the valve rod and the gland sealing body is tightly attached after the valve reaches the opening position, and the steam leakage of the whole valve rod is extremely small. The full-open stroke of the valve is limited by the ground inclined plane between the internal thread ring and the steam seal body. The steam seal body is provided with a suction hole at the contact surface with the valve shell, and the inner thread ring is provided with a small hole at the lower part corresponding to the suction hole of the steam seal body, so that all the leakage steam of the valve rod is sent to the suction system without leaking into the external environment.
The main valve rod is simple in structure, convenient to assemble, fully utilizes space, reduces overall size, can effectively reduce steam leakage of the valve rod, and improves the overall efficiency of the steam turbine. Can be expanded and applied to the similar marine turbine units.
Drawings
FIG. 1 is a schematic illustration of a valve stem structure without a sealing shoulder of a prior art marine steam turbine;
FIG. 2 is a schematic view of a valve stem structure with a sealing shoulder of a prior art marine steam turbine;
FIG. 3 is a schematic view of the main valve stem structure of the present invention when the main valve is not fully opened;
FIG. 4 is a schematic view of the valve stem structure of the main valve after the main valve is fully opened;
FIG. 5 is a schematic view of a vapor seal;
FIG. 6 is a schematic illustration of a valve stem configuration;
FIG. 7 is a cross-sectional view of an internally threaded ring structure;
FIG. 8 is a cross-sectional view of an externally threaded ring structure;
Fig. 9 is a view in the direction a of fig. 7 and 8.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 3 to 9, a main valve stem structure of the present invention includes a gland casing 1, a stem 2, an internally threaded ring 3, and an externally threaded ring 4.
The steam seal body 1 is pressed in the main valve shell, and is internally provided with a through hole, a concave table and an annular groove. Radial through holes 5 are formed in the corresponding positions of the annular grooves, and the upper edge of the concave table is an inclined plane Y6. The internal thread ring 3 is assembled at the lower part of the valve rod 2 in a threaded connection mode, the upper end face 8 of the internal thread ring 3 and the T-shaped step face 7 matched with the internal thread ring 2 on the valve rod 2 are high in flatness and perpendicularity with an axis, so that the internal thread ring 3 is tightly attached after assembly, a through hole structure is adopted at the lower half section of the internal thread ring 3, and radial small holes 9 are formed at corresponding positions. An externally threaded ring 4 is fitted under the internally threaded ring 3 for locking the internally threaded ring 3. The lower parts of the inner and outer threaded rings 3,4 are provided with fork-shaped structures 11 (see fig. 9), which can be fastened by means of a fork spanner. The inner and outer threaded rings 3,4 and the valve rod 2 are assembled into a valve rod assembly, and the inclined surface X10 of the inner threaded ring 3 and the inclined surface Y6 of the gland sealing body 1 are ground to be closed. The valve stem assembly passes through the gland 1 and moves along the axis. All parts are made of steel, and the contact surfaces among the parts are subjected to surface treatment, so that the parts have high hardness to prevent abrasion and jamming.
When the main valve is not completely opened, the internal thread ring 3 is not contacted with the grinding surface of the steam seal body 1, and the air extraction system extracts a large amount of air leakage of the valve rod 2 through the annular groove of the steam seal body communicated with the air extraction system. After the main valve is completely opened, the internal thread ring 3 is in contact with the grinding surface of the steam seal body 1, and the contact surface of the internal thread ring 3 and the valve rod 2 is fixed, so that the steam leakage of the valve rod 2 can be basically blocked. At this time, the steam leakage through the micro valve rod 2 of the two contact surfaces is pumped out by the air pumping system through the small holes on the internal thread ring 3 and the annular groove of the steam seal body 1, so as to prevent the steam leakage into the external environment.
Claims (2)
1. A main valve stem structure comprises gland sealing body, valve stem, internal thread ring, external thread ring, its characterized in that: the steam seal body is internally provided with a through hole, a concave table is arranged in the through hole, and the upper end of the concave table is provided with a sealing inclined plane; the lower part of the valve rod is provided with an internal thread ring and an external thread ring to form a valve rod assembly, the internal thread ring is fixedly connected with the lower part of the valve rod through threads, and the upper end plane of the internal thread ring is tightly attached to the T-shaped step surface of the valve rod in a sealing manner; the valve rod assembly penetrates through the steam seal body and can move along the axis of the steam seal body, an annular groove is formed between a concave table of the steam seal body and the valve rod assembly, and a radial through hole is formed in a position corresponding to the annular groove; when the main valve is completely opened, the shoulder inclined plane at the upper end of the internal thread ring is in contact and sealing connection with the sealing inclined plane at the upper end of the concave table of the steam seal body, so as to isolate the steam leakage of the valve rod; radial small holes are formed in the positions corresponding to the through holes in the lower part of the internal thread ring; the external thread ring is in threaded connection with the valve rod and is in locking connection with the internal thread ring; and fork-shaped structures for fastening the fork-shaped wrench are arranged at the lower parts of the inner thread ring and the outer thread ring.
2. The main valve stem structure according to claim 1, wherein: the main valve rod structure is integrally sleeved in the valve casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959647.5A CN108799536B (en) | 2018-08-16 | 2018-08-16 | Main valve stem structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959647.5A CN108799536B (en) | 2018-08-16 | 2018-08-16 | Main valve stem structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108799536A CN108799536A (en) | 2018-11-13 |
| CN108799536B true CN108799536B (en) | 2024-06-04 |
Family
ID=64080714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810959647.5A Active CN108799536B (en) | 2018-08-16 | 2018-08-16 | Main valve stem structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108799536B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137728Y (en) * | 2007-12-14 | 2008-10-22 | 陈美诗 | Air pumping valve |
| CN201259012Y (en) * | 2008-08-22 | 2009-06-17 | 安徽省屯溪高压阀门有限公司 | Automatic seal stop valve |
| CN101713302A (en) * | 2009-10-21 | 2010-05-26 | 中国核电工程有限公司 | Steam open type main throttle valve |
| CN102434228A (en) * | 2011-11-24 | 2012-05-02 | 哈尔滨汽轮机厂有限责任公司 | Adjusting mechanism for steam extraction pressure for steam extraction turbine |
| CN102787871A (en) * | 2012-07-10 | 2012-11-21 | 东方电气集团东方汽轮机有限公司 | Main steam valve of steam turbine |
| CN203560469U (en) * | 2013-10-17 | 2014-04-23 | 浙江浙能北仑发电有限公司 | Steam leakage recycling structure for high-pressure valve |
| CN206874953U (en) * | 2017-07-04 | 2018-01-12 | 成都市蜀科科技有限责任公司 | A kind of steam turbine intermediate pressure main stop valve valve rod sealing device |
| CN208871071U (en) * | 2018-08-16 | 2019-05-17 | 中国船舶重工集团公司第七0四研究所 | Main inlet throttle-stop valve stem structure |
-
2018
- 2018-08-16 CN CN201810959647.5A patent/CN108799536B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137728Y (en) * | 2007-12-14 | 2008-10-22 | 陈美诗 | Air pumping valve |
| CN201259012Y (en) * | 2008-08-22 | 2009-06-17 | 安徽省屯溪高压阀门有限公司 | Automatic seal stop valve |
| CN101713302A (en) * | 2009-10-21 | 2010-05-26 | 中国核电工程有限公司 | Steam open type main throttle valve |
| CN102434228A (en) * | 2011-11-24 | 2012-05-02 | 哈尔滨汽轮机厂有限责任公司 | Adjusting mechanism for steam extraction pressure for steam extraction turbine |
| CN102787871A (en) * | 2012-07-10 | 2012-11-21 | 东方电气集团东方汽轮机有限公司 | Main steam valve of steam turbine |
| CN203560469U (en) * | 2013-10-17 | 2014-04-23 | 浙江浙能北仑发电有限公司 | Steam leakage recycling structure for high-pressure valve |
| CN206874953U (en) * | 2017-07-04 | 2018-01-12 | 成都市蜀科科技有限责任公司 | A kind of steam turbine intermediate pressure main stop valve valve rod sealing device |
| CN208871071U (en) * | 2018-08-16 | 2019-05-17 | 中国船舶重工集团公司第七0四研究所 | Main inlet throttle-stop valve stem structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108799536A (en) | 2018-11-13 |
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