CN108799536A - Main inlet throttle-stop valve stem structure - Google Patents
Main inlet throttle-stop valve stem structure Download PDFInfo
- Publication number
- CN108799536A CN108799536A CN201810959647.5A CN201810959647A CN108799536A CN 108799536 A CN108799536 A CN 108799536A CN 201810959647 A CN201810959647 A CN 201810959647A CN 108799536 A CN108799536 A CN 108799536A
- Authority
- CN
- China
- Prior art keywords
- thread ring
- main inlet
- inlet throttle
- internal thread
- stop valve
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000000284 extract Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
Classifications
-
- 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
It the present invention relates to a kind of main inlet throttle-stop valve stem structure, is offered inside labyrinth casing and is equipped with concave station in through-hole, through-hole, concave station upper end is equipped with sealing inclined-plane；The stem lower portion is equipped with internal thread ring and external screw thread ring, constitutes valve rod assembly, the internal thread ring is fixedly connected by screw thread with stem lower portion, and the upper transverse plane of internal thread ring is close to be tightly connected with the T shape step surfaces of valve rod；The valve rod assembly passes through labyrinth casing, and annular groove can be formed between labyrinth casing axial-movement, the concave station and valve rod assembly of the labyrinth casing, and annular groove corresponding position is provided with radial through-hole；After main inlet throttle-stop valve fully opens, the convex shoulder inclined-plane of the upper end of the internal thread ring contacts close connection with the sealing inclined-plane of the concave station upper end of labyrinth casing, separates valve stem leakoff.The main inlet throttle-stop valve stem structure of the present invention is simple, convenient for assembly, makes full use of space, reduces overall dimension, can effectively reduce valve stem leakoff, improves steam turbine overall efficiency.It is expansible to be applied to similar marine turbing group.
Description
Technical field
The present invention relates to a kind of marine turbing main inlet throttle-stop valve, especially a kind of marine turbing main inlet throttle-stop valve valve rod.
Background technology
The main inlet throttle-stop valve stem structure of steam turbine has larger shadow to gap steam loss, valve rod assembly difficulty and valve overall dimension
It rings.Currently, ship turbine-generator group valve rod mainly uses two kinds of structure types, both valve rods respectively to have its advantage and disadvantage.
A kind of valve rod determines valve stroke, valve stroke without sealing convex shoulder (Fig. 1) using the spacing of 2 half Houghs and valve casing
Overall dimension need to be occupied.For valve rod using the thin form in intermediate thick both ends, assembly is relatively simple, and valve rod must assure that one with labyrinth casing
Fixed gap, therefore valve generates larger steam loss always.
Another valve rod band sealing convex shoulder (Fig. 2) determines valve stroke, valve row using valve rod convex shoulder and labyrinth casing concave station
Journey can be not take up overall dimension.The contact surface of valve rod convex shoulder and labyrinth casing concave station is ground rear closely sealed, valve opening back leak vapour
It measures minimum.But since valve rod is the thin form in the thick one end in one end, assembling must one direction progress.
Invention content
The present invention is to provide for a kind of main inlet throttle-stop valve stem structure, which can reduce main inlet throttle-stop valve valve rod assembly difficulty, reduces
Valve stem leakoff reduces valve overall dimension.
To achieve the above object, the technical scheme is that：A kind of main inlet throttle-stop valve stem structure, by labyrinth casing, valve rod, interior
Screwed ring, external screw thread ring form, and are offered inside the labyrinth casing and are equipped with concave station in through-hole, through-hole, and concave station upper end is equipped with sealing
Inclined-plane；The stem lower portion is equipped with internal thread ring and external screw thread ring, constitutes valve rod assembly, and the internal thread ring passes through screw thread and valve
Bar lower part is fixedly connected, and the upper transverse plane of internal thread ring is close to be tightly connected with the T shape step surfaces of valve rod；The valve rod assembly
Across labyrinth casing, and annular groove can be formed between labyrinth casing axial-movement, the concave station and valve rod assembly of the labyrinth casing, annular
Slot corresponding position is provided with radial through-hole；After main inlet throttle-stop valve fully opens, the convex shoulder inclined-plane and packing of the upper end of the internal thread ring
The sealing inclined-plane of the concave station upper end of body contacts close connection, separates valve stem leakoff.
Further, the through-hole corresponding position of internal thread ring lower part is provided with radial hole.
Further, the external screw thread ring is connect with threaded stem, and is locked and connected with internal thread ring.
Further, internal and external screw thread ring lower part is equipped with the fork configuration fastened for fork wrench.
Further, the main inlet throttle-stop valve stem structure integral assembling is in valve casing.
Beneficial effects of the present invention effect is：
The present invention is close to using the upper surface of internal thread ring with the step surface of valve rod, and recessed with its inclined-plane convex shoulder and labyrinth casing
Bevel ground in platform, it is ensured that after valve reaches open position, internal thread ring and the contact surface of valve rod and labyrinth casing are closely sealed,
Keep the steam loss of entire valve rod minimum.The standard-sized sheet stroke of valve is limited by inclined-plane ground between internal thread ring and labyrinth casing.
Labyrinth casing with valve casing contact surface at be provided with aspirating hole, internal thread ring is corresponded in lower part is provided with aperture at the aspirating hole of labyrinth casing,
To make all valve stem leakoffs be sent to extract system without leaking into external environment.
The main inlet throttle-stop valve stem structure of the present invention is simple, convenient for assembly, makes full use of space, reduces overall dimension, can be effective
Valve stem leakoff is reduced, steam turbine overall efficiency is improved.It is expansible to be applied to similar marine turbing group.
Description of the drawings
Fig. 1 is the stem structure schematic diagram without sealing convex shoulder of existing marine turbing；
Fig. 2 is that the band of existing marine turbing seals the stem structure schematic diagram of convex shoulder；
Fig. 3 is structural schematic diagram of the main inlet throttle-stop valve stem structure of the present invention when main inlet throttle-stop valve does not fully open；
Fig. 4 is structural schematic diagram of the main inlet throttle-stop valve stem structure of the present invention after main inlet throttle-stop valve fully opens；
Fig. 5 is labyrinth casing structural schematic diagram；
Fig. 6 is stem structure schematic diagram；
Fig. 7 is internal thread ring structure sectional view；
Fig. 8 is external screw thread ring structure sectional view；
Fig. 9 is Fig. 7, A direction views in 8.
Specific implementation mode
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 3 to Fig. 9, a kind of main inlet throttle-stop valve stem structure of the invention, including labyrinth casing 1, valve rod 2, internal thread ring
3, external screw thread ring 4.
Labyrinth casing 1 is fitted in main inlet throttle-stop valve shell, and inside is provided with through-hole, concave station and annular groove.And correspond to position in annular groove
It sets and is provided with radial through-hole 5, concave station upper limb is inclined-plane Y6.Internal thread ring 3 is threadedly coupled mode and is assemblied in 2 lower part of valve rod, interior spiral shell
T shapes step surface 7 with matching has very high self level and vertical with axis on the upper surface 8 of line ring 3 and valve rod 2
Degree, so that it is guaranteed that being close to after assembly, 3 lower semisection of internal thread ring uses through-hole structure, and is provided with radial hole 9 in corresponding position.
External screw thread ring 4 is assemblied in 3 lower section of internal thread ring, for locking internal thread ring 3.3,4 lower part of internal and external screw thread ring is all made of fork-shaped
Structure 11 (see Fig. 9), is fastened using fork wrench.Internal and external screw thread ring 3,4 is valve rod assembly with the assembly of valve rod 2, and with
The inclined-plane Y6 phase grindings of the inclined-plane X10 of internal thread ring 3 and labyrinth casing 1 are to closely sealed.Valve rod assembly passes through labyrinth casing 1, and along axis
Movement.Each part is all made of steel, and mutual contact surface by surface treatment, has very high hardness, to prevent it
Abrasion and bite.
When main inlet throttle-stop valve does not fully open, the abradant surface of internal thread ring 3 and labyrinth casing 1 not in contact with, extract system pass through with
Its labyrinth casing annular groove being connected extracts a large amount of valve rod 2 and leaks vapour.After main inlet throttle-stop valve fully opens, internal thread ring 3 and labyrinth casing 1
Abradant surface contact, and internal thread ring 3 and the contact surface of valve rod 2 have originally been fixed, and can separate the leakage vapour of valve rod 2 substantially.At this point, passing through
The micro valve rod 2 of the two contact surfaces, which leaks vapour, to be taken out by the annular groove of aperture, labyrinth casing 1 on internal thread ring 3 by extract system
It removes, prevents it from leaking into external environment.
Claims (5)
1. a kind of main inlet throttle-stop valve stem structure is made of labyrinth casing, valve rod, internal thread ring, external screw thread ring, it is characterised in that：It is described
It is offered inside labyrinth casing and is equipped with concave station in through-hole, through-hole, concave station upper end is equipped with sealing inclined-plane；The stem lower portion is equipped with interior spiral shell
Line ring and external screw thread ring constitute valve rod assembly, and the internal thread ring is fixedly connected by screw thread with stem lower portion, and internal thread ring
Upper transverse plane be close to be tightly connected with the T shape step surfaces of valve rod；The valve rod assembly passes through labyrinth casing, and can be along labyrinth casing axis
Line moves, and annular groove is formed between the concave station and valve rod assembly of the labyrinth casing, annular groove corresponding position is provided with radial through-hole；When
After main inlet throttle-stop valve fully opens, the convex shoulder inclined-plane of the upper end of the internal thread ring is contacted with the sealing inclined-plane of the concave station upper end of labyrinth casing
Close connection separates valve stem leakoff.
2. main inlet throttle-stop valve stem structure according to claim 1, it is characterised in that：The through-hole of internal thread ring lower part corresponds to
Position is provided with radial hole.
3. main inlet throttle-stop valve stem structure according to claim 1, it is characterised in that：The external screw thread ring connects with threaded stem
It connects, and locks and connect with internal thread ring.
4. main inlet throttle-stop valve stem structure according to claim 1, it is characterised in that：Internal and external screw thread ring lower part is equipped with
The fork configuration fastened for fork wrench.
5. according to any main inlet throttle-stop valve stem structures of claim 1-4, it is characterised in that：The main inlet throttle-stop valve stem structure is whole
Body is sleeved in 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 true CN108799536A (en) | 2018-11-13 |
| CN108799536B 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 |
|---|---|
| CN108799536B (en) | 2024-06-04 |
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