CN206874825U - Protection against erosion bypass valve - Google Patents
Protection against erosion bypass valve Download PDFInfo
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- CN206874825U CN206874825U CN201720701360.3U CN201720701360U CN206874825U CN 206874825 U CN206874825 U CN 206874825U CN 201720701360 U CN201720701360 U CN 201720701360U CN 206874825 U CN206874825 U CN 206874825U
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- valve
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- main
- equalizing
- throat bushing
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Abstract
It the utility model is related to a kind of protection against erosion bypass valve, bonnet including valve body and on valve body, also include valve seat, throat bushing, main valve clack, equalizing valve valve and valve rod, the valve body is provided with valve inlet, valve export and valve pocket, the valve seat is located in the valve pocket and forms main valve sealing pair with the main valve clack, the throat bushing is vertically installed in the valve pocket and upper and lower side bears against the bonnet and the valve seat, the main valve clack is located inside the throat bushing and is slidably matched with the throat bushing, the main valve clack center is provided with equalizing valve valve mounting hole, the bottom of the equalizing valve valve mounting hole forms equalizing valve seat and with the equalizing valve lobed into equalizing valve sealing pair, the valve rod is stretched into the valve pocket through the through hole in bonnet center, the equalizing valve valve is arranged on the lower end of the valve rod.The utility model can effectively reduce steam and main valve is washed away, and realize better seal effect.
Description
Technical field
A kind of bypass valve is the utility model is related to, more particularly to a kind of protection against erosion valve mechanism for protecting sealing surface, is suitable to
The improvement of the low side valve sealing property of balanced type valve core structure.
Background technology
Bypath system is mainly used in coordinating the imbalance between boiler and steam turbine steam consumption.During unit starting, to mistake
Hot device and reheater system warm-up, start quickly speed.In unit load shedding, residual steam is discharged by bypath system,
Make boiler transient process operating mode stable.
All because interior the defects of leaking occurs in erosion failure, the interior leakage of low side valve makes again the low voltage bypass valve of many power plant at present
Vapours is without in, low pressure (LP) cylinder acting is directly discharged into condenser, makes the reduction of unit generation power, and heat consumption rate accordingly rises, directly
Influence the security and economy of power plant's operation.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of protection against erosion bypass valve, steam can be effectively reduced
Main valve is washed away, realizes better seal effect.
The technical solution of the utility model is：
A kind of protection against erosion bypass valve, including valve body and the bonnet on valve body, in addition to valve seat, throat bushing, main valve
Valve, equalizing valve valve and valve rod, the valve body are provided with valve inlet, valve export and valve pocket, and the valve seat is located in the valve pocket
And main valve sealing pair is formed with the main valve clack, the throat bushing is vertically installed in the valve pocket and upper and lower side bears against institute
Bonnet and the valve seat are stated, the side wall upper part and lower sidewall of the throat bushing, which are respectively equipped with pre-admission through hole and lead vapour, leads to
Hole, one end of the pre-admission through hole connect valve inlet by the valve pocket with the annular minim gap of the throttling inner room,
Valve pocket of the other end connection above main valve clack top surface stroke peak, one end connection valve inlet of the main admission opening,
The other end connects the valve pocket between valve seat and main valve clack top surface stroke minimum point, and the main valve clack is provided with protection against erosion flange,
The valve seat is provided with corresponding protection against erosion groove, and the main valve clack is located inside the throat bushing and slided with the throat bushing and matched somebody with somebody
Close, the center of the main valve clack is provided with the ladder hole of axial direction, and the diameter of the epimere of the ladder hole, stage casing and hypomere is successively
Reduce, the epimere of the ladder hole is slidably matched with the equalizing valve valve, stage casing built with disc spring, the ladder hole it is upper
Shoulder end face between section and stage casing is provided with equalizing valve seat that can be with the equalizing valve lobed into equalizing valve sealing pair, described
Valve rod is stretched into the valve pocket through the through hole in bonnet center, and the equalizing valve valve is arranged on the lower end of the valve rod.
The beneficial effects of the utility model are：
Due to the pressure difference of main valve clack both sides can be reduced using the design of equalizing valve, main valve is rushed so as to reduce steam
Brush, upward power is formed above main valve clack, realize valve quickly open and it is more laborsaving in Open valve；Due to using anti-
Steam directly washing away to main valve clack sealing surface can be prevented by rushing the design of flange, so as to protect main valve clack sealing surface；Due to valve
Using the double positioning of guide ring and maximum outside diameter between valve and throat bushing, it is ensured that valve event it is steady.
Brief description of the drawings
Fig. 1 is the utility model embodiment schematic diagram；
Fig. 2 is the utility model valve pocket inner structure figure；
Fig. 3 is the utility model main valve clack profile；
Fig. 4 is the utility model main valve clack Anti-scouring structure schematic diagram；
Fig. 5 is the utility model guide ring and decompression groove location partial enlarged drawing；
Fig. 6 is the utility model valve seat profile；
Fig. 7 is the structural representation of the utility model equalizing valve assembling.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings.
As shown in Fig. 1-Fig. 7, a kind of protection against erosion bypass valve the utility model is related to, including valve body 10 and on valve body
Bonnet, in addition to valve seat 8, throat bushing 4, main valve clack 3, equalizing valve valve 2 and valve rod 5, the valve body is provided with valve inlet, valve
Outlet and valve pocket, the valve seat 8 are located in the valve pocket and form main valve sealing pair with the main valve clack 3, and the throat bushing 4 is perpendicular
Directly be arranged on the valve pocket in, its upper end against（Connection）The bonnet, lower end against（Connection）The valve seat 8, specifically connects
Position is the sealing surface outer periphery of valve seat 8 and/or the valve interior wall of the outer periphery of valve seat 8, so that in sealing surface of seat
Together with the medium channel of side is interconnected with the medium channel in throat bushing, the medium on the outside of throat bushing only flows into throat bushing
After 4, be possible to distinguish through the medium channel on the inside of sealing surface of seat, the side wall upper part and lower sidewall of the throat bushing 4
Provided with pre-admission through hole and main via hole of inlet steam, one end of the pre-admission through hole passes through between the valve pocket and the throat bushing 4
Annular minim gap connects the valve inlet, valve pocket of the other end connection above main valve clack top surface stroke peak, institute
The one end for stating main admission opening connects the valve inlet, and other end connection is minimum positioned at the valve seat 8 and the top surface stroke of main valve clack 3
Valve pocket between point, the main valve clack 3 are provided with protection against erosion flange, and the valve seat is provided with corresponding protection against erosion groove, the main valve
Valve 3 is slidably matched positioned at the inside of throat bushing 4 and with the throat bushing 4, and the center of the main valve clack 3 is provided with the ladder of axial direction
Through hole, the diameter of the epimere of the ladder hole, stage casing and hypomere are sequentially reduced, and the epimere of the ladder hole pre- opens with described
Flap 2 is slidably matched, and built with disc spring 7, the shoulder end face between the epimere of the ladder hole and stage casing is provided with energy in stage casing
Enough equalizing valve seats that equalizing valve sealing pair is formed with the equalizing valve valve 2, the shoulder between the stage casing of the ladder hole and hypomere
You face forms the bottom supporting face of the disc spring, and the center through hole of the valve rod 5 through the bonnet is stretched into the valve pocket,
The equalizing valve valve 2 is arranged on the lower end of the valve rod 5.
In the boiler startup stage, can steam ensure have enough degrees of superheat arranged with pipe-line system, be hydrophobic and pre- before valve
Heat, and startup optimization mode etc. have much relations, otherwise easily produce moist steam or condensate, sealing surface during valve small guide vane
It is vulnerable to water erosion and washes away.Take apart after valve it can be seen that the defects of high speed steam flow washes away on valve clack sealing surface be present.
Preadmission steam vent of the present utility model connects the upper space of the valve inlet and throat bushing 4, belongs to normally open,
Steam enters the upper space of the throat bushing 4 by the preadmission steam vent.
During Open valve, the valve rod 5 drives the equalizing valve valve 2 to move up first, and the equalizing valve sealing pair is opened
Open, form the passage through the main valve clack 3, the steam of throat bushing upper space can enter the main valve clack 3 through the passage
The space of bottom, the pressure differential inside and outside the main valve clack 3 is on the one hand reduced in this way, can reduce steam stream
Erosion effect, on the other hand also play the effect of preheating, after the equalizing valve valve 2 fully opens, the equalizing valve
Valve 2 drives the main valve clack 3 to move upwardly together due to forming upward medium power after outflow medium, realizes the main valve clack
3 quick unlatching.
Preferably, the bottom of main valve clack 3 is provided with annular concave mouth, and the medial surface of the annular concave mouth is taper surface,
Lateral surface is cylindroid, and the round and smooth connection of interior lateral surface, the Outboard Sections of the annular concave mouth form annular erosion control flange, institute
State valve seat 8 and be provided with the annular male half coupling being engaged with the annular concave mouth and the annular being engaged with the annular erosion control flange
Erosion control groove, the medial surface of the medial surface of the annular concave mouth and the annular male half coupling form the main valve sealing pair, institute
Erosion control flange is stated to be processed into by pile-up welding hard alloy.
Flange is washed away described in being provided with the bottom of main valve clack 3 so that moment is opened and closed in the main valve clack 3, can
The effective steam that reduces washes away to the front of main valve sealing surface, reduces the possibility of the main valve sealing surface cavitation, enhances
The sealability of valve；The erosion control concave mouth is provided with the main valve clack bottom, the valve seat is provided with the erosion control male half coupling,
In opening-closing process steam will contact edge in the erosion control concave mouth first on the direction of flowing, and the main valve is avoided with this
Sealing surface is directly washed away by high velocity vapor；The erosion control flange handled by built-up welding has stronger erosion resistibility, in valve
Door opening-closing process in avoid steam, moist steam to sealing surface directly wash away, can play a part of protect sealing surface.
Preferably, the inside top of throat bushing 4 is provided with annular tongue-and-groove, the lateral wall of the tongue-and-groove at the top of throat bushing 4
Be fitted close with the madial wall of the valve pocket, the bonnet lower surface is provided with annular protrusion, the lateral wall of the annular protrusion and
The madial wall of the tongue-and-groove at the top of throat bushing 4 is fitted close, and is realized to the top radial positioning of throat bushing 4；The annular
Raised lower surface passes through the tongue-and-groove that is finally resisted against to compressions of sealing ring between throat bushing and valve body at the top of the throat bushing 4
On bottom surface, the upper axial of throat bushing 4 is positioned so as to realize.
Preferably, the bottom inside of throat bushing 4 is provided with annular tongue-and-groove, the madial wall of the tongue-and-groove of the bottom of throat bushing 4
It is fitted close, is formed to the bottom radial positioning of throat bushing 4, the top of valve seat 8 is by right with the lateral wall of the valve seat 8
The compression of sealing ring is finally resisted against on the bottom surface of the tongue-and-groove of the bottom of throat bushing 4 between valve seat and valve body, forms the throttling
Cover 4 bottom axially positions.
In this way, the throat bushing 4 is fixed in the valve pocket, radially or axially all without there is movement,
Because the main valve clack 3 and described 4 pairs of positioning of throat bushing are slidably matched, it ensure that the main valve clack 3 acts steady.
Preferably, the bottom surface of the top tongue-and-groove of throat bushing 4 is provided with some lifting screwed holes, with facilitate dismounting or
The parts in the valve pocket are taken out during maintenance.
Preferably, the bottom of valve seat 8 is provided with the shaft shoulder, the lower surface of the shaft shoulder and the base flange of throat bushing 4 it
Between form annular groove, is filled with some sealing rings 9 in the annular groove, avoids passing through the throat bushing 4 and the valve seat 8
Between combination gap at caused by leak.
Preferably, the middle part of the valve body 10 is in the curved of convex, is consequently formed the lower outside face of throat bushing 4
With the annular gap between the inwall of valve body 10, the main via hole of inlet steam is circumferentially distributed more on same axial location
Individual, the outer end of each main via hole of inlet steam connects the annular gap.
Preferably, the equalizing valve sealing pair uses cone seal, sealing cone by pile-up welding hard alloy post-processing and
Into the equalizing valve valve 2 is provided with the axially extending bore that some lower ports are located on the outside of equalizing valve sealing surface, in valve opening process
In, the medium above main valve clack is flowed out by the ladder hole of the axially extending bore and the main valve clack, due to valve pocket and throttling
The annular minim gap of set is less than the ladder hole of the axially extending bore and the main valve clack, and main valve clack upper dielectric has little time to mend
Fill so as to form the medium power of rising, realize that valve is opened rapidly by upward medium power.
Preferably, the valve rod 5 is locked with the equalizing valve valve 2 and is connected, and the top of the main valve clack 3 is provided with pre- opens to described
Flap 2 carries out spacing locknut 1.
Preferably, the locknut 1 is connected through a screw thread with the main valve clack 3, and is fixed by end face spot welding, this connection
Mode ensure that the locking connection between the locknut 1 and the main valve clack 3, between the equalizing valve valve 2 and the locknut 1
Adjustable range is constant, ensures that the stroke of the equalizing valve valve 2 does not change, so as to realize the stabilization of valve performance.
Preferably, the upper outside of the main valve clack 3 is provided with annular guide groove, and guide ring 6, institute are provided with the guide groove
State that the external diameter of guide ring 6 is identical with the internal diameter of throat bushing 4, the maximum outside diameter of the main valve clack 3 is preferably placed at the main valve clack 3
Bottom, at upper and lower two contact control the linear motion of the main valve clack 3, the middle part of main valve clack 3 is appropriate to reduce diameter, to reduce
The contact area of the main valve clack 3 and the throat bushing, mitigate abrasion, the lower section of guide ring 6 is provided with some relief grooves, can be with
Ensure sealing, meet the requirement to steam loss.
Equalizing valve of the present utility model can assemble in such a way：
The disc spring mounting hole places the disc spring 7, and the equalizing valve valve mounting hole is formed leads to the equalizing valve flap 2
To the equalizing valve seat is provided with sealing cone；The sealing cone forms by pile-up welding hard alloy post-processing.The equalizing valve
Flap 2 passes through close fit with the valve rod 5.
After the disc spring 7 loads the main valve clack, the equalizing valve flap 2 assembled is loaded with the valve rod 5, most
Compressed eventually by the locknut 1, compress and the combination disk spring 7 is compressed simultaneously, until the locknut and the main valve clack end
Face is contacted, and assembling rear end face spot welding is fixed.
Disclosed in the utility model it is each preferably with optional technological means, unless otherwise indicated and a preferred or optional skill
Art means are outside the further restriction of another technological means, can form some different technical schemes in any combination.
Claims (10)
1. a kind of protection against erosion bypass valve, including valve body and the bonnet on valve body, it is characterised in that also including valve seat, throttling
Set, main valve clack, equalizing valve valve and valve rod, the valve body are provided with valve inlet, valve export and valve pocket, and the valve seat is positioned at described
Main valve sealing pair is formed in valve pocket and with the main valve clack, the throat bushing is vertically installed in the valve pocket and upper and lower side is distinguished
Against the bonnet and the valve seat, the side wall upper part and lower sidewall of the throat bushing are respectively equipped with pre-admission through hole and master and entered
Vapour through hole, one end of the pre-admission through hole connect valve inlet by the valve pocket with the minim gap of the throttling inner room,
Valve pocket of the other end connection above main valve clack top surface stroke peak, one end of the main admission opening connect the valve and entered
Mouthful, the other end connects the valve pocket between the valve seat and main valve clack top surface stroke minimum point, and the main valve clack is provided with erosion control
Brush flange, the valve seat are provided with corresponding protection against erosion groove, the main valve clack be located inside the throat bushing and with the throttling
Set is slidably matched, and the center of the main valve clack is provided with the ladder hole of axial direction, the epimere of the ladder hole, stage casing and hypomere
Diameter is sequentially reduced, and the epimere of the ladder hole is slidably matched with the equalizing valve valve, and stage casing is built with disc spring, the ladder
Shoulder end face between the epimere of through hole and stage casing is provided with and can opened with the equalizing valve lobed into the pre- of equalizing valve sealing pair
Valve seat, the center through hole of the valve rod through the bonnet are stretched into the valve pocket, and the equalizing valve valve is arranged on the valve rod
Lower end.
2. protection against erosion bypass valve according to claim 1, it is characterised in that the throat bushing inside top is provided with annular tenon
Groove, the lateral wall of the tongue-and-groove at the top of the throat bushing are fitted close with the madial wall of the valve pocket, and the bonnet lower surface is provided with
Annular protrusion, the madial wall of the lateral wall of the annular protrusion and the tongue-and-groove at the top of the throat bushing are fitted close, the annular
Raised lower surface is resisted against on the bottom surface of the tongue-and-groove at the top of the throat bushing.
3. protection against erosion bypass valve according to claim 2, it is characterised in that the throat bushing bottom inside is provided with annular tenon
Groove, the madial wall of the tongue-and-groove of the throat bushing bottom are fitted close with the lateral wall of the valve seat, are resisted against at the top of the valve seat
On the bottom surface of the tongue-and-groove of the throat bushing bottom.
4. protection against erosion bypass valve according to claim 3, it is characterised in that the valve seat bottom is provided with the shaft shoulder, the valve seat
Annular groove is formed between the shaft shoulder of bottom and throat bushing bottom lower surface, if being filled with dry seal in the annular groove
Circle.
5. protection against erosion bypass valve according to claim 4, it is characterised in that the middle part of the valve body is in the curved surface of convex
Shape, the annular gap being consequently formed between the throat bushing lower outside face and the valve interior wall, the main via hole of inlet steam are
Circumferentially distributed multiple on same axial location, the outer end of each main via hole of inlet steam connects the annular gap.
6. protection against erosion bypass valve according to claim 5, it is characterised in that the equalizing valve sealing pair uses cone seal,
The equalizing valve valve is provided with the axially extending bore that some lower ports are located on the outside of equalizing valve sealing surface.
7. protection against erosion bypass valve according to claim 6, it is characterised in that the valve rod locks company with the equalizing valve valve
Connect, be provided with above the main valve clack and spacing locknut is carried out to the equalizing valve valve.
8. protection against erosion bypass valve according to claim 7, it is characterised in that the locknut passes through screw thread with the main valve clack
Connection, and fixed by end face spot welding.
9. protection against erosion bypass valve according to claim 8, it is characterised in that the upper outside of the main valve clack is provided with annular
Guide groove, the guide groove is interior to be provided with guide ring, and the guide ring external diameter is identical with the throat bushing internal diameter, the guiding
Some relief grooves are provided with below ring.
10. according to any protection against erosion bypass valves of claim 1-9, it is characterised in that it is recessed that the main valve clack bottom is provided with annular
Seam, the medial surface of the annular concave mouth are taper surface, and lateral surface is cylindroid, and the round and smooth connection of interior lateral surface, the ring
The Outboard Sections of shape concave mouth form annular erosion control flange, and the valve seat is provided with the convex annular being engaged with the annular concave mouth
Seam and the annular erosion control groove being engaged with the annular erosion control flange, medial surface and the annular of the annular concave mouth
The medial surface of male half coupling forms the main valve sealing pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720701360.3U CN206874825U (en) | 2017-06-16 | 2017-06-16 | Protection against erosion bypass valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720701360.3U CN206874825U (en) | 2017-06-16 | 2017-06-16 | Protection against erosion bypass valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206874825U true CN206874825U (en) | 2018-01-12 |
Family
ID=61333186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720701360.3U Active CN206874825U (en) | 2017-06-16 | 2017-06-16 | Protection against erosion bypass valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206874825U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274041A (en) * | 2019-07-22 | 2019-09-24 | 哈尔滨松林电站设备有限公司 | Double-sealing face valve seal pair, double-sealing face valve and the application as bypass valve |
| CN113236789A (en) * | 2021-04-30 | 2021-08-10 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
| CN113738882A (en) * | 2021-08-31 | 2021-12-03 | 中国船舶重工集团公司第七0三研究所 | Double-throttle regulating valve |
-
2017
- 2017-06-16 CN CN201720701360.3U patent/CN206874825U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274041A (en) * | 2019-07-22 | 2019-09-24 | 哈尔滨松林电站设备有限公司 | Double-sealing face valve seal pair, double-sealing face valve and the application as bypass valve |
| CN113236789A (en) * | 2021-04-30 | 2021-08-10 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
| CN113236789B (en) * | 2021-04-30 | 2022-12-27 | 华能海南发电股份有限公司东方电厂 | Prevent steam turbine governing valve rod structure that splits |
| CN113738882A (en) * | 2021-08-31 | 2021-12-03 | 中国船舶重工集团公司第七0三研究所 | Double-throttle regulating valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Bian Jiuhai Inventor after: Zhao Yan Inventor after: Yu Yanmin Inventor after: Dong Shengli Inventor after: Zhang Zaijiang Inventor after: Xu Wenbo Inventor before: Bian Jiuhai Inventor before: Zhao Yan Inventor before: Yu Yanmin Inventor before: Dong Shengli Inventor before: Zhang Zaijiang Inventor before: Xu Wenbo |
|
| CB03 | Change of inventor or designer information |