CN104454037A - Connecting structure for valve rod and crossed sleeve of turbine high-pressure main steam regulating valve - Google Patents
Connecting structure for valve rod and crossed sleeve of turbine high-pressure main steam regulating valve Download PDFInfo
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- CN104454037A CN104454037A CN201410574069.5A CN201410574069A CN104454037A CN 104454037 A CN104454037 A CN 104454037A CN 201410574069 A CN201410574069 A CN 201410574069A CN 104454037 A CN104454037 A CN 104454037A
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- valve rod
- valve
- briquetting
- swivel nut
- cross
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Abstract
The invention discloses a connecting structure for a valve rod and a crossed sleeve of a turbine high-pressure main steam regulating valve. The connecting structure comprises the valve rod and the crossed sleeve, wherein the valve rod and the crossed sleeve are coaxially arranged, and the crossed sleeve is arranged on the upper portion. A swivel nut is matched to be arranged on the upper section of the valve rod and is connected to the valve rod in a threaded mode, and the top face of the swivel nut is flush with the top face of the valve rod. A snap ring is arranged beneath the swivel nut and wraps the swivel nut from bottom to top, and the inner hole of the snap ring is a stepped hole. A big hole in the upper section of the stepped hole is matched with the swivel nut, a small hole in the lower section of the stepped hole is matched with the valve rod, and the matching surfaces are in sliding fit. The sliding fit surfaces of the snap ring and the valve rod are provided with an anti-rotation key, and the anti-rotation key can prevent the valve rod from rotating. The snap ring is fixedly connected with the crossed sleeve through bolts. According to the connecting structure for the valve rod and the crossed sleeve of the turbine high-pressure main steam regulating valve, on the premise that normal opening and closing of the valve are not affected, through a series of improvement, the cracking problem of an anti-rotating pin is solved, and the phenomenon that the valve rod is unevenly stressed in the quick closing process due to the mounting clearance of a gasket is also avoided. The connecting structure for the valve rod and the crossed sleeve of the turbine high-pressure main steam regulating valve is simple in structure, reliable in working, convenient to mount and capable of being widely applied to connecting various crossed sleeves and valve rods.
Description
Technical field
The present invention relates to turbine high-pressure main steam control valve, particularly relate to its valve rod and overlap with cross the structural design connected.
Background technique
Turbine high-pressure main steam control valve is the door that steam enters steam turbine, and its reliability is most important to unit operation safety, but the drive mechanism of existing high-pressure main steam regulating valve also exists some irrational places.At present widely used regulating valve rod and cross overlaps connecting structure as shown in Figure 1, and valve rod 6 top is provided with outside thread, cross cover 9(manipulation seat) bottom correspondence be provided with tapped hole, both pass through scyewed joint; Adjustment pad 10 is also provided with in tapped hole on cross cover 9.Valve rod 6 top is also provided with in the through hole of a level, this through hole and is inserted with stop pin 11, and cross overlaps in 9 tapped holes, corresponding stop pin 11 two ends are provided with positioning hole, and stop pin 11 is fixedly connected with cross cover 9 and valve rod 6, plays the effect preventing screw thread from threading off.
But when as installed, it is not in place thus there is gap that valve rod 6 and cross overlap the easy registration of thickness of pad 10 between 9, and at valve quick closing valve with when opening, on valve rod 6, the dynamic stress of carrying will be delivered on stop pin 11; Meanwhile, when valve working, suffered Steam excited force impact, the vibrations of valve rod 6 also can produce shearing force to stop pin 11.Therefore, the stop pin 11 through the valve rod 6 of septum valve often ruptures, and causes that valve rod 6 rotates, spool comes off, and makes valve invalidation, produces great potential safety hazard.
Summary of the invention
For overcoming the above problems, the invention provides a kind of brand-new valve rod and cross overlaps connecting structure, taking away the firewood under the cauldron, give up stop pin and pad, fundamentally solve that valve rod rotates, spool comes off problem.
The technical solution adopted in the present invention is:
A kind of turbine high-pressure main steam control valve valve rod and cross overlap connecting structure, comprise coaxially arranged valve rod, cross cover, and cross cover occupies; Be furnished with a swivel nut at the epimere of described valve rod, be screwed onto on valve rod, the end face of this swivel nut flushes with valve rod end face; Be provided with a snap ring in the below of swivel nut, from bottom to top caught by swivel nut, the endoporus of this snap ring is shoulder hole, and the epimere macropore of this shoulder hole and swivel nut match, and hypomere aperture and valve rod match, and fitting surface is and is slidably matched; Be slidably matched on face at snap ring and valve rod, be provided with antirotation keys, can prevent valve rod from rotating; Described snap ring is fixedly connected with cross cover by bolt, in valve opening process, the lifting force that valve actuator provides is transferred sequentially to valve rod through cross cover, bolt, snap ring, swivel nut, makes valve rod increase with cross cover is synchronous, band movable valve plug moves, by valve opening; In valve closing process, the lower thrust that valve actuator provides acts on the end face of swivel nut and valve rod through cross cover, be directly passed to valve rod, and valve rod is declined with cross cover is synchronous, and band movable valve plug moves down, by valve closing; During valve quick closing valve, quick closing valve impulsive load is passed to briquetting by cross cover, then is delivered to valve rod through briquetting.
On the end face of described valve rod, be also provided with a briquetting, there is counterbore at this briquetting center, has sunk screw in hole, and there is corresponding screw at valve rod end face center, and briquetting is fixed on valve rod end face by sunk screw; Thickness and the shaft length sum of this briquetting are the effective length of valve rod, select the briquetting of different-thickness, the effective length of adjustable valve rod, to meet the requirement of cross sleeve spring precompressed amount, during valve quick closing valve, quick closing valve impulsive load is passed to briquetting by cross cover, then is delivered to valve rod through briquetting.
The registration gap that described briquetting end face and cross overlap between bottom surface is less than 0.02mm, close contacting fit between briquetting 2 bottom surface and valve rod 6 end face.
The beneficial effect that the present invention produces is:
Turbine high-pressure main steam control valve valve rod of the present invention and cross overlap connecting structure, do not affecting under the prerequisite that valve normally opens and closes, by a series of improvement, both solved the problem of stop pin fracture, valve rod discontinuity equalization when turn avoid the quick closing valve caused because of pad assemblage gap.Structure of the present invention is simple, reliable operation, easy for installation, the connection of various cross cover and valve rod can be widely used in.
Accompanying drawing explanation
Fig. 1 is that existing turbine high-pressure main steam control valve valve rod and cross overlap connection diagram
Fig. 2 is that turbine high-pressure main steam control valve valve rod of the present invention and cross overlap connection diagram
Number in the figure represents: 1-sunk screw, 2-briquetting, 3-swivel nut, 4-snap ring, 5-antirotation keys, 6-valve rod, 7-nut, 8-bolt, 9-cross cover, 10-pad, 11-stop pin.
Embodiment
See Fig. 2, the present invention is that a kind of turbine high-pressure main steam control valve valve rod and cross overlap connecting structure, and comprise coaxially arranged valve rod 6 and cross cover 9, cross cover 9 occupies.
Innovative design of the present invention is: compared with original structure, eliminates place where troops were originally stationed and ships and resell on another market 11, changes into and adopts the effect that antirotation keys 5 acts on valve rod 6, realization prevents screw thread from threading off.Concrete: be furnished with a swivel nut 3 at the epimere of this valve rod 6, be screwed onto on valve rod 6, the end face of swivel nut 3 flushes with valve rod 6 end face.Be provided with a snap ring 4 in the below of swivel nut 3, from bottom to top caught by swivel nut 3, the endoporus of this snap ring 4 is shoulder holes, and epimere macropore and the swivel nut 3 of this shoulder hole match, and hypomere aperture and valve rod 6 match, and fitting surface is for being slidably matched.Be slidably matched on face at snap ring 4 and valve rod 6, be provided with antirotation keys 5, can prevent valve rod 6 from rotating.Snap ring 4 overlaps 9 by bolt 8 and cross and is fixedly connected with.
In valve opening process, the lifting force that valve actuator provides is transferred sequentially to valve rod 6 through cross cover 9, bolt 8, snap ring 4, swivel nut 3, makes valve rod 6 synchronously increase with cross cover 9, band movable valve plug moves, by valve opening; In valve closing process, the lower thrust that valve actuator provides acts on the end face of swivel nut 3 and valve rod 6 through cross cover 9, is directly passed to valve rod 6, and valve rod 6 is synchronously declined with cross cover 9, and band movable valve plug moves down, by valve closing.
Further, overlapping the requirement of 9 inner spring precompressed amounts for meeting cross, on the end face of valve rod 6, being also provided with a briquetting 2.This briquetting 2 center has in counterbore, counterbore and is provided with sunk screw 1, and valve rod 6 end face center is provided with corresponding screw, and briquetting 2 is fixed on valve rod 6 end face by sunk screw 1.The thickness of this briquetting 2 and valve rod 6 length sum are the effective length of valve rod 6; Therefore, select the briquetting 2 of different-thickness, the effective length of adjustable valve rod 6, to meet the requirement that cross overlaps 9 spring precompressed amounts.During valve quick closing valve, quick closing valve impulsive load is overlapped 9 by cross and is passed to briquetting 2, then is delivered to valve rod 6 through briquetting 2.
The registration gap that briquetting 2 end face and cross overlap between 9 bottom surfaces is less than 0.02mm, generally allows within the scope of 0 ~ 0.02mm.Compress between briquetting 2 bottom surface and valve rod 6 end face, close contacting fit, there is not gap.
To turbine high-pressure main steam control valve valve rod of the present invention and cross overlap connecting structure assemble time, first, according to said structure processing cross cover 9 with valve rod 6, and according to measured value registration adjustment briquetting 2.Then, swivel nut 3 is screwed into valve rod 6, ensures the end face of swivel nut 3 upper-end surface and valve rod 6; And compressed by briquetting 2, prevent screw thread from getting loose.Re-using sunk screw 1 is tightened on valve rod 6 by briquetting 2, adjustment briquetting 2 and swivel nut 3 is fixed.Finally, snap ring 4 and swivel nut 3 hold out against, registration briquetting 2 and cross overlap gap between 9, and install antirotation keys 5 also by jack panel 7 and bolt 8, snap ring 4 and cross overlap 9 and be connected and fixed.
During valve opening, lifting force is passed to connecting bolt 8 by cross cover 9, then is passed on valve rod 6 by snap ring 4, swivel nut 3, then briquetting 2 and sunk screw 1 do not stress; During valve quick closing valve, quick closing valve impulsive load is overlapped 9 by cross and is passed to briquetting 2, then is delivered to valve rod 6, then sunk screw 1 does not stress.Design like this, makes valve in the process opened and closed, does not have part and there is phenomenon of rupture.
Claims (3)
1. turbine high-pressure main steam control valve valve rod and cross overlap a connecting structure, comprise coaxially arranged valve rod, cross cover, and cross cover occupies; It is characterized in that being furnished with a swivel nut at the epimere of described valve rod, being screwed onto on valve rod, the end face of this swivel nut flushes with valve rod end face; Be provided with a snap ring in the below of swivel nut, from bottom to top caught by swivel nut, the endoporus of this snap ring is shoulder hole, and the epimere macropore of this shoulder hole and swivel nut match, and hypomere aperture and valve rod match, and fitting surface is and is slidably matched; Be slidably matched on face at snap ring and valve rod, be provided with antirotation keys, can prevent valve rod from rotating; Described snap ring is fixedly connected with cross cover by bolt, in valve opening process, the lifting force that valve actuator provides is transferred sequentially to valve rod through cross cover, bolt, snap ring, swivel nut, makes valve rod increase with cross cover is synchronous, band movable valve plug moves, by valve opening; In valve closing process, the lower thrust that valve actuator provides acts on the end face of swivel nut and valve rod through cross cover, be directly passed to valve rod, and valve rod is declined with cross cover is synchronous, and band movable valve plug moves down, by valve closing; During valve quick closing valve, quick closing valve impulsive load is passed to briquetting by cross cover, then is delivered to valve rod through briquetting.
2. turbine high-pressure main steam control valve valve rod as claimed in claim 1 and cross overlap connecting structure, it is characterized in that, on the end face of described valve rod, also be provided with a briquetting, there is counterbore at this briquetting center, have sunk screw in hole, there is corresponding screw at valve rod end face center, and briquetting is fixed on valve rod end face by sunk screw; Thickness and the shaft length sum of this briquetting are the effective length of valve rod, select the briquetting of different-thickness, the effective length of adjustable valve rod, to meet the requirement of cross sleeve spring precompressed amount, during valve quick closing valve, quick closing valve impulsive load is passed to briquetting by cross cover, then is delivered to valve rod through briquetting.
3. turbine high-pressure main steam control valve valve rod as claimed in claim 1 and cross overlap connecting structure, and it is characterized in that, the registration gap that described briquetting end face and cross overlap between bottom surface is less than 0.02mm, close contacting fit between briquetting 2 bottom surface and valve rod 6 end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574069.5A CN104454037B (en) | 2014-10-24 | 2014-10-24 | Turbine high-pressure main steam control valve valve rod and cross overlap connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574069.5A CN104454037B (en) | 2014-10-24 | 2014-10-24 | Turbine high-pressure main steam control valve valve rod and cross overlap connecting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454037A true CN104454037A (en) | 2015-03-25 |
| CN104454037B CN104454037B (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410574069.5A Active CN104454037B (en) | 2014-10-24 | 2014-10-24 | Turbine high-pressure main steam control valve valve rod and cross overlap connecting structure |
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| CN (1) | CN104454037B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107061862A (en) * | 2017-06-01 | 2017-08-18 | 东方电气集团东方汽轮机有限公司 | A kind of valve crosshead connecting structure |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2583818A3 (en) * | 1985-06-25 | 1986-12-26 | Proizv Ob | Valve device for steam turbine |
| JPH0412101A (en) * | 1990-04-27 | 1992-01-16 | Toshiba Corp | Governing valve |
| CN2191282Y (en) * | 1994-02-04 | 1995-03-08 | 辽源电力科技开发公司 | Turn-stop wear-proof device |
| JP2002097903A (en) * | 2000-09-27 | 2002-04-05 | Mitsubishi Heavy Ind Ltd | Steam valve |
| CN1488840A (en) * | 2002-09-04 | 2004-04-14 | ͨ�õ�����˾ | Combined stop-control valve for supplying steam |
| CN1719003A (en) * | 2004-07-07 | 2006-01-11 | 株式会社东芝 | Main steam valve for a steam turbine |
| CN202220625U (en) * | 2011-08-09 | 2012-05-16 | 中电华元核电工程技术有限公司 | Connection mechanism for high and medium pressure valve of nuclear power plant turbine |
| CN203702268U (en) * | 2014-03-12 | 2014-07-09 | 南京汽轮电机(集团)有限责任公司 | Regulating valve provided with locking devices |
| CN203769864U (en) * | 2014-04-11 | 2014-08-13 | 温州市开诚机械有限公司 | Novel high-pressure adjustment valve of steam turbine |
-
2014
- 2014-10-24 CN CN201410574069.5A patent/CN104454037B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2583818A3 (en) * | 1985-06-25 | 1986-12-26 | Proizv Ob | Valve device for steam turbine |
| JPH0412101A (en) * | 1990-04-27 | 1992-01-16 | Toshiba Corp | Governing valve |
| CN2191282Y (en) * | 1994-02-04 | 1995-03-08 | 辽源电力科技开发公司 | Turn-stop wear-proof device |
| JP2002097903A (en) * | 2000-09-27 | 2002-04-05 | Mitsubishi Heavy Ind Ltd | Steam valve |
| CN1488840A (en) * | 2002-09-04 | 2004-04-14 | ͨ�õ�����˾ | Combined stop-control valve for supplying steam |
| CN1719003A (en) * | 2004-07-07 | 2006-01-11 | 株式会社东芝 | Main steam valve for a steam turbine |
| CN202220625U (en) * | 2011-08-09 | 2012-05-16 | 中电华元核电工程技术有限公司 | Connection mechanism for high and medium pressure valve of nuclear power plant turbine |
| CN203702268U (en) * | 2014-03-12 | 2014-07-09 | 南京汽轮电机(集团)有限责任公司 | Regulating valve provided with locking devices |
| CN203769864U (en) * | 2014-04-11 | 2014-08-13 | 温州市开诚机械有限公司 | Novel high-pressure adjustment valve of steam turbine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107061862A (en) * | 2017-06-01 | 2017-08-18 | 东方电气集团东方汽轮机有限公司 | A kind of valve crosshead connecting structure |
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| Publication number | Publication date |
|---|---|
| CN104454037B (en) | 2016-04-20 |
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