CN114483217A - Automatic main valve rod disassembly and maintenance method for steam turbine with pre-opening valve - Google Patents
Automatic main valve rod disassembly and maintenance method for steam turbine with pre-opening valve Download PDFInfo
- Publication number
- CN114483217A CN114483217A CN202210022599.3A CN202210022599A CN114483217A CN 114483217 A CN114483217 A CN 114483217A CN 202210022599 A CN202210022599 A CN 202210022599A CN 114483217 A CN114483217 A CN 114483217A
- Authority
- CN
- China
- Prior art keywords
- valve
- valve rod
- opening
- steam turbine
- rod
- 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.)
- Pending
Links
- 238000012423 maintenance Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000010687 lubricating oil Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract 2
- 239000003818 cinder Substances 0.000 description 9
- 230000005484 gravity Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
-
- 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
- F01D25/18—Lubricating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/80—Repairing, retrofitting or upgrading methods
Abstract
The invention provides a method for disassembling and overhauling a valve rod of an automatic main valve of a steam turbine with a pre-opening valve, which is characterized in that a thread is arranged at the contact part of the outer surface of the valve rod of the pre-opening valve and the inner surface of a through hole of a valve disc in advance; during disassembly and maintenance, the jamming is eliminated by knocking or rotating the valve rod. The surface of the valve rod of the pre-opening valve is processed into trapezoidal threads with the thread pitch of 3mm, and the gap between the valve rod of the pre-opening valve and the valve butterfly is kept unchanged during installation. During emergency repair, the valve can be detached firstly, the oxide skin is led out to form a gap in a mode of a screw conveyor by rotating the valve rod, and meanwhile, lubricating oil and loose liquid at the top end are input and directly reach the clamping position through threads.
Description
Technical Field
The invention relates to a disassembly and maintenance method for an automatic main valve rod of a steam turbine with a pre-opening valve.
Background
The main throttle valve of the steam turbine is generally horizontally installed, the requirement on the concentricity of a valve rod and a valve butterfly is high, the stroke of the pre-opening valve is 18mm, and the designed value of the radial clearance is 0.30 mm.
At present, a valve rod of the pre-opening valve is thinned, a gap between the valve rod of the pre-opening valve and a valve butterfly is increased, and the valve rod is disassembled for maintenance when reaching an A-level maintenance period. Namely, the storage space of the oxide skin is increased, and the time for generating the jamming is prolonged. However, the valve is horizontally installed and is influenced by gravity, a valve rod is heated and necessarily bends down during operation, the closing contact line of a valve core of the pre-opening valve and a valve butterfly is influenced, and the valve is not closed tightly.
Therefore, how to solve the problem of eliminating the jamming in disassembly and maintenance is an important measure.
Disclosure of Invention
The application provides a method for disassembling and overhauling an automatic main valve rod of a steam turbine with a pre-opening valve. The contact area between the valve rod of the pre-opening valve and the valve butterfly is reduced, and jamming is eliminated. Or in the case of jamming, the jamming may be eliminated by knocking or rotating the valve stem.
A steam turbine takes the automatic main valve stem disintegration of the pre-opened valve to overhaul the method, will pre-open the valve stem outer surface of valve and valve disc through hole inner surface contact position set up the whorl in advance, in order to reduce the contact area, reduce the resistance; the scale cinder which falls off when the valve rod moves is collected into the thread, so that the scale cinder which falls off is prevented from being stacked and filled in gaps when the scale cinder is lifted or falls off along with the valve rod, and the resistance is increased; during disassembly and maintenance, the jamming is eliminated by knocking or rotating the valve rod.
Further, the valve rod of the valve is pre-opened, and the surface of the valve rod is processed into a trapezoidal thread with the thread pitch of 3 mm. The clearance between the valve rod of the pre-opening valve and the valve butterfly is kept unchanged, the concentricity of the valve rod and the valve butterfly can be still kept after the valve rod is heated, and the valve rod and the valve butterfly can be closed tightly.
Furthermore, during emergency repair, the valve can be detached firstly, the oxide skin is led out in a mode of a screw conveyor to form a gap by rotating the valve rod, and meanwhile lubricating oil and loose liquid at the top end are input and directly reach the clamping position through threads.
The invention does not change the original valve structure, only performs trapezoidal thread processing on the surface of the valve rod of the pre-opened valve, reduces the contact area and reduces the resistance; the scale cinder which falls off when the valve rod moves is collected into the thread, so that the scale cinder which falls off is prevented from being stacked and filled in gaps when the scale cinder is lifted or falls off along with the valve rod, and the resistance is increased; when urgent repair is carried out, the valve can be firstly disassembled, the oxide skin is led out to form a gap in a mode of a screw conveyor by rotating the valve rod, and meanwhile, lubricating oil and loose liquid at the top end can be input to the directly-reaching jamming position through threads.
Detailed Description
In the application, the automatic main valve rod disassembly maintenance method for the steam turbine with the pre-opening valve is characterized in that threads, specifically trapezoidal threads with the thread pitch of 3mm, are arranged at the contact part of the outer surface of the valve rod of the pre-opening valve and the inner surface of the through hole of a valve disc in advance, so that the gap between the valve rod of the pre-opening valve and a valve butterfly is kept unchanged, the concentricity of the valve rod and the valve butterfly can be still kept after the valve rod is heated, and the valve rod and the valve butterfly can be closed tightly. So as to reduce the contact area and reduce the resistance; the scale cinder which falls off when the valve rod moves is collected into the thread, so that the scale cinder which falls off is prevented from being stacked and filled in gaps when the scale cinder is lifted or falls off along with the valve rod, and the resistance is increased; during disassembly and maintenance, the jamming is eliminated by knocking or rotating the valve rod.
During emergency repair, the valve can be detached firstly, the oxide skin is led out to form a gap in a mode of a screw conveyor by rotating the valve rod, and meanwhile, lubricating oil and loose liquid at the top end are input and directly reach the clamping position through threads.
Claims (3)
1. A steam turbine with a pre-opened valve for automatic main valve rod disassembly maintenance method, the contact part of the outer surface of the valve rod of the pre-opened valve and the inner surface of the through hole of a valve disc is provided with threads in advance; during disassembly and maintenance, the jamming is eliminated by knocking or rotating the valve rod.
2. The method for disassembling and overhauling the valve rod of the automatic main valve of the steam turbine with the pre-opening valve is characterized in that the surface of the valve rod of the pre-opening valve is processed into a trapezoidal thread with the thread pitch of 3mm, and a gap between the valve rod of the pre-opening valve and a valve butterfly is kept unchanged during installation.
3. The method for disassembling and overhauling the valve rod of the automatic main valve of the steam turbine with the pre-starting valve according to claim 1, is characterized in that in emergency repair, the valve is not disassembled, the valve rod is rotated, the oxide skin is led out in a screw conveyor mode to form a gap, and meanwhile, lubricating oil and loose liquid at the top end are input and directly reach the jammed part through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022599.3A CN114483217A (en) | 2022-01-10 | 2022-01-10 | Automatic main valve rod disassembly and maintenance method for steam turbine with pre-opening valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022599.3A CN114483217A (en) | 2022-01-10 | 2022-01-10 | Automatic main valve rod disassembly and maintenance method for steam turbine with pre-opening valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114483217A true CN114483217A (en) | 2022-05-13 |
Family
ID=81510829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210022599.3A Pending CN114483217A (en) | 2022-01-10 | 2022-01-10 | Automatic main valve rod disassembly and maintenance method for steam turbine with pre-opening valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114483217A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368758A (en) * | 1979-09-25 | 1983-01-18 | Siemens Aktiengesellschaft | Device for controlling a steam or gas turbine |
| CN201090748Y (en) * | 2007-08-31 | 2008-07-23 | 成都阿特米控制阀仪表有限公司 | Control valve for automatically adjusting center |
| CN101285405A (en) * | 2008-06-03 | 2008-10-15 | 东方电气集团东方汽轮机有限公司 | Steam turbine steam extraction regulation valve |
| US7975984B1 (en) * | 2008-08-08 | 2011-07-12 | Samir Novruzov | Packingless hermetic valve with harmonic drive |
| CN203717980U (en) * | 2014-01-03 | 2014-07-16 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure main steam regulating valve |
| CN104033615A (en) * | 2014-05-21 | 2014-09-10 | 杭州中能汽轮动力有限公司 | Double-seat throttling guide type governing steam valve |
| CN204201136U (en) * | 2014-10-13 | 2015-03-11 | 大唐黄岛发电有限责任公司 | A kind of improved 670MW unit height row ventilation valve |
| CN206816308U (en) * | 2017-04-17 | 2017-12-29 | 无锡富起电力设备配件有限公司 | A kind of turbine high-pressure main inlet throttle-stop valve |
-
2022
- 2022-01-10 CN CN202210022599.3A patent/CN114483217A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368758A (en) * | 1979-09-25 | 1983-01-18 | Siemens Aktiengesellschaft | Device for controlling a steam or gas turbine |
| CN201090748Y (en) * | 2007-08-31 | 2008-07-23 | 成都阿特米控制阀仪表有限公司 | Control valve for automatically adjusting center |
| CN101285405A (en) * | 2008-06-03 | 2008-10-15 | 东方电气集团东方汽轮机有限公司 | Steam turbine steam extraction regulation valve |
| US7975984B1 (en) * | 2008-08-08 | 2011-07-12 | Samir Novruzov | Packingless hermetic valve with harmonic drive |
| CN203717980U (en) * | 2014-01-03 | 2014-07-16 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure main steam regulating valve |
| CN104033615A (en) * | 2014-05-21 | 2014-09-10 | 杭州中能汽轮动力有限公司 | Double-seat throttling guide type governing steam valve |
| CN204201136U (en) * | 2014-10-13 | 2015-03-11 | 大唐黄岛发电有限责任公司 | A kind of improved 670MW unit height row ventilation valve |
| CN206816308U (en) * | 2017-04-17 | 2017-12-29 | 无锡富起电力设备配件有限公司 | A kind of turbine high-pressure main inlet throttle-stop valve |
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| PB01 | Publication | ||
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