CN104942528A - Method for disassembling threaded ring of main steam valve - Google Patents
Method for disassembling threaded ring of main steam valve Download PDFInfo
- Publication number
- CN104942528A CN104942528A CN201510210319.1A CN201510210319A CN104942528A CN 104942528 A CN104942528 A CN 104942528A CN 201510210319 A CN201510210319 A CN 201510210319A CN 104942528 A CN104942528 A CN 104942528A
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- CN
- China
- Prior art keywords
- threaded collar
- threaded ring
- wall
- main steam
- temperature
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a method for disassembling a threaded ring of a main steam valve. The method includes the steps of firstly, laying a heating device on the outer surface of a valve shell, and uniformly and circumferentially arranging a plurality of temperature measuring elements on the outer wall of the valve shell and under the heating device; secondly, placing refrigerating articles in an inner cavity of the threaded ring uniformly, and arranging a plurality of temperature measuring elements on the outer wall of the threaded ring uniformly; thirdly, assembling a special disassembling tool for the threaded ring at a disassembling port in the sidewall of the threaded ring, wherein a stress applying rod is fixed above the special disassembling tool, and the upper end of the stress applying rod is suspended on a lifting tool of a travelling crane; fourthly, when the measured temperature of the outer wall of the valve shell is 1-10 DEG C higher than that of the outer wall of the threaded ring, using a knocking device to strike the stress applying rod until the threaded ring is loose, and then using the special disassembling tool to disassemble the threaded ring. The method for disassembling the threaded ring of the main steam valve has the advantages that the cold shrinkage and thermal expansion theory is adopted to enable a valve body to expand and the threaded ring to shrink, disassembling quality is guaranteed, maintenance cost is reduced, and working efficiency is improved.
Description
Technical field
The present invention relates to a kind of fired power generating unit high temperature valve, be specifically related to the method for dismounting of main steam valve threaded collar in a kind of fired power generating unit high temperature valve.
Background technology
In order to improve energy utilization rate; supercritical turbine becomes main force's type gradually China is huge; supercritical turbine main steam associating valve is the connection device between main steam line and steam turbine; receive the high temperature and high pressure steam come from boiler; control the power of the assembling unit; stablize turbine speed, and in case of emergency quick closedown protection unit, be typical important high-temperature component.The main air valve of steam turbine is that main steam is left boiler and entered steam turbine work first and close, and can be changed the steam flow entering steam turbine by control valve, and then changes it and exert oneself or rotating speed, to adapt to the needs of different operating mode.The main steam valve of steam turbine adopts dual-valve cover structure, and interior valve gap is fixed by major thread ring, and valve rod gas leakage accesses interlayer between outer valve gap.
Need to dismantle main steam valve in the process of maintenance valve, but due to air-tightness needs, between threaded collar and valve casing inwall, usual pretightning force is very large, high temperature can make threaded collar expand thus increase pretightning force simultaneously, and therefore dismounting threaded collar effort is time-consuming.
Summary of the invention
For solving the problem, the invention provides a kind of method for dismounting of main steam valve threaded collar, can easy removal threaded collar, increase work efficiency.
Technical scheme adopted to achieve these goals: described method comprises, the first step, lays heater at the outer surface of valve casing, and at valve casing outer wall and under heater, circumference evenly arranges some temperature elements;
Second step, evenly put into refrigerated product in the inner cavity chamber of threaded collar, and some temperature elements are evenly set on the outer wall of threaded collar;
3rd step, be arranged on the dismounting mouth of threaded collar sidewall by threaded collar removal tool special, the top of removal tool special is fixed with boosting-rod, and the upper end of described boosting-rod is suspended on driving suspender;
4th step, when the temperature 1 DEG C ~ 10 DEG C of the temperature of valve casing outer wall higher than threaded collar outer wall being detected, knocking device is utilized to hit boosting-rod, until after threaded collar loosens, utilize removal tool special threaded collar to be pulled down.
Described heater is electric heating sheets, and electric heating sheets uniform spreading is located at the outer surface of valve casing, and is isolated from the outside with heat-insulation layer is coated.
Refrigerated product is dry ice, after the inner cavity chamber of threaded collar puts into dry ice, then lays insulating layer and baffle plate.
The length of described boosting-rod is 2m, 0.5 ~ 1m bottom the impact position distance boosting-rod of knocking device.
Control the heating-up temperature of heater, make the temperature on valve casing surface maintain 60 DEG C ~ 200 DEG C.
Temperature element on valve casing outer wall is 1 ~ 8; Temperature element on threaded collar outer wall is 1 ~ 8.
Because the principle of expanding with heat and contract with cold makes valve body expand, threaded collar tightens, and reduces pretightning force therebetween; Temperature element can measure the temperature difference between threaded collar and valve casing accurately, then the basis ensureing neither to destroy original modular construction makes gap therebetween increase; The length of boosting-rod is longer, increases moment, ensures that the impact of effective degree can loosen threaded collar smoothly, improves operating efficiency; Because the length of boosting-rod is longer, suspended in midair by the suspender of boosting-rod upper end, effectively carry out safeguard protection.
Accompanying drawing explanation
The position view of Fig. 1 main steam valve threaded collar;
Fig. 2 is the dismounting schematic diagram of main steam valve threaded collar;
Fig. 3 is the partial enlarged view at A place in Fig. 2.
In figure: 1, valve casing; 2, threaded collar; 3, dry ice; 4, insulating layer; 5, baffle plate; 6, removal tool special; 7, heat-insulation layer; 8, clip; 9, electric heating sheets; 10, boosting-rod; 11, knocking device.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As depicted in figs. 1 and 2, a kind of method for dismounting of main steam valve threaded collar, comprises the following steps:
The first step, lay heater at the outer surface of valve casing 1, and at valve casing outer wall and under heater, circumference evenly arranges some temperature elements;
Second step, evenly put into refrigerated product in the inner cavity chamber of threaded collar 2, and some temperature elements are evenly set on the outer wall of threaded collar;
3rd step, be arranged on the dismounting mouth of threaded collar sidewall by threaded collar removal tool special 6, the top of removal tool special is fixed with boosting-rod 10, and the upper end of described boosting-rod is suspended on driving suspender;
4th step, when the temperature 1 DEG C ~ 10 DEG C of the temperature of valve casing outer wall higher than threaded collar outer wall being detected, knocking device 11 is utilized to hit boosting-rod, until after threaded collar 2 loosens, utilize removal tool special 6 threaded collar to be pulled down.
Because the principle of expanding with heat and contract with cold makes valve body expand, threaded collar tightens, and reduces pretightning force therebetween; Temperature element can measure the temperature difference between threaded collar and valve casing accurately, then the basis ensureing neither to destroy original modular construction makes gap therebetween increase.
As shown in Figures 2 and 3, described heater is electric heating sheets 9, and electric heating sheets 9 uniform spreading is located at the outer surface of valve casing 1, and is isolated from the outside with heat-insulation layer 7 is coated.Electric heating sheets 9 and valve casing 1 outer wall are fitted tightly when installation, heated object surface area ensures smooth complete; Described heat-insulation layer 7 adopts flexibility insulation material and utilizes clip 8 to be fixed on the outer surface of electric heating sheets.
Refrigerated product is dry ice 3, after the inner cavity chamber of threaded collar 2 puts into dry ice 3, then lays insulating layer 4 and baffle plate 5.Dry ice 3 refrigerating capacity is sufficient and the duration is of a specified duration, and becoming gas after dry ice sublimation can not remain in threaded collar, affects the inwall top layer of threaded collar.
The length of described boosting-rod 10 is 2m, 0.5 ~ 1m bottom the impact position distance boosting-rod of knocking device 11.The length of boosting-rod 10 is longer, increases moment, ensures that the impact of effective degree can loosen threaded collar 2 smoothly, improves operating efficiency; Because the length of boosting-rod 10 is longer, suspended in midair by the suspender of boosting-rod upper end, effectively carry out safeguard protection.
Control the heating-up temperature of heater, make the temperature on valve casing surface maintain 60 DEG C ~ 200 DEG C.
Known by the relation of accounting temperature and material deformation, when the temperature difference of threaded collar and valve casing reaches more than 1 DEG C, therebetween gap becomes large pretightning force and reduces, the instrument that knocks is utilized to coordinate the extracting tool of Wrench-type threaded collar to be disassembled rapidly, and original mechanism of threaded collar and valve body can not be destroyed, reduce the cost of overhaul, decrease the fault rate of the rear equipment of screw thread loopback dress.
Temperature element on valve casing outer wall is 1 ~ 8; Temperature element on threaded collar outer wall is 1 ~ 8.Temperature element is connected with the computer in control room, can know the temperature of monitoring valve body and threaded collar intuitively, is convenient to control.
The present invention utilizes the principle of expanding with heat and contract with cold that valve body is expanded, and threaded collar tightens, and reduces pretightning force therebetween; Overcome the defect of threaded collar in tradition dismounting high temperature valve body, ensure dismounting quality, reduce the cost of overhaul, improve operating efficiency.
Claims (6)
1. a method for dismounting for main steam valve threaded collar, is characterized in that, comprises the following steps:
The first step, lay heater at the outer surface of valve casing, and at valve casing outer wall and under heater, circumference evenly arranges some temperature elements;
Second step, evenly put into refrigerated product in the inner cavity chamber of threaded collar, and some temperature elements are evenly set on the outer wall of threaded collar;
3rd step, be arranged on the dismounting mouth of threaded collar sidewall by threaded collar removal tool special, the top of removal tool special is fixed with boosting-rod, and the upper end of described boosting-rod is suspended on driving suspender;
4th step, when the temperature 1 DEG C ~ 10 DEG C of the temperature of valve casing outer wall higher than threaded collar outer wall being detected, knocking device is utilized to hit boosting-rod, until after threaded collar loosens, utilize removal tool special threaded collar to be pulled down.
2. the method for dismounting of main steam valve threaded collar as claimed in claim 1, it is characterized in that, described heater is electric heating sheets, and electric heating sheets uniform spreading is located at the outer surface of valve casing, and is isolated from the outside with heat-insulation layer is coated.
3. the method for dismounting of main steam valve threaded collar as claimed in claim 1, it is characterized in that, refrigerated product is dry ice, after the inner cavity chamber of threaded collar puts into dry ice, then lays insulating layer and baffle plate.
4. the method for dismounting of the main steam valve threaded collar as described in claim as arbitrary in claims 1 to 3, is characterized in that, the length of described boosting-rod is 2m, 0.5 ~ 1m bottom the impact position distance boosting-rod of knocking device.
5. the method for dismounting of main steam valve threaded collar as claimed in claim 4, is characterized in that, controls the heating-up temperature of heater, makes the temperature on valve casing surface maintain 60 DEG C ~ 200 DEG C.
6. the method for dismounting of main steam valve threaded collar as claimed in claim 5, it is characterized in that, the temperature element on valve casing outer wall is 1 ~ 8; Temperature element on threaded collar outer wall is 1 ~ 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210319.1A CN104942528A (en) | 2015-04-28 | 2015-04-28 | Method for disassembling threaded ring of main steam valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210319.1A CN104942528A (en) | 2015-04-28 | 2015-04-28 | Method for disassembling threaded ring of main steam valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104942528A true CN104942528A (en) | 2015-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510210319.1A Pending CN104942528A (en) | 2015-04-28 | 2015-04-28 | Method for disassembling threaded ring of main steam valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104942528A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986446A (en) * | 2022-08-03 | 2022-09-02 | 中国能源建设集团山西电力建设有限公司 | Method for disassembling high-pressure main steam valve compression ring on high-pressure cylinder of steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102010003574A1 (en) * | 2010-03-31 | 2011-10-06 | Schwäbische Hüttenwerke Automotive GmbH | Press composite for use as component of pump utilized to supply e.g. lubrication oil to combustion engine of motor car, has mixtures arranged in respective surfaces of joining parts, and containing hard material particle in carrier mass |
| CN103084783A (en) * | 2013-01-22 | 2013-05-08 | 国电联合动力技术有限公司 | Disassembling method of wind turbine generator system main bearing with shaft sleeve |
| CN202985006U (en) * | 2012-12-07 | 2013-06-12 | 益和电气集团股份有限公司 | Threaded connection dismounting device for copper-aluminum component |
| CN104308453A (en) * | 2014-11-12 | 2015-01-28 | 无锡亚中智能装备有限公司 | Heating press-fit device |
| CN204248330U (en) * | 2014-11-26 | 2015-04-08 | 广西电网有限责任公司贺州供电局 | High frequency screw dismounting heater |
| CA2600171C (en) * | 2006-09-28 | 2015-10-20 | Pratt & Whitney Canada Corp. | Labyrinth seal repair |
-
2015
- 2015-04-28 CN CN201510210319.1A patent/CN104942528A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2600171C (en) * | 2006-09-28 | 2015-10-20 | Pratt & Whitney Canada Corp. | Labyrinth seal repair |
| DE102010003574A1 (en) * | 2010-03-31 | 2011-10-06 | Schwäbische Hüttenwerke Automotive GmbH | Press composite for use as component of pump utilized to supply e.g. lubrication oil to combustion engine of motor car, has mixtures arranged in respective surfaces of joining parts, and containing hard material particle in carrier mass |
| CN202985006U (en) * | 2012-12-07 | 2013-06-12 | 益和电气集团股份有限公司 | Threaded connection dismounting device for copper-aluminum component |
| CN103084783A (en) * | 2013-01-22 | 2013-05-08 | 国电联合动力技术有限公司 | Disassembling method of wind turbine generator system main bearing with shaft sleeve |
| CN104308453A (en) * | 2014-11-12 | 2015-01-28 | 无锡亚中智能装备有限公司 | Heating press-fit device |
| CN204248330U (en) * | 2014-11-26 | 2015-04-08 | 广西电网有限责任公司贺州供电局 | High frequency screw dismounting heater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986446A (en) * | 2022-08-03 | 2022-09-02 | 中国能源建设集团山西电力建设有限公司 | Method for disassembling high-pressure main steam valve compression ring on high-pressure cylinder of steam turbine |
| CN114986446B (en) * | 2022-08-03 | 2022-10-25 | 中国能源建设集团山西电力建设有限公司 | Method for disassembling high-pressure main steam valve compression ring on high-pressure cylinder of steam turbine |
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| PB01 | Publication | ||
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Application publication date: 20150930 |