CN111075517A - Fastening device for steam valve of steam turbine - Google Patents
Fastening device for steam valve of steam turbine Download PDFInfo
- Publication number
- CN111075517A CN111075517A CN201911357690.5A CN201911357690A CN111075517A CN 111075517 A CN111075517 A CN 111075517A CN 201911357690 A CN201911357690 A CN 201911357690A CN 111075517 A CN111075517 A CN 111075517A
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- Prior art keywords
- steam
- valve
- lower flange
- fastening device
- steam turbine
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Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008439 repair process Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a fastening device of a steam valve of a steam turbine, which comprises an upper flange, a lower flange and a connecting bolt, wherein the upper flange is configured to press a valve cover, the lower flange is configured to hoop a valve body, and the connecting bolt is configured to be used for connecting and fastening the upper flange and the lower flange. A support is arranged between the lower flange and the valve body, and a support fixing ring is configured on the support. And a reinforcing and fixing mechanism is arranged on the side part of the lower flange. And a support bolt is arranged on the outer side of the connecting bolt, and two ends of the support bolt are connected with the upper flange and the lower flange through nuts. The fastening device can delay or even prevent the crack or even fracture of the valve cover bolt, improve the operation safety and reliability of the steam valve cover, reduce the shutdown emergency repair times and reduce the production and operation cost of the steam turbine set.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a fastening device for a steam valve of a steam turbine.
Background
In the technical field of power generation with water vapor as a working medium, a steam turbine is one of key devices, and the safe, efficient and stable operation of the steam turbine is very important in the process of power generation. The working medium enters the steam turbine through the steam inlet pipeline system to complete the process of converting heat energy into mechanical energy. A steam valve (also referred to as a valve) is disposed on a steam inlet pipeline system of the steam turbine (such as a high-pressure cylinder steam inlet pipeline system, an intermediate-pressure cylinder steam inlet pipeline system, etc.), and generally includes an isolation valve and a regulating valve. The steam valve mainly comprises a valve body, a valve cover, a valve rod, a sealing element and the like, wherein the valve body is connected with the valve cover through a bolt.
In the actual operation process of the unit, compared with the normal-temperature and normal-pressure air outside the steam inlet valve of the steam turbine, the high-temperature and high-pressure working medium is arranged in the valve (the pressure and temperature grades of the working medium of the ultra-supercritical unit are higher, such as 28MPa and 600 ℃), and the acting force of the working medium on the inner surface of the valve cover is far greater than the acting force of the air on the outer surface of the valve cover. At this time, the bolts connecting the valve body and the bonnet and fastening the bonnet are required to endure a considerable tensile stress. At present, a turbine mostly adopts a sliding pressure constant temperature operation mode (that is, when a unit load is in a normal operation range, the pressure of a turbine inlet working medium is reduced along with the reduction of the load, and the temperature of the working medium is kept stable), when the unit load is higher, the pressure of the working medium is also higher, and the tensile stress of a bolt for fastening a valve cover of a steam valve is also higher. Therefore, the fastening bolt of the valve cover of the steam valve is high in temperature and bears large tensile stress, the tensile stress changes correspondingly along with the frequent change of the unit load, and the working environment is severe.
At present, in a 600MW grade and 1000MW grade supercritical unit which is put into production partially, the situation of crack or even fracture defects of a valve cover bolt of a steam valve is common, so that steam leakage of the valve cover is easily caused, the operation safety and reliability of the valve cover of the steam valve are seriously influenced, serious hidden dangers are caused to the personal safety of workers of a power plant, equipment and the safe and stable operation of the unit, and further the unit is possibly not stopped or even serious personal safety, equipment safety accidents and the like are possibly caused. When the bolt has a fracture defect, the bolt with the fracture defect can be confirmed after the bolt is stopped, and the bolt is replaced by a new bolt to eliminate the defect.
Therefore, the technical personnel in the field are dedicated to develop a fastening device of a steam valve of a steam turbine, so as to delay and even prevent the crack and even fracture defects of a bolt of a valve cover of the steam valve, improve the operation safety and reliability of the valve cover of the steam valve, reduce the times of shutdown and emergency repair and reduce the production and operation cost of a steam turbine set.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is how to delay or even prevent the crack or fracture defect of the bonnet bolt, and improve the operational safety and reliability of the steam valve bonnet.
To achieve the above object, the present invention provides a fastening device for a steam valve of a steam turbine, comprising an upper flange configured to press a valve cover, a lower flange configured to hoop a valve body, and a connecting bolt configured to connect and fasten the upper flange and the lower flange.
Further, a seat is provided between the lower flange and the valve body, the seat being configured for effective intimate contact of the lower flange with the valve body.
Further, a reinforcing and fixing mechanism is installed on the side portion of the lower flange.
Further, the reinforcing and fixing mechanism is a U-shaped reinforcing plate.
Furthermore, a supporting bolt is arranged on the outer side of the connecting bolt, and two ends of the supporting bolt are connected with the upper flange and the lower flange nut.
Further, the nut connected with the nut is a cover nut.
Further, the holder is provided with a holder fixing ring.
Further, the mount securing ring is configured to be secured using screws.
Further, the screw is a socket head cap screw.
Further, the reinforcing and fixing mechanism further comprises a reinforcing rib.
The technical scheme of the invention is that a fastening device is additionally arranged on a steam valve of a steam turbine and comprises an upper flange, a lower flange and a connecting bolt, wherein the upper flange is arranged on a valve cover, the lower flange is arranged at a proper position of a valve body, and the upper flange and the lower flange are connected by the bolt.
Preferably, a support is arranged between the lower flange and the valve body, so that the lower flange and the valve body are effectively and tightly contacted.
Preferably, the lower flange is located at the steam inlet pipe of the steam valve, and a notch is formed in the lower flange, so that the rigidity of the lower flange at the steam inlet of the steam valve is poor, therefore, a reinforcing plate is welded on the upper side of the lower flange at the steam inlet of the steam valve, a U-shaped or other-shaped reinforcing plate is added on the lower side (the reinforcing plate is welded, and the size of the reinforcing plate is matched with the outer diameter of the steam inlet pipe of the steam valve), and finally the lower flange at the steam inlet of the steam valve forms a fixed structure. After the reinforcing plate is arranged, the rigidity of the lower flange can be increased, and the pretightening force applied by the connecting bolts can be uniformly distributed on the lower flange.
Preferably, in order to ensure that the pretightening force of the fastening device is uniformly applied to the medium-pressure main steam valve cover, a supporting bolt is arranged on the outer side of a connecting bolt of the fastening device, two ends of the supporting bolt are connected with an upper flange and a lower flange of the fastening device through nuts, and after the supporting bolt is arranged, the pretightening force applied by the connecting bolt can be uniformly distributed on the steam valve cover.
The invention has the technical effects that at least:
after the fastening device is arranged on the steam valve of the steam turbine, the fastening device can share the tensile stress borne by the valve cover bolt of the steam valve in the actual operation process of a unit, so that the defect that the valve cover bolt has cracks or even breaks can be delayed or even prevented;
furthermore, under the condition that steam leaks from the valve cover due to the breakage of part of the bolts, the fastening device can still effectively fasten the valve cover, and the fastening device can fasten the connecting bolts close to the steam leakage position of the valve cover to increase the fastening force of the valve cover so as to eliminate the steam leakage defect;
furthermore, when the extreme condition that all the valve cover bolts are broken occurs, the fastening device can still ensure that the valve cover does not fly off the steam valve, and personal and equipment safety accidents are effectively prevented.
In conclusion, the fastening device of the steam valve of the steam turbine can delay or even prevent the crack or even fracture defect of the valve cover bolt, effectively improve the safety and reliability of the valve cover of the steam valve, ensure the operation safety of the unit, reduce the shutdown and emergency repair times and reduce the production and operation cost of the steam turbine unit.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of the solution according to the invention;
FIG. 2 is a schematic diagram of a preferred embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the solution of the present invention.
Fig. 1 is a schematic diagram of the technical solution of the present invention, wherein a valve cover 21 is fixed on a valve body 20, and fastening devices including an upper flange 22, a lower flange 23 and a connecting bolt 24 are arranged outside the valve cover 21 and the valve body 20. An upper flange 22 is disposed on the valve cover 21, a lower flange 23 is disposed at a proper position of the valve body 20, and the upper flange 22 and the lower flange 23 are connected with a connection bolt 24.
When the original fastening bolt of the valve cover 21 is broken and fails due to some reason, the external fastening device can play an additional fastening role, so that the safety and the reliability of the operation of the valve cover are enhanced.
Fig. 2 is a schematic view of a preferred embodiment of the present invention, in which a valve cover is fixed to a valve body, and fastening means are provided on the exterior of the valve cover and the valve body, wherein a stud bolt 6 and a cage nut 1 thereof are combined to form a coupling bolt 24, and the coupling bolt 24 is used for fastening an upper flange 22 and a lower flange 23. In addition, the stud stay bolt 8 and its cage nut 2 are combined to form a stay bolt. A washer 3 is arranged between the stud bolt 6 and the cage nut 1, and a washer 4 is arranged between the stud support bolt 8 and the cage nut 2, so as to prevent the cage nut 1 and the cage nut 2 from vibrating and loosening.
A plurality of stud bolts 7 are also provided on the periphery of the upper flange 22. Lower flange supports 9 are arranged on two opposite sides of the lower flange 23, lower flange support fixing rings 10 are used for fixing the lower flange supports 9, and the lower flange support fixing rings 10 are connected with the lower flange supports 9 through socket head cap screws 17. The upper flange upper support 12 and the lower flange lower support 13 are respectively arranged at the upper side and the lower side of the lower flange 23, the upper flange upper support 12 is connected with the lower flange 23 through a lower flange upper connection 16, the lower flange lower support 13 is connected with the lower flange 23 through a lower flange lower connection 14, and a lower flange reinforcing rib 15 is arranged at the connection part of the lower flange lower support 13 and the lower flange lower connection 14.
The technical scheme of the invention is that all steam valves are additionally provided with fastening devices which comprise upper flanges, lower flanges and connecting bolts, wherein the upper flanges are arranged on the valve covers, the lower flanges are arranged at proper positions of the valve bodies, and the upper flanges and the lower flanges are connected by the bolts.
Preferably, a support is arranged between the lower flange and the valve body, so that the lower flange and the valve body are effectively and tightly contacted.
Preferably, the lower flange is located at the position of the steam inlet pipe of the steam valve, and a notch is formed in the lower flange, so that the rigidity of the lower flange at the steam inlet of the steam valve is poor, therefore, a reinforcing plate is welded on the upper side of the lower flange at the steam inlet of the steam valve, a U-shaped or other-shaped reinforcing plate is added on the lower side (the reinforcing plate is welded, and the size of the reinforcing plate is matched with the outer diameter of the steam inlet pipe of the steam valve), and finally, a fixing structure is formed between the steam inlet of the steam valve and the lower flange. After the reinforcing plate is arranged, the rigidity of the lower flange can be increased, and the pretightening force applied by the connecting bolts can be uniformly distributed on the lower flange.
Preferably; in order to ensure that the pretightening force of the fastening device is uniformly applied to the steam valve cover, a supporting bolt is arranged on the outer side of a connecting bolt of the fastening device, two ends of the supporting bolt are connected with an upper flange and a lower flange of the fastening device through nuts, and after the supporting bolt is arranged, the pretightening force applied by the connecting bolt can be uniformly distributed on the steam valve cover.
The invention has the technical effects that at least:
after the fastening device is arranged on the steam valve of the steam turbine, the fastening device can share the tensile stress borne by the valve cover bolt of the steam valve in the actual operation process of a unit, so that the defect that the valve cover bolt has cracks or even breaks can be delayed or even prevented;
furthermore, under the condition that steam leaks from the valve cover due to the breakage of part of the bolts, the fastening device can still effectively fasten the valve cover, and the fastening device can fasten the bolts close to the steam leakage position of the valve cover to increase the fastening force of the valve cover so as to eliminate the steam leakage defect;
furthermore, when the extreme condition that all the valve cover bolts are broken occurs, the fastening device can still ensure that the valve cover does not fly off the steam valve, and personal and equipment safety accidents are effectively prevented.
In conclusion, the fastening device of the steam valve of the steam turbine can delay or even prevent the crack or even fracture defect of the valve cover bolt, effectively improve the safety and reliability of the valve cover of the steam valve, ensure the operation safety of the unit, reduce the shutdown and emergency repair times and reduce the production and operation cost of the steam turbine unit.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A fastening device of a steam valve of a steam turbine is characterized by comprising an upper flange, a lower flange and a connecting bolt, wherein the upper flange is configured to press a valve cover, the lower flange is configured to hoop a valve body, and the connecting bolt is configured to be used for connecting and fastening the upper flange and the lower flange.
2. The steam turbine valve fastening device as recited in claim 1, wherein a seat is provided between the lower flange and the valve body, the seat being configured for effective intimate contact of the lower flange with the valve body.
3. The steam turbine steam valve fastening device as claimed in claim 1, wherein the lower flange is provided at a side thereof with a reinforcing fixing mechanism.
4. The steam turbine steam valve fastening device of claim 3, wherein the reinforcing securing mechanism is a U-shaped reinforcing plate.
5. The steam turbine steam valve fastening device as claimed in claim 1, wherein a stay bolt is provided outside the connecting bolt, and both ends of the stay bolt are connected to the upper flange and the lower flange by nuts.
6. The steam turbine steam valve fastening device of claim 5, wherein the nut to which the nut is attached is a bonnet nut.
7. The steam turbine steam valve fastening arrangement as recited in claim 2, wherein the pedestal is configured with a pedestal retaining ring.
8. The steam turbine valve fastening arrangement of claim 7, wherein the mount retaining ring is configured to be secured using screws.
9. The steam turbine steam valve fastening device of claim 8, wherein the screw is a socket head cap screw.
10. The steam turbine valve fastening assembly as recited in claim 3, wherein the reinforcing fixture further comprises a reinforcing rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357690.5A CN111075517A (en) | 2019-12-25 | 2019-12-25 | Fastening device for steam valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357690.5A CN111075517A (en) | 2019-12-25 | 2019-12-25 | Fastening device for steam valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111075517A true CN111075517A (en) | 2020-04-28 |
Family
ID=70317702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911357690.5A Pending CN111075517A (en) | 2019-12-25 | 2019-12-25 | Fastening device for steam valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111075517A (en) |
-
2019
- 2019-12-25 CN CN201911357690.5A patent/CN111075517A/en active Pending
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