CN219954203U - Leakage blocking device for horizontal plane stress release hole of generator end cover - Google Patents
Leakage blocking device for horizontal plane stress release hole of generator end cover Download PDFInfo
- Publication number
- CN219954203U CN219954203U CN202321046600.2U CN202321046600U CN219954203U CN 219954203 U CN219954203 U CN 219954203U CN 202321046600 U CN202321046600 U CN 202321046600U CN 219954203 U CN219954203 U CN 219954203U
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- plate body
- plugging
- generator
- blocking plate
- end cover
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 30
- 239000000565 sealant Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 abstract description 50
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 50
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 49
- 238000001816 cooling Methods 0.000 abstract description 6
- 230000001502 supplementing effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 238000004880 explosion Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model relates to the technical field of hydrogen cooling steam turbine generator plugging, and particularly discloses a plugging device for a horizontal plane stress release hole of a generator end cover, which comprises a lower plugging plate body, a connecting screw, an upper plugging plate body, a nut, an exhaust pipe and a valve, wherein the lower plugging plate body and the upper plugging plate body are oppositely arranged, and the lower plugging plate body and the upper plugging plate body are respectively arranged at the lower side and the upper side of the horizontal plane stress release hole of the generator end cover; the lower blocking plate body is provided with a lower blocking plate nut, the upper blocking plate body is provided with an upper blocking plate screw hole, the lower blocking plate nut is connected with a connecting screw rod, and the connecting screw rod penetrates out of the upper blocking plate screw hole and is fixed through a screw cap; the lower plugging plate body, the upper plugging plate body and the generator end cover are subjected to sealing treatment through a metal repairing agent and sealant; the exhaust pipe is arranged on the upper plugging plate body, and a valve is arranged at the end part of the exhaust pipe; the external hydrogen leakage of the hydrogen-cooled generator can be blocked under the running state of the generator, and the hydrogen supplementing operation is reduced.
Description
Technical Field
The utility model relates to the technical field of hydrogen-cooled turbogenerator plugging, in particular to a plugging device for a horizontal plane stress release hole of a generator end cover.
Background
The large-sized turbo generator set adopts hydrogen for cooling, the hydrogen is used as a cooling medium, the advantages of low density, strong heat conduction capability, stable cleaning and cooling effects and the like are achieved, ventilation loss of the generator and friction loss of the rotor surface to gas can be reduced by using the hydrogen for cooling, heat conduction capability of an insulation inner gap and other gaps can be improved, heat conduction effect can be enhanced, cleaning of the inside of the generator can be maintained, accidents can be reduced, and service life of insulating materials can be prolonged. Hydrogen is a flammable and explosive gas with strong explosion characteristics, because of the specificity of hydrogen molecules, the molecular movement speed is the fastest, the maximum diffusion speed and the high thermal conductivity are achieved, the thermal conductivity is 6.7 times of that of air, the hydrogen permeability is strong, and the hydrogen can permeate rubber at normal temperature, so the tightness requirement on a generator is high to prevent the hydrogen from leaking outwards, meanwhile, the structure and the system operation complexity of the generator can be brought by adopting hydrogen cooling, the strict tightness must be ensured, a special hydrogen supply device must be arranged, strict monitoring means must be adopted, an explosion-proof structure and the like are necessary, and the hydrogen cooling technology is widely applied to large-scale generators and is mature.
At present, the problem that hydrogen leakage cannot be completely avoided when a hydrogen-cooled generator set operates is solved, the hydrogen leakage amount is large in the operation of a generator, the hydrogen pressure can be reduced rapidly, the temperature of internal parts of the generator is increased, the service life of the generator is influenced, and if leaked hydrogen is accumulated in a factory building, the explosion hazard exists when the hydrogen content in the factory building reaches the explosion limit. The hydrogen leakage in the operation of the hydrogen-cooled turbogenerator belongs to a fault which is difficult to solve, has seriously affected the safe and stable operation of the generator set, and is extremely easy to cause casualties and equipment damage. Therefore, when the hydrogen supplementing amount is large in the operation of the generator, the reason must be analyzed in time, the leakage position needs to be immediately checked, effective measures are taken for plugging, the hydrogen leakage amount of the generator is controlled within a standard range, otherwise, the generator set is forced to stop, huge economic loss is caused, and the safe operation of the power plant is threatened.
Although there are many ways of hydrogen leakage of the generator, two kinds of methods are summarized: firstly, the air leaks into the atmosphere, and secondly, the air leaks into an oil-water system of the generator and into a sealing shell. The former can find out the leak point to eliminate through various leak detection methods, such as the hydrogen leakage at the generator end cover, the wire outlet cover, the generator base, the hydrogen pipeline system, the temperature measuring element binding post plate and the like; the latter basically belongs to 'dark leakage', the specific position of the leakage point is unknown, the checking treatment is complex, and the treatment time is long, for example, hydrogen leaks into a sealing oil system through a sealing tile, leaks into an internal cooling water system through a stator coil and the like.
The main hazards of hydrogen leakage of the generator are as follows:
the hydrogen humidity is too high or the water and oil of the generator are fed to damage the insulation of stator and rotor windings of the generator, and the phase or ground short circuit accident is caused when serious;
excessive hydrogen is consumed, the hydrogen supplementing operation is frequent, the hydrogen production is frequent, and the running cost is increased;
the explosion limit of hydrogen in air is: 4.0% -75%, and the danger that the generator system may catch fire and deflagrate when encountering fire sources or sparks. When the hydrogen leakage of the generator reaches a certain value and the hydrogen pressure cannot be ensured, the generator is stopped immediately according to the requirement of the operation rule.
At present, the large cover at the end part of the steam turbine generator leaks hydrogen at a weak position with large hydrogen leakage amount, and an maintainer usually adopts a temporary measure of fastening the large cover bolt at the end part or plugging by sealant to reduce or eliminate hydrogen leakage, but in certain cases, only fastening the end cover bolt or plugging the leakage point by sealant can not completely eliminate the leakage point, so that the sealing effect of the end cover of the generator can not be ensured. The problem of hydrogen leakage of the generator is blocked by pressure, and various studies are also made by the person skilled in the art, but the problem of hydrogen leakage still exists due to the technical problem of installation and abrasion in operation in the process of installing or using the generator, and the traditional leakage blocking method is difficult to thoroughly block the hydrogen leakage part once leakage occurs in operation. If the defect of hydrogen leakage of the generator end cover is thoroughly overcome, the generator end cover is required to be stopped and reassembled, the end cover sealant is required to be replaced, maintenance work is required to be stopped for more than ten days, the stable operation of the unit is influenced, the generated energy is lost, and large economic loss is caused.
Disclosure of Invention
The utility model aims to provide a plugging device for a horizontal stress release hole of a generator end cover, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a generator end cover horizontal plane stress relief hole plugging device, includes lower closure plate body, connecting screw rod, goes up closure plate body, nut, blast pipe, valve, lower closure plate body, last closure plate body set up relatively, and lower closure plate body, last closure plate body set up respectively in generator end cover horizontal plane stress relief hole's downside, upside; the lower blocking plate body is provided with a lower blocking plate nut, the upper blocking plate body is provided with an upper blocking plate screw hole, the lower blocking plate nut is connected with the end part of the connecting screw rod, and the other end of the connecting screw rod penetrates out of the upper blocking plate screw hole and is fixed through a screw cap; the lower plugging plate body, the upper plugging plate body and the generator end cover are subjected to sealing treatment through a metal repairing agent and sealant; the exhaust pipe is arranged on the upper blocking plate body, and a valve is arranged at the end part of the exhaust pipe.
Preferably, the joint surface between the side surface of the lower blocking plate body and the bottom of the generator end cover is filled and bonded by uniformly coating a metal repairing agent; the upper part of the lower blocking plate body is sealed with the inside of the stress release hole through the filled sealant.
Preferably, the joint surface of the side surface of the upper plugging plate body and the upper part of the end cover of the generator is filled and bonded by smearing a uniform metal repairing agent, the upper part of the upper plugging plate body is sealed by pouring sealant, and a vertical baffle is arranged on the upper part of the end cover of the generator to enclose the sealant.
Preferably, a first O-shaped ring is arranged at the upper part of the upper plugging plate body, and a second O-shaped ring is adhered to the upper part of the first O-shaped ring through a sealing adhesive; the first O-shaped ring and the second O-shaped ring are sleeved outside the connecting screw, a gasket is arranged on the upper portion of the second O-shaped ring, and the nut is arranged on the upper side of the gasket.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the plugging plates are additionally arranged on the upper horizontal surface and the lower horizontal surface of the stress release hole at the horizontal surface of the generator end cover, and after the upper plugging plate and the lower plugging plate are fastened by screw clamps, the sealing glue is used for plugging, so that the hydrogen leakage outside the joint surface of the end cover can be reduced, and the safe and stable operation of the generator is ensured; the utility model has simple structure and convenient installation, and the plugging plate on the plugging device is provided with the exhaust pipe and the valve to prevent the unset sealant from being washed away by hydrogen, thereby solving the problem that hydrogen leakage from the horizontal stress release hole of the generator end cover can not be treated in operation, and avoiding the embarrassment that the generator is required to be stopped for treatment due to large hydrogen leakage when the hydrogen-cooled generator is in operation.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is an installation view of the upper closure plate of the present utility model;
FIG. 3 is a sectional view of the installation of the present utility model;
reference numerals in the drawings: 1. a lower closure plate body; 2. a lower closure plate nut; 3. a connecting screw; 4. an upper closure plate body; 5. upper blocking plate screw holes; 6. a first O-ring; 7. a second O-ring; 8. a gasket; 9. a screw cap; 10. an exhaust pipe; 11. sealing glue; 12. a metal repair agent; 13. a baffle; 14. and (3) a valve.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-3, the present utility model provides a technical solution: the utility model provides a generator end cover horizontal plane stress relief hole plugging device, includes lower closure plate body 1, connecting screw rod 3, upper closure plate body 4, nut 9, blast pipe 10, valve 14, lower closure plate body 1, upper closure plate body 4 set up relatively, and lower closure plate body 1, upper closure plate body 4 set up in generator end cover horizontal plane stress relief hole's downside, upside respectively; the lower plugging plate body 1 is provided with a lower plugging plate nut 2, the upper plugging plate body 4 is provided with an upper plugging plate screw hole 5, the lower plugging plate nut 2 is connected with the end part of the connecting screw rod 3, and the other end of the connecting screw rod 3 penetrates out of the upper plugging plate screw hole 5 and is fixed through a screw cap 9; the lower plugging plate body 1, the upper plugging plate body 4 and the generator end cover are subjected to sealing treatment through a metal repairing agent 12 and a sealant 11; the exhaust pipe 10 is provided on the upper closure plate body 4, and a valve 14 is provided at an end of the exhaust pipe 10.
Furthermore, the joint surface between the side surface of the lower blocking plate body 1 and the bottom of the generator end cover is filled and bonded by uniformly coating a metal repairing agent 12; the upper part of the lower closure plate body 1 is sealed with the inside of the stress release hole through the filled sealant 11.
Furthermore, the joint surface of the side surface of the upper plugging plate body 4 and the upper part of the end cover of the generator is filled and bonded by smearing the uniform metal repairing agent 12, the upper part of the upper plugging plate body 4 is sealed by pouring the sealant 11, and the upper part of the end cover of the generator is provided with a vertical baffle 13 for enclosing the sealant 11.
Further, a first O-shaped ring 6 is arranged at the upper part of the upper plugging plate body 4, and a second O-shaped ring 7 is adhered to the upper part of the first O-shaped ring 6 through a sealant 11; the first O-shaped ring 6 and the second O-shaped ring 7 are sleeved outside the connecting screw 3, a gasket 8 is arranged on the upper portion of the second O-shaped ring 7, and the nut 9 is arranged on the upper side of the gasket 8.
Working principle: the lower plugging plate body 1 is arranged below a stress release hole in the horizontal plane of the generator end cover, the bonding surface of the stress release hole and the lower plugging plate body 1 is uniformly coated by a metal repairing agent 12 to be filled and bonded, the connecting screw 3 is screwed into the lower plugging plate nut 2, and after the metal repairing agent 12 is solidified, sealant 11 is filled from the upper side of the stress release hole to thoroughly seal the inner side of the lower plugging plate body 1 firmly.
The connecting screw 3 passes through the upper baffle screw hole 5 to be connected with the upper baffle body 4, the metal repairing agent 12 is used for uniformly coating the stress release hole and the upper baffle body 4 to be filled and bonded, the sealing glue 11 is coated on the upper part of the first O-shaped ring 6 to be bonded with the second O-shaped ring 7 after the connection, the connecting screw 3 passes through the two groups of O-shaped rings, the gasket 8 is arranged on the upper part of the second O-shaped ring 7, the screw cap 9 is arranged on the connecting screw 3 and fastened, the two groups of O-shaped rings are tightly pressed through the gasket 8, finally the sealing glue 11 is filled on the surface of the upper baffle body 4 which is firmly connected, and the baffle 13 is used for limiting the filling area of the sealing glue 11.
The plugging device for the horizontal stress release hole of the generator end cover can plug the hydrogen leakage outside the hydrogen-cooled generator in the running state of the generator, ensure that the hydrogen pressure of the generator is maintained to be normal, reduce the hydrogen supplementing operation, eliminate the potential safety hazard caused by the hydrogen leakage, improve the production efficiency and save the production cost. After the on-site actual plugging effect inspection, the plugging device is additionally arranged in the stress release hole at the horizontal plane of the end cover of the generator, no leakage is measured at the upper plugging surface and the lower plugging surface by using a leak detector, and the hydrogen supplementing amount of the generator is reduced from 21m3 to 8m3 in 24 hours, so that the effect is obvious.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a generator end cover horizontal plane stress relief hole plugging device which characterized in that: the device comprises a lower plugging plate body (1), a connecting screw (3), an upper plugging plate body (4), a screw cap (9), an exhaust pipe (10) and a valve (14), wherein the lower plugging plate body (1) and the upper plugging plate body (4) are oppositely arranged, and the lower plugging plate body (1) and the upper plugging plate body (4) are respectively arranged at the lower side and the upper side of a horizontal stress release hole of an end cover of a generator; the lower blocking plate comprises a lower blocking plate body (1), a lower blocking plate nut (2) is arranged on the lower blocking plate body (1), an upper blocking plate screw hole (5) is formed in the upper blocking plate body (4), the lower blocking plate nut (2) is connected with the end part of a connecting screw rod (3), and the other end of the connecting screw rod (3) penetrates out of the upper blocking plate screw hole (5) and is fixed through a screw cap (9); the lower plugging plate body (1), the upper plugging plate body (4) and the generator end cover are subjected to sealing treatment through a metal repairing agent (12) and a sealant (11); the exhaust pipe (10) is arranged on the upper closure plate body (4), and a valve (14) is arranged at the end part of the exhaust pipe (10).
2. The generator end cap horizontal plane stress relief hole plugging device of claim 1, wherein: the joint surface between the side surface of the lower blocking plate body (1) and the bottom of the generator end cover is filled and bonded by uniformly coating a metal repairing agent (12); the upper part of the lower plugging plate body (1) and the inside of the stress release hole are sealed by the filled sealant (11).
3. The generator end cap horizontal plane stress relief hole plugging device of claim 1, wherein: the upper part of the upper blocking plate body (4) is sealed by pouring sealant (11), and the upper part of the generator end cover is provided with a vertical baffle (13) for enclosing the sealant (11).
4. The generator end cap horizontal plane stress relief hole plugging device of claim 1, wherein: the upper part of the upper plugging plate body (4) is provided with a first O-shaped ring (6), and the upper part of the first O-shaped ring (6) is adhered with a second O-shaped ring (7) through a sealant (11); the first O-shaped ring (6) and the second O-shaped ring (7) are sleeved outside the connecting screw rod (3), a gasket (8) is arranged on the upper portion of the second O-shaped ring (7), and the nut (9) is arranged on the upper side of the gasket (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321046600.2U CN219954203U (en) | 2023-05-05 | 2023-05-05 | Leakage blocking device for horizontal plane stress release hole of generator end cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321046600.2U CN219954203U (en) | 2023-05-05 | 2023-05-05 | Leakage blocking device for horizontal plane stress release hole of generator end cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219954203U true CN219954203U (en) | 2023-11-03 |
Family
ID=88557245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321046600.2U Active CN219954203U (en) | 2023-05-05 | 2023-05-05 | Leakage blocking device for horizontal plane stress release hole of generator end cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219954203U (en) |
-
2023
- 2023-05-05 CN CN202321046600.2U patent/CN219954203U/en active Active
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