CN115218172B - Spiral-lock type flow channel plugging device and method for steam generator - Google Patents
Spiral-lock type flow channel plugging device and method for steam generator Download PDFInfo
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- CN115218172B CN115218172B CN202210607862.5A CN202210607862A CN115218172B CN 115218172 B CN115218172 B CN 115218172B CN 202210607862 A CN202210607862 A CN 202210607862A CN 115218172 B CN115218172 B CN 115218172B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 3
- 210000001503 joint Anatomy 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Clamps And Clips (AREA)
Abstract
The invention discloses a turnbuckle type water flow channel plugging device and a turnbuckle type water flow channel plugging method for a steam generator, and relates to the technical field of steam generators, wherein the turnbuckle type water flow channel plugging device comprises a clamping shaft and a pressing sleeve, one end of the clamping shaft is connected with a clamping plate, the other end of the clamping shaft penetrates through the pressing sleeve, and a spring which is in butt joint with the pressing sleeve is sleeved on the outer side of the clamping shaft; the two sides of the clamping shaft are symmetrically provided with convex parts, the outer surface of the pressing sleeve is provided with a male groove, the inner surface of the pressing sleeve is provided with a female groove which forms a set angle with the male groove, and the two sides of the pressing sleeve are provided with overhanging parts; the protruding part is positioned in the male groove to be in a first state, the protruding part is positioned in the female groove to be in a second state, and the clamping shaft is rotated to change the first state into the second state, so that the clamping plate is matched with the extending part of the pressing sleeve to seal the water flowing groove. The invention can be firmly arranged in the top support plate flume area, effectively reduces the local flow velocity of the area during the operation of the steam generator, reserves the internal channel of the secondary side in-service inspection of the steam generator, and improves the safety and reliability of the steam generator which is partially finished or operated.
Description
Technical Field
The invention relates to the technical field of steam generators, in particular to a turnbuckle type flow channel plugging device and method for a steam generator.
Background
The steam generator heat transfer tube bundle support plate is a key component for increasing the support rigidity of the heat transfer tube bundle and improving the flow induced vibration resistance thereof. Depending on the structure and arrangement of the steam generator heat transfer tube bundle, a number of support plates are typically provided at axial heights so that the unsupported spans meet the design requirements. Generally, the tube bundle support plates can be divided into intermediate support plates and top support plates, with the difference that the flow channel structure in the tube lane regions of the U-shaped heat transfer tubes is different.
In order to make the flow field at the top of the heat transfer tube bundle tend to be uniform, a plurality of small round holes are arranged in the tube gallery area of the top support plate to serve as water flowing holes, a plurality of square grooves are arranged to serve as water flowing grooves, and the function of an in-service inspection channel is considered. However, the flow resistance of the pipe gallery area is smaller than that of the penetrating pipe area, so that the local flow velocity of the secondary side (shell side) fluid of the steam generator in the pipe gallery area is larger, and the flow velocity increase of the square water flowing groove area is more remarkable.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a turnbuckle type flow channel plugging device and a turnbuckle type flow channel plugging method for a steam generator, which can be firmly arranged in a flow channel area of a top support plate, effectively reduce the local flow velocity of the area during the operation of the steam generator, reserve the internal channel of the secondary side in-service inspection of the steam generator, and improve the safety and reliability of the partially finished or operated steam generator.
In order to achieve the above object, the present invention is realized by the following technical scheme:
In a first aspect, an embodiment of the invention provides a plugging device for a rotary-button top support plate flume of a steam generator, which comprises a clamping shaft and a pressing sleeve, wherein one end of the clamping shaft is connected with a clamping plate, the other end of the clamping shaft penetrates through the pressing sleeve, and a spring which is in butt joint with the pressing sleeve is sleeved on the outer side of the clamping shaft;
The two sides of the clamping shaft are symmetrically provided with convex parts, the outer surface of the pressing sleeve is provided with a male groove, the inner surface of the pressing sleeve is provided with a female groove which forms a set angle with the male groove, and the two sides of the pressing sleeve are provided with overhanging parts; the protruding part is positioned in the male groove to be in a first state, the protruding part is positioned in the female groove to be in a second state, and the clamping shaft is rotated to change the first state into the second state, so that the clamping plate is matched with the extending part of the pressing sleeve to seal the water flowing groove.
As a further implementation mode, a stepped cavity is formed in the pressing sleeve, and the size of the cavity gradually decreases from one end close to the female groove to the other end.
As a further implementation mode, the clamping shaft is circumferentially provided with a first boss, the cavity inside the pressing sleeve is provided with a second boss, the spring is arranged between the first boss and the second boss, and two ends of the spring are respectively embedded into the clamping groove of the first boss and the clamping groove of the second boss.
As a further implementation, the first boss diameter is less than both the first jacket compression space inner diameter and the boss length.
As a further implementation, the two male grooves and the two female grooves form a cross-shaped structure.
As a further implementation manner, the clamping plate is rectangular, and the extending directions of the two protruding portions are consistent with the width direction of the clamping plate.
As a further implementation manner, the cross section of the pressing sleeve is circular.
As a further implementation manner, a plurality of flow holes are arranged on one surface of the pressing sleeve opposite to the surface where the male groove is located.
In a second aspect, embodiments of the present invention further provide a method for using a steam generator turnbuckle type top support plate flume plugging device, comprising:
the plugging device is inserted into the water flowing groove, the clamping shaft is pressed down to enable the protruding portion to pass through the male groove to the cavity in the pressing sleeve, the clamping shaft is released after the clamping shaft is rotated by 90 degrees, the clamping shaft is fixed on the top supporting plate under the action force of the spring through the clamping plate and the pressing sleeve, and the protruding portion enters the female groove.
As a further implementation, when the plugging device is removed, the clamping shaft is pressed down until the protruding part enters the internal cavity of the pressing sleeve, the clamping shaft is rotated reversely by 90 degrees, and the device is separated from the top support plate from the upper surface after the protruding part passes through the male groove.
The beneficial effects of the invention are as follows:
according to the invention, the convex part of the clamping shaft is matched with the female groove, the male groove and the spring of the pressing sleeve, so that the device can be conveniently and firmly arranged in the water flowing groove area of the top supporting plate, and the installation and the detachment can be realized by pressing down and rotating the clamping shaft, thereby being convenient for disassembly and assembly; the method can effectively reduce the local flow velocity of the region during the operation of the steam generator, reserves the internal channel of the secondary side in-service inspection of the steam generator, and improves the safety and reliability of the steam generator which is partially finished or operated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a front view of a tube lane region according to one or more embodiments of the present invention;
FIG. 2 is a schematic view of a card axle rotated 90 according to one or more embodiments of the present invention;
FIG. 3 (a) is a perspective view of a press sleeve according to one or more embodiments of the present invention;
FIG. 3 (b) is a second perspective view of a press sleeve according to one or more embodiments of the present invention;
FIG. 4 is a schematic illustration of a card axle and card board connection in accordance with one or more embodiments of the present invention;
FIG. 5 (a) is a schematic illustration of the installation of the present invention with a top support plate according to one or more embodiments;
Fig. 5 (b) is a schematic diagram of the installation of the present invention with a top support plate according to one or more embodiments.
Wherein, 1, a clamping plate, 2, a clamping shaft, 3, a protruding part, 4, a spring, 5, a pressing sleeve, 6, a top supporting plate, 7, a male groove, 8, a rotating space, 9, a female groove, 10 and an upper through hole, 11, overhanging parts, 12, flow holes, 13, first bosses, 14, second bosses, 15, first compression spaces, 16, second compression spaces, 17 and lower through holes.
Detailed Description
Embodiment one:
The embodiment provides a steam generator turnbuckle type top support plate flume plugging device, as shown in fig. 1 and 2, the device comprises a clamping shaft 2, a clamping plate 1, a pressing sleeve 5 and a spring 4, one end of the clamping shaft 2 passes through the pressing sleeve 5 and then is connected with the clamping plate 1, the clamping plate 1 is used for contacting with the bottom surface of a flume, the other end of the clamping shaft 2 extends to the outer side of the pressing sleeve 5, the spring 4 is arranged at the outer side of the clamping shaft 2 and is located in an inner cavity of the pressing sleeve 5, and the state switching of the device is realized by pressing and rotating the clamping shaft 2.
With the orientation of the installation state of the device as a reference, the clamping plate 1 is positioned at the bottom of the clamping shaft 2, and the top end of the clamping shaft 2 extends out of the upper surface of the pressing sleeve 5.
Specifically, as shown in fig. 3 (a) and 3 (b), the press sleeve 5 is entirely cylindrical, a stepped cavity is provided in the press sleeve 5, and the cavity is penetrated through the upper through hole 10. A circular plate with a certain thickness is formed at the top of the pressing sleeve 5, and an upper through hole 10 is formed in the center of the circular plate; the cavity tapers in size from one side to the other side adjacent the circular plate.
In this embodiment, the cross section of the cavity is circular so as to be suitable for the clamping shaft 2 and to facilitate the installation of the spring 4; the diameter of the cavity is sequentially reduced from top to bottom to form a stepped structure, wherein the maximum diameter of the cavity is a rotating space 8, the direction of the protruding part 3 of the clamping shaft 2 is changed, and the first compression space 15 is used for axially moving the clamping shaft 2 and forms an axial moving space of the spring 4 together with the second compression space 16.
The bottom lower through hole 17 of the pressing sleeve 5 is provided with a second boss 14 towards the inner side, and a certain gap is reserved between the second boss 14 and the pressing sleeve 5 and is used for fixing one end of the spring 4. The shaft section of the clamping shaft 2 positioned in the rotating space 8 is provided with a first boss 13, one side of the first boss 13 corresponding to the second boss 14 is provided with a clamping groove, and the other end of the spring 4 is fixed through the clamping groove; the first boss 13 and the second boss 14 cooperate to realize the limit of the spring 4.
The top of the clamping shaft 2 is provided with a hexagonal head for applying force. As shown in fig. 4, the clamping shaft 2 is of a reducing structure, one end of the connecting clamping plate 1 is smaller in diameter than the other end, the first boss 13 and the protruding portion 3 are arranged on a section of the clamping shaft 2 with a larger diameter, and the lateral dimension of the protruding portion 3 is larger than that of the first boss 13.
The two sides of the clamping shaft 2 are symmetrically provided with the protruding parts 3, and the two protruding parts 3 are arranged on the same horizontal plane and are perpendicular to the axis of the clamping shaft 2, so that a cross-shaped structure is formed. The boss 3 may be cylindrical, rectangular or other shape.
In the present embodiment, the cross sections of the first boss 13 and the second boss 14 are circular, and the diameter of the first boss 13 is smaller than the length of the boss 3.
As shown in fig. 3 (a), the upper surface of the pressing sleeve 5 is provided with a male groove 7, and the male groove 7 is communicated with the side surface of the upper through hole 10; the male groove 7 is adapted to the boss 3 to form a straight structure, and the male groove 7 communicates with the rotation space 8.
The inner surface of the press sleeve 5 (the surface corresponding to the top of the rotating space 8) is provided with a female groove 9, and the female groove 9 is communicated with the rotating space 8 but does not penetrate through the upper surface of the press sleeve 5. In the present embodiment, the male groove 7 refers to a groove visible from the outside, and the female groove 9 refers to a groove hidden inside the press sleeve 5.
The two female grooves 9 also form a straight-line structure, and the straight-line structure formed by the female grooves 9 and the male grooves 7 is vertical, namely, the included angle is 90 degrees. With the protruding part 3 in the male groove 7 as a first state and the protruding part 3 in the female groove 9 as a second state, the clamping shaft 2 is pressed down to enable the protruding part 3 to enter the rotating space 8 from the male groove 7, the clamping shaft 2 is loosened after rotating by 90 degrees, and the protruding part 3 enters the female groove 9, so that state switching of the clamping shaft 2 is realized.
When the clamping shaft 2 is in the first state, the device can move relative to the water flowing groove of the top supporting plate 6, and when the clamping shaft 2 is in the second state, the clamping plate 1 and the clamping shaft 2 are matched to enable the device to be fixed in the water flowing groove, so that the blocking of the water flowing groove is realized.
The outer side of the pressing sleeve 5 is symmetrically provided with the overhanging parts 11, and the overhanging parts 11 can be arranged according to actual requirements, for example, the shape of the overhanging parts is circular arc, rectangular and the like. As shown in fig. 3 (b), the bottom surface of the pressing sleeve 5 may be provided with a plurality of through holes 12 according to actual requirements, and the through holes 12 are communicated with the cavity inside the pressing sleeve 5.
The clamping plate 1 is of a rectangular structure and is suitable for the water flowing groove; the width direction of the card 1 is consistent with the extending direction of the protruding part 3.
As shown in fig. 5 (a) -5 (b), when the chuck shaft 2 is in the second state, the longitudinal direction of the chuck plate 1 is perpendicular to the extending direction of the overhanging portion 11, the two ends of the chuck plate 1 in the longitudinal direction are abutted against the width direction of the bottom surface of the water channel, and the overhanging portion 11 is abutted against the length direction of the top surface of the water channel, so that the chuck plate is firmly mounted in the water channel region of the top support plate 6.
The clamping shaft of the embodiment is formed by turning a cylindrical bar to form a contour, and the clamping groove of the first boss 13 is formed by machining; the boss 3 is welded to the chuck shaft 2 or machined. The clamping plate 1 is made of a plate material, one of plate material/bar material/forge piece types is selected to manufacture a pressing sleeve 5, and a male groove 7, a female groove 9, a rotating space 8, a first compression space 15, a second compression space 16 and the like in the pressing sleeve 5 are machined. Standard compression springs are adopted and placed in cavities formed by the first boss 13, the second boss 14, the first compression space 15 and the second compression space 16 of the press sleeve.
The embodiment is conveniently installed on the top supporting plate 6 of the steam generator by means of the spiral fastening and clamping mode of the spring 4, the protruding portion 3 of the clamping shaft 2 and the pressing sleeve 5, and can be easily removed, so that the partial flow rate of the area during the operation of the steam generator is effectively reduced, meanwhile, the internal channel of the secondary side in-service inspection of the steam generator is reserved, and the safety and reliability of the steam generator which is partially finished or operated are improved.
Different types and sizes of plugging devices can be designed according to the top support plate 6 and even the middle support plate water flow channels with different structures on different steam generators, and water flow holes with different sizes and numbers can be formed on the plugging devices according to design requirements.
Embodiment two:
the embodiment provides a use method of a rotary-button top support plate flume plugging device of a steam generator, which comprises the following steps:
1. The plugging device of the first embodiment is manufactured by the following process:
(1) The spring 4 is arranged in the second compression space 16 of the pressing sleeve 5, and the lower end of the spring is embedded into a clamping groove surrounded by the second boss 14 of the pressing sleeve 5;
(2) Inserting the clamping shaft 2 with the protruding part 3 into the pressing sleeve 5, and embedding the upper end of the spring 4 into a clamping groove of a first boss 13 of the clamping shaft 2;
(3) The clamping shaft 2 passes through the lower through hole 17 of the pressing sleeve 5 and is welded with the clamping plate 1.
2. The plugging device is arranged in the launder, and the process is as follows:
(1) The whole device is inserted into a water flowing groove, the clamping shaft 2 is pressed down, the protruding part 3 passes through the male groove 7 of the pressing sleeve 5 until the protruding part 3 enters the rotating space 8 of the pressing sleeve 5 and then rotates for 90 degrees, and a force application point is provided by the hexagon head at the top of the clamping shaft 2;
(2) The clamping shaft 2 is released, the whole device is firmly fixed on the top supporting plate 6 by the clamping plate 1 and the pressing sleeve 5 under the acting force of the spring 4, and meanwhile, the protruding part 3 of the clamping shaft 2 enters the female groove 9 to prevent rotation.
(3) When the device is removed, the clamping shaft 2 is pressed down until the protruding part 3 enters the rotating space 8, and then the protruding part is rotated for 90 degrees in the direction opposite to the direction of installation, and after passing through the male groove 7, the whole device and the top supporting plate 6 are separated from the upper surface.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The rotary-buckling type flow channel plugging device of the steam generator is characterized by comprising a clamping shaft and a pressing sleeve, wherein one end of the clamping shaft is connected with a clamping plate, the other end of the clamping shaft penetrates through the pressing sleeve, and a spring which is in butt joint with the pressing sleeve is sleeved on the outer side of the clamping shaft;
The two sides of the clamping shaft are symmetrically provided with convex parts, the outer surface of the pressing sleeve is provided with a male groove, the inner surface of the pressing sleeve is provided with a female groove which forms a set angle with the male groove, and the two sides of the pressing sleeve are provided with overhanging parts; the protruding part is positioned in the male groove to be in a first state, the protruding part is positioned in the female groove to be in a second state, and the clamping shaft is rotated to change the first state into the second state, so that the clamping plate is matched with the extending part of the pressing sleeve to seal the water flowing groove.
2. The rotary-button type flow channel plugging device for the steam generator according to claim 1, wherein a stepped cavity is formed in the pressure sleeve, and the size of the cavity gradually decreases from one end close to the female channel to the other end.
3. The rotary-button type flow channel plugging device for the steam generator according to claim 2, wherein the clamping shaft is circumferentially provided with a first boss, the inner cavity of the pressing sleeve is provided with a second boss, the spring is arranged between the first boss and the second boss, and two ends of the spring are respectively embedded into the clamping groove of the first boss and the clamping groove of the second boss.
4. A steam generator turn-buckle type flow channel plugging device according to claim 3 and wherein said first boss diameter is smaller than both the inner diameter of the first compression space of the press jacket and the length of the boss.
5. The steam generator turn-buckle type flow channel plugging device according to claim 1, wherein the two male channels and the two female channels form a cross structure.
6. The steam generator turnbuckle type flow water trough plugging device according to claim 1, wherein the clamping plate is rectangular, and the extending directions of the two protruding parts are consistent with the width direction of the clamping plate.
7. The steam generator turn-buckle type flow channel plugging device according to claim 1, wherein the cross section of the pressing sleeve is circular.
8. The rotary-button type flow channel plugging device for the steam generator according to claim 1, wherein a surface of the pressing sleeve opposite to the surface of the male channel is provided with a plurality of flow holes.
9. The steam generator turn-buckle type flow channel plugging device according to claim 1, wherein the top of the clamping shaft is provided with a hexagonal head for applying an acting force.
10. The method of using a steam generator turn-buckle type flow channel plugging device according to any one of claims 1 to 9, comprising:
Inserting the plugging device into a water flowing groove, pressing down the clamping shaft to enable the protruding part to pass through the male groove to the cavity in the pressing sleeve, releasing the clamping shaft after rotating the clamping shaft by 90 degrees, fixing the clamping shaft on the top supporting plate under the action force of the spring by the clamping plate and the pressing sleeve, and enabling the protruding part to enter the female groove;
When the plugging device is disassembled, the clamping shaft is pressed down until the protruding part enters the cavity in the pressing sleeve, the clamping shaft is reversely rotated by 90 degrees, and the device and the top supporting plate are separated from each other from the upper surface after the protruding part passes through the male groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607862.5A CN115218172B (en) | 2022-05-31 | 2022-05-31 | Spiral-lock type flow channel plugging device and method for steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607862.5A CN115218172B (en) | 2022-05-31 | 2022-05-31 | Spiral-lock type flow channel plugging device and method for steam generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115218172A CN115218172A (en) | 2022-10-21 |
| CN115218172B true CN115218172B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210607862.5A Active CN115218172B (en) | 2022-05-31 | 2022-05-31 | Spiral-lock type flow channel plugging device and method for steam generator |
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| Country | Link |
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| CN (1) | CN115218172B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8527749D0 (en) * | 1984-11-13 | 1985-12-18 | Westinghouse Electric Corp | Steam generator wrapper closure |
| JP2008311020A (en) * | 2007-06-13 | 2008-12-25 | Nissan Diesel Motor Co Ltd | Connector device |
| KR20110068744A (en) * | 2009-12-14 | 2011-06-22 | (주)코트랩 | Open system with sink |
| CN203658280U (en) * | 2013-12-30 | 2014-06-18 | 中核武汉核电运行技术股份有限公司 | Secondary side tube plate video inspection tool for steam generator |
| CN103868049A (en) * | 2012-12-13 | 2014-06-18 | 中国核动力研究设计院 | Novel supporting device for steam generator heat exchange tubes of pressurized water reactor nuclear power plant |
| CN104749183A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Video inspection tool for secondary side tube plate of steam generator |
| DE202017106212U1 (en) * | 2017-02-28 | 2017-10-19 | Fujian Xihe Sanitary Ware Technology Co., Ltd | Valve |
| CN110895181A (en) * | 2019-12-31 | 2020-03-20 | 中核武汉核电运行技术股份有限公司 | Helium leakage detection sealing plug for welding seam of heat transfer pipe and tube plate of steam generator |
-
2022
- 2022-05-31 CN CN202210607862.5A patent/CN115218172B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8527749D0 (en) * | 1984-11-13 | 1985-12-18 | Westinghouse Electric Corp | Steam generator wrapper closure |
| JP2008311020A (en) * | 2007-06-13 | 2008-12-25 | Nissan Diesel Motor Co Ltd | Connector device |
| KR20110068744A (en) * | 2009-12-14 | 2011-06-22 | (주)코트랩 | Open system with sink |
| CN103868049A (en) * | 2012-12-13 | 2014-06-18 | 中国核动力研究设计院 | Novel supporting device for steam generator heat exchange tubes of pressurized water reactor nuclear power plant |
| CN203658280U (en) * | 2013-12-30 | 2014-06-18 | 中核武汉核电运行技术股份有限公司 | Secondary side tube plate video inspection tool for steam generator |
| CN104749183A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Video inspection tool for secondary side tube plate of steam generator |
| DE202017106212U1 (en) * | 2017-02-28 | 2017-10-19 | Fujian Xihe Sanitary Ware Technology Co., Ltd | Valve |
| CN110895181A (en) * | 2019-12-31 | 2020-03-20 | 中核武汉核电运行技术股份有限公司 | Helium leakage detection sealing plug for welding seam of heat transfer pipe and tube plate of steam generator |
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| CN115218172A (en) | 2022-10-21 |
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