CN218376586U - Negative pressure sealing tool - Google Patents
Negative pressure sealing tool Download PDFInfo
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- CN218376586U CN218376586U CN202222818660.3U CN202222818660U CN218376586U CN 218376586 U CN218376586 U CN 218376586U CN 202222818660 U CN202222818660 U CN 202222818660U CN 218376586 U CN218376586 U CN 218376586U
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- negative pressure
- sealing
- positioning portion
- pipeline
- sealing element
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Abstract
A negative pressure sealing tool is used for sealing a leakage port of a pipeline when the pipeline is in a negative pressure state; the negative pressure sealing tool comprises a first sealing element and a second sealing element, and the first sealing element is used for at least sealing and covering the leakage port and is fixed with the pipeline; the first sealing element is provided with a negative pressure channel which is used for communicating the inside and the outside of the pipeline, so that the first sealing element is conveniently in sealing connection with the leakage opening, the second sealing element is arranged on one side of the first sealing element, which is back to the leakage opening, and the second sealing element is used for sealing the negative pressure channel, so that the leakage opening is completely sealed; this setting can seal the leakage opening under the condition of not destroying pipeline atmospheric pressure for the unit can not the degree of depth move back the state, shut down and pile.
Description
Technical Field
The application relates to the field of nuclear power stations, in particular to a negative pressure sealing tool.
Background
In a nuclear power station, regarding a steam turbine application area, when a pipeline which is communicated with a steam turbine and is indirectly communicated with a condenser is broken due to accidents to cause steam leakage, the vacuumizing speed of a vacuum pump is lower than the air sucking speed of a broken pipeline opening, the vacuum degrees of the steam turbine and the condenser are damaged, so that a unit is deeply retreated, and the unit is shut down and stopped to cause loss.
SUMMERY OF THE UTILITY MODEL
The application provides a sealed frock of negative pressure, aims at not destroying under the atmospheric pressure in the pipeline, realizes the shutoff to pipeline fracture department, makes the unit can not degree of depth retreat the state, shuts down, stops piling.
A negative pressure sealing tool is used for sealing a leakage opening of a pipeline when the pipeline is in a negative pressure state; the negative pressure sealing tool comprises:
the first sealing element is used for at least sealing and covering the leakage port and is fixed with the pipeline; the first sealing element is provided with a negative pressure channel which is used for communicating the inside and the outside of the pipeline; and
and the second sealing piece is arranged on one side of the first sealing piece, which is back to the leakage port, and is used for sealing the negative pressure channel.
In one embodiment, the first seal comprises:
a first positioning portion disposed through the leak port or at least partially inserted into the leak port; and
the first connecting part is arranged at one end of the first positioning part and covers the leakage port; the negative pressure channel penetrates through the first connecting part and the first positioning part, and the second sealing element is fixedly connected with the first connecting part so as to cover the leakage port.
In one embodiment, the first positioning portion is a tapered cylinder structure, and the first connecting portion is disposed at a tapered bottom end of the first positioning portion.
In one embodiment, the cross-sectional shape of the first detent is configured to match the profile shape of the leak port to enable the first detent to seal off the leak port.
In one embodiment, a fillet weld fixing structure is arranged between the first positioning part and/or the first connecting part and the pipeline.
In one embodiment, the second seal comprises:
the second positioning part is inserted in the negative pressure channel; and
a second connecting portion provided at one end of the second positioning portion; the second connecting portion covers a port arrangement of a negative pressure passage and is fixed with the first sealing member to seal the negative pressure passage.
In one embodiment, the negative pressure channel has a communicating section and an accommodating section which are communicated with each other, the inner diameter of the communicating section is smaller than that of the accommodating section, the accommodating section is used for accommodating the second positioning portion, and the second connecting portion covers a port of one end, far away from the communicating section, of the accommodating section.
In one embodiment, the cross-sectional shape of the accommodating section is matched with that of the second positioning part, so that the second positioning part can block the negative pressure channel.
In one embodiment, a fillet weld fixing structure is arranged between the second connecting part and the first sealing element.
In one embodiment, the minimum inner diameter of the negative pressure channel is 8mm.
According to the sealed frock of negative pressure that above-mentioned embodiment provided, carry out preliminary cover with the leakage opening on first sealing member and the pipeline and seal, wherein, set up negative pressure channel on the first sealing member, this negative pressure channel is used for inside and outside of intercommunication pipeline, and the speed that negative pressure channel inhales gas is far less than the speed of evacuation in the pipeline, so this design has both realized first sealing member and has sealed the leakage opening of pipeline for the first time, can not cause the destruction to the vacuum in the pipeline at sealed in-process simultaneously, thereby avoid the unit to go wrong.
Then seal negative pressure pipeline through the second sealing member, carry out secondary seal to the leakage opening of pipeline promptly to seal up the leakage opening of pipeline completely, guarantee whole unit normal operating.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a cross-sectional view of an embodiment.
The reference numerals in the figures are as follows:
1. a pipeline; 2. a first seal member; 21. a first positioning portion; 22. a first connection portion; 23. a negative pressure channel; 231. a conducting section; 232. a housing section; 3. a second seal member; 31. a second positioning portion; 32. a second connecting portion.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments, and the operation steps involved in the embodiments may be interchanged or modified in order as will be apparent to those skilled in the art. Accordingly, the description and drawings are merely for clarity of description of certain embodiments and are not intended to necessarily refer to a required composition and/or order.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified.
The application provides a negative pressure sealing tool for sealing leakage ports on pipelines communicated with a steam turbine and indirectly communicated with a condenser; in the existing scene, when the power of a steam turbine is 394MW, a pipeline for connecting a blind flange and the steam turbine leaks steam due to accidental breakage, and a breakage port (leakage port) of the pipeline is a connection part with the blind flange, so that the steam turbine is forced to be braked and stopped; at this moment, in order to avoid the structure, namely the vacuum of the steam turbine and the condenser being damaged, and the nuclear power shutdown is caused, namely the consequence that the unit can be deeply retreated, shut down and shut down, the vacuum pump needs to be rapidly started, and the vacuum pump extracts the gas in the condenser and the pipeline communicated with the steam turbine, so that the condenser and the steam turbine are in a vacuum state as much as possible. Therefore, the leakage port is sealed and welded by utilizing the principle that the vacuumizing speed of the vacuum pump is far higher than the vacuum failure speed during welding of the negative pressure tool; through set up negative pressure structure on the sealing member promptly for when sealing member and leakage opening are sealed, can guarantee the vacuum in the pipeline, both realized the sealing member to leakage opening's sealed, can not cause the destruction to the vacuum in the pipeline at sealed in-process simultaneously.
A negative pressure sealing tool, please refer to fig. 1, which is used for sealing a leakage port of a pipeline 1 when the pipeline 1 is in a negative pressure state; wherein, the pipeline 1 is a pipeline 1 communicated with the blind flange and the steam turbine; the negative pressure sealing tool comprises a first sealing element 2 and a second sealing element 3, wherein the first sealing element 2 is used for primarily sealing a leakage port; the second sealing element 3 is used for secondary sealing of the leakage port, so that complete sealing of the leakage port is realized, and the specific contents are as follows:
in one embodiment, referring specifically to fig. 1 and 2, the first sealing element 2 is used to at least seal and cover the leakage port and is fixed to the pipe 1; the first sealing element 2 is provided with a negative pressure channel 23, and the negative pressure channel 23 is used for communicating the inside and the outside of the pipeline 1, so that the first sealing element 2 and a leakage port can be conveniently connected in a sealing manner; the first sealing element 2 includes a first positioning portion 21 and a first connecting portion 22, the first connecting portion 22 is disposed at one end of the first positioning portion 21 and covers the leakage port; the first positioning portion 21 is disposed through the leakage port, or at least partially inserted into the leakage port, that is, when the first positioning portion 21 is used to seal the leakage port, the whole body structure of the first positioning portion 21 may be selectively inserted into the leakage port to block the leakage port, and then the first connecting portion 22 connected to the first positioning portion is fixedly connected to the outer wall surface of the leakage port, so as to realize the primary sealing between the first sealing member 2 and the leakage port; in other embodiments, the first positioning portion 21 may also be selected to plug a part of the main body structure with the leakage port, and then the first connecting portion 22 is fixedly connected to the outer wall surface of the leakage port together with the non-plugged peripheral surface of the first positioning portion 21, so as to achieve the primary sealing of the first sealing member 2 and the leakage port.
Further describing the first positioning portion 21 and the first connecting portion 22 in the first sealing member 2, the first positioning portion 21 is a tapered cylinder structure with a shape designed to facilitate the insertion of the first positioning portion 21 into the leakage port; the first connecting portion 22 is disposed at the bottom end of the first positioning portion 21, on one hand, the first connecting portion 22 can be used as a handheld member on the first positioning portion 21 to help the first positioning portion 21 to be inserted into the leakage port; on the other hand, the first connecting portion 22 is mainly used for connecting with the outer wall of the leakage port, so as to stabilize the position of the first positioning portion 21 and simultaneously cooperate with the second sealing member 3 to secondarily seal the leakage port; in another embodiment, the first sealing element 2 may only include the first positioning portion 21, and the first positioning portion 21 is also a tapered cylinder structure, but different from the above, after the first positioning portion 21 is connected with the leakage port in a sealing manner, the tapered bottom end of the first positioning portion 21 is in the pipeline 1, the tapered top end of the first positioning portion is outside the leakage port, and the tapered surface of the first positioning portion 21 is connected with the inner wall surface of the leakage port in an interference fit manner.
Further, the cross-sectional shape of the first positioning portion 21 may also be configured to match the profile shape of the leakage port, so that the first positioning portion 21 can block the leakage port; for example, the cross-sectional shape of the first positioning portion 21 is a rectangle, an irregular shape, or the like, and overall, the first positioning portion 21 is a structure body that can be inserted into and completely fitted to the leak port.
In the present application, the negative pressure passage 23 is provided to penetrate the first connecting portion 22 and the first positioning portion 21, and the negative pressure passage 23 has a communicating section 231 and a receiving section 232; the conducting section 231 is provided through the first positioning portion 21, and the accommodating section 232 is provided through the first connecting portion 22; the inner diameter of the conducting section 231 is smaller than that of the accommodating section 232, wherein the speed of air entering is far smaller than the speed of vacuumizing in the pipeline 1, so that the negative pressure in the pipeline 1 is relatively stable, and the first sealing element 2 is directly connected with the leakage port in a primary sealing mode.
Secondly, the accommodating section 232 in the negative pressure channel 23 is used for accommodating the second sealing element 3, that is, the second sealing element 3 covers the port of the end of the accommodating section 232 far away from the conducting section 231 and is used for sealing the accommodating section 232, that is, the negative pressure channel 23, so as to realize complete sealing of the leakage port.
In other embodiments, the negative pressure channel 23 may have no area segments, i.e. a negative pressure channel 23 having only one inner diameter runs through the first seal 2, communicating the interior and exterior of the duct 1; at this time, the second sealing element 3 is used for being in sealing connection with the opening end of the negative pressure channel 23, which is positioned at one end of the first sealing element 2 far away from the leakage port, so that the leakage port is completely sealed; compared with the scheme, the scheme has the advantages of simple processing and no need of manufacturing the complete negative pressure channel 23 in multiple times.
Therefore, the inner diameter of the negative pressure channel 23 is 8mm at the minimum, that is, the inner diameter of the conducting section 231, or the inner diameter of the negative pressure channel 23 without area segments, and the negative pressure condition inside the negative pressure pipeline 1 can be best maintained at the inner diameter.
The second sealing element 3 is arranged on one side of the first sealing element 2, which faces away from the leakage port, and the second sealing element 3 is used for sealing the negative pressure channel 23; the second sealing member 3 includes a second positioning portion 31 and a second connecting portion 32, the second positioning portion 31 is inserted in the negative pressure channel 23, and the second connecting portion 32 is provided at one end of the second positioning portion 31; the second connecting portion 32 is arranged to cover a port of the negative pressure passage 23 and is fixed with the first sealing member 2 to seal the negative pressure passage 23; that is, the second positioning portion 31 is sealed in the accommodating section 232 in the negative pressure channel 23, and the second connecting portion 32 is fixedly connected to the end surface of the first connecting portion 22 on the first sealing member 2, which is far away from the leakage port, so as to realize the sealing of the negative pressure channel 23 by the second sealing member 3, that is, complete sealing of the leakage port.
Further, the second positioning portion 31 and the receiving section 232 are configured to be capable of fitting with each other in the present application, in other words, the cross-sectional shape of the receiving section 232 needs to match the cross-sectional shape of the second positioning portion 31, so as to ensure that the negative pressure channel 23 is blocked by the second positioning portion 31.
In other embodiments, the second positioning portion 31 can also be directly connected with the open end of the negative pressure channel 23 without the sub-area in a sealing manner, and then the second connecting portion 32 is also fixedly connected with the end face, away from the leakage port, of the first connecting portion 22 on the first sealing member 2, so as to achieve the sealing of the leakage port by the second sealing member 3.
In the above description, the first sealing member 2 is connected to the leakage port in a sealing manner, and the second sealing member 3 is connected to the first sealing member 2 in a sealing manner, in this application, the first positioning portion 21 and/or the first connecting portion 22 on the first sealing member 2 and the outer wall surface of the leakage port on the pipeline 1 have a fillet weld fixing structure, that is, the first sealing member 2 is connected to the outer wall surface of the leakage port through a fillet weld, in other embodiments, other welding schemes may be adopted, and detailed description is not given here.
Similarly, a fillet weld fixing structure is arranged between the second positioning part 31 and/or the second connecting part 32 on the second sealing member 3 and the first sealing member 2, so as to realize the sealing of the negative pressure pipeline 1, namely the complete sealing of a leakage port.
Further, the negative pressure sealing tool designed by the application is light in weight, after a leakage port is sealed, the stress of the pipeline 1 at the position is correspondingly lower than that of other parts of the pipeline 1, and the shock resistance and the strength at the position are in accordance with standards.
The utility model provides a concrete operation mode, at first peg graft in the leakage opening with the first sealing member 2 that has negative pressure channel 23, be used for blockking up the leakage opening, then through the outer wall fixed connection of the global of first connecting portion 22 and/or first location portion 21 on the first sealing member 2 of welded mode with the leakage opening, peg graft second sealing member 3 in the inside open end of pipeline is kept away from to negative pressure channel 23, and with first connecting portion 22 fixed connection on second sealing member 3 and the first sealing member 2 through the welded mode, thereby realize complete sealed leakage opening, the welding of last negative pressure seal frock is accomplished the back, start-up steam turbine, let entire system continue normal operating.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (10)
1. The negative pressure sealing tool is characterized by being used for sealing a leakage port of a pipeline (1) when the pipeline (1) is in a negative pressure state; the negative pressure sealing tool comprises:
a first sealing element (2), wherein the first sealing element (2) is used for at least sealing and covering the leakage port and is fixed with the pipeline (1); the first sealing element (2) is provided with a negative pressure channel (23), and the negative pressure channel (23) is used for communicating the inside and the outside of the pipeline (1); and
a second sealing element (3), wherein the second sealing element (3) is arranged on one side of the first sealing element (2) facing away from the leakage opening, and the second sealing element (3) is used for sealing the negative pressure channel (23).
2. The sealing tool according to claim 1, characterized in that the first seal (2) comprises:
a first positioning portion (21), wherein the first positioning portion (21) is arranged through the leakage port or at least partially inserted into the leakage port; and
a first connecting portion (22), wherein the first connecting portion (22) is arranged at one end of the first positioning portion (21) and covers the leakage port; the negative pressure channel (23) penetrates through the first connecting portion (22) and the first positioning portion (21), and the second sealing element (3) is fixedly connected with the first connecting portion (22) so as to cover the leakage port.
3. The seal tool according to claim 2, wherein the first positioning portion (21) is a tapered cylinder structure, and the first connecting portion (22) is disposed at a tapered bottom end of the first positioning portion (21).
4. The seal tooling of claim 3, wherein the cross-sectional shape of the first detent (21) is configured to match the profile shape of the leak port to enable the first detent (21) to seal off the leak port.
5. The sealing tool according to claim 2, wherein a fillet weld fixing structure is arranged between the first positioning portion (21) and/or the first connecting portion (22) and the pipeline (1).
6. The sealing tool according to claim 1, characterized in that the second seal (3) comprises:
a second positioning portion (31), the second positioning portion (31) being inserted into the negative pressure channel (23); and
a second connecting portion (32), the second connecting portion (32) being provided at one end of the second positioning portion (31); the second connecting portion (32) covers the port arrangement of the negative pressure channel (23) and is fixed with the first sealing member (2) to seal the negative pressure channel (23).
7. The sealing tool according to claim 6, wherein the negative pressure channel (23) has a conducting section (231) and a receiving section (232) which are communicated with each other, the inner diameter of the conducting section (231) is smaller than that of the receiving section (232), the receiving section (232) is used for receiving the second positioning portion (31), and the second connecting portion (32) is arranged to cover a port of one end, away from the conducting section (231), of the receiving section (232).
8. The sealing tool according to claim 7, characterized in that the cross-sectional shape of the receiving section (232) is matched with the cross-sectional shape of the second positioning portion (31) so that the second positioning portion (31) can block the negative pressure channel (23).
9. The sealing tool according to claim 6, characterized in that a fillet weld fixing structure is arranged between the second connecting part (32) and the first sealing element (2).
10. The sealing tool according to claim 1, characterized in that the minimum inner diameter of the negative pressure channel (23) is 8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222818660.3U CN218376586U (en) | 2022-10-24 | 2022-10-24 | Negative pressure sealing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222818660.3U CN218376586U (en) | 2022-10-24 | 2022-10-24 | Negative pressure sealing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218376586U true CN218376586U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222818660.3U Active CN218376586U (en) | 2022-10-24 | 2022-10-24 | Negative pressure sealing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218376586U (en) |
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2022
- 2022-10-24 CN CN202222818660.3U patent/CN218376586U/en active Active
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