CN210200328U - Nuclear power station pressure vessel flange face protection instrument - Google Patents
Nuclear power station pressure vessel flange face protection instrument Download PDFInfo
- Publication number
- CN210200328U CN210200328U CN201920749231.0U CN201920749231U CN210200328U CN 210200328 U CN210200328 U CN 210200328U CN 201920749231 U CN201920749231 U CN 201920749231U CN 210200328 U CN210200328 U CN 210200328U
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- CN
- China
- Prior art keywords
- pressure vessel
- flange
- protective cover
- cover plate
- nuclear power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
A protection tool for a flange surface of a pressure vessel of a nuclear power station belongs to the technical field of protection of sensitive parts of key equipment during construction of the nuclear power station. The tool comprises a protective cover plate and a fixing component; the protective cover plate is provided with a groove at the sealing surface of the pressure vessel cylinder flange, so that the protective cover plate is fixed at the position of the non-sealing surface of the pressure vessel cylinder flange through a fixing assembly. The utility model is suitable for a do not have the reactor pressure vessel of difference in height container flange face and the sealed face of container flange, simple structure, the shipment is convenient, and the location is reliable.
Description
Technical Field
The utility model belongs to the sensitive position protection field of key equipment during nuclear power station is built, concretely relates to nuclear power station pressure vessel flange face protection instrument.
Background
The pressure vessel is the core equipment of the nuclear power station, and plays roles of reactor support, radioactivity containment and the like. The pressure vessel mainly comprises a top head 10 and a pressure vessel cylinder 20 which are connected through bolts 30, and two metal O-shaped sealing rings 40 are adopted between flange surfaces for sealing, as shown in figure 1 below. In order to prevent leakage, the contact position of the pressure vessel cylinder 20 and the O-shaped sealing ring 40 is a sealing surface position, the surface precision requirement is high, and mechanical damage is not allowed to occur.
During nuclear power construction, due to the requirement of internal construction of the pressure vessel barrel, the pressure vessel top head is arranged at a special storage position of a factory building, the barrel is not connected with the top head, and the pressure vessel barrel is in an open state. In order to prevent the sealing surface of the cylinder flange of the pressure container in an open state from being damaged mechanically during construction, the sealing surface of the cylinder flange is protected by adopting simple annular rubber or polyethylene and other polymer materials.
Because the protection devices are movable, hard foreign matters are introduced between the protection devices and the flange surface of the pressure vessel cylinder body due to construction activities on the periphery of the pressure vessel, and the hard foreign matters can cause mechanical defects such as pits, scratches and the like on the flange sealing surface of the pressure vessel cylinder body. According to the regulation, the damage exceeding 0.076mm in depth needs to be treated, otherwise, the pressure vessel is possibly not tightly sealed at the O-shaped ring after being closed, and the leakage of the reactor coolant is caused. Similar problems arise during construction, which can have an impact on project quality, schedule, cost, etc. Therefore, the invention provides a more reliable protection device for the position of the flange sealing surface of the pressure container, and has important significance for controlling the quality, the progress and the cost of a project.
The utility model discloses a patent CN201720304125.2 discloses reactor pressure vessel flange seal face protection ring to specifically disclose reactor pressure vessel flange including the container flange face that is equipped with first guiding hole and have the container flange seal face of difference in height with the container flange face, wherein, reactor pressure vessel flange seal face protection ring is including laminating on the container flange face and extending the annular plate that covers the container flange seal face, is equipped with the second guiding hole that corresponds with first guiding hole position on the annular plate. The first bottom plate, the second bottom plate and the third bottom plate are fixedly connected through the connecting plates. The utility model discloses a patent is applicable to the reactor pressure vessel who has difference in height container flange face and the sealed face of container flange, and adopts components of a whole that can function independently concatenation formula protection ring, and the concatenation equipment process is loaded down with trivial details, and the leakproofness requires the height to the concatenation precision. The annular plates are assembled on the pressure container in a sealing mode, splicing is needed firstly, then the plates are fixed, sealing can be completed, and the process is complex and inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, provide one kind and can be applicable to the reactor pressure vessel who does not have difference in height container flange face and the sealed face of container flange, and the nuclear power station pressure vessel flange face protection instrument of simple and convenient dismouting of ability.
The utility model discloses a can realize through following technical scheme:
the utility model provides a protection tool for the flange surface of a pressure vessel of a nuclear power station, which comprises a protection cover plate and a fixed component; the protective cover plate is provided with a groove at the sealing surface of the pressure vessel cylinder flange, so that the protective cover plate is fixed at the position of the non-sealing surface of the pressure vessel cylinder flange through a fixing assembly.
Preferably, the protective cover plate comprises an embedding part embedded into the pressure vessel cylinder and a shielding part shielding the flange surface of the pressure vessel cylinder; the shielding part extends downwards at the edge of the pressure vessel cylinder body, so that the fixing component penetrates through the downwards extending part of the shielding part to prop against the side wall of the pressure vessel cylinder body flange.
Preferably, the groove is opened at a position of the shielding portion close to the insertion portion.
Preferably, a gap is left between the downward extending part of the shielding part and the side wall of the pressure vessel cylinder flange.
Preferably, the fixing assemblies are provided with four groups, and the four groups are arranged at four positions of the protective cover plate at 90 degrees with each other.
Preferably, each group of fixing components comprises a fixing bolt, a locking nut and a locknut; the fixing bolt penetrates through the downward extending part of the shielding part and props against the side wall of the flange of the cylinder of the pressure vessel; the locking nut and the anti-loosening nut are sleeved on the fixing bolt and used for locking the fixing bolt for fixing the protective cover plate.
Preferably, the lock nut and the locknut are both arranged between the outer side end of the protection cover body and the fixing bolt.
Preferably, the upper surface of the protective cover plate is provided with a lifting lug.
Preferably, the lifting lug is connected with the protective cover plate through threads.
Preferably, the protective cover plate is of an integrally formed structure.
The utility model discloses following beneficial effect has:
the utility model relates to a nuclear power station pressure vessel flange face protection instrument prevents to appear mechanical damage at sealed face during the construction. In addition, the tool has simple structure, convenient loading and transportation and reliable positioning. Can dismantle lug structure makes things convenient for the peripheral operation of pressure vessel during the protection device use, reduces personnel and collides with, emptys the risk.
Drawings
FIG. 1 is a schematic diagram of a prior art pressure vessel;
FIG. 2 is a top view of the flange surface protection tool for a nuclear power plant pressure vessel according to the present invention;
fig. 3 is a front view of the flange surface protection tool of the pressure vessel of the nuclear power plant in a cross section a-a of fig. 2.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in figures 2 and 3, the utility model relates to a nuclear power station pressure vessel flange face protection instrument, including protection apron 1, fixed subassembly. The protective cover plate 1 is provided with a groove 13 at the sealing surface of the pressure vessel cylinder flange, so that the protective cover plate is fixed at the position of the non-sealing surface of the pressure vessel cylinder flange through a fixing component.
The protective cover plate 1 comprises an embedding part 11 embedded in the pressure vessel cylinder 20 and a shielding part 12 shielding the flange surface of the pressure vessel cylinder. The protective cover 1, as seen in fig. 2, may be shaped like a ring and may cover the entire flange surface. The groove 13 is opened at the position of the shielding part 12 close to the embedding part, that is, at the position of the O-ring 40 in fig. 1, so as to prevent the protective cover plate 1 from directly contacting the flange sealing surface of the pressure vessel cylinder and protect the flange sealing surface of the pressure vessel cylinder from mechanical damage. The protection cover body 1 is made of hard polyethylene materials in a processing mode, the protection cover body 1 can be of an integrally formed structure, and the protection cover body can be quickly assembled on a pressure container barrel.
In order to fix the protective cover plate conveniently, foreign matters are prevented from being introduced below the protective cover plate, and the protective cover plate and the flange surface of the pressure container cylinder are prevented from frequently moving relatively to each other to cause mechanical damage. The shield 12 extends downwardly at the edge of the pressure vessel barrel so that the securing element extends through the downwardly extending portion 121 of the shield and against the pressure vessel barrel flange side wall. In order to adapt to pressure vessel cylinders of different sizes or provide a fixed adjustment margin, a gap is left between the downward extending part 121 of the shielding part 12 and the flange side wall of the pressure vessel cylinder.
The fixed components are provided with four groups, and the four groups are arranged at four positions of the protective cover plate at 90 degrees with each other. Each group of fixing components comprises a fixing bolt 4, a locking nut 2 and a locknut 3. The fixing bolt 4 passes through the downward extending part 121 of the shielding part 12 to press against the side wall of the pressure vessel cylinder flange. The locking nut 2 and the locknut 3 are sleeved on the fixing bolt 4 and used for locking the fixing bolt 4 which fixes the protective cover plate. The locking nut 2 and the locknut 3 are arranged between the outer side end of the protection cover body 1 and the fixing bolt 4. After the protective cover plate is fixed on the pressure vessel cylinder body by the fixing bolt 4, the locking nut 2 and the locknut 3 are screwed to prevent the threaded connection from loosening in the use process, particularly the threaded system is displaced and loosened front and back, and the protective cover plate can be reliably fixed.
For the convenience of hoisting, the upper surface of the protective cover plate 1 is provided with a lifting lug 5. The lifting lug 5 is connected with the protective cover plate 1 through threads, so that the protective cover plate can be used as required, and can be unscrewed and disassembled when not needed and screwed down when needed. The lifting lugs can be arranged in four positions, and are arranged on the protective cover plate 1 at 90 degrees.
The protection tool is used for installation according to the following processes:
1. screwing 4 detachable lifting lugs 5 into the protective cover plate 1 to complete the installation of the lifting lugs;
2. hoisting the protective cover plate 1 in place to the flange surface of the pressure vessel cylinder by hoisting equipment, and adjusting the position of the protective cover plate;
3. after the position of the protective cover plate is adjusted, 4 fixing bolts 4 are installed and screwed in, so that the bolts prop against the side wall of the pressure vessel cylinder flange to fix the protective cover plate;
4. after the cover plate is locked and fixed by the fixing bolt, the locking nut 2 and the locknut 3 are respectively screwed down, so that the looseness of a threaded connection system in the use process is prevented, and the protective cover plate is reliably fixed.
5. After the protective cover plate is fixed, the lifting lugs 5 are removed, and the protective cover plate is installed.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (10)
1. A protection tool for a flange surface of a pressure vessel of a nuclear power station is characterized by comprising a protection cover plate and a fixing component; the protective cover plate is provided with a groove at the sealing surface of the pressure vessel cylinder flange, so that the protective cover plate is fixed at the position of the non-sealing surface of the pressure vessel cylinder flange through a fixing assembly.
2. The nuclear power plant pressure vessel flange face protection tool of claim 1, wherein the protective cover plate includes an insertion portion that is inserted into the pressure vessel cylinder and a shielding portion that shields a flange face of the pressure vessel cylinder; the shielding part extends downwards at the edge of the pressure vessel cylinder body, so that the fixing component penetrates through the downwards extending part of the shielding part to prop against the side wall of the pressure vessel cylinder body flange.
3. The tool of claim 2, wherein the recess is formed in the shroud portion adjacent to the insert portion.
4. The nuclear power plant pressure vessel flange face protection tool of claim 2, wherein a gap is left between the downwardly extending portion of the shield and the pressure vessel barrel flange side wall.
5. The tool of claim 2, wherein the securing assemblies are arranged in four groups at 90 degrees to each other on the protective cover.
6. The tool for protecting the flange surface of the pressure vessel of the nuclear power plant as claimed in claim 5, wherein each group of fixing components comprises a fixing bolt, a locking nut and a locknut; the fixing bolt penetrates through the downward extending part of the shielding part and props against the side wall of the flange of the cylinder of the pressure vessel; the locking nut and the anti-loosening nut are sleeved on the fixing bolt and used for locking the fixing bolt for fixing the protective cover plate.
7. The tool for protecting the flange surface of the pressure vessel of the nuclear power plant as claimed in claim 6, wherein the lock nut and the locknut are both arranged between the outer end of the protective cover plate and the fixing bolt.
8. The tool for protecting the flange surface of the pressure vessel of the nuclear power plant as claimed in claim 1, wherein the upper surface of the protective cover plate is provided with a lifting lug.
9. The tool for protecting the flange face of the pressure vessel of the nuclear power plant as claimed in claim 8, wherein the lifting lug is connected with the protective cover plate through threads.
10. The tool of claim 1, wherein the protective cover is of one-piece construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920749231.0U CN210200328U (en) | 2019-05-23 | 2019-05-23 | Nuclear power station pressure vessel flange face protection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920749231.0U CN210200328U (en) | 2019-05-23 | 2019-05-23 | Nuclear power station pressure vessel flange face protection instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210200328U true CN210200328U (en) | 2020-03-27 |
Family
ID=69875001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920749231.0U Active CN210200328U (en) | 2019-05-23 | 2019-05-23 | Nuclear power station pressure vessel flange face protection instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210200328U (en) |
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2019
- 2019-05-23 CN CN201920749231.0U patent/CN210200328U/en active Active
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