CN210196101U - Shielding and locking device of nuclear power station shielding type main pump - Google Patents
Shielding and locking device of nuclear power station shielding type main pump Download PDFInfo
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- CN210196101U CN210196101U CN201920964051.4U CN201920964051U CN210196101U CN 210196101 U CN210196101 U CN 210196101U CN 201920964051 U CN201920964051 U CN 201920964051U CN 210196101 U CN210196101 U CN 210196101U
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Abstract
The utility model belongs to the technical field of the shielding formula main pump of nuclear power station maintenance, concretely relates to shielding and locking device of shielding formula main pump of nuclear power station under high radioactivity environment. The method comprises the following steps: the cover body, locate shield cover landing leg on the cover body, locate the bolt fastener at the top of the cover body, the end of shield cover landing leg is equipped with the flange connecting piece. Among the above-mentioned technical scheme, the cover body passes through the flange joint of shield cover landing leg and shielding formula main pump to on installing the main pump, realize the radioactive shielding to the impeller subassembly of shielding formula main pump, and realize the locking of main pump rotor subassembly through the bolt assembly at cover body top, establish the basis for the hoist and mount and the transportation work of main pump.
Description
Technical Field
The utility model belongs to the technical field of the shielding formula main pump of nuclear power station maintenance, concretely relates to shielding and locking device of shielding formula main pump of nuclear power station under high radioactivity environment.
Background
After the nuclear power plant runs for a long time, the possibility that other parts such as a thrust bearing and a shielding sleeve of the main pump have problems is gradually increased, so that the development of maintenance processes and tools for replacing the main pump and the like in a radioactive environment is very necessary.
The shielding main pump is inversely arranged at the bottom of the evaporator, when the damaged main pump is integrally removed from the pump shell, parts such as a pump impeller and the like are directly exposed in the environment, the environmental dosage is very high, and the subsequent maintenance work such as hoisting, overturning, transferring and the like of the shielding main pump is seriously influenced; in addition, in the processes of hoisting, overturning and transporting of the shielding main pump, in order to prevent the rotor from moving and damaging components such as a thrust bearing assembly and the like, a rotor assembly of the shielding main pump needs to be locked before the main pump is overturned; therefore, effective shielding of the pump impeller portion and locking of the rotor assembly is necessary.
Through comprehensive analysis of site working conditions, a shielded main pump structure and a dismounting and mounting process, the limiting factors in the prior art are as follows: (1) the space of a cavity of the shielding main pump is limited, the pump needs to fall, and locking of a rotor assembly of the shielding main pump and installation of an impeller shielding device are realized after the pump moves to a hoisting port; (2) the shielded main pump lifting channel is narrow in space, a rotor locking device, an impeller shielding case and a main lifting appliance need to be integrally installed, the installation of the main lifting appliance cannot be interfered after the rotor locking device and the impeller shielding case are installed, and the overall dimensions of the rotor locking device and the impeller shielding case cannot exceed the overall dimensions of the main lifting appliance; (3) the impeller of the shielding main pump is directly connected with a loop, and the dosage of radioactive environment is high; (4) the shielding main pump impeller has residual radioactive medium, and the leakage risk exists.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one of the above-mentioned technical problem, the utility model provides a shielding and locking device of nuclear power station shielding formula main pump, a serial communication port, include:
the cover body, locate shield cover landing leg on the cover body, locate the bolt fastener at the top of the cover body, the end of shield cover landing leg is equipped with the flange connecting piece.
Among the above-mentioned technical scheme, the cover body passes through the flange joint of shield cover landing leg and shielding formula main pump to on installing the main pump, realize the radioactive shielding to the impeller subassembly of shielding formula main pump, and realize the locking of main pump rotor subassembly through the bolt assembly at cover body top, establish the basis for the hoist and mount and the transportation work of main pump.
Preferably, the shield leg is plural and evenly distributed on the outer wall circumference of the shield body.
Preferably, the tail ends of the supporting legs of the shielding case are provided with connecting plates, and the connecting plates are provided with flange connecting holes. Bolts pass through the flange connecting holes and the main pump flange to connect the support legs of the shielding cover and the main pump flange together.
Preferably, the top of the cover body is provided with a concave platform, and the bolt fastener is arranged in the concave platform. The bolt fastener is prevented from protruding out of the top of the cover body, and the bolt fastener is easy to protect.
Preferably, the periphery of the top cover plate is provided with a cover body connecting plate; and cover plate connecting pieces corresponding to the cover body connecting plates are arranged on the periphery of the concave table at the top of the cover body. The top cover plate is arranged at the top of the cover body, so that the top shielding function of the cover body can be enhanced.
Preferably, the top of the cover body is further provided with a top sealing ring, the top sealing ring is located around the concave table, and the top cover plate presses on the top sealing ring to seal the cover body.
Preferably, a bottom sealing ring is embedded in the bottom surface of the cover body.
Preferably, two bottom sealing rings are embedded in the bottom surface of the cover body.
Preferably, the cover body comprises a bottom cylinder, a middle cylinder and a top cover body which are sequentially connected from bottom to top; the bottom cylinder body is an equal-diameter cylinder, the middle cylinder body is a cylinder body which is reduced in diameter from bottom to top, and the top cover body is a cover body which is reduced in diameter from bottom to top. The structure is more compact, and the installation of the main pump tool can be met.
Preferably, at least three of the shield legs are evenly distributed along the circumference of the outer wall of the middle cylinder.
The utility model has the advantages as follows:
(1) the radioactive shielding of the impeller assembly is realized through the shielding cover and the top cover plate;
(2) the locking of the rotor assembly of the main pump is realized through the locking assembly at the top of the cover body, and a foundation is laid for the hoisting and transportation work of the main pump;
(3) the top sealing ring and the bottom sealing ring realize the sealing of the pump impeller part and prevent the radioactive medium which is not completely dredged by the pump impeller part from flowing out.
Drawings
Fig. 1 the utility model discloses shielding and locking device's of nuclear power station shielding formula main pump structure stereogram.
Fig. 2 is a plan view of a shielding and locking device of a nuclear power station shielding type main pump according to the first embodiment of the present invention.
Fig. 3 is a bottom view of the shielding and locking device of the nuclear power station shielding type main pump of the first embodiment of the present invention.
Fig. 4 is a three-dimensional structure diagram of the shielding and locking device of the nuclear power station shielding type main pump, which is not provided with the top cover plate.
Fig. 5 is a side sectional view of the first cover body of the shielding type main pump of the nuclear power plant.
Detailed Description
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that the conventional terms should be interpreted as having a meaning that is consistent with their meaning in the relevant art and this disclosure. This disclosure is to be considered as an example of the invention and is not intended to limit the invention to the particular embodiments.
Example one
The shielding and locking device for the shielding type main pump of the nuclear power plant as shown in fig. 1 to 5 comprises a cover body 4, a shielding cover leg 2 arranged on the cover body 4, and a bolt fastener 10 arranged at the top of the cover body 4.
The cover body 4 is used for being installed on a pump body of the canned motor pump, and an impeller assembly of the canned motor pump is covered in the cover body 4 so as to achieve radioactive shielding of the impeller assembly. The shield legs 2 are provided in plurality and are evenly distributed around the circumference of the outer wall of the shield 4. The supporting legs 2 of the shielding case can be a bracket consisting of two connecting rods, and one end of the bracket is welded with a connecting plate for connecting the outer wall of the cover body 4 by bolts; the other end of the support is welded with a connecting plate for connecting the cover body through bolts, flange connecting holes are formed in the connecting plate, and the bolts penetrate through the flange connecting holes and holes of a pump body main flange of the canned motor pump so as to connect the supporting legs of the canned motor cover and the pump body main flange 1. In order to protect the surface of the main flange 1 of the pump body from being abraded, a gasket 8 is arranged at the connecting position of the main flange of the pump body and the supporting leg of the shielding cover, and when the main flange of the pump body is connected with the supporting leg of the shielding cover, the gasket 8 is padded between the main flange of the pump body and the connecting plate at the tail end of the supporting leg 2 of the shielding cover.
In order to prevent the radioactive medium of the impeller assembly from leaking from the gap between the cover body 4 and the main flange of the pump body, two O-shaped bottom sealing rings 411 are embedded in the bottom surface of the cover body 4 in the embodiment, and after the shielding cover supporting legs 2 are connected and locked with the main flange of the pump body, the O-shaped sealing rings can seal the bottom of the cover body, so that the radioactive medium which is not completely scattered and discharged by the impeller assembly of the shielding pump is prevented from flowing out.
The top of the cover body 4 is provided with a circular concave platform 9, and a bolt fastener 10 is arranged in the concave platform 9 and used for locking a rotor assembly of the shielding pump. A top cover plate 5 is also arranged on the top of the cover body 4. The top cover plate 5 is a circular plate with the diameter larger than that of the concave platform 9, and cover body connecting plates 6 used for connecting the cover body 4 are arranged around the top cover plate 5. The top of the cover 4 is provided with a plurality of cover plate connectors 7, such as screw holes, around the recessed platform 9 for connecting cover connection plates, and bolts are passed through the cover connection plates 6 to connect the cover plate connectors 7, thereby mounting the top cover plate 5 over the recessed platform 9. The top of the cover 4 is further provided with a top sealing ring 431, the top sealing ring 431 is located around the recessed platform 9, and the top cover plate 5 presses on the top sealing ring 431 to realize the sealing of the top of the cover 4.
As shown in fig. 5, the cover 4 in this embodiment includes a bottom cylinder 41, a middle cylinder 42, and a top cover 43 connected in sequence from bottom to top. The bottom cylinder 41 is a cylinder with an equal diameter, the middle cylinder 42 is a cylinder with a diameter reduced from bottom to top, and the top cover 43 is a cover with a diameter reduced from bottom to top. Two bottom sealing rings 411 are arranged at the bottom edge of the bottom cylinder 41, and at least three shielding shell legs 2 are uniformly distributed along the circumference of the outer wall of the middle cylinder 42.
The use method of the shielding and locking assembly of the embodiment comprises the following steps:
the main pump is wholly demolishd and is removed to the hoist and mount mouth after, hangs the installation cover body 4 through the factory building ring: the base plate 8 is arranged between the shielding cover supporting leg 2 and the pump body main flange, and the shielding cover supporting leg and the pump body main flange are connected together through bolts, so that two bottom sealing rings 431 at the bottom of the cover body 4 are fully compressed, the sealing of the lower part of the cover body 4 can be realized, and meanwhile, partial radioactive dose at the impeller of the shielding pump is effectively shielded. The rotor assembly of the canned motor pump is then lifted into position by the plant ring crane mounting bolt fasteners 10. And then, a top cover plate 5 is installed through a factory building ring crane, a top sealing ring 411 of the cover body 4 is compressed by the weight of the top cover plate, and the top cover plate 5 is connected with the top of the cover body 4 through a bolt, so that the upper part of the cover body is sealed.
Although embodiments of the present invention have been described, various changes or modifications may be made by one of ordinary skill in the art within the scope of the appended claims.
Claims (10)
1. Shielding and locking device of nuclear power station shielding formula main pump, its characterized in that includes:
the cover body, locate shield cover landing leg on the cover body, locate the bolt fastener at the top of the cover body, the end of shield cover landing leg is equipped with the flange connecting piece.
2. The shielding and locking device for a nuclear power plant shielded main pump according to claim 1, wherein:
the shield leg is multiple and evenly distributed on the outer wall circumference of the cover body.
3. The shielding and locking device for a nuclear power plant shielded main pump according to claim 1, wherein:
the tail ends of the supporting legs of the shielding cases are provided with connecting plates, and the connecting plates are provided with flange connecting holes.
4. The shielding and locking device for a nuclear power plant shielded main pump according to claim 1, wherein:
the top of the cover body is provided with a concave table, and the bolt fastener is arranged in the concave table.
5. The apparatus for shielding and locking a nuclear power plant shielded main pump according to claim 4, further comprising:
the periphery of the top cover plate is provided with a cover body connecting plate;
and cover plate connecting pieces corresponding to the cover body connecting plates are arranged on the periphery of the concave table at the top of the cover body.
6. The shielding and locking device for a shielded main pump of a nuclear power plant as claimed in claim 5, wherein:
the top of the cover body is also provided with a top sealing ring, the top sealing ring is positioned around the concave table, and the top cover plate is pressed on the top sealing ring to seal the cover body.
7. The shielding and locking device for a nuclear power plant shielded main pump according to claim 6, wherein:
and a bottom sealing ring is embedded in the bottom surface of the cover body.
8. The shielding and locking device for a nuclear power plant shielded main pump according to claim 7, wherein:
the bottom surface of the cover body is embedded with two bottom sealing rings.
9. The shielding and locking device for a nuclear power plant shielded main pump according to claim 7, wherein:
the cover body comprises a bottom cylinder, a middle cylinder and a top cover body which are sequentially connected from bottom to top;
the bottom cylinder body is an equal-diameter cylinder, the middle cylinder body is a cylinder body which is reduced in diameter from bottom to top, and the top cover body is a cover body which is reduced in diameter from bottom to top.
10. The shielding and locking device for a shielded main pump of a nuclear power plant as claimed in claim 9, wherein:
at least three shielding cover supporting legs are uniformly distributed along the circumference of the outer wall of the middle cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920964051.4U CN210196101U (en) | 2019-06-25 | 2019-06-25 | Shielding and locking device of nuclear power station shielding type main pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920964051.4U CN210196101U (en) | 2019-06-25 | 2019-06-25 | Shielding and locking device of nuclear power station shielding type main pump |
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| Publication Number | Publication Date |
|---|---|
| CN210196101U true CN210196101U (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920964051.4U Active CN210196101U (en) | 2019-06-25 | 2019-06-25 | Shielding and locking device of nuclear power station shielding type main pump |
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| CN (1) | CN210196101U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963486A (en) * | 2020-06-09 | 2020-11-20 | 三门核电有限公司 | Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment |
-
2019
- 2019-06-25 CN CN201920964051.4U patent/CN210196101U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963486A (en) * | 2020-06-09 | 2020-11-20 | 三门核电有限公司 | Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment |
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