CN114352576A - Heat shield of modular small reactor shielding type nuclear main pump - Google Patents
Heat shield of modular small reactor shielding type nuclear main pump Download PDFInfo
- Publication number
- CN114352576A CN114352576A CN202111549336.XA CN202111549336A CN114352576A CN 114352576 A CN114352576 A CN 114352576A CN 202111549336 A CN202111549336 A CN 202111549336A CN 114352576 A CN114352576 A CN 114352576A
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- CN
- China
- Prior art keywords
- heat shield
- cover plate
- guide vane
- heat
- inlet guide
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009413 insulation Methods 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000002826 coolant Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The invention relates to a heat shield of a modularized small-sized reactor shielding type nuclear main pump, wherein a heat shield cover plate (81) and an inlet guide vane (82) are welded and fixed together through two circumferential weld joints (85), an air heat insulation cavity (84) is formed between the heat shield cover plate (81) and the inlet guide vane (82), a through shaft hole (86) is formed in the center of the inlet guide vane (82), a heat insulation sealing groove (83) is arranged at the position, close to the heat shield cover plate (81), of the through shaft hole (86), the heat insulation sealing groove (83) adopts a classical labyrinth groove structure, and the heat shield cover plate (81) and the inlet guide vane (82) are integrally fixed on a stator seal head (2) through a heat shield fastening bolt (3). The invention can effectively block the heat transfer from the lateral side of the pump shell to the motor side, has the characteristics of compact structure, safety, reliability and the like, and is suitable for modularized small reactor main pumps and reactor main pumps with the same requirements on small space and high reliability.
Description
Technical Field
The invention relates to a heat shield of a modular small-sized reactor shielding type nuclear main pump.
Background
The shielded nuclear main pump is a pump used for driving coolant to circulate in a reactor coolant system, is a heart part in a nuclear island, and has the characteristic of high temperature, and when the reactor coolant passes through the pump, the high temperature is gradually transmitted to a motor side part through a metal structural part in contact with the reactor coolant, so that the critical part of the motor fails due to the temperature rise, and a heat shield is required to isolate heat transmission between the pump and the motor. At present, nuclear main pump heat screen is for reaching thermal-insulated, withstand voltage effect, some adopt the inner chamber to strengthen the skeleton, through improving structural strength, reduce heat screen body thickness, reduce area of contact and then improve thermal-insulated effect, some adoption long neck necking down structure, reduce heat transfer and then improve thermal-insulated effect through reducing air heat screen heat conduction area, some adoption multilayer thermal-insulated structure, through the space between multilayer structure, the principle that hinders heat according to reflection radiant heat and intermediate layer gas reaches thermal-insulated effect, all have the structure complicacy, characteristics that occupation space is big. The structure can meet the requirement of conventional design, but is not suitable for the design concept of modular small-sized stacks. The heat shield of the modularized small reactor core main pump has the characteristics of being more reliable, more compact and safer on the basis of completing the heat insulation function.
The invention content is as follows:
the invention aims to provide a heat shield of a modular small reactor shielding type nuclear main pump, which has the characteristics of simple structure, easiness in installation, compact structure, high reliability and the like, ensures the heat insulation function of the main pump, and is also suitable for the overall design of the modular small reactor.
The technical scheme of the invention is as follows: a heat shield of a modularized small-sized stack shielding type nuclear main pump, a heat shield cover plate (81) and an inlet guide vane (82) are welded and fixed together through two girth welding seams (85), an air heat insulation cavity (84) is formed between the heat shield cover plate (81) and the inlet guide vane (82), a through shaft hole (86) is formed in the center of the inlet guide vane (82), a heat insulation sealing groove (83) is arranged at the position, close to the heat shield cover plate (81), of the through shaft hole (86), the heat insulation sealing groove (83) adopts a classic labyrinth groove structure, the heat shield cover plate (81) and the inlet guide vane (82) are integrally fixed on a stator seal head (2) through a heat shield fastening bolt (3), a sealing gasket (6) is arranged between the stator seal head (2) and the heat shield cover plate (81), a motor (1), the stator seal head (2) and a pump shell (7) are laminated together in sequence, one end of a main bolt (4) is fixed on the pump shell (7) through threads, the main bolt (4) penetrates through the other end of the motor (1) and is fixed with the main nut (5) through threads.
The working principle of the invention is as follows:
when the shielding type nuclear main pump operates in a hot state, the heat shield blocks the high-temperature reactor coolant on the pump shell side from transferring heat to the motor side. The air heat insulation cavity formed between the heat shield cover plate and the inlet guide vane utilizes the characteristic of low air heat conductivity coefficient to isolate most of heat transferred by a heat conduction mode. The position that leads to the shaft hole and be close to the heat screen is equipped with thermal-insulated seal groove (83), reduces the reactor coolant to the motor side flow through classic labyrinth groove structure, and seal ring (6) separation coolant that rethread stator head (2) and be equipped with between the heat screen apron gives the motor side heat transfer through the mode of thermal convection.
The technical effects are as follows:
the heat shield with the structure is used for heat insulation of the pump shell and the motor of the small reactor shielding type nuclear main pump. The specific heat shield structure is that the heat shield cover plate and the inlet guide vane are welded and fixed together through two circular weld joints, an air heat insulation cavity is formed in the middle, a through shaft hole is formed in the center of the inlet guide vane, a position, close to the heat shield, of the through shaft hole is provided with a heat insulation sealing groove, the heat insulation sealing groove adopts a classic labyrinth groove structure, the heat shield cover plate and the inlet guide vane are integrally fixed on a stator sealing head through a heat shield fastening bolt, a sealing gasket is arranged between the stator sealing head and the heat shield cover plate, the motor, the stator sealing head and a pump shell are sequentially laminated together, one end of a main bolt is fixed on the pump shell through a thread, the motor is penetrated in the middle, and the other end of the main bolt is fixed together through the thread and a main nut. Compared with other structural heat shields: the invention adopts the structure that the heat shield and the inlet guide vane are integrated, so that the space is effectively utilized, and the structure is more compact; the heat shield cover plate and the inlet guide vane are connected together in a welding mode of two circumferential welds, so that the number of welds is small, the welding track is simple, and the structure is more reliable and safer; on the one hand, form the air heat insulating chamber in the middle of heat shield apron and the import stator, the heat-conduction of effective separation pump case side direction motor side, on the other hand, through-shaft hole upper end adopts thermal-insulated seal groove, is equipped with seal ring between stator head and the heat shield apron, forms heat convection between the effective separation pump case side of dual seal means and the motor side for thermal-insulated effect is showing more.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention
FIG. 2 is a schematic view of a heat shield according to the present invention
The specific implementation mode is as follows:
as shown in FIG. 2, a heat shield of a modular small reactor shielding type nuclear main pump, a heat shield cover plate 81 and an inlet guide vane 82 are welded and fixed together through two circumferential welds 85, an air heat insulation cavity 84 is formed between the heat shield cover plate 81 and the inlet guide vane 82, a through shaft hole 86 is arranged in the center of the inlet guide vane 82, a heat insulation sealing groove 83 is arranged at the position of the through shaft hole 86 close to the heat shield cover plate 81, the heat insulation sealing groove 83 adopts a classic labyrinth groove structure, as shown in fig. 1, the heat shield cover plate 81 and the inlet guide vane 82 are integrally fixed on the stator head 2 by the heat shield fastening bolt 3, a sealing washer 6 is arranged between the stator head 2 and the heat shield cover plate 81, the motor 1, the stator head 2 and the pump case 7 are sequentially laminated together, one end of the main bolt 4 is fixed on the pump case 7 by a thread, and the main bolt 4 penetrates through the other end of the motor 1 and is fixed with the main nut 5 by a thread.
Claims (1)
1. The utility model provides a heat shield of small-size shielding formula nuclear main pump of piling of modularization which characterized by: the heat shield cover plate (81) and the inlet guide vane (82) are welded and fixed together through two circumferential weld joints (85), an air heat insulation cavity (84) is formed between the heat shield cover plate (81) and the inlet guide vane (82), a through shaft hole (86) is formed in the center of the inlet guide vane (82), a heat insulation sealing groove (83) is arranged at the position, close to the heat shield cover plate (81), of the through shaft hole (86), the heat insulation sealing groove (83) adopts a classic labyrinth groove structure, the heat shield cover plate (81) and the inlet guide vane (82) are integrally fixed on the stator end enclosure (2) through a heat shield fastening bolt (3), a sealing gasket (6) is arranged between the stator end enclosure (2) and the heat shield cover plate (81), and the motor (1), the stator seal head (2) and the pump shell (7) are sequentially laminated together, one end of the main bolt (4) is fixed on the pump shell (7) through threads, and the main bolt (4) penetrates through the other end of the motor (1) and is fixed with the main nut (5) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549336.XA CN114352576A (en) | 2021-12-17 | 2021-12-17 | Heat shield of modular small reactor shielding type nuclear main pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549336.XA CN114352576A (en) | 2021-12-17 | 2021-12-17 | Heat shield of modular small reactor shielding type nuclear main pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114352576A true CN114352576A (en) | 2022-04-15 |
Family
ID=81098844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111549336.XA Pending CN114352576A (en) | 2021-12-17 | 2021-12-17 | Heat shield of modular small reactor shielding type nuclear main pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114352576A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0844399A1 (en) * | 1996-11-22 | 1998-05-27 | Jeumont Industrie | Thermal barrier for primary pump |
| CN104005963A (en) * | 2014-05-23 | 2014-08-27 | 哈尔滨电气动力装备有限公司 | Main pump structure for small nuclear power plant |
| CN203962425U (en) * | 2014-07-24 | 2014-11-26 | 沈阳鼓风机集团申蓝机械有限公司 | Reactor coolant pump hydraulic model |
| CN110259691A (en) * | 2019-07-24 | 2019-09-20 | 上海阿波罗智能装备科技有限公司 | A kind of rickle main pump |
-
2021
- 2021-12-17 CN CN202111549336.XA patent/CN114352576A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0844399A1 (en) * | 1996-11-22 | 1998-05-27 | Jeumont Industrie | Thermal barrier for primary pump |
| CN104005963A (en) * | 2014-05-23 | 2014-08-27 | 哈尔滨电气动力装备有限公司 | Main pump structure for small nuclear power plant |
| CN203962425U (en) * | 2014-07-24 | 2014-11-26 | 沈阳鼓风机集团申蓝机械有限公司 | Reactor coolant pump hydraulic model |
| CN110259691A (en) * | 2019-07-24 | 2019-09-20 | 上海阿波罗智能装备科技有限公司 | A kind of rickle main pump |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220415 |