CN207397726U - Fuel assembly and its bottom nozzle - Google Patents
Fuel assembly and its bottom nozzle Download PDFInfo
- Publication number
- CN207397726U CN207397726U CN201721270085.0U CN201721270085U CN207397726U CN 207397726 U CN207397726 U CN 207397726U CN 201721270085 U CN201721270085 U CN 201721270085U CN 207397726 U CN207397726 U CN 207397726U
- Authority
- CN
- China
- Prior art keywords
- bottom nozzle
- connecting plate
- fuel assembly
- support construction
- support
- Prior art date
- 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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Classifications
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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
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- Nozzles (AREA)
Abstract
The utility model discloses a kind of fuel assembly and its bottom nozzle, bottom nozzle includes connecting plate, several support legs and support construction；Several support leg intervals are connected to below the connecting plate, and the support construction is connected to the lower section of the connecting plate between several support legs.The utility model sets support construction on connecting plate, while reducing bottom nozzle stress, reducing bottom nozzle regional fluid pressure drop coefficient, improves the dimensional stability of bottom nozzle；By reducing bottom nozzle connecting plate stress level, slot milling is improved for hydraulic performance so that the flow field in bottom nozzle more than fuel bundle area is more uniform, and the Flow vibration for advantageously reducing fuel rod lower end is horizontal.
Description
Technical field
The utility model is related to fuel assembly for nuclear reactor technical field more particularly to a kind of fuel assembly and its down tubes
Seat.
Background technology
Existing bottom nozzle undertakes all load of fuel assembly, and passes through guide pipe junction and pass to connecting plate, passes through
Connecting plate passes to four support legs, then to lower core plate, causes local stress at connecting plate big, to intensity requirement height.
In addition, in existing bottom nozzle, because fluid (cooling agent) from lower four spray-holes of core plate enters bottom nozzle chamber
Afterwards, four fluid streams converge experience sudden expansion sudden contraction process in bottom nozzle lower part, have larger fluid pressure loss coefficient.
Utility model content
The technical problems to be solved in the utility model is, provides a kind of reduction bottom nozzle stress, reduces bottom nozzle region
Fluid pressure loss, improve bottom nozzle dimensional stability fuel assembly bottom nozzle and with the bottom nozzle fuel stack
Part.
Technical solution is used by the utility model solves its technical problem：A kind of bottom nozzle of fuel assembly is provided,
Including connecting plate, several support legs and support construction；Several support leg intervals are connected to below the connecting plate, described
Support construction is connected to the lower section of the connecting plate between several support legs.
Preferably, the support construction is continuous decussate texture or the decussate texture of interruption.
Preferably, the support construction includes one or more supporting items.
Preferably, multiple supporting items are connected or are spaced scattered.
Preferably, the longitudinal section shape of the supporting item is at least one of rectangle, trapezoidal, taper and abnormity.
Preferably, the lateral cross section shape of the supporting item is at least one of rectangle, cross, circle and abnormity.
Preferably, the bottom surface of the support construction is concordant with the bottom surface of the support leg.
Preferably, the connecting plate is equipped with the through hole of several through connection plate upper and lower surfaces；The support construction is in institute
It states and avoids the through hole below connecting plate.
Preferably, the support construction is located at the middle part of the connecting plate, and extends to the periphery of the connecting plate.
Preferably, the bottom nozzle further includes shirt rim；The shirt rim is connected to below the connecting plate and adjacent described
Between support leg.
The utility model also provides a kind of fuel assembly, including the bottom nozzle described in any of the above item.
The beneficial effects of the utility model：Support construction on connecting plate is set, bottom nozzle stress is being reduced, is reducing down tube
While seat regional fluid pressure drop coefficient, the dimensional stability of bottom nozzle is improved；By reducing bottom nozzle connecting plate stress
Level improves slot milling so that the flow field in bottom nozzle more than fuel bundle area is more uniform, advantageously reduces for hydraulic performance
The Flow vibration of fuel rod lower end is horizontal.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structure diagram of the bottom nozzle of the utility model first embodiment；
Fig. 2 is cross-sectional view of the bottom nozzle shown in Fig. 1 along line A-A；
Fig. 3 is the structure diagram of the bottom nozzle of the utility model second embodiment；
Fig. 4 is the structure diagram of the bottom nozzle of the utility model 3rd embodiment；
Fig. 5 is cross-sectional view of the bottom nozzle shown in Fig. 4 along line B-B；
Fig. 6 is the cross-sectional view of the bottom nozzle of the utility model fourth embodiment.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, it is detailed now to compare attached drawing
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, 2, the bottom nozzle of the fuel assembly of the utility model first embodiment, it may include connecting plate 10, number
A support leg 20 and support construction 30.Several intervals of support leg 20 are connected to 10 lower section of connecting plate, and support construction 30 is in several
The lower section of connecting plate 10 is connected between support leg 20.
The setting that the bottom nozzle passes through support construction 30 so that the load that bottom nozzle undertakes is transferred except through support leg 20
Outside, can also lower core plate be passed to by support construction 30, solves the problems, such as stress raisers, reduce bottom nozzle connection
10 stress level of plate improves bottom nozzle integral strength.
Wherein, it is in cross that support construction 30 is whole.The criss-cross support construction 30 is located at the middle part of connecting plate 10, and
Extend to the periphery of connecting plate 10.
In general, bottom nozzle includes four support legs 20, respectively positioned at four diagonal angles of connecting plate 10.Support construction 30 exists
10 middle part lower section of connecting plate is simultaneously extended between the adjacent support leg 20 of each two, is equally played a supporting role with support leg 20.
The bottom surface of support construction 30 is concordant with the bottom surface of support leg 20.
In the present embodiment, support construction 30 is a continuous decussate texture, by connecting plate below connecting plate 10
The space of 10 lower sections is separated into four chambers.Four chambers can under face core plate inlet four entrances, it is cold by preventing
But invalid traffic distribution of the agent between chamber can improve the assignment of traffic uniformity of bottom nozzle inlet, by preventing cooling agent
Invalid turbulent flow between chamber can reduce bottom nozzle pressure drop coefficient.
Connecting plate 10 is equipped with the through hole 11 of several 10 upper and lower surfaces of through connection plate.In fuel assembly, through hole 11 1
Part positions for the grafting of guide pipe, and a part is used to circulate for the longitudinal direction of fluid such as cooling agent.Support construction 30 is connecting
Avoid through hole 11 in 10 lower section of plate.
It is to be appreciated that the support construction 30 in the present embodiment may include one or more supporting items 31, for a branch
Support member 31, whole is in cross (in transverse direction)；For multiple supporting items 31, it is connected to form decussate texture.
The longitudinal cross-section of supporting item 31 can be it is variously-shaped, such as at least one in rectangle, trapezoidal, taper and abnormity
Kind.The lateral cross section shape of supporting item 31 can also be it is variously-shaped, as in rectangle, cross, circle and abnormity at least
It is a kind of.
Again as shown in Figure 1, in the present embodiment, the longitudinal cross-section of supporting item 31 is rectangle.
As shown in figure 3, the bottom nozzle of the fuel assembly of the utility model second embodiment, including connecting plate 10, Shuo Gezhi
Support leg 20 and support construction 30.Several intervals of support leg 20 are connected to 10 lower section of connecting plate, and support construction 30 is in several supports
The lower section of connecting plate 10 is connected between leg 20.
The present embodiment is unlike first embodiment：The longitudinal cross-section of the supporting item 31 of support construction 30 is trapezoidal.
It is to be appreciated that trapezoidal is trapezoid shown in Fig. 3 or inverted trapezoidal.
As shown in Figure 4,5, the bottom nozzle of the fuel assembly of the utility model 3rd embodiment, including connecting plate 10, several
Support leg 20 and support construction 30.Several intervals of support leg 20 are connected to 10 lower section of connecting plate, and support construction 30 is in several
The lower section of connecting plate 10 is connected between support leg 20.
In the present embodiment, support construction 30 is the decussate texture of interruption.
Specifically, which includes multiple supporting items 31, and multiple supporting items 31 are below connecting plate 10 along cross
Shape scattering device.At least one supporting item 31 is connected to the middle part of connecting plate 10, other supporting items 31 can be between support leg 20
It is connected to the periphery of connecting plate 10.
In the present embodiment, 31 lateral cross section of supporting item in the middle part of connecting plate 10 is in cross, other 31 shapes of supporting item
Shape is unlimited, and on the extending direction of cross supporting item 31, larger interruption decussate texture is formed with it.
As shown in fig. 6, the bottom nozzle of the fuel assembly of the utility model fourth embodiment, support construction 30 is the ten of interruption
Character form structure.
Support construction 30 includes multiple supporting items 31, and multiple supporting items 31 disperse to set below connecting plate 10 along cross
It puts.At least one supporting item 31 is connected to the middle part of connecting plate 10, other supporting items 31 can be connected between support leg 20
The periphery of fishplate bar 10.
Unlike 3rd embodiment：31 lateral cross section of supporting item at 10 middle part of connecting plate is rounded, others branch
31 shape of support member is unlimited, and on four extending directions of circular shaped support 31, larger interruption decussate texture is formed with it.
Further, as shown in Fig. 1,3,4, the bottom nozzle of the utility model further includes shirt rim 40.Shirt rim 40 is connected to
Between 10 lower section of fishplate bar and adjacent support leg 20.
Shirt rim 40 is set respectively backwards to the one side lower end of support construction 30, support leg 20 backwards to the one side lower end of support construction 30
There is chamfering.
In addition, in the bottom nozzle of the utility model, support construction 30, support leg 20 may be integrally formed at connecting plate 10
On, it is connected as one after can also being separately set.
The fuel assembly of the utility model, including above-mentioned first embodiment into fourth embodiment any bottom nozzle.Combustion
Material component further includes several fuel rods, grid spacer, guide pipe, upper tube socket etc., and prior art realization can be used.
The above description is only the embodiments of the present invention, and it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly used in
Other related technical areas are equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of bottom nozzle of fuel assembly, which is characterized in that including connecting plate (10), several support legs (20) and support knot
Structure (30)；The several support leg (20) intervals are connected to below the connecting plate (10), and the support construction (30) is in several
The lower section of the connecting plate (10) is connected between the support leg (20).
2. the bottom nozzle of fuel assembly according to claim 1, which is characterized in that the support construction (30) is continuous
The decussate texture of decussate texture or interruption.
3. the bottom nozzle of fuel assembly according to claim 2, which is characterized in that the support construction (30) includes one
Or multiple supporting items (31).
4. the bottom nozzle of fuel assembly according to claim 3, which is characterized in that multiple supporting items (31) are connected
Or interval is scattered.
5. the bottom nozzle of fuel assembly according to claim 3, which is characterized in that the longitudinal cross-section of the supporting item (31)
Shape is at least one of rectangle, trapezoidal, taper, streamlined；
The lateral cross section shape of the supporting item (31) is at least one of rectangle, cross, circle.
6. the bottom nozzle of fuel assembly according to claim 1, which is characterized in that the bottom surface of the support construction (30) with
The bottom surface of the support leg (20) is concordant.
7. the bottom nozzle of fuel assembly according to claim 1, which is characterized in that the connecting plate (10) is equipped with several
The through hole (11) of through connection plate (10) upper and lower surface；The support construction (30) is avoided described below the connecting plate (10)
Through hole (11).
8. the bottom nozzle of fuel assembly according to claim 1, which is characterized in that the support construction (30) is located at described
The middle part of connecting plate (10), and extend to the periphery of the connecting plate (10).
9. according to the bottom nozzle of claim 1-8 any one of them fuel assemblies, which is characterized in that the bottom nozzle further includes
Shirt rim (40)；The shirt rim (40) is connected to below the connecting plate (10) between the adjacent support leg (20).
10. a kind of fuel assembly, which is characterized in that including claim 1-9 any one of them bottom nozzles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721270085.0U CN207397726U (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721270085.0U CN207397726U (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207397726U true CN207397726U (en) | 2018-05-22 |
Family
ID=62330900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721270085.0U Active CN207397726U (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207397726U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107610786A (en) * | 2017-09-29 | 2018-01-19 | 岭东核电有限公司 | Fuel assembly and its bottom nozzle |
-
2017
- 2017-09-29 CN CN201721270085.0U patent/CN207397726U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107610786A (en) * | 2017-09-29 | 2018-01-19 | 岭东核电有限公司 | Fuel assembly and its bottom nozzle |
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