CN207124037U - Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly - Google Patents
Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly Download PDFInfo
- Publication number
- CN207124037U CN207124037U CN201720381247.1U CN201720381247U CN207124037U CN 207124037 U CN207124037 U CN 207124037U CN 201720381247 U CN201720381247 U CN 201720381247U CN 207124037 U CN207124037 U CN 207124037U
- Authority
- CN
- China
- Prior art keywords
- bottom nozzle
- connecting plate
- pressure drop
- fuel assembly
- shirt rim
- 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.)
- Withdrawn - After Issue
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Classifications
-
- 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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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a kind of low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly, closing skirt edge type bottom nozzle includes connecting plate, several supporting legs and shirt rim；Several supporting leg intervals are connected to below the connecting plate, and the shirt rim is connected to below the connecting plate between the adjacent supporting leg, is enclosed together with the supporting leg below the connecting plate periphery.In the utility model, closed-loop layout of the shirt rim below connecting plate, while bottom nozzle pressure drop coefficient is reduced, there is higher intensity, improve the dimensional stability of bottom nozzle.In fuel assembly, there is provided bottom nozzle exit flow field evenly so that the flow field in bottom nozzle above fuel bundle area is more uniform, advantageously reduces the Flow vibration level of fuel rod lower end, reduces bottom nozzle pressure drop coefficient.
Description
Technical field
It the utility model is related to nuclear reactor technology field, more particularly to a kind of low pressure drop bottom nozzle, use the bottom nozzle
Fuel assembly lower component and fuel assembly.
Background technology
Current commercial presurized water reactor in-pile component is designed with Westinghouse Electric, Siemens Company, combustion enginnering company, Ba Wei companies
Four types, each type of fuel assembly lower support component (lower core plate) differ.To coordinate these four types
In-pile component, fuel assembly bottom nozzle also have four types.
The bottom nozzle of existing western room type PWR fuel assembly is connecting plate (also known as matching disc, supporting plate, adapter
Plate) the stool-type structure of four supporting legs of band, part shirt rim is carried between two supporting legs to improve intensity.Under shirt rim
The passage for fluid communication between consecutive fuel component bottom nozzle is left between two supporting legs in portion.Existing this kind of down tube
Seat can undergo sudden expansion sudden contraction process because fluid (cooling agent) is after lower core plate spray-hole enters bottom nozzle chamber, have larger
Fluid pressure loss coefficient.
Utility model content
The technical problems to be solved in the utility model is, there is provided one kind reduces bottom nozzle pressure drop coefficient, improves strong
The low pressure drop bottom nozzle of degree, fuel assembly lower component and fuel assembly using the bottom nozzle.
Technical scheme is used by the utility model solves its technical problem：A kind of low pressure drop bottom nozzle is provided, including
Connecting plate, several supporting legs and shirt rim；Several supporting leg intervals are connected to below the connecting plate, the shirt rim connection
Below the connecting plate between the adjacent supporting leg, enclosed together with the supporting leg under the connecting plate periphery
Side.
Preferably, the inner side of the shirt rim is provided with chamfered section so that the thickness of the shirt rim connects the connecting plate certainly
One end gradually increases to one end away from the connecting plate.
Preferably, the surface of the chamfered section is cambered surface, plane or streamlined face.
Preferably, it is provided with chamfering on the outside of the one end of the supporting leg and/or the shirt rim away from the connecting plate.
Preferably, bottom of the shirt rim away from the connecting plate is provided with groove portion.
Preferably, the depth of the groove portion is less than 1mm.
Preferably, the connecting plate is provided with the through hole of several through connection plate upper and lower surfaces.
The utility model also provides a kind of fuel assembly lower component, including described in lower core plate and any of the above item
Bottom nozzle；The lower core plate is provided with the spray-hole of several insertions, and the bottom nozzle is arranged in the lower core plate, and
It is covered on the spray-hole.
Preferably, the surface of the chamfered section of the bottom nozzle shirt rim smoothly connects with the medial surface of the spray-hole.
The utility model also provides a kind of fuel assembly, including bottom nozzle described in any of the above item or more any one institute
The fuel assembly lower component stated.
The beneficial effects of the utility model：Closed-loop layout of the shirt rim below connecting plate, reducing bottom nozzle pressure damage
While losing coefficient, there is higher intensity, improve the dimensional stability of bottom nozzle.In fuel assembly, there is provided evenly
Bottom nozzle exit flow field so that the flow field in bottom nozzle above fuel bundle area is more uniform, advantageously reduces fuel rod lower end
Flow vibration is horizontal, reduces bottom nozzle pressure drop coefficient.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is the structural representation of the low pressure drop bottom nozzle of the utility model first embodiment；
Fig. 2 is the polycrystalline substance schematic diagram of bottom nozzle shown in Fig. 1；
Fig. 3 is the cut-away section structural representation of the low pressure drop bottom nozzle of the utility model second embodiment；
Fig. 4 is the polycrystalline substance schematic diagram of the low pressure drop bottom nozzle of the utility model 3rd embodiment；
Fig. 5 is the cut-away section structural representation of the low pressure drop bottom nozzle of the utility model 3rd embodiment；
Fig. 6 is the structural representation of fuel assembly lower component of the present utility model；
Fig. 7 is the structural representation of the fuel assembly lower component of the embodiment of the utility model one；
Fig. 8 is the structural representation of the fuel assembly lower component of another embodiment of the utility model；
Fig. 9 is the structural representation of the fuel assembly lower component of the another embodiment of the utility model；
Figure 10 is the geometrical model figure of the CFD analyses of the utility model bottom nozzle and prior art bottom nozzle；
Figure 11 is whirlpool energy loss schematic diagram corresponding to Figure 10 bottom nozzle；
Figure 12 is Flow Field Distribution schematic diagram corresponding to Figure 10 bottom nozzle；
Figure 13 is pressure drop schematic diagram corresponding to Figure 10 bottom nozzle.
Embodiment
In order to which the technical characteristics of the utility model, purpose and effect are more clearly understood, it is detailed now to compare accompanying drawing
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, 2, the low pressure drop bottom nozzle of the utility model first embodiment, for fuel assembly, the bottom nozzle
It may include connecting plate 10, several supporting legs 11 and shirt rim 12.Several intervals of supporting leg 11 are connected to the lower section of connecting plate 10, shirt rim
12 are connected between the lower section of connecting plate 10 and adjacent supporting leg 11, are enclosed together with supporting leg 11 under the periphery of connecting plate 10
Side, the side plate 20 of the lower section of connecting plate 10 can be formed.Side plate 20 is formed such that between supporting leg 11 without passage, prevents cooling agent from existing
Circulated between consecutive fuel component bottom nozzle, reduce pressure drop.
Wherein, connecting plate 10 is provided with the through hole 30 of several upper and lower surfaces of through connection plate 10.In fuel assembly, through hole
The grafting that 30 parts are used for guide pipe positions, and a part is used to circulate for the longitudinal direction of fluid such as cooling agent.
Generally, connecting plate 10 is in quadrangle, and supporting leg 11 corresponds in four diagonal angles respectively provided with four, and it is main to hold
Load acts on, and ensures load.
A shirt rim 12 is connected between the adjacent supporting leg 11 of each two, so as to have skirt below 10 4 sides of connecting plate
Close on side 12.Several shirt rims 12 cross an inner space below connecting plate 10, are available for cooling agent to pass through.
Supporting leg 11 is more than the width of shirt rim 12 on width, plays a supporting role.
In the present embodiment, shirt rim 12 is in tabular, and width in the height direction everywhere is consistent.
As shown in figure 3, the low pressure drop bottom nozzle of the utility model second embodiment, different from above-mentioned first embodiment
It is：The inner side of shirt rim 12 is provided with chamfered section 13 so that the thickness of shirt rim 12 is from one end that connecting plate 10 is connected to away from connection
One end of plate 10 gradually increases.
The setting of chamfered section 13, for being engaged with lower core plate spray-hole, further reduce pressure drop.
The surface of chamfered section 13 can be plane, can further be optimized for cambered surface, streamlined face or other curved surfaces etc..
As shown in Figure 4,5, the low pressure drop bottom nozzle of the utility model 3rd embodiment, with above-mentioned first, second embodiment
Unlike：Bottom of the shirt rim 12 away from connecting plate 10 is provided with groove portion 14.
Groove portion 14 is the shallow slot that depth is less than 1mm so that the relative protrusion shirt rim 12 in the bottom of supporting leg 11, ensures that load passes
It is constant (bottom nozzle loading end is still in the part of supporting leg 11) to pass path, while also avoids cooling agent in consecutive fuel component bottom nozzle
Between circulate.
Further, in the present embodiment, shirt rim 12 is additionally provided with chamfering 15 on the outside of one end away from connecting plate 10.
As needed, chamfering 15 can also be provided on the outside of the one end of supporting leg 11 away from connecting plate 10, or extend to branch
On the outside of the one end of support leg 11 away from connecting plate 10, so that formed with chamfering 15 on the outside of one end of whole side plate 20.
As needed, in the bottom nozzle of first embodiment or second embodiment, on the outside of one end of shirt rim 12 and/supporting leg 11
Also chamfering can be provided with.
Low pressure drop bottom nozzle of the present utility model, it is arranged in fuel assembly in lower core plate.Supporting leg 11 is away from even
The bottom of fishplate bar 10 can be provided with alignment pin or positioning hole for installing.
As shown in Figure 6,7, fuel assembly lower component of the present utility model, including lower core plate 40 and bottom nozzle；Should
Bottom nozzle is the above-mentioned first embodiment low pressure drop bottom nozzle any into 3rd embodiment.Lower core plate 40 is provided with several
The spray-hole 41 of insertion, bottom nozzle is arranged in lower core plate 40, and is covered on spray-hole 41, so as to which spray-hole 41 is distributed
In the coverage of bottom nozzle.
Preferably, in bottom nozzle, the inner side of shirt rim 12 is provided with chamfered section 13；The surface of chamfered section 13 is interior with spray-hole 41
Side smoothly connects.
In one embodiment as shown in Figure 7, the surface of chamfered section 13 is plane.
In one embodiment as shown in Figure 8, the surface of chamfered section 13 is cambered surface.
In one embodiment as shown in Figure 9, the surface of chamfered section 13 is streamlined face.
In Fig. 7-embodiment illustrated in fig. 9, chamfered section 13 can smoothly connect with the medial surface of spray-hole 41.
Fuel assembly of the present utility model, including above-mentioned first embodiment into 3rd embodiment any bottom nozzle or on
The fuel assembly lower component stated.Fuel assembly also includes several fuel rods, grid spacer, guide pipe, upper base etc., can adopt
Realized with prior art.
By the bottom nozzle and prior art of second embodiment shown in first embodiment shown in Fig. 1 in the utility model and Fig. 3
In bottom nozzle (leaving passage between two supporting legs) be compared, it is as follows：
As shown in Figure 10, bottom nozzle, the utility model first embodiment and second of prior art are from left to right followed successively by
The geometrical model of the CFD analyses of the bottom nozzle of embodiment.
Figure 11 is whirlpool energy loss schematic diagram corresponding to tri- bottom nozzles of Figure 10, is from left to right followed successively by prior art
The bottom nozzle of bottom nozzle, the utility model first embodiment and second embodiment；It can be seen that bottom nozzle of the present utility model
Compared to existing bottom nozzle, fluid sudden expansion is reduced, so as to reduce whirlpool energy loss.
Figure 12 be three bottom nozzles corresponding to Flow Field Distribution schematic diagram, be from left to right followed successively by prior art bottom nozzle,
The bottom nozzle of the utility model first embodiment and second embodiment；It can be seen that bottom nozzle of the present utility model is compared with existing
Because whirlpool is reduced, flow field is more uniformly distributed some bottom nozzles.
As shown in figure 13, calculated and shown according to CFD, using the pressure drop of bottom nozzle in the prior art (A in such as figure) as 0 as pair
Than using the bottom nozzle (B in such as figure) of first embodiment shown in Fig. 1, pressure drop can reduce at least 1%, real using shown in Fig. 2 second
The bottom nozzle (C in such as figure) of example is applied, pressure drop can reduce at least 8%, and bottom nozzle exports, the flow field in fuel bundle area is more equal
It is even.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of low pressure drop bottom nozzle, it is characterised in that including connecting plate, several supporting legs and shirt rim；Several supports
Leg interval is connected to below the connecting plate, the shirt rim be connected to below the connecting plate and the adjacent supporting leg it
Between, enclosed together with the supporting leg below the connecting plate periphery.
2. low pressure drop bottom nozzle according to claim 1, it is characterised in that the inner side of the shirt rim is provided with chamfered section, makes
The thickness for obtaining the shirt rim gradually increases from the one end for connecting the connecting plate to one end away from the connecting plate.
3. low pressure drop bottom nozzle according to claim 2, it is characterised in that the surface of the chamfered section is cambered surface, plane
Or streamlined face.
4. low pressure drop bottom nozzle according to claim 1, it is characterised in that the supporting leg and/or the shirt rim are remote
Chamfering is provided with the outside of one end of the connecting plate.
5. low pressure drop bottom nozzle according to claim 1, it is characterised in that bottom of the shirt rim away from the connecting plate
Provided with groove portion.
6. low pressure drop bottom nozzle according to claim 5, it is characterised in that the depth of the groove portion is less than 1mm.
7. low pressure drop bottom nozzle according to claim 1, it is characterised in that the connecting plate is provided with several through connections
The through hole of plate upper and lower surface.
8. a kind of fuel assembly lower component, it is characterised in that including described in lower core plate and claim any one of 1-7
Bottom nozzle；The lower core plate is provided with the spray-hole of several insertions, and the bottom nozzle is arranged in the lower core plate, and
And it is covered on the spray-hole.
9. fuel assembly lower component according to claim 8, it is characterised in that the chamfered section of the bottom nozzle shirt rim
Surface smoothly connects with the medial surface of the spray-hole.
10. a kind of fuel assembly, it is characterised in that including the bottom nozzle or claim 8-9 described in claim any one of 1-7
Fuel assembly lower component described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720381247.1U CN207124037U (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720381247.1U CN207124037U (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207124037U true CN207124037U (en) | 2018-03-20 |
Family
ID=61614905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720381247.1U Withdrawn - After Issue CN207124037U (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207124037U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997785A (en) * | 2017-04-12 | 2017-08-01 | 岭东核电有限公司 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
| CN115458196A (en) * | 2022-10-18 | 2022-12-09 | 西安交通大学 | Flow-induced vibration experimental device and method for pressurized water reactor rod bundle fuel assembly |
| CN115458196B (en) * | 2022-10-18 | 2024-09-03 | 西安交通大学 | Pressurized water reactor rod bundle fuel assembly flow induced vibration experimental device and method |
-
2017
- 2017-04-12 CN CN201720381247.1U patent/CN207124037U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997785A (en) * | 2017-04-12 | 2017-08-01 | 岭东核电有限公司 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
| CN106997785B (en) * | 2017-04-12 | 2019-01-08 | 岭东核电有限公司 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
| CN115458196A (en) * | 2022-10-18 | 2022-12-09 | 西安交通大学 | Flow-induced vibration experimental device and method for pressurized water reactor rod bundle fuel assembly |
| CN115458196B (en) * | 2022-10-18 | 2024-09-03 | 西安交通大学 | Pressurized water reactor rod bundle fuel assembly flow induced vibration experimental device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180320 Effective date of abandoning: 20190108 |